A fault detection device and method for an exhaust gas recirculation engine

Abstract

The embodiment of the invention provides a fault detection device and method of an exhaust gas recirculation engine. The fault detection device is provided with a first circulation water valve for the recirculation engine, and particularly comprises a controller, the first circulation water valve, a temperature sensor and a processor, wherein the controller is used for closing a recirculation valve and closing the first circulation water valve according to instructions, the first circulation water valve is used for controlling first circulation water to start or stop circulation, the first circulation water is circulation water of a recirculation system, the temperature sensor is used for detecting the temperature of second circulation water after the recirculation valve is closed to obtain a first water temperature, and detecting the temperature of the second circulation water after the first circulation water valve is closed to obtain a second water temperature, the second circulation water is engine circulation water, the processor is used for judging whether the first water temperature is higher than a first threshold value, and if yes, the first circulation water valve is closed according to instructions. Whether the second water temperature is higher than a second threshold value is judged, and if not, the fault type is determined as a recirculation cooler fault.

Description

technical field [0001] The invention relates to the technical field of engine design, in particular to a fault detection device and method for an exhaust gas recirculation engine. Background technique [0002] Exhaust Gas Recirculation (EGR for short) is a method designed for automobile engines. The principle of the EGR engine is that after the engine is burned, part of the exhaust gas is re-inhaled into the engine to reduce the nitrogen oxide content in the exhaust gas and play a certain role in energy saving. In the EGR technology, the cooler (Exhaust Gas Recirculation Cooler, referred to as EGRC) is its key component. Lowering the temperature of recirculated exhaust gas through EGRC can significantly improve the emission reduction effect of nitrogen oxides, and at the same time avoid damage to the EGR control valve due to excessive exhaust gas temperature. [0003] Among EGR engines, a common failure phenomenon is that the temperature of the circulating water of the eng...

AI Technical Summary

Problems solved by technology

[0005] The defect of the existing technology is that not all faults that cause the temperature of the circulating water of the engine to rise, the water temperature must be returned to normal by limiting the torque, and limiting the engine torque will affect the performance of the engine's power performance; so all faults in the prior art are Troubleshooting methods that limit torque, which may unnecessarily reduce engine power and affect normal engine operation

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