System and method for automatically judging fuel gas compositions

Abstract

The invention discloses a system and a method for automatically judging fuel gas compositions. The system for automatically judging the fuel gas compositions comprises an engine fuel gas tank, a liquid level sensor, a fuel gas pressure regulator, a nozzle gas rail assembly, a mixer, an exhaust oxygen sensor and an electric control unit (ECU). The liquid level sensor is arranged on the engine fuelgas tank and is used for monitoring a liquid level in the engine fuel gas tank; the fuel gas pressure regulator is used for regulating the pressure of fuel gas; the nozzle gas rail assembly communicates with the other end of the fuel gas pressure regulator; the mixer is used for receiving the fuel gas injected by the nozzle and conveying the fuel gas into an engine gas cylinder; and the exhaust oxygen sensor is used for monitoring the current exhaust concentration and recording the fuel gas injection closed-loop amount. Therefore, according to the system for automatically judging the fuel gascompositions provided by the invention, the fuel gas compositions can be on-line judged automatically, and the engine fuel injection calculation, the air-fuel ratio concentration calculation and engine ignition advance angle control are regulated in real time, so that the emission performance and the economical efficiency of an engine are ensured.

Description

technical field [0001] The invention relates to the field of gas engines, in particular to a system and method for automatically judging gas components. Background technique [0002] In actual use, the composition of gas varies with different areas of use. For example, the gas source in Guangdong contains more than 95% methane, while the gas source in southern Xinjiang may only contain 75% methane and 8% ethane. [0003] Gas composition has a relatively large impact on the performance and emissions of gas engines. Currently, gas engines have several measures to adapt to different gas compositions. The first is to provide engine calibration data based on the gas composition provided by local gas stations. , mainly used for urban public transport; the second is to calibrate according to the vehicle gas composition with the lowest methane content to ensure safety, and is mainly used for long-distance trucks; the third is to install a knock monitoring system to adapt to differen...

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Problems solved by technology

[0004] The above three measures all have shortcomings. The first measure needs to be calibrated according to the schedule components, and the workload is heavy, and it cannot be effectively dealt with when the local imported gas source changes; The best performance and emissions; the third option is to install a detonation system, which is expensive

[0005] At present, there is no system and method for the online engine to automatically determine the gas composition in the actual application of the engine

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