Parked PTO Control Using Seat Posture in Working Vehicles
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Solution Overview
Problem
Existing working vehicles with Power Take-Off (PTO) shafts lack advanced functionality for operators to perform tasks outside the vehicle body while the vehicle is parked, limiting convenience and efficiency.
Innovation Solution
A working vehicle configuration that includes a prime mover, speed controller, PTO shaft, posture switch, parking switch, and actuators to maintain or stop the prime mover's driving based on seat posture and parking status, allowing PTO shaft operation while the vehicle is parked, with additional switches for speed control and PTO shaft management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PTO shaft is driven only when the vehicle is in motion, then safety is improved, but operational flexibility deteriorates
Solution Approach 1:
The patent applies dynamics by making the PTO shaft driving condition adaptive rather than static. The control unit dynamically adjusts the PTO shaft operation based on real-time detection of seat posture (via posture detection unit) and vehicle motion state (via motion state detection unit), allowing the system to transition between different operational modes (allowed/driven/forbidden/stopped) according to actual working conditions, thus resolving the contradiction between safety and operational flexibility.
2Adaptability or versatility
If the PTO shaft can be driven while parked, then operational flexibility is improved, but safety deteriorates
Solution Approach 1:
The patent implements feedback control through the control unit that continuously monitors seat posture and vehicle motion state, and adjusts PTO shaft operation accordingly. The posture detection unit and motion state detection unit provide real-time feedback to the control unit, which then determines whether to allow or forbid PTO shaft driving based on the combination of these inputs, ensuring safety while enabling operational flexibility when conditions are appropriate.
3Adaptability or versatility
If multiple detection units and actuators are added to control PTO shaft operation, then operational flexibility is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the control unit to perform multiple functions: it processes signals from the posture detection unit, signals from the motion state detection unit, and the on-off switch, and generates appropriate control signals for the first actuator and second actuator. This multi-functional control unit consolidates the complexity into a single intelligent component rather than requiring separate control mechanisms for each function, thereby enabling operational flexibility while managing device complexity.
Data Source
AI summary
A working vehicle includes a prime mover, a driver's seat selectively set in either a first posture where a driver can sit thereon or a second posture where the driver cannot sit thereon, a speed controller to receive power from the prime mover and perform a speed-changing of the power, a PTO shaft to receive the speed-changed power from the speed controller, a posture switch to detect whether the driver's seat is set in the first or second posture, a parking switch to detect parking of a vehicle body, and a first actuator. During driving of the prime mover, the first actuator maintains the driving of the prime mover when both the parking and the driver's seat set in the second posture are detected, and stops the driving of the prime mover when neither the parking nor the driver's seat set in the second posture is detected.