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Electric power-assisted steering apparatus and control method thereof

A technology of electric power steering and controller, which is applied in the direction of automatic steering control components, electric steering mechanism, steering mechanism, etc., and can solve the problems that the power steering control function cannot be maintained, rollover accidents are prone to occur, and it is difficult to compensate for understeering and oversteering. Achieve low cost, avoid traffic accidents, and operate quickly

Inactive Publication Date: 2008-11-05
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defects in the current technology are: (1) EPS itself is difficult to compensate for understeering and oversteering (oversteering) problems caused by road surface and vehicle conditions; (2) in the case of EPS failure, it cannot maintain Power Steering Control Function
However, when the EPS system fails and cannot operate normally, it is prone to rollover accidents when turning

Method used

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  • Electric power-assisted steering apparatus and control method thereof
  • Electric power-assisted steering apparatus and control method thereof
  • Electric power-assisted steering apparatus and control method thereof

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0038] As shown in the figure, 1 is the driver, 2 is the vehicle, 3 is the electric steering gear, 4 is the required lateral speed, 5 is the assist torque, 6 is the vehicle yaw rate, 7 is the steering angle, 8 is the driver torque, 9 10 is the steering wheel, 10 is the torque sensor, 11 is the power-assisted motor, 12 is the four-wheel drive braking signal, 13 is the sensor signal, 15 is the acceleration, 16 is the control unit ECU, 17 is the torque sensor signal, and 18 is the power-assisted current.

[0039] The EPS is composed of a torque sensor 10 , a vehicle speed sensor, a current sensor, a control unit ECU 16 , an assist motor 11 , and a speed reduction mechanism. Among them, the torque sensor 10 and the rotation angle sensor are the most core sensors in the EPS. The early EPS, especially the low-speed type (which only provides power assistance ...

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Abstract

The invention relates to an electric power steering device (EPS device) and a control method for the electric power steering device, comprising a torque sensor, a vehicle speed sensor, a current sensor, an electronic control unit (ECU), a power motor and a reducing mechanism; the electric power steering device also comprises a wheel static controller which consists of a transverse swing angular speed instruction generator, a state observer, a torque distribution controller and a tyre sliding controller. The EPS device and the control arithmetic of the EPS device compensate the problems of insufficient steering or over-steering due to the road surface or vehicle conditions, ensure the precise steering of the electric power system, ensure the normal steering of the automobile when the steering power system is failed and the steering power function can not be maintained by the EPS device, and have an guarantee failure safety control function. The control method of the invention adjusts the torque of all wheels under the situation of failure of the existing EPS system or insufficient steering and over-steering, forms the vehicle steering moment, ensures the completion of the steering action, completes the EPS failure safety control, and avoids the happening of the traffic accidents. The EPS device and the control method for the EPS device have the advantages of quick operation, reliable operation, low cost, etc.

Description

technical field [0001] The invention relates to an electric power steering device and a control method thereof, in particular to a fail-safe control strategy of an electric power steering device with four-wheel brake distribution control. Background technique [0002] Electric Power Steering (EPS, Electric Power Steering) is a key component of automobile active safety, which directly affects the safety and handling stability of the vehicle 2 during operation. With the rapid development of modern automobile technology, the safety of automobile steering mechanism has gradually become the focus of research. In recent years, as people's calls for safety, environmental protection and energy saving have become higher and higher, automotive electric power steering systems, as an "on-demand" steering mechanism, have been generally favored by the industry, representing the development direction of future automotive steering technology . The defects in the current technology are: (1...

Claims

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Application Information

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IPC IPC(8): B62D6/00B62D5/04
Inventor 孙鹤旭李练兵莫红影
Owner HEBEI UNIV OF TECH
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