Diagnostic device
First Claim
1. A diagnostic device for a temperature adjusting valve that adjusts a temperature of a coolant supplied to an engine of a vehicle, the device comprising:
- a processing system, including a computer processor, the processing system being at least configured to;
obtain the temperature of a discharge coolant which is the coolant discharged from the engine;
diagnose the temperature adjusting valve by comparing the temperature of the discharge coolant and a threshold; and
suspend a performed diagnosis of the temperature adjusting valve in a case where the temperature of the discharge coolant is estimated to be lower than the threshold according to an operating condition of the vehicle even though the temperature adjusting valve is normal;
calculate a heat receiving amount of the coolant after completion of a warm-up of the engine; and
calculate a heat radiating amount of the coolant after completion of the warm-up of the engine;
wherein a performed diagnosis of the temperature adjusting valve is suspended in a case where the calculated heat radiating amount of the coolant after completion of the warm-up of the engine is greater than the calculated heat receiving amount of the coolant after completion of the warm-up of the engine.
1 Assignment
0 Petitions
Accused Products
Abstract
An ECU that is a diagnostic device includes a calculation unit that is a water temperature obtaining unit obtaining the temperature of a discharge coolant which is a coolant discharged from an engine, a diagnostic unit that diagnoses a thermostat which is a temperature adjusting valve by comparing the temperature of the discharge coolant and a threshold, and a suspending unit that suspends a diagnosis performed by the diagnostic unit. The suspending unit suspends a diagnosis performed by the diagnostic unit in a case where the temperature of the discharge coolant is estimated to be lower than the threshold according to an operating condition of the vehicle even though the thermostat is normal.
18 Citations
12 Claims
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1. A diagnostic device for a temperature adjusting valve that adjusts a temperature of a coolant supplied to an engine of a vehicle, the device comprising:
a processing system, including a computer processor, the processing system being at least configured to; obtain the temperature of a discharge coolant which is the coolant discharged from the engine; diagnose the temperature adjusting valve by comparing the temperature of the discharge coolant and a threshold; and suspend a performed diagnosis of the temperature adjusting valve in a case where the temperature of the discharge coolant is estimated to be lower than the threshold according to an operating condition of the vehicle even though the temperature adjusting valve is normal; calculate a heat receiving amount of the coolant after completion of a warm-up of the engine; and calculate a heat radiating amount of the coolant after completion of the warm-up of the engine; wherein a performed diagnosis of the temperature adjusting valve is suspended in a case where the calculated heat radiating amount of the coolant after completion of the warm-up of the engine is greater than the calculated heat receiving amount of the coolant after completion of the warm-up of the engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
Specification