Hydraulic Circuit Switching Unit Fixation Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hydraulic circuit systems for automatic transmissions face challenges in detecting fixation abnormalities in switching units that switch between fully and partially discharged states without relying on predetermined engine revolution conditions, leading to increased oil pump load and inefficient fuel consumption.
Innovation Solution
An abnormality detection device and method that includes a storage unit for maximum discharge pressures, a switching control unit, a pressure regulation control unit, and a determination unit to compare detected oil pressure with stored maximum discharge pressures, allowing for simple detection of fixation abnormalities in switching units by setting a target hydraulic pressure higher than the maximum discharge pressure in the partially discharged state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a switching unit is fixed in a fully discharged state to ensure reliable oil discharge, then the reliability of hydraulic pressure supply is improved, but the oil pump load increases and fuel efficiency deteriorates
Solution Approach 1:
The switching unit is designed to dynamically switch between fully discharged state and partially discharged state based on actual hydraulic pressure requirements. The control unit receives pressure sensor signals and automatically adjusts the switching unit position, enabling the system to adapt between high reliability mode (fully discharged) and energy-efficient mode (partially discharged), thereby resolving the contradiction between reliability and fuel efficiency
Solution Approach 2:
The system changes the discharge state parameter of the oil pump based on detected hydraulic pressure conditions. When pressure is sufficient, the system transitions to partially discharged state to reduce pump load and improve fuel efficiency. When pressure drops below threshold, it switches to fully discharged state to ensure reliability, thus dynamically optimizing the parameter to balance reliability and energy consumption
2Measurement precision
If a fixation determination device using electromagnetic valves and predetermined engine revolution conditions is used to detect switching unit fixation, then the detection accuracy is improved, but the device complexity and operational constraints increase
Solution Approach 1:
The invention extracts the essential detection function from a complex multi-component system. Instead of using electromagnetic valves, engine revolution sensors, and multiple switching valves as in prior art, this system uses only the existing pressure sensor and control unit to detect fixation abnormalities by monitoring whether hydraulic pressure reaches the target value, thereby achieving accurate detection with minimal additional complexity
Solution Approach 2:
The system uses its own existing pressure sensing and control capabilities to perform self-diagnosis of switching unit fixation. The control unit leverages the pressure sensor already present in the hydraulic system to detect whether the switching unit is properly functioning, eliminating the need for separate dedicated detection devices and reducing overall system complexity while maintaining detection accuracy
Data Source
AI summary
Abnormality detection device for a hydraulic circuit with oil pump capable of increasing pressure of oil sucked through a suction port and discharging the oil through discharge ports; a switching unit switching between fully and partially discharged states; a pressure regulation unit regulating oil pressure; and a hydraulic pressure detection unit that detects the oil pressure includes: a storage unit that stores a maximum discharge pressure in the partially discharged state; a switching control unit that switches to either one of the discharged states; a pressure regulation control unit that sets a target pressure higher than the maximum discharge pressure in the partially discharged state, and performs pressure regulation control to achieve the target pressure; and a determination unit that determines whether the switching unit has a fixation abnormality in one of the discharged states by comparing hydraulic pressure with maximum discharge pressure in the partially discharged state.