Hydraulic Circuit Fixation Detection via Pressure Thresholding
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Solution Overview
Problem
Existing methods for detecting the fixation of the partially discharged state in hydraulic circuits, such as those in vehicle automatic transmissions, are inaccurate and can only determine abnormalities when the vehicle is stopped, leading to potential misdiagnosis of oil pump issues.
Innovation Solution
An abnormality detection device and method that includes a switching unit, pressure regulator, pressure regulation controller, and hydraulic detector, which determines fixation by comparing detected hydraulic pressures to stored maximum discharge pressures in different operational states, allowing for accurate detection even when the vehicle is in motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the gear ratio method is used to determine oil pump fixation, then the detection can be performed, but the detection accuracy deteriorates due to misdiagnosis from other factors affecting gear ratio
Solution Approach 1:
The invention extracts the hydraulic pressure parameter from the complex gear ratio system to independently detect oil pump fixation. By measuring only the hydraulic pressure at the oil pump discharge port and comparing it against threshold values, the system isolates the oil pump's operational state from other transmission factors, thereby improving detection accuracy and eliminating misdiagnosis risks.
Solution Approach 2:
The invention introduces hydraulic pressure as an intermediary parameter between the oil pump and the detection system. Instead of directly monitoring gear ratio changes that are influenced by multiple factors, the hydraulic pressure serves as a direct indicator of oil pump discharge capacity, providing a more reliable basis for fixation detection.
2Measurement precision
If the vehicle stop condition is required for fixation detection, then the detection can be performed, but the detection timing is limited and productivity deteriorates
Solution Approach 1:
The invention transforms the static detection condition (vehicle must be stopped) into a dynamic detection capability that operates during vehicle operation. By continuously monitoring hydraulic pressure while the vehicle is running, the system can detect oil pump fixation in real-time without requiring the vehicle to stop, thereby improving detection availability and response time.
Solution Approach 2:
The invention enables continuous monitoring of hydraulic pressure during vehicle operation, allowing for ongoing detection of oil pump fixation. This continuous action replaces the intermittent detection that only occurs when the vehicle is stopped, ensuring that fixation can be identified at any operational moment and improving overall system productivity.
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
Enables precise detection of switching unit abnormalities in partially discharged states, improving diagnostic accuracy and preventing misidentification of oil pump issues during normal vehicle operation.
Implementation Method 1
a hydraulic detector that detects a hydraulic pressure regulated by the pressure regulator
Data Source
AI summary
An abnormality detection device for a hydraulic circuit including an oil pump, a switching unit switching between a fully discharged state and a partial discharge, a pressure regulator, a pressure regulation controller and a hydraulic detector, The device includes: a storage storing a maximum discharge pressure of oil capable of being discharged in the partially discharged state; a switching controller performing control of switching into the fully discharged state; and a determination unit determining that the switching unit has a fixation abnormality of the partially discharged state when a hydraulic pressure approximately corresponds to the maximum discharge pressure in the partially discharged state in a state where a hydraulic pressure higher than the maximum discharge pressure in the partially discharged state is set as a target hydraulic pressure and the pressure regulator is controlled in an effort to achieve the target hydraulic pressure after the switching control.