Brake Circuit Pressure Control via Valve Actuation
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Solution Overview
Problem
Unregulated pump control in brake systems leads to noise, vibrations, and an unpredictable final pressure due to varying boundary conditions, making it difficult to reproduce the pressure in the brake circuit after the pump is switched off.
Innovation Solution
An electrically controllable pump motor and valve system where the pump builds pressure with the valve closed, and the valve is actuated to open when a pressure threshold is reached, with a controlled transition to a holding position after the pump is switched off, allowing for a reproducible pressure setting independent of pump overrun.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the pump is switched off after pressure build-up, then noise and vibrations are reduced, but the final pressure in the brake circuit cannot be reproduced
Solution Approach 1:
The valve is actuated to open before the pump is switched off, allowing the pump to complete its pressure build-up function while the valve prepares the circuit for pressure holding. This preliminary valve actuation ensures that when the pump stops, the pressure has already reached the desired level and will be maintained, thus resolving the contradiction between reducing noise/vibrations by switching off the pump and maintaining reliable pressure reproduction.
2Ease of operation
If the valve is held in a fixed position, then the system is simple to control, but the pressure cannot be maintained against varying boundary conditions
Solution Approach 1:
Instead of holding the valve in a fixed position, the invention continuously modifies the valve actuation after pump switch-off, transitioning from a first actuation to a second actuation with a holding position. This dynamic adjustment allows the valve to adapt to varying boundary conditions such as pump overrun and pressure differences, maintaining reliable pressure control while keeping the control system relatively simple through automated continuous adjustment.
3Device complexity
If the pump overrun is not compensated, then the control system is simpler, but the final pressure varies due to different boundary conditions
Solution Approach 1:
The system continuously modifies the valve actuation based on the actual pressure conditions and pump overrun behavior. By monitoring the pressure build-up process and adjusting the valve position accordingly during and after pump operation, the feedback mechanism compensates for variations in pump overrun caused by different boundary conditions, achieving precise and reproducible final pressure without requiring complex additional compensation devices.
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 method achieves a definable and reproducible pressure in the brake circuit, reducing noise and vibrations, and ensuring consistent pressure settings regardless of pump overrun or changing conditions.
Implementation Method 1
the pressure of which can be increased or reduced by means of at least one electrically controllable pump motor
Implementation Method 2
at least one electrically controllable valve is provided, for example in the form of a changeover valve, which can be used to regulate the pressure in the brake circuit
Data Source
Figure 1
Figure 2
Figure 3a~3e
AI summary
In order to achieve a predefinable and therefore reproducible ultimate pressure in at least one part of the brake circuit, first of all the pump (26) is actuated when the valve (18) is closed in order to build up or relieve the pressure. When a first predefined setpoint pressure is reached or when a pressure threshold value is exceeded, the valve (18) is moved into an open position by means of a first actuation. According to the invention, after the pump (26) is switched off, the actuation of the valve (18) is modified in such a way that, during a predefinable time, a continuous change of the first actuation is performed until a second actuation, in which the valve (18) assumes a holding position, in particular under consideration of the pressure difference which prevails at the valve (18).