Brake Pressure Regulation Using Gradient-Based Overflow Control
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Solution Overview
Problem
Existing braking system pressure regulation methods fail to achieve rapid and precise pressure demands, especially during high and rapid pressure requirements, leading to incorrect calculation of overflow volume and actuation accuracy issues due to the Venturi effect.
Innovation Solution
A method that involves determining the pressure demand gradient, calculating a volume flow requirement using a characteristic curve, and activating a special mode to maintain a minimum volume flow requirement when the gradient exceeds a limit, thereby ensuring the pressure demand is reached rapidly and accurately, without the need for additional pressure sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the pump is actuated solely on the basis of the pressure demand gradient, then the regulation is simple and works well for slow pressure demands, but the pressure demand cannot be reached rapidly and precisely in the event of rapid, high pressure demands
Solution Approach 1:
The regulation strategy is made dynamic by switching between different operating modes (normal mode and special mode) based on the pressure demand gradient. The system adapts its behavior: in normal mode it uses standard pump control, while in special mode (activated when gradient exceeds threshold) it implements minimum volume flow requirements and modified overflow valve control to handle rapid pressure demands effectively.
Solution Approach 2:
The system changes control parameters based on operating conditions. When the pressure demand gradient exceeds a threshold, the system transitions to special mode where the volume flow requirement is constrained to have a minimum value, and the electrical valve current calculation for the overflow valve is adjusted. This parameter adaptation allows the system to respond appropriately to both slow and rapid pressure demands.
2Device complexity
If the volume flow requirement is calculated from the pressure demand gradient, then the calculation is straightforward, but the calculated volume flow requirement is reduced to an impermissible extent when the pressure demand is kept constant, leading to incorrect overflow volume calculation
Solution Approach 1:
The system uses feedback from the pressure demand gradient to determine when to activate special mode. When the gradient exceeds a threshold value, the system detects this condition and switches to special mode operation, where the volume flow requirement is constrained to maintain a minimum value. This feedback mechanism prevents the volume flow requirement from being reduced to impermissible levels during constant pressure phases following rapid demands.
Solution Approach 2:
The system prepares for potential calculation errors by implementing a minimum volume flow requirement constraint in advance. Before the overflow volume calculation can become incorrect, the special mode preemptively maintains the volume flow requirement above a threshold level, preventing the scenario where the calculated requirement would otherwise be reduced to impermissible extents.
3Ease of operation
If correction values are calculated for the electrical valve current based on incorrect overflow volume, then the valve current is adjusted, but the actuating accuracy of the overflow valve is significantly worsened
Solution Approach 1:
The system converts the potentially harmful effect of incorrect overflow volume calculations into a beneficial outcome by using the pressure demand gradient as a trigger. When the gradient indicates a rapid pressure demand, the system activates special mode which maintains appropriate volume flow requirements. This transforms what could be a source of error into a reliable indicator for switching to a more accurate control mode, thereby improving overall valve actuating accuracy.
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 approach allows for precise and rapid pressure regulation in braking systems, preventing under-pressure issues during high demands and avoiding over-braking by maintaining a stable volume flow requirement, thus enhancing the accuracy and reliability of the braking system.
Implementation Method 1
the Venturi effect causes forces to act on a valve tappet in the overflow valve and move said valve tappet
Data Source
AI summary
A method for regulating a pressure setting in a braking system includes receiving a pressure demand and determining a pressure demand gradient from the pressure demand, determining a volume flow requirement from the pressure demand gradient, generating a hydraulic pressure by utilizing a pressure application device, determining an actual volume flow of the pressure application device, regulating an overflow valve on the basis of the pressure demand and the difference between the actual volume flow and the volume flow requirement. A special mode is activated when the pressure demand gradient exceeds a gradient limit value, a minimum value for the volume flow requirement being set in the special mode on the basis of a last maximum of the volume flow requirement. The special mode is deactivated when a difference between the pressure demand and a system pressure falls below a first limit value.