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

A technology for electric power steering and transportation vehicles, applied in the direction of vehicle steering/bump performance, etc., can solve problems such as difficult to assist torque, avoid differences in steering feel, light steering and good road feel, and improve stability and comfort. Effect

Inactive Publication Date: 2009-01-07
JIANGSU UNIV
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  • Abstract
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  • Claims
  • Application Information

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

Method used

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

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Embodiment Construction

[0044] The present invention will be further described below with reference to the drawings and embodiments. Such as Figure 4 As shown, the power assist characteristic curve diagram of the electric power steering system of the heavy transportation vehicle of the present invention.

[0045] First, in order to protect the motor from frequent starting of the motor, the initial assist steering wheel torque T is set in different speed intervals. 0 =±1Nm, T 1 =±1.5Nm, T 2 =±2Nm. The initial assist steering wheel torque increases gradually with the increase of speed, the purpose is to enhance the sense of stability pursued during high-speed steering. At the same time 0≤T d i (V i ) (i=0, 1, 2) The EPS does not work in the interval, which is also conducive to improving the energy-saving efficiency of the EPS system.

[0046] Secondly, determine the maximum assist torque of the electric motor under various working conditions. For vehicles equipped with the same type of EPS, the maximum boo...

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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 (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 the rotary 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(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 [0001] The invention relates to a method for determining the optimal boost torque of a vehicle electric power steering system, and more specifically, it relates to a method for determining the optimal boost torque of a motor of the electric power steering system of a heavy-duty transportation vehicle. Background technique [0002] With the increase in car ownership, energy and environmental issues have gradually become major obstacles to the development of the automotive 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. It does not require complicated mechanical and hydraulic controls, and is energy-saving and environmentally friendly. Many scholars have paid attention to many advantages, such as improving the handling performance of automobiles, and have become a hot spot i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M17/06
Inventor 陈龙袁朝春江浩斌李可汪若尘
Owner JIANGSU UNIV
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