Vehicle Shifter Assembly Sensor Positioning
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Solution Overview
Problem
In shift-by-wire vehicle transmission systems, maintaining accurate detection of the shift lever position is challenging due to the movement of the magnet relative to the sensor, which can result in inconsistent distance and reduced sensing accuracy, often requiring more powerful magnets or sophisticated sensors to compensate.
Innovation Solution
A sensor element with a magnet and carrier is biased to maintain a consistent distance from the sensor, using a spring to keep the magnet engaged with a wall, ensuring a fixed distance and accurate position detection, and a follower mechanism provides tactile feedback and varying shift effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the magnet is allowed to move freely relative to the sensor during shift lever movement, then the mechanism is simpler and more flexible, but the sensing accuracy deteriorates due to inconsistent distance
Solution Approach 1:
A non-magnetic bridge component is introduced as an intermediary between the magnet and sensor. The bridge maintains a constant distance relationship, ensuring consistent magnetic field coupling while allowing the shift lever to move freely. This mediator resolves the contradiction by decoupling the motion freedom of the lever from the distance stability requirement between magnet and sensor.
Solution Approach 2:
The problem of maintaining constant distance in one dimension (the gap between magnet and sensor) is solved by moving to another dimension - the magnet is mounted on a movable carrier that can adjust its position along the pivot axis while the sensor remains fixed. This dimensional freedom allows the system to maintain optimal sensing distance regardless of shift lever position.
2Measurement precision
If a more powerful magnet or sophisticated sensor is used to compensate for distance variation, then sensing accuracy is maintained, but device complexity and cost increase
Solution Approach 1:
Instead of using complex electronic sensors or powerful magnets to compensate for distance variation, the invention uses a simple mechanical bridge structure made of non-magnetic material. This mechanical solution maintains constant distance through physical constraint rather than electronic compensation, achieving high sensing accuracy with simple, inexpensive components.
3Ease of manufacture
If the sensor element is fixed relative to the housing, then manufacturing is simpler, but tactile feedback and varying shift effort are reduced
Solution Approach 1:
The sensor element is mounted on a carrier that can move dynamically along with the shift lever's motion. This dynamic mounting allows the sensor to follow the lever's movement while maintaining constant distance, providing both manufacturing simplicity and improved tactile feedback as the sensor element moves with the housing.
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 enhances the accuracy of shift lever position detection and provides tactile feedback, reducing the need for more powerful magnets or advanced sensors, while maintaining a consistent distance between the sensor element and sensor, improving overall system reliability and user experience.
Implementation Method 1
The sensor element may include a magnet and the carrier retains the magnet relative to the housing
Implementation Method 2
A biasing member may yieldably bias at least one of the carrier or sensor element relative to the housing
Data Source
AI summary
A shift lever assembly may include a shift lever movable about a pivot axis to permit changing a transmission mode, and a sensor element coupled to the shift lever for movement with the shift lever when the shift lever is moved to cause a transmission mode change. The sensor element is movable relative to the shift lever during at least a portion of the movement of the shift lever. This may permit the sensor element to remain at a relatively consistent distance from the sensor, where that distance is measured perpendicular to the sensor, over the path of movement of the sensor element.