With electric power assist

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443
This subclass is indented under subclass 400.  Subject matter in which there is provided motive means movable by the application of electrical power (e.g., an electric servomotor) thereto to provide substantially all of the force required for guiding the vehicle, the initiating and/or remaining force being provided by a vehicle operator in guiding the vehicle.

SEE OR SEARCH THIS CLASS, SUBCLASS:

400,for detectors and sensors for steering systems where a control system is not being claimed.

SEE OR SEARCH CLASS:

318, Electricity: Motive Power Systems,   subclasses 560+ for positional servo systems (e.g., servomechanisms); and see particularly subclass 628 for "feedback" systems.


 
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Patent Number
Title
  Date
4033426 Apparatus for steering trailer vehicles Jul-5-1977
Relates to steering apparatus for trailers having pivoted wheels and towed by motor vehicles, the steering provision being a reversible electric motor carried by each such trailer. The power for the electric motor is derived from a battery or other source of electric power carried by the towing vehicle...     
4258825 Powered manlift cart Mar-31-1981
A compact powered manlift cart suitable for usage in building interiors for raising and supporting an operator at elevated heights. The cart has front and rear wheels of which one front and one rear wheel are driven by a two-speed drive motor through a chain and sprocket drive train. Power driven front...     
4522278 Torque sensor Jun-11-1985
A torque sensor generates an electric signal representing a change in the state of electromagnetic or electrostatic coupling between first and second rotors coupled together by a torsion spring. The change is caused with relative rotation of the two rotors caused by detected torque in a power assisted...     
4778022 Electric power steering system Oct-18-1988
Herein disclosed is an electric power steering system which comprises: a detecting unit for detecting the direction and magnitude of a relative angular displacement betweeen input and output shafts; and an electric motor connected to the output shaft and having its revolutions controlled through a controller...     
4856608 Power assisted vehicle steering mechanism Aug-15-1989
A power assisted vehicle steering mechanism having a rack and pinion assembly, the pinion being mounted to be displaceable by reaction with the rack on the application of steering torque, including a lever mounted for pivotal movement in response to displacement of the pinion, movement of said lever...     
4865143 Torque detecting device Sep-12-1989
A torque detecting device, which is typically used for detecting a steering torque in a motor vehicle, includes a mechanism for converting the torque applied to an input shaft to an axial force between the input shaft and an output shaft. A slider is fitted about the output shaft movably axially along...     
4865150 Power assistance vehicle steering mechanisms Sep-12-1989
In a power assisted rack and pinion vehicle steering mechanism, a rack and a pinion engage within a housing. The pinion is mounted on a pinion shaft which is journalled in bearings in a cage. A lever is fixed to the cage and projects from the cage through the housing. The lever has a part-spherical seating...     
4874053 Torque detecting apparatus Oct-17-1989
A device for detecting a load torque using angle detectors fitted with a certain spacing on a shaft which is rotated by a drive source and on the basis of a relative angular difference of angles detected by the angle detectors. The device includes two rotary drums or discs fitted with a certain spacing...     
4885517 Voice coil actuator positioning amplifier Dec-5-1989
A signal amplifier including a bridge output stage, a comparator stage arranged to control a first part of the output stage in accordance with the polarity of an input signal, and a modulating stage arranged to control a second part of the output stage in accordance with the magnitude and polarity of...     
4907668 Steering torque detecting apparatus Mar-13-1990
A steering torque detecting apparatus for use in an electrically-operated power steering system of a vehicle. Flexural load which is applied between a pair of input and output shafts during a steering operation is absorbed by the contact between a printed board and the end of a boss portion of a mounting...     
4953645 Electric wheel-chair Sep-4-1990
The electric wheel-chair comprises drive wheels on one axle group, and swivel wheels on a second axle group, with the swivel wheels being either freely pivotable or positively steerable by an engageable steering drive. The positive steering system may have either a purely electric configuration in the...     
4960178 Motor-driven power steering apparatus Oct-2-1990
A generator generates two voltage outputs which have different voltage levels. One voltage output from the generator is used for operating a power steering apparatus. Another voltage output from the generator is used for charging a battery which supplies current to other loads.
5022476 Wheelchair Jun-11-1991
A wheelchair having a pair of electrically driven drive wheels, a pair of power-operated swivel steering wheels which rotate about a vertical steering axis, and a manually-actuated lever. Each steering wheel has its own motor for adjusting the steering angle of the steering wheel. The steering lever...     
5027915 Electric power steering system Jul-2-1991
An electric power steering system includes a steering torque detecting device for detecting a steering torque applied between an input shaft connected to a steering wheel and an output shaft connected to a steering gear in response to an elastic deformation of an elastic member connecting the input shaft...     
5029659 Torque detecting apparatus Jul-9-1991
The present invention relates to a torque detecting apparatus provided with a conversion device, which is positioned on the axis of one of an input shaft and an output shaft extended on a same axis and mutually connected by a torsion bar and which serves to convert the relative rotational displacement...     
5033565 Motor-driven power steering apparatus Jul-23-1991
A generator generates two voltage outputs which have different voltage levels. One voltage output from the generator is used for operating a power steering apparatus. Another voltage output from the generator is used for charging a battery which supplies current to other loads.
5265686 Remote controlled steering mechanism Nov-30-1993
A steering mechanism for a remotely-controlled golf caddie having a drive motor coupled to a steering assembly by a non-positive coupling. The non-positive coupling between the drive motor and the steering assembly allows the steering assembly to disengage from the drive motor when the caddie runs into...     
5413187 Personal mobility vehicle May-9-1995
A personal mobility vehicle having a very low center of gravity and compact overall size which facilitates travel in narrow hallways and in negotiating sharp turns both indoors and out of doors on smooth and uneven surfaces. The vehicle includes a generally horizontally disposed frame supported in close...     
5454438 Electric power steering system Oct-3-1995
In order to provide an electric power steering system of small size whose output shaft has little play, a pressure member of the electric-driven power steering system compresses a duplex bearing, more specifically, presses two bearing components of the duplex bearing against each other. As a result,...     
5482127 Electric power steering device Jan-9-1996
A power transmission device, having a frictional face and a pressure member pressed to the frictional face, is provided between the rotary shaft of a motor and a reducing mechanism of an electric power steering device, so that the power transmission is achieved utilizing a frictional force generated...     
5511629 Motor vehicle steering system Apr-30-1996
A control appliance for a motor vehicle steering system provides automatic control intervention (or steering intervention) without corresponding movement of the steering wheel. To this end, the drive connection between the steering wheel and the steered vehicle wheels can, in effect, be separated. The...     
5517096 Power steering system May-14-1996
A power steering system includes a housing and a first member supported by the housing for movement relative to the housing. A second member is supported by the housing for movement relative to the housing and the first member. Steerable vehicle wheels are moved in response to relative movement between...     
5600559 Electric power steering apparatus Feb-4-1997
The present invention provides an electric power steering apparatus in which it is decided whether or not steering torque is in a predetermined drive inhibition area, and when the term in which the decision result is logically inconsistent with driving instruction for the motor in accordance with the...     
5664638 Sensing tilt-column steering shaft torque Sep-9-1997
A torque transducer has a circumferentially magnetized sleeve press fitted on the user-tiltable portion of a vehicle steering shaft and disposed axially intermediate the shaft support bearings. A stationary pickup coil is mounted over the sleeve and located with respect to the sleeve by a second pair...     
5699874 Electric power steering apparatus Dec-23-1997
In an electric power steering apparatus including a steering torque detector for detecting steering torque of a steering system, an electric motor for generating steering auxiliary force with respect to the steering system, and a control apparatus for controlling the steering auxiliary force generated...     
5717590 Adaptive variable assist steering control Feb-10-1998
An adaptive variable assist steering control for use in a vehicle with a steering system that provides variable assist steering responsive to a steering assist command, comprising the steps of measuring vehicle lateral acceleration periodically over a period of time, integrating a magnitude of the measured...     
5737223 Power steering apparatus Apr-7-1998
In a power steering apparatus is disclosed, in which a current control outputs a voltage to be applied to an electric motor so as to set a current flowing in an electric motor to a predetermined current value by feedback of a motor current detected by a motor current detection circuit, while a motor...     
5761627 Power-assisted steering system Jun-2-1998
A power-assisted steering system for a vehicle comprising a hydraulic motor (1) for providing vehicle steering assistance, an open center servo-valve (6) for supplying the hydraulic motor (1) with hydraulic fluid, a hydraulic pump (7) for supplying hydraulic fluid to the servo-valve (6) and to the hydraulic...     
5762160 Power steering device Jun-9-1998
A power steering device uses a control value set in accordance with a vehicle's detected steering torque to control an actuator, which generates steering assistance power. When the vehicle appears to be on a collision course with an obstacle detected in its steering direction, the control value is modified...     
5788010 Electric power steering apparatus Aug-4-1998
An electric power steering apparatus, which provides a steering assist of an electric motor directly to a vehicle steering system to reduce necessary steering power to be applied by a vehicle driver, is provided with a control unit which includes a proportion-coefficient and integration-coefficient setting...     
5805449 Vehicle motion control system Sep-8-1998
A vehicle motion control system is combined with a wheel slip control system so as to stabilize vehicle behavior during traction control during which a drive wheel cornering power varies. When the wheel slip control is in operation, a signal of a drive wheel slip is transferred from the wheel slip control...     
5810111 Electric power steering device Sep-22-1998
An electric power steering device includes an output shaft connected to a steering mechanism of a steering system for power assisting the steering operation. The EPS includes a motor and a control circuit accommodated in a common motor housing. The motor housing comprises an end frame and a cup-shaped...     
5828973 Electric power steering apparatus Oct-27-1998
An electric power steering apparatus for recovering a steering wheel to its neutral position based on the speeds of the steered wheels of a vehicle. In response to a steering torque signal from a torque sensor, assisting torque by a motor is controlled in a torque servo system from a phase compensating...     
5839537 Electric power steering control system Nov-24-1998
An electric power steering control system in which the steering "feel" is improved, having a steering force detector an electric motor for producing an auxiliary steering force, a motor current detector and a control unit for deciding the motor current value and rotational direction at least in accordance...     
5845738 vehicle control apparatus Dec-8-1998
A vehicle control apparatus includes a steering torque sensor (1) for sensing a steering torque, a motor (3) for generating a steering assisting force, a CPU (22) for determining a motor drive direction based on at least the steering force and a motor drive direction restricting circuit (25) for restricting...     
5871065 Electric power steering unit Feb-16-1999
An electric power steering unit has an armature shaft that is free from axial forces and hence may have less rigorous requirements for its strength so that it may be manufactured more efficiently at reduced cost. It comprises a rack-shaft 2 to be coupled to the guiding wheels of a vehicle, a housing...     
5878360 Electric power steering control apparatus Mar-2-1999
An electric power steering control apparatus is intended to improve the convergence and control stability of a returning motion of a steering wheel when a driver of a vehicle on which the apparatus is installed lets his or her hands free from the steering wheel, and to reduce a burden to the driver when...     
5893426 Cable-type steering device Apr-13-1999
A cable-type steering device for controlling operation of a power-steering motor in accordance with the tension on stranded metal wire cables which connect a vehicle steering wheel to a steering gearbox. Tensions of the cables are detected by contact with an arm of a potentiometer. The surfaces of the...     
5893430 Steering apparatus for automotive vehicle Apr-13-1999
A steering apparatus for an automotive vehicle having a steering shaft connected at one end thereof with a steering gear and provided at the other end thereof with a steering wheel to be rotated by steering effort applied thereto and a planetary gear set assembled with the steering shaft. The planetary...     
5899294 Electric power steering device May-4-1999
In an electric power steering device of the type wherein an input member connected to an electric motor and an output shaft including an output member connected to a steering wheel are connected via a plurality of sets of friction clutch mechanisms for transmitting an auxiliary torque from the electric...     
5904223 Electric power steering system May-18-1999
In an electric power steering system, a road surface reaction applied to a steering mechanism is estimated from a voltage and an electric current applied to an electric actuator, and a steering torque. Because the road surface reaction provides a useful data for assessing the condition of the road surface,...     
5904224 Electric power steering unit May-18-1999
An electric power steering unit includes a rack-shaft(2) to be coupled to the guiding wheels of a vehicle, a housing A for slidably containing the rack-shaft(2)and holding therein a coupling section(6)for causing the teeth of the rack-shaft(2)to engage those of a pinion arranged on the steering column(5)linked...     
5912539 Electric power steering apparatus Jun-15-1999
An electric power steering apparatus includes a judgment unit which passes a judgment that a condition, in which an offset signal indicative of the offset between a target current signal and a motor current signal, or a drive control signal used for controlling an electric motor is greater than a threshold,...     
5921344 Electric steering system Jul-13-1999
A steering assembly (10) includes a housing (28, 60) and a member (14) which is movable axially in the housing to effect turning movement of steerable wheels of a vehicle. The member (14) has a rack portion (36) for engagement with a pinion (30) and an externally threaded screw portion (40). A ball nut...     
5931250 Automatic steering apparatus Aug-3-1999
For automatic steering control by simultaneously turning a steering shaft and a steering wheel, an apparatus prevents automatic turning torque from being transmitted to the steering wheel when a driver operates the steering wheel and allows the steering wheel to turn freely. A V-shaped recess is formed...     
5984042 Electric power steering apparatus Nov-16-1999
An electric power steering apparatus comprising dead zone detecting device for detecting whether a detected value of a steering torque is no more than a predetermined value, that is, in a dead zone or not, steering angular velocity detecting device for detecting the rotation speed of a steering wheel,...     
5988310 Electric power steering control system Nov-23-1999
An electric power steering control system in which the steering "feel" is improved, having a steering force detector an electric motor for producing an auxiliary steering force, a motor current detector and a control unit for deciding the motor current value and rotational direction at least in accordance...     
5992557 Electric power steering apparatus Nov-30-1999
An electric power steering apparatus includes a steering assist torque control system in which a steering torque signal is input and a motor speed signal is output. The control system includes a main control value setting section having a gain KTT and setting a target assist torque value corresponding...     
6012347 Power steering apparatus Jan-11-2000
In conventional power steering apparatus, a motor and a reducing device of this motor were set in a laterally projecting state with respect to the steering axis, which posed a problem of poor mountability. Harmonic drive reducer, which is composed of wave generator, flexspline, and circular spline, and...     
6012730 Cable-type steering device Jan-11-2000
A cable-type steering device is provided in which a sterring wheel and a gear box are connected to each other by wires, wherein a pulley to which wires are connected can be easily assembled to housings, while maintaining the enire length of the wire at a necessary minimum. A housing is divided into a...     
6026926 Electric power steering apparatus Feb-22-2000
A control unit of an electric power steering apparatus has an overload preventing part having the function of decreasing the current supplied to a motor of the electric power steering apparatus when a state such that a steering torque acting on the steering system is above a predetermined value and the...     
6029767 Electric power steering system Feb-29-2000
When a motor terminal voltage detector circuit fails, it is impossible to calculate a motor angular speed estimate, so a current is supplied to a steering-assist motor regardless of a driver's steering state, thus leading to abnormality in control of the steering force due to an electric power steering...     
6032091 Electric power steering apparatus Feb-29-2000
An electric power steering apparatus having a control unit for controlling a motor for applying an assist torque to a steering system on the basis of a steering torque of the steering system. The control unit has a drive signal fading part for generating a drive current signal on the basis of a deviation...     
6041884 Electric power steering apparatus Mar-28-2000
An electric power steering apparatus comprises a motor for applying an auxiliary torque to a steering system, a steering torque sensor for detecting a steering torque in the steering system and a control unit for drive-controlling the motor based on at least a steering torque signal from the steering...     
6041886 Rear-wheel steering system Mar-28-2000
A rear-wheel steering system designed to reduce noise to a minimum at a low cost. The rear-wheel steering system includes an electric motor for generating a rotational force, a nut member connected to the electric motor and rotated thereby, and a rod having both ends connected to rear wheels of a vehicle...     
6044723 Electric power assisting steering apparatus Apr-4-2000
An electric power assisting steering apparatus comprises a housing, a motor mounted on the housing to generate auxiliary steering power in a rotating shaft, an output shaft to transmit the steering power for steering the wheels, a bearing for supporting the output shaft to be freely rotatable, and a...     
6070692 Electric power steering control system Jun-6-2000
An electric power steering control system in which the steering "feel" is improved, having a steering force detector an electric motor for producing an auxiliary steering force, a motor current detector and a control unit for deciding the motor current value and rotational direction at least in accordance...     
6087943 Steering alert system Jul-11-2000
An alert system for providing an alarm is disclosed. The system includes a vehicle having a steering wheel with a steering column, the steering column having an exterior surface. Marks are provided on the exterior surface of the steering column. A sensor is positioned adjacent to the marks to sense the...     
6091214 Electric power steering apparatus Jul-18-2000
An electric power steering apparatus comprises a control unit for drive-controlling a motor to apply an assist torque to a steering system based on signals from various sensors. The control unit comprises a slip angle difference predicting section for predicting a difference between a slip angle of front...     
6102151 Electric power steering apparatus Aug-15-2000
Variable gear ratio mechanism variably sets a ratio defining a pivot angle of steered wheels of the vehicle to a steering angle of a steering wheel of the vehicle. Electric motor applies an electric steering assist to the steering system of the vehicle. Steering torque sensor detects steering torque...     
6107716 Power-assisted steering assemblies Aug-22-2000
A housing assembly for an electrical device (such as an electronic circuit) is disclosed in which a support member is provided in a compartment to physically divide a componentry sensitive to such radiation. In a preferred embodiment, an electric power-assisted steering system is disclosed of the kind...     
6108599 Vehicle steering control system Aug-22-2000
In a vehicle steering control system, a manual steering input is assisted by a powered actuating steering torque which is given by K(.gamma.-t.sub.d .multidot.d .gamma./dt), where y is a detected yaw rate, K and t.sub.d are coefficients which depend on a vehicle speed, and d/dt denotes a time derivative....     
6112845 Reactive steering control system Sep-5-2000
In a steering system which produces a reactive steering assist torque which tends to cancel any unintended or undesired behavior of the vehicle, the relationship between the steering angle and the vehicle behavior such as the yaw rate and the lateral acceleration reverses in sense depending on the traveling...     
6112846 Electric power steering apparatus Sep-5-2000
An electric power steering apparatus includes a proportional plus integral control section incorporated in a control unit for achieving proportional plus integral control action of an offset between a target motor current to be supplied to an electric motor and a motor current actually flowing in the...     
6116371 Cable steering device Sep-12-2000
A cable steering device is provided such that it can be easily and reliably confirmed whether an inner cable of a Bowden cable is precisely wound around a pulley housed in a housing. Two inner cables are wound around a helical groove defined in an outer peripheral surface of a driven pulley connected...     
6116372 Electric power steering apparatus Sep-12-2000
Steering torque sensor detects steering torque manually applied to the vehicle's steering system. Control unit sets a target motor current corresponding at least to the steering torque detected by the steering torque sensor and has a plurality of steering assist modes to which are allocated different...     
6129172 Electric power steering apparatus Oct-10-2000
An electric power steering apparatus is disclosed in which steering return control is maintained when vehicle speed reaches a predetermined vehicle speed range after the vehicle speed has been lower than the speed range, and steering return control is disabled when the vehicle speed reaches the predetermined...     
6131692 Electric power steering controller Oct-17-2000
An electric power steering controller which, when an assist command signal is absent or a PWM signal is off according to the assist command signal, keeps a steering wheel position without affecting on the steering operation even if an external force is applied to tires thereby improving steering operability....     
6131693 Electric power steering apparatus Oct-17-2000
An electric power steering apparatus includes a control unit designed to be responsive to acceleration and deceleration of the vehicle and forward and revere movements of the vehicle for correcting a steering assist torque to be supplied from an electric motor to the steering system of a vehicle. The...     
6135233 Steering apparatus for vehicle Oct-24-2000
A detection value from an absolute position sensor is stored immediately before turning off of an ignition switch and is compared with a detection value of the absolute position sensor at the turning on of the ignition switch. A driving motor is actuated based on detected deviation between the two detection...     
6148949 Electric power steering apparatus Nov-21-2000
Electric power steering apparatus includes a control unit for setting a motor control signal to control operation of an electric power assisting motor on the basis of at least steering torque detected by a steering torque sensor and a vehicle velocity detected by a vehicle velocity sensor. The control...     
6148977 Free-wheel clutch Nov-21-2000
Known free-wheel clutches are directionally operated clutches, which permit a shaft (12) and a hub (16) to carry each other along in one relative direction of rotation, for example by means of frictional connection. From time to time it is desired, on the one hand, to permit free-wheeling in both directions...     
6152255 Electric power steering apparatus Nov-28-2000
An electric power steering apparatus includes a control unit for controlling a steering assist from an electric motor in accordance with steering torque detected by a torque detector. The control unit includes a plurality of assist mode generators to which are allocated respective target motor current...     
6161645 Cable steering device Dec-19-2000
A cable steering device in which the steering torque of a steering wheel is transmitted to wheels by a driven pulley provided in a driven pulley housing, cables, a follower pulley provided in a follower pulley housing and a gear box, and a power steering motor for assisting in the generation of the steering...     
6164407 Electric power steering apparatus Dec-26-2000
A vehicle steering apparatus (10) for turning steerable wheels (44) of a vehicle comprises a manually rotatable input member (12) to which steering torque is applied, an output member (34) rotatable to effect turning of the steerable wheels (44) of the vehicle, and an electric motor (102) for providing...     
6179083 Steering apparatus for vehicle Jan-30-2001
A planetary gear mechanism is constructed of sun gear, planetary gears, and ring gear. The planetary gears are fixed to a carrier integral with an input shaft. The output shaft is coupled to the ring gear. The transmission ratio can be changed by rotating the sun gear through the worm wheel and worm...     
6198992 Override for guidance control system Mar-6-2001
A method and apparatus which overrides a guidance control system so as to disengage the automatic steering control feature when an emergency condition is determined to exist. A sensor is coupled to the steering system which detects movement of the steering wheel. When movement of the steering wheel is...     
6199654 Vehicle steering apparatus Mar-13-2001
In a vehicle steering apparatus having a variable gear ratio unit arranged midway along a steering transmission system for connecting a steering wheel and tires to change the transmission ratio, and an ECU for variably controlling the variable gear ratio unit in accordance with the state of a vehicle,...     
6212453 Vehicle steering control system Apr-3-2001
A system for controlling steering of a vehicle, including an electric motor used for power-steering torque assist control. In the system, the lane-keeping-steering assist torque TLK for causing the vehicle to run along the center of a road existing ahead of the vehicle is calculated, while the power-steering...     
6223852 Electric power steering apparatus May-1-2001
An electric power steering apparatus for a vehicle includes a protection circuit for stopping operation of an electric motor provided to apply a steering assist force to a steering system of the vehicle. The protection circuit is operable to stop operation of the electric motor when an ignition off signal...     
6226580 Electric power steering apparatus May-1-2001
Control unit in an electric power steering apparatus includes a motor drive inhibition section for inhibiting output of a motor control signal on the basis of at least a steering torque signal supplied from a steering torque sensor. The control unit also includes a zero-value setting section for, when...     
6227064 Power steering apparatus May-8-2001
A power steering apparatus is furnished with a rotary cylinder supported by restraining the movement in the axial direction and rotating coaxially with a steering shaft by the transmission of movement from the motor, a feed ring fixed in the rotary cylinder with eccentricity by a predetermined angle...     
6237713 Electric power steering unit May-29-2001
A power steering unit according to the invention scarcely transmits sounds and vibrations coming from the electric motor to the steering wheel of a motor vehicle. It comprises a rack-shaft 2 to be coupled to the guiding wheels of a vehicle, a housing A for slidably containing the rack-shaft 2 and holding...     
6240349 Electric power steering apparatus May-29-2001
An electric power steering apparatus for assisting steering based on an output of a torque sensor which detects a steering torque, the apparatus cumulates the outputs at each detection for a predetermined period of time, then compares the cumulated value with a predetermined value, and detects a displacement...     
6244373 Steering control apparatus for vehicle Jun-12-2001
Target rotational speed of servo motor 31 is set based on steering speed .theta.hv detected by steering speed sensor and transmission ratio G set according to a running condition, and speed of servo motor is controlled so that rotational speed .theta.pv of servo motor detected by rotational speed sensor...     
6244374 Electrically operated power steering device Jun-12-2001
In an electrically operated power steering device wherein a rotational shaft of an electric motor is rotationally driven so as to apply a steering assist force to a steering shaft, a stator of the electric motor is provided with teeth portions composed of electromagnetic steel plates, coils wound around...     
6246197 Electric power steering controller Jun-12-2001
To estimate the rotation speed of the motor for assisting a steering torque regardless of the running state of a vehicle with accuracy, an application voltage estimation value obtained by subtracting a correction voltage obtained based on a detection current value detected by current detection means...     
6260654 Frictional transmission Jul-17-2001
A frictional transmission comprises first and second rotary shafts arranged in directions in which the central axes thereof crossed each other, a roller supported coaxially with the first rotary shaft for rotating with the first rotary shaft, a first frictional surface provided on the roller coaxially...     
6262547 Motor-driven power steering apparatus Jul-17-2001
A motor-driven power steering apparatus comprises: a torque sensor for detecting a steering torque; an assist indicator for outputting an indication signal which indicates the direction and magnitude of an output torque of a motor power-assisting a steering mechanism; a dither signal generator for outputting...     
6272410 Electric power steering system Aug-7-2001
To keep low the cross frequency of current feedback control and provide a good steering feeling, a first operation expression is selected when a difference .xi. between a current instruction value computed based on a steering state of a steering wheel and a traveling state of a vehicle and a motor drive...     
6275754 Automatic steering system for vehicle Aug-14-2001
An automatic steering system for a vehicle is provided which includes a memory section for storing data for a steering angle of a wheel with respect to a distance of movement of a vehicle in correspondence to four parking modes. If a desired parking mode is selected by a mode selecting switch and the...     
6285936 Steering system for a vehicle Sep-4-2001
A steering system for vehicles can be operated in a normal mode, in which a steering handle actuated by the driver and steered vehicle wheels are connected to one another via a control system, and in an emergency mode, in which the steering handle and the steered vehicle wheels are positively coupled....     
6326753 Controller of electric power-steering system Dec-4-2001
A controller of an electric power steering system corrects a motor current command value by using a temperature of a motor, and compensates a variation in a motor current characteristic in accordance with a variation in the temperature. The controller includes a torque sensor for detecting a steering...     
6328128 Electric power steering apparatus Dec-11-2001
An electric power steering apparatus has a torque sensor which, if the torsion of a torsion bar is within a predetermined angle, linearly outputs a detection signal converted by a first conversion ratio with respect to the torsion, and if the torsion has exceeded the predetermined angle and is within...     
6332506 Motor driven power steering device Dec-25-2001
An electric power steering apparatus includes a motor 1 which produces an auxiliary steering force in accordance with, for example, a steering torque detected by a torque sensor 7; a motor drive circuit 2 which controllably drives the motor 1; a power supply voltage detecting circuit 17 which detects...     
6338013 Multifunctional mobile appliance Jan-8-2002
The invention is a multifunctional, mobile appliance capable of performing a variety of tasks safely, quietly, without pollution, and out of sight of its owner. Such tasks might include lawn mowing, fertilizing, and edging, floor vacuuming, waxing, and polishing, or rug shampooing. In its preferred implementation,...     
6349789 Steering device for vehicles Feb-26-2002
A steering device for vehicles transmits steering torque applied by the driver to wheels. When at least one of braking force and driving force of the wheels is controlled for stabilization of vehicle behavior, steering torque is controlled to cancel out change in the steering torque due to the stabilization...     
6351050 Electrical power assisted steering systems Feb-26-2002
An electric motor of the brushless type is disclosed which is so constructed and arranged as to provide a low braking torque. An electric power steering system incorporating such a motor is also disclosed. In a preferred arrangement, the motor comprises an interior permanent magnet motor. An advantage...     
6364050 Electrical power assisted steering assemblies Apr-2-2002
In an electric power assisted steering system, the output signal from a motor position sensor (9) comprising a number of Hall effect devices (A,B,C) or the like is combined with an index signal from a sensor (108) connected to the steering column shaft (1) or the rack (6) or a yaw sensor or other angular...     
6366842 Power steering apparatus Apr-2-2002
A motor is stopped when a steering angular speed is not greater than a stop threshold VS and a motor electric current value Im is kept within a motor stop range .DELTA.I for a predetermined time period. The value of a steering torque increases as the motor electric current value Im increases. Therefore,...     
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