Asphalt Paver Sensor System for Acceleration-Compensated Inclination Control
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Solution Overview
Problem
Conventional road finisher systems face challenges in maintaining reliable inclination control, especially when the screed is extended or retracted, leading to disturbances from lateral accelerations, which result in slow control responses and reduced paving quality due to the need for reduced speeds to avoid control deviations.
Innovation Solution
A sensor system comprising an inclination sensor, a yaw rate sensor, and a calculation unit that combines signals using a Kalman filter to produce an acceleration-compensated inclination signal, effectively filtering out lateral acceleration interference, allowing for more dynamic control settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the inclination sensor is heavily filtered with large delay time to reduce disturbances from lateral acceleration, then measurement stability is improved, but control response speed deteriorates
Solution Approach 1:
The control system is segmented into two independent channels: a highly dynamic inclination control channel that responds quickly to elevation changes, and a transverse slope control channel that uses filtered inclination signals to maintain stability. This segmentation allows each channel to operate with appropriate filtering levels for its specific control objectives.
Solution Approach 2:
A dedicated transverse slope sensor (accelerometer) is introduced as an intermediary device to measure lateral acceleration disturbances. This sensor's signal is used to compensate for disturbances in the inclination sensor readings, allowing the system to maintain both stability and faster response by removing the need for heavy filtering.
2Speed
If the control is set to be more dynamic with less delay time, then control response speed is improved, but control reliability deteriorates due to disturbances from lateral acceleration
Solution Approach 1:
A transverse slope sensor (accelerometer) is introduced as an intermediary to detect lateral acceleration disturbances. The sensor's output is processed and used to compensate for disturbances in the inclination control system, enabling dynamic control settings without sacrificing reliability.
Solution Approach 2:
The system implements feedback from the transverse slope sensor to the inclination control system. When lateral acceleration is detected, the feedback signal adjusts the control output to compensate for the disturbance, maintaining control reliability even with dynamic (less filtered) inclination sensor settings.
3Measurement precision
If the paving speed is reduced to allow proper control adjustment, then control accuracy is improved, but productivity deteriorates
Solution Approach 1:
The control system is segmented into two independent channels with different dynamic characteristics. The elevation control channel can respond quickly to altitude reference changes without requiring speed reduction, while the transverse slope control channel uses compensated signals to maintain accuracy. This allows the paver to maintain higher speeds while preserving control accuracy.
4Stability of the object's composition
If the inclination sensor has large time constant for stability, then measurement stability is improved, but adaptability to elevation changes deteriorates
Solution Approach 1:
The control system is divided into two independent channels: elevation control and transverse slope control. The elevation control channel uses the inclination sensor with appropriate filtering for stable altitude maintenance, while the transverse slope control channel uses a transverse slope sensor to handle lateral acceleration compensation. This segmentation allows the inclination sensor to be optimized for elevation stability without compromising the system's ability to adapt to elevation changes.
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
This solution enables reliable and dynamic control of the transverse slope, preventing oscillations and maintaining active inclination control during tight curves, thus improving paving quality and process efficiency by allowing higher speeds.
Implementation Method 1
The at least one inclination sensor (10) is designed to determine an inclination of the screed or of a device coupled to the screed
Implementation Method 2
The yaw rate sensor (20) is designed to determine a change in inclination or angle or angular velocity (yaw rate) prevailing on the screed
Implementation Method 3
Based on the inclination signal and the yaw rate signal, an acceleration-compensated inclination signal is calculated and output
Data Source
Figure 1a
Figure 1b~1c
Figure 2a
AI summary
A sensor system for a paver with a screed comprises at least one tilt sensor (10), one yaw rate sensor (20), and one processing unit (30). The at least one tilt sensor (10) outputs a tilt signal for the screed or a device coupled to the screed, and the yaw rate sensor (20) outputs a yaw rate signal for a prevailing yaw rate on the screed. The processing unit (30) calculates an acceleration-compensated signal based on the yaw rate signal and the tilt signal.