Regenerative braking system for car

Claim 1

A regenerative braking system for a car having an accelerator pedal power take-off unit, an engine and a transmission gear, comprising: a hydraulic oil circuit formed of: a high pressure accumulator; a pump/motor having a maximum motoring capacity; a circuit valve coupled to said pump/motor and said high pressure accumulator; and a low pressure accumulator coupled to said circuit valve; an electromagnetic clutch, coupled to said pump/motor, for connecting or disconnecting said pump/motor to or from the power take-off unit; means for sensing the position of the accelerator pedal; means for sensing the pressure of said hydraulic oil circuit; means for sensing the position of the transmission gear; means for sensing the speed of the car; control means for automatically controlling the position of the transmission gear based on the sensed position of the accelerator pedal and the sensed car speed, for determining a driving torque required for the car according to the sensed position of the accelerator pedal and the sensed position of the transmission gear, and for determining the motoring capacity of said pump/motor based on the determined driving torque and the sensed pressure of said hydraulic oil circuit, said control means coupling the engine of the car and said electromagnetic clutch, and closing said hydraulic oil circuit in which said pump/motor is controlled to have the maximum motoring capacity, the engine being controlled to have the output for providing a supplemental torque when the determined driving torque exceeds the maximum motoring capacity in an accelerating mode of the car.