ERJ staff report (LMH)
Stockholm - Nira Dynamics of LinkÃ¶ping, Sweden, has published a list of myths and facts about indirect tyre pressure monitoring systems (TPMS), which applies to new vehicle models originating from as early as November 2012, and all vehicles which will be newly registered for road traffic from November 2014. /p>
Nira, an automotive software solution company, said that both direct and indirect technologies have different strengths and weaknesses. Nira's main product is iTPMS, which measure tyre pressure using existing signals as the wheel speeds of the ABS / ESP. The iTPMS technology links them with other signals such as the steering angle or the engine torque in an intelligent way so that the tyre pressure can be monitored indirectly - hence the name. /p>
iTPMS are subject to many myths and prejudices, Nira said. Dunlop Tech of Hanau, Germany, and NIRA Dynamics decided to have their products tested by TÃœV SÃ¼d together in order to give the discussion a factual base. Both companies supplied one vehicle each with summer and winter tyres for the test campaign. /p>
Nira said the tests showed that iTPMS not only detect pressure losses on individual wheels, but that the reliable monitoring of all four wheels of slow pressure losses has also become a standard feature. Indirect systems can detect a pressure drop of 20 percent on all four wheels in about 15 minute driving time, four times quicker than legally required, the tests show. /p>
iTPMS systems work not only with all original tyres and rims, they are also compatible with nearly all aftermarket tyres and rims. The current indirect systems are tuned to work optimally with all the original tyres. Furthermore, they are tested with a variety of popular aftermarket tyres to make sure that the drivers do not run into trouble with them later on. Therefore, it is rather the case that iTPMS work normally with almost any tyre legally suitable for the vehicle. /p>
The company also said that tests showed that iTPMS work at high speeds, even above 130 km/h, and it said that the systems are robust against load changes. Modern indirect systems have sophisticated mechanisms for load compensation.
This is an external link and should open in a new window. If the window does not appear, please check your pop-up blocking software. ERJ is not responsible for the content of external sites.
Press release from Nira Dynamics