Tractor Suspension Mode Switching for Pitch Control
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Solution Overview
Problem
Tractors equipped with suspension mechanisms experience pitching and reduced riding comfort when ground implements are raised during work, as the suspension mechanism's functioning is not effectively controlled to counteract the reaction forces from the implement's elevation.
Innovation Solution
A mode-switching mechanism that selectively activates or suppresses the suspension mechanism based on detected raise or lower control signals, ensuring the suspension function is maintained when the implement is not being raised, thereby preventing pitching and maintaining comfort during operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the suspension mechanism functions during ground implement elevation, then riding comfort is improved, but pitching of the vehicle body occurs due to reaction forces
Solution Approach 1:
The suspension mechanism dynamically switches between active and inactive states based on operational conditions. The control unit activates the suspension during normal travel and deactivates it during ground implement elevation, allowing the system to adapt its characteristics to different operational phases and resolve the contradiction between comfort and stability
Solution Approach 2:
The control unit receives feedback signals from the elevation/lowering control signals of the ground implement and accordingly controls the suspension mechanism's activation state. This feedback loop ensures the suspension is deactivated when implement elevation is detected, preventing pitching while maintaining comfort during normal operation
2Stability of the object's composition
If the suspension mechanism is deactivated during ground implement elevation, then pitching is suppressed, but riding comfort is degraded
Solution Approach 1:
The suspension mechanism transitions between active and inactive states based on operational conditions. During ground implement elevation, the suspension is deactivated to prevent pitching, while during normal travel, it is activated to provide riding comfort, thus dynamically resolving the contradiction
Solution Approach 2:
The suspension mechanism operates periodically - active during normal travel phases and inactive during implement elevation phases. This periodic activation/deactivation pattern allows the system to provide comfort when needed and prevent pitching when implement elevation occurs
3Ease of operation
If the suspension mechanism functions at high speed, then riding comfort is improved, but the system complexity increases
Solution Approach 1:
The control unit serves multiple functions: it monitors elevation/lowering control signals, determines operational phases (travel vs. work), and controls suspension activation/deactivation. This multi-functionality reduces the need for separate dedicated components, managing system complexity while providing high-speed suspension functionality
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
The mode-switching mechanism effectively suppresses pitching of the tractor's front part and enhances riding comfort by limiting or stopping suspension function during implement elevation, ensuring the suspension mechanism functions optimally when the implement is raised, thus maintaining good riding comfort during work.
Implementation Method 1
a hydraulic cylinder that extends and contracts in coordination with the vertical movement of the front wheels 1 and the front axle case 18
Data Source
AI summary
A tractor is provided for suppressing pitching in which a front part of a traveling vehicle body is lifted upward, while a suspension mechanism functions when work is carried out with a ground implement. When a raise control signal for raising the plow is detected in draft control for elevating/lowering the plow based on a draw load value detected by a draw load sensor, mode switching means suppresses or limits the suspension function, via control of the suspension control means to suppress an event in which the front part of the traveling vehicle body is lifted upward. When the raise control signal is not detected, the mode switching means causes the suspension mechanism to function via control of the suspension control means.