Control device for vehicle drive device

Abstract

A control device of a vehicle drive device including an electromagnetic valve oil pump sucking and discharging hydraulic oil through ON/OFF operations of an electromagnetic valve, a drive frequency controller for controlling a drive frequency at which the electromagnetic valve is to be turned on/off, a temperature sensor for detecting an oil temperature of the hydraulic oil, and a hydraulic circuit supplied with the hydraulic oil discharged from the electromagnetic valve oil pump, the control device of a vehicle drive device further including a surge absorption circuit absorbing a counter electromotive force generated in the electromagnetic valve oil pump, the drive frequency of operation of the electromagnetic valve oil pump being set lower when the oil temperature is low than when the oil temperature is high.

1 . A control device of a vehicle drive device including an electromagnetic valve oil pump sucking and discharging hydraulic oil through ON/OFF operations of an electromagnetic valve, a drive frequency controller for controlling a drive frequency at which the electromagnetic valve is to be turned on/off, a temperature sensor for detecting an oil temperature of the hydraulic oil, and a hydraulic circuit supplied with the hydraulic oil discharged from the electromagnetic valve oil pump,
 the control device of a vehicle drive device further including a surge absorption circuit absorbing a counter electromotive force generated in the electromagnetic valve oil pump,   the drive frequency of operation of the electromagnetic valve oil pump being set lower when the oil temperature is low than when the oil temperature is high.   
     
     
         2 . The control device of a vehicle drive device of  claim 1 , wherein the oil temperature of the hydraulic oil is calculated based on a solenoid current of the electromagnetic valve. 
     
     
         3 . The control device of a vehicle drive device of  claim 1 , wherein the drive frequency of the electromagnetic valve oil pump continuously varies depending on the oil temperature. 
     
     
         4 . The control device of a vehicle drive device of  claim 1 , wherein the drive frequency of the electromagnetic valve oil pump varies in stages based on a preset threshold value of the oil temperature. 
     
     
         5 . The control device of a vehicle drive device of  claim 1 , wherein the oil temperature of the hydraulic oil is detected by an oil temperature sensor and calculated based on the solenoid current of the electromagnetic valve, wherein
 the oil temperature is normally detected by the oil temperature sensor, and is calculated based on the solenoid current when the oil temperature is not detected by the oil temperature sensor.   
     
     
         6 . The control device of a vehicle drive device of  claim 5 , wherein a control portion supplied with an oil temperature signal from the oil temperature sensor is separated from a control portion configured to control the oil temperature based on the solenoid current of the electromagnetic valve. 
     
     
         7 . The control device of a vehicle drive device of  claim 1 , wherein a mechanical oil pump driven by an engine is further included, and wherein
 the electromagnetic valve oil pump is driven during stop of the engine.   
     
     
         8 . The control device of a vehicle drive device of  claim 7 , wherein the hydraulic oil discharged from the electromagnetic valve oil pump is supplied to a start clutch of a transmission. 
     
     
         9 . The control device of a vehicle drive device of  claim 1 , wherein the electromagnetic valve oil pump has an intake oil passage for sucking the hydraulic oil and a discharge oil passage for discharging the hydraulic oil, and wherein a cross-sectional area of the intake oil passage is larger than a cross-sectional area of the discharge oil passage.