Electric power steering system

An electric power steering and electric power technology, which is applied to power steering mechanisms, electric steering mechanisms, automatic steering control components, etc., can solve problems such as uncoordinated steering

Inactive Publication Date: 2014-05-14
JTEKT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the driver may feel uncoordinated steering when operating the steering wheel

Method used

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  • Electric power steering system
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Examples

Experimental program
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Embodiment Construction

[0021] refer to figure 1 The configuration of the electric power steering system according to the present embodiment, hereinafter referred to as EPS1, will be described.

[0022] EPS 1 has an EPS main body 10 , an auxiliary device 20 , a control device 30 , an auxiliary power supply 40 , a torque sensor 50 , and a vehicle speed sensor 60 . EPS 1 has a configuration in which electric power is supplied to auxiliary device 20 from a battery as main power source 4 and auxiliary power source 40 via control device 30 . The EPS 1 assists the operation of the steering wheel 2 with the assist device 20 based on the torque sensor 50 and the vehicle speed sensor 60 .

[0023] The EPS main body 10 has a column shaft 11 , an intermediate shaft 12 , a pinion shaft 13 , a rack shaft 14 , a rack and pinion mechanism 15 , and two tie rods 16 . The EPS main body 10 integrally rotates the steering column shaft 11 , the intermediate shaft 12 , and the pinion shaft 13 as the steering wheel 2 rot...

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PUM

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Abstract

The invention provides an electric power steering system. The electric power steering system includes: an electric motor (21) that generates assist torque based on steering torque; an auxiliary power supply (40) connected in series with a main power supply (4) that supplies electric power to the electric motor (21), and capable of discharging electric power to the electric motor (21); and a control device (30) that controls a voltage to be applied to the electric motor (21). When the auxiliary power supply (40) starts discharging electric power to the electric motor (21), the control device (30) gradually increases a duty ratio of a switching element (44A), which is a command signal for commanding the auxiliary power supply (40) to discharge electric power.

Description

technical field [0001] This application claims the priority of Japanese Patent Application No. 2012-241131 for which it applied on October 31, 2012, and uses the whole content here. [0002] The present invention relates to an electric power steering device with an auxiliary power source. Background technique [0003] Existing electric power steering devices have an auxiliary power supply connected in series with the main power supply. [0004] In this electric power steering system, when a large assist force is required for static steering steering such as when the vehicle is parked or parked, and the power consumption of the electric motor that assists the steering of the steering wheel is large, in addition to the power supply of the main power supply, an auxiliary power supply is also used. The discharge of the power supply drives the electric motor. This suppresses the power consumption of the main power supply. This electric power steering device does not require a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D6/00B62D137/00B62D5/04
CPCB62D5/0481B62D5/046H02P23/0027
Inventor 杉山丰树东真康
Owner JTEKT CORP
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