Method for controlling air input of engine by oxygen sensor signal

Abstract

Disclosed is a control method for engine air input by oxygen sensor signal, which belongs to the technical field of improving the gas mixture air-fuel ratio of motor vehicle engine. The method is characterized in that a controller collects the oxygen sensor signal data based on a target air-fuel ratio preset in the controller, the oxygen sensor signal is amended and compensated reference to the oil injection pulse width signal; active forecast and advance control are performed to different condition target air-fuel ratio and the same condition different target air-fuel ratio through the fuzzy control strategy and quantification calculation and analysis for changed area by a microprocessor, thereby the air demand for engine gas mixture air-fuel ratio under different conditions is automatically adjusted and controlled. the oxygen sensor signal data collected by the controller is input into an engine electronic injection controller after treated by soft measurement, so the oil injection pulse width corrected by the controller is more accurate, thereby achieving the purpose of active forecast and control for given target air-fuel ratio and overcoming a series of hysteresis response brought by time lag, and the control for the air-fuel ratio of the engine is more accurate and reasonable.

Description

technical field [0001] The invention relates to a method for controlling the intake air volume of an engine by an oxygen sensor signal, and belongs to the technical field of improving the air-fuel ratio of a motor vehicle engine mixture. Background technique [0002] The oxygen sensor is installed on the exhaust pipe, and the air-fuel ratio is determined by using the difference between the exhaust gas and the oxygen concentration in the atmosphere; the oxygen sensor outputs different voltage values ​​by detecting the oxygen content in the exhaust gas and inputs it to the ECU corresponding to the theoretical air-fuel ratio. Compared with the standard voltage, the high oxygen content of the exhausted mixed gas indicates that the intake air volume is sufficient, and the intake mixed gas is thin, and the output voltage of the oxygen sensor is low, and vice versa. [0003] In the actual operation of the engine, the working state of the engine will change dynamically. Because the ...

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Problems solved by technology

[0003] In the actual operation of the engine, the working state of the engine will change dynamically. Because the optimized control map of the bench is powerless to the characteristic differences and gradual changes of the actuators and related sensors, and the time lag of signal measurement transmission and execution actions, the use of oxygen The fuel injection pulse width closed-loop control system controlled by sensor signal feedback is always in a passive position and powerless in the target adjustment of the engine's transient air-fuel ratio

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