Oliff & Berridge, PLC
Abnormality detector apparatus for a coolant apparatus for cooling an engine
 An abnormality detector apparatus for an engine water-cooling apparatus has an electronic control unit (ECU) for precisely and quickly determining and detecting an operation abnormality of a thermostat or a water temperature sensor. After the engine is started, the ECU calculates, over time, an engine heat generation quantity, an estimated cooling water temperature or the like on the basis of various engine operating condition parameters, such as cooling water temperature, intake temperature, engine revolution speed, amount of intake air, and the like. After the elapse of a predetermined time, the ECU compares the estimated cooling water temperature and the cooling water temperature actually detected by the water temperature sensor. If the relationship therebetween meets a predetermined condition, the ECU determines whether there is an abnormality in the operating condition of the thermostat and/or the cooling water temperature sensor. 
Toyoto Jidosha Kabushiki Kaisha
G F F F F G
G01K F01P F01P F01P F02D G05B
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Noritake Tomohiro Hideaki
Mitsutani Fujita Mizuno