DEVICE FOR MEASURING MOVEMENT OF A ROTATING BODY

摘要

The invention relates to a device for measuring the speed of a roller which moves relative to a camshaft. The roller is fitted at the lower end of a piston which forms part of a high-pressure pump for a fuel injection system of a combustion engine (101 ). The roller is magnetic and a magnetic field sensor is situated inside the piston, close to the roller's journal. When the roller moves towards the camshaft, a periodic signal is generated which can be compared with the camshaft's rotation to make it possible to detect sliding of the roller.