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Electric power steering device

A power steering, electric technology, applied in electric steering mechanism, power steering mechanism, steering mechanism, etc., can solve problems such as capacitor voltage drop

Active Publication Date: 2015-04-29
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, when the power supply relay is turned off, if the discharge circuit discharges the charge of the capacitor for power supply stabilization with the precharge circuit stopped, the voltage on the capacitor side of the power supply relay contact will drop.

Method used

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  • Electric power steering device
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Embodiment approach 1

[0030] Next, the electric power steering device according to Embodiment 1 of the present invention will be described in detail with reference to the drawings. figure 1 It is a configuration diagram showing the overall configuration of the electric power steering device according to Embodiment 1 of the present invention. exist figure 1 In the electric power steering device 100 shown, the steering wheel 101 is connected to the wheel link via the steering wheel shaft 102, the reduction gear 103, the universal joint 104 on the steering wheel side, the universal joint 105 on the rack mechanism side, and the rack mechanism 106. 107 are connected. The torque sensor 110 provided on the steering wheel shaft 102 detects the steering torque applied to the steering wheel 101 by the driver. An electric motor 120 that generates assist torque corresponding to a steering force applied to the steering wheel 101 is connected to the steering wheel shaft 102 via a reduction gear 103 .

[0031]...

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Abstract

The invention provides an lectric power steering device capable of correctly detecting the on / off of a power relay even when the voltage of a battery changes to low level. When the voltage, detected by a terminal voltage detection circuit, of a motor drive circuit side terminal of the power relay is lower than a predetermined value which is set lower than a voltage of the battery when an engine crank is rotated, after a capacitor for power stablization is charged by precharging circuit to reach at least a predetermined value, the on-off othe power relay is determined by an on- / off determining unit based on the voltage of the motor drive circuit side terminal of the power relay detected by the motor drive circuit side terminal of the power relay in the case that the power relay is driven to an on state.

Description

technical field [0001] The present invention relates to an electric power steering device including a power supply relay connected between a battery and a motor drive circuit, and a capacitor for power supply stabilization. Background technique [0002] Conventionally, in an electric power steering apparatus including a power supply relay connected between a battery and a motor drive circuit, and a power supply stabilizing capacitor, when the power supply relay is switched to the energized state as the ignition switch is turned on, in order to To suppress the rush current (rush current) flowing from the battery into the capacitor for power supply stabilization, a precharge circuit is provided that charges the capacitor for power supply stabilization before driving the power relay to the energized state. After charging the capacitor for power stabilization, switch the power relay to the energized state. [0003] However, in such a conventional electric power steering apparat...

Claims

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Application Information

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IPC IPC(8): B62D5/04
CPCB62D5/046B62D5/0481
Inventor 川崎慧西村裕史永井勇若井满
Owner MITSUBISHI ELECTRIC CORP