Control device for electric motor and hydraulic pressure supply system
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United States of America Patent
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Aug 18, 2020
Grant Date -
Dec 6, 2018
app pub date -
May 29, 2015
filing date -
May 29, 2015
priority date (Note) -
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Abstract
A hydraulic pressure supply system includes a mechanical oil pump; an electric oil pump; an electric motor that drives the electric oil pump; a control device that controls the operation of the electric oil pump; and a hydraulic pressure measurement circuit that measures a hydraulic pressure of the outlet-side pipe of the electric oil pump. The control device starts supplying electric power to the electric motor to thereby start drive of the electric oil pump before the mechanical oil pump stops operating, and limits the power-supply current to the electric motor to a first current or less during a time period between the start of the drive of the electric oil pump and the time when the hydraulic pressure measured by the hydraulic pressure measurement circuit exceeds a prescribed outlet hydraulic pressure.
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