Electric Work Vehicle Lever Control for Shift and Reverse Switching
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Solution Overview
Problem
Conventional electric work vehicles require additional operation tools to change the direction of rotation of an electric motor, complicating the operation process.
Innovation Solution
An electric work vehicle design featuring a single operation part, such as a lever, that allows operators to change both the shift level and direction of rotation of the electric motor, eliminating the need for an additional operation tool by using a controller to output control signals based on manual operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional operation tool is used to control an electric motor, then the transmission shift level can be changed, but an additional operation tool is necessary for changing the direction of rotation of the electric motor
Solution Approach 1:
The patent combines the functions of transmission shift control and rotation direction control into a single operation tool (lever). The lever can be operated in multiple directions: front-back movement controls transmission shift levels, while left-right movement controls the rotation direction of the electric motor. This merging of functions eliminates the need for separate operation tools for each function.
Solution Approach 2:
The single operation tool (lever) is designed to perform multiple functions: it controls both the transmission shift level and the rotation direction of the electric motor. By making the operation tool universal, the patent reduces the total number of operation tools required while maintaining full control capability over the vehicle's propulsion system.
2Reliability
If multiple operation tools are used for controlling transmission and motor direction, then each function can be controlled precisely, but the operator burden increases
Solution Approach 1:
The patent merges transmission control and direction control into a single lever operation system. The lever's multi-directional movement capability allows precise control of both transmission shift levels (front-back movement) and rotation direction (left-right movement) without requiring the operator to manage multiple separate tools, thereby reducing operator burden while maintaining control precision.
3Device complexity
If a single operation part is used for both transmission and direction control, then the number of operation tools is reduced, but the risk of unintentional switching increases
Solution Approach 1:
The patent segments the control functions into distinct movement directions of the single lever: front-back movement for transmission control and left-right movement for direction control. This spatial segmentation of control functions within a single tool helps prevent unintentional switching by requiring deliberate movement in specific directions, thereby maintaining reliability while using a simplified operation system.
Solution Approach 2:
The patent adds dimensional complexity to a single operation tool by enabling movement in multiple directions (front-back and left-right). This multi-dimensional operation capability allows the single lever to perform multiple functions while reducing the risk of unintentional switching, as each function corresponds to a specific directional movement that is less likely to occur accidentally.
Data Source
AI summary
An electric work vehicle includes an electric motor, a travel device configured to travel on a ground based on a drive of the electric motor, a transmission configured to transmit a motive power from the electric motor to the travel device while varying a speed of a rotation inputted from the electric motor, a single operation part configured to accept a manual operation for changing a direction of the rotation of the electric motor and for changing a shift level of the transmission, and a controller configured to output a control signal to the electric motor and the transmission based on the manual operation accepted by the single operation part.