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Control strategy for motor of electric assisted steering system

一种电动助力转向、控制策略的技术，应用在电子换向电动机控制、电动发电机控制、电动转向机构等方向，能够解决电压降低、增大电流要求等问题

Active Publication Date: 2015-09-09
TRW LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the battery is partially or completely drained or may be disconnected, the sudden increase in current demand may not be met causing a voltage drop until the alternator only responds to changes in battery voltage

Method used

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  • Control strategy for motor of electric assisted steering system
  • Control strategy for motor of electric assisted steering system
  • Control strategy for motor of electric assisted steering system

Examples

Experimental program
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Effect test

Embodiment Construction

[0048] Such as figure 1 As shown in , the vehicle is provided with an Electric Power Assisted Steering (EPAS) system which draws current i from the vehicle power supply via the conductor rail 2 battery . The power source comprises a battery 3 , typically rated at 12 volts DC, which in turn is charged by an alternator 4 . The battery also supplies current to other vehicle accessories 5 .

[0049] in the attached figure 2 EPAS system 1 is schematically shown in . It comprises: a steering column 10 , which is attached to a steering wheel 11 ; a torque sensor 12 , which measures the torque applied to the steering column 10 by the driver when he turns the steering wheel; a motor control and drive circuit 13 and an electric motor 14 .

[0050] A torque sensor 12 may be attached to a quill shaft in series with the column 10 and an electric motor 14 may act on the steering column or other components of the steering system, typically through a gearbox 15 .

[0051] The electric m...

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PUM

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Abstract

A control strategy for an electric motor of an electric power assisted steering system of the kind in which a control means produces motor current demand signals that are fed to a motor drive means, the demand signals being dependent on the amount of assistance torque demanded from the motor, the motor drive means being arranged to cause currents to flow in each phase of the motor as required to meet the demanded assistance torque, the control strategy comprising limiting the rate of change of current that is drawn from the electrical supply of the vehicle by the motor in the event that it would otherwise exceed a threshold rate of change.

Description

technical field [0001] The invention relates to a control strategy for an electric motor of an electric power steering system. Background technique [0002] It is known to provide an electric power steering system in which an electric motor applies assist torque to a part of the steering system to make it easier for the driver to turn the wheels of the vehicle. The magnitude of the assist torque is determined according to a control algorithm that receives as input one or more parameters (such as torque applied to the steering column by the driver turning the wheels, vehicle speed, etc.). [0003] In order to accurately control motor torque, it is important to control the current applied to the motor. Typically, a star connected three-phase motor operating in a pulse width modulated control / drive strategy is used, with each phase connected to upper and lower drive stage switches connected to battery power and ground respectively. In a PWM strategy, each phase is driven with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D5/04H02P6/04H02P21/00
CPCH02P21/0035H02P2006/045G05B6/02B62D5/0481B62D5/0463B62D5/046H02P21/22
Inventor C·D·狄克逊P·G·斯科特森A·萨博H·蒋
Owner TRW LIMITED
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