One-Pedal EV Control for Smooth Low-Speed Stopping
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Solution Overview
Problem
Existing electric vehicle control systems face challenges in smoothly stopping the vehicle in low-speed zones using one-pedal feedback control, as the target acceleration is low, making it difficult to follow the target value and resulting in potential difficulties in stopping the vehicle smoothly.
Innovation Solution
A control device and method that combines one-pedal feedback control based on acceleration and speed to decelerate the vehicle, using both acceleration and speed-based feedback controls to achieve a smooth stop by calculating and applying a vehicle stop maintenance torque that matches the road surface resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one-pedal feedback control based on acceleration is executed in the low speed zone, then the control system maintains simplicity, but the vehicle cannot stop smoothly because the target acceleration is too low to follow
Solution Approach 1:
The control system dynamically switches between acceleration-based feedback control and speed-based feedback control based on the vehicle's current speed. At higher speeds, acceleration-based control is used, while at low speeds, speed-based control takes over. This dynamic adaptation allows the system to maintain smooth stop performance across all speed ranges without requiring a completely complex control architecture.
Solution Approach 2:
The invention changes the control parameter from acceleration to speed when the vehicle enters the low speed zone. By switching the feedback parameter based on the operating condition (speed threshold), the system optimizes control effectiveness for smooth stopping at low speeds while maintaining the simpler acceleration-based control at higher speeds where it performs adequately.
2Ease of operation
If acceleration feedback control is used throughout the entire deceleration process, then the control logic remains consistent, but the vehicle experiences difficulty in smooth stopping at low speeds due to low target acceleration values
Solution Approach 1:
The control system dynamically adjusts the feedback parameter based on the vehicle's operating speed. The transition from acceleration-based to speed-based feedback control creates a hybrid control logic that adapts to different operational phases, ensuring smooth stopping at low speeds while maintaining reasonable consistency in the overall control approach.
Solution Approach 2:
The invention introduces an intermediate control strategy that bridges acceleration-based control and speed-based control. By using speed as a threshold parameter to trigger the switch between control modes, the system creates a seamless transition that maintains control logic coherence while improving smooth stop performance in the low speed zone.
3Reliability
If the control system switches to speed-based feedback control at low speeds, then smooth stop performance is improved, but the control system complexity increases
Solution Approach 1:
The control process is segmented into distinct phases based on speed thresholds. The deceleration process is divided into a high-speed phase (using acceleration-based feedback) and a low-speed phase (using speed-based feedback). This segmentation allows each control mode to be optimized for its specific operating range while keeping the overall system manageable through clear phase boundaries.
Solution Approach 2:
The control system employs dynamic switching between two relatively simple control modes rather than implementing a single complex adaptive controller. By using a speed threshold as the switching criterion, the system achieves smooth stop performance improvement through a straightforward conditional logic structure, minimizing the increase in overall system complexity.
Data Source
AI summary
A control device, a control method, and a control system for an electric vehicle are configured to use both of one-pedal feedback control based on an acceleration and one-pedal feedback control based on a speed, to thereby decelerate a vehicle to stop.