Method for controlling electric exhaust gas bypass valve of turbocharged engine

Abstract

The invention relates to a method for controlling an electric exhaust gas bypass valve of a turbocharged engine. The method comprises the following steps: judging whether the operating condition of the engine is in a full supercharge mode or not; if yes, firstly controlling the exhaust gas bypass valve to be closed, and controlling the intake pressure of the engine by controllingvalve phase timing; if the operating condition of the engine is in a non-full pressurization mode, when intake pressure is smaller than basic supercharge pressure, controlling the electric exhaust gas bypass valve of the turbocharged engine to be fully opened, and carrying out the load control by adjusting the degree of the opening of an electronic throttle valve, and when the intake pressure is larger than supercharge pressure, controlling the electronic throttle valve to be fully opened, and carrying out the load control by adjusting the degree of the opening of the electric exhaust gas bypass valve. On the basis of an electric torque structure model, under a certain working condition, the transient response can be improved by closing the exhaust gas bypass valve preferably, and the unstable control of the torque of the turbocharged engine is avoided at the same time.

Description

technical field [0001] The invention relates to the field of new energy electric vehicles and internal combustion engines, relates to the control of a turbocharged wastegate valve, and in particular to an engine load electronic control method with an electric wastegate valve. Background technique [0002] As an environmentally friendly product with high efficiency, energy saving and high technology content, turbocharger can improve the exhaust pollution of automobile engine, improve the power and weight ratio of the engine, improve the torque characteristics of the engine, reduce fuel consumption and engine noise, etc. Advantages, in recent years, turbocharged engine technology has been more and more applied to become modern cars. [0003] The operating conditions of modern automobiles are complex, and there are high requirements for the operating conditions of the engine. It is necessary for the engine to operate in a wide speed and load range with high power and fuel econo...

AI Technical Summary

Problems solved by technology

[0007] In summary, there are the following technical problems in the prior art: turbocharged engine wastegate, including two control modes of pneumatic control and electric control, the existing control strategy is to rely on the current intake pressure to control the wastegate. The opening of the valve is controlled, but at a certain opening of the wastegate, the boost pressure is not proportional to the opening of the wastegate, and the boost pressure suddenly rises, causing the engine to work unstable.

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