Eco-run control device and eco-run control method

An eco-run control device, comprising:

• a control unit configured to perform an eco-run control of stopping an engine on the basis of stop conditions and of restarting the engine on the basis of restart conditions;
• a starter driving unit configured to drive a starter for restarting the engine;
• a test unit configured to perform a failure test of the starter driving unit to determine whether the starter driving unit is out of order before the control unit stops the engine by the eco-run control;
• a nullifying unit configured to nullify the failure test by the test unit when it is detected that a power supply voltage supplied to the starter driving unit drops below a predetermined value;
• and
• a prohibiting unit configured to prohibit the control unit from performing the eco-run control when the test unit determines that the starter driving unit is out of order, wherein
• the prohibiting unit prohibits the control unit from performing the eco-run control in a case where the nullifying unit nullifies the failure test by the test unit during a test period in which the test unit performs the failure test,
• the prohibiting unit prohibits the control unit from performing the eco-run control until the prohibiting unit determines that the failure test is completed,
• the nullifying unit causes the prohibiting unit not to determine that the failure test is completed even when the failure test is completed, to nullify the failure test when it is detected that the power supply voltage supplied to the starter driving unit drops below the predetermined value during the test period,
• the test unit operates a circuit constituting a part of the starter driving unit with a predetermined pattern in the test period, and
• the nullifying unit nullifies the failure test when it is detected that the power supply voltage supplied to the starter driving unit drops below the predetermined value during the test unit operating the circuit with the predetermined pattern.