Brake Pressure Control Layout for Shut-Off Valve Failure
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Solution Overview
Problem
Conventional brake control devices for automatic driving systems face challenges in maintaining reliable wheel cylinder fluid pressure when a shut-off valve fails, leading to complications in system configuration and reduced reliability, especially when one fluid pressure control unit is inoperable.
Innovation Solution
A brake control device with two fluid pressure units, each having a shut-off valve controlled by its respective control unit, allowing for independent operation to ensure fluid pressure is maintained across all wheels even if one unit fails, simplifying the system configuration and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single shut-off valve is installed on the first fluid pressure control unit side to control communication between master cylinder and wheel cylinder, then the system configuration is simplified, but when the shut-off valve itself becomes inoperable due to a failure of the first control unit, the discharge fluid pressure of the pump in the second fluid pressure control unit escapes to the master cylinder reservoir tank, making it difficult to secure appropriate fluid pressure
Solution Approach 1:
The patent divides the single shut-off valve function into two separate shut-off valves: one in the first fluid pressure control unit and another in the second fluid pressure control unit. This segmentation allows each control unit to independently control its own shut-off valve, ensuring that if one control unit fails, the other can still maintain fluid pressure by controlling its respective shut-off valve to prevent discharge pressure from escaping to the reservoir tank.
2Adaptability or versatility
If a control unit configuration or harness connecting both control units is added to control a valve installed in one fluid pressure control unit from another control unit, then the valve can be controlled from another control unit, but the system configuration becomes complicated
Solution Approach 1:
Instead of adding complex cross-control mechanisms or harnesses to enable one control unit to control another's valve, the patent segments the control functions by providing each control unit with its own shut-off valve and control capability. This eliminates the need for inter-unit control connections while maintaining the ability to control fluid flow from either unit independently.
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 configuration ensures reliable braking by isolating the failure of one unit from affecting the other, maintaining appropriate fluid pressure across all wheels and simplifying the system configuration, thereby enhancing the reliability of automatic driving systems.
Implementation Method 1
a first shut-off valve which blocks a flow of the brake fluid relative to the connection pipe
Data Source
AI summary
Provided is a brake control device which reliably generates wheel cylinder fluid pressure in all the wheels FR to RR even at the time of failure of the brake control device, can reliably decelerate or stop a vehicle, has a simplified system configuration, and has high reliability for automatic driving. A brake device 101 of the present invention includes a first fluid pressure unit 102p which supplies brake fluid to first wheel cylinders 118a and 118d, a second fluid pressure unit 102s which supplies brake fluid to second wheel cylinders 118b and 118c, and a connection pipe 119 which connects the first fluid pressure unit and the second fluid pressure unit to allow the brake fluid to flow. The first fluid pressure unit and the second fluid pressure unit open a first shut-off valve 104p and a second shut-off valve 104s, respectively, in a case where a failure is detected in at least one of the first fluid pressure unit and the second fluid pressure unit.