A compound injection hydrogen engine and its control method

Abstract

The invention relates to a composite hydrogen injection engine and a control method, in particular to a composite injection hydrogen engine and a control method combining intake port injection and in-cylinder direct injection. The engine includes intake system, high-pressure hydrogen supply system, low-pressure hydrogen supply system, in-cylinder water injection system and electronic control system. According to the engine power requirements and working conditions, the proportion of direct injection hydrogen and hydrogen injection in the inlet port is adjusted, and the opening of the valve valve is adjusted to control the intake air volume, thereby controlling the power output of the engine. The ECU judges the crankshaft position and speed through the crankshaft position sensor and the speed sensor, and judges the occurrence of knocking according to the signal of the knock sensor. According to the knock signal, the water pump pressure and the injection pulse width of the sprinkler are adjusted to control abnormal combustion problems such as early ignition, backfiring and knocking. The engine and the control method can realize the flexible adjustment characteristics of the engine, and can eliminate the knocking of the hydrogen engine, reduce the emission of nitrogen oxides, and improve the efficiency of the hydrogen engine.

Description

technical field [0001] A compound injection hydrogen engine and a control method, in particular to a spark ignition engine combining intake port hydrogen injection and in-cylinder hydrogen injection, and a control method, belonging to the field of internal combustion engines. Background technique [0002] In recent years, with the rapid expansion of car ownership, my country's transportation industry is facing increasing pressures of "carbon peaking" and "carbon neutrality", and the combustion of fossil fuels in automobile engines will also lead to the emission of various pollutants , resulting in increasingly prominent environmental problems, the development of alternative fuel technology is receiving extensive attention. [0003] Hydrogen is a renewable fuel with a wide range of sources and can be produced by electrolysis of water, which can play a regulating role of "shaving peaks and flat valleys". Hydrogen has excellent combustion characteristics, such as short quenchin...

AI Technical Summary

Problems solved by technology

The technology to control abnormal combustion mainly adopts the EGR (exhaust gas recirculation) strategy, but the EGR strategy will cause the intake air temperature to rise, reduce the cylinder volumetric efficiency, and lead to a decrease in power and efficiency

Previous researchers proposed the strategy of directly injecting hydrogen into the cylinder to eliminate the backfire problem. Due to the high injection pressure, the hydrogen cylinder pressure cannot continue to meet the hydrogen supply requirements after the hydrogen injection pressure is reduced. In the same hydrogen storage In-cylinder direct injection reduces driving mileage compared with port injection

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