Hydraulic Pump Leakage Detection via Auxiliary Pump Speed Monitoring
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Solution Overview
Problem
Oil leakage in main pumps driven by internal combustion engines occurs due to reversal of crankshaft rotation during engine stopping, leading to undefined rotational speeds and pressure in electric auxiliary pumps, compromising transmission durability.
Innovation Solution
A method that detects oil leakage by monitoring the rotational speed of the electric auxiliary pump, recording errors and demanding engine start when thresholds are exceeded, ensuring leak detection and prevention of pump reversal-induced damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the internal combustion engine stops, then fuel consumption is reduced, but oil leakage occurs due to crankshaft rotation reversal
Solution Approach 1:
The patent applies preliminary action by detecting crankshaft rotation reversal before it causes significant oil leakage, and by preparing the auxiliary pump system in advance to compensate for the leakage. The detection method monitors rotation direction changes during engine stopping, allowing the system to activate the auxiliary pump proactively to maintain oil pressure and prevent transmission damage.
2Quantity of substance
If the main pump is used during engine stopping, then oil supply is maintained, but oil leakage increases due to reverse rotation
Solution Approach 1:
The patent introduces the auxiliary pump as an intermediary device to transfer oil supply function from the leaking main pump during reverse rotation. When crankshaft reversal is detected, the auxiliary pump takes over the oil supply task, allowing the main pump to continue operating in reverse without causing transmission oil pressure loss, thus preventing both oil leakage and maintaining oil supply.
Solution Approach 2:
The patent applies parameter changes by switching the active pump based on rotation direction parameters. The system monitors crankshaft rotation direction and changes which pump is active - using the main pump during normal rotation and switching to the auxiliary pump during reverse rotation, thereby adapting the system behavior to the changing operational parameters.
3Reliability
If the auxiliary pump operates alone, then oil leakage is prevented, but rotational speed becomes undefined affecting transmission durability
Solution Approach 1:
The patent implements feedback by continuously monitoring the rotational speed of the auxiliary pump and comparing it against expected operational ranges. When the auxiliary pump operates during engine stopping, the system detects its rotational speed and uses this feedback to identify abnormal conditions indicating main pump leakage, allowing for precise diagnostic measurement and appropriate system response.
Data Source
AI summary
A method for detecting an oil leakage of a main pump during a stopping process of an internal combustion engine, where the oil leakage is caused by a reversal of a direction of rotation of a crankshaft of a vehicle including an electric auxiliary pump and the main pump, where the main pump is driven by the internal combustion engine of the vehicle. The method includes determining whether a rotational speed of the electric auxiliary pump exceeds a predefined threshold value, and when the rotational speed of the electric auxiliary pump exceeds the predefined threshold value for the rotational speed, detecting that the main pump is leaking, recording an error in an error memory of the vehicle, and demanding an engine start.