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Electric power assisted steering assembly

A technology of electric power steering and components, which is applied in the direction of electric steering mechanism, power steering mechanism, automatic steering control components, etc., and can solve the problem of the car being pulled to one side

Active Publication Date: 2012-07-18
TRW LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the suspension is misaligned, the forces on the road wheels when driving in a straight line can sometimes cause the car to be pulled to one side

Method used

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  • Electric power assisted steering assembly
  • Electric power assisted steering assembly
  • Electric power assisted steering assembly

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0047] exist figure 1An electric power steering assembly device is shown in . The device comprises an electric motor 1 acting on a drive shaft 2 via an (optional) rack and pinion gearbox. The drive shaft ends in a worm gear 4 which cooperates with a wheel provided on a part of the steering column 5 or a shaft operatively connected to the steering column. This device is such that any force applied to the steering column through the gearbox will be felt by the driver, requiring the driver to apply a constant and small corrective torque to maintain a straight line. It will be apparent that the invention according to this embodiment serves to at least partially compensate for this pulling.

[0048] The steering column carries a torque sensor 6 adapted to measure the torque carried by the steering column. This moment is generated by the driver to turn the steering wheel to turn or prevent the vehicle from being pulled to one side. The output signal T from this sensor is sent to...

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PUM

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Abstract

An electric power assisted steering assembly comprises a steering mechanism which operatively connects a steering wheel to the road wheels of a vehicle, a torque sensing means which is adapted to produce an output signal indicative of the torque applied to a portion of the steering mechanism by the driver, a signal processing means which is adapted to control the motor so as to cause the motor toapply a torque to the steering mechanism to assist the driver; and a compensation torque generating means which is adapted to combine a torque value representative of the motor applied torque with the output of the torque sensor to produce a compensation torque signal that is to be applied by the motor to the steering mechanism that at least partially compensates for any pull on the steering due to suspension misalignment.

Description

technical field [0001] The present invention relates to improvements in electric power steering assemblies in which an electric motor is adapted to apply an assisting torque to a steering component, such as a steering column, to reduce the effort required by the driver to control the vehicle. The invention also relates to a method of controlling a motor in such an assembly. Background technique [0002] In simple electric power steering systems there is a torque sensor which is arranged to measure the level of torque exerted by the driver on the steering column. From this measurement, the controller calculates the value of a torque demand signal indicative of the torque that the electric motor should apply to the steering column. The electric motor typically applies the same amount of torque as the driver needs to reduce the effort required to turn the wheels. The torque applied by the driver and the auxiliary torque act together through the gear transmission to steer the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B62D5/04B62D6/00B62D135/00
CPCB62D5/0472
Inventor B·容汉斯
Owner TRW LIMITED