Measurement System for Brake Testing
Innovative brake test system for efficient tests of the wheel brake of vehicles
The imc BRAKE Test System is a comprehensive test solution for those developing modern vehicle brake systems. It consists of a modular data acquisition system, including optional sensor technology and wheel telemetry, and a software package for all common brake tests. It acquires and processes all relevant measurement quantities such as brake force, pedal travel, temperature sensors, interior and exterior noise (microphones) and vibration. Furthermore, the imc Brake Test System allows for synchronous acquisition from digital signal sources, such as imc wheel telemetry for brake disc temperature, and information from vehicle buses and communication networks such as CAN, CAN FD, XCPoE and FlexRay. The tests are performed according to international standards such as ECE, ISO, FMSSV and SAE.
Brake tests require the acquisition of a very wide range of parameters, whether this is brake pressure, brake disc temperature, brake caliper vibration or brake noise like brake squeal. Measurement technology must therefore be sufficiently flexible to adapt to the respective measurement quantities. With imc CRONOSflex, the imc Brake Test System uses a flexible and adaptable hardware platform that has a modular design and can be extended. Furthermore, it offers interfaces for modern vehicle busses such as CAN, CAN FD, FlexRay, XCPoE and many more. This allows sensor data and field bus information to be acquired and evaluated synchronously.
One of the most important parameters of brake tests is brake disc temperature. With Dx-BrakeTemp users have at their disposal a turnkey wheel telemetry system that acquires up to four temperatures directly on the wheel of the vehicle, digitizes the information and transfers it to a receiver inside the vehicle. Due to its robust design, the system has also been designed to withstand harsh environments and all kinds of weather in road tests.
|AMS brake test|
The AMS brake test establishes the braking distance and is internationally recognized. It was developed by the German car magazine Auto Motor und Sport and is used by the ADAC, the German automobile club, as well as by TÜV, the German technical inspection association. Hazard braking is performed by bringing an unloaded vehicle, with cold brakes and a speed of 100 km/h, to a stop. Immediately afterwards, emergency braking with warm brakes is performed 10 times in a row to bring the vehicle from 130 km/h to a stop. Warm braking provides information about the characteristics of the brakes since the temperature of the braking system increases.
|Performance test 1||ABS braking performed 30 times at various (high) speeds, up to maximum heating of the brake disc of approximately 700 °C. Towards the end of the brake actions, cooling of the brake to 150 °C. With the last five brake actions, changes in the effect of braking / friction value of the brake pads under high-temperature stress is examined.|
|Performance test 2||How much pedal force must be generated in order to generate xy pressure in the brake system (pedal force sensor + pressure sensors).|
|Fading test||Measuring brake fade. Undesirable diminishing of the braking effect due to warming of the brake. The friction value of the brake pad decreases on a hot disc.|
|Judder (vibration test)||Judder is vibration caused by the unevenness of the brake disc. This is brought about in vehicle operation by thermal-mechanical effects. For example, driving through still water (puddles) with hot brake discs generates an abrupt temperature change of the brake disc and its material structure and leads to deformation.|
|Cooling test||A series of tests to examine the period of time it takes for the brake disc to cool after braking.|
|Downhill braking||Driving defined inclines in order to document the development of brake warming.|
|Standard friction value measurement||The pedal travel is examined with distance sensors in relation to pressure build-up in the brake. What percentage of the whole pedal travel is necessary to reach pressure xy in the brake system.|
|Distance sensors measure the pedal travel in relation to pressure build-up in the brake. What percentage of the whole pedal travel is necessary to reach pressure xy in the brake system.|
|Acquiring low frequency vibrations and high frequency noise. Data is recorded for the brake itself as well as for the effect on chassis, vehicle body, interior space, and so on. Data export in accordance with VDA 305.|