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Method for controlling electronic power steering system of vehicle without sensor

A technology of electric power steering and steering system, applied in the direction of automatic steering control components, electric steering mechanism, steering mechanism, etc., can solve the problems of increasing output noise, affecting the driver's sense of road and control stability, etc., to achieve simplified structure, Eliminate the need for installation and debugging, and eliminate the effect of impact

Inactive Publication Date: 2010-04-07
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to increase sensitivity, the stiffness of the torsion bar is smaller than that of the steering column, which increases its output noise; in addition, it also has the problem of softening the stiffness of the steering column, which affects the driver's road feel and control stability

Method used

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  • Method for controlling electronic power steering system of vehicle without sensor
  • Method for controlling electronic power steering system of vehicle without sensor
  • Method for controlling electronic power steering system of vehicle without sensor

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Embodiment Construction

[0013] Such as figure 1 As shown, a control method of a sensorless automobile electric power steering system, the steering system includes a control unit (ECU) 1 and a booster motor 2; The state-space mathematical model executes the Kalman observer algorithm; the steering system also includes a booster motor current sensor 3, which takes the system state component of the booster motor current as the measurement input of the control unit (ECU) 1, and observes Steering column angle θ c , motor rotor angle θ m and other system state components such as rack displacement p, by formula (K c is the steering column stiffness coefficient, r p is the pinion radius) to get the steering column torque T c , thus establishing a sensorless EPS closed-loop control system to control the assist torque of the motor.

[0014] Among the figure, 4 is a steering column, 5 is a clutch and a reduction mechanism, 6 is a rack, 7 is a pinion, 8 is a wheel, and 9 is a steering wheel.

[0015] The ...

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Abstract

The invention provides an electronic power steering EPS system of a vehicle without a sensor and a control method thereof. The method comprises the following steps: 1, saving a torque sensor of a steering column, an angle sensor of the steering column and a rotor angle sensor of a booster motor in the prior electronic power steering EPS system for the vehicle; and 2, realizing control of the electronic power steering system by adopting a new control method. The torque and the turn angle of the steering column and a rotor turn angle of the booster motor, which are required for the control of the EPS system is calculated by establishing a state-space mathematical model of the electronic power steering system of the vehicle without the sensor, using current of the booster motor (state component of a system) as measurement input and observing the state components of other systems by an improved Kalman observer algorithm, and thus, the boost torque of the booster motor controlled by a closed loop control system of the EPS without the sensor is established. The method simplifies the structure and manufacturing difficulty of a steering gear box, improves the reliability of the system, reduces complexity of the EPS system and greatly reduces the cost of the EPS system.

Description

technical field [0001] The invention relates to a control method of an electric power steering system of an automobile, in particular to a control method of a sensorless electric power steering system of an automobile. Background technique [0002] Automotive electric power steering EPS system has obvious advantages over traditional hydraulic power steering systems in terms of fuel efficiency, modularization, road feel adjustability and environmental friendliness. There are currently four main types of automotive electric power steering EPS systems, namely steering column assist, pinion assist, rack assist and double pinion assist. All four of these EPS systems have three basic components: an control unit (ECU), a power assist motor, and a torque sensor and an angle sensor mounted on the steering column. In the absence of brushes, the power-assisted motor also needs a motor rotor position sensor to assist the commutation of the motor. Therefore, the existing EPS control st...

Claims

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Application Information

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IPC IPC(8): B62D5/04B62D6/00H02P6/18B62D113/00B62D119/00
Inventor 刘和平熊亮刘平张毅李果郑群英邓力
Owner CHONGQING UNIV
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