Transmission Hydraulic Accumulator Diagnostics Using Pressure Profiles
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Solution Overview
Problem
Existing hydraulic systems for dual-clutch transmissions require complex sensor systems to detect malfunctions in pressure accumulators, which increases complexity and reduces operational reliability.
Innovation Solution
A diagnostic module is integrated into the control unit to check the charging behavior of the pressure accumulator by comparing actual and reference accumulator pressure profiles, allowing for the detection of faults through analysis of pressure gradients and volume diagnostics, thereby reducing sensor system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex sensor systems are used to detect pressure accumulator malfunctions, then detection capability is improved, but device complexity increases
Solution Approach 1:
The pressure accumulator system performs self-diagnosis by utilizing existing sensors and the natural charging/discharging cycles. The diagnostic module analyzes pressure development during these cycles to detect malfunctions such as leakage or blocked discharge paths, eliminating the need for additional dedicated sensors while maintaining detection capability.
Solution Approach 2:
The existing pressure sensor and control unit are made multi-functional by adding diagnostic capabilities. The same sensor that monitors operational pressure is also used for fault detection, and the control unit executes both operational control and diagnostic analysis, reducing overall sensor system complexity while improving detection capability.
2Reliability
If additional diagnostic sensors are added to monitor accumulator pressure, then reliability is improved, but device complexity increases
Solution Approach 1:
The system implements feedback by continuously monitoring pressure during charging and discharging cycles and comparing actual pressure development against expected patterns. The diagnostic module detects deviations that indicate malfunctions, providing reliable operation monitoring without adding complex sensor systems.
Solution Approach 2:
The diagnostic module performs preliminary analysis of pressure patterns during normal operation to detect potential failures before they occur. By analyzing the charging behavior and pressure development in advance, the system can identify issues like leakage or blocked paths early, improving reliability without requiring additional sensors.
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 ensures operational reliability of the pressure accumulator with reduced sensor complexity by accurately diagnosing faults and ensuring correct accumulator pressure and volume functionality, improving overall system performance.
Implementation Method 1
The preloading is achieved, for example, by a gas pressure or alternatively by a spring
Implementation Method 2
The preloading is achieved, for example, by a gas pressure or alternatively by a spring
Implementation Method 3
The hydraulic system also includes a hydraulic charge pump, which delivers hydraulic fluid into the hydraulic system in a charging operation in order to increase the accumulator pressure
Implementation Method 4
The control unit is preferably assigned a pressure sensor (DE 10 2013 003894 A1), with which the hydraulic pressure applied to the clutch hydraulic cylinder can be detected
Implementation Method 5
a control valve is positioned, which can be controlled by an electronic control unit and can be used to adjust the hydraulic pressure applied to the clutch hydraulic cylinder
Data Source
AI summary
A hydraulic system for an automatic transmission of a motor vehicle, with which hydraulic cylinders of at least one clutch, and of gear selectors can be actuated, which hydraulic system includes a pressure accumulator for providing an accumulator pressure in the hydraulic system. In at least one clutch path leading from the pressure accumulator to the clutch hydraulic cylinder, a clutch valve, which can be operated by an electronic control unit, and with which a hydraulic pressure applied to the clutch hydraulic cylinder can be adjusted, and a pressure sensor, with which the hydraulic pressure applied to the clutch hydraulic cylinder can be detected, are arranged, and having a charging hydraulic pump, which delivers hydraulic fluid into the hydraulic system in a charging process to increase the actual accumulator pressure.