Patent ID: 8972154
Filing Date: 2015-03-03
Classification: B60L,B60W,F01P,F02D,F02G,F02N,Y02T

Abstract:
1. An engine stop determination device comprising: an engine for driving a wheel; at least one vehicle state detection sensor for detecting the state of the vehicle; and a stop determination controller configured to make an engine stop determination based on a detected state of the vehicle for determining whether to permit an operation stop of the engine or not; a first coolant route for circulating coolant between a water jacket of the engine and a heater core; a second coolant route formed to merge with the first coolant route between the water jacket and an upstream side of the heater core and being for circulating the coolant between a waste heat recovery unit and the heater core; a coolant force-feed unit being able to circulate the coolant in the first coolant route and the second coolant route even when the engine is in an operation stop; a shutoff valve provided on the first coolant route and being opened and closed between the water jacket and a merging point with the second coolant route; a first water-temperature sensor provided in the water jacket or between the water jacket and the shutoff valve on the first coolant route; and a second water-temperature sensor provided between the merging point on the second coolant route with the first coolant route and the heater core; and wherein the stop determination controller is configured: to perform the engine stop determination based on coolant temperatures detected by the first water-temperature sensor and the second water-temperature sensor, and to selectively use, in making the engine stop determination, the coolant temperatures detected by the first water-temperature sensor and the second water-temperature sensor in dependence on whether a heater unit including the heater core is in an operation state or in an out-of-operation state.