Drive Axle Gear Detection Using Rotary Angle Encoder
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Solution Overview
Problem
Existing drive axles in agricultural vehicles, such as forage harvesters and combine harvesters, face challenges in gear detection and fault diagnosis due to the complexity and susceptibility to faults of multiple electrical components in manual transmissions, making error identification and maintenance difficult.
Innovation Solution
A drive axle with a simplified gear detection system using a rotary angle sensor kinematically coupled to the actuating element via mechanical guide means, which generates an angle signal indicating the selected gear level, reducing the number of electrical components and allowing detection of multiple positions with a single sensor, thus simplifying fault diagnosis and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple pushrod switches are used to detect gear positions, then gear recognition capability is improved, but device complexity and susceptibility to faults increase
Solution Approach 1:
Multiple pushrod switches are merged into a single rotary angle encoder that detects the position of a single actuating element. The encoder integrates the functionality of multiple switches by measuring the cumulative rotational angle, thereby reducing the number of electrical components while maintaining gear recognition capability.
Solution Approach 2:
The rotary angle encoder serves multiple functions: it detects the position of the actuating element, determines the selected gear stage, and provides a unified signal for all gear positions. This multi-functional component replaces multiple specialized switches, reducing system complexity.
2Measurement precision
If multiple pushrod switches with wiring are installed, then gear position detection is improved, but ease of repair and fault diagnosis deteriorate
Solution Approach 1:
The complex wiring system associated with multiple switches is extracted and replaced by a single encoder output. This eliminates the need for multiple wiring connections, making fault diagnosis simpler as there is only one sensor to check rather than multiple switches and their associated wiring.
Solution Approach 2:
The rotary angle encoder acts as an intermediary that converts the mechanical position of the actuating element into an electrical signal. This single intermediary component simplifies the system architecture, making it easier to diagnose faults compared to multiple direct switch-wiring connections.
3Device complexity
If a single rotary encoder is used with mechanical guide means, then device complexity is reduced, but measurement precision must be maintained
Solution Approach 1:
The mechanical guide means translate the linear or angular movement of the actuating element into rotational movement of the encoder shaft. This mechanical transformation ensures that a single rotary encoder can accurately track the position throughout the entire range of motion, maintaining measurement precision while reducing component count.
Solution Approach 2:
The mechanical guide means change the parameter of motion from linear/displaced movement to rotational movement, which is the native measurement parameter of the rotary encoder. This parameter transformation allows the encoder to accurately detect all actuator positions with a single component.
Data Source
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Figure 3~4
AI summary
A drive axle for a vehicle, in particular for an agricultural harvesting machine, with an integrated gearbox (2) which can be shifted into several gear stages (N, G1, Gn) by means of at least one movable actuating element (3, 4) and with a sensor arrangement for detecting the engaged gear stage (N, G1, Gn) is characterized in that the sensor arrangement has a rotary angle encoder which is kinematically coupled to the at least one actuating element (3, 4) via mechanical guide means (7, 8, 9, 21) in order to generate an angle signal (S) depending on the position of the at least one actuating element (3, 4) which indicates the engaged gear stage (N, G1, Gn) of the gearbox (2).