Patent ID: 8498800

Claim:
An engine control unit comprising: a drive system capable of driving a motorcycle backward while an engine is running; a throttle valve energized toward a closed position by a return spring; and a drive-by-wire system for detecting amount of operation of an accelerator by accelerator opening sensors for driving said throttle valve by a throttle motor in response to the amount of operation, thereby controlling an opening of said throttle valve and detecting said opening by throttle opening sensors, wherein said engine control unit includes: an anomaly judging section for judging whether or not there is anomaly in said throttle valve opening sensors based on the output of said throttle valve opening sensors, a throttle motor driving section for controlling the driving of said throttle motor, and an ignition timing control section having first and second ignition timing maps for controlling ignition timing at a time of starting the engine; a fuel injection control section including: first and second fuel injection maps for controlling an amount of fuel injection at the time of starting the engine, and first and second temperature correction maps for determining the amount of fuel injection after the engine is started by performing temperature correction in response to a water temperature of said engine, said throttle motor driving section stops the driving of said throttle motor if said throttle valve opening sensors are judged to be anomalous by said anomaly judging section, thereby causing said throttle valve to be returned to the closed position by said return spring, and wherein said first fuel injection map is used for starting the engine when said throttle valve opening sensors are in a normal state, and said second fuel injection map is used for starting the engine when said throttle valve opening sensors are in an anomalous state, the amount of fuel injection set by the second fuel injection map being smaller than that set by the first fuel injection map, and said fuel injection control section also switches said first fuel injection map for starting the engine in the normal state into said second fuel injection map for starting the engine in the anomalous state, at a time of restarting the engine after the engine stops in a state wherein said throttle valve opening sensors are judged to be anomalous by said anomaly judging section, thereby enabling the engine to start and allowing the motorcycle to be moved backward by said drive system.