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Electric Power Steering

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: 2017-06-23
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 power supply stabilizing capacitor while the precharge circuit is stopped, the voltage on the capacitor side of the power supply relay contact will drop.

Method used

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Embodiment approach 1

[0033] 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 .

[0034]...

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Abstract

The present invention provides an electric power steering device capable of accurately determining whether to turn on / off a power supply relay even when the voltage of a battery fluctuates to a low potential. When the voltage of the motor drive circuit side terminal of the power relay detected by the terminal voltage detection circuit is lower than the specified value set lower than the battery voltage when the engine cranks, a capacitor for stabilizing the power supply by the precharge circuit After charging to at least the predetermined value, the power supply relay is energized by the power on / off determination unit based on the voltage of the motor drive circuit side terminal of the power supply relay detected by the terminal voltage detection circuit when the power supply relay is driven into the energized state. / disconnect for judgment.

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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Patent Type & Authority Patents(China)
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