Thermostat malfunction detecting system for engine cooling system
First Claim
1. A method for performing diagnosis of a cooling system of an internal combustion engine using an electronic control unit, comprising:
- determining fuel injection amounts of the engine;
detecting temperatures of the engine; and
diagnosing the cooling system based at least in part on the detected fuel injection amounts of the engine and the detected temperatures of the engine, and taking a particular action based thereon.
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Abstract
A malfunction of a thermostat in a coolant circulating path is detected from an engine side coolant temperature in consideration of the following behavior of the coolant temperature. When an open-malfunction occurs, the coolant temperature becomes different considerably from that in the normal time in the temperature range in which the thermostat is to be normally closed. When a closure-malfunction occurs, the coolant temperature becomes different considerably from that during the normal time in the temperature range in which the thermostat is to be normally opened. Alternatively, the malfunction may be detected from a difference between the engine side coolant temperature and a radiator side coolant temperature.
53 Citations
29 Claims
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1. A method for performing diagnosis of a cooling system of an internal combustion engine using an electronic control unit, comprising:
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determining fuel injection amounts of the engine; detecting temperatures of the engine; and diagnosing the cooling system based at least in part on the detected fuel injection amounts of the engine and the detected temperatures of the engine, and taking a particular action based thereon. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for performing diagnosis of a cooling system of an internal combustion engine using an electronic control unit, comprising:
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determining fuel injection amounts of the engine; detecting temperatures of the engine; calculating an accumulated quantity of heat based on the fuel injection amounts of the engine; and taking a particular action associated with the diagnosis of the cooling system based at least in part on the detected fuel injection amounts of the engine and the detected temperatures of the engine, wherein taking the particular action based at least in part on the fuel injection amounts of the engine and the detected temperatures of the engine comprises taking the particular action based on the calculated accumulated quantity of heat and the detected temperatures of the engine. - View Dependent Claims (26, 27, 28, 29)
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Specification