Transmission Hydraulics Controller Bypass Oil Passage
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Solution Overview
Problem
Conventional automatic transmission hydraulic control systems face issues with foreign substance accumulation in hydraulic control valves, leading to potential malfunctions and operability degradation, as increasing the cleaning control operation amount can cause friction engagement elements to malfunction due to increased hydraulic pressure.
Innovation Solution
A transmission hydraulics controller with a manual valve, hydraulic control valve, and an electric actuator-driven range switch mechanism, incorporating a normal oil passage and a bypass oil passage that allows switching the hydraulic pressure supply route to the friction engagement elements, enabling effective cleaning control without affecting the hydraulic pressure applied to the friction engagement elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the operation amount of the hydraulic control valve cleaning control is increased to improve foreign substance removal effectiveness, then the cleaning effectiveness is improved, but the hydraulic pressure applied to friction engagement elements increases causing malfunctions
Solution Approach 1:
The hydraulic control system is segmented into two independent pathways: a normal oil passage for regular hydraulic control and a bypass oil passage dedicated to cleaning operations. This segmentation allows the cleaning control to operate independently without affecting the hydraulic pressure stability required by friction engagement elements, thereby resolving the contradiction between cleaning effectiveness and system stability.
Solution Approach 2:
The manual valve serves as an intermediary component that directs hydraulic oil flow to either the normal oil passage or the bypass oil passage. During cleaning control, the manual valve routes oil through the bypass passage, enabling the hydraulic control valve to perform aggressive cleaning operations while the friction engagement elements remain protected from pressure fluctuations through the stable normal passage.
2Reliability
If the operation amount of the hydraulic control valve cleaning control is increased to prevent foreign substance accumulation, then the cleaning effectiveness is improved, but the device complexity increases
Solution Approach 1:
The manual valve, which already exists for range switching operations, is given an additional function of routing hydraulic oil to the bypass passage during cleaning control. This multi-functionality approach allows the system to achieve effective cleaning operations without adding dedicated new components, thereby preventing foreign substance accumulation while minimizing increases in device complexity.
Solution Approach 2:
The cleaning control functionality is merged into the existing hydraulic control architecture by utilizing the manual valve and creating a bypass passage that works in conjunction with the normal oil passage. This integration allows the system to achieve enhanced cleaning effectiveness while avoiding the complexity of a completely separate cleaning system.
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
This configuration allows for increased effectiveness in preventing foreign substance accumulation without causing malfunctions in friction engagement elements, while also reducing the need for a dedicated motive power source and enhancing energy efficiency.
Implementation Method 1
a hydraulic control valve that controls a hydraulic pressure applied to the friction engagement elements
Implementation Method 2
a bypass oil passage that supplies hydraulic pressure to the friction engagement element while bypassing the hydraulic control valve
Data Source
AI summary
A normal oil passage that supplies hydraulic pressure to a friction engagement element through a hydraulic control valve, and a bypass oil passage that supplies hydraulic pressure to the friction engagement element while bypassing the hydraulic control valve, are provided. By switching an operative position of a manual valve, a hydraulic pressure supply route to the friction engagement element is switched between the normal oil passage and the bypass oil passage. By switching to the bypass oil passage, the hydraulic pressure supplied to the friction engagement element is not affected by operation of the hydraulic control valve, and a cleaning control may be performed to cause the hydraulic control valve to perform a cleaning operation. Accordingly, even if an operation amount of the cleaning control for the hydraulic control valve is increased, malfunctions by the friction engagement element will not occur.