Brake Booster Control Device Managing System Pressure
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Solution Overview
Problem
Conventional brake boosters often experience excessive pressure in the braking system, particularly during brake fluid recirculation, leading to system overload, which existing control systems fail to effectively prevent or limit.
Innovation Solution
A control device that adjusts the operation of a controllable brake booster by considering variables such as brake pedal travel, driver force, and system pressure, using a characteristic curve to establish a corrected setpoint motor torque, thereby limiting pressure through electronic control of the motor torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the brake booster is operated to provide braking assistance, then the braking force is improved, but excessive pressure occurs in the braking system leading to system overload
Solution Approach 1:
The control device continuously monitors the actual system pressure and compares it against a maximum permissible pressure threshold. When the actual pressure exceeds or is predicted to exceed the maximum permissible pressure, the control device automatically reduces or stops the motor torque output to the brake booster, thereby preventing excessive pressure buildup while maintaining adequate braking force during normal operation
Solution Approach 2:
The system dynamically adjusts the motor torque parameter based on real-time pressure conditions. By changing the torque parameter from a fixed value to a variable that responds to pressure feedback, the system optimizes the balance between providing sufficient braking assistance and preventing system overload
2Speed
If the brake booster operates simultaneously with brake fluid recirculation, then the braking response is improved, but higher pressures than desirable occur in the braking system
Solution Approach 1:
The control device detects the pressure conditions during brake fluid recirculation operations and provides real-time feedback to adjust motor torque. When recirculation is detected and pressure approaches the maximum permissible level, the system automatically modulates the torque output to prevent excessive pressure while maintaining the benefits of simultaneous recirculation and braking assistance
Data Source
AI summary
A control device for a controllable brake booster of a braking system is configured to: establish a setpoint variable regarding a setpoint operation to be carried out with the aid of the controllable brake booster, under consideration of a provided specified variable regarding a setpoint pressure to be set in a partial volume of the braking system; establish a setpoint difference of the setpoint variable, under consideration of the specified variable and an actual variable regarding an actual pressure present in a subarea of the braking system, to establish a corrected setpoint variable taking the established setpoint difference into consideration; and output a control signal which corresponds to the established corrected setpoint variable to the controllable brake booster and/or to the power supply component of the controllable brake booster.