One-Hand Forward Reverse Control for Work Vehicles
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Solution Overview
Problem
Conventional work vehicles operating under a reverse facing posture require complex and distinct forward/reverse operations, often involving multiple switches that are not intuitively sequential, leading to potential erroneous vehicle movements.
Innovation Solution
A one-hand control type forward/reverse operational unit with a push button and pivot lever, where the push button is operated first to initiate a signal, followed by sequential operation of the pivot lever to control vehicle direction, ensuring clear intent recognition and preventing unintended movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple independent switches are provided for forward/reverse operations under reverse facing posture, then the vehicle can respond to driver inputs, but the operation becomes complex and error-prone
Solution Approach 1:
The patent combines multiple independent switches into a single integrated operational unit with sequential operation. The first operational tool (push button) and second operational tool (pivot lever) are merged into one control assembly that must be operated in sequence, reducing the number of separate controls while maintaining reliable signal input for forward/reverse operations.
Solution Approach 2:
The patent implements preliminary action by requiring the driver to first operate the push button to initiate the operation mode, and only then can the pivot lever be operated to select direction. This sequential requirement ensures the driver's intent is clearly established before vehicle movement is commanded, improving both reliability and operational clarity.
2Adaptability or versatility
If two switches are provided for forward and reverse operations, then directional control is achieved, but the operational procedure becomes complex requiring time-sequence operations
Solution Approach 1:
The patent segments the directional control function into two distinct operational tools within one integrated unit: a push button for initiating operation mode and a pivot lever for selecting direction. This segmentation allows each tool to have a specific, simple function while together they provide complete directional control capability.
Solution Approach 2:
The push button serves as a preliminary action that must be operated first to enable subsequent direction selection via the pivot lever. This preliminary step simplifies the overall control structure by creating a clear operational hierarchy, reducing complexity compared to having two independent switches operated simultaneously.
3Ease of operation
If independent switches are spaced apart for forward and reverse operations, then each switch can be independently actuated, but the driver's intent recognition becomes ambiguous
Solution Approach 1:
The patent merges the forward and reverse control functions into a single operational unit where both tools must be operated in sequence. This combination ensures that the driver's intent is clearly communicated through a defined operational procedure, eliminating ambiguity that arises from spaced-apart independent switches.
Solution Approach 2:
The sequential operation requirement provides feedback to the driver about their intent. The system only responds to direction selection (pivot lever) after confirming operation mode activation (push button), creating a feedback loop that ensures clear intent recognition and reduces the risk of erroneous operations.
Data Source
AI summary
Disclosed is a work vehicle adapted to mount a front work implement operated under a forward facing posture and a rear work implement operated under a reverse facing posture. A forward/reverse operational unit includes a first operational tool operable by one hand of a driver under the reverse facing posture and a second operational tool operable by the one hand engaged in operation of the first operational tool. A traveling control unit includes a signal inputting section configured to input a first operational signal outputted from the one-hand control type forward/reverse operational unit in response to an operation on the first operational tool and a second operational signal outputted from the one-hand control type forward/reverse operational unit in response to an operation on the second operational tool, and a signal evaluating section configured to output a traveling command for causing a vehicle body to travel forwardly or reversely, based on the first operational signal and the second operational signal.