Automatic Transmission State Correction for Impact Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional automatic transmissions with planetary gear mechanisms and engagement mechanisms face issues where the actual state of the switching mechanism may not match the intended state, leading to potential large impacts and reduced responsiveness when the drive source is re-driven, due to unexpected changes in hydraulic pressure.
Innovation Solution
An automatic transmission system with a control part that recognizes the rotational frequency of the drive source and includes a switching control circuit with a state detector, ensuring the switching mechanism is switched to the correct state upon re-start, preventing forced switching during differential rotation and maintaining responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a hydraulic pressure control circuit is used as a switching control circuit, then the switching mechanism can be controlled to change state, but the driving of the oil pump stops when the drive source is stopped, causing unexpected changes in hydraulic pressure and the state of the switching control circuit becomes different from the state instructed by the control part
Solution Approach 1:
The patent applies feedback by having the control part detect the actual state of the switching control circuit and compare it with the instructed state. When a mismatch is detected after drive source stoppage, the control part sends a correction signal to realign the switching control circuit state with the instructed state, ensuring reliability through continuous state verification and correction.
Solution Approach 2:
The patent applies preliminary action by detecting the stoppage of the drive source and proactively checking the state of the switching control circuit before re-driving. If the state has deviated due to hydraulic pressure changes, the control part corrects it in advance, preventing potential conflicts during subsequent operation.
2Ease of operation
If the switching control circuit tries to switch the switching mechanism to the fixed state when the drive source is re-driven, then the gear position can be controlled, but a large impact may be applied to the components of the switching mechanism or the switching control circuit when differential rotation is occurring
Solution Approach 1:
The patent applies dynamics by making the switching control circuit adaptable to the actual operational state. Instead of rigidly enforcing a predetermined switching sequence, the control part dynamically adjusts the switching commands based on real-time detection of the switching mechanism's actual state, allowing smooth transitions without forcing switches during differential rotation.
Solution Approach 2:
The patent uses feedback to detect whether the switching mechanism is in a state that would cause conflict if switched. The control part receives state information from the switching control circuit and adjusts its switching commands accordingly, preventing large impacts by avoiding switches when differential rotation is detected.
3Device complexity
If the state of the switching mechanism does not match the state instructed by the control part, then the switching control can be simplified, but the responsiveness deteriorates when the drive source is re-driven
Solution Approach 1:
The patent applies feedback by implementing a state detection mechanism that monitors the actual state of the switching control circuit and reports it to the control part. This feedback loop enables the control part to quickly identify state mismatches after drive source stoppage and initiate corrective actions, maintaining responsiveness without significantly increasing overall system complexity.
Solution Approach 2:
The patent applies self-service by enabling the switching control circuit to maintain its state information and allow the control part to detect and correct mismatches autonomously. The system self-diagnoses state inconsistencies and self-corrects without requiring complex external intervention, balancing simplicity with responsiveness.
Data Source
AI summary
Provided is an automatic transmission with which a large impact is hardly applied to the component of the switching mechanism or the switching control circuit when the drive source is re-driven. When a drive source ENG is determined to be in the stopped state, if the position of a slider HC1 does not correspond to the position the control partECU instructed before the drive source ENG is determined to be in the stopped state, the control part ECU of the automatic transmission TM transmits a signal for switching a two-way clutch TW to a state corresponding to the state of a slider HC1.