Vehicle Torque Request Adaptation for CAN Delay Compensation
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Solution Overview
Problem
Conventional vehicle torque control systems experience sub-optimal performance due to variable CAN delays caused by environmental conditions and component wear, leading to issues like poor response and durability, particularly in automatic transmissions.
Innovation Solution
A torque response adaptation system that adjusts torque response delays and magnitudes based on actual CAN delays and environmental conditions, using a torque requestor module to generate modified torque requests, ensuring smoother shift operations and improved vehicle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a predetermined CAN delay (e.g., worst-possible CAN delay) is used in torque control, then the system ensures reliable operation under all conditions, but the response performance becomes sub-optimal and clunky
Solution Approach 1:
The system dynamically adapts the torque response delay based on actual measured CAN delays rather than using a fixed predetermined value. The torque requestor module continuously monitors the actual CAN delay and adjusts the torque response delay accordingly, allowing the system to optimize response speed while maintaining reliability under varying environmental conditions
Solution Approach 2:
The system implements feedback by measuring the actual CAN delay and using this information to adjust the torque response delay. The torque requestor module receives feedback about the actual communication delay and modifies its torque requests to compensate, thereby optimizing response performance while ensuring reliable operation
2Device complexity
If a fixed torque response delay is used, then the control system is simple to implement, but it cannot adapt to environmental variations such as temperature and altitude
Solution Approach 1:
The system performs self-adjustment by automatically measuring its own CAN delay and adapting the torque response delay without requiring external calibration or complex configuration. The torque requestor module autonomously monitors communication delays and adjusts its behavior accordingly, enabling the system to adapt to environmental variations while maintaining relatively simple control logic
Solution Approach 2:
The system changes the torque response delay parameter based on measured actual CAN delay. By dynamically adjusting this parameter according to environmental conditions and communication performance, the system achieves adaptability without requiring complete redesign of the control architecture
3Ease of manufacture
If predetermined torque control parameters are used, then the system is easy to calibrate, but it results in poor durability and sub-optimal performance under varying conditions
Solution Approach 1:
The system performs preliminary measurement of the actual CAN delay to determine the appropriate torque response delay before executing torque control operations. By measuring and adapting parameters in advance based on actual system behavior, the system ensures optimal and durable performance under varying conditions while maintaining relatively simple calibration procedures
Data Source
AI summary
A torque response adaptation system for a vehicle includes an engine control module (ECM) and a torque requestor module connected to the ECM via a controller area network (CAN) and configured to determine at least one of a torque response delay adaptation and a torque response magnitude adaptation, wherein the torque response delay and magnitude adaptations corresponds to a time delay and a magnitude difference, respectively, between a torque request provided to the ECM via the CAN and a corresponding torque response returned from the ECM via the CAN, generate a modified torque request for the ECM based on the at least one of the torque response delay adaptation and the torque response magnitude adaptation, and transmit, to the ECM via the CAN, the modified torque request, wherein receipt of the modified torque request by the ECM causes the ECM to increase performance of the vehicle.