Method and device for correcting power assist torque of electric steering system and vehicle

Abstract

The invention provides a power-assisted torque correction method, device and vehicle of an electric steering system, wherein the method comprises the following steps of: firstly, collecting a steeringvoltage, a steering current, a vehicle speed and a steering wheel angle of a power-assisted motor, calculating an actual power of the power-assisted motor, and determining a theoretical power of thepower-assisted motor; calculating a power-assisted torque adjustment coefficient according to the actual power of the power-assisted motor and the theoretical power of the power-assisted motor; adjusting the actual power according to the power-assisted torque adjustment coefficient, and taking the adjusted target adjustment power as an actual power value of the power-assisted motor so as to adjuststeering characteristic curves of each vehicle speed and each steering wheel angle of the power-assisted motor. According to the power-assisted torque correction method, device and vehicle of the electric steering system, the power-assisted torque of the motor can be automatically adjusted according to a mechanical wear state of the electric steering system, the problem of over steering or insufficient steering caused by the mechanical wear of the electric steering system is avoided, the on-line continuous improvement of the steering characteristic curve can be achieved, and the good steeringfeeling of a driver is kept in the whole life cycle of the vehicle operation.

Description

technical field [0001] The invention belongs to the technical field of an electric steering system of a new energy vehicle, and in particular relates to a method, a device and a vehicle for correcting an assist torque of an electric steering system. Background technique [0002] With the rapid development of new energy vehicles, the electric steering system has been widely used. The safe and effective operation of the steering system is directly related to the safety performance and driving experience of the vehicle. Therefore, how to ensure the safety performance of the steering system to the greatest extent has become an Important aspects that must be considered during structural design and control strategy development. [0003] The schematic diagram of the existing steering system is as follows: figure 1 As shown, when the system is corrected on the vehicle for the first time, the corresponding relationship between the steering wheel angle and the steering assist torque ...

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Problems solved by technology

[0005] The object of the present invention is to provide a method, device and vehicle for correcting power assist torque of an electric steering system, which are used to solve the problem of oversteering or understeering caused by wear and tear of components of the steering system in the prior art

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