Transmission Hydraulic Assembly With Threshold-Charged Accumulator
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Solution Overview
Problem
Hydraulic systems in vehicle transmissions face instability, particularly during high, short-term, or fluctuating volume flow demands, such as clutch actuation or when the engine is stopped, leading to inadequate system pressure and reduced functionality.
Innovation Solution
A hydraulic assembly with a pressure accumulator and a valve assembly that charges the accumulator when system pressure reaches a predetermined threshold, ensuring stable pressure supply and preventing unnecessary charging, thereby enhancing hydraulic stability and clutch control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure accumulator is continuously connected to the hydraulic circuit, then pressure support is available, but unnecessary charging occurs and hydraulic stability deteriorates
Solution Approach 1:
A valve assembly is introduced as an intermediary component between the pressure accumulator and the hydraulic circuit. This valve assembly selectively controls the charging and discharging of the pressure accumulator, allowing it to act as a mediator that enables beneficial pressure support while preventing harmful unnecessary charging that would destabilize the hydraulic system.
2Speed
If the pressure accumulator charges quickly, then pressure recovery is faster, but pressure drops in the hydraulic circuit increase
Solution Approach 1:
The valve assembly is configured to enable preliminary charging of the pressure accumulator to a predetermined pressure level before high-demand operations occur. This preliminary action ensures that when clutch actuation or high-flow demands occur, the pressure accumulator can immediately provide pressure support without causing severe pressure drops in the hydraulic circuit.
3Reliability
If system pressure is maintained at high levels, then clutch control is optimized, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts pressure levels using the valve assembly to control when the pressure accumulator charges and discharges. Instead of maintaining constantly high pressure, the system allows pressure to fluctuate within acceptable ranges and uses the pressure accumulator to provide supplemental pressure only when needed for clutch control, thereby reducing overall energy consumption while maintaining clutch control stability.
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 provides improved hydraulic stability and faster pressure recovery in the hydraulic circuit, optimizing clutch control and reducing pressure drops, even during varying operating states.
Implementation Method 1
a pressure reservoir (30) for temporarily supplying pressure to the hydraulic circuit
Implementation Method 2
The valve assembly is configured such that it effects charging of the pressure accumulator as soon as, with increasing system pressure, a predetermined pressure threshold value of the system pressure is reached or exceeded
Data Source
AI summary
A hydraulic assembly for a vehicle transmission includes a hydraulic pump for providing a system pressure within a hydraulic circuit, a pressure accumulator for temporarily supplying pressure to the hydraulic circuit, and a valve assembly for charging the pressure accumulator after a predetermined pressure threshold value of the system pressure has been reached or exceeded. The valve assembly is hydraulically connected between the pump and the pressure accumulator.