Variable Phase Control for Hydraulic Brake Selector Valve Noise
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Solution Overview
Problem
Existing hydraulic brake system valve control methods result in excessive noise and thermal load due to fixed duration control phases, leading to unnecessary valve switching and high electrical power consumption.
Innovation Solution
Adapting the duration of control phases (tV, tH, tR) of the selector valve based on instantaneous braking parameters such as setpoint speed, setpoint pressure gradient, and differential pressure to optimize noise production and thermal load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed duration control phases are used for the selector valve, then the valve control is simple, but noise and thermal load increase due to unnecessary valve switching
Solution Approach 1:
The patent applies dynamics by making the control phase durations (tV, tH, tR) variable instead of fixed. The control method adapts these time parameters based on the actual braking situation, allowing the valve control to dynamically adjust to different operating conditions. This reduces unnecessary valve switching and associated noise and thermal load while maintaining reliable brake function.
Solution Approach 2:
The patent changes the parameter of control phase duration from fixed to variable. By adjusting the durations of control phase tV, holding phase tH, and refresh pulse tR based on braking parameters, the system optimizes valve operation. This parameter adaptation allows the valve to remain open longer when conditions permit, reducing switching frequency and harmful effects.
2Device complexity
If fixed duration control phases are used for the selector valve, then the control method is simple, but electrical power consumption increases
Solution Approach 1:
The control method dynamically adjusts the duration of control phases based on the braking situation. By extending holding phases tH when the valve can remain open, the system reduces the frequency of refresh pulses tR, thereby lowering electrical power consumption while maintaining adequate brake pressure.
Solution Approach 2:
The patent varies the time parameters tV, tH, and tR according to braking conditions. When the braking situation allows, the holding phase tH is extended and refresh pulses are reduced, directly decreasing electrical power consumption without compromising brake system reliability.
3Productivity
If the valve opens quickly and widely, then sufficient brake fluid is supplied to the hydraulic pump, but the valve switches more often causing higher noise and thermal load
Solution Approach 1:
The system dynamically balances valve opening speed with holding duration. The valve opens quickly and widely to ensure sufficient brake fluid supply, but the holding phase tH is extended to maintain this state longer, reducing the frequency of subsequent switching operations and associated harmful effects.
Solution Approach 2:
The patent extends the holding phase tH to maintain continuous valve opening when braking conditions permit. This continuity reduces the need for repeated opening-closing cycles, ensuring adequate brake fluid supply while minimizing noise and thermal load from frequent switching.
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
Reduces noise and thermal load by optimizing valve control according to the driving situation, minimizing unnecessary valve switching and electrical power consumption.
Implementation Method 1
it is known to actuate HSV 3 with the aid of an electrical signal having various phases
Implementation Method 2
Hydraulic pump 4, which is situated downstream from HSV 3, is able to transport brake fluid from brake master cylinder 1 to wheel brakes 5
Implementation Method 3
This causes the differential pressure prevailing on valve 3 to be reduced slowly. Since the differential pressure applied to HSV 3 has the effect of closing HSV 3
Data Source
AI summary
In a method for controlling a selector valve situated in a hydraulic brake system of a motor vehicle, the selector valve is opened by applying an electrical signal having various control phases having different current intensities. The thermal load and the noise of the valve are significantly improved if the lengths of the control phases for the pilot stage or the holding phases are variably adapted to the driving situation.