Compaction Vehicle Constant Speed Control via Feedback
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Solution Overview
Problem
Compaction vehicles face challenges in maintaining a constant speed during repeated forward and backward movements, as operators struggle to accurately adjust the speed adjustment lever, leading to difficulties in achieving consistent compaction density on road surfaces.
Innovation Solution
A compaction vehicle equipped with a displacement detection device, a calculation device, and a drive source controller, which uses a running speed setting switch and a control signal memory device to maintain a constant speed by outputting calculated signals to the drive source controller, ensuring the vehicle operates at a predetermined speed even during repeated forward and backward movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the forward/backward lever is manually adjusted to maintain constant speed, then the vehicle can be operated, but the operator cannot accurately stop the lever at the predetermined position repeatedly, causing speed variation
Solution Approach 1:
The patent employs feedback control by detecting the actual running speed with a speed detection device and comparing it with the target speed. The calculation device then adjusts the control signal to the drive source based on this comparison, creating a closed-loop system that automatically maintains constant speed without requiring manual intervention.
Solution Approach 2:
The system performs self-regulation of speed by automatically detecting speed deviations and adjusting the drive source accordingly. The calculation device and control system work autonomously to maintain the predetermined speed, eliminating the need for continuous manual lever adjustment by the operator.
2Adaptability or versatility
If the forward/backward lever is adjusted frequently for repeated movements, then the vehicle can change direction, but the operator finds it extremely difficult to maintain strict constant running speed
Solution Approach 1:
The feedback control system continuously monitors the actual speed during direction changes and repeated movements, comparing it with the target speed. The calculation device adjusts the control signal in real-time to compensate for speed variations caused by frequent lever adjustments, maintaining reliable speed consistency.
Solution Approach 2:
The patent replaces the manual mechanical lever adjustment system with an automated electronic control system. The calculation device and drive source controller substitute for the operator's manual operations, providing consistent and reliable speed control that is not affected by human fatigue or skill limitations.
3Device complexity
If manual lever operation is used, then the system is simple, but accurate and consistent speed maintenance requires extreme operator skill that is difficult to achieve
Solution Approach 1:
The control system performs self-regulation by automatically detecting speed and adjusting the drive source without operator intervention. This maintains the simplicity of the overall system while transferring the complexity of constant speed maintenance from the operator to the automated system, making operation easy for any user.
Solution Approach 2:
The calculation device acts as an intermediary between the speed detection device and the drive source controller. It processes the detected speed information and generates appropriate control signals, serving as a mediator that automatically manages the complex task of speed maintenance while keeping the operator's role simple.
Data Source
AI summary
The compaction vehicle having a speed adjustment member, a displacement detector, and a drive source controller further includes a calculation device between the displacement detector and the drive source controller, receiving the displacement S, and outputting a signal I calculated to the controller; a running speed setting switch for the operator operating ON at a desired running speed; a control signal memory device provided inside the calculation device and memorizing a signal I1 to the controller. In a normal operation, the calculation device outputs the signal I to the controller so that a running speed increases or decreases according to the displacement S, and when the switch is operated to ON, the calculation device maintains the ON state, and the displacement S is not less than a predetermined value, the calculation device outputs the signal I1 memorized in the memory device so as that the vehicle will run at a constant speed.