Engine fuel correction control method

Abstract

The invention relates to the technical field of automobile electronics, and provides an engine fuel correction control method. The method comprises the following steps of S1, detecting whether the engine currently meets a fuel correction enabling condition; S2, if the detection result is yes, entering the fuel correction, determining a correction amount and a correction rate of the fuel injectionquantity based on an oil injection closed-loop adjustment coefficient, and correcting the initial fuel value under the current working condition of the engine through the correction of the fuel injection quantity; and S3, when exiting fuel correction, updating the fuel value correction value at the exit moment to the initial fuel value under the current working condition. The control method has the following benefical effects that the latest fuel value learned under each working condition is stored in a self-learning unit corresponding to the working condition, when the engine runs to a similar working condition next time, the last stored fuel correction value can be used as a self-learning initial fuel value, the air-fuel ratio can be adjusted to the vicinity of a theoretical air-fuel ratio more quickly on the basis of last self-learning, and air-fuel ratio self-learning control can be completed through the above process.

Description

Technical field [0001] The invention relates to the technical field of automobile electronics, and provides an engine fuel correction control method. Background technique [0002] With the gradual implementation of National VI emission regulations, my country's regulations on automobile exhaust emissions are becoming increasingly stringent. The engine air-fuel ratio has a vital influence on emissions. Therefore, in the engine electronic control system, the air-fuel ratio closed-loop control function is very important. It can control the actual air-fuel ratio near the theoretical air-fuel ratio 14.7 through real-time correction of fuel injection (quantity), and the catalytic converter has the highest conversion efficiency. However, due to vehicle manufacturing dispersion and fuel injector aging, there is a large deviation in the fuel injection volume. If the injection is still in accordance with the established fuel injection volume, the actual air-fuel ratio will deviate from 14...

AI Technical Summary

Problems solved by technology

In other working conditions, the interpolation method is used for approximate calculation, so not only the learning speed is slow, but also the correction value will often be biased, which will worsen the fuel injection result and cause worse emissions

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