Intake Air Flow Correction Using Pulsation Frequency Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing control techniques for internal combustion engines fail to accurately correct detection errors in flow sensors due to pulsations in intake air, leading to deteriorated control accuracy of fuel injection and ignition timing, and increased exhaust gas properties and fuel consumption.
Innovation Solution
An electronic control device that calculates intake air flow rates using a flow rate measurement device, and corrects the flow rates based on average, maximum, and minimum values, along with amplitude information of specific frequency components in the output signal, to improve detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If correction based on pulsation amplitude alone is used, then the detection error of the flow sensor is corrected under normal conditions, but the correction becomes insufficient under various pulsation conditions leading to deteriorated control accuracy
Solution Approach 1:
The invention changes the parameters used for correction from only pulsation amplitude to include both pulsation amplitude and frequency components. By analyzing multiple frequency components (fundamental frequency and higher harmonics) in addition to amplitude, the correction system adapts to various pulsation conditions occurring during internal combustion engine operation, thereby maintaining measurement precision across different operating conditions.
2Ease of operation
If flow sensor detection is used without comprehensive correction, then the system operation is simple, but the control accuracy of fuel injection amount and ignition timing deteriorates
Solution Approach 1:
The invention implements a feedback-based correction system that continuously analyzes the output signal of the flow sensor, extracts pulsation characteristics (amplitude and frequency components), and applies appropriate correction values. This feedback mechanism automatically adjusts the correction based on detected pulsation conditions, maintaining high measurement precision without requiring manual intervention or complex operational procedures.
3Measurement precision
If pulsation correction is applied, then the flow sensor detection accuracy is improved, but the system complexity increases due to additional correction calculations
Solution Approach 1:
The invention replaces complex hardware modifications with signal processing and computational methods. By using electronic analysis of the flow sensor output signal to extract pulsation characteristics and applying software-based correction algorithms, the system achieves high measurement accuracy without adding mechanical complexity or requiring additional physical sensors in the intake system.
Data Source
AI summary
An electronic control device includes: a flow rate calculation unit that calculates a flow rate of intake air based on an output signal of a flow rate measurement device assembled to an intake pipe; a flow rate correction value calculation unit that calculates an average value, a maximum value, and a minimum value of the flow rate of the intake air, calculated by the flow rate calculation unit, during a predetermined period, and an amplitude of a signal with one or more frequencies equal to or higher than a fundamental frequency of the output signal of the flow rate measurement device and included in the output signal of the flow rate measurement device, and calculates a correction value for the flow rate of the intake air based on calculation results; and a flow rate correction unit that corrects the flow rate of the intake air based on the correction value.