Booster torquemoment determination method for heavy type transport vehicle electric power-assisted steering system

Abstract

The invention relates to an optimum determining method of power steering torque of electric power steering system of vehicle. At first, the torque of the starting power-steered steering wheel can be determined; the torques of the starting power-steered steering wheel in different speed intervals are set: T0(v0) is equal to plus or minus 1Nm; T1 (v1) is equal to plus or minus 1.5Nm; and T2(v2) is equal to plus or minus 2Nm. Secondly, the coefficient of proportionality of the starting steering power of a motor V <L>(Vi) (i is equal to 0,1 and 2) is determined, according to the operation of the vehicle (idle load of vehicle and relevant parameters of vehicle) and the effects of steering power. Thirdly, the maximum power steering torque of the motor is determined; and the torque Tdtest of therotary steering wheel of the vehicle requiring an EPS system is measured in the state of maximum load and the stationary state. Fourthly, the coefficient (M / m).V<L>(Vi) of the actual steering power is regulated according to the vehicle load, speed and requirements for the steering system. Fifthly, the optimum power steering current of the motor of the EPS system is determined, according to the whole weight M, the running speed V, the torque Td and the parameters of the steering system of the vehicle under the actual running condition.

Description

technical field The invention relates to a method for determining the optimum assisting torque of a vehicle electric power steering system, in particular to a method for determining the optimum assisting torque of a motor of an electric power steering system for a heavy-duty transport vehicle. Background technique With the increase of automobile ownership, energy, environmental protection and other issues have gradually become the main obstacles to the development of the automobile industry. Electric Power Steering System (EPS: Electric Power Steering System) is different from traditional hydraulic power steering system (HPS: Hydraulic Power Steering System) and electronically controlled hydraulic power steering system. And many advantages such as improving the handling performance of automobiles have attracted the attention of many scholars and become a hot spot in the research and development of modern automobile steering systems. One of the keys to the performance of th...

AI Technical Summary

Problems solved by technology

When the vehicle load changes greatly, the above three methods for determining the optimum current of the motor cannot change the assist coefficient K (V) of the motor to determine the optimum assist current of the motor, so it is difficult for the EPS to provide The ideal power-assisted torque ensures the driver to turn lightly and have a good sense of the road