Optimized torque measurement in engine test benches

The aim is to further develop the performance of current and future engines in such a way that they meet future standards on the basis of their fuel efficiency and enable leaps in innovation in testing and production technology.

HBM Test and Measurement (HBM) is developing the PMX measurement amplifier system, a precise and interference-free measurement technology platform for test benches to increase the performance of engines.

New filter and scaling options for torque measurement allow precise use in partial-range operation. The torque sensor can be scaled via the highly accurate polynomial characteristic curve or characteristic table with automatic clockwise/anticlockwise rotation detection in the PMX.

HBM has implemented the CASMA (Cranc Angle Synchronous Moving Average) filter for the PMX with moving averaging over the angle of rotation. The new filter design is used, for example, for crank angle-synchronous moving averaging to determine the cylinder-dependent torque distribution.

PMX generates in real time parameters such as power, average and peak values up to torque control by means of PID controller. The PMX amplifier system with its open communication interfaces, in combination with powerful HBM torque sensors, ensures efficient test processes in the automotive sector.