Idling stop control device

An idling stop control device of a vehicle including:

• an internal combustion engine;
• an in-vehicle electric power source including an electric power generator that generates an electric power by a rotation of the engine and a battery that is charged with an electric power by the electric power generator;
• a starter that starts an operation of the engine with the electric power supplied from the battery;
• and
• an electric actuator that changes a motion state of the vehicle during a travelling of the vehicle with the electric power supplied from the in-vehicle electric power source,
• the idling stop control device comprising an electronic control unit programmed to execute an idling stop control when a predetermined condition is satisfied during the travelling of the vehicle, the idling stop control including an automatic engine stop control that automatically stops the operation of the engine and an automatic engine restart control that restarts the operation of the engine,
• wherein the electronic control unit is programmed:
• to acquire a remaining electric power amount index value which represents a magnitude of an amount of an electric power remaining in the battery;
• to detect an activation state of the electric actuator;
• to execute the automatic engine stop control to stop the operation of the engine when an automatic engine stop condition, which includes a condition that the remaining electric power amount index value is equal to or larger than an engine stop permission threshold, is satisfied;
• to execute the automatic engine restart control to restart the operation of the engine when an automatic engine restart condition which includes a condition that at least the remaining electric power amount index value is smaller than an engine restart threshold after the operation of the engine is automatically stopped, is satisfied;
• and
• to change the engine stop permission threshold from a first threshold, which has been set until the start of the activation of the electric actuator, to a second threshold, which is larger than the first threshold, when the electronic control unit does not execute the automatic engine stop control and detects the activation of the electric actuator.