Vehicle Shift Position Learning Without Collision Wear
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Solution Overview
Problem
Existing shift devices for vehicles face challenges in maintaining the durability of the transmission mechanism and positioning accuracy due to the need for intentional collisions during the learning process, which applies excessive load and reduces durability.
Innovation Solution
A shift device that includes a shift switching member, a positioning member, a motor, a rotor rotation angle sensor, and an output shaft rotation angle sensor, which allows the detection of valley bottoms in the shift switching member without collision by reversing the movement of the positioning member based on sensor outputs and design values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the roller at the tip of the detent spring is intentionally brought into contact with the wall portion during learning, then the positioning accuracy of the roller with respect to the detent plate is improved, but the durability of the transmission mechanism is decreased due to excessive load and collision
Solution Approach 1:
The system performs learning operations in advance to acquire the relationship between motor rotation angles and valley bottom positions. By pre-acquiring this positioning information during manufacturing or initial setup, the system eliminates the need for repeated collision-based learning during normal operation, thereby preserving transmission mechanism durability while maintaining positioning accuracy
Solution Approach 2:
The invention replaces the mechanical collision-based learning method with an electronic control system that uses rotation angle sensors to detect valley bottom positions. Instead of physically pressing the roller against the wall portion, the system uses sensor feedback to identify positioning points, substituting mechanical force with electronic detection and control
2Loss of information
If the roller is pressed against the wall portion to acquire the wall portion position, then the positioning information is obtained, but a load is applied to the transmission mechanism which decreases its durability
Solution Approach 1:
The system replaces mechanical pressing with electronic detection using rotation angle sensors. The sensors detect changes in rotation angle that correspond to valley bottom positions, allowing the system to acquire positioning information without applying mechanical load to the transmission mechanism
Solution Approach 2:
The system uses feedback from rotation angle sensors to detect when the roller reaches valley bottom positions. By monitoring the relationship between motor rotation angle and output shaft rotation angle, the system can identify positioning points through sensor feedback rather than mechanical contact, eliminating the need for forceful pressing operations
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 solution enables the shift device to learn the position of valley bottoms without causing collisions, thereby reducing the wear on the transmission mechanism and maintaining high positioning accuracy.
Implementation Method 1
a rotor rotation angle sensor configured to detect a rotation angle of the rotor
Implementation Method 2
an output shaft rotation angle sensor configured to detect a rotation angle of the shift switching member
Implementation Method 3
a motor configured to drive the shift switching member and including a rotor and a stator
Data Source
AI summary
A shift device includes a shift switching member including a plurality of valley portions; a positioning member configured to establish a shift position; a motor configured to drive the shift switching member; a rotor rotation angle sensor; and an output shaft rotation angle sensor configured to detect a rotation angle of the shift switching member. When the positioning member is moved to pass through the plurality of valley portions, the rotation angle of the motor corresponding to the valley bottom of each of the plurality of valley portions is acquired by, based on output values of the rotor rotation angle sensor and the output shaft rotation angle sensor, and a design value associated with the output value of the output shaft rotation angle sensor and the shift positions, detecting the valley bottom at an end portion among the valley portions and reversing the movement of the positioning member.