E-bike sensor for for better system alignment

17th July 2019

Alex Lynn

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E-Bikes are becoming a more commonplace form of transport on our roads. The growing sales figures and increasing market share highlight their importance within the biking industry. E-Bike manufacturers are continually launching new innovations and technical advancements, such as manufacturer TQ-Systems who have initiated and established the market sector for premium class E-Bikes.

TQ-Systems claim to have technically revolutionised the market with its TQ HPR120S-Motor. An important component is the E-Bike sensor from ZF used for the measurement of the current riding speed.

For premium E-Bikes, all components must be qualitatively and functionally at their finest, from the drive to the battery and wiring. This is also valid for the speed sensor from ZF that in the TQ application delivers 18 pulses per rotation with 18-fold coding.

This results in a much higher resolution as with standard sensors which in practice leads to a finer, more direct appeal of the E-Bike drive – especially at lower speed (e.g. for hill starts). The speed sensor mounted on the back wheel provides the system with precise information on the current speed.

In combination with a torque sensor it enables a better alignment of the overall system. In addition, the ZF sensor is tamper-resistant and always submits precise results.

The E-Bike sensor is developed based on Hall technology and allows the customer to decide if the sensor should have a connector or a cable. The sensors need a continuous power supply of 4.5 to 20 VDC and measures frequencies between one and 2,500Hz. They are designed for a temperature range from -20 to +100°C and fulfil the requirements of IP67.

Originally, the ZF sensor has been developed for ABS applications. In addition to E-bikes, E-scooters are also a typical target market for the small and efficient sensor.