Gas control system and gas control method for non-road gas engine

Abstract

The invention discloses a gas control system of a non-road gas engine and a gas control method thereof. The former includes a mixer, and the mixer is respectively provided with an air inlet, a gas inlet and a mixed gas outlet, and the air inlet is provided with a first pressure sensor , the gas inlet is provided with a second pressure sensor and a pressure regulating valve at intervals, and the gas mixture outlet is provided with a third pressure sensor; the first pressure sensor, the second pressure sensor, the pressure regulating valve and the third pressure sensor are respectively electrically connected to the controller to control The controller controls the opening of the pressure regulating valve according to the pressure information fed back by the first pressure sensor, the second pressure sensor and the third pressure sensor, so as to adjust the air-fuel ratio of the mixture. The system has a simple structure. By adjusting the pressure regulating valve at the gas inlet, the gas pressure entering the mixer is controlled, and the air-fuel ratio required under each working condition is controlled to realize closed-loop control, which makes the air-fuel ratio control range smaller and more accurate. High, improve the transient response rate of the engine.

Description

technical field [0001] The invention relates to the technical field of automobile control, in particular to a gas control system of a non-road gas engine, and also relates to a gas control method of a non-road gas engine including the gas control system. Background technique [0002] Gas engines mainly use LPG (liquefied petroleum gas), natural gas, biomass gas, etc. as fuel, and the main product after combustion is CO 2 , NOx and other gases have little pollution to the environment, and have been widely used as clean power by various countries. The performance of a gas engine mainly depends on the quality of the gas and its mixing provided by the gas supply system. The mixer in the gas supply system has a great impact on engine performance. has an important impact. [0003] At present, the mixers used on non-road gas engines in the prior art are mainly Venturi mixers and proportional mixers. Among them, the Venturi mixer mainly uses the low static pressure of the throat cr...

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Problems solved by technology

[0003] At present, the mixers used on non-road gas engines in the prior art are mainly Venturi mixers and proportional mixers. Among them, the Venturi mixer mainly uses the low static pressure of the throat cross-section to inhale the gas. Mixing, but this kind of mixer not only needs to realize the uniform mixing of gas and air through the relevant size at the throat, but also controls the flow rate of air inlet and outlet, which makes the control accuracy low and difficult to control; the proportional mixer uses air and the pressure difference between the gas and the intake port to adjust the opening of the inner core to control the air-fuel ratio of the mixture, but the control range of this structure is not small enough, and the response speed is slow

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