Cooling device for internal combustion engine
a technology for internal combustion engines and cooling devices, which is applied in the direction of machines/engines, process and machine control, instruments, etc., can solve problems such as possible erroneous determinations, and achieve the effect of suppressing erroneous determinations
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modified example 1
[0077]In the embodiment described above, starting of the thermostat valve failure diagnosis process after starting of the engine (the diagnosis precondition is met) is delayed based on the rise quantity (ΔECT) of the engine coolant water temperature (ECT detection value) after starting of engine 20. In place of water temperature rise quantity ΔECT, an integrated amount of the intake air volume into engine 20 from starting of engine 20 may be used. This is because the integrated intake air volume from starting of engine 20 may represent a tendency of the rise in temperatures of engine 20 and the coolant water.
[0078]The overall configuration of the vehicle in this Modified Example 1 is the same as vehicle 100 shown in FIG. 1. Moreover, the procedures of the overall process of the thermostat valve failure diagnosis executed by ECU 200 of this Modified Example 1 is the same as the process procedures shown in FIG. 3.
[0079]FIG. 5 is a flowchart representing process procedures of the diagn...
modified example 2
[0084]While starting of the thermostat valve failure diagnosis from starting of engine 20 (the diagnosis precondition is met) is delayed based on the integrated intake air volume from starting of engine 20 in Modified Example 1 described above, time from starting of engine 20 can be measured to use an elapsed time after starting of the engine. Accordingly, the process of capturing a detection signal of a sensor and the calculation process are not required, so that the process of ECU 200 is simplified. Moreover, starting of the failure diagnosis can be adjusted without being affected by an abnormality of the sensor and a measurement accuracy.
[0085]The overall configuration of the vehicle in this Modified Example 2 is the same as that of vehicle 100 shown in FIG. 1. Moreover, the procedures of the overall process of the thermostat valve failure diagnosis executed by ECU 200 in this Modified Example 2 are the same as the process procedures shown in FIG. 3.
[0086]FIG. 6 is a flowchart re...
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