Power-Brake Pressure Control for Smooth Residual Pressure Release
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Solution Overview
Problem
In power-brake systems with redundant generation of brake pressure, residual pressure in the brake circuit cannot be decreased in a controlled manner, leading to potential operating noises and uncomfortable vehicle deceleration, without the need for additional components or modifications.
Innovation Solution
A method that utilizes existing control technology to manage the brake pressure decrease by activating the circuit pressure control valve and plunger discharge valve, allowing pressure medium to be released into the reservoir, thereby maintaining a controlled pressure reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the second pressure-medium delivery device is used to increase brake pressure beyond the maximum of the first device, then the braking request can be fully satisfied, but the residual pressure cannot be decreased in a controlled manner
Solution Approach 1:
The method performs preliminary actions by first decreasing the brake pressure using the first pressure-medium delivery device before using the second device to remove residual pressure. This staged approach ensures controlled pressure reduction while maintaining the ability to handle high braking requests.
Solution Approach 2:
The first pressure-medium delivery device acts as an intermediary between the second device and the brake circuit. It provides a controlled pressure reduction path while the second device handles the residual pressure that cannot be removed through the first device alone.
2Ease of operation
If additional pressure-medium control components are added to enable controlled residual pressure decrease, then controlled pressure reduction is achieved, but the device complexity increases
Solution Approach 1:
The first pressure-medium delivery device is designed to serve multiple functions: it provides controlled pressure reduction during normal operation and also acts as an intermediary for removing residual pressure after the second device has completed its function. This eliminates the need for dedicated residual pressure control components.
Solution Approach 2:
The system uses its existing components (first pressure-medium delivery device, circuit pressure control valve, plunger discharge valve) to handle residual pressure removal without requiring external or additional specialized components. The existing infrastructure is made to serve the additional function of controlled residual pressure decrease.
3Device complexity
If residual pressure is not controlled, then the system remains simple, but operating noises and uncomfortable vehicle deceleration occur
Solution Approach 1:
The first pressure-medium delivery device serves as an intermediary that provides a controlled path for pressure medium removal. This intermediary structure enables smooth pressure reduction without the need for complex additional components, thereby eliminating noises and discomfort while maintaining system simplicity.
Solution Approach 2:
The method ensures continuous and controlled pressure reduction by coordinating the operation of the first and second pressure-medium delivery devices. This continuous action prevents abrupt pressure changes that would cause noises and uncomfortable deceleration, while the system maintains its relatively simple structure.
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 allows for a controlled reduction of residual pressure in the brake circuit, avoiding operating noises and maintaining smooth vehicle deceleration without additional components or modifications.
Implementation Method 1
a first pressure-medium delivery device (24) for displacing a corresponding volume of pressure medium in order to generate a brake pressure in a brake circuit (18a, 18b)
Implementation Method 2
a second pressure-medium delivery device (28) of a brake pressure modulator (26) for delivering pressure medium to the brake circuit (18a, 18b)
Implementation Method 3
wherein a brake pressure decrease in a brake circuit (18a, 18b) of a power-brake system (10) with redundant pressure supply comprises a valve-controlled pressure decrease phase, in which pressure medium is released to the reservoir (32) in a controlled manner through electrical activation of a circuit pressure control valve (44a, 44b)
Implementation Method 4
The plunger discharge valve (40) couples the first pressure-medium delivery device (24) to the reservoir (32) of the power-brake system (10) in a controllable manner
Data Source
AI summary
A method for controlling an electronically slip-controllable power-brake system with redundant generation of brake pressure. Under certain operating conditions, a shift in the pressure-volume characteristic curve towards higher pressures may arise in such power-brake systems. If the actual progression of the pressure-volume characteristic curve deviates from the target progression to an extent which can no longer be tolerated, a correction is required. To this end, a pressure-medium volume must be released from the brake circuit into a reservoir of the power-brake system. A method with which the release of pressure medium into the reservoir may be carried out in a controlled manner. The method can be carried out during a braking procedure without undesired noises or unexpected changes in the deceleration arising. It can be implemented by control technology and therefore in a particularly cost-effective manner.