Diesel engine, and air inlet device and air inlet control method for diesel engine

Abstract

The invention discloses an air inlet device of a diesel engine. The air inlet device comprises a supercharger, an intercooler, a diesel engine air inlet tube, a temperature sensor, a diesel engine electronic control unit, an auxiliary air inlet tube and a control valve, wherein an air outlet of the supercharger is communicated with an air inlet of the control valve; a first air outlet of the control valve is communicated with an air inlet of the intercooler; a second air outlet of the control valve is communicated with an air inlet of the auxiliary air inlet tube; an air outlet of the intercooler and an air outlet of the auxiliary air inlet tube are communicated with the diesel engine air inlet tube; and the diesel engine electronic control unit adjusts the air inlet quantity of the auxiliary air inlet tube and the air inlet quantity of the intercooler through the control valve according to signals of the temperature sensor. By the air inlet device of the diesel engine, the air inlet temperature of the diesel engine can be controlled in real time, a burning environment of diesel oil can be improved, a phenomenon of white smoke is relieved, the burning efficiency of the diesel oil is improved, and accordingly the emission level and the economic performance of the diesel engine in cold regions can be improved. The invention further discloses a diesel engine air inlet control method and the diesel engine.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to diesel engines and air intake devices thereof. The invention also relates to the air intake control method of the diesel engine and the air intake device thereof. Background technique [0002] In order to increase power and reduce fuel consumption, a turbocharged diesel engine is equipped with a turbocharger on its intake side. Since the temperature of the exhaust gas discharged from the diesel engine is very high, when the air enters the turbocharger, the heat conduction through the supercharger will increase the temperature of the intake air. [0003] Moreover, the pressure of the air will increase during the process of being compressed, which will inevitably lead to an increase in the temperature of the air, and the intercooler just plays the role of cooling the supercharged high-temperature air, and the high-temperature air passes through the intercooler cooling, and then i...

AI Technical Summary

Problems solved by technology

[0011] (1) The electric intake heating device adopts electric heating. The electrical characteristics limit the heating time and cannot be used for a long time. At the same time, the load of the diesel engine is increased, resulting in an increase in fuel consumption and an increase in the operating cost of the vehicle.

[0012] (2) On the technical level, this method needs to add a new control module, and the control mode is relatively simple. It only adopts the control mode of activation and deactivation, without referring to the actual operating state of the diesel engine, and cannot accurately and effectively adjust the heating state. During the actual operation of the diesel engine, there will still be white smoke

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