Anti-surge control method of high-pressure waste gas recycling supercharger of diesel engine

Abstract

The invention discloses an anti-surge control method of a high-pressure waste gas recycling supercharger of a diesel engine. The method includes the steps that 1, an ECU reads air inlet pressure, airinlet temperature and air flow signals of the engine, and the actual pressure ratio and air flow mass flow of the supercharger (1) are calculated; 2, whether the actual pressure ratio exceeds a critical pressure ratio of surge corresponding to the air inlet amount or not is judged, if yes, step 3 is executed, and if not, a waste gas recycling valve (4), a throttle valve (3) and the supercharger donot act; 3, the ECU reads the rotating speed and torque of the engine, and the speed change rate and torque change rate of the engine are calculated; 4, whether the speed change rate and the torque change rate of the engine exceed limit values or not is judged, if yes, step 5 is executed, and if not, the waste gas recycling valve, the throttle valve and the supercharger do not act; 6, the anti-surge state quits. According to the method, the problem of surge of the supercharger during normal running of a diesel vehicle is solved on the premise that emission and performance indexes of the engine are not reduced, and noise and moving caused by surge can be avoided.

Description

technical field [0001] The invention relates to the application field of high-pressure common rail diesel engine calibration, in particular to a control method for anti-surge of a diesel engine equipped with a high-pressure exhaust gas recirculation supercharger. Background technique [0002] On the turbocharger equipped with the current gasoline vehicles, a pressure relief valve is generally installed, and the pressure relief valve is opened under the working conditions that are prone to surge, such as loosening the throttle or climbing a steep drop in speed, so that the air flow does not pass through the compressor impeller. Bypass directly to the pipeline after the supercharger to solve the problem of supercharger surge. As for turbochargers for diesel vehicles, they are generally not equipped with similar pressure relief valve devices; only other methods can be used to solve the problem of turbocharger surge, and the usual methods are: [0003] 1) Reduce the intake pres...

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Problems solved by technology

[0004] 2) Slow down the response of the accelerator to slow down the change of intake air volume and intake pressure. This method will affect the acceleration performance, and slowing down the change of loose throttle torque will also slightly increase fuel consumption.

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