Self-adaptation ionic current detecting device

Abstract

The invention provides a self-adaptation ionic current detecting device which comprises an ignition isolation module, a high-voltage isolation module, a bias power supply module, a voltage dividing module, a signal preprocessing module and a variable resistance module. One end of the ignition isolation module is connected with an ignition module of an engine, and the other end of the ignition isolation module is connected with the input end of an ignition plug of the engine and is connected with one end of the high-voltage isolation module. The other end of the high-voltage isolation module is connected with a positive electrode of the bias power supply module. A negative electrode of the bias power supply module is connected with one end of the voltage dividing module. The other end of the voltage dividing module is connected with the output end of the variable resistance module which is provided with an engine combustion mode control signal receiving end, and the output end of the voltage dividing module is connected with the input end of the signal preprocessing module. The self-adaptation ionic current detecting device can carry out effective isolation on interference from ignition, high voltage, a background and the like, self adaptation on engine SI / SCCI mode switching is achieved, and the ionic current of an internal combustion engine cylinder inner combustion state can be detected accurately and completely in real time.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engines, and relates to a device for detecting the combustion state of the internal combustion engine. Background technique [0002] The combustion process of the engine depends on the comprehensive effects of the physics and chemistry of the mixture in the cylinder. In order to control the combustion process of the engine, a real-time feedback signal is needed to determine the combustion state. The ion current signal contains a large amount of information about combustion and operation in the cylinder of the engine. Through signal collection and processing, the required combustion information can be obtained and used for closed-loop control of the combustion process. The size of the ion current is related to the instantaneous local ion concentration, and the size of the local ion concentration depends on the ability of the combustion chemical reaction in the cylinder to generate ions ...

AI Technical Summary

Problems solved by technology

Since the spark plug is used as the ion current sensor, the ignition discharge interference will inevitably significantly affect the ion current signal waveform

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