Solenoid valve diagnosis detecting method and device for electric-controlled co-rail fuel feed pump

Abstract

The invention relates to a diagnosis and detection method and a device for an electromagnetic valve used for an electrically controlled common rail fuel feed pump. The method is characterized in that control parameters predetermined by test is input by a monitor program, current waveform during the drive of the electromagnetic valve is detected in real time and curve fitting is conducted; accordingly, the characteristics of the electromagnetic valve are judged, the movement circumstances when turning-on and shutting-down of the electromagnetic valve delays are measured and then whether the electromagnetic valve has the fault of deadlocking or open circuit can be analyzed. When the electromagnetic valve diagnosis and detection device is in use, no fuel injection pump test stand is needed; the use of the device can improve the consistence of the performance of the fuel feed pump electromagnetic valve, thereby greatly improving the performance and reliability of a common rail fuel injection system. The electromagnetic valve detection device has the advantages of low manufacture cost, convenient use, good self-diagnostic function and easy implementation in mass production.

Description

technical field [0001] The invention relates to a method and a device for diagnosing and detecting an electromagnetic valve for an electronically controlled common rail system of a diesel engine, in particular to a method and a device for diagnosing and detecting an electromagnetic valve for an electronically controlled common rail oil supply pump. Background technique [0002] The solenoid valve for the high-pressure oil supply pump of the common rail system is an outward-opening solenoid valve. By changing the oil supply starting point of the oil supply pump, the oil supply volume of the plunger of the oil supply pump is controlled to achieve the purpose of controlling the common rail pressure of the system. The switching times of the solenoid valve of the fuel supply pump during work are directly proportional to the speed of the high-pressure fuel supply pump of the engine. Therefore, the solenoid valve needs to withstand the impact of high-frequency pulse current and mech...

AI Technical Summary

Problems solved by technology

At the same time, the solenoid valve is also a key component of the common rail injection system, and its performance directly affects the pressure control and stability of the common rail system, which in turn affects the performance of the engine.

[0003] Among the existing patents on electronically controlled common rail injection systems for diesel engines, there are many patents on diagnosis and judgment standards for solenoid valves of electronically controlled fuel injectors. For example, Chinese patent CN1450452A discloses a method and device for running-in diagnosis of switch solenoid valves for electronically controlled diesel engines. , this method proposes a diagnosis and judgment method and device for the high-speed and powerful solenoid valve of the fuel injector, and judges whether the solenoid valve meets the performance requirements according to the current value within a specific period of time, but the current waveform characteristics of the solenoid valve involved in this method are not obvious, and cannot Judging the action of the solenoid valve from the current waveform

In addition, Japanese patent JP11013519 also discloses a fuel injector drive control and a diagnostic method for the drive device, which uses the current value of the solenoid valve within a specified time to judge whether the solenoid valve meets the performance requirements of the fuel injector. The diagnostic circuit is added, so that the fault judgment of the driving device itself can be carried out; but this method is also for the analysis of the solenoid valve of the fuel injector, and the characteristic points of the driving current waveform of the solenoid valve of the fuel injector are not obvious, and it is also impossible to judge from the waveform Therefore, these diagnostic methods are not suitable for the diagnosis and detection of solenoid valves for electronically controlled common rail fuel pumps.

Images