Patent ID: 7311082

Claim:
A straddle type vehicle having an electronic throttle valve system for adjusting the amount of intake air to an internal combustion engine, the electronic throttle valve system comprising: a throttle valve for adjusting the amount of intake air to the internal combustion engine; an electric motor for actuating the throttle valve; and a control unit for controlling the electric motor, wherein the throttle valve is fixed to a valve shaft; the electric motor, connected to the valve shaft, is located for actuating the throttle valve through the valve shaft; the valve shaft is provided with, on a right end thereof, a throttle opening sensor for detecting the opening of the throttle valve; and the valve shaft is provided with, on a left end thereof, a mechanical, throttle valve actuating mechanism with which a throttle cable is engaged, the throttle cable being coupled to an acceleration controller provided on a right one of a pair of handlebars of the straddle type vehicle, the mechanical, throttle valve actuating mechanism has a structure for actuating the throttle valve in conjunction with the operation of the throttle grip, in the event that the electric motor stops actuating the throttle valve, the mechanical, throttle valve actuating mechanism is provided with an accelerator-opening sensor for detecting the displacement of the acceleration controller; the accelerator-opening sensor is in electrical connection with the control unit; and the control unit controls the electrical motor based on the opening of the acceleration controller detected by the accelerator-opening sensor, and wherein the electric motor is connected via a drive gear to a midsection between the right end and the left end of the valve shaft.