Brake Booster Control for Torque Error and Vibration Reduction
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Solution Overview
Problem
Conventional boosted brake systems experience unnecessary energy consumption and vibration issues due to assistance forces applied during stationary states or additional braking torques, leading to discomfort for the driver.
Innovation Solution
A method to adapt the assistance force based on the vehicle's operating mode, regulating the brake force boosting to reduce energy consumption and prevent vibrations, by adjusting the assistance force to maintain a predefined braking torque setpoint, thereby improving operator control comfort without requiring additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the brake booster provides assistance force during stationary state or additional braking torque, then the driver braking force is reduced, but unnecessary energy consumption occurs
Solution Approach 1:
The brake booster dynamically adapts its assistance force based on real-time operating conditions (vehicle speed, brake pedal position, driving mode). The control unit continuously adjusts the assistance force to match actual braking needs, providing high assistance during dynamic braking while reducing or eliminating assistance during stationary states, thereby avoiding unnecessary energy consumption while maintaining ease of operation when needed
2Reliability
If the pump operates to maintain brake pressure, then the braking system reliability is improved, but vibrations are generated that affect driver comfort
Solution Approach 1:
The pump operates in periodic cycles rather than continuously, activating only when brake pressure drops below a threshold and deactivating when the setpoint is reached. This periodic operation, combined with adaptive control that adjusts pump activation based on vehicle speed and brake pedal position, maintains necessary brake pressure reliability while minimizing vibration generation by avoiding unnecessary pump cycles during stationary or low-speed conditions
3Force
If the assistance force is increased to improve braking performance, then the braking force is improved, but the system complexity increases
Solution Approach 1:
The system changes operational parameters (assistance force magnitude, pump activation timing, valve control signals) based on detected operating conditions rather than using complex mechanical structures. The control unit adjusts electrical control signals to multiple valves and the pump motor based on sensor inputs, achieving variable braking force through parameter modulation of existing components rather than adding complex mechanical systems
Data Source
AI summary
The invention relates to a method for operating a brake boosted brake system of a vehicle, comprising the monitoring of a mode of operation of the brake boosted brake system with regard to agreement of a total braking torque applied to at least one wheel of the vehicle by the brake boosted brake system with a specified target total braking torque and/or with regard to a displacement of a brake medium volume of the brake boosted brake system to a force/pressure conversion element (22) of the brake boosted brake system, if a braking torque difference between the applied total braking torque and the specified target total braking torque is greater than a specified reference difference, and/or if the brake medium volume displaced to the force/pressure conversion element (22) is larger than a specified reference volume; further comprising the defining of a target boosting force change with regard to a boosting force (Fu) provided by a brake booster (14) of the brake boosted brake system, taking into account the braking torque difference and/or the displaced brake medium volume, and outputting the target boosting force change to the brake booster (14). The invention further relates to a corresponding control device for a brake boosted brake system of a vehicle.