EV One-Pedal Driving Control With Selective Creep Torque
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Solution Overview
Problem
Conventional one-pedal driving technologies in electric vehicles lack driver control over regenerative braking strength, leading to excessive deceleration, motion sickness, inconsistent driving experience, and inefficient fuel economy due to unnecessary motor torque use.
Innovation Solution
A vehicle driving control apparatus and method that allows drivers to select regenerative braking levels and creep settings, enabling controlled deceleration and stop control through a controller that adjusts motor torque based on vehicle speed and gear position, ensuring consistent driving and efficient energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If stop control is provided only at maximum regenerative strength, then the system structure is simple, but the driver cannot select desired deceleration levels leading to excessive deceleration and motion sickness
Solution Approach 1:
The system dynamically adjusts the one-pedal mode operation based on detected driving conditions. The controller determines whether to activate one-pedal mode by evaluating vehicle speed, accelerator pedal position, and brake pedal position, enabling the system to adapt between different deceleration strategies (one-pedal mode vs. conventional braking) rather than operating in a fixed state
Solution Approach 2:
The system changes operational parameters by switching between one-pedal mode and conventional braking mode based on detected conditions. When one-pedal mode is activated, the motor operates in regenerative braking mode with adjusted torque characteristics, while in conventional mode, standard braking parameters are used, allowing flexible adaptation to driver needs and conditions
2Ease of operation
If stop control is activated, then vehicle can stop using only accelerator pedal, but excessive deceleration causes motion sickness of passenger
Solution Approach 1:
The system dynamically adjusts deceleration characteristics by switching between one-pedal mode and conventional braking mode. When conventional braking mode is selected, the deceleration profile is modified to be less aggressive, reducing the risk of motion sickness while still achieving vehicle stop, thus adapting to passenger comfort requirements
Solution Approach 2:
The system changes the deceleration parameters by selecting different braking modes. In conventional braking mode, the motor torque and brake force are adjusted to provide smoother, less aggressive deceleration compared to one-pedal mode, thereby reducing motion sickness while maintaining stopping capability
3Adaptability or versatility
If stop control is automatically released upon gear shift to R-stage, then parking maneuver is enabled, but one-pedal mode must be manually reactivated causing inconsistency
Solution Approach 1:
The system dynamically maintains or deactivates one-pedal mode based on gear position and driving conditions. When shifted to R-stage, the controller evaluates whether to maintain one-pedal mode for consistent driving experience or deactivate it to enable creeping, and when returning to D-stage, the system can automatically reactivate one-pedal mode, adapting to the driving phase without requiring manual intervention
Solution Approach 2:
The system automatically manages the activation and deactivation of one-pedal mode based on gear position detection. When the gear is shifted back to D-stage, the controller automatically reactivates one-pedal mode without requiring manual paddle manipulation, making the system self-regulating and maintaining driving consistency autonomously
4Ease of operation
If stop control is always provided even in R-stage, then driving consistency is maintained, but creeping is impossible and parking is inconvenient
Solution Approach 1:
The system dynamically adjusts its operation based on gear position. When in R-stage, the controller deactivates one-pedal mode to enable creeping functionality, and when returned to D-stage, it reactivates one-pedal mode to maintain driving consistency, thus adapting to the current driving phase requirements
5Productivity
If maximum regenerative braking is used for stop control, then stopping efficiency is high, but unnecessary motor torque degrades fuel economy and causes heat issues
Solution Approach 1:
The system dynamically selects between one-pedal mode with maximum regenerative braking and conventional braking mode based on driving conditions. By switching to conventional braking when appropriate, the system avoids unnecessary motor torque application, reducing energy loss and heat generation while maintaining stopping efficiency when needed
Solution Approach 2:
The system changes the braking parameter strategy by selecting between regenerative braking mode and conventional braking mode. In conventional mode, the motor torque is reduced or eliminated, allowing the vehicle to coast or use friction brakes only, thereby improving fuel economy and reducing heat issues while still achieving effective stopping
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Provides customizable stop control at various regenerative braking levels, preventing motion sickness, enhancing fuel economy, and improving drivability by optimizing motor torque usage and allowing selective creep torque generation.
Implementation Method 1
one-pedal driving technology utilizes regenerative braking by a motor for vehicle deceleration or stop
Implementation Method 2
control the motor such that the motor generates a creep torque in the on state of the one-pedal mode
Data Source
AI summary
A vehicle driving control apparatus and method are capable of eliminating problems in conventional stop control provided in an electric vehicle. The vehicle driving control apparatus includes a manipulation device, an input device, a driving information detector, and a controller connected thereto. The controller determines whether the vehicle speed detected by the vehicle speed detector is not higher than a predetermined reference speed for creep initiation, when the on state of the one-pedal mode is selected through the manipulation device and creep allowance in parking is set through the input device. The controller controls a motor configured to drive the vehicle such that the motor generates a creep torque in the on state of the one-pedal mode, in response to determining that the vehicle speed is not higher than the predetermined reference speed for creep initiation.