Gas Engine Injection Device Leakage Monitoring Strategy

Abstract

The invention discloses a monitoring strategy for leaking of a jetting device of a gas engine. The monitoring strategy comprises the steps of starting and stopping signal detecting by a fuel cut-off valve, engine state signal detecting, position detecting of a start key of an automobile, logical processing, setting of the pressure safety range of the jetting device, leaking judging of the jetting device and the like. The monitoring strategy has the beneficial effects that 1, original configurations of the engine and the structure of an original gas jetting device do not need to be changed; and 2, through an ECU, the sealing performance of a jetting rail and a nozzle is effectively judged by parameters detected by an existing state monitoring device, and failure prompting is conducted to the leaking problem. The monitoring strategy is used for judging the vehicle condition for a driver, more direct support is provided, accordingly the consistency of the engine state can be monitored, and worsening of power performance, economic performance and emission performance due to gas leaking is avoided.

Description

technical field [0001] The invention relates to the technical field of gas injection pressure monitoring, in particular to a gas engine injection device leakage monitoring strategy. Background technique [0002] At present, for natural gas engines, high-pressure gas rails and single-point injection are generally used. In order to precisely control the injection volume of gas, a certain high-pressure gas must be stored and maintained in the gas rail, and then the opening time of the needle valve inside the nozzle is controlled by electronic control technology to achieve the purpose of controlling the gas volume. However, when the gas in the gas rail leaks, or the nozzle is not closed tightly, the amount of gas injected into the gas channel will be inaccurate. This in turn affects the overall performance of the engine. Since the leakage of the gas rail or nozzle is relatively slight, it is not easy to be detected by the "leakage sensor", but it will have a greater impact on ...

AI Technical Summary

Problems solved by technology

However, when the gas in the gas rail leaks, or the nozzle is not closed tightly, the amount of gas injected into the gas channel will be inaccurate

which in turn affects the overall performance of the engine

Since the leakage of the gas rail or nozzle is relatively slight, it is not easy to be detected by the "leakage sensor", but it will have a greater impact on the normal operation of the engine

There is no method for accurately judging gas leakage in the current control strategy

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