Adaptive EV Pedal Mapping for One-Pedal Deceleration Control
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Solution Overview
Problem
One-pedal functionality in electric vehicles often results in excessive deceleration when the accelerator pedal is released, requiring increased driver attention and stress, especially during highway cruising or rapid deceleration scenarios, as the vehicle may not decelerate quickly enough when a vehicle ahead begins to slow down.
Innovation Solution
A pedal control system that includes a memory and electronic controller to store and switch between multiple pedal maps based on determined variances, allowing the vehicle to adapt its acceleration and braking control by switching between alternative pedal maps in response to vehicle speed and driver input, thereby optimizing deceleration rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single fixed pedal map is used for one-pedal operation, then the control logic is simple, but the system cannot adapt to different driving conditions resulting in excessive or insufficient deceleration
Solution Approach 1:
The patent implements multiple pedal maps that are dynamically selected based on real-time driving conditions such as vehicle speed, accelerator pedal position, and brake pedal status. The system transitions between different pedal maps (e.g., first pedal map for normal cruising, second pedal map for highway conditions) to adapt deceleration characteristics to current operational context, resolving the contradiction between adaptability and complexity through conditional logic rather than fixed control
Solution Approach 2:
The system changes control parameters by switching between different pedal maps that define different relationships between accelerator pedal input and torque request. Each pedal map contains different deceleration curves and torque reduction schedules, allowing the system to adjust its behavior parameters based on driving conditions without requiring complex real-time calculations
2Speed
If high deceleration rate is applied when accelerator pedal is released, then stopping distance is reduced, but driver stress increases due to excessive deceleration during normal cruising
Solution Approach 1:
The system dynamically adjusts deceleration rates by selecting different pedal maps based on vehicle speed and driving context. At high speeds (highway cruising), the system uses a first pedal map that provides gentler deceleration to reduce driver stress. When a vehicle ahead decelerates rapidly, the system switches to a second pedal map that enables faster deceleration, thus adapting the deceleration rate to current conditions rather than applying a fixed high deceleration rate
Solution Approach 2:
The system continuously monitors driving conditions including vehicle speed, accelerator pedal position, and surrounding traffic conditions to determine when to switch between pedal maps. This feedback mechanism allows the system to adjust deceleration behavior in response to actual driving scenarios, providing gentle deceleration during normal cruising and rapid deceleration when safety requires it
3Ease of operation
If gentle deceleration is used during highway cruising, then driver stress is reduced, but the vehicle cannot decelerate quickly enough when a vehicle ahead begins to slow down rapidly
Solution Approach 1:
The system pre-defines multiple pedal maps with different deceleration characteristics stored in memory. The first pedal map is optimized for gentle deceleration during highway cruising to reduce driver stress, while the second pedal map is pre-configured for rapid deceleration. The system can quickly switch between these pre-prepared control strategies based on detected driving conditions, eliminating the need to calculate optimal deceleration in real-time
Solution Approach 2:
The system dynamically switches between different deceleration profiles based on real-time monitoring of driving conditions. When normal cruising is detected, the gentle deceleration profile is active. When rapid deceleration of a leading vehicle is detected, the system transitions to the rapid deceleration profile, allowing the vehicle to respond appropriately to changing conditions rather than being constrained to a single deceleration rate
Data Source
AI summary
A method of controlling an electric vehicle includes operating the vehicle in accordance with a current pedal map. A plurality of alternative pedal maps is defined. A variance for each of the plurality of alternative pedal maps is determined. Operation of the vehicle is switched from the current pedal map to one of the alternative pedal maps based on the determined variance.