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

A technology of exhaust gas recirculation and control method, which is applied in the direction of electrical control, engine control, fuel injection control, etc., which can solve problems such as increased fuel consumption, slowing down of changes in intake air volume and intake pressure, and affecting acceleration performance. Intake resistance, noise and movement avoidance, surge avoidance effects

Active Publication Date: 2018-12-07
SAIC MOTOR
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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

Method used

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

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Example Embodiment

[0072] Example 1:

[0073] Please see attached image 3 , with image 3 It is a typical arrangement of the intake and exhaust system of diesel engines above the national five. Considering reducing NOx emissions and increasing the EGR rate, pursuing higher engine torque output, usually sets a higher target pressure on the supercharger, which increases the risk of supercharger surge, especially in some torque and speed surges. drop under transient conditions.

[0074] Use the signal of the intake pressure sensor to get the inlet pressure P 21 =1880hPa and air mass flow dmAir=170kg / h, the outlet pressure P of the supercharger compressor is calculated according to the pipeline pressure model 20 =1904hPa; similarly use the ambient pressure P 0 =1009hPa and air mass flow dmAir=170kg / h, the inlet pressure P of the supercharger is calculated according to the pipeline pressure model 1 =1001hPa, and finally get the actual pressure ratio of the supercharger CR=P 20 / P 1 =1.887. ...

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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...

Claims

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Application Information

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IPC IPC(8): F02D41/00
CPCF02D41/0007F02D41/0047F02D2041/0022
Inventor 牛文杰高柏濬张立峰辛海东沈轶
Owner SAIC MOTOR
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