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US 2013/0171008 A1Published application
Electric pump system
AssigneeJtekt Corporation
InventorsKengo UDA, Yasuyuki AOKI, Hiroki KAGAWA
Life of this patent
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Abstract
In an electric pump system, hydraulic fluid that is stored in an oil pan is supplied to a transmission mechanism through an oil passage by driving an oil pump with the use of a motor. An EOPECU estimates a hydraulic pressure of the hydraulic fluid on the basis of a driving current for the motor and a rotation speed of the motor, and executes drive control on the motor on the basis of the estimated hydraulic pressure value.
Claims20
An electric pump system, comprising:
- an oil pump that supplies hydraulic fluid to a hydraulically-actuated device through an oil passage as a motor is driven;
- and
- a control unit that executes drive control on the motor based on a hydraulic pressure of the hydraulic fluid in the oil passage, wherein
- the control unit estimates a hydraulic pressure value of the hydraulic fluid based on a driving current for the motor and a rotation speed of the motor.
1 more element
Dependencies are inferred from the claim text.