Test & measurement
EVOLVED WHEEL TORQUE TRANSDUCERS FOR MEASURING ROLLING RESISTANCE ON COMMERCIAL VEHICLES
T
he RoaDyn P1HT wheel torque transducer is designed for heavy-duty vehicles (HDV) and has a measuring range of 50,000 N·m (high range) or 5,000 N·m (low range); it has been an integral part of the research and development for trucks and buses for several years. The RoaDyn P1(ST/MT/HT) wheel torque transducer has now undergone a fundamental redesign and significant modifications, resulting in even greater reliability and longer service life. The torque wheel is also available for light commercial vehicles and medium trucks and buses in the appropriate configuration and measuring range.
Six piezoelectric single-component precision load cells, each containing two piezo force sensors, are installed in a P1HT torque wheel. The force sensors have been optimised, the cabling of the load cells simplified and the housing’s protection against the effects of weather, dirt and corrosion has been improved. All measures are based on practical experience and the industry’s ever-increasing demands.
EXISTING WHEEL TORQUE TRANSDUCERS CAN BE UPGRADED THANKS TO THEIR MODULAR DESIGN
The further development of the RoaDyn P1ST/ MT/HT wheel torque transducers has been designed so that existing torque wheels can be upgraded with the new components. Users can rely on maximum compatibility. Existing customers do not need to replace the entire wheel force transducer. The load cells currently installed will simply be replaced with the new components and optimised cabling; no reconfiguration is required. Kistler offers its customers the upgrade as a special service, thereby ensuring maximum sustainability and investment protection. A less complex design not only increases reliability and service life, customers also benefit from lower costs compared to a completely new investment. Effective immediately, only the advanced technology will be used.
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Vehicle dynamics and driving resistance measurements are not only of great importance in the field of research and development. Commercial vehicles must meet a specified CO₂ emission standard for registration in the European Union. A wide range of factors must be considered when determining emission levels, including the mandatory measurement of traction torque. With the RoaDyn P1 wheel torque transducer (WTT) series, which is available for light commercial vehicles (small trucks) (ST), medium trucks (MT) and heavy trucks (HT), Kistler makes a valuable and indispensable contribution here.
FOCUSING ON ROLLING RESISTANCE MEASUREMENTS ACCORDING TO THE EU CO2 EMISSION REGULATION In addition to typical applications such as research and development in the field of dynamic control systems, determining powertrain efficiency, measuring vehicle performance or analysing fading effects in brakes, the wheel torque transducer is a key component in determining
the CO₂ emissions of light, medium and heavy- duty commercial vehicles. Since 2025, stricter guideline values have applied to commercial vehicles over 3.5 tons on the basis of the EU’s CO₂ Emissions Regulation, which will be further tightened in a next step in 2030. To determine the CO₂ emissions, measured values for air resistance (Cd x A), the rolling resistance coefficient (RRC), engine performance maps, transmission and
August 2026 Instrumentation Monthly
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