Pseudo Shifter Reaction Force Control for Manual EV Gear Feel
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Solution Overview
Problem
Existing technologies for reproducing manual gear changing operations in electric vehicles lack sufficient reproducibility, potentially causing discomfort for drivers seeking the experience of manipulating a manual transmission vehicle.
Innovation Solution
An electric vehicle is designed with a motor as the driving source, incorporating a pseudo shifter, pseudo clutch, detector, reaction force generator, and controller. The controller calculates a virtual differential rotation speed based on detected operations and wheel rotation speed, determining a reaction force for the pseudo shifter to mimic the experience of gear changing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pseudo shifter is used to mimic gear changing operations in an electric vehicle, then the driver experience is improved, but the reaction force reproducibility is insufficient
Solution Approach 1:
The system uses detectors to monitor accelerator operations, pseudo shifter positions, pseudo clutch operations, and wheel rotation speeds, then feeds this information back to the controller which calculates virtual differential rotation speed and determines appropriate reaction forces. This closed-loop feedback mechanism ensures accurate reproduction of manual transmission reaction forces, resolving the contradiction between improved driver experience and insufficient reaction force reproducibility.
Solution Approach 2:
The patent replaces the actual mechanical engine and transmission system with a motor-driven system that uses virtual calculations. The controller substitutes physical mechanical feedback with calculated virtual differential rotation speed based on detector inputs, then generates appropriate reaction forces through the pseudo shifter mechanism. This substitution allows accurate reaction force reproduction without requiring an actual engine, resolving the reliability issue while maintaining driver experience.
2Measurement precision
If virtual differential rotation speed is calculated based on multiple detection results, then the accuracy of reaction force determination is improved, but the system complexity increases
Solution Approach 1:
The controller performs multiple functions using a single integrated system: it detects accelerator operations, pseudo shifter positions, pseudo clutch operations, and wheel rotation speeds; calculates virtual engine rotation speed; determines virtual differential rotation speed; and controls reaction force generation. This multi-functional approach improves measurement precision through comprehensive data collection while avoiding the need for separate dedicated systems for each function, thus managing system complexity.
Solution Approach 2:
The patent introduces virtual differential rotation speed as an intermediary calculated parameter that mediates between multiple detection inputs and the final reaction force output. Rather than directly processing multiple detection results, the system uses this virtual parameter as an intermediate step, simplifying the overall control logic while maintaining high accuracy in reaction force determination.
Data Source
AI summary
An electric vehicle including a motor as a driving source includes: an accelerator; a pseudo shifter mimicking a gear changing operation; a pseudo clutch mimicking a clutch operation; a detector detecting an operation mode performed on each of the accelerator, pseudo shifter, and pseudo clutch by a driver, and a rotation speed of a driving wheel; a reaction force generator generating a reaction force in the pseudo shifter in response to a driver operation performed thereon; and a controller determining the reaction force. The controller includes a processor and a memory coupled thereto. The processor calculates a virtual differential rotation speed that is based on a virtual engine rotation speed, mimicking an engine rotation speed when the driving source is assumed as being an engine, and the rotation speed based on a detection result of the detector, and determines the reaction force based on the virtual differential rotation speed.