Vehicle Control Device Torque Acceleration Detection
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Solution Overview
Problem
Existing vehicle control systems face challenges in accurately detecting excess acceleration states due to inaccuracies in calculating actual and required torque or acceleration, often caused by abnormalities in control circuits or communication systems, leading to potential omission of detection.
Innovation Solution
A control device that utilizes both torque and acceleration parameters to detect excess acceleration states by calculating required and actual torque and acceleration values, and implementing a fail-safe process to address excess conditions, with independent detection methods to prevent false positives and ensure accurate state monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only torque parameters are used to detect excess acceleration state, then the detection method is simple, but the detection accuracy decreases due to calculation inaccuracies from control circuit or communication system abnormalities
Solution Approach 1:
The detection method is segmented into two independent parallel paths: one using torque parameters (actual torque and required torque) and another using acceleration parameters (actual acceleration and required acceleration). Each path independently detects excess acceleration states, and if either path detects the state, the system determines an excess acceleration state is present. This segmentation ensures that if one path fails due to control circuit or communication abnormalities, the other path can still accurately detect the state.
Solution Approach 2:
The system changes from using a single parameter type (torque) to using multiple independent parameter types (both torque and acceleration). By introducing acceleration as an additional independent parameter for detection, the system overcomes the limitation of torque calculation inaccuracies caused by control circuit or communication system abnormalities, thereby improving detection accuracy.
2Measurement precision
If multiple independent parameters are used to detect excess acceleration state, then the detection accuracy increases, but the device complexity increases
Solution Approach 1:
The control device is designed with multi-functionality by incorporating both torque-based detection and acceleration-based detection capabilities within a single system. The same control device executes both detection methods, sharing common computational resources and control logic, thereby achieving improved detection accuracy without proportionally increasing device complexity.
Solution Approach 2:
The torque-based detection system and acceleration-based detection system are merged into a unified detection framework. Both detection paths feed into a common decision logic that determines whether an excess acceleration state is present. This merging allows the system to leverage multiple independent parameters while maintaining a cohesive and manageable system architecture.
3Speed
If torque-based detection is used, then the detection response is fast, but false detection may occur due to calculation inaccuracies
Solution Approach 1:
The system implements a feedback mechanism where both torque-based detection results and acceleration-based detection results are fed into a unified decision logic. The acceleration-based detection serves as a feedback verification for the torque-based detection, reducing false positives while maintaining fast response speed. If torque-based detection indicates an excess acceleration state, the system cross-checks with acceleration-based detection to confirm before triggering fail-safe measures.
Data Source
AI summary
In a torque-based detection process, a control device detects an excess acceleration state of a vehicle when a duration time of a state in which a value obtained by subtracting a required torque from an actual torque of an internal combustion engine is equal to or greater than a torque threshold value is equal to or greater than a torque determination time. In an acceleration-based detection process, the control device detects the excess acceleration state of the vehicle when a duration time of a state in which a value obtained by subtracting a required acceleration from an actual acceleration of the vehicle is equal to or greater than an acceleration threshold value is equal to or greater than an acceleration determination time.