Abstract
In order to realize fully flexible variable valve lift and improve the intake efficiency of the engine, a new electromagnetic valve-train (EMVT) was designed to replace the traditional CAM in the engine valve-train. However, as the durability of electromagnetic linear actuator (ELA) in the EMVT was lower than that of CAM, and there might be some problems during a long running time. This paper presented an improved online fault diagnosis method combining BP Neural Networks with Grey Relation Analysis (GRA) to analyze current signals, which could realize the monitoring, diagnosis of electromagnetic linear actuator faults and early warning so as to prevent unnecessary situations such as accidental cylinder stop of the engine. The results showed that this method had a high fault diagnosis rate, high speed, reliability and practicability.
Highlights
The development of engine valve-train has gone through three stages: conventional CAM drive valve-train, variable CAM drive valve-train and camless drive valve-train
In the conventional CAM drive engine, the valve movement was driven by the CAM mechanism, and the valve movement is fixed relative to the crankshaft Angle
It could be seen from Eq (2) that the resistance of the actuator directly affected Im, this was good for determining faults, so this paper put Im as the first characteristic parameter for on-line monitoring and fault diagnosis of electromagnetic linear actuator (ELA)
Summary
The development of engine valve-train has gone through three stages: conventional CAM drive valve-train, variable CAM drive valve-train and camless drive valve-train. This paper adopted the improved artificial neural network method to monitor the motion state and predict fault in advance of electromagnetic linear actuator, and made the recognition rate and training speed of the optimized system greatly improved. This method was conducive to realtime online monitoring and improving the defects of previous fault diagnosis work. This method only needed to analyze the current signal acquisition of actuators, do not needed other sensor signals, which was benefit of simplifying the system structure, reducing cost, improving reliability and had a high practicability and application prospect It could provide powerful guarantee for the application of electromagnetic drive valve-train, routine maintenance and detection of the vehicles.
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