PTO Gear Switching Control for Constant Shaft Speed
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Solution Overview
Problem
Existing working vehicles lack the ability to perform transmission operations of the PTO-based power transmitting system through electronic control using a switch.
Innovation Solution
A working vehicle equipped with a synchromesh switching mechanism that switches power transmission between a first and second gear train via electronic control using a shift fork, operation mechanism, and a controller, allowing for automatic mode switching based on the prime mover's rotation speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If manual switching mechanism is used for PTO power transmission, then structural simplicity is maintained, but automation level and operational convenience deteriorate
Solution Approach 1:
The patent replaces the manual mechanical switching mechanism with an electronic control system. The controller receives signals from operation switches and automatically controls the synchromesh switching mechanism via solenoid valves and hydraulic actuators, eliminating the need for manual intervention while maintaining mechanical reliability.
Solution Approach 2:
The patent introduces an electronic control unit as an intermediary between the operator and the mechanical switching system. The controller processes operator inputs and coordinates the switching operations through intermediate components like solenoid valves and hydraulic pressure, enabling automated control without direct mechanical manipulation.
2Stability of the object's composition
If gear trains are switched based on engine rotation speed to maintain consistent PTO shaft speed, then PTO shaft rotation speed stability is improved, but transmission system complexity increases
Solution Approach 1:
The patent implements a dynamic transmission system that automatically adapts to changing engine rotation speeds. The controller monitors engine speed and dynamically switches between first and second gear trains to maintain constant PTO shaft output speed, transforming a static mechanical system into a dynamically responsive one.
Solution Approach 2:
The patent incorporates a feedback control mechanism where the controller continuously monitors engine rotation speed and adjusts the gear train selection accordingly. This closed-loop control ensures that the PTO shaft maintains stable rotation speed by using information about actual engine performance to make real-time transmission adjustments.
3Ease of operation
If electronic control system is implemented for PTO transmission switching, then operational convenience and automation are improved, but system complexity and control difficulty increase
Solution Approach 1:
The patent enables the transmission system to self-regulate by automatically selecting appropriate gear trains based on engine rotation speed without requiring operator expertise. The controller autonomously processes sensor data and executes switching decisions, making the system self-sufficient and easy to operate.
Solution Approach 2:
The patent creates a universal control system that handles multiple functions: monitoring engine speed, determining optimal gear train selection, controlling hydraulic actuators, and maintaining PTO shaft speed stability. This multi-functional controller simplifies the operator's task while consolidating complex control functions into a single integrated system.
Data Source
AI summary
A working vehicle includes a PTO shaft to extract power of a prime mover to an outside, a first PTO transmission shaft to receive power from the prime mover, a second PTO transmission shaft to transmit power to the PTO shaft, a first gear train and a second gear train to transmit power from the first PTO transmission shaft to the second PTO transmission shaft, and a synchromesh switching mechanism to switch power transmission from the first PTO transmission shaft to the second PTO transmission shaft between a first mode where the power transmission is performed via the first gear train and a second mode where the power transmission is performed via the second gear train.