Vehicle Accelerator Grip Reaction Force Control
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Solution Overview
Problem
Existing vehicle control systems, such as those described in prior art documents, often adjust engine torque based on transverse acceleration without considering the rider's intention, leading to decreased drivability and stability issues when traveling in curves.
Innovation Solution
A vehicle system that includes a motor, an output adjustment device, a reaction force adjustor, and a controller to detect acceleration and adjust the reaction force applied to the driver, allowing the driver to recognize and voluntarily adjust the vehicle's output for stable travel, using a friction circle and torque calculations to determine appropriate acceleration limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If engine torque is automatically adjusted based on transverse acceleration, then vehicle stability is improved, but drivability decreases because the adjustment does not consider rider intention
Solution Approach 1:
The system applies feedback by adjusting the reaction force on the output adjustment device based on detected transverse acceleration. This provides tactile feedback to the rider about vehicle stability conditions, allowing the rider to voluntarily adjust engine torque output while maintaining stability through the feedback mechanism rather than forced automatic control
Solution Approach 2:
The rider themselves performs the torque adjustment by operating the output adjustment device (e.g., throttle) in response to the feedback reaction force. The system enables self-service control where the rider's own actions, guided by feedback, maintain vehicle stability rather than the system imposing automatic torque changes
2Stability of the object's composition
If reaction force is increased to inhibit excessive acceleration, then vehicle stability is improved, but driver comfort deteriorates due to excessive resistance
Solution Approach 1:
The reaction force is applied partially rather than fully - it is adjusted based on the detected transverse acceleration to provide just enough feedback to guide the rider's input without creating excessive resistance. The force magnitude is modulated to be proportional to the instability condition rather than a fixed maximum value
Solution Approach 2:
The reaction force parameter is dynamically changed based on detected acceleration conditions. The system adjusts the magnitude of the reaction force according to the level of transverse acceleration, increasing resistance only when instability is detected and reducing it when the vehicle is stable, rather than maintaining constant resistance
Data Source
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AI summary
A rotation speed of an engine detected by a rotation speed sensor, a change gear ratio detected by a change gear ratio sensor, a roll angle of a body detected by a roll angle sensor and a content of operation of a setting switch by a driver are supplied to a CPU of an ECU. Further, an accelerator opening detected by an accelerator opening sensor of an accelerator grip device is supplied to the CPU of the ECU. The CPU adjusts reaction force applied from the accelerator grip device to the driver by controlling a motor of the accelerator grip device.