Engine automatic control system for vehicles

In an engine automatic control system for a vehicle having an ignition switch for selectively connecting an electric source with an engine starter and an engine ignition circuit comprising switch means to be closed by disengaging operation of clutch means of the vehicle, a starter energizing circuit for connecting said electric source with said starter in response to the closing operation of said switch means, a starter cut-off circuit for detecting the start of engine rotation caused by said starter and cutting off current supply to said starter, speed sensing means for detecting the speed of the vehicle, and an engine control circuit controlled by said speed sensing means for maintaining said engine ignition circuit conductive while the vehicle runs and for making said ignition circuit non-conductive when the vehicle is arrested,

• the improvement comprising setting means interposed between said ignition switch and said ignition circuit for selectively disconnecting said ignition circuit from said ignition switch and setting said engine control system to its operative condition and cancelling means coupled with said setting means for automatically cancelling the operative condition of said engine control system when an operator leaves the vehicle.