Compression ignition engine homogeneous combustion control method with temperature in cylinder controlled quantitatively

Abstract

The invention belongs to the field of engine combustion control and relates to a compression ignition engine homogeneous combustion control method with temperature in a cylinder controlled quantitatively. Homogeneous fixed gas is burned, and meanwhile the burning temperature in the cylinder is quantitatively controlled within 2200K, so that the purpose that particles emission and NOx emission are lowered at the same time is achieved. When an engine operates under a working condition that single cylinder oil injection quantity is smaller than or equal to small load, inner EGR is used for improving the temperature in the cylinder, and burning stability is guaranteed. Under the condition that single cylinder oil injection quantity is smaller than or equal to medium load, any temperature control measure is of no need. Under the condition that single cylinder oil injection quantity is smaller than or equal to medium-large load, burning temperature is high, and outer EGR is added to lower the burning temperature in the cylinder. Under the condition that single cylinder oil injection quantity is smaller than or equal to large load, an outer EGR valve is opened completely, and meanwhile the opening degree of a throttle valve is increased, the fresh air inlet amount in the cylinder is increased, and a method that the air inlet amount is increased by outer EGR coupling is used for lowering the burning temperature in the cylinder.

Description

technical field [0001] The invention belongs to the field of engine combustion control, in particular to a homogeneous compression ignition combustion control method for quantitatively controlling the combustion temperature in an engine cylinder. Background technique [0002] With the continuous growth of the number of cars in the world, the harmful substances emitted by cars are increasing day by day, and the resulting environmental problems have attracted more and more attention. Countries have successively issued strict emission regulations to limit the emission of harmful substances from internal combustion engines. . NOx (nitrogen oxides) and PM (particulate matter) are the main harmful substances emitted by compression ignition internal combustion engines. Under the traditional combustion mode, the two emissions have a trade-off relationship (trade-off), that is, reducing one of the emissions often brings Another increase in emissions has become a difficulty in diesel...

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Problems solved by technology

Internal EGR is achieved by changing the timing of the valve, because the exhaust gas is directly recirculated without cooling, which causes the temperature of the mixture to rise

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