Hydraulic Pump Control for Transmission Fluid Filtration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hydraulic circuits for motor vehicle transmissions, particularly automatic or automated transmissions, are not optimally configured to efficiently filter out contamination from hydraulic oil, leading to delayed purification and potential contamination issues.
Innovation Solution
The method involves continuing to pump fluid through the first filter device after the pressure relief valve opens, using the first return line with a pressure-limiting valve to temporarily return fluid back into the reservoir or an additional filter circuit for further filtering, thereby increasing filter throughput and purity of hydraulic oil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the fluid pump is switched off when the pressure relief valve opens, then energy consumption is reduced, but the filter throughput is insufficient and contamination is not filtered out quickly enough
Solution Approach 1:
The patent applies dynamics by making the pump operation flexible rather than static. The pump can be switched off during normal operation to save energy, but can be dynamically reactivated when additional filtering is needed. This dynamic control allows the system to adapt between energy saving mode and high-performance filtering mode based on contamination levels and operational requirements.
Solution Approach 2:
The patent implements periodic action by using cyclic pump operation. The pump runs intermittently rather than continuously, creating periodic filtering cycles. During normal operation, the pump may be off, but it can be activated periodically to perform additional filtering passes through the first filter device, thereby removing contamination without requiring continuous energy consumption.
2Productivity
If the pump runs continuously, then filter throughput is maximized, but energy consumption increases unnecessarily
Solution Approach 1:
The system applies self-service by using the pressure relief valve's operation as a trigger signal. When the pressure relief valve opens, it indicates that the system pressure has reached a certain level, which automatically triggers the pump to run again for additional filtering. This self-triggered operation eliminates the need for continuous monitoring and control, allowing the system to service itself based on its own operational states.
Solution Approach 2:
The patent uses parameter changes by monitoring system pressure as the key parameter. The pump operation is controlled based on pressure thresholds - when pressure reaches the relief valve opening pressure, the pump is activated for additional filtering. This parameter-based control allows the system to optimize between energy consumption and filtering performance by reacting to actual system conditions rather than operating continuously at fixed parameters.
3Productivity
If the pump is reactivated after pressure relief valve opening, then additional filtering is achieved, but system pressure must be increased above the relief valve opening pressure
Solution Approach 1:
The patent applies preliminary action by preparing the system in advance for additional filtering. The pressure relief valve is pre-configured with a specific opening pressure, and the system is designed to allow pressure to build up to this level before triggering the pump for additional filtering. This preliminary setup ensures that when the pump is activated, it does so at the optimal pressure point, maximizing filtering efficiency without requiring excessive pressure increases.
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 enhances the purity of hydraulic oil by increasing filter throughput, ensuring faster fluid cleaning and improved hydraulic component functionality, while maintaining a cost-effective and structurally simple configuration without additional design effort or energy consumption.
Implementation Method 1
the hydraulic oil being filtered during pumping with at least the filter device
Implementation Method 2
after an opening pressure of the pressure relief valve is reached, the pressure relief valve is opened
Implementation Method 3
the first return line arranged downstream of the fluid pump, the fluid being pumped out of the reservoir with the fluid pump
Data Source
Figure 1
AI summary
The invention relates to a method for the hydraulic control of a motor vehicle transmission, particularly an automatic or automatized motor vehicle transmission, more particularly a double-clutch transmission, comprising an hydraulic circuit (1). According to the invention, a control system (9) is supplied with a fluid from a supply system (5) and comprises at least one actuator (12, 13, 14, 15, 16, 17) for the control of the motor vehicle transmission. The supply system (5, 6, 7, 8) comprises a reservoir (19), a fluid pump (20), at least one first filtering device (21) and at least one first return line (24, 27, 28, 29) arranged downstream of the fluid pump (20), wherein the fluid is pumped by the fluid pump (20) from the reservoir (19) and is filtered during the pumping process by at least one first filtering device (21). A first return line (24) comprises a pressure limiting valve (DBV), wherein said pressure limiting valve (DBV) is opened when an opening pressure of the pressure limiting valve (DBV) is reached. In order to reduce the pollution of the fluid in a simple and cost-effective manner, the fluid pump (20) is continuously supplying fluid for filtering even after the opening pressure of the pressure limiting valve (DBV) has been reached, thereby increasing the service life of the fluid pump (20) in an artificial manner.