Gearbox Shift Lockout Using Rotation Sensing
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Solution Overview
Problem
Disengaging or engaging gearing components during active operations in mechanical gearboxes can lead to damage or failure, and hydrostatic clutches, while addressing this, incur additional cost and complexity.
Innovation Solution
A system comprising a rotation sensor, shift solenoid, and microcontroller that prevents shifting between gear ratios by detecting gearbox operation, using a Hall effect sensor to inhibit solenoid activation when the gearbox is in use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hydrostatic clutches are used to enable shifting during operations, then shifting capability is improved, but device complexity and cost increase substantially
Solution Approach 1:
The patent replaces the mechanical hydrostatic clutch system with an electronic control system consisting of a microcontroller, rotation sensor, and solenoid. This substitution eliminates the need for complex hydrostatic mechanisms while achieving the same functional goal of preventing shifts during rotation, thereby reducing device complexity and cost.
Solution Approach 2:
The patent introduces a microcontroller as an intermediary between the rotation sensor and solenoid. This intermediary processes sensor data and controls the solenoid accordingly, enabling intelligent decision-making about when to allow or prevent shifting without requiring complex mechanical mechanisms like hydrostatic clutches.
2Reliability
If shifting is prevented during rotation using sensors and microcontrollers, then component reliability is improved, but device complexity increases
Solution Approach 1:
The system employs a rotation sensor that automatically detects gearbox rotation and provides feedback to the microcontroller. This self-service mechanism eliminates the need for external monitoring or manual intervention, allowing the system to autonomously prevent shifts during rotation and thereby improve reliability without requiring complex external control systems.
Solution Approach 2:
The patent implements a feedback loop where the rotation sensor continuously monitors gearbox rotation status and communicates this information to the microcontroller. The microcontroller uses this feedback to make real-time decisions about solenoid activation, ensuring shifts are prevented only when necessary (during rotation) while allowing shifts when safe (when stationary), thus improving reliability with minimal added complexity.
3Reliability
If a rotation sensor and microcontroller system is implemented, then shifting during operation is prevented, but device complexity increases
Solution Approach 1:
The patent uses relatively simple, inexpensive components such as a basic rotation sensor, microcontroller, and solenoid instead of expensive, complex hydrostatic clutch systems. These simpler components achieve the same protective function at lower cost and with less complexity, making the overall system more economical and easier to maintain.
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
Prevents gearbox shifting during operation, thereby reducing component damage and eliminating the need for costly hydrostatic clutches.
Implementation Method 1
the rotation sensor comprises a Hall effect sensor
Data Source
AI summary
A system for preventing shifting between a plurality of gear ratios in a mechanical gearset. An operating sensor detecting rotation of a moving component in the mechanical gearset, a shift solenoid controlling shifting among the plurality of gear ratios, and a microcontroller communicatively coupled to the shift solenoid and the operating sensor that prevents activation of the shift solenoid when rotation is detected by the rotation sensor.