Work Vehicle Display System for PTO Speed Selection
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Solution Overview
Problem
Existing display systems for tractors with Power Take Off (PTO) modes face difficulties in accurately reading both engine and PTO rotation speeds due to small display areas for PTO rotation speed, making it hard to distinguish and read accurately.
Innovation Solution
A display system that allows selective display of either engine or PTO rotation speed in the same area, using a display selection switch, discrimination display section, and display control section to provide clear and easily visible readings, eliminating the need for dedicated PTO rotation speed sensors by calculating PTO speed based on engine speed data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If both engine rotation speed and PTO rotation speed are displayed on concentric arcs, then both speeds can be read out simultaneously, but the display area of the inner scale becomes small making accurate reading difficult
Solution Approach 1:
The display is segmented into two separate display areas: a first display area for engine rotation speed and a second display area for PTO rotation speed. This segmentation allows each rotation speed to be displayed in its own dedicated space, eliminating the problem of one scale occupying the display area of another while still providing simultaneous visibility of both parameters.
2Measurement precision
If a dedicated PTO rotation speed sensor is installed, then accurate PTO rotation speed detection is achieved, but device complexity and cost increase
Solution Approach 1:
The control unit acts as an intermediary that calculates PTO rotation speed based on engine rotation speed data and transmission ratio information. Instead of directly measuring PTO rotation speed with a dedicated sensor, the system uses the engine rotation speed sensor data combined with calculation algorithms to derive the PTO rotation speed, thereby avoiding the need for additional hardware sensors.
Solution Approach 2:
The system creates a calculated copy of the PTO rotation speed value based on engine rotation speed measurements and transmission characteristics. This calculated value serves as a proxy for direct measurement, providing sufficient accuracy for display purposes without requiring physical duplication of sensing hardware.
Data Source
AI summary
A display system for a work vehicle includes a rotation speed display section for selectively displaying an engine rotation speed or a PTO rotation speed in a same display area, a display selection switch for outputting a display selection command, a discrimination display section for displaying a discrimination object for discriminating which of the engine rotation speed and the PTO rotation speed is being displayed and a display control section for selectively providing an engine rotation speed display signal or a PTO rotation speed display signal to the rotation speed display section based on the display selection command and providing the discrimination display section with a display signal for the discrimination object based on the display selection command.