Transient EGR control method based on neural network

Abstract

The invention aims at providing a transient EGR control method based on a neural network. The cyclic oil supplying amount is calculated according to the current work condition of a diesel engine, then a cyclic oil supplying amount signal is transmitted to a target oxygen content calculating unit which works out a target oxygen content value A under the work condition, and A is transmitted to a PI controller unit; and the BP neural network predicts a predicted oxygen content in a scavenge air collection pipe of the diesel engine, the oxygen content value is fed back to the PI controller unit, the target oxygen content value A is compared with the fed-back predicted oxygen content in the scavenge air collection pipe to make a difference, an EGR valve opening degree signal is acquired through the PI controller unit and is transmitted to an executing mechanism of an EGR valve and the BP neutral network, and finally, the EGR valve opening degree is made stable. By means of the transient EGR control method based on the neural network, a series of problems caused when traditional PI feedback is controlled at a transient mode switching and under a TierIII mode, an oxygen content sensor seriously lags behind at the time of transient load increasing and decreasing can be well solved.

Description

technical field [0001] The invention relates to an energy saving and emission reduction method, in particular to a marine diesel engine energy saving and emission reduction method. Background technique [0002] With the enhancement of people's awareness of environmental protection, countries around the world have formulated corresponding emission regulations. Exhaust emissions from marine diesel engines are one of the main sources of air pollution. The International Maritime Organization (IMO) has put forward increasingly stringent requirements on the emissions of marine diesel engines. Up to now, TierIII emission regulations in specific emission control areas have been officially implemented. NOx emissions It is required to reduce 76% on the basis of Tier II, which brings more severe challenges to marine diesel engine researchers. As an in-engine purification technology, EGR reduces the oxygen content in it by introducing part of the exhaust gas into the scavenging manifol...

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Problems solved by technology

[0003] The object of the present invention is to provide and can effectively improve traditional PI feedback regulation because the oxygen content stabilization time in the scavenging gas manifold that the severe hysteresis of the oxygen content sensor causes becomes longer, and adjustment difficulty increases, and the inevitable overshoot of EGR valve opening degree and A neural network-based transient EGR control method for a series of problems such as the oxygen content in the scavenging header is too low for a certain period of time, black smoke, power and economy decline, etc.

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