Air-fuel ratio regulating device and method

Abstract

The invention discloses an air-fuel ratio regulating device and method, belonging to the field of fuel supplying and regulating. The air-fuel ratio regulating device comprises a sensor group, a Flash storage, a PID (proportion integration differentiation) controller, a learning controller, a fuel supplying system and an air-fuel ratio sensor, wherein the sensor group outputs collected corresponding state parameters respectively to the PID controller and the learning controller; and whether a closed loop condition and a learning condition are satisfied is judged by the PID controller and the learning controller according to a current air-fuel ratio value and a target air-fuel ratio value which are output by the air-fuel ratio sensor, and if the conditions are satisfied respectively, a PID corrected value and a learning corrected value are output respectively and act to the fuel supplying system together, thereby realizing the regulation of fuel supplying. By utilizing the air-fuel ratio regulating device and the corresponding regulating method, the regulating precision of the air-fuel ratio is improved, and the fuel utilization ratio is improved further.

Description

technical field [0001] The invention relates to a fuel supply regulating device and its regulating method, in particular to an air-fuel ratio regulating device and its regulating method. Background technique [0002] During the fuel supply process of internal combustion engines, there are differences in the types of natural gas used by internal combustion engines (that is, the content of methane as its main component is different); differences in the operating climate of internal combustion engines; differences caused by assembly errors and production dispersion in the manufacturing process of internal combustion engines ; and the continuous wear, fatigue, and aging differences of components during the use of internal combustion engines, etc., these factors will cause the air-fuel ratio used to indicate the degree of fuel supply to seriously deviate from the target air-fuel ratio. [0003] The traditional fuel supply system only uses PID controller to adjust, such as figure...

AI Technical Summary

Problems solved by technology

However, this kind of adjustment device is adjusted in real time according to the current air-fuel ratio, and the adjustment accuracy is not high

[0004] With the further development of technology, in China PCT Patent Application No. 200880020345.6, an air-fuel ratio control method is proposed, but the learning condition of the learning controller needs to consider the lift of the intake valve (that is, the lift of the intake valve position), this method is only applicable to internal combustion engines with intake valve lifting devices

In addition, two switch-type oxygen sensors with narrow ranges are installed in the air-fuel ratio control device. The target air-fuel ratio of this switch-type oxygen sensor is controlled to be around 1, which is only suitable for equivalence ratio combustion control

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