Regenerative Braking Torque Control for Traction Loss
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Solution Overview
Problem
Conventional electric and hybrid vehicles face challenges in managing regenerative energy during deceleration, particularly in less ideal conditions such as rainy, icy, or snowy weather, where high deceleration rates can lead to traction loss and compromised drivability, and existing methods fail to adequately address these issues.
Innovation Solution
An adjustable regenerative limit and warning system that uses sensors to detect wheel slip and environmental conditions, a processor to limit regenerative energy based on traction data, and a display to alert the user, allowing for controlled energy regeneration and reduced deceleration rates by switching between predefined drive modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If greater operation of the motor in reverse direction is used during deceleration, then more regenerative energy is provided to the battery for charging, but the vehicle experiences greater reduction in speed and potential traction loss
Solution Approach 1:
The system dynamically adjusts the regenerative braking torque based on real-time traction conditions detected by sensors. When wheel slip is detected or traction is insufficient, the control system reduces the regenerative braking torque to prevent traction loss, while maximizing energy recovery when traction is adequate. This dynamic adjustment resolves the contradiction between energy recovery and traction maintenance.
Solution Approach 2:
The system changes the operational parameters of the motor during deceleration based on detected conditions. By adjusting the motor torque parameter in response to wheel slip detection, the system optimizes the balance between regenerative energy capture and maintaining sufficient traction, preventing skidding while maximizing charging efficiency.
2Productivity
If higher deceleration rates are used during energy regeneration, then quicker charging of the battery is achieved, but drivability and vehicle performance are compromised in less ideal conditions
Solution Approach 1:
The system dynamically adapts the deceleration rate based on real-time detection of wheel slip and traction conditions. When ideal traction is detected, higher deceleration rates are permitted for faster charging. When traction deteriorates, the system dynamically reduces deceleration rate to maintain drivability, resolving the contradiction between charging speed and ease of operation.
3Reliability
If regenerative energy is limited based on traction conditions, then traction loss is prevented, but the amount of energy recovered is reduced
Solution Approach 1:
The system changes the regenerative braking parameter based on detected traction conditions. When wheel slip is detected, the parameter is adjusted to limit regenerative energy and prevent further traction loss. When traction is sufficient, the parameter allows maximum energy recovery. This conditional parameter adjustment resolves the contradiction between traction control and energy recovery.
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
The system effectively limits regenerative energy to prevent traction loss and improve drivability in adverse conditions, providing a controlled stop and reducing the risk of skidding, while being cost-effective and integratable with existing vehicle systems.
Implementation Method 1
By operating the motor in a reverse or opposite direction during slowing of the vehicle, energy may be generated by the motor and transmitted to the battery for recharging the battery
Implementation Method 2
a first sensor for sensing wheel slip of the vehicle
Data Source
AI summary
An adjustable regenerative limit and warning system and method for controlling regenerative energy of a vehicle. The system includes a battery, a motor, a processor and an indicator. The motor provides regenerative energy to the battery during deceleration of the vehicle. The processor determines instantaneous or calculated traction loss of the vehicle and controls or limits the regenerative energy provided to the battery to avoid or reduce such traction loss. A drive mode having a predetermined regenerative energy capability is selected by the processor for limiting the regenerative energy. Sensors coupled with the battery sense characteristics of the battery for provision to the processor for determining a charge capability of the battery. If the charge capability for the battery is lower than the regenerative energy capable by the drive mode, the regenerative energy may be further limited and a warning or notification transmitted to a user of the vehicle.