JP2007247910A5 - - Google Patents

Claims (9)

A drive source for driving the vehicle;
A mechanical oil pump driven by the drive source;
An electric motor composed of a three-phase brushless sensorless motor driven by a battery;
An electric oil pump driven by the electric motor;
A speed change mechanism configured to set a speed change ratio by hydraulic oil supplied from the mechanical oil pump and the electric oil pump, and to change the rotational driving force of the drive source and transmit it to the wheels;
A pump driver for controlling the operation of the electric motor;
A check valve provided so that hydraulic oil from the mechanical oil pump does not flow back to the electric oil pump;
An oil passage connecting the discharge side and the suction side of the electric oil pump;
A relief valve provided in the oil passage and opened when the oil pressure on the discharge side becomes a predetermined value or more,
When the pump driver starts the electric motor, the electric motor is operated so as to have a predetermined rotation speed for a holding time, and then the electric motor is operated so that a predetermined torque is output. Composed of
The hydraulic pressure supply device, wherein the hydraulic pressure at which the relief valve is opened is set to a value smaller than the hydraulic pressure at which the electric oil pump supplies hydraulic oil to the transmission mechanism. An oil temperature sensor for detecting the oil temperature of the hydraulic oil;
2. The hydraulic pressure supply device according to claim 1, wherein the pump driver is configured to set the holding time according to the oil temperature. 3. The hydraulic pressure supply device according to claim 1, wherein the pump driver is configured to set the rotation speed in accordance with the oil temperature. A three-phase brushless sensorless motor having a rotor having a permanent magnet and a stator coil and driving an electric oil pump for supplying hydraulic oil to a transmission mechanism of the vehicle, and driving the three-phase brushless sensorless motor A vehicle hydraulic pump drive device having a driver for
  The driver, as a control mode of the three-phase brushless sensorless motor, performs positioning / synchronization for identifying the position of the rotor and synchronizing the pulse voltage applied to the stator coil when the three-phase brushless sensorless motor is activated. Mode, a constant rotation mode for controlling the rotor to be maintained at a predetermined rotation speed after the positioning / synchronization mode is completed, and an output torque of the three-phase brushless sensorless motor after the constant rotation mode is A vehicle hydraulic pump drive device characterized by having a sensorless mode for controlling to become. 5. The positioning / synchronization mode is characterized in that the position of the rotor is specified by operating the three-phase brushless sensorless motor as a synchronous generator by the permanent magnet by cutting off power supply. Hydraulic pump drive device for vehicles. The driver is configured to shift the three-phase brushless sensorless motor to the constant rotation mode when the rotation speed of the rotor reaches the predetermined rotation speed in the positioning / synchronization mode. 5. The vehicle hydraulic pump drive device according to 4. 5. The vehicle hydraulic pump drive device according to claim 4, wherein the driver shifts the three-phase brushless sensorless motor to the sensorless mode after a lapse of a predetermined time after shifting to the constant rotation mode. 5. The vehicle hydraulic pump drive device according to claim 4, wherein the driver controls a pulse voltage applied to the stator coil by a pulse width modulation method. The speed change mechanism sets a speed change ratio by a mechanical oil pump driven by a drive source of a vehicle and hydraulic oil supplied from the electric oil pump, changes a rotational driving force of the drive source, and transmits it to a wheel. 5. The vehicle hydraulic pump drive device according to claim 4, wherein the vehicle hydraulic pump drive device is one.