Vehicle Brake Pressure Control via Switching Valve Segmentation
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Solution Overview
Problem
Heavy vehicle braking systems face pressure drops in brake chambers when a valve is in the apply state, affecting braking torque availability across the circuit.
Innovation Solution
A controller manages braking pressures at wheels by maintaining higher pressure in one brake chamber while increasing pressure in another, using switching valves to adjust states and minimize pressure differences during ABS events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a valve is actuated to apply brake pressure to one brake chamber, then braking torque is improved at that wheel, but pressure drops in the reservoir and brake circuit affecting other brake chambers
Solution Approach 1:
The braking system is divided into multiple independent brake chambers (first brake chamber and second brake chamber) with separate control valves (first switching valve and second switching valve). This segmentation allows independent control of each brake chamber while maintaining pressure stability in the overall circuit by preventing simultaneous pressure drops across all chambers.
Solution Approach 2:
The system applies different pressure control strategies to different brake chambers based on local conditions. When one valve is in the apply state causing local pressure drop, the controller adjusts other valves to maintain appropriate pressure distribution, ensuring each brake chamber receives optimal pressure for its specific braking requirements.
2Quantity of substance
If compressed air volume available to brake chambers increases, then pressure drops in the reservoir, but more brake chambers can be supplied
Solution Approach 1:
The system dynamically adjusts the state of switching valves based on real-time pressure conditions and braking requirements. Rather than maintaining a fixed valve configuration, the controller continuously monitors and adjusts valve states to optimize the balance between air volume distribution and pressure maintenance in the reservoir and brake circuits.
Solution Approach 2:
The pressure stabilization mechanism operates as a feedback-controlled system. Pressure sensors monitor the brake circuit pressure, and when pressure drop is detected due to valve actuation, the controller responds by adjusting other switching valves to restore pressure balance, ensuring stable operation across the entire braking system.
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 maintains consistent braking torque across brake chambers, enhancing vehicle control and traction by reducing pressure drops and optimizing pressure distribution.
Implementation Method 1
Heavy vehicle braking systems commonly rely on compressed air for operating a vehicle braking system. Compressed air is produced by a compressor and stored in at least one reservoir.
Implementation Method 2
A controller manages braking pressures at wheels by maintaining higher pressure in one brake chamber while increasing pressure in another, using switching valves to adjust states and minimize pressure differences during ABS events.
Data Source
AI summary
A controller controls respective braking pressures at wheels on a vehicle. The controller includes a processor electrically communicating with a first switching valve, which controls a first of the braking pressure at a first of the wheels, and a second switching valve, which controls a second of the braking pressures at a second of the wheels. The processor, during a braking control event, controls the switching valve associated with the higher of the braking pressures to maintain the higher braking pressure while switching a state of the switching valve associated with the lower of the braking pressures to increase the lower braking pressure.