Vehicle Acceleration Control Torque Reliability Compensation
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Solution Overview
Problem
Existing acceleration control systems for vehicles face performance degradation due to disturbances such as temperature changes and computing limits, leading to decreased accuracy in feed-forward control and subsequent acceleration control performance.
Innovation Solution
An acceleration control apparatus that incorporates a calculating portion to assess the reliability of input torque and a correcting portion to increase feedback control gain, thereby compensating for accuracy decreases in feed-forward control by adjusting the feedback torque based on reliability calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If feed-forward control is used for acceleration control, then response speed is improved, but accuracy decreases when input torque reliability is low
Solution Approach 1:
The patent implements feedback control that monitors actual vehicle acceleration and compares it with target acceleration. When the difference exceeds a threshold, the system generates correction torque to adjust the feed-forward control output. This feedback mechanism compensates for accuracy losses in feed-forward control while maintaining its fast response characteristics.
Solution Approach 2:
The system dynamically adjusts the gain parameter of the feedback control based on the reliability of input torque. When input torque reliability is low (indicated by low degree of reliability), the feedback gain is increased to compensate for potential inaccuracies. This parameter adaptation allows the system to maintain high accuracy across varying operating conditions while preserving the rapid response of feed-forward control.
2Measurement precision
If feedback control gain is increased to compensate for low reliability, then accuracy is improved, but system stability may deteriorate
Solution Approach 1:
The feedback gain is not fixed but dynamically adjusted based on the degree of reliability of input torque. The system transitions from a static gain approach to a dynamic gain approach, where the gain increases only when reliability decreases and returns to normal when reliability is high. This dynamic adaptation prevents excessive gain that would cause instability while ensuring sufficient gain when accuracy is needed.
Solution Approach 2:
The system changes the feedback gain parameter adaptively based on operating conditions and input reliability. By modulating the gain parameter rather than using a fixed high value, the system achieves high accuracy when needed while maintaining stability during normal operations. The gain adjustment is smooth and controlled, avoiding abrupt changes that could destabilize the system.
3Reliability
If disturbance compensation is implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent uses a feedback mechanism that leverages existing system components (acceleration sensors, torque sensors, ECU) to monitor and compensate for disturbances. Rather than adding complex disturbance observation apparatus, the system uses software-based feedback control that processes data from existing sensors to detect and correct for disturbances affecting input torque reliability.
Solution Approach 2:
The system performs self-diagnosis and self-correction by monitoring its own performance through feedback. The ECU automatically adjusts feedback gain and generates correction torque based on detected reliability levels, without requiring external intervention or complex additional hardware. The system serves itself by using its own operational data to maintain reliability.
Data Source
AI summary
A reliability for a power-train feed-forward torque may be decreased when a degree of reliability for an estimated braking torque is decreased due to disturbance factors. A power-train feedback torque is corrected based on a degree of reliability for a power-train torque, for which a reliability for a braking condition is taken into account. In a similar manner, a brake feedback torque is corrected based on a degree of reliability for a braking torque, for which a reliability for a power-train condition is taken into account. Accordingly, it is possible to compensate the decrease of reliability for the power-train feed-forward torque or brake feed-forward torque by the correction for the power-train feedback torque or the brake feedback torque.