Brake System Valve Control for Rapid Pressure Build-up
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Solution Overview
Problem
Larger and heavier motor vehicles require more hydraulic fluid pressure for their brake systems, which builds up slowly and necessitates a more powerful pump, leading to weight disadvantages.
Innovation Solution
A brake system with an electronic brake control that rapidly builds up brake pressure by closing valves for rear wheel brakes and using a parking brake system for rear wheels, while using hydraulic pressure for front wheels, allowing for adjustable periods of valve closure to enhance braking efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a larger and more powerful fluid pump is provided to compensate for slower brake pressure build-up in larger and heavier motor vehicles, then brake pressure build-up speed is improved, but vehicle weight increases
Solution Approach 1:
The brake system is segmented into two independent pathways: a hydraulic system for front wheel brakes and a parking brake system for rear wheel brakes. This segmentation allows each subsystem to be optimized independently, enabling rapid brake force generation without requiring a single oversized pump that would increase overall system weight
Solution Approach 2:
The parking brake system is pre-positioned and ready to activate immediately on the rear wheels, providing instant brake force contribution without waiting for hydraulic pressure build-up. This preliminary action capability allows the system to achieve rapid overall braking response without needing to oversize the hydraulic pump
2Device complexity
If the hydraulic system supplies pressure to all wheel brakes, then braking force distribution is simplified, but brake pressure build-up becomes slower in larger vehicles
Solution Approach 1:
The brake system divides the vehicle into two zones with different actuation mechanisms: front wheels receive hydraulic pressure through the main hydraulic system, while rear wheels are actuated by the parking brake system. This segmentation resolves the contradiction by allowing each zone to use the most appropriate actuation method for its specific requirements
Solution Approach 2:
The parking brake system is activated to provide partial braking action on the rear wheels independently of the main hydraulic system. This partial action on the rear wheels compensates for the slower hydraulic pressure build-up, achieving overall rapid braking without requiring excessive hydraulic system capacity
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 enables rapid production of brake force during autonomous emergency braking, improving braking efficiency and stability without the weight penalty of a more powerful pump, by utilizing both hydraulic and parking brake systems effectively.
Implementation Method 1
a hydraulic system supplying the wheel brakes with a hydraulic fluid for the operation thereof
Implementation Method 2
a parking brake system that activates the rear wheel brakes
Data Source
AI summary
A brake system for a motor vehicle including front wheel brakes, rear wheel brakes, and a hydraulic system supplying hydraulic fluid to the wheel brakes. An electronic brake control connected to the hydraulic system actuates the hydraulic system to build up a brake pressure and supply the wheel brakes with the hydraulic fluid. The system includes a parking brake system that activates the rear wheel brakes. The electronic brake control actuates the hydraulic system to build up a brake pressure and at the beginning of an emergency braking procedure closes valves of the hydraulic system associated with the rear wheel brakes, opens valves of the hydraulic system associated with the front wheel brakes, and activates the parking brake system while keeping the valves of the hydraulic system associated with the rear wheel brakes closed for a period of adjustable length.