Method for predicting gasoline engine spark advance angle based on gray system theory

Abstract

A method for predicting a gasoline engine spark advance angle based on the gray system theory belongs to the technical field of the control of an engine spark advance angle. The method comprises the following steps: regularly and continuously sampling cooling water temperature T (0) (k) of the petrol engine, inlet temperature t (0) (k) of the gasoline engine, rotating speed n (0) (k) of the throttle percentage gasoline engine, and air-fuel ratio lambda (0) (k) of the gasoline engine under a continuous working condition; taking initialized spark advance angle Beta' (0) (k) as a reference sequence of grey association analysis; carrying out one-step gray accumulating generation on the spark advance angle Beta (0) (k) to obtain gray one-step accumulating generation sequence Beta (1) (k) of the spark advance angle Beta (0) (k); and building gray single-argument first-order predicting models of all gasoline engine factor sequences influencing the spark advance angle. By adopting the gray system theory, the optimum spark advance angle can be actively predicted; and the storage space can be saved and the precision and the efficiency of the work of the spark control system can be improved by taking the advantages of little prediction data quantity and high short-term prediction accuracy of the grey system.

Description

technical field [0001] The invention relates to a method for predicting the ignition advance angle of a gasoline engine based on gray system prediction theory. The invention belongs to the technical field of engine ignition advance angle control. Background technique [0002] In a gasoline engine, the mixture in the cylinder is ignited by high-voltage electric sparks, and the generation of electric sparks is controlled by the ignition system, and the ignition time must match the working conditions of the engine. First of all, the ignition system should ignite according to the working order of the engine cylinders, and secondly, it must be ignited at the best time. The best ignition time is mainly considered from the engine to obtain maximum power and minimum fuel consumption. In modern engine control, it is also considered based on improving combustion conditions, avoiding knocking and reducing harmful gas emissions. The ignition advance angles of different engines are di...

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Problems solved by technology

[0008] 1. Regardless of the working conditions of the engine, various influencing factors are considered, which increases the working intensity of the micro-processing unit, and it is easy to ignore the role of the main influencing factors;

[0009] 2. The mathematical model used is difficult to simulate the actual working conditions of the engine, and a large number of expert databases increases the cost of the storage unit

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