Braking System Partial Circuit Decoupling for Pressure Dynamics
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Solution Overview
Problem
Current braking systems face challenges in achieving high pressure buildup dynamics, particularly in extremal situations like pedestrian protection, where rapid and effective braking is crucial, and existing systems often operate at their limits, leading to reduced performance and increased demands on motor elements.
Innovation Solution
The braking system incorporates a partial brake-by-wire design with a separating element that decouples one brake-circuit partial circuit from the driver's pressure, reducing hydraulic line pressure and alleviating motor element demands, allowing for increased pump element delivery capacity and improved pressure buildup dynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the braking system operates at its limit in extremal situations (full braking), then the maximum braking force is achieved, but the pressure buildup dynamics are reduced and the motor element demands increase
Solution Approach 1:
The braking system is divided into two independent brake-circuit partial circuits (first and second circuits) that can be operated separately. This segmentation allows the system to optimize pressure buildup dynamics in one circuit while maintaining braking force in the other, resolving the contradiction between maximum braking force and rapid pressure buildup.
Solution Approach 2:
The system applies partial braking action by activating only one brake-circuit partial circuit during extremal situations, rather than operating both circuits at their limits. This partial action reduces motor element demands and improves pressure buildup dynamics while still achieving sufficient braking force through the active circuit.
2Device complexity
If a solely hydraulic braking system is used, then the system simplicity is maintained, but the pressure buildup dynamics are insufficient for improved pedestrian protection
Solution Approach 1:
A motor element acts as an intermediary between the driver's brake pedal input and the hydraulic braking system. This motor element actively boosts pressure buildup dynamics by providing additional force to the hydraulic system, achieving rapid pressure increase while maintaining a relatively simple overall system architecture.
Solution Approach 2:
The system combines hydraulic principles with motor-driven pressure generation. The motor element drives a pump that generates high pressure in the hydraulic fluid, enabling rapid pressure buildup dynamics while maintaining the simplicity of hydraulic brake actuation at the wheel level.
3Reliability
If the motor element is dimensioned for maximum braking force, then the extremal operating points are covered, but the system weight and costs increase
Solution Approach 1:
By segmenting the braking system into two independent circuits, the motor element only needs to be dimensioned to handle the demands of one circuit at a time rather than both simultaneously. This reduces the required motor size, weight, and cost while still providing reliable coverage of extremal operating points through selective circuit activation.
Solution Approach 2:
The motor element is dimensioned for partial operation, handling only one brake-circuit partial circuit at a time. This partial dimensioning reduces weight and cost while maintaining reliability, as the system can switch between circuits to cover all extremal operating conditions without requiring the motor to handle the full combined load.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances pressure buildup dynamics, reducing the motor element's operating point from extreme conditions, enabling higher delivery capacity and shorter braking distances, thus improving pedestrian protection while reducing costs and weight, and potentially lowering fuel consumption.
Implementation Method 1
The motor element is activated by the pedal movement of the brake pedal, optionally using sensors/control unit, and in turn drives the pump elements to provide an additional brake force
Implementation Method 2
pump elements, which introduce a pressure into the hydraulic line system in addition to the brake pressure of the driver introduced via a brake pedal
Implementation Method 3
brake elements are pressed against one another by this pressure and thus deceleration of the vehicle takes place as a result of the elevated friction of the brake elements among one another
Data Source
AI summary
A method for dimensioning a component of a braking system; the braking system having at least two brake-circuit partial circuits; each brake-circuit partial circuit having at least one pump element for building up a brake-circuit pressure and/or for returning brake-circuit fluid in an ABS case, the pump elements of the at least two brake-circuit partial circuits being operable using a motor element; and the at least two brake-circuit partial circuits being separable using a separating element, so that different brake-circuit pressures may be created in the at least two brake-circuit partial circuits.