One-Pedal Drive Grade Compensation for Smooth Ramp Transitions
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Solution Overview
Problem
Hybrid/electric vehicles with one-pedal drive systems face challenges in maintaining a natural driving experience when transitioning over graded surfaces due to overcompensation of torque compensation, particularly when wheels on different axles enter or exit ramps at varying rates.
Innovation Solution
A controller adjusts torque compensation by reducing the rate of change when it exceeds a threshold, ensuring that the vehicle maintains a natural driving experience by preventing overcompensation during grade transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If ramp compensation torque is increased to maintain driving stability on graded surfaces, then vehicle stability is improved, but torque overcompensation occurs causing unnatural driving experience
Solution Approach 1:
The controller dynamically adjusts the ramp compensation torque based on real-time detection of wheel position on the ramp and rate of change of torque. When the rate of increase exceeds a threshold, the controller reduces the compensation torque to prevent overcompensation. This dynamic adjustment allows the system to maintain stability while avoiding unnatural driving sensations during grade transitions.
Solution Approach 2:
The system implements feedback control by monitoring the rate of change of ramp compensation torque and comparing it against a threshold. When the rate exceeds the threshold, the controller responds by reducing the compensation torque. This feedback mechanism ensures that torque compensation remains within natural driving parameters while maintaining vehicle stability on graded surfaces.
2Speed
If ramp compensation torque is adjusted rapidly to respond to grade changes, then response speed is improved, but torque突变 occurs causing driving discomfort
Solution Approach 1:
The system dynamically adapts the torque compensation rate based on current operating conditions. When wheels are transitioning onto or off the ramp, the controller monitors the rate of torque change and adjusts compensation accordingly. This dynamic approach enables rapid response to grade changes while preventing abrupt torque changes that would cause driver discomfort.
Solution Approach 2:
The controller anticipates potential torque突变 by monitoring wheel position and ramp conditions before they occur. When a rapid grade change is detected, the system preemptively adjusts the torque compensation rate to remain within comfortable thresholds, cushioning the driver from experiencing abrupt torque changes while maintaining responsive vehicle behavior.
Data Source
AI summary
A vehicle includes an electric machine that propels the vehicle, and a controller that, while wheels of only one axle of the vehicle are on a ramp being entered and climbed by the vehicle and a first ramp compensation torque is being commanded to the electric machine, reduces the first ramp compensation torque responsive to a rate of increase of the first ramp compensation torque exceeding a first rate threshold.