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Electric power steering device

An electric power steering and electric motor technology, which is applied to electric steering mechanisms, power steering mechanisms, automatic steering control components, etc., can solve the problems of complex units and increased circuit components, and achieves simplification of drive circuits, reduction of abnormal judgment processes, and reduction of monitoring. The effect of the circuit

Active Publication Date: 2016-01-13
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the conventional electric power steering device having a power supply relay in which MOSFETs are connected in series, there are problems such as that the number of circuit elements increases, and the unit for checking the abnormality of the circuit elements also becomes complicated.

Method used

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  • Electric power steering device
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Embodiment approach 1

[0030] Next, an electric power steering device according to Embodiment 1 of the present invention will be described based on the drawings. figure 1 It is a configuration diagram of a main part of the electric power steering device according to Embodiment 1 of the present invention. figure 1 In the monitor 19, the output shaft of the monitor 19 is connected to the steering device of the vehicle via a speed reduction mechanism (not shown), and as will be described later, a torque corresponding to the driver's steering torque is generated, and the generated torque is transferred. The torque is applied as assist torque to the steering device of the vehicle via the reduction mechanism.

[0031] The control unit 2 includes a motor drive circuit 18, a computing device (hereinafter referred to as CPU) 17, a power relay 3, a power relay drive circuit 14, an electrolytic capacitor 8 as a capacitor, a charging circuit 16, a first monitoring circuit 9, and a second monitoring circuit 9. ...

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PUM

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Abstract

An electric power steering device provided with: a power source relay comprising a first switching element connected to a battery, and a second switching element connected in series to the first switching element and connected to a drive circuit for driving a motor; a monitor circuit for monitoring voltage between the drive circuit and the second switching element; and a computation device for determining abnormalities in the power source relay on the basis of a command signal for controlling the power source relay and on the basis of the voltage monitored by the monitor circuit.

Description

technical field [0001] The present invention relates to an electric power steering device that uses an electric motor to assist the steering force of a steering wheel. Background technique [0002] As is well known, an electric power steering device has a structure that detects a steering torque applied to a steering wheel by a driver, and uses an electric motor to generate torque corresponding to the detected steering torque to assist the driver's steering force. [0003] Conventionally, there is an electric power steering device having a structure in which a mechanical power relay is arranged on a power supply path from a power source such as an on-vehicle battery to a motor, and the power supply circuit connected to the motor is shut off by controlling the power relay. open, close. In addition, there is an electric power steering apparatus in which the mechanical power supply relay is constituted by a switching element such as a MOSFET (Metal Oxide Semiconductor Field Ef...

Claims

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Application Information

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IPC IPC(8): B62D6/00B62D5/04
CPCB62D5/0481
Inventor 五百原巧
Owner MITSUBISHI ELECTRIC CORP