Brake and tyre testing - "A few cm accuracy for all automotive braking tests"

   
SPEEDBOX-INS   CATS-INS Complete Automotive Testing System   SPEEDBOX (Standard)
The SPEDBOX-INS is our flagship brake tyre testing product. Featuring unbeatable accuracy, quick and easy setup and testing, with reported measurement accuracy for each test.
   The unbeatable SPEEDBOX-INS packaged into a complete testing system, complete with data logger and display.
   The standard SPEEDBOX is a lower cost option, however it's only suitable for general straight-line speed measurement testing and pedal triggered brake tests.
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Application details:

What good is a measurement if you have no idea how accurate it is?

All SPEEDBOX-INS products continously monitor their own performance and repost the maximum error for each braking test. The maximum error is calculated based on many factors, including GPS quality, using an advanced statistical model. After each bra test the system reports both the braking distance and maximum error, for example 42.33m braking distance and +/-3cm maximum error. Engineers and QA managers can now for the first time be certain that results are valid and measured to acceptible standard.

Test results can be displayed live in a vehicle using a DASH4PRO display. The SPEEDBOX-IBS can be supplied with a data logger and display as part of the CATS-INS integrated system. All triggered tests recorded using one of our data loggers are stored both as logged data for further analysis, and test results as human readable ASCii text file.

No Speed Overshoot

During brake testing, a GPS-only system suffers from speed overshoot, as the brakes are applied the vehicle pitches and the roof mounted GPS antenna accelerates forwards. The time dirrerence as the car decelerates past 100km/h (27.78m/s) and triggers the start of the test is only a few milliseconds (15020ms), but at 100km/h the disatnce travelled in a few milliseconds is significant (~0.5m). The SPEEDBOX-INS allows the measurement point to be accuratley offset to the centre of gravity giving a true speed measurement with no overshoot. The inertial sensors accurately measure pitch and rotation rates to the reference point achieving unbeatable accuracy of just a few cm for all automotive braking tests.

Application Documents:

Performance Testing Quick Start Guide

This PDF guide illustrates the installation, set up and general use of the Complete Automotive Testing System INS for brake testing and performance testing applications.

Brake Testing System

An example brake testing system, looking at repeated braking tests and accelerations causing increased brake disc temperatures. With braking measurements being taken by the SPEEDBOX-INS system, and additional sensor inputs reading disc temeratures and brake line pressures. Additional vehicle data obtained via connection to the vehicle CAN bus, eg. wheel speeds, RPM, throttle position etc.

SPEEDBOX-INS Distance Verification Application Notes

This application note describes a method for comparing distance measurements from a CATS or SPEEDBOX-INS system with a DASH4PRO, to those from a class 1 tape measure. This would be done to verify the measurements.