Parallel Solenoid Valves for Automated Transmission Control
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Solution Overview
Problem
Existing hydraulic or pneumatic control devices for automated manual transmissions face issues with high costs, poor control properties, and operational reliability due to the large and prone-to-failure main shut-off valve, which is required to handle high pressure medium demands and is vulnerable to faults.
Innovation Solution
The implementation of multiple small, directly controllable 2/2-way solenoid switching valves in parallel between the main pressure line and the pressure line, allowing for demand-dependent activation based on pressure medium requirements, ensuring continued functionality even if one valve fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single large main shut-off valve is used to handle high pressure medium requirements, then the pressure medium supply capability is improved, but the operational reliability deteriorates due to valve failures and the control properties worsen due to pronounced hysteresis
Solution Approach 1:
The single large main shut-off valve is divided into multiple smaller main shut-off valves (first main shut-off valve and second main shut-off valve) connected in parallel between the main pressure line and the pressure line. Each valve handles a portion of the pressure medium flow, reducing individual valve size and improving reliability while maintaining total flow capacity.
2Quantity of substance
If a single large main shut-off valve is used to handle high pressure medium requirements, then the pressure medium supply capability is improved, but the control properties worsen due to pronounced hysteresis
Solution Approach 1:
The single large main shut-off valve is divided into multiple smaller main shut-off valves (first main shut-off valve and second main shut-off valve) connected in parallel between the main pressure line and the pressure line. Each valve handles a portion of the pressure medium flow, reducing individual valve size and improving reliability while maintaining total flow capacity.
3Quantity of substance
If a single large main shut-off valve is used to handle high pressure medium requirements, then the pressure medium supply capability is improved, but the mechanical loads and wear increase
Solution Approach 1:
The single large main shut-off valve is divided into multiple smaller main shut-off valves (first main shut-off valve and second main shut-off valve) connected in parallel between the main pressure line and the pressure line. Each valve handles a portion of the pressure medium flow, reducing individual valve size and improving reliability while maintaining total flow capacity.
Solution Approach 2:
Multiple smaller main shut-off valves are combined in parallel configuration to achieve the total flow capacity of a single large valve while reducing mechanical loads on each individual valve. The parallel arrangement allows the system to handle high pressure medium requirements without subjecting any single valve to excessive mechanical stress.
4Reliability
If multiple small main shut-off valves are used in parallel, then the operational reliability is improved, but the device complexity increases
Solution Approach 1:
The single large main shut-off valve is divided into multiple smaller main shut-off valves (first main shut-off valve and second main shut-off valve) connected in parallel between the main pressure line and the pressure line. Each valve handles a portion of the pressure medium flow, reducing individual valve size and improving reliability while maintaining total flow capacity.
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 design enhances controllability and operational reliability by reducing mechanical loads, minimizing wear, and maintaining control device functionality with reduced dynamics in case of valve failures, while also lowering procurement and logistics costs.
Implementation Method 1
at least two small, directly controllable 2/2-way solenoid switching valves are arranged parallel to one another between the main pressure line (8) and the pressure line (26)
Data Source
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AI summary
The invention relates to a hydraulic or pneumatic control device of an automated shift transmission, which control device comprises actuating devices with actuating cylinders (15, 16) with pressure spaces (19a, 19b; 20a, 20b), wherein the pressure spaces (19a, 19b; 20a, 20b) of the actuating cylinders (15, 16) can in each case be connected by means of a control valve (22a, 22b; 32a, 32b) to a pressure line (26), and the pressure line (26) can be selectively connected to or blocked off from a main pressure line (8) by means of a main shut-off valve (45a). In order to improve the control properties and increase the operational reliability, at least one further main shut-off valve (45b) is arranged, parallel to the first main shut-off valve (45a), between the main pressure line (8) and the pressure line (26).