High-speed gasoline engine instantaneous condition air-fuel ratio control method

Abstract

The invention discloses a high-speed gasoline engine instantaneous condition air-fuel ratio control method. The high-speed gasoline engine instantaneous condition air-fuel ratio control method comprises the following steps of acquiring gasoline engine instantaneous condition parameters, determining the key influence factors influencing instantaneous air-fuel control through multi-parameter sensitivity analysis, and building an intake air flow predication model; building a fuel oil dynamic flow model according to dynamic flow characteristics, spray characteristics and the evaporation rate of anoil atomizer; building an air-fuel ratio predication algorithm through the intake air flow predication model and the fuel oil dynamic flow model; correcting an intake air flow prediction model through an oxygen sensor feedback control algorithm; carrying out model training optimization to obtain instantaneous air-fuel ratio control strategy; calculating oil atomizer oil injection pulse width according to the set target air-fuel ratio, and using the oil injection pulse width as an oil injection instruction to carry out oil injection actions; and repeating the steps. With the high-speed gasoline engine instantaneous condition air-fuel ratio control method, variation trend of intake air flow can be predicated quickly and accurately on the high-speed gasoline engine instantaneous conditions,accurate control over the instantaneous air-fuel ratio is effectively achieved, emission is reduced, and the good dynamic property is guaranteed at the same time.

Description

technical field [0001] The invention relates to the technical field of engine electronic control, in particular to a method for controlling the air-fuel ratio of a high-speed gasoline engine under transient conditions. Background technique [0002] In recent years, with the increasingly serious problems of environmental pollution and energy scarcity, emission regulations have become more and more stringent. In order to solve the increasingly serious emission problems, high-speed gasoline engines have been developing towards the direction of electronic injection and gradually reduce the use of traditional carburetors. For the increasingly stringent emission regulations, the solution is still based on the three-way catalytic converter, and the use of the three-way catalytic converter needs to control the air-fuel ratio near the theoretical air-fuel ratio. In the actual use of high-speed gasoline engines, most of the cases are in the transient condition of the throttle opening...

AI Technical Summary

Problems solved by technology

If a single traditional oxygen sensor feedback control is used, the air-fuel ratio will seriously deviate from the theoretical air-fuel ratio under transient conditions, which will not only reduce the power performance of the engine, but also affect the efficiency of the three-way catalytic converter and worsen emissions

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