Engine Combustion Information Observation and ECU Online Realization Method Based on Acoustic Signal

Abstract

The invention discloses a combustion information observation and on-line implementation method for an engine ECU (electronic control unit) based on an acoustic signal. The method mainly comprises the following steps: acquiring the range of an acoustic signal combustion observation characteristic frequency band; building an engine combustion state discrimination model based on the acoustic signal; building an engine combustion phase observation model based on the acoustic signal; and dynamically processing the acoustic signal of an engine on line in real time to obtain a current combustion state and a current combustion phase of the engine. By defining and extracting the acoustic signal combustion observation characteristic frequency band, the signal to noise ratio of an original acoustic signal is improved, the characteristic quantity of the acoustic signal is defined at the acoustic signal combustion observation characteristic frequency band, a mathematic model between the characteristic quantity of the acoustic signal and cylinder inner combustion information is built, the combustion information observation and on-line implementation method based on the acoustic signal is provided on the basis of an architecture of concurrently processing software and hardware resources, and a practical solution is provided for an actual requirement on observation of the combustion information of the engine through an ECU.

Description

technical field [0001] The invention relates to a combustion process observation method in an engine cylinder, in particular to an acoustic signal-based combustion information observation method for an engine ECU and an online implementation method thereof. Background technique [0002] The composition of fuel oil produced by different origins and refining processes often changes, resulting in changes in the physical and chemical properties of the fuel. Affected by the energy crisis, research on various alternative fuels has been rapidly developed and gradually applied to actual engines. The specialized characteristics of alternative combustion and standard fuels are often significantly different. The key performance parameters of the actuators of the fuel system will change with the change of life during use. The change of the combustion system itself under different environmental parameters and its own life will also cause changes in performance parameters. [0003] Clea...

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Problems solved by technology

[0008] The above research status preliminarily reveals the possibility of using acoustic signals to observe the abnormal combustion state and combustion parameters in the cylinder, but it does not define and establish a mathematical model between the acoustic signal and engine combustion information, and its research ideas are still Limited to off-line analysis, which limits the application value of the combustion information observation method based on acoustic signals

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