Engine automatic control system for vehicles

DETAILED DESCRIPTION What is claimed is: 1.
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.
2.
An engine automatic control system as claimed in claim 1, wherein said setting means is a self-holding circuit connected with said electric source through said ignition switch and provided therein with a self-holding relay to be energized under the operative condition of said ignition switch, the energization of said self-holding relay connecting said electric source with said engine control system and said cancelling means is a release switch coupled with said self-holding circuit for automatically deenergizing said self-holding relay when an operator leaves the vehicle.
3.
An engine automatic control system as claimed in claim 2, wherein said release switch is a normally open switch provided in a vehicle door structure to be closed by opening of said vehicle door