Electromechanical Brake Booster Torque Loss Determination
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Solution Overview
Problem
Existing electromechanical brake boosters face challenges in accurately determining and adjusting torque loss, leading to suboptimal operation and potential manufacturing deviations, which can result in inefficient braking performance and increased costs.
Innovation Solution
A sensor device and method for accurately determining torque loss in electromechanical brake boosters by analyzing signals related to brake pressure build-up, motor torque, and environmental conditions, allowing for real-time adjustments and improved control strategies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If torque loss is merely estimated without direct measurement, then the device complexity is reduced, but the measurement precision and reliability of braking performance deteriorate
Solution Approach 1:
The patent replaces direct mechanical measurement of torque loss with an electronic calculation system. The control unit computes torque loss based on electrical parameters (motor torque, rotation speed, master brake cylinder pressure) rather than using mechanical sensors, thereby maintaining measurement precision while reducing device complexity.
Solution Approach 2:
The patent introduces intermediate parameters (motor torque MM, rotation speed ω, master brake cylinder pressure p) as mediators to indirectly determine torque loss. Instead of directly measuring torque loss, the system measures these intermediate parameters and calculates the final value, achieving precise measurement without complex direct measurement mechanisms.
2Productivity
If standard manufacturing processes are used without individual adjustment, then productivity is improved, but the reliability and performance consistency deteriorate due to manufacturing deviations
Solution Approach 1:
The patent performs preliminary characterization of each brake booster during or after manufacturing by determining its specific torque loss characteristics. This preliminary action creates individualized data records that are stored and used for subsequent control operations, ensuring each unit operates reliably according to its actual characteristics while maintaining standard manufacturing processes.
Solution Approach 2:
The patent changes the control parameters of each brake booster based on its measured torque loss characteristics. By adjusting control parameters individually for each unit according to its specific performance characteristics, the system achieves consistent reliable operation across all units despite manufacturing variations, without requiring physical adjustments to the hardware.
3Adaptability or versatility
If torque loss characteristics are determined under all possible operating conditions, then the adaptability is improved, but the loss of time and measurement complexity worsen
Solution Approach 1:
The patent determines torque loss characteristics periodically under standardized operating conditions rather than continuously under all possible conditions. By selecting representative standard operating points for measurement and using interpolation or calculation for other conditions, the system achieves good adaptability while significantly reducing the time and complexity required for characterization.
Data Source
AI summary
A method for ascertaining a torque loss of an electromechanical brake booster of a braking system, including ascertaining when a user of the braking system requests a brake pressure build-up in at least one wheel brake cylinder of the braking system, using the electromechanical brake booster, by actuating a brake actuation element of the braking system; and optionally determining an actual value with regard to the torque loss of the motor of the electromechanical brake booster, taking into account at least one provided sensor variable with regard to a motor torque of a motor of the electromechanical brake booster, a change over time of a rotation speed of the motor of the electromechanical brake booster, and/or a master brake cylinder pressure that is present in a master brake cylinder of the braking system.