Vehicle Drive Control System for Consistent Acceleration Feel
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Solution Overview
Problem
Existing vehicle drive control systems experience variations in driving feel due to external factors like temperature changes, leading to discomfort for drivers, as they struggle to maintain consistent acceleration and responsiveness.
Innovation Solution
A drive control system that includes an actuator, an output sensor, and a control device which sets a target output value by adding a delay time to the requested output value, ensuring the actuator operates based on its response characteristic, thereby reducing feel variations and enhancing driving comfort by masking delays within the cognitive limit of the driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If tracking control is performed to reach target vehicle acceleration, then acceleration responsiveness is improved, but driving feel varies due to external causes such as temperature changes
Solution Approach 1:
The control device performs advance compensation control by calculating the difference between target acceleration and predicted actual acceleration, then applies corrective torque to the drive motor before the acceleration deviation becomes noticeable to the driver. This preliminary corrective action maintains consistent driving feel despite temperature variations affecting actuator performance.
Solution Approach 2:
The system continuously monitors actual acceleration via sensors, compares it with target acceleration, and adjusts drive motor torque in real-time through feedback control. This closed-loop control compensates for temperature-induced performance changes in the actuator, maintaining reliable and consistent driving feel across varying environmental conditions.
2Speed
If drive motor is used for torque assistance to compensate acceleration insufficiency, then acceleration feel is improved, but driving feel varies when temperature of drive motor changes
Solution Approach 1:
The control device adjusts drive motor torque based on detected temperature conditions and predicted actuator performance characteristics. By dynamically changing control parameters (torque commands) according to temperature-induced actuator performance changes, the system maintains stable driving feel across varying thermal conditions.
Solution Approach 2:
Temperature sensors monitor drive motor temperature, and the control device uses this feedback to adjust torque assistance levels. When temperature changes affect actuator output, the feedback loop compensates by modifying drive motor torque to maintain consistent acceleration feel for the driver.
3Speed
If target output value is set without delay for immediate response, then responsiveness is maximized, but cognitive discomfort occurs when delay exceeds cognitive limit
Solution Approach 1:
The control device calculates and applies compensation torque in advance based on predicted acceleration deviations, so that corrective actions are already in place before any noticeable delay or discomfort occurs. This preliminary corrective action ensures the driver perceives smooth, natural acceleration without cognitive discomfort.
Solution Approach 2:
The system performs advance compensation control by predicting future acceleration deviations and applying counteracting torque before the deviation becomes harmful or noticeable to the driver. This preliminary anti-action prevents cognitive discomfort by eliminating acceleration inconsistencies before they affect driving feel.
Data Source
AI summary
A drive control system is provided, which is mounted on a vehicle configured to travel by operation of a driver. The drive control system includes an actuator configured to output a driving force for the vehicle to travel, an output sensor configured to detect a driving force requested by the operation of the driver, and a control device configured to control operation of the actuator based on the requested driving force detected by the output sensor. The control device sets a target output value by adding a given delay time to a requested output value set corresponding to the requested driving force, and controls the actuator so as to output the target output value based on a response characteristic of the actuator.