Low-pressure gas supercharged engine running mode switching device and switching control method thereof

Abstract

The invention discloses a low-pressure gas supercharged engine running mode switching device. The device comprises an inlet manifold and an exhaust pipe which are mounted on an engine body, the inletmanifold is connected with an air inlet pipe, an air filter, a pressurizer, an intercooler and an electronic throttle valve, the air filter, the pressurizer, the intercooler and the electronic throttle valve are mounted in sequence, a low-pressure gas pipe is further included, a starting mode gas conveying device and a work mode gas conveying device are in parallel connection to the low-pressure gas pipe, the electronic throttle valve, the starting mode gas conveying device and the work mode gas conveying device are connected with a running mode switching control device, and the invention further discloses a switching control method of the device. Under the starting running mode, mixed gas does not pass through the pressurizer and the intercooler, the advancing length of the mixed gas is shortened, the starting time of an engine is greatly shortened, and the starting property is improved. After the engine enters in the work running mode, engine intake can be pressurized, the device issuitable for high-power running, engine self suction and pressurizing mixed use can be achieved, and the running property of the engine is improved.

Description

technical field [0001] The invention relates to the technical field of natural gas engine control, in particular to an operation mode switching device of a low-pressure gas supercharged engine, and also to a specific switching control method used by the switching device. Background technique [0002] Gas engines that use low-pressure gas sources such as biogas, pipeline gas, and gas as fuel have been widely used in power generation stations, petrochemical and aquaculture industries because of their energy-saving and environmentally friendly operation. Low-pressure gas engines are divided into self-priming types. low pressure gas engine and low pressure gas supercharged engine. Among them, the self-priming low-pressure gas engine has better starting performance, but because the intake system is not equipped with a supercharger, the intake pipe pressure is low, resulting in low engine power, which cannot meet the power supply requirements of high-power electrical appliances; ...

AI Technical Summary

Problems solved by technology

Among them, the self-priming low-pressure gas engine has better starting performance, but because the intake system is not equipped with a supercharger, the pressure of the intake pipe is low, resulting in low engine power, which cannot meet the power supply requirements of high-power electrical appliances; while the low-pressure gas booster Although the compressor engine is equipped with a supercharger to meet the electricity demand of high-power electrical appliances, when the gas is in use, it needs to pass through a series of pipelines such as the mixed gas, the supercharger, the intercooler, and the intake manifold to flow into the air. Work is done in the cylinder, and the air supply pipeline is too long, which will easily cause the defect of long start-up time of the low-pressure gas booster engine. When the start-up control strategy is not good, it may even cause difficulty in starting. In addition, due to the influence of the engine operating environment, sometimes even Need to start multiple times in a row to start the engine

Images