A four-stroke ignition type hydrogen-oxygen engine and its control method

Abstract

The invention provides a four-stroke spark ignition type hydrogen-oxygen engine and a control method, and particularly relates to a hydrogen and oxygen supply system and oxygen injection and combustion process control of the four-stroke spark ignition type hydrogen-oxygen engine. According to the system, on the basis of keeping main components of an original engine, an electronic control unit (4),an oxygen tank (6) and an oxygen nozzle (9) are additionally mounted. The electronic control unit (4) can calculate the injection pulse width, the injection phase position, the number of times of injection and the ignition angle of the oxygen nozzle according to a needed power signal (c), and therefore the engine can control oxygen to be injected into a cylinder to form layered mixed gas layeredbased on an oxidization agent, the output power can be controlled by adjusting the injection pulse width of the oxygen nozzle, then the opening degree of an electric control throttle can be increasedto the greatest extent so as to reduce gas injection losses, and the effective efficiency can be improved. According to the system, the oxygen in-cylinder direct injection technology is adopted, and the tempering hidden danger brought by pre-mixing outside a hydrogen cylinder and the oxygen cylinder is avoided.

Description

technical field [0001] The invention provides a four-stroke ignition engine and a control method using pure hydrogen and pure oxygen as working fluids, and specifically relates to a hydrogen and oxygen supply system, oxygen injection and combustion process control of a four-stroke ignition hydrogen-oxygen engine. Background technique [0002] The power system of spacecraft and other devices uses liquid hydrogen as fuel, and converts liquid hydrogen into gaseous hydrogen for use in fuel cells. Since the liquid hydrogen storage device is only concerned with hydrogen leakage, and excess hydrogen will be discharged during the operation of the fuel cell, there is a large amount of residual hydrogen in the device using the above power scheme. Since this part of the remaining hydrogen is in a low-pressure state, it is difficult to be re-pressurized and introduced into the fuel cell for use, and the re-pressurization of this part of the hydrogen requires the compressor to consume ad...

AI Technical Summary

Problems solved by technology

[0005] In view of the immature technology of engines using pure hydrogen and pure oxygen as working fluids, the premixing of hydrogen and oxygen in the gas supply system brings the risk of flashback, and the combustion of engines with fixed mole fractions of hydrogen and oxygen has low efficiency, mechanical load and thermal load high problem, the present invention provides a novel four-stroke ignition hydrogen-oxygen engine and its control method

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