Apparatus for controlling discharge of hydrogen internal combustion engine by thermal exhaust recirculation

Abstract

The invention relates to a device for controlling hydrogen discharged by an internal combustion engine by thermal exhaust recirculation. An engine control unit receives position sensor signals of a crank shaft, a cam shaft and an accelerator in real time, calculates rotating speed, ignited cylinder and load, obtains an initial value of the concentration of mixed gas through table lookup, and uses feedback of an oxygen sensor to correct the initial value to obtain final concentration of the mixed gas. When the concentration of the mixed gas is less than 0.5, an exhaust recirculation valve is not opened, and an air throttle is still kept at a fullly-open position. When the concentration of the mixed gas is more than 0.5, the exhaust recirculation valve is quickly opened to the largest position, and the opening angle of the air throttle is reduced at the same time to reduce the amount of introduced air. Along with the increase of the load, the hydrogen injection amount is gradually increased, the air throttle returns to the fullly-open position, and the exhaust recirculation valve also gradually reduces opening degree, so that the concentration of the mixed gas is equal to or thicker than the stoichiometric proportion. When exhaust flow flows through a three-way catalyst, redundant hydrogen and nitrogen oxides in waste gas are subjected to oxidation-reduction reaction to further reduce discharge.

Description

technical field [0001] The invention relates to an emission control system of a hydrogen engine, in particular to reducing the nitrogen oxide emission of a hydrogen internal combustion engine by using a hot exhaust gas recirculation device. Background technique [0002] With tightening emissions regulations and pressure from dwindling petroleum fuels, internal combustion engine researchers have been looking for clean, recyclable alternatives. In addition, as the issue of global warming has attracted more and more attention, it has become the consensus of all countries to reduce greenhouse gas emissions such as carbon dioxide. In recent years, the research work on hydrogen internal combustion engine has been carried out extensively in the world. [0003] In an internal combustion engine that uses hydrogen as fuel, the product of complete combustion is water, which does not produce carbon dioxide emissions at all, and does not have pollutants such as CO, HC, and soot produced...

AI Technical Summary

Problems solved by technology

But in a hydrogen internal combustion engine, the cooled recirculated exhaust gas causes a large amount of water to condense, which not only causes problems with drainage, but also complicates the engine system, and leads to more serious parts corrosion and oil deterioration

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