Engine Torque Control via Dynamic EGR Ratio Calculation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing control systems for internal combustion engines require extensive manpower to set up numerous maps and tables for calculating torque demand and exhaust gas recirculation ratios, making them complex and inefficient.
Innovation Solution
A control system that calculates the target output torque and exhaust gas recirculation ratio using rotational speed, intake pressure, and actual intake air amount, eliminating the need for multiple maps across various operating conditions, and iteratively adjusts the target intake air amount to match the desired output torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional torque demand control uses multiple maps and tables for calculating torque and exhaust gas recirculation ratio, then calculation accuracy is improved, but device complexity and manpower requirements increase significantly
Solution Approach 1:
The patent changes the calculation parameters from using multiple static maps and tables to using dynamic parameters including actual exhaust gas recirculation ratio, intake air amount, and engine rotational speed. This allows the system to calculate torque demand and exhaust gas recirculation control map values through real-time parameter-based calculations rather than retrieving from pre-set maps, thereby maintaining accuracy while reducing complexity.
2Adaptability or versatility
If conventional systems use extensive maps for various operating conditions, then adaptability to different conditions is improved, but ease of operation and setup time worsen
Solution Approach 1:
The system performs self-service by automatically calculating the exhaust gas recirculation ratio and torque demand based on actual operating parameters (intake air amount, engine speed, throttle opening) without requiring manual setup of multiple maps for different conditions. The control ECU dynamically adapts to various operating conditions through real-time calculation rather than pre-configured maps, significantly reducing setup effort while maintaining adaptability.
3Measurement precision
If conventional torque base control calculates actual output torque using multiple parameters and maps, then measurement precision is improved, but loss of time in setup and calibration increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing the torque demand control map that defines the relationship between torque demand and intake air amount before actual operation. During operation, the system directly uses this pre-established map combined with real-time parameters (actual exhaust gas recirculation ratio, intake air amount, engine speed) to calculate torque demand without requiring time-consuming calibration procedures, thus maintaining accuracy while reducing calibration time.
Data Source
AI summary
A control system for an internal combustion engine having a throttle valve disposed in an intake passage of the engine. A target intake air amount of the engine is calculated, and an intake pressure of the engine is estimated. A wide-open intake air amount is calculated according to the engine rotational speed, and a theoretical intake air amount is calculated according to the wide-open intake air amount and the intake pressure. The wide-open intake air amount is an intake air amount corresponding to a state where the throttle valve is fully opened, and the theoretical intake air amount is an intake air amount corresponding to a state where no exhaust gas of the engine is recirculated to a combustion chamber of the engine. further, an exhaust gas recirculation ratio is calculated using the theoretical intake air amount and the target intake air amount, and a target output torque of the engine is calculated using the target intake air amount and the exhaust gas recirculation ratio. The engine is controlled using the target output torque.