Automatic Transmission Hydraulic Shift Control With Fewer Valves
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Solution Overview
Problem
Current automatic transmission gear-shifting control systems are complex and inefficient due to the large number of slide valves and solenoid valves required, leading to potential misoperation and damage when clutches for odd or even gears are engaged.
Innovation Solution
A gear-shifting control system with a minimal number of components, including a main pump, gear-shifting control valve, switching valves, and solenoid valves, which allows for efficient gear shifting and safety control by selectively routing hydraulic pressure to achieve gear shifting for eight gears (seven forward and one reverse) without interrupting power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of slide valves and solenoid valves are used to realize gear-shifting control and safety control, then the control coverage is comprehensive, but the system becomes complicated and drive control efficiency is low
Solution Approach 1:
The patent combines gear-shifting control and safety control functions into a single integrated control system. The gear-shifting control valve integrates multiple control functions that previously required separate valves, reducing the total number of components while maintaining comprehensive control coverage for both gear shifting operations and safety protection.
Solution Approach 2:
The control valves in the patent are designed with multi-functional capabilities. The gear-shifting control valve can perform both gear-shifting control and safety control functions, making a single component serve multiple purposes and reducing overall system complexity while maintaining comprehensive control.
2Reliability
If multiple slide valves and solenoid valves are used to ensure safety control, then misoperation can be prevented, but the number of components increases and system efficiency decreases
Solution Approach 1:
The patent merges safety control functions into the existing gear-shifting control valve structure. The same valve that controls gear shifting also performs safety control by managing hydraulic pressure distribution, eliminating the need for separate safety valves and maintaining efficient drive control while ensuring comprehensive safety protection.
3Device complexity
If a minimal number of valves are used to simplify the system, then device complexity is reduced, but it becomes difficult to achieve both gear-shifting control and safety control
Solution Approach 1:
The gear-shifting control valve is designed as a multi-functional component that simultaneously performs gear-shifting control and safety control. By integrating multiple functions into a single valve, the system achieves simplicity in structure while maintaining comprehensive control functionality through the valve's ability to manage both normal operation and safety protection.
Solution Approach 2:
The control valve is divided into distinct control sections or positions that handle different functions. Within the single valve structure, different valve positions or internal passages are dedicated to gear-shifting control versus safety control, allowing functional segmentation that maintains comprehensive control while using minimal components.
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
The system simplifies the control of automatic transmissions by reducing the number of components, enhancing drive control efficiency and preventing misoperation by ensuring only odd or even gears are engaged when their respective clutches are active, thus improving safety and robustness.
Implementation Method 1
a gear-shifting control valve, the gear-shifting control valve has an inlet and two outlets, the gear-shifting control valve can switch between a first working position and a second working position, when the gear-shifting control valve is in the first working position, the inlet is in fluid communication with one of the two outlets
Implementation Method 2
a first gear switching valve, the first gear switching valve has two inlets and four outlets, the first gear switching valve can switch between a first working position and a second working position
Implementation Method 3
The gear-shifting control system includes a main pump and four gear-shifting cylinders
Data Source
Figure 1
AI summary
A gear-shifting control system of an automatic transmission includes a main pump, four gear-shifting cylinders, a gear-shifting control valve, a first gear switching valve, a second gear switching valve, a first gear on-off valve, and a second gear on-off valve. The gear-shifting control valve has an inlet and two outlets, the first gear switching valve has two inlets and four outlets, the second gear switching valve has two inlets and four outlets. The first gear on-off valve is connected between the first gear switching valve and the gear-shifting control valve, to disconnect or connect the gear-shifting control valve and the first gear switching valve. The second gear on-off valve is connected between the second gear switching valve and the gear-shifting control valve, to disconnect or connect the gear-shifting control valve and the second gear switching valve. The four outlets of the first gear switching valve and the four outlets of the second gear switching valve are connected with the four gear-shifting cylinders.