Diagnostic system and diagnostic method for valve type thermostat and vehicle

Abstract

The invention provides a diagnostic system and diagnostic method for a valve type thermostat and a vehicle. By means of the diagnosis system and the diagnosis method, whether a valve of the valve type thermostat breaks down or not can be diagnosed, the fault is reported or not according to the diagnosis result, if it is diagnosed that a suspected locked-rotor fault exists, repair is tried before the locked-rotor fault is reported, if repair succeeds, the locked-rotor fault is not reported, and false alarm is avoided. In addition, response can be made according to reported faults, so that an engine is maintained in a safe temperature range, and the engine is prevented from being damaged due to over-temperature. The vehicle comprises the engine provided with the valve type thermostat and the diagnostic system of the valve type thermostat.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a diagnosis system, a diagnosis method and a vehicle of a valve type thermostat. Background technique [0002] During the use of the internal combustion engine, about 30% of the heat is taken away by the coolant. In order to avoid the engine temperature from being too high or too low and improve the energy utilization rate of the internal combustion engine, the industry has begun to use valve-type thermostats to help the engine body dissipate heat. . Valve-type thermostats often use multi-way valves, which can realize the mutual coupling of different cooling circuits and reasonably distribute the coolant flow of different cooling circuits, so as to realize the optimal management of engine heat. It has the advantages of fast response and precise control of engine coolant temperature. The characteristics improve engine efficiency and reduce fuel consumption, so it is favored by ma...

AI Technical Summary

Problems solved by technology

[0004] There are some problems in the diagnosis and response strategy of the existing valve thermostat, for example, there is no clear distinction between the stall fault of the valve thermostat and the fault of the driving stage, which leads to the coupling together and the cause of the fault cannot be clarified, and some stall faults It has little effect on the thermal state of the engine. If a stall is found and a fault is reported directly to the engine controller, it will easily cause false alarms and some unnecessary responses.

In addition, the prior art's fault response schemes for valve thermostats are not comprehensive

Images