Method for chassis measurement and a device for measuring the chassis geometry of a vehicle

Abstract

A method according to the invention for chassis measurement includes the steps of providing a chassis measurement system having four measuring heads (2, 4, 14, 16) arranged in known positions relative to one another, each having a monocular image recording device (22, 24, 26, 28), wherein the position of the measuring heads (2, 4, 14, 16) relative to one another is known; recording an image of a wheel (6, 8, 10, 12) or a measurement target applied thereto in an initial position (A) of the vehicle (1) with each of the four measuring heads (2, 4, 14, 16); shifting the vehicle (1) from the initial position (A) into at least one additional position (E); recording an image of a wheel (6, 8, 10, 12) or a measurement target applied thereto of the vehicle (1) in the additional position (E) using each of the four measuring heads (2, 4, 14, 16); recording an image of a reference target that has a known pattern (34, 36) and is attached to the vehicle (1) using one of the four measuring heads (2, 4, 14, 16) in at least one of the initial position (A) and the additional position (E) of the vehicle (1) and determining an absolute scale for the measuring heads (2, 4, 14, 16) therefrom; executing local 3D reconstructions for determining the translation vectors (t1, t2, t3, t4), the rotation vectors (R1, R2, R3, R4) and the angle of rotation of the wheels between the at least two positions (A, E) as well as the centers of rotation of the wheels and the axes of rotation of the wheels (6, 8, 10, 12); and determining the chassis measurement parameters of the vehicle (1), in particular inclination, single track and / or total track, wheelbase and track width.

Description

technical field [0001] The invention relates to a method for measuring a chassis and a device for measuring geometric parameters of a chassis of a motor vehicle. Background technique [0002] Devices are known from DE 107 57 763 and EP 1 042 643 B1 for determining geometrical parameters of wheels and / or axles of a motor vehicle by means of an optical measuring device with at least two camera devices. They relate to so-called stereo measuring systems with binocular (stereo) cameras. Such binocular imaging devices are complex and expensive. [0003] In other shaft measuring systems, such as the one known from US Pat. No. 6,13,47,92, measuring targets provided with matching point regions are used, which must be produced with high precision and are therefore also expensive. Furthermore, such high-precision measuring targets are easily damaged or deformed in the workshop all day long, which will lead to uncontrollable measurement errors. Contents of the invention [0004] It...

AI Technical Summary

Problems solved by technology

This binocular camera setup is cumbersome and expensive

[0003] In other shaft measuring systems, such as the system known from US 613 47 92, measuring targets provided with matching point regions are used, which must be produced with high precision and are therefore also expensive

In addition, such high-precision measurement targets are easily damaged or deformed in the workshop all day long, which will lead to uncontrollable measurement errors

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