Method and system for controlling decelerating and deflating process of automobile supercharged gasoline engine and automobile

Abstract

The invention discloses an automobile supercharged gasoline engine deceleration air leakage process control method and system and a vehicle. The method comprises the steps that 1, the current working condition state is judged; if the current working condition state is the rapid deceleration working condition, the engine operates a rapid deceleration working condition control mode; otherwise, the engine operates in a conventional control mode; 2, judging whether a deceleration surge control mode is entered or not; step 3, controlling the supercharger exhaust gas control valve after entering the deceleration surge control mode; 4, throttle valve torque reduction control is carried out after the deceleration surge control mode is started; 5, ignition advance angle torque reduction control is carried out after the surge control mode is entered; whether torque reduction in the speed reduction process meets the drivability target or not is judged, if the drivability target is not met, ignition angle control optimization in the torque reduction process is conducted, and if the drivability target is met, control is ended. On the premise that a supercharger ECRV bypass valve is not needed, the surge risk can be avoided, and the complexity of the system can be reduced.

Description

technical field [0001] The invention relates to the technical field of automobile engine control, in particular to a method, a system and a vehicle for controlling the deceleration and leakage process of an automobile supercharged gasoline engine. Background technique [0002] For engines using supercharging technology, when the turbocharging system is working, the intake pipe is filled with compressed gas. When the throttle is loosened to slow down, the throttle valve will be closed quickly. These high-pressure gases are blocked in front of the throttle valve to cause gas backflow. The impact of high-pressure gas on the blades of the compressor will cause the surge of the supercharger, and in severe cases, the blades of the supercharger will reverse and break off. [0003] In order to solve this problem, the automobile turbocharging system will design a leak bypass valve (that is, ECRV bypass valve) on the outlet path of the compressor. In the deceleration condition, the en...

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Problems solved by technology

[0006] Patent document CN112211735A performs surge control through control strategy optimization, thereby achieving the purpose of canceling the ECRV bypass valve, but it cannot effectively avoid the risk of surge

The patent document CN 105041523B is based on the use of ECRV to optimize the leakage noise through the supercharger pressure casing structure design, ECRV bypass valve layout and the addition of high-frequency resonant cavity technology. Obviously, the problem of leakage noise cannot be solved from the root cause. At the same time, the entire deflation control system is relatively complicated and the cost is relatively high

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