Torque Derate for Hybrid Drivetrain Traction Control
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Solution Overview
Problem
In hybrid and electric powertrain systems, regenerative braking is often triggered without considering road conditions, leading to multiple traction control events in poor traction situations due to a predetermined amount of negative torque being reapplied, which is based on dry road conditions, resulting in inefficient fuel consumption and reduced performance.
Innovation Solution
A system and method that incrementally derates torque applied by the drivetrain in response to multiple traction control events detected over a predetermined time period, using a controller to adjust the torque derate schedule, allowing for more effective utilization of regenerative braking torque and minimizing slippage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a predetermined amount of negative torque is applied during regenerative braking, then braking efficiency is improved, but multiple traction control events occur in poor traction conditions
Solution Approach 1:
The torque application is made dynamic rather than predetermined. The controller adjusts the amount of negative torque applied during regenerative braking based on real-time detection of traction control events. When traction control events are detected, the controller reduces or derates the torque application, preventing wheel lockup and multiple traction control events in poor traction conditions.
Solution Approach 2:
The system implements feedback control by continuously monitoring wheel speed and detecting traction control events. Based on this feedback, the controller adjusts the regenerative braking torque in real-time. When traction control events are detected, the system reduces torque application to maintain stability, and can gradually increase it when conditions improve.
2Speed
If the same amount of negative torque is re-applied each time braking occurs, then braking response is improved, but fuel consumption increases and performance reduces
Solution Approach 1:
The system changes the torque parameter dynamically based on vehicle operating conditions. Instead of applying a fixed predetermined torque, the controller adjusts the torque magnitude according to detected traction control events and vehicle state, optimizing the balance between braking response and energy efficiency.
Solution Approach 2:
The braking system transitions from static predetermined torque to dynamic adaptive torque. The controller continuously monitors vehicle conditions and adjusts torque application accordingly, reducing torque when traction control events occur and gradually restoring it when conditions improve, thereby optimizing fuel consumption and performance.
3Stability of the object's composition
If torque derate is applied during traction control events, then traction stability is improved, but sudden reapplication of torque causes problems
Solution Approach 1:
The controller prepares for torque reapplication by implementing a controlled derate schedule before full torque is restored. When traction control events are detected, the system gradually reduces torque rather than abruptly cutting it, and plans the recovery sequence to avoid sudden reapplication that could cause instability or harmful effects.
Solution Approach 2:
The system uses periodic assessment of traction conditions to determine when to restore torque. After derating torque during traction control events, the controller continuously monitors conditions and restores torque in a controlled, periodic manner rather than immediately, preventing sudden reapplication effects while maintaining traction stability.
Data Source
AI summary
A method, apparatus, and system are disclosed for incrementally derating a torque applied by a drivetrain in response a number of traction control events detected by a traction control system over a predetermined time period.