A BRIEF HISTORY OF ROLLER TEST BENCHES – Dyno or rolling road
- THE FIRST ROLLER TEST BENCHES (INERTIAL)
The first generations of roller dynamometric benches based their measurements on the concept of inertia, limiting themselves to developing benches with very heavy rollers, equipped with only the rpm sensor. Not being equipped with a brake and load cell, these types of test benches provided approximate and not very repeatable performance measurements.-
- THE BRAKED TEST BENCHES (EQUIPPED WITH EDDY CURRENT BRAKE)
Starting from the 2000s, precisely to improve the product, the first roller benches equipped with eddy current brake and load cell appeared on the market, capable of offering repeatability and precision.
These ‘braked test benches’, in addition to greater reliability, are immediately reflected on the market, also thanks to the possibility of measuring the dissipated power (the inevitable dispersions of energy, due to mechanical transmission from the engine crankshaft to the tires) through a test called COAST-DOWN (more info here)
This type of measurement, called ‘engine crankshaft power’, is the right reference to get reliable and repeatable measurements (not influenced by factors such as type of tires, tire pressure, temperatures, etc.)
- AWD TEST BENCHES AND AXES SYNCHRONISATION
In last years, all producer of test benches are offering the front and rear axle mechanical linkage, in order to offer easier testing methods and avoid issues on vehicle transmission. The old synchronization only made through software couldn’t offer safe working conditions, especially with brand new cars produced after 2018.
Get more informations on AWD dynos axes linkage systems here