Thermostat fault diagnosis method and device, computer device and storage medium

A thermostat fault diagnosis device, comprising:

• an environment temperature module, configured to acquire a current environment temperature and a boundary temperature and initial opening temperature corresponding to the current environment temperature;
• a thermal equilibrium data acquiring module, configured to acquire engine thermal equilibrium state data determined based on coolant temperature change data in an engine;
• a coolant temperature module, configured to acquire a current coolant temperature;
• and
• a fault determination module, configured to judge, according to the engine thermal equilibrium state data and a relationship between the current coolant temperature and the boundary temperature and initial opening temperature, whether a thermostat is faulty;
• wherein the fault determination module is further configured to judge, when the current coolant temperature is less than the boundary temperature, whether the thermostat is faulty by a boundary temperature method according to the engine thermal equilibrium state data;
• judge, when the current coolant temperature is greater than or equal to the boundary temperature and is less than the initial opening temperature, whether the thermostat is faulty by a temperature drop learning method or an active control method according to the engine thermal equilibrium state data;
• and judge, when the current coolant temperature is greater than or equal to the initial opening temperature, whether the thermostat is faulty by a thermal equilibrium determination method or an inheritance determination method according to the engine thermal equilibrium state data,
• wherein the thermal equilibrium data acquiring module is further configured to acquire a standard thermal equilibrium time parameter;
• the fault determination module is further configured to determine a starting mode of the engine based on a starting temperature, if the starting mode is cold start, the fault determination module obtain the engine thermal equilibrium duration according to an engine coolant temperature curve, and the fault determination module determines that the thermostat is normal when the engine thermal equilibrium duration exceeds the standard thermal equilibrium time parameter.