Accelerator Pedal Torque Mapping for ICE-Like EV Deceleration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional powertrain systems in electric vehicles fail to accurately replicate the driving experience of internal combustion engine vehicles by not providing a customizable level of resistive torque when the accelerator pedal is released, leading to a less intuitive driving experience.
Innovation Solution
A controller that determines the position of the accelerator pedal relative to a reference position to adjust torque output using acceleration and deceleration pedal maps, taking into account vehicle speed, gradient, terrain, and state of charge, to emulate the behavior of an internal combustion engine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional powertrain system is used in an electric vehicle, then the vehicle structure is simplified, but the driving experience fails to replicate internal combustion engine behavior accurately
Solution Approach 1:
The controller dynamically adjusts torque output parameters based on accelerator pedal position, vehicle speed, and gradient to replicate internal combustion engine behavior. The system changes torque delivery characteristics across different operating conditions to simulate the non-linear response of ICE vehicles, thereby improving driving experience fidelity without adding physical complexity to the powertrain structure.
2Reliability
If resistive torque is increased to emulate internal combustion engine losses, then the driving experience is improved, but the energy consumption increases
Solution Approach 1:
The controller applies resistive torque selectively based on accelerator pedal position and vehicle operating conditions. Rather than continuously applying maximum resistive torque, the system applies partial torque during deceleration phases and modulates the level of emulation according to the degree of pedal release, thereby improving driving experience fidelity while minimizing unnecessary energy consumption.
3Adaptability or versatility
If multiple pedal maps are used to cover different operating conditions, then the adaptability is improved, but the control system complexity increases
Solution Approach 1:
The controller divides the operating space into distinct regions using multiple pedal maps, each optimized for specific conditions such as acceleration, deceleration, low-speed, and high-speed operations. By segmenting the control strategy into condition-specific maps and selecting the appropriate map based on current operating parameters, the system achieves comprehensive adaptability while keeping the control logic organized and manageable.
Data Source
AI summary
A controller for a vehicle is configured to determine the position of the accelerator pedal with respect to a reference accelerator pedal position (aref); and either determine a torque output in dependence on an acceleration pedal map if the position of the accelerator pedal is greater than the reference accelerator pedal position (aref); and, determine a torque output in dependence on a deceleration pedal map if the position of the accelerator pedal is less than the reference accelerator pedal position (aref).