Reversing Trajectory Overlay for Construction Vehicles
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Solution Overview
Problem
Self-propelled construction machines face difficulties in reversing due to limited visibility of the rear area, making it challenging for operators to navigate and avoid obstacles, especially in confined spaces, as existing driver assistance systems designed for cars are not suitable for these machines with unique steering capabilities and height adjustments.
Innovation Solution
A device that includes a unit for detecting the position of front and rear wheels, a computing unit to determine trajectories, an image recording unit to capture the rear area, and a display unit to superimpose trajectories on the image, allowing operators to estimate movement and adjust steering angles and modes for precise reversing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a camera and screen are used to display the rear area, then the operator can see the rear area, but it is difficult to estimate how the construction machine is moving when reversing
Solution Approach 1:
The patent creates a virtual copy of the real-world trajectory by calculating and displaying a graphical representation of the machine's movement path on the screen. This virtual trajectory overlay allows the operator to see both the rear area through the camera and the predicted movement path simultaneously, enabling accurate estimation of machine movement during reversing operations.
2Adaptability or versatility
If the construction machine is steered with both front and rear wheels to enable tight turns and sideways movement, then the machine can navigate confined spaces, but the operator cannot see the rear area to reverse safely
Solution Approach 1:
The patent introduces a camera as an intermediary device that captures visual information from the rear area and transmits it to the operator's screen. This intermediary system bridges the gap between the operator's limited visibility and the need to safely operate the machine's complex steering capabilities during reversing maneuvers.
3Ease of operation
If existing driver assistance systems for cars are used, then parking support is provided, but they are not suitable for construction machines with unique steering capabilities and height adjustments
Solution Approach 1:
The patent adapts the trajectory calculation system to account for construction machines' unique parameters including variable height adjustments and multiple steering modes (front wheel steering, rear wheel steering, and combined steering). By dynamically adjusting trajectory calculations based on these specific parameters, the system provides accurate movement predictions tailored to construction machine operations rather than generic car-based systems.
Data Source
Figure 1~2
Figure 3A
Figure 3B~3C
AI summary
The invention relates to a self-propelled construction machine comprising a chassis 1 with front and rear wheels or tracks 2, 3; 4, 5 in the working direction I and a height-adjustable machine frame 6, which is supported by the chassis. The construction machine according to the invention is characterized by a device 13 for assisting the operator when reversing, which includes a unit 17 for detecting the position of the front and rear wheels or tracks and a computing unit 16 for determining data that describes at least one trajectory (T1 to T6) of the construction machine as a function of the position of the front and rear wheels or tracks 2, 3; 4, 5, both as a function of a steering angle (α) specified by a control unit and as a function of a steering mode selected by the control unit.Furthermore, the device 13, which assists the machine operator when reversing, includes an image recording unit 15 for recording an image of the rear area of the construction machine and a display unit 14 for displaying the recorded image of the rear area of the construction machine. An image processing unit 18 overlays the representation of at least one trajectory (T1 to T6) describing the movement of the construction machine onto the image of the rear area of the construction machine displayed on the display unit 14.