Patent attributes
An engine starting device for controlling an engine start of a vehicle by driving a starter relay of the vehicle with a battery of the vehicle as a power supply has a control processing unit and a step-up circuit for stepping up the output of the battery and outputting a drive voltage for driving the control processing unit and the starter relay. The control processing unit has a function of performing an engine start control of applying the drive voltage to the starter relay to activate the starter relay in time of the engine start at which an engine starting condition is satisfied The control processing unit performs a control function on the step-up circuit to activate the step-up circuit so that the drive voltage does not become lower than a minimum operation voltage of the starter relay in a predetermined period necessary to start the engine in time of the engine start, and activate the step-up circuit so that the drive voltage does not become lower than a first voltage value higher than a minimum operation voltage of the control processing unit and lower than the minimum operation voltage of the starter relay when not in the predetermined period.
