Brake System Torque Blending Gradient Control
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Solution Overview
Problem
In electrically powered vehicles, the transition between generator torque and friction braking torque during deceleration can cause acoustics and comfort issues due to gradient limitations, leading to inefficient braking when the friction brake device's gradient is either too high or too low.
Innovation Solution
A brake system with a control device that adjusts generator torque and friction braking torque to maintain a constant friction braking gradient, ensuring efficient and comfortable deceleration by adapting generator torque based on detected deceleration gradients, thereby optimizing the blending between generator and friction brake components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the friction brake device gradient is increased to improve braking efficiency, then braking efficiency is improved, but acoustics and comfort problems occur
Solution Approach 1:
The patent implements dynamic gradient adaptation where the friction brake device gradient is no longer fixed but varies based on operating conditions. The control device adjusts the gradient in real-time according to the generator torque gradient and braking situation, allowing the system to achieve high braking efficiency when needed while maintaining comfort when the generator can handle the deceleration demand.
Solution Approach 2:
The patent changes the gradient parameter of the friction brake device from a constant value to a variable parameter. By adapting the gradient based on the generator's capabilities and the desired deceleration profile, the system optimizes the balance between braking efficiency and acoustic/comfort performance, avoiding the fixed gradient limitations.
2Object-affected harmful factors
If the friction brake device gradient is decreased to reduce acoustics problems, then acoustics and comfort are improved, but braking efficiency decreases
Solution Approach 1:
The system dynamically adjusts the friction brake device gradient based on real-time conditions. When the generator can provide sufficient torque gradient, the friction brake gradient is reduced to minimize acoustics. When additional braking force is needed, the friction brake gradient is increased accordingly, maintaining braking efficiency while managing acoustic output.
Solution Approach 2:
The control device acts as an intermediary that coordinates between the generator and friction brake device. It calculates the optimal friction brake gradient by considering the generator's torque capabilities and the desired deceleration profile, enabling the friction brake to operate at optimal efficiency levels without causing acoustic discomfort.
3Power
If the generator torque gradient is increased to handle higher deceleration demands, then deceleration capability is improved, but the generator may experience significantly higher gradients than the friction brake device
Solution Approach 1:
The control device continuously monitors the generator torque gradient and the desired deceleration profile, using this feedback to calculate and adjust the friction brake device gradient. This closed-loop control ensures that the generator operates within its optimal gradient range while the friction brake device compensates to achieve the desired deceleration, simplifying generator gradient management.
Solution Approach 2:
The control device serves as an intermediary that balances the torque distribution between the generator and friction brake device. By calculating the appropriate friction brake gradient based on generator capabilities and deceleration demands, it prevents the generator from experiencing excessive gradients while maintaining overall deceleration performance.
4Device complexity
If a fixed generator torque gradient is used to simplify control, then control complexity is reduced, but the friction brake device gradient necessarily deviates from optimal values when the operating element is activated
Solution Approach 1:
The patent implements dynamic gradient calculation where the friction brake device gradient is continuously adapted based on the generator torque gradient and desired deceleration profile. This dynamic approach replaces fixed gradient values, allowing the system to maintain optimal braking efficiency across varying operating conditions while managing control complexity through systematic calculation methods.
Solution Approach 2:
The patent changes the friction brake device gradient from a fixed parameter to a variable parameter that adapts to operating conditions. By calculating the gradient based on the generator's torque gradient and the desired deceleration profile, the system optimizes brake efficiency without requiring complex control algorithms, using straightforward mathematical relationships.
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 ensures efficient and comfortable braking by maintaining optimal friction braking gradients, reducing acoustics issues and ensuring the brake system operates efficiently without being too slow or too aggressive.
Implementation Method 1
the vehicle can be decelerated by using electric motors, which are operated as a generator
Implementation Method 2
deceleration is done by using electric motors, which are operated as a generator, and/or by the friction brake
Data Source
AI summary
A brake system for an at least partly electrically powered vehicle having an electric motor operable as a generator; a friction brake device; a brake control device, which is designed to regulate a generator torque (MGE) of the generator and a friction braking torque (MRB) of the friction brake device; an operating element, especially a brake pedal or brake lever or accelerator pedal, which is designed to provide a desired deceleration.