Articulation Control System with Dual Independent Damping Units
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Solution Overview
Problem
Articulated vehicles face challenges in maintaining stable operation due to the risk of vehicle instability and jack-knifing, particularly in slippery conditions and high-speed turns, as existing damping systems are prone to faults and fail to provide adequate damping control.
Innovation Solution
The articulation control system employs two separate damping means with independent control units, allowing one unit to maintain control if the other malfunctions, using hydraulic damping cylinders and proportional valves to adjust damping based on driving conditions, and includes an emergency damping valve for continued operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single control unit is used to control the damping mechanism, then the device complexity is reduced, but the reliability decreases because the system cannot operate if the control unit malfunctions
Solution Approach 1:
The control system is segmented into two separate control units (31, 32), each independently controlling one damping cylinder (23, 24). This segmentation ensures that if one control unit fails, the other can continue to operate, maintaining system reliability while keeping each individual control unit relatively simple
Solution Approach 2:
Each control unit is assigned to control a specific damping cylinder locally, rather than having a single centralized control unit manage both. This local control approach distributes the control function, improving reliability without significantly increasing overall system complexity
2Ease of operation
If the articulation joint is allowed to rotate freely with minimal damping, then the ease of operation improves for turning corners, but the stability deteriorates during high-speed operation and slippery conditions
Solution Approach 1:
The damping mechanism is designed to be dynamically adjustable, with damping force varying based on vehicle speed and articulation angle. At low speeds and large articulation angles, damping is reduced to facilitate easy turning. At high speeds or during jack-knife conditions, damping increases automatically to maintain vehicle stability
Solution Approach 2:
The damping parameter is changed dynamically based on operating conditions. The control units adjust the damping force by modifying hydraulic pressure in response to signals from sensors detecting vehicle speed, articulation angle, and articulation angle rate, optimizing both ease of operation and stability for different driving scenarios
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
Ensures safe and stable vehicle operation by maintaining control of the articulation mechanism even if one control unit fails, allowing continued driving to a service garage, and provides optimal damping for various driving conditions.
Implementation Method 1
The articulation mechanism is provided with two damping means in the form of hydraulic damping cylinders 23, 24, which are used to provide a suitable and variable damping constant
Implementation Method 2
Each cylinder 23, 24 is controlled by a proportional valve 25, 26, respectively
Data Source
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AI summary
The present invention relates to an articulation control system for use with an articulated vehicle (10) having a front vehicle body (11) and a rear vehicle body (12), said front and rear vehicle bodies (11, 12) being arranged to be connected together by articulation means (13) comprising first damping means and second damping means for providing relative rotation relative to each other, said system comprising control means for controlling said rotation by controlling said first damping means and said second damping means. The system includes a first control unit (31) for controlling said first damping means, and a second control unit (32), separate from said first control unit (31), for controlling said second damping means. The present invention also relates to a vehicle.