Shifting Actuator Position Detection for Reliable Vehicle Transmission
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Solution Overview
Problem
Existing transmission-equipped vehicles face issues with improper mounting of shifting power transmission mechanisms during maintenance, leading to failed shifting processes due to displacement of the shifting actuator's non-shifting position over time.
Innovation Solution
A transmission-equipped vehicle configuration that includes a manual shifting power transmission mechanism, an automatic shifting power transmission mechanism with a unidirectional transmitting part, and a controller that detects and adjusts the non-shifting position of the shifting actuator to prevent mechanical resistance and ensure proper shifting, using a first detection procedure to determine the center position of engagement members and compare it to predetermined ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the automatic shifting power transmission mechanism is used to perform shifting processes, then the shifting process can be automated, but the non-shifting position of the shifting actuator may be displaced due to improper mounting or time-related changes, leading to shifting process failure
Solution Approach 1:
The controller executes a detection procedure during a non-shifting period to detect the center position of the first engagement portion on the relative motion path before automatic shifting operations begin. This preliminary detection ensures the shifting actuator is properly positioned, preventing shifting process failures due to displaced non-shifting positions.
Solution Approach 2:
The controller detects the center position of the first engagement portion and compares it to the original position to determine if the non-shifting position is appropriate. This feedback mechanism allows the system to identify and correct positional displacements, ensuring reliable automatic shifting operations.
2Ease of operation
If the manual shifting power transmission mechanism is connected directly to the shifting actuator, then the shifting operation can be performed, but the shifting actuator may cause mechanical resistance during manual shifting operations
Solution Approach 1:
The unidirectional transmitting part extracts or isolates the shifting actuator from the manual shifting power transmission mechanism during manual shifting operations. By cutting off the connection, the shifting actuator cannot generate mechanical resistance, allowing smooth manual shifting operations.
Solution Approach 2:
Instead of allowing bidirectional power transmission between the manual shifting mechanism and the shifting actuator, the system uses unidirectional transmission that allows power flow in only one direction (from the shifting actuator to the transmission). This inversion of the power flow direction prevents the shifting actuator from resisting manual operations.
3Ease of manufacture
If the shifting actuator is mounted improperly during maintenance work, then the mounting process is simplified and faster, but the non-shifting position becomes displaced, causing shifting process failure
Solution Approach 1:
The system performs self-verification by detecting the center position of the first engagement portion and comparing it to the original position. This self-service capability allows the system to automatically identify improper mounting without requiring complex external alignment tools or procedures, maintaining ease of mounting while ensuring precision.
Data Source
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AI summary
In a first detection procedure, a controller drives a shifting actuator to move a first engagement member from an original position of a first engagement portion in one direction along a relative motion path and acquires first position information representing a first position, the original position corresponding to a non-shifting position of the shifting actuator, the first position being a position where the first engagement portion moved in the one direction contacts a second engagement portion. The controller drives the shifting actuator to move the first engagement member from the original position in the other direction along the relative motion path and acquires second position information representing a second position where the first engagement portion moved in the other direction contacts the second engagement portion. The controller calculates a center position of the first engagement portion on the relative motion path from the acquired first position information and the acquired second position information, compares the calculated center position to the original position, and determines whether the original position is within a predetermined first range defined based on the center position.