Abstract: Apparatus for initializing a vehicle control digital computer to prevent erroneous operation. The apparatus comprises a circuit for generating a pulse signal with a predetermined fixed period and a circuit for supplying the pulse signal to the vehicle control digital computer. The computer is initialized by the pulse signal so that even if erroneous operation occurs in the computer, the control program starts normally from the beginning by the succeding initalizing operation.

Abstract: A method for controlling the supply of fuel and ignition spark for an internal combustion engine. The supply of fuel which is mixed with air is cut off upon engine deceleration and resumed thereafter. At the transition from the cut-off to resumption of supply of fuel, the timing of ignition spark which ignites the mixture of air and fuel is retarded enough to prevent an abrupt increase in an engine output torque. The retarded timing of ignition spark is then advanced gradually as the time passes so that the engine output torque increases gradually.

Abstract: A method and apparatus for initializing the operating condition of a computer mounted on a vehicle. The computer is programed to perform calculating operations required to control the operation of the vehicle in accordance with a preestablished operating sequence. An initializing pulse is produced in response to the start of supplying the electric power of a battery and applied to the computer so that the computer is initialized to perform the required operations. Another initializing pulse is produced in response to the end of cranking the engine mounted on the vehicle and applied to the computer to initialize again. Initializing the computer after cranking the engine prevents the computer from stopping the operation, the stoppage of which is likely to be caused by an electric noise signal produced at the end of cranking the engine.