Contactless Speed Measurement in Plate Brake Test Stands
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Solution Overview
Problem
Conventional disk brake testers require complex and time-consuming installations for speed measurement using contact thresholds and separate weight determination, leading to long measurement times and potential errors due to fluctuating environmental conditions.
Innovation Solution
A disk brake tester with a contactless speed measuring device using radar, infrared, or ultrasonic sensors for synchronous detection of braking force and speed, eliminating the need for complex installations and enabling precise, simultaneous measurement of both parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contact thresholds are used for speed measurement, then speed can be measured, but installation complexity and measurement time increase
Solution Approach 1:
The patent replaces the mechanical contact threshold system with a laser-based optical measurement system. The laser sensor measures speed contactlessly by detecting the motion of the vehicle without physical contact, thereby eliminating the complex installation of contact thresholds while maintaining measurement capability.
Solution Approach 2:
The patent introduces a laser sensor as an intermediary device that mediates between the vehicle motion and the measurement system. The laser beam acts as an intermediary that detects vehicle speed through optical interaction without requiring physical contact points on the vehicle.
2Measurement precision
If contact thresholds are used for speed measurement, then speed can be measured, but measurement time increases
Solution Approach 1:
The patent replaces the mechanical contact threshold system with a laser-based optical measurement system that operates without physical contact. This substitution eliminates the time required for installing and calibrating contact thresholds, significantly reducing measurement time while maintaining speed measurement accuracy.
Solution Approach 2:
The laser measurement system is pre-configured and ready for immediate use, eliminating the need for preliminary installation of contact thresholds. The system can begin measurements immediately when the vehicle enters the measurement zone, reducing overall measurement time.
3Reliability
If vehicle weight is determined separately for legal compliance, then compliance can be verified, but device complexity and handling difficulty increase
Solution Approach 1:
The patent merges the speed measurement function with the existing brake testing system into a single integrated setup. The laser sensor is positioned to measure vehicle speed during the brake test without requiring separate weight determination equipment, thereby verifying compliance while reducing overall system complexity.
Solution Approach 2:
The laser measurement system serves multiple functions: it measures vehicle speed for brake testing and can be used for various vehicle types without reconfiguration. This multi-functionality eliminates the need for separate specialized equipment for different measurement tasks.
4Reliability
If complex extrapolation is performed for vehicle weight projection, then legal compliance can be assessed, but measurement reliability decreases due to environmental fluctuations
Solution Approach 1:
The patent replaces complex computational extrapolation methods with direct laser-based optical measurement. The laser system directly measures vehicle speed parameters without requiring environmental compensation calculations, thereby maintaining measurement precision while ensuring reliable compliance assessment.
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 approach simplifies and enhances the reliability of brake testing by allowing precise, contactless speed measurement and synchronous data acquisition, reducing measurement times and errors, and enabling accurate graphical representation and evaluation of the braking process.
Implementation Method 1
the speed measuring device is designed for contactless measurement of the speed, in particular having a radar and/or infrared and/or ultrasonic sensor
Implementation Method 2
the speed measuring device is designed for contactless measurement of the speed, in particular having a radar and/or infrared and/or ultrasonic sensor
Implementation Method 3
the speed measuring device is designed for contactless measurement of the speed, in particular having a radar and/or infrared and/or ultrasonic sensor
Data Source
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AI summary
The invention relates to a plate brake test stand comprising a braking force measuring device and a speed measuring device, wherein during a measuring operation for testing the brakes of a vehicle not only the braking force but also the speed of the vehicle is measured for predeterminable data evaluation. With regard to simple and secure measurement of the braking force the plate brake test stand is configured and modified in such a way that the speed measuring device is designed for contactless measurement of the speed. The invention further relates to a method for testing the brakes in vehicles by means of a plate brake test stand comprising a braking force measuring device and a speed measuring device, wherein during a measuring operation for testing the brakes of a vehicle not only the braking force but also the speed of the vehicle is measured for predeterminable data evaluation. The method is configured and modified in such a way that the detection of the braking force and of the speed take place synchronously.