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| Number | Title | Issue Date |
| 8074763 | Power assist steering system The present invention provides a power assist steering system for use with a motor vehicle utilizing a torque sensor and an electronically controlled hydraulic valve used to supply or meter hydraulic fluid to a hydraulic cylinder that provides power assist to the st... | 12/13/2011 |
| 7913800 | Steering system with variable flow rate amplification ratio and associated method A steering system has a steering control unit and a ratio adjuster for varying a flow rate amplification ratio of the steering control unit. ... | 03/29/2011 |
| 7905316 | Clutch device of oil pump in power steering system A clutch device of an oil pump in a power steering system includes a pulley shaft coupled with a pulley connected with a crankshaft of an engine via a belt, a body shaft coupled with a rotor rotatably installed in a pump body and provided with a vein, clutch plates ... | 03/15/2011 |
| 7832523 | Power assist steering system The present invention provides a power assist steering system for use with a motor vehicle utilizing a torque sensor and an electronically controlled hydraulic valve used to supply or meter hydraulic fluid to a hydraulic cylinder that provides power assist to the st... | 11/16/2010 |
| 7743873 | Variable rack stroke system for vehicle A variable rack stroke system includes a rack housing in which a rack bar is slidably disposed, a casing attached to the rack housing, an annular rotary member, an annular stationary member, and a switch. The annular rotary member includes grooves on an inner periph... | 06/29/2010 |
| 7717224 | Power steering device for four-wheel drive vehicle The present invention offers a power steering device for a four-wheel drive, which includes: a first self-aligning torque estimation unit for estimating a self-aligning torque generated in a current vehicle behavior as a first self-aligning torque; a second self-ali... | 05/18/2010 |
| 7487856 | Electrically actuated, hydraulic power steering system An electrically actuated, hydraulic power steering system is provided. The steering system includes a hydraulic pump for generating hydraulic pressure, a hydraulic fluid reservoir, a hydraulic cylinder, and a control valve arrangement that selectively connects the h... | 02/10/2009 |
| 7438154 | Automotive steering rack stroke adjusting device An automotive steering rack stroke adjusting device is disclosed that detects a change in a gap defined between steerable wheels and a vehicle body depending on a change in the stroke of the steerable wheels using a vehicle height sensor, and automatically adjusts t... | 10/21/2008 |
| 7434653 | On-demand electro-hydraulic steering system A hydraulic steering system for a work machine may include a first steering actuator having a first and a second chamber. In addition, the steering system may include a second steering actuator having a third and a fourth chamber. A multi-position directional valve ... | 10/14/2008 |
| 7434654 | Electric preload for variable effort steering system A power steering system for a vehicle includes a hydraulic system for controlling resistance of a steering wheel. A valve of the hydraulic system is connected to a coil which varies positioning of the valve. A method for controlling the resistance of the steering wh... | 10/14/2008 |
| 7426977 | Vehicle power steering system A first vehicle power steering system includes a twistable steering torsion bar, a magnet, a Hall sensor, and a valve. The steering torsion bar has a first end fixedly connected to a vehicle steering wheel. The magnet is movable in a first and an opposite second lon... | 09/23/2008 |
| 7392878 | Vehicle steering control system A vehicle steering control system is provided with a steering angle ratio varying mechanism, a variable power assisted steering mechanism and a steering angle ratio controller. The steering angle ratio varying mechanism varies the steering angle ratio, which is the ... | 07/01/2008 |
| 7389848 | Hydraulic power steering assistant The invention generally relates to an improvement of conventional Hydraulically Power Assisted Steering system (HPAS-system) arranged to supply a steering assist force to the steering assembly of a vehicle as a response to a torque applied by a driver to the steerin... | 06/24/2008 |
| 7389849 | Steering apparatus with plural motors An apparatus (10) for use in turning steerable vehicle wheels (12, 14) includes first and second piston and cylinder type hydraulic motors (32, 34) which are connected with a central portion of a vehicle. A steering control valve (24) is ... | 06/24/2008 |
| 7383111 | Steering apparatus A steering apparatus for a vehicle includes a steering angle measuring unit, a vehicle speed measuring unit, a yaw rate measuring unit, a yaw rate-based reaction force control unit for controlling a steering reaction force depending on an actual yaw rate measured by... | 06/03/2008 |
| 7364006 | Steering system with leads and pulls compensation A power assist steering system including a valve housing and a proportional control valve supported within the valve housing, further includes a pressure transducer arranged with respect to the proportional control valve for determining an amount of actuation of the... | 04/29/2008 |
| 7364004 | Apparatus for use in turning steerable vehicle wheels An apparatus (10) for use in turning steerable vehicle wheels (14, 16) includes a hydraulic power steering motor (12). A pump (26) is operable to supply hydraulic fluid to the power steering motor (12). A gearset (50) is con... | 04/29/2008 |
| 7357215 | Steering apparatus for electric industrial vehicle A controller controls right and left wheel drive motors based on a tire angle detected by a tire angle sensor such that the angular velocities of a pair of drive wheels about the center of a turn of the vehicle are equal to each other. The controller determines a st... | 04/15/2008 |
| 7337873 | Steering control apparatus for a vehicle A steering control apparatus is provided for controlling a steered wheel angle of a wheel to be steered. On the basis of a road coefficient of friction estimated between right and left wheels, a braking force difference between the right and left wheels is calculate... | 03/04/2008 |
| 7325645 | Power steering device A first fluid passage extends from a first outlet/inlet port of a hydraulic pump to a first work chamber of a power cylinder, and a second fluid passage extends from a second outlet/inlet port of the pump to a second work chamber of the power cylinder. A switch syst... | 02/05/2008 |
| 7306070 | Variable gear ratio hydraulic power steering device A variable gear ratio hydraulic power steering device 1 is provided with a variable ratio transmission mechanism 7 for varying the rotation transmission ratio between the rotational angle of a steering handle 31 and the rotational angle of a pin... | 12/11/2007 |
| 7295906 | Vehicle stability control device A vehicle stability control device for reducing and/or canceling a yaw moment owing to the imbalance in longitudinal forces between the left and right wheels of the vehicle by automatically steering wheels. The control device estimates a longitudinal force differenc... | 11/13/2007 |
| 7278512 | Variable gear ratio hydraulic power steering device A variable gear ratio hydraulic power steering device 1 is provided with a variable ratio transmission mechanism 7 having a drive motor 70; a flow volume control valve 41 for controlling the discharge flow volume of an oil pump 10 ... | 10/09/2007 |
| 7264080 | Electric preload for variable effort steering system The invention provides a method for controlling valve stiffness in a power steering system. The method includes the step of engaging a pinion and a spool shaft with respect to one another for turning at least two wheels of a vehicle in response to rotation of a stee... | 09/04/2007 |
| 7245289 | Force-applying input device A force-applying input device includes a mechanical section including a tilting lever; an operation section mounted to an end of the tilting lever; first and second actuators which apply a force to the operation section through the tilting lever; first and second po... | 07/17/2007 |
| 7240760 | Steering apparatus A vehicle steering apparatus (10) includes a steering gear assembly (20) which is connected with a steerable vehicle wheel (12). A first sensor (26) has an output signal which is a function of steering wheel position. A second sensor (... | 07/10/2007 |
| 7231940 | Control valve for a hydraulic power steering system A control valve for a hydraulic power steering system includes a pair of flow circuits arranged in parallel. Each flow circuit includes an upstream and downstream flow orifices arranged in series. Each set of orifices defines between the orifices an intermediate pre... | 06/19/2007 |
| 7232007 | Method for operating a power-assisted hydraulic steering system in a motor vehicle A method of operating a power-assisted hydraulic steering system of a motor vehicle having a hydraulic pump mechanically driven by a vehicle drive assembly, and having an additional function which reduces the amount of power assistance at a high driving speed in com... | 06/19/2007 |
| 7213676 | Power steering system In a power steering system employing a power cylinder for steering assistance, hydraulic pressure is supplied through a pair of fluid lines to respective hydraulic chambers of the power cylinder. Check valves are provided to charge a hydraulic pressure in a communic... | 05/08/2007 |
| 7210554 | Power steering system A power steering system includes a hydraulic power cylinder, a hydraulic pump for supplying an oil pressure to the hydraulic power cylinder, an electric motor for driving the hydraulic pump, a first detector for detecting a steering assist force to be applied to a s... | 05/01/2007 |
| 7199549 | Feedback parameter estimation for electric machines A method and system for estimating a parameter of an electric machine, including a controller and a switching device, the controller executes a parameter estimation process, which is responsive to at least one of: a current value and a torque command and the resulta... | 04/03/2007 |
| 7185576 | Hydraulic servo-steering valve with steering moment superimposition A servo-steering valve for a hydraulic servo-steering arrangement has an input shaft, an output shaft, a torsion rod which biases the input shaft and the output shaft relative to each other into a central position, and a valve which consists of a valve sleeve and a ... | 03/06/2007 |
| 7184869 | Electric vehicle steering/drive control method In steering control for individually controlling wheel steering angles α1, α2, α3, and α4 of a vehicle in accordance with a condition equation for forming a prescribed mode, one of the condition equation variables is u... | 02/27/2007 |
| 7174825 | Hydraulic power steering apparatus In a hydraulic power steering apparatus, when the relative rotation between input and output shafts which are connected by a torsion bar is converted into the relative rotation between an outer valve element and an inner valve element, the ratio of the relative rota... | 02/13/2007 |
| 7174988 | Power steering system A power steering system includes a reversible-type oil pump supplying hydraulic fluid to first and second pressure chambers of a hydraulic power cylinder through first and second passages and having first and second discharge ports, and a branch passage conveying pa... | 02/13/2007 |
| 7168520 | Power-assisted steering system of an automobile A servo-assisted steering system for a motor vehicle, in which the steering system includes a steering wheel for presetting a desired steering angle for the wheels of the motor vehicle, a driving-dynamics means for superimposing a correction angle on the steering an... | 01/30/2007 |
| 7164978 | Vehicle electro-hydraulic power steering unit A vehicle electro-hydraulic power steering unit includes: a steering mechanism steering a steering wheel in a steering direction; an electro-hydraulic pump; a piston mechanism assisting the steering mechanism in a steering direction; a hydraulic circuit causing an a... | 01/16/2007 |
| 7161323 | Motor drive apparatus, electric actuator and electric power steering apparatus The disclosure concerns a a motor drive apparatus, an electric actuator and an electric power steering apparatus capable of continuous torque control up to the high drive speed and high torque area, in order to enable quick acceleration and deceleration. A controlle... | 01/09/2007 |
| 7157878 | Transient compensation voltage estimation for feedforward sinusoidal brushless motor control A method for controlling a voltage mode controlled electric machine comprising: receiving a torque value representative of a desired torque; obtaining a speed value indicative of a rotational velocity of the electric machine; acquiring a phase advance value indicati... | 01/02/2007 |
| 7155906 | Power steering system In a hydraulic power steering system employing a power cylinder accommodating therein a piston connected to a steering mechanism for steering assistance, and having first and second hydraulic chambers defined on both sides of the piston, hydraulic pressure is suppli... | 01/02/2007 |
