A device and method for reducing emissions of a supercharged diesel engine based on intake air composition control

Abstract

The invention discloses a device for reducing emission of a supercharged diesel engine based on intake component control. The device mainly comprises a diesel engine, an air system and an intake way water spraying system. The air system consists of a two-grade turbocharger, an EGR valve, a waste gas recirculation pipeline, an intercooler, a one-way valve, an intake main pipe, an intake manifold, an exhaust main pipe, an exhaust manifold and the like; the intake way water spraying system comprises a water storage tank, a high-pressure water pump, a needle valve nozzle and an intake pipe water spraying electric control system main control chip; and when the device is used for controlling, the openness of the EGR valve and the water spraying quantity of the needle valve nozzle are flexibly controlled according to the operation working condition characteristics of the engine and an original emission target, so that the ratio of waste gas and water in intake components to a fresh charging quantity is changed, the control of the intake components is realized, the NOx emission is reduced, the adverse effect on the acting capacity and the working efficiency of a two-grade supercharging system by EGR introduction is greatly reduced, and the efficient cleaning combustion range of the supercharged diesel engine is effectively widened.

Description

Technical field [0001] The invention relates to a device and method for reducing the emission of a supercharged diesel engine based on intake composition control, specifically designing a coupling control device using high-pressure EGR and intake water injection to adjust an exhaust gas recirculation (EGR) valve according to the requirements of different working conditions The degree of opening and the amount of water injection change the intake air composition to achieve efficient and clean combustion of the turbocharged diesel engine. Background technique [0002] Faced with the continuous upgrade of emission regulations, the NOx limit of diesel engines is almost close to zero, which poses a greater challenge to emission control. At present, the main measures to reduce NOx generation on diesel engines include: exhaust gas recirculation (EGR), water-blended combustion technology, and exhaust gas aftertreatment. [0003] Due to the limitation of the conversion efficiency, cost and...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this technology is that low-pressure EGR usually introduces the exhaust gas behind the vortex to the front of the compressor, mixes it with fresh charge, and then enters the intake pipe after being compressed by the compressor. The exhaust gas will cause certain corrosion to the compressor, etc., affecting reliability and durability. sex

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