HYDRAULIC CONTROL DEVICE AND CONTROL METHOD OF HYDRAULIC CONTROL DEVICE

摘要

In hydraulic control, an electronic control unit controls controlled hydraulic pressure of a control valve in order to control a hydraulic oil amount in a torque converter and a hydraulic oil pressure of a forward-reverse travel switching mechanism, and the electronic control unit increases the controlled hydraulic pressure when the hydraulic oil amount in the torque converter is insufficient at an engine start or immediately after the engine start in comparison with a case where the hydraulic oil amount in the torque converter is sufficient. The hydraulic control device includes: the torque converter; the forward-reverse travel switching mechanism; the control valve configured to change the hydraulic oil amount in the torque converter and the hydraulic oil pressure of the forward-reverse travel switching mechanism by changing the single controlled hydraulic pressure; and electronic control unit.

主权项

1. A hydraulic control device for a vehicle including an engine, the hydraulic control device comprising:
a torque converter configured to transmit rotary power of the engine via hydraulic oil; a forward-reverse travel switching mechanism including a frictional engagement element for travel that is engaged or disengaged based on a hydraulic oil pressure, the forward-reverse travel switching mechanism configured to switch a rotational direction of the rotary power transmitted from the torque converter by engagement or disengagement of the frictional engagement element; a control valve configured to change a hydraulic oil amount in the torque converter and the hydraulic oil pressure of the forward-reverse travel switching mechanism by changing a single controlled hydraulic pressure; and an electronic control unit configured to control the single controlled hydraulic pressure of the control valve to control the hydraulic oil amount in the torque converter and the hydraulic oil pressure of the forward-reverse travel switching mechanism, the electronic control unit configured to increase the single controlled hydraulic pressure when the hydraulic oil amount in the torque converter is insufficient at a start of the engine or immediately after the start of the engine than that when the hydraulic oil amount in the torque converter is sufficient at the start of the engine or immediately after the start of the engine.