Work Vehicle Pedal Hold Linkage for Hands-Free Speed Control
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Solution Overview
Problem
Existing work vehicles require constant driver input to maintain a desired travel speed, lacking ease in speed control and operation efficiency.
Innovation Solution
A work vehicle configuration with an output pedal, biasing member, brake pedal, holding section, and linkage mechanisms to allow easy speed control and maintenance, enabling the vehicle to hold a desired speed without continuous driver input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the driver continuously depresses the accelerator pedal to maintain desired speed, then the travel speed can be maintained, but the ease of operation deteriorates due to constant driver input required
Solution Approach 1:
The system enables itself to maintain the desired speed by using the holding section to lock the accelerator pedal at the set position. Once the driver sets the desired speed by depressing the accelerator pedal and engages the holding section, the system maintains that speed automatically without requiring continuous driver input, thus resolving the contradiction between maintaining speed and ease of operation
Solution Approach 2:
The driver performs a preliminary action by depressing the accelerator pedal to the desired position and engaging the holding section before releasing the pedal. This preliminary setup allows the system to maintain the desired speed automatically, eliminating the need for continuous driver input and improving ease of operation while maintaining the desired travel speed
2Ease of operation
If the holding section is engaged to maintain accelerator pedal position, then the ease of operation improves, but the device complexity increases due to additional holding and release mechanisms
Solution Approach 1:
The brake pedal serves multiple functions: it operates the travel brake and simultaneously releases the holding section from the accelerator pedal through the brake linkage section. This multi-functionality reduces the need for separate release mechanisms, thereby improving ease of operation while minimizing the increase in device complexity
Solution Approach 2:
The function of releasing the holding section is merged with the brake operation. When the driver depresses the brake pedal, it not only applies the travel brake but also automatically releases the holding section through the brake linkage section, combining two functions into one operation and reducing overall system complexity
3Ease of operation
If the brake pedal is used to release the holding section, then the ease of operation improves for speed reduction, but the device complexity increases due to brake linkage section
Solution Approach 1:
The brake pedal is designed with multi-functionality: it operates the travel brake through the travel brake and simultaneously releases the holding section via the brake linkage section. This integration improves ease of operation for speed reduction while the shared functionality minimizes the actual increase in device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates easy maintenance of desired travel speed and efficient speed adjustment, improving operational ease and reducing the need for constant driver intervention.
Implementation Method 1
a biasing member (26) that biases the accelerator pedal (21) to return
Data Source
AI summary
A work vehicle includes an output pedal that controls the output of a motive section, a biasing member that biases the output pedal to return, and a brake pedal that operates a travel brake to a braking state. Also included are a holding section operable to a holding state of holding the output pedal at any depressed position and to a release state of releasing the holding of the output pedal, and a manual operating tool for manually operating the holding section to the holding state. Further included are a brake linkage section that operates the holding section to the release state when the brake pedal is depressed in the holding state, and an output linkage section that operates the holding section to the release state when the output pedal is depressed in the holding state.