Transmission Oil Filter Contamination Model
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Solution Overview
Problem
Existing oil filter systems for transmission oils do not adequately account for dirt contamination introduced during production and wear, leading to inefficient filtration and energy consumption.
Innovation Solution
A contamination model is used to determine the degree of oil contamination based on pump flow rate, clutch energy input, and transmission mileage, activating the hydraulic pump only when necessary to filter the oil, thereby optimizing filtration and energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hydraulic pump is continuously operated to filter the transmission oil, then the oil filtration quality is improved, but the energy consumption increases
Solution Approach 1:
The hydraulic pump operates dynamically based on contamination levels rather than continuously. The control device activates the pump only when the calculated contamination degree exceeds a threshold, adapting the operation to actual oil quality conditions and reducing unnecessary energy consumption.
Solution Approach 2:
The system uses self-generated data (pump flow rate, clutch energy input, transmission mileage) to calculate contamination levels and control pump operation autonomously without requiring external sensors or manual monitoring, enabling energy-efficient self-regulated filtration.
2Measurement precision
If complex contamination detection devices are used to detect the degree of oil contamination, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
Instead of directly measuring contamination with complex sensors, the system uses an intermediary calculation approach based on contamination models that process readily available operational data (pump flow rate, clutch energy input, transmission mileage) to estimate contamination levels indirectly.
Solution Approach 2:
The patent replaces physical contamination sensors with a computational model that calculates contamination degrees using operational parameters. This substitutes mechanical/sensor-based detection with a mathematical approach, simplifying the physical device while maintaining measurement capability.
3Device complexity
If the hydraulic pump is operated based on pressure requirements only, then the system simplicity is maintained, but the oil filtration effectiveness deteriorates
Solution Approach 1:
The control device uses feedback from operational parameters (pump flow rate, clutch energy input, transmission mileage) to calculate contamination levels and adjust pump operation accordingly. This feedback mechanism ensures filtration effectiveness while maintaining system simplicity by using existing sensor data.
Solution Approach 2:
The contamination model is pre-programmed with calculation rules and threshold values during system design. The control device applies these pre-established criteria to determine when filtration is needed, eliminating complex real-time decision-making while ensuring appropriate filtration effectiveness.
Data Source
Figure 1
AI summary
The invention relates to a method for operating an oil filter system (3) for a transmission oil of a transmission assembly (1) with a clutch or brake, comprising a filter circuit with at least one oil filter (7) and a hydraulic pump (5) with an electric or electrically superimposed drive and a control device (6, 10), wherein the drive of the hydraulic pump (5) is controlled and switched on by the latter. According to the invention, the current degree of contamination Va (%) of the transmission oil is determined indirectly by a contamination model, with Va%=VStartIW%-A%+B%+C% where A(%) = f (pump delivery rate), B(%) = f (clutch energy input), and C(%) = f (transmission mileage).If the pollution threshold VS(%) is exceeded, the drive of the hydraulic pump (5) is switched on until the pollution degree threshold VS(%) reduced by a fixed hysteresis value VH(%) of the currently determined pollution degree Va(%) is reached or undercut by the decrement in the pollution model with A(%).