Patent ID: 7055635

Claim:
An electric power regeneration control unit for a hybrid vehicle having an internal combustion engine receiving fuel and an intake air quantity, a motor generator which functions as a generator operated by driving force received from the internal combustion engine or drive wheels, a fluid torque converter disposed between said motor generator and said drive wheels, a lockup clutch to engage or disengage rotational members on input and output sides of said fluid torque converter, said lockup clutch being engaged or partially engaged after preventing the fuel cut and increasing intake air quantity for said engine when an accelerator is released within a range in which said lockup clutch can be engaged or disengaged, and a controller to permit said motor generator to generate electric power by the force received from said drive wheels when said accelerator is below a certain opening angle, wherein said controller is provided with an engagement finish determining device to determine whether engagement of said lockup clutch is finished, and said controller controls such that both the prevention of fuel cut and increase in intake air quantity are discontinued and said motor generator starts to generate electric power if said engagement finish determining device determines that engagement of said lockup clutch is finished.