Electromechanical Brake Booster Control for Low-Latency Pedal Feel
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Solution Overview
Problem
The existing electromechanical brake booster systems experience delays in providing counterforce feedback to the driver due to signal propagation times on the vehicle's data bus, leading to a less direct and less comfortable pedal feel during braking, especially in electric vehicles where virtual brake pressure calculations introduce latency.
Innovation Solution
Calculating the virtual brake pressure directly in the brake booster or its control unit by reading current clearance and stiffness values from the data bus, eliminating the need for transmitting pedal travel and pressure values, thereby reducing latency and improving pedal feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If virtual brake pressure calculation is performed in the brake system control unit and transmitted via data bus, then the brake system can provide counterforce feedback, but signal propagation delays cause latency in pedal feel response
Solution Approach 1:
The patent merges the virtual brake pressure calculation function from the brake system control unit into the brake booster control unit. This integration eliminates the need for data bus transmission between separate units, combining multiple functions (pedal travel acquisition, clearance value reading, stiffness factor reading, and virtual brake pressure calculation) into a single control unit to remove communication latency.
Solution Approach 2:
The patent segments the brake system into distinct functional components with clear data flow: the brake booster control unit acquires pedal travel directly from the brake booster, reads clearance and stiffness values from the data bus, and independently calculates virtual brake pressure without requiring intermediate processing in the brake system control unit.
2Reliability
If data is transmitted via encrypted data bus to satisfy security requirements, then security is improved, but transmission delays increase causing longer signal propagation times
Solution Approach 1:
The patent extracts the time-critical virtual brake pressure calculation from the encrypted data transmission path. By performing the calculation locally in the brake booster control unit using directly acquired pedal travel data and recently read clearance/stiffness values, the system removes the most time-sensitive operation from the encrypted communication path, retaining only the less time-critical reading of clearance and stiffness values via the secure data bus.
Data Source
AI summary
A method for operating an electromechanical brake booster of a brake system of a vehicle. A virtual dynamic brake pressure value representing a driver braking request of a driver of the vehicle is determined in a control unit of the brake booster using a pedal travel of a brake pedal of the vehicle acquired at the brake booster, a clearance value of the brake system read in via a data bus of the vehicle from a brake control unit of the brake system, and a stiffness factor of the brake system read in via the data bus from the brake control unit.