EV Drive Torque Damping Control for Vibration-Responsive Acceleration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing drive systems for electric vehicles face challenges in reducing vibration-induced unintended acceleration and deceleration, as conventional filtering methods fail to distinguish between intentional and unintentional accelerator pedal actuation, leading to jerky drivetrain responsiveness.
Innovation Solution
A method and system that determine an error between a torque command signal and a damped torque command signal, reducing damping when the error exceeds a threshold based on vehicle resonant frequency, using lookup tables to control damping rates, thereby differentiating between intentional and unintentional pedal movements and smoothing torque application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional filtering methods are applied to torque command signals, then vibration-induced unintended acceleration is reduced, but intentional driver inputs are also dampened causing jerky drivetrain responsiveness
Solution Approach 1:
The damping factor is dynamically adjusted based on the error magnitude between filtered and unfiltered torque commands. When error exceeds threshold, damping is reduced to allow rapid response to intentional inputs; when error is small, damping is maintained to filter vibrations. This dynamic adaptation resolves the contradiction between filtering effectiveness and responsiveness.
Solution Approach 2:
The system changes the damping parameter conditionally based on error threshold comparison. The damping factor transitions between high and low states depending on whether the error between filtered and unfiltered torque commands exceeds a predetermined threshold, allowing the system to adapt its filtering strength to current operating conditions.
2Reliability
If high damping is applied to torque command signal, then unintended pedal actuation is reduced, but rapid response to intentional driver inputs is delayed
Solution Approach 1:
The damping level transitions dynamically between high and low states based on real-time error monitoring. When the error between filtered and unfiltered torque commands exceeds the threshold, the system switches to low damping for rapid response; otherwise, high damping is maintained for reliability. This dynamic switching resolves the speed-reliability contradiction.
Solution Approach 2:
The system preemptively reduces damping when error exceeds threshold, preparing the system for potential intentional driver inputs before they fully manifest. This preliminary anti-action prevents delayed response while maintaining reliability during normal filtered operation.
3Speed
If damping is reduced to improve response speed, then intentional driver inputs are responded to rapidly, but vibration-induced torque fluctuations increase
Solution Approach 1:
The damping parameter is changed conditionally based on error threshold comparison. The system maintains high damping (filtering) when error is small to reduce torque fluctuations, and switches to low damping when error exceeds threshold to improve response speed. This conditional parameter change resolves the contradiction between smoothing and responsiveness.
Data Source
Figure 1
Figure 2~3
AI summary
A drive system and method of control. The method includes reducing damping of a damped torque command signal when an error between a torque command signal and the damped torque command signal exceeds a threshold amount. Torque is provided with a torque source of the drive system based on the damped torque command signal.