| abstract |
PROBLEM TO BE SOLVED: To accurately detect an abnormality of an engine cooling water circulation system. SOLUTION: In order to estimate the engine cooling water temperature, it is determined whether or not a grill shutter (50) is in an open state, and the blower air of a blower (63) flows through an air conditioning heater (65). Four learned neural networks (150A, 150B, 150C, 150D) in which weights have been learned are stored for each of the four states, that is, the state and the state. The engine cooling water temperature is estimated by using one learned neural network selected from these four learned neural networks (150A, 150B, 150C, 150D), and the engine cooling water temperature is estimated based on the estimated engine cooling water temperature. An abnormality in the cooling water circulation system is detected. [Selection diagram] Fig. 21 |