Active Suspension Platform Leveling for Vehicle Pitch and Roll
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Solution Overview
Problem
Special-purpose vehicles face challenges in maintaining a horizontal platform during uneven road conditions, leading to reduced operation efficiency and increased accident risks due to pitch and roll movements.
Innovation Solution
An in-vehicle stable platform system employing active suspension, equipped with an inertial measurement device, electronic control device, servo controller, suspension servo actuation cylinders, and displacement sensors, which measures and adjusts the pitch and roll angles to maintain a horizontal platform by controlling the extension/retraction of the suspension servo actuation cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If active suspension control is implemented to maintain horizontal platform during traveling, then platform stability is improved, but device complexity increases
Solution Approach 1:
The suspension system is divided into multiple independent suspension servo actuation cylinders (front left, front right, rear left, rear right), each controlled separately. This segmentation allows independent adjustment of each wheel's suspension force, enabling precise control of platform orientation while maintaining manageable system complexity through modular architecture.
Solution Approach 2:
The system employs inertial measurement devices (accelerometers and gyroscopes) to continuously monitor platform pitch and roll angles, feeding this data back to the electronic control device. The control device processes this feedback information and dynamically adjusts the suspension actuation cylinders to counteract detected tilts, maintaining horizontal platform stability through closed-loop control.
2Measurement precision
If real-time pitch and roll angle measurement is implemented, then platform orientation control precision is improved, but measurement and control difficulty increases
Solution Approach 1:
The system replaces complex mechanical angle measurement mechanisms with electronic inertial measurement devices (accelerometers and gyroscopes). These electronic sensors directly output digital signals representing pitch and roll angles, eliminating the need for mechanical linkages, gears, or optical encoders, thereby simplifying the measurement system while achieving high precision.
Solution Approach 2:
The electronic control device serves as an intermediary that receives raw data from inertial measurement devices, processes this information to determine required suspension adjustments, and translates it into control commands for the suspension servo actuation cylinders. This intermediary layer simplifies the overall control architecture by centralizing the computation and decision-making process.
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 system effectively maintains the in-vehicle platform horizontal, enhancing operation efficiency and safety by reducing tilt and swing, thereby improving the performance of special-purpose vehicles like cranes, fire engines, ambulances, and photographic vehicles on uneven roads.
Implementation Method 1
an inertial measurement device... measures a pitch angle and a roll angle of the in-vehicle stable platform
Implementation Method 2
an inertial measurement device... measures a pitch angle and a roll angle
Implementation Method 3
suspension servo actuation cylinders... controlling the extension/retraction of the suspension servo actuation cylinders
Data Source
AI summary
An in-vehicle stable platform system employing active suspension and a control method thereof is provided. The system includes a vehicle body, an in-vehicle stable platform, an inertial measurement device, an electronic control device, a servo controller set, multiple wheels, and suspension servo actuation cylinders and displacement sensors respectively corresponding to the wheels. The wheels are divided into three groups, which form three support points. The heights of the three support points are controlled to control orientation of the vehicle body. An amount of extension/retraction of the suspension servo actuation cylinders required to cause the in-vehicle stable platform to return to a horizontal level is calculated according to a measured pitch angle and a roll angle of the in-vehicle stable platform, and when a vehicle travels on an uneven road, the extension/retraction of each suspension servo actuation cylinder is controlled to cause the in-vehicle stable platform to be horizontal.