Dynamic Brake Deceleration Ratio Control
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Solution Overview
Problem
Regenerative brake systems in motor vehicles face challenges in maintaining consistent brake forces across different actuators due to wear, aging, and varying deceleration components, which cannot be fully corrected by static factors, especially when brake elements wear out.
Innovation Solution
A control unit dynamically adjusts the ratio of nominal deceleration components among brakes by determining a correction value based on the efficiency ratio of actual to nominal deceleration, continuously monitoring and readjusting to maintain predefined ratios, using the efficiency of an electric generator as a reference to compensate for deviations in brake performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a static correction factor is applied to brake actuators, then the brake force distribution is improved initially, but the deceleration ratio deviates over time due to wear and aging
Solution Approach 1:
The patent applies dynamics by transitioning from a static correction factor to a dynamic correction approach where correction values are continuously updated based on actual deceleration measurements. The control unit adjusts correction values for individual brake actuators in real-time according to changing wear conditions, making the system adaptive rather than fixed.
Solution Approach 2:
The patent implements feedback by measuring actual deceleration components from each brake actuator and using these measurements to determine correction values. The control unit receives feedback on brake performance deviations and automatically adjusts correction factors to maintain the target deceleration ratio, creating a closed-loop control system.
2Power
If different brake actuators are used for simultaneous braking, then the total brake output is increased, but the deceleration components differ from the defined ratio
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting correction values for each brake actuator based on measured actual deceleration components. These correction values modify the effective brake force distribution parameters to maintain the target deceleration ratio despite variations in actuator performance due to wear, aging, or manufacturing tolerances.
Solution Approach 2:
The system uses feedback from actual deceleration measurements to continuously determine and update correction values for each brake actuator. This feedback mechanism ensures that the deceleration ratio remains at the target value even when using multiple different brake actuators with varying performance characteristics.
3Duration of action of stationary object
If brake elements are exchanged due to wear, then the brake system continues to operate, but the correction factor can no longer compensate for performance changes
Solution Approach 1:
The patent applies self-service by enabling the brake system to automatically monitor its own performance and self-adjust correction values without external intervention. The control unit continuously measures actual deceleration and autonomously updates correction factors to compensate for wear and element replacement, making the system self-correcting throughout its service life.
Solution Approach 2:
The system transitions from a fixed correction factor to a dynamic correction mechanism that automatically adapts to changing brake element conditions. The correction values are continuously updated based on real-time deceleration measurements, allowing the system to maintain performance consistency through the entire service life of brake elements including replacement cycles.
4Device complexity
If the brake torque is distributed in predefined ratios to brake actuators, then the control is simplified, but the actual deceleration components deviate from nominal values
Solution Approach 1:
The patent maintains the simplicity of predefined torque distribution while adding a feedback layer that measures actual deceleration components and determines correction values. This feedback mechanism compensates for deviations without requiring complex real-time redistribution calculations, preserving control simplicity while improving deceleration accuracy.
Solution Approach 2:
The system applies parameter changes by introducing correction values that modify the effective brake torque distribution. These correction parameters are determined based on actual deceleration measurements and are applied to the predefined torque distribution ratios, allowing the system to maintain simple control logic while achieving accurate deceleration components.
Data Source
AI summary
Disclosed is a method for controlling a regenerative brake system with a number of friction brakes (F) and an electro-regenerative brake (R), whose total deceleration is composed of deceleration components of the brakes, and the actual deceleration components are desired to correspond to the nominal deceleration components as exactly as possible. A control unit is used to change the ratio of the nominal deceleration components of a number of brakes (R, F) relative to each other by determining a correction value (k1, k2) for a number of the brakes based on the quantities of efficiency w of a number of brakes representing the ratio between the actual deceleration (aactual) and the nominal deceleration (anominal), which correction value is applied to the nominal deceleration (anominal) of these brakes.