Intake Parameter Calculation for Internal Combustion Engines
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Solution Overview
Problem
Existing intake parameter-calculating devices for internal combustion engines fail to accurately calculate intake parameters, particularly under transient operating conditions where the degree of opening of the intake throttle valve changes, due to neglecting the throttle valve's opening state.
Innovation Solution
An intake parameter-calculating device that calculates intake parameters by using basic intake parameters, first and second opening function values, and correction values based on the degree of opening of the intake throttle valve, incorporating a model equation and correlation model to reflect the throttle valve's state and correct for modeling errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the intake parameter is calculated using only the intake system model without considering the throttle valve opening degree, then the calculation process is simple, but the calculation accuracy deteriorates especially under transient operating conditions
Solution Approach 1:
The patent introduces the throttle valve opening degree as a new parameter to the calculation model. By changing the calculation approach from using only fixed system models to dynamically incorporating the throttle valve opening parameter, the system achieves higher accuracy under transient conditions while maintaining reasonable computational complexity through structured integration of the new parameter into existing calculation frameworks
2Ease of manufacture
If the intake parameter is calculated using the intake system model derived from equation of state, then the calculation can be performed with basic sensors, but the calculation accuracy deteriorates when the throttle valve opening changes frequently
Solution Approach 1:
The patent implements a feedback mechanism by continuously incorporating the throttle valve opening degree detection into the intake parameter calculation. The system uses the detected opening degree to dynamically adjust the calculation results, creating a closed-loop approach that maintains high accuracy even when the throttle valve opening changes frequently, while preserving the simplicity of using basic sensors through efficient parameter integration
Data Source
AI summary
To provide an intake parameter-calculating device and intake parameter-calculating method for an internal combustion engine, which are capable of accurately calculating intake parameters in a case where an intake throttle valve is provided. The intake parameter-calculating device 1 includes an ECU 2. The ECU 2 calculates an error KTHERRCOR using an error model equation (8) (step 2), and calculates a correction coefficient KTHCOR as the reciprocal of the sum of the error KTHERRCOR and 1 (step 3). The ECU 2 calculates a passing air amount GAIRTH by correcting a basic passing air amount GAIRTHN calculated by an equation (11) using a correction coefficient KTHCOR (step 6). A model parameter A for the error model equation (8) is calculated using equations (14) to (18) by onboard identifying calculation with uniform weighting (steps 48 to 53).