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Method and system for suppressing steering torque fluctuation for EPS

A steering torque and fluctuation compensation technology, which is applied to steering mechanisms, electric steering mechanisms, power steering mechanisms, etc., can solve problems that affect the driver's driving experience, and achieve the effects of improving quality, suppressing torque fluctuations, and weakening steering torque fluctuations

Active Publication Date: 2021-11-02
YUBEI XINXIANG POWER STEERING SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the first reason is that the fluctuation caused by the mechanical transmission mechanism can cause the fluctuation of the steering hand force, which leads to the fluctuation of the hand force of the slow steering wheel; the second reason is the steering torque caused by the motor output torque fluctuation caused by the motor cogging torque, etc. fluctuation
This fluctuation can affect the hand force of the driver operating the steering wheel through the reduction mechanism of the EPS, so that the driver can feel the torque fluctuation during the steering process, which is more obvious when the steering wheel is operated at a slow speed, which affects the driving experience of the driver.

Method used

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  • Method and system for suppressing steering torque fluctuation for EPS
  • Method and system for suppressing steering torque fluctuation for EPS
  • Method and system for suppressing steering torque fluctuation for EPS

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0040] A method for suppressing fluctuations in steering torque for EPS, such as figure 1 shown, including the following steps:

[0041] Step 1: extract the higher harmonic components of the steering torque;

[0042] Step 2: Calculate the torque fluctuation compensation current according to the higher harmonic component, and multiply the higher harmonic component by a compensation gain to obtain the torque fluctuation compensation current.

[0043] Wherein, the step 1 includes the following steps:

[0044] Step 1.1: collect the angle signal output by the steering wheel at a fixed spatial interval through the rotor position sensor, and use it as a trigger signal;

[0045] Step 1.2: collecting and filtering the steering torque signal according to the trigger signal, so as to obtain the high-order harmonic component.

[0046] In the step 1.2, the steering torque signal is filtered by a harmonic filter, wherein the steering torque signal is a digital signal collected and conver...

no. 2 example

[0088] Other technical features In the same situation as the first embodiment, step 1.1: collect the continuous angle signal of the steering wheel through the rotor position sensor;

[0089] Step 1.2: collecting steering torque signals at fixed time intervals and filtering through a second digital filter;

[0090] Wherein, the second filter is realized by the following formula:

[0091]

[0092] Among them, Y(k)——the output result of this filter;

[0093] Y(k-1)——the output result of the filter last time;

[0094] U(k)——the input of the filter this time;

[0095] U(k-1)——the last input of the filter;

[0096] ω s - the "cut-off harmonic order" of the harmonic filter;

[0097] T s =ΔA / 360, ΔA is the angle difference between two samplings.

[0098] In addition, similar to the definition of the time-domain signal sampling period, the angle-domain sampling period can be defined as the angle difference between two signal samples, that is, the period is the number of signa...

no. 3 example

[0100] A system for suppressing fluctuations in steering torque for EPS such as figure 2 As shown, it includes a harmonic filter, a compensation gain calculation module and a compensation current calculation module, wherein the harmonic filter is used to extract the high-order harmonic components of the steering torque, and transmit the high-order harmonic components to the The compensation current calculation module; the compensation gain calculation module determines the compensation gain in the current state according to the vehicle speed signal and the steering torque signal, and transmits the compensation gain to the compensation current calculation module; the compensation current calculation module according to The current high-order harmonic component and compensation gain are used to calculate the current torque fluctuation compensation current.

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Abstract

The invention provides a method and a system for suppressing steering torque fluctuation for EPS (electric power steering). The method comprises the following steps: step 1, extracting higher harmonic components of steering torque; and step 2, calculating torque fluctuation compensation current according to the higher harmonic component. The magnitude of the higher harmonic components of the steering torque is calculated, and the corresponding torque fluctuation compensation current is calculated to compensate power-assisted current, so that the effect of weakening the steering torque fluctuation is achieved; and the method can effectively restrain torque fluctuation in the steering process, and helps to improve the quality feeling of the vehicle.

Description

technical field [0001] The invention relates to the technical field of automotive electronics, in particular to a method and system for suppressing steering torque fluctuations for EPS. Background technique [0002] EPS is an electric power steering system used in automobiles. It can control the power-assisted motor to output corresponding torque according to the driver's hand force on the steering wheel and the speed of the vehicle. The motor torque is amplified by the deceleration mechanism and the driver's hand force to complete the steering operation of the vehicle, reducing the difficulty of the driver's operation of the vehicle. [0003] In the process of EPS boosting, there are two reasons that will cause the output torque of the motor to fluctuate during one revolution, and the steering wheel is turned slowly (such as the speed of operating the steering wheel <10° / S, that is, turning the steering wheel at a speed of half a minute) At this time, the fluctuation of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D5/04
CPCB62D5/046Y02T10/72
Inventor 姚坤鹏张金萍娄亚飞王志远
Owner YUBEI XINXIANG POWER STEERING SYST
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