Control device for hybrid vehicle

A hybrid vehicle control device for a hybrid vehicle, wherein:

• the hybrid vehicle includes a driveline, wherein the driveline includes an engine, a motor, a belt-type continuously variable transmission, and a friction clutch, wherein the belt-type continuously variable transmission is configured to be controlled hydraulically, and wherein the friction clutch is disposed in a driving force transmission line between the motor and a driving wheel;
• the belt-type continuously variable transmission includes a primary pulley, a secondary pulley, and a belt, wherein the belt is wound over the primary pulley and the secondary pulley, and configured to be clamped by a primary pulley pressure as a belt-clamping pressure at the primary pulley and a secondary pulley pressure as a belt-clamping pressure at the secondary pulley;
• and
• the hybrid vehicle employs an electric vehicle (EV) mode as a drive mode, and is configured to control the belt-clamping pressures based on a discharge oil of an oil pump when the EV mode is selected, wherein the EV mode employs the motor as a drive source without employing another drive source, and wherein the oil pump is configured to be driven by the motor;
• the hybrid vehicle control device comprising a controller configured to:
• obtain a parameter set including at least a motor torque value, wherein the motor torque value is a value of torque of the motor;
• learn a zero-point oil pressure command value based on the parameter set, wherein the friction clutch starts to have a non-zero torque capacity at the zero-point oil pressure command value;
• control rotational speed of the motor to a first motor idle rotational speed, in response to a satisfaction of a creep-cut condition requiring no creep torque of the motor when the hybrid vehicle is stationary with the EV mode selected;
• and
• reduce, after controlling the rotational speed of the motor to the first motor idle rotational speed, the rotational speed of the motor from the first motor idle rotational speed to a second motor idle rotational speed, in response to a completion of the learning of the zero-point oil pressure command value, wherein the second motor idle rotational speed is lower than the first motor idle rotational speed.