Hydrodynamic Retarder Multi-Function Valve Pressure Control
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Solution Overview
Problem
Current hydrodynamic retarder control systems can experience excess pressures and energy absorption due to contamination or malfunctions, leading to higher oil temperatures and inefficient energy dissipation.
Innovation Solution
A multi-function valve assists the regulator valve to control pressure within the retarder cavity, regulating both flow and output pressure, and taking over in case of regulator valve malfunction to prevent excess retardation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional relay valve is used to conduct fluid from the regulator valve to the retarder flow valve, then the system structure is simple, but the system cannot prevent excess pressures within the retarder cavity when the regulator valve malfunctions
Solution Approach 1:
The patent applies multi-functionality by designing a regulator valve that performs both its primary function of controlling discharge oil pressure and a secondary function of acting as a check valve to prevent excess pressures. The regulator valve includes a ball check valve mechanism that allows normal discharge flow while blocking reverse flow that would cause excess pressure, thereby eliminating the need for a separate safety valve and improving reliability without proportionally increasing complexity.
Solution Approach 2:
The patent introduces a ball check valve as an intermediary element within the regulator valve assembly. This ball check valve acts as a mediator that automatically prevents excess pressure by blocking the flow path when pressure exceeds normal operating levels, providing passive safety without requiring additional active control components or increasing system complexity significantly.
2Productivity
If the regulator valve remains in the open position due to contamination or malfunction, then the system operates continuously, but the retarder cavity is subjected to higher than needed pressures resulting in higher oil temperatures
Solution Approach 1:
The patent applies preliminary anti-action by incorporating a ball check valve mechanism that proactively prevents excess pressure buildup before it can cause harmful effects. The ball check valve is positioned to automatically close and block the flow path when pressure exceeds normal levels, preventing the condition that would lead to excessive oil temperature even if the regulator valve remains stuck in the open position due to contamination or malfunction.
3Reliability
If a multi-function valve is added to assist the regulator valve and prevent excess pressures, then pressure control reliability is improved, but the device complexity increases
Solution Approach 1:
The patent applies merging by integrating the ball check valve functionality directly into the existing regulator valve assembly. The ball check valve mechanism is combined with the regulator valve's discharge oil control function, creating a unified component that performs both pressure regulation and excess pressure prevention. This merging approach improves reliability by adding the safety function without requiring a completely separate valve system, thereby limiting the increase in complexity to only the additional ball check mechanism rather than an entirely separate multi-function valve.
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 effectively prevents excess pressures and maintains controlled energy dissipation, ensuring safe and efficient operation by regulating pressure within acceptable ranges, alerting operators to potential malfunctions.
Implementation Method 1
The regulator valve generally controls the discharge oil from the retarder. By controlling the retarder pressure, the energy dissipation is also controlled.
Implementation Method 2
The hydrodynamic retarder converts the energy of the driveline into heat and dissipates it using the transmission oil cooling system.
Implementation Method 3
The hydrodynamic retarder converts the energy of the driveline into heat and dissipates it using the transmission oil cooling system.
Implementation Method 4
the retarder multi-function valve serves to both energize the retarder system by controlling the retarder flow valve and also by regulating the retarder output pressure in the event of a malfunction in the retarder regulator valve
Data Source
AI summary
A hydrodynamic retarder control apparatus includes two valve spools, one, a retarder control valve, functions as a relay valve to control the on/off operation of a hydrodynamic retarder and the other, a regulator valve, functions to control the regulation of pressure at the hydrodynamic retarder. During abnormal periods of operation of the regulator valve, the retarder control valve will also function as a pressure control valve thereby limiting the maximum pressure at the hydrodynamic retarder.