Range Switchover Motor Control for Detent Restraint Handling
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Solution Overview
Problem
Existing range switchover apparatuses for vehicles face challenges in initial driving operations due to the restraint caused by the shape of the detent mechanism, leading to excessive loading and potential durability issues and unintentional range skipping.
Innovation Solution
The apparatus includes a control unit that performs initial learning processing by rotating the motor in a predetermined direction corresponding to the restraint caused by the detent mechanism, ensuring the detent mechanism holds the range switchover mechanism at a predetermined position, thereby preventing excessive loading and ensuring accurate range switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If initial learning processing is performed by rotating the motor in any direction, then the encoder count value and power supply phase can be matched, but the motor may be driven against the restraint caused by the detent mechanism shape, causing excessive loading and durability issues
Solution Approach 1:
The control unit determines the rotation direction before performing initial learning processing, specifically selecting a direction that avoids driving against the detent mechanism's restraint. This preliminary determination ensures that the motor rotates in a direction that prevents excessive loading on the detent mechanism while still achieving encoder count value and power supply phase matching.
Solution Approach 2:
The invention changes the rotation direction parameter of the motor during initial learning processing based on the detent mechanism's restraint characteristics. By selecting an appropriate rotation direction (e.g., clockwise or counter-clockwise) according to the detent mechanism shape, the system achieves phase matching without causing harmful excessive loading.
2Productivity
If the motor is driven against the restraint caused by the detent mechanism shape, then initial learning processing can be completed, but excessive loading occurs on the detent mechanism and range switchover mechanism
Solution Approach 1:
Before executing initial learning processing, the control unit determines the appropriate rotation direction that avoids driving against the detent mechanism's restraint. This preliminary action ensures that the motor rotates in a direction that completes the learning processing without causing excessive loading on the detent mechanism or range switchover mechanism.
Solution Approach 2:
The control unit applies preliminary anti-action by selecting a rotation direction that counteracts the potential harmful effect of driving against the detent mechanism restraint. By choosing the opposite or appropriate rotation direction, the system prevents excessive loading while still achieving the necessary initial learning processing.
3Speed
If the motor is driven against the detent mechanism restraint, then rotation can occur, but unintentional range skipping may occur
Solution Approach 1:
The control unit determines the rotation direction before initiating motor rotation during initial learning processing. By selecting a direction that avoids driving against the detent mechanism restraint, the system ensures smooth motor rotation without causing unintentional range skipping, thus maintaining range switching accuracy.
Solution Approach 2:
The invention changes the rotation direction parameter based on the detent mechanism's characteristics to prevent unintentional range skipping. By selecting an appropriate rotation direction that aligns with the detent mechanism's restraint shape, the system achieves reliable range switching while completing initial learning processing.
Data Source
AI summary
When electric power supply is started, an initial driving operation is performed to switch over a power supply phase of a motor in open-loop control. Initial learning processing is performed to learn a phase deviation correction value for the power supply phase relative to a count value of a pulse signal of an encoder. As a restraint caused by a shape of a detent mechanism, the motor need be rotationally driven so that a detent lever does not move in a negative direction beyond a bottom position of a P-range in the initial driving operation. In a case of performing the initial learning processing in the P-range in consideration of this restraint, the initial learning processing is performed by setting a rotation direction of the motor.