If there is a slight leakage in the engine intake manifold, which indicators of exhaust emissions will be affected?
The aeration model of the engine is a very important module in engine calibration, and the intake volume determines the fuel injection amount of the engine. One of the parameters in the inflation model is the manifold pressure, if the manifold leaks, the most intuitive impact is the deviation of the manifold pressure measurement, which affects the calculation of the intake volume and the amount of fuel injection. If the pressure effect on the manifold is a constant value, it is better, just as the high altitude vacuum is low, the engine controller will adjust accordingly. Even if the impact of leakage on manifold pressure is changing, manifold pressure is high and low, and the fuel injection control is adjusted accordingly, coupled with the lag of air-fuel ratio control according to the oxygen sensor feedback, there may be a thin or thick mixture. If it is sparse, Nox will be more, and if it is dense, CO and HC will be more. In addition, manifold leakage, generally accompanied by engine high idle speed, idle jitter and other problems, you can pay attention to whether there are similar phenomena. For the harm of the engine, there was an accident before, the engine pulled the cylinder, and the later investigation was that the manifold had air leakage, just in time for the road condition, there was dust without air filter filtration, and it entered the cylinder, accumulated between the piston ring and the cylinder wall, and the cylinder liner was pulled off.
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