Automatic Transmission Control Apparatus for Shifting Time Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional dual clutch automatic transmission systems face inefficiencies in shifting time due to sequential operation of odd and even-numbered speed solenoid valves, which hinder concurrent pre-shift operations and prolong gear shifting times, especially when shifting between higher and lower gear ratios.
Innovation Solution
The control apparatus reconfigures the hydraulic pressure supply to allow simultaneous operation of speed selecting mechanisms for odd and even-numbered gears by using distinct pressure regulators for different gear sets, enabling concurrent pre-shift operations and reducing shifting time by optimizing the engagement and disengagement of clutches and synchronizing mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the first linear solenoid valve (LS1) is used for the shifting of the odd-numbered speed and the second linear solenoid valve (LS2) is used for the shifting of the even-numbered speed, then the speed selecting mechanisms can be controlled selectively, but it becomes impossible to concurrently conduct the operation (energizing) of the first linear solenoid valve (LS1) which prolongs the shifting time
Solution Approach 1:
The patent divides the control system into two independent pressure supply paths: one for odd-numbered speed selecting mechanisms (controlled by LS1) and another for even-numbered speed selecting mechanisms (controlled by LS2). This segmentation allows simultaneous operation of both solenoid valves without interference, enabling concurrent pre-shift operations for both odd and even speeds, thereby resolving the time loss issue while maintaining selective control capability
Solution Approach 2:
The patent implements pre-shift operations by energizing the appropriate linear solenoid valve (LS1 or LS2) in advance before the actual gear shift is needed. This preliminary action prepares the speed selecting mechanisms ahead of time, allowing the transmission to skip intermediate gears and perform direct shifts (e.g., from 7th to 3rd gear), significantly reducing the overall shifting time
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 significantly shortens the time required for shifting by allowing continuous pre-shift operations across odd and even-numbered gears, enhancing the efficiency and responsiveness of the transmission system.
Implementation Method 1
first and second linear solenoid valves LS1, LS2 (electromagnetic control valves; hydraulic pressure regulators) adapted to control hydraulic pressure supply to the first and second clutches CL1, CL2 and speed selecting mechanisms
Implementation Method 2
hydraulic pressure supply control unit including first and second pressure regulators interposed at a hydraulic pressure circuit connecting a hydraulic pressure source to the speed selecting mechanisms
Data Source
AI summary
In a control apparatus for an automatic transmission having multiple speeds constituted by four sets and speed selecting mechanisms corresponding to the four sets, assuming the speeds as seven among eight speeds of A to H in order of gear ratio, the four sets are constituted by a first set of A having a largest gear ratio and C that is next but one; a second set including at least H having a smallest gear ratio; a third set of B and D between two of the first set; and a fourth set including two of E, F and G between the second and third sets, and one of first and second pressure regulators selectively supplies hydraulic pressure to two of the mechanisms corresponding to the first and second sets, while the other thereof selectively supplies hydraulic pressure to two of the mechanisms corresponding to the third and fourth sets.