Engine Torque Control via Actual Torque Feedback
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Solution Overview
Problem
Conventional torque-based engine control methods face challenges in accurately calculating high-response demand torque due to limitations in low-response demand torque calculation, which affects the overall accuracy and responsiveness of engine torque control.
Innovation Solution
An engine controlling apparatus that includes units for detecting engine speed and acceleration operation, calculating acceleration demand torque, external demand torque, and target torques for ignition timing and intake air control, allowing for precise control of ignition timing based on actual and target torques to enhance calculation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If high-response demand torque is calculated based on low-response demand torque estimated in low-response torque control, then the torque behavior can be controlled through two kinds of controls with different responsibilities, but the calculation accuracy of high-response demand torque cannot be ensured
Solution Approach 1:
The patent introduces feedback by calculating actual torque based on detected engine parameters (intake air amount, engine speed, charging efficiency) and using this actual torque as feedback to correct the high-response demand torque calculation. This feedback mechanism ensures that the calculated torques reflect the actual engine state, thereby improving calculation accuracy while maintaining the dual-control structure.
Solution Approach 2:
The patent segments the torque control into independent calculation paths: low-response demand torque based on driver and external demands, and high-response demand torque based on actual torque feedback. This segmentation allows each control path to be optimized independently, with the high-response path using actual torque measurements to ensure accuracy without being constrained by the limitations of low-response torque estimation.
2Device complexity
If low-response demand torque is calculated based on driver demand torque and external demand torque without considering actual torque, then the control structure remains simple, but the calculation accuracy is limited
Solution Approach 1:
The patent adds feedback by incorporating actual torque (calculated from detected engine parameters) into the high-response demand torque calculation. This feedback loop improves accuracy without significantly increasing overall system complexity, as the actual torque calculation uses existing sensor data (intake air amount, engine speed, charging efficiency) already available in the control system.
Solution Approach 2:
The control system achieves multi-functionality by using a single actual torque calculation based on existing sensors to serve both the low-response and high-response torque control paths. This universal approach improves both control paths' accuracy without requiring separate measurement systems, thereby limiting the increase in device complexity.
Data Source
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AI summary
An engine controlling apparatus includes an engine speed detection unit (6) that detects an engine speed, and an acceleration operation amount detection unit (5) that detects an acceleration operation amount inputted to an acceleration pedal. The apparatus includes a first calculation unit (2a) that calculates an acceleration demand torque based on the engine speed and the acceleration operation amount, a second calculation unit (2e) that calculates an external demand torque demanded from an external controlling system, and a third calculation unit (2k) that calculates a first target torque and a second target torque based on the acceleration demand torque and the external demand torque. The apparatus includes a fourth calculation unit (4c) that calculates a maximum torque which can be generated by the engine at an actual charging efficiency, and a control unit (1) that controls an ignition timing of the engine based on the actual torque and the first target torque.