Torque Distribution for Consistent Braking Feel
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Solution Overview
Problem
Braking recuperation in electric or hybrid vehicles results in irregular braking 'feel' due to uneven kinetic energy conversion, affecting driving stability and comfort.
Innovation Solution
A system with a brake device and controllable torque distribution device, controlled by a vehicle controller, that identifies and counteracts undesired influences by applying brake torque and adapting torque distribution to individual wheels, ensuring consistent braking behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If braking recuperation is implemented to convert kinetic energy into electrical energy, then energy recovery is improved, but braking feel consistency deteriorates
Solution Approach 1:
The controller continuously monitors the actual braking force generated during recuperation and compares it with the desired braking force. Based on this feedback, the controller adjusts the torque distribution to the wheels in real-time to compensate for deviations, ensuring consistent braking feel while maintaining energy recovery.
Solution Approach 2:
The system dynamically changes the torque distribution parameters to individual wheels based on their specific conditions (such as slip ratio, vertical load, and braking force). By adjusting these parameters adaptively, the system maintains consistent overall braking feel while optimizing energy recovery from each wheel.
2Power
If kinetic energy conversion is performed during braking recuperation, then electrical energy generation is improved, but driving stability deteriorates due to irregular braking behavior
Solution Approach 1:
The system applies different torque distribution strategies to different wheels based on their local conditions. Each wheel receives customized torque control tailored to its specific operating state, which prevents irregular braking behavior that would compromise driving stability while still enabling effective energy recovery.
Solution Approach 2:
The torque distribution to wheels is made dynamic rather than static. The controller continuously adapts the torque distribution in response to changing vehicle conditions, ensuring driving stability is maintained throughout the braking recuperation process while maximizing electrical energy generation.
3Ease of operation
If brake torque is applied to individual wheels for counteracting undesired influences, then braking feel consistency is improved, but device complexity increases
Solution Approach 1:
The existing torque distribution device, originally designed for other functions, is utilized for the additional purpose of counteracting undesired influences during braking recuperation. This multi-functional approach improves braking feel consistency without requiring entirely new hardware, thereby limiting the increase in device complexity.
Solution Approach 2:
The controller automatically adjusts torque distribution to compensate for braking inconsistencies without requiring additional mechanical components. The system uses its existing computational and control capabilities to self-correct braking feel issues, minimizing the need for extra hardware and keeping device complexity manageable.
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
This solution improves driving stability and comfort by compensating for uneven load torques and yawing effects, providing a consistent braking experience.
Implementation Method 1
kinetic energy of a motor vehicle is converted into electrical energy using a generator
Data Source
AI summary
A method, carried out in a controller of a motor vehicle having a plurality of wheels, to counteract an undesired influence on the motor vehicle. The method comprises determining, during a braking recuperation process, the undesired influence that is caused by the braking recuperation process and counteracting the determined undesired influence using a vehicle system that affects torques present at one or more wheels of the plurality of vehicle wheels.