Brake Control Device Valve Management for Pressure Buildup
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Solution Overview
Problem
The existing brake systems for vehicles face challenges in maintaining brake pressure during the suctioning of brake fluid from the reservoir into the motorized piston-cylinder device, which can prolong the time required to reach target brake pressure and affect braking performance.
Innovation Solution
A control device that manages the first and second separating valves to transfer brake fluid from the master brake cylinder to the wheel brake cylinder during suctioning, ensuring continuous pressure buildup by opening the first separating valve only when the master brake cylinder pressure is higher, and maintaining the second valve open to decouple the wheel brake cylinder from the motorized piston-cylinder device during suctioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If brake fluid is suctioned from the brake fluid reservoir into the motorized piston-cylinder device, then the motorized piston-cylinder device is reloaded with brake fluid, but the brake pressure in the wheel brake cylinder decreases or remains constant during the suctioning duration
Solution Approach 1:
The brake system is segmented into two independent fluid pathways: one pathway (via first separating valve) connects the master brake cylinder to the wheel brake cylinder, while the other pathway (via second separating valve) connects the motorized piston-cylinder device to the wheel brake cylinder. This segmentation allows simultaneous operation of fluid transfer from the master brake cylinder and suctioning into the motorized piston-cylinder device without mutual interference, resolving the contradiction between reloading the motorized device and maintaining brake pressure.
Solution Approach 2:
The master brake cylinder acts as an intermediary fluid source that supplies brake fluid to the wheel brake cylinder via the first separating valve during the suctioning phase. This intermediary mechanism ensures continuous brake pressure maintenance in the wheel brake cylinder even while the motorized piston-cylinder device is being reloaded from the brake fluid reservoir.
2Stress or pressure
If the motorized piston-cylinder device operates in pressure buildup mode, then brake pressure in the wheel brake cylinder increases, but the motorized piston-cylinder device requires continuous brake fluid supply which depletes the brake fluid reservoir
Solution Approach 1:
The system performs preliminary suctioning of brake fluid from the reservoir into the motorized piston-cylinder device before pressure buildup operations begin or during interruptions. This preliminary action ensures the motorized device is pre-loaded with sufficient brake fluid to sustain pressure buildup operations without immediate reservoir depletion, enabling continuous braking performance.
3Stress or pressure
If the first separating valve is opened to transfer brake fluid from the master brake cylinder, then brake pressure in the wheel brake cylinder is maintained during suctioning, but brake fluid volume in the master brake cylinder decreases
Solution Approach 1:
The system temporarily utilizes brake fluid from the master brake cylinder to maintain wheel brake cylinder pressure during suctioning operations, then recovers the brake fluid volume by subsequent suctioning operations that refill the motorized piston-cylinder device. This cycle of temporary utilization and recovery ensures continuous braking capability while restoring fluid volumes.
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 solution allows for uninterrupted brake pressure increase in the wheel brake cylinder during suctioning, reducing the impact of suctioning duration on braking performance and enabling rapid deceleration without prolonging the braking path.
Implementation Method 1
the motorized piston-cylinder device (14) is operated in a pressure buildup mode in which, through an operation of the motorized piston-cylinder device (14), brake fluid is capable of being transferred from the motorized piston-cylinder device (14) into the at least one wheel brake cylinder (28)
Implementation Method 2
brake fluid is to be capable of being suctioned from a brake fluid reservoir (36) of the brake system into the motorized piston-cylinder device (14)
Data Source
AI summary
A control device is described for a brake system of a vehicle, having an electronics device that is designed to operate a motorized piston-cylinder device in a pressure buildup mode and simultaneously to control or to hold at least one first separating valve, via which at least one wheel brake cylinder is connected to a master brake cylinder, in its closed state, and to control or to hold at least one second separating valve, via which the at least one wheel brake cylinder is connected to the motorized piston-cylinder device, in its open state, and to operate the motorized piston-cylinder device in a suctioning mode, and at the same time to control the at least one second separating valve to its closed state, the electronics device being in addition designed to control the at least one first separating valve to its open state at least at times during the suctioning mode. A method is also described for increasing at least one brake pressure in at least one wheel brake cylinder of a brake system of a vehicle.