Hydraulic Control Device Single Solenoid Valve Switching
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Solution Overview
Problem
The existing automatic transmission systems with multiple solenoid valves for hydraulic control are bulky and heavy due to the need for individual solenoid valves for each engagement element, making it difficult to reduce size and weight.
Innovation Solution
A hydraulic control device that uses a single solenoid valve to supply engagement pressure to both the synchronization mechanism and the engagement element, with a switching valve to selectively direct the pressure, reducing the number of solenoid valves required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual solenoid valves are provided for each engagement element (synchronization mechanism and engagement element), then each element can be controlled independently and reliably, but the number of solenoid valves increases, making the valve body larger and heavier
Solution Approach 1:
A single solenoid valve is designed to control multiple engagement elements (synchronization mechanism and engagement element) by switching hydraulic pressure to different circuits. This multi-functional approach reduces the total number of solenoid valves needed, thereby decreasing valve body weight and size while maintaining control reliability through proper switching mechanisms.
2Weight of stationary object
If a single solenoid valve is used to control multiple engagement elements, then the valve body size and weight are reduced, but the complexity of the hydraulic control circuit increases
Solution Approach 1:
A switching valve is introduced as an intermediary component to manage the hydraulic pressure distribution from the single solenoid valve to multiple engagement elements. This switching valve simplifies the overall control architecture by providing a dedicated mechanism for routing pressure, reducing the complexity that would otherwise arise from a single solenoid valve directly controlling multiple elements.
3Ease of operation
If four solenoid valves are provided to control four engagement elements (first clutch, second clutch, synchronization mechanism, and brake), then each element can be precisely controlled, but it becomes difficult to reduce the size and weight of the valve body
Solution Approach 1:
The patent applies multi-functionality by designing a single solenoid valve system that can control multiple engagement elements through a switching mechanism. This reduces the valve body volume significantly compared to having four separate solenoid valves, while maintaining precise control capability through the switching valve that directs hydraulic pressure to the appropriate engagement element based on operational requirements.
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 reduces the size and weight of the hydraulic control device by allowing a single solenoid valve to serve multiple engagement elements, enhancing efficiency and compactness.
Implementation Method 1
a first solenoid valve capable of supplying the engagement pressure
Implementation Method 2
a switching valve capable of supplying the engagement pressure, which is supplied from the first solenoid valve, switchably to one of the synchronization mechanism and the engagement element
Data Source
AI summary
A hydraulic control device where the engagement pressure which is supplied from the first solenoid valve is supplied to the synchronization mechanism in the case where the signal pressure is not supplied to the switching valve, and the engagement pressure which is supplied from the first solenoid valve is supplied to the engagement element and the source pressure is supplied to the synchronization mechanism as the engagement pressure in the case where the signal pressure is supplied to the switching valve.