Method for controlling protection and detection of leakage of spraying nozzles of gas engine

Abstract

The invention discloses a method for controlling protection and detection of leakage of spraying nozzles of a gas engine. The method for controlling protection and detection of leakage of the spraying nozzles of the gas engine is cooperatively completed by utilizing an ECU mounted on a car. The method includes the steps that a standard quantitive slope factor is set, a gas pressure decreasing slope factor is calculated and compared with the standard quantitive slope factor, after an engine oxygen sensor closed loop is activated, a fuel spraying adaptive value in an idling area is forced to be cleaned automatically, an inner-outer leakage meter quantity is set, and a deviation and the set inner-outer leakage meter quantity are compared and judged. The method has the advantages that 1, leakage judging of the spraying nozzles is automatically conducted under the situation that using of the engine for a user is not affected ; 2, leveled treatment is conducted according to the severity degree of a failure when the ECU judges that the leakage failure happens on the spraying nozzles, so that a failure action and protection are conducted; 3, after the engine is started again, a failure light is lightened up to remind a driver that a relevant failure of the spraying nozzles exists; 4, the serial number of the failed spraying nozzle and a failure mode (inner leakage / outer leakage) can be accurately judged, and the user and a repairman are guided to repair; and 5, detection can be conducted repeatedly after repair to prevent recurrence of the failure.

Description

technical field [0001] The invention relates to the technical field of gas engine nozzle monitoring, in particular to a control method for gas engine nozzle leakage protection and detection. Background technique [0002] Commercial natural gas engines mostly use general-purpose gas nozzles for passenger cars, and their reliability cannot meet the operating conditions of commercial vehicles. Nozzle leakage will destroy the engine air-fuel ratio control, causing abnormal combustion in the cylinder, resulting in worsening emissions, engine damage, and even fires that endanger personal safety. The existing gas engine control system can only judge whether the nozzle power supply is open or disconnected, but cannot judge whether the nozzle is leaking, and cannot judge and protect the nozzle leakage fault. In addition, the existing gas nozzle diagnosis and control method can only be forced to stop the work of a certain nozzle. Observe whether the nozzle is invalid. It is impossibl...

AI Technical Summary

Problems solved by technology

[0002] Commercial natural gas engines mostly use general-purpose gas nozzles for passenger cars, and their reliability is difficult to meet the operating conditions of commercial vehicles

Nozzle leakage will destroy the engine air-fuel ratio control, causing abnormal combustion in the cylinder, resulting in worsening emissions, engine damage, and even fire hazards that endanger personal safety

The existing gas engine control system can only judge whether the nozzle power supply is open or disconnected, but cannot judge whether the nozzle is leaking, and cannot judge and protect the nozzle leakage fault. In addition, the existing gas nozzle diagnosis and control method can only be forced to stop the work of a certain nozzle. Observe whether the nozzle is invalid. It is impossible to judge the nozzle leakage. Therefore, when the nozzle leaks, it is difficult to quickly judge the leak point, which makes the inspection and maintenance of the nozzle take a long time.

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