Hydraulic Braking Valve Segmentation for Off-Highway ABS
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Solution Overview
Problem
Heavy wheeled vehicles for off-highway use require ABS control systems with high volume throughput and high frequency, which existing solenoid switching valves cannot efficiently meet due to small switching cross sections and low dynamics, along with high energy consumption.
Innovation Solution
Designing the inlet and outlet valves as pressure-controlled 2/2-way switching valves with large switching cross sections, each equipped with at least one solenoid switching pilot valve for alternating control pressure, utilizing high and low control pressures for switching, and incorporating pilot valves as 2/2-way or 3/2-way solenoid switching valves to achieve high volume throughput and low energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If solenoid switching valves are used for inlet and outlet valves in ABS control, then the system structure is simple, but the switching cross section is small and switching dynamics are low, resulting in insufficient volume throughput for heavy wheeled vehicles
Solution Approach 1:
The valve system is segmented into pilot valves (solenoid switching) and main valves (pressure-controlled with large cross-section). The pilot valves control the main valves through pressure signals, separating the control function from the flow control function. This allows the main valves to have large switching cross sections for high volume throughput while the pilot valves remain simple solenoid structures.
Solution Approach 2:
Control pressure acts as an intermediary between the solenoid pilot valves and the main inlet/outlet valves. The pilot valves modulate control pressure, which then actuates the main valves to open or close. This intermediary mechanism enables high-speed switching through pressure waves while maintaining large flow cross-sections in the main valves.
2Productivity
If solenoid switching valves are used for ABS control, then the system is easy to control, but the switching frequency is limited and energy consumption is high
Solution Approach 1:
The ABS control operates through periodic opening and closing of the inlet and outlet valves in response to wheel speed modulation requirements. The pilot valves switch periodically at high frequency to modulate brake pressure, enabling rapid ABS control cycles. This periodic action allows high switching frequency while the system only consumes energy during switching transitions, not during sustained valve positions.
Solution Approach 2:
The system replaces direct high-power solenoid actuation of large valves with a pressure-controlled mechanism. Instead of using high-energy solenoids to directly move large valve components, the patent uses low-energy pilot solenoids to generate pressure signals that actuate the main valves. This substitution dramatically reduces energy consumption while enabling higher switching frequencies.
3Force
If large displacement volume actuating units are used in wheel brakes, then sufficient braking force is achieved, but the braking system requires power assistance and has larger component sizes
Solution Approach 1:
The patent utilizes hydraulic pressure from the vehicle's existing hydraulic system (used for implements or hydrostatic drive) to power the brake actuating units. The hydraulic pressure supply device provides the necessary force multiplication, enabling large braking forces to be generated without proportionally large actuating unit sizes. The hydraulic system acts as a force amplifier.
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
The solution enables high volume throughput and high ABS control frequency while minimizing energy consumption, effectively preventing wheel locking and maintaining vehicle braking and steerability.
Implementation Method 1
at least one solenoid switching pilot valve for alternating control pressure
Implementation Method 2
pressure-controlled 2/2-way switching valves with large switching cross sections
Data Source
Figure 1
Figure 1a
Figure 1b
AI summary
The invention relates to a power-assisted hydraulic braking system of a wheeled vehicle, having a main brake line (2), into which a setpoint brake pressure can be input by means of a brake valve (1) which can be actuated via a brake pedal, and from which a plurality of wheel brake lines (3) which lead in each case to an actuating unit (5) of a wheel brake (4) branch off, and having a valve arrangement (6) of an ABS controller, which valve arrangement (6) has in each case one inlet valve (7) which is arranged between the main brake line and one of the wheel brake lines, and an outlet valve (8) which is arranged between the relevant wheel brake line and a pressureless return line (9). In order to make the necessary high volumetric throughput possible in conjunction with a high ABS control frequency and a low energy consumption for the actuation for use in heavy wheeled vehicles which are provided for off-highway use, the inlet valve (7) and the outlet valve (8) are configured as pressure-controlled 2/2-way switching valves with correspondingly large switching cross sections. For actuation purposes, the inlet valve (7) and the outlet valve (8) are assigned in each case at least one pilot control valve (11, 12, 14, 15) which is configured as a solenoid switching valve and by means of which a control connector (13, 16) of the relevant inlet or outlet valve (7, 8) can be loaded alternately with a low or high control pressure for the purpose of switching over.