System device for controlling combustion noise of common rail engine under transient condition

Abstract

Disclosed is a systematic device for controlling combustion noise of a common rail engine in transient operating conditions. The solution of this device lies in: an engine secondary supercharging power circulation system is formed by connecting the engine, a turbocharger, an intercooler, a one-way valve and an intake mixer in sequence. An exhaust branch of the engine is connected to an EGR cooler, and a gas side outlet of the cooler is connected to the intake mixer of the engine. Air in a high-pressure air storage tank is connected into the engine intake mixer via a high-pressure electromagnetic valve. The control method comprises four steps as follows: obtaining an accelerator pedal accelerating signal, estimating the degree of opening of an EGR vacuum valve according to state parameters, estimating the supercharging degree according to the current intake state, and adjusting the EGR valve and controlling a duty cycle signal. The intake and fuel injection processes are controlled in the engine transient accelerating process, insofar as the increment of engine power in the engine transient condition is not reduced, the pressure rising ratio is reduced, the temperature of a cylinder wall of the engine is increased, and the noise caused by the transient accelerated combustion of the engine is effectively lowered.

Description

technical field [0001] The invention belongs to engine combustion technology, and mainly relates to a system device and method for controlling noise generated by engine transient combustion. Background technique [0002] Diesel engine fuel injection technology has undergone two techniques of manipulating fuel injection, mechanical and electronic, and the common rail engine has been applied to the control of diesel engine fuel injection. As we all know, the noise emitted by a diesel engine increases significantly when it is running and accelerating. This is mainly due to the fact that the wall temperature of the combustion chamber under transient conditions is lower than that under steady conditions, resulting in longer ignition delay periods, pressure rise rates and high-frequency pressure oscillations. caused by the increase. [0003] The study found that the wall temperature of the supercharging "constant speed increasing torque" transient working condition is significant...

AI Technical Summary

Problems solved by technology

As we all know, the noise emitted by a diesel engine increases significantly when it is running and accelerating. This is mainly due to the fact that the wall temperature of the combustion chamber under transient conditions is lower than that under steady conditions, resulting in longer ignition delay periods, pressure rise rates and high-frequency pressure oscillations. caused by increase

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