EV Shift Indicator Guidance to Prevent Virtual Speed Limit Cutoff
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electric vehicles in manual shift mode face unintended power cutoffs due to virtual engine speed reaching a speed limit, similar to internal combustion engine vehicles, which can disrupt driving performance.
Innovation Solution
A method is introduced to guide vehicle shift timing by using a shift indicator that provides visual cues to the driver through light emitting elements on the instrument panel, based on virtual engine speed and predicted speed limit arrival time, to prevent power cutoffs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the virtual engine speed is maintained close to the speed limit to maintain maximum driving force, then the driving force of the vehicle is maintained at a high value, but unintended power cutoff occurs when the virtual engine speed reaches the speed limit
Solution Approach 1:
The shift indicator provides advance warning to the driver before the virtual engine speed reaches the speed limit, enabling the driver to shift gears proactively. This preliminary notification prevents the harmful power cutoff effect by allowing timely intervention before the critical threshold is reached.
Solution Approach 2:
The system continuously monitors the virtual engine speed and provides real-time feedback through the shift indicator when approaching the speed limit. This feedback loop enables the driver to adjust shifting behavior based on current system state, preventing power cutoff while maintaining optimal driving force.
2Loss of information
If the shift indicator provides continuous visual notification to guide manual shift timing, then the driver can recognize appropriate shift timing, but the device complexity increases
Solution Approach 1:
The shift indicator uses localized light emitting elements positioned specifically on the instrument panel to provide shift timing information. By concentrating the notification function in a specific visual location rather than using multiple distributed indicators, the system reduces overall complexity while effectively communicating critical timing information to the driver.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively informs the driver of appropriate shift timing, preventing unintended power cutoffs and enhancing driving performance by allowing the driver to shift gears before reaching the virtual speed limit.
Implementation Method 1
the shift indicator may include light emitting elements provided on an instrument panel inside the electric vehicle
Data Source
AI summary
A method of guiding vehicle shift timing which may provide information related to the shift timing to a driver includes determining, by a controller, a virtual engine speed of an electric vehicle, determining, by the controller, a predicted speed limit arrival time taken for the determined virtual engine speed to reach a predetermined speed limit, controlling, by the controller, operation of a shift indicator configured to guide manual shift timing based on the determined virtual engine speed and predicted speed limit arrival time, and operating, by the controller, the shift indicator to provide shift timing information to the driver.