A diesel engine air intake control device and control method

Abstract

The invention relates to the technical field of engines, in particular to a diesel engine air inlet control device. The invention provides the diesel engine air inlet control device. The diesel engine air inlet control device comprises a supercharger, an intercooler and an engine, which are connected in sequence through air inlet pipes, wherein a double-pipe heat exchanger is arranged on the air inlet pipe between the intercooler and the engine; a water inlet of the engine communicates with a water outlet of the double-pipe heat exchanger through a water inlet pipe; a water outlet of the engine communicates with a water inlet of the double-pipe heat exchanger through a water outlet pipe; and an electromagnetic valve is arranged on the water outlet pipe. The double-pipe heat exchanger is additionally arranged on the air inlet pipe behind the intercooler of the diesel engine air inlet control device provided by the invention, and a water way leads from the water outlet of the engine to the double-pipe heat exchanger. Through the water way, heat of the engine is fully utilized for convective heat transfer for air inlet temperature behind the intercooler; and the diesel engine air inlet control device has the advantages of being simple in structure and reducing the NOx emission of an entire vehicle according to the requirement of post-treatment exhaust temperature.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a diesel engine air intake control device and control method, in particular to a simple structure and NO x A diesel engine air intake control device and control method with low emission. Background technique [0002] With the increasingly stringent national emission regulations, the reduction of vehicle NO x Emissions are gradually becoming the focus of people's research. For a complete vehicle equipped with an SCR box aftertreatment system, the optimum working temperature of the aftertreatment is generally required to be around 300 °C. The exhaust pipe of the engine is connected with the SCR box. During the actual road driving of the whole vehicle, affected by the road driving conditions and ambient temperature, the average exhaust temperature is relatively low, and the average exhaust temperature of urban passenger cars is even less than 250°C. Therefore, the SCR after-treatm...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the existing method for increasing the intake air temperature during the working process of the engine does not take into account the use of increasing the intake air temperature to reduce vehicle emissions, and the final intake air temperature is controlled by the opening of the solenoid valve, which is very difficult. It is difficult to ensure that the temperature after intercooling can reach the expected control target, and there is still the problem of uneven mixing of cold and hot gases

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