Engine Torque Control via Pressure Ratio and Inverted Models
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional engine control systems fail to accurately control engine torque output, especially at high pressure ratios, and lack rapid response to control signals, leading to complexity and costly calibration processes.
Innovation Solution
A method for controlling internal combustion engine torque output by determining a pressure ratio, calculating a reference torque, and regulating engine operation based on desired throttle area, using inverted torque models and filtering techniques to achieve precise torque control, including rate limiting and correcting for steady-state operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional engine control systems are used, then the system structure is simple, but the torque control accuracy deteriorates especially at high pressure ratios
Solution Approach 1:
The patent transforms the control approach by changing from direct throttle control to pressure ratio-based control. The control system calculates desired throttle area based on pressure ratio and torque request, using inverted torque models that account for pressure ratio effects. This parameter transformation enables accurate torque control across varying pressure conditions without requiring complex adaptive structures.
Solution Approach 2:
The patent introduces pressure ratio as an intermediary parameter between the torque request and throttle control. Instead of directly controlling throttle based on torque demand, the system first determines pressure ratio, then uses it to calculate desired throttle area through inverted torque models. This intermediary approach decouples the control complexity from the control accuracy requirement.
2Speed
If traditional engine control systems are used, then the system structure is simple, but the response speed to control signals deteriorates
Solution Approach 1:
The patent implements preliminary action by pre-calculating desired throttle area based on current pressure ratio and torque request before actual torque control is needed. The inverted torque models are ready to provide immediate throttle area calculations when torque changes are requested, eliminating the need for complex real-time iterative solutions and enabling rapid response.
Solution Approach 2:
The patent replaces traditional mechanical feedback-based torque control with a calculated control approach using inverted torque models. Instead of relying on mechanical sensors and feedback loops to determine throttle position, the system uses mathematical models that directly calculate desired throttle area from pressure ratio and torque request, significantly reducing response time.
3Ease of manufacture
If traditional engine control systems are used, then the calibration process is simple, but the calibration time and cost increase
Solution Approach 1:
The patent enables self-service calibration through automated inversion of torque models. The system automatically generates calibration data by inverting the torque models to determine desired throttle area, MAP, and APC values across operating conditions. This eliminates the need for manual, time-consuming calibration processes while ensuring consistency with the underlying physics models.
Solution Approach 2:
The patent creates a universal calibration approach that works across different operating conditions through the pressure ratio-based control framework. The inverted torque models provide a unified method for determining throttle control across varying pressure ratios, engine speeds, and torque demands, replacing multiple condition-specific calibration procedures with a single comprehensive approach.
Data Source
AI summary
A method of controlling a torque output of an internal combustion engine includes determining a pressure ratio, determining a reference torque based on the pressure ratio and a torque request, calculating a desired throttle area based on the reference torque and regulating operation of the engine based on the desired throttle area to achieve the desired torque.