Manual Transmission Shift Sensing With Contactless Rod Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing shift signal transmitters in vehicles with manual transmissions, particularly motorcycles, are prone to wear and environmental influences due to mechanical contact, requiring separate switches for each switching direction and increasing the effort for gear changes.
Innovation Solution
A shift signal transmitter with a contactless inductive distance sensor and evaluation circuit, integrated within a housing, generates shift signals based on the axial movement of a shift rod, allowing for reduced mechanical wear and simplified gear changes by aligning engine and gearbox speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical switches are used in the force transmission path, then gear shift signaling can be achieved, but the switches are subject to wear and environmental influences
Solution Approach 1:
The patent replaces mechanical contact switches with a capacitive sensor system that detects shift rod position through electrical fields without physical contact. The shift rod itself serves as one electrode of the capacitor, eliminating mechanical wear and improving reliability in harsh environments.
Solution Approach 2:
The patent introduces a dielectric layer between the shift rod and the sensor electrode, creating a capacitive coupling that allows position detection without direct mechanical contact. This intermediary structure enables non-contact sensing while maintaining electrical isolation.
2Adaptability or versatility
If separate switches are used for each switching direction, then bidirectional control is achieved, but device complexity increases
Solution Approach 1:
The patent uses a single capacitive sensor system that can detect both upward and downward movement of the shift rod by monitoring changes in capacitance in either direction from a neutral position. This multi-functional approach eliminates the need for separate switches for each direction.
Solution Approach 2:
The patent combines multiple switching functions into a single capacitive sensor that detects bidirectional position changes. By merging the functionality of multiple switches into one sensor element, the system achieves bidirectional control with reduced complexity.
3Ease of operation
If the shift rod is separated to form a short idle stroke, then shift signal generation is enabled, but mechanical wear increases
Solution Approach 1:
The patent replaces mechanical switching mechanisms with a capacitive sensing system that detects the short idle stroke of the shift rod through electrical field changes. This substitution maintains the ease of operation for shift signal generation while eliminating mechanical wear.
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
The solution provides a reliable and low-maintenance shift signal transmission system that reduces shifting effort and minimizes mechanical wear, enabling smoother gear changes without the need for multiple switches, while maintaining accuracy and durability.
Implementation Method 1
The circuit board carries an electrically conductive conductor track, through which an inductive measuring field is generated
Data Source
AI summary
A shift signal transmitter for a manual transmission of a vehicle, in particular of a motorcycle, includes a shift rod for force-transmitting coupling to a foot lever, optionally with the interposition of an extension rod. The shift rod is guided along its longitudinal axis in an axially displaceable manner between two axial stops in an, in particular sleeve-shaped, housing. A connecting piece, which serves for coupling to a shift lever, is rigidly connected to the housing opposite to an internal axial end of the shift rod. A distance sensor for contact-free distance measurement is disposed within the housing opposite to the internal axial end of the shift rod and a sensor area of the distance sensor is oriented radially relative to the longitudinal axis. A shift apparatus for a manual transmission of a vehicle is also provided.