| CPC F02D 41/0255 (2013.01) [F02D 2200/0804 (2013.01)] | 5 Claims |
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1. A control unit for an engine system including an engine and a catalyst for purifying exhaust gas from the engine, the control unit comprising:
an engine control unit configured to start the engine and perform a warm-up process for raising a temperature of the catalyst to a warm-up temperature when a temperature of the engine at an initial start of the engine after activation of the control unit is equal to or lower than a cold temperature, and configured to stop the engine when a stop request to the engine system is made;
a detection unit configured to detect a temperature of the engine when the stop request is made;
an estimation unit configured to estimate a temperature of the catalyst based on an operation state of the engine from a start of the engine to the stop request, when the stop request is made;
a determination unit configured to perform a determination process for predicting whether or not the temperature of the catalyst rises excessively due to execution of the warm-up process at a time of the initial start of the engine after next activation of the control unit, based on the temperature of the engine and the temperature of the catalyst, when the stop request is made; and
a stopping unit configured to stop the control unit based on a determination result of the determination unit,
wherein
when the determination result is a negative determination, the stopping unit stops the control unit,
when the determination result is a positive determination, the determination unit reperforms the determination process,
when the determination result is a positive determination and there is a request to start the engine system, the engine control unit starts the engine without performing the warm-up process, and
when the determination result obtained by reperforming the determination process is a negative determination, the stopping unit stops the control unit.
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