Patent ID: 8758193

Claim:
A vehicle driving system including: an internal combustion engine section that generates rotational power; a transmission mechanism that outputs the generated rotational power of the internal combustion engine section while changing a speed thereof; a one-way clutch that is provided in an output portion of the transmission mechanism, the one-way clutch having: an input member that receives the rotational power from the transmission mechanism; an output member; and an engagement member that makes the input member and the output member enter a locked state or an unlocked state with each other, so that the input member and the output member enter the locked state when a rotational speed of a positive direction of the input member exceeds a rotational speed of a positive direction of the output member, thereby transmitting the rotational power from the input member to the output member; and a driving target member that is connected to the output member of the one-way clutch and transmits the rotational power to be transmitted to the output member to a driving wheel, wherein the rotational power of the internal combustion engine section is input to the one-way clutch via the transmission mechanism, and the rotational power is input to the driving target member via the one-way clutch, the system further including: a main motor/generator that is connected to the driving target member; a sub motor/generator that is connected to an output shaft of the internal combustion engine section; a power storage unit that supplies and receives power between the main motor/generator and/or the sub motor/generator; and a controller that drives the sub motor/generator as a generator by the internal combustion engine section and performs a series running control mode which controls a series running in which a motor running is carried out due to the driving force of the main motor/generator while supplying the generated power to the main motor/generator and/or the power storage unit, and wherein the controller controls a rotational speed of the internal combustion engine section and/or a transmission ratio of the transmission mechanism so that rotational speed input to the input member of the one-way clutch is less than the rotational speed of the output member during the series running control.