Slipform Paver Track Speed Control for Accurate Cornering
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Solution Overview
Problem
Self-propelled construction machines with single left and right chain drives, such as slipform pavers, face limitations in maintaining accurate alignment and path-following during cornering, leading to misalignment of the working device and structures being erected.
Innovation Solution
A self-propelled construction machine with a control and computing unit that adjusts the chain speeds of the left and right chain drives based on the distance between reference points and the specified path, allowing for targeted steering corrections to ensure the rear reference point follows the path, even during curved movements, using sensors or GPS for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the construction machine uses a single left and right chain drive for propulsion, then the machine structure is simplified and ease of manufacture is improved, but the steerability and ability to follow specified path accurately deteriorates
Solution Approach 1:
The patent applies dynamics by making the chain speeds variable rather than fixed. The control and computing unit dynamically adjusts the chain speeds of the left and right chain drives based on real-time position feedback from sensors or GPS, enabling the machine to adapt its steering behavior to follow the specified path accurately while maintaining the simple single chain drive structure.
2Device complexity
If the chain speeds of left and right chain drives are controlled based only on front reference point position, then the control system is simple, but the rear reference point does not follow the specified path accurately
Solution Approach 1:
The patent implements feedback by using sensors or GPS to continuously monitor the position of reference points on the machine, comparing the actual position with the desired position on the specified path, and using this information to adjust the chain speeds. This closed-loop control ensures that both front and rear reference points follow the specified path accurately.
Solution Approach 2:
The patent transitions from controlling only the front reference point to considering both front and rear reference points simultaneously. By introducing rear reference point position as an additional control dimension and calculating appropriate chain speed adjustments based on both positions, the system achieves accurate path following for the entire machine length.
3Ease of operation
If the construction machine corners with fixed chain speeds, then the operation is simple, but the working device becomes misaligned and structures are placed incorrectly
Solution Approach 1:
The patent applies dynamics by making the chain speeds variable rather than fixed. The control and computing unit dynamically adjusts the chain speeds of the left and right chain drives based on real-time position feedback from sensors or GPS, enabling the machine to adapt its steering behavior to follow the specified path accurately while maintaining the simple single chain drive structure.
Solution Approach 2:
The patent implements feedback by using sensors or GPS to continuously monitor the position of reference points on the machine, comparing the actual position with the desired position on the specified path, and using this information to adjust the chain speeds. This closed-loop control ensures that both front and rear reference points follow the specified path accurately.
Data Source
Figure 1
Figure 2A~2D
Figure 3A~3D
AI summary
The invention relates to a self-propelled construction machine, which has a drive unit 5 with a left and a right track drive 3A, 3B, in particular a slipform paver, and to a method for controlling a self-propelled construction machine, in particular a slipform paver. The construction machine comprises a machine frame 1, a working unit arranged on the machine frame, a left track drive 3A in the working direction A and a right track drive 3B in the working direction, and a drive unit 5 for driving the left track drive at a predetermined track speed and the right track drive at a predetermined track speed.Furthermore, the construction machine has a control and computing unit 7 configured such that, depending on the distance a between a reference point 9 located forward of the machine frame 1 in the working direction A and a predetermined path 8, the track speed of the left track 3A and/or the track speed of the right track 3B is set such that the forward reference point 9 moves along the predetermined path 8. The control and computing unit 7 is further configured such that, during cornering, depending on the distance b between a reference point 10 located rearward of the machine frame in the working direction and the predetermined path 8, a correction of the control is made such that the distance between the reference point located rearward of the machine frame in the working direction and the predetermined path decreases.