PTO Transmission System with CVT Speed Adaptation
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Solution Overview
Problem
Current PTO transmission systems in agricultural or industrial vehicles are inefficient in power consumption and not adaptable to different implements and working conditions, as they rely on high-energy auxiliary drives and fixed drive shaft speeds.
Innovation Solution
A PTO transmission system with a planetary drive unit, control means, and sensors to adjust engine rpm, transmission ratio, and drive motor speed, allowing for adaptable PTO output shaft speed based on target speed settings, optimized through operator-selectable modes and GPS/ISOBUS inputs for improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If auxiliary drive motors are used to control PTO shaft speed independently, then PTO speed adaptability is improved, but energy consumption increases
Solution Approach 1:
The patent merges the PTO drive function with the existing CVT transmission system by using the CVT's variable ratio capability to control PTO shaft speed. Instead of adding separate auxiliary drive motors, the system integrates PTO speed control into the main transmission pathway, allowing the PTO shaft to be driven directly through the CVT from the engine, thereby eliminating the need for additional high-energy auxiliary drives while maintaining speed adaptability.
Solution Approach 2:
The CVT transmission system is designed to serve multiple functions: it simultaneously controls both the vehicle wheel speed and the PTO shaft speed through its variable transmission ratio. By making the transmission system universal, the patent eliminates the need for separate dedicated auxiliary drive motors for PTO applications, reducing overall energy consumption while maintaining the ability to independently control PTO speed according to different implement requirements.
2Adaptability or versatility
If fixed drive shaft speed is used, then system simplicity is maintained, but adaptability to different implements deteriorates
Solution Approach 1:
The patent implements dynamic speed control for the PTO shaft by utilizing the CVT's continuously variable transmission ratio capability. The system can dynamically adjust the PTO shaft speed according to the specific requirements of different implements and working conditions, transitioning from a fixed speed system to a dynamically adjustable one. This is achieved through electronic control that modulates the CVT ratio based on sensor feedback and operator inputs, providing adaptability without requiring complex mechanical switching mechanisms.
Solution Approach 2:
The system incorporates sensor means to detect wheel speed and PTO shaft speed, feeding this information back to the control unit. This feedback mechanism allows the control system to automatically adjust the transmission ratio to achieve the desired PTO speed, enabling adaptability to different implements through electronic control rather than complex mechanical adjustments, thus managing system complexity through intelligent control.
3Productivity
If operator-selectable modes and GPS/ISOBUS inputs are added, then working efficiency is optimized, but device complexity increases
Solution Approach 1:
The control system is designed to automatically determine and adjust optimal working parameters based on GPS location data and ISOBUS implement inputs without requiring constant operator intervention. The system can autonomously select appropriate transmission ratios and PTO speeds based on pre-programmed work area data, allowing the machinery to serve itself in optimizing performance while reducing the cognitive burden on the operator. This self-service capability improves working efficiency while managing complexity through automated decision-making algorithms.
Data Source
AI summary
A PTO transmission system in a vehicle for transmitting power to a PTO shaft driving an implement comprises a planetary drive unit having first and second input and output coupled to the PTO shaft. The first and second inputs are coupled to an output shaft of the vehicle engine and to an output shaft of a drive motor, respectively. A control system controls the transfer of power from a power source to the drive motor. The power source is a variable power generating source driven by the PTO shaft. The drive motor is configured and adapted to decrease or increase the rotational speed of the output of the planetary drive unit on an increase or decrease of the power transferred to it, respectively.