Cab-Chassis Relative Position Determination via Environmental Reference Comparison
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Solution Overview
Problem
In highly automated driving systems, accurately determining the relative movement between the cab and chassis of vehicles, such as trucks, is challenging due to the inherent errors in GPS-supported gyro systems and the need to fuse sensor signals from different parts of the vehicle, which are often distorted by the cab's vibrations and shocks.
Innovation Solution
A method using multiple sensor systems, including LiDAR, camera, and ultrasonic systems, to determine the relative position of the cab with respect to the chassis by comparing position points detected by sensors mounted on both parts, allowing for accurate adjustment values to be calculated and used for sensor fusion, thereby enhancing the robustness of automated driving systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS-supported gyro systems are used to determine cab movements, then the relative position can be measured, but the measurements are distorted due to changing GPS antenna position and cab vibrations
Solution Approach 1:
The patent introduces an intermediary object (a stable reference target in the environment) to mediate the measurement process. Instead of directly measuring cab position with GPS/gyro systems that are subject to vibration and position changes, the system uses this stable reference as an intermediary to establish a reliable reference frame for determining relative movements between cab and chassis
Solution Approach 2:
The patent creates a copied reference system by having both the chassis and cab independently detect the same environmental reference target. This copying approach allows the system to compare two independent measurements of the same reference, thereby eliminating errors from GPS antenna position changes and cab vibrations
2Adaptability or versatility
If sensors are mounted both on the chassis and on the cab, then sensor fusion can be performed, but the cab movements must be accurately determined which is difficult with existing methods
Solution Approach 1:
The stable environmental reference target serves as an intermediary that both chassis-mounted and cab-mounted sensors can independently observe. This intermediary enables the system to establish a common reference frame, making it possible to accurately determine relative cab movements and perform sensor fusion without the difficulties associated with traditional GPS/gyro methods
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 method improves the accuracy and robustness of sensor fusion by accurately determining the relative position and movement between the cab and chassis, reducing errors and enhancing the overall performance of highly automated driving systems.
Implementation Method 1
at least one first position point of an object in an environment of the mobile platform relative to the first part of the mobile platform is provided
Implementation Method 2
a first sensor system which detects or represents the environment, for example an optical camera and/or a video system and/or a radar system and/or a LiDAR system
Implementation Method 3
at least one first position point of an object in an environment of the mobile platform relative to the first part of the mobile platform is provided
Implementation Method 4
at least one first position point of an object in an environment of the mobile platform relative to the first part of the mobile platform is provided
Implementation Method 5
at least one first position point of an object in an environment of the mobile platform relative to the first part of the mobile platform is provided
Data Source
AI summary
A method for determining a relative position of a first part of a mobile platform with respect to a second part of the mobile platform. The method includes the following steps: providing at least one first position point of an object in an environment of the mobile platform relative to the first part of the mobile platform; providing at least one second position point of the object in the environment of the mobile platform relative to the second part of the mobile platform; determining the relative position of the first part of the mobile platform with respect to the second part of the mobile platform by comparing the relative position of the at least one first position point with the relative position of the at least one second position point.