Valvetronic Motors

Valvetronic Motors: Two DC motors (2) are fitted to adjust the two eccentric shafts. They are operated at a frequency of 16 kHz in order to make exact adjustments. In order to position the motors exactly, the polarity is briefly reversed once the target position has been reached (as identified by the ECM). This generates braking torque which immediately stops the motors.







The eccentric shaft sensors continuously monitor the position of the Valvetronic assembly The self-stopping of the motors and the worm gear drives prevents position changes when the system is deactivated. If automatic adjustment is not detected, the fault is recorded and the motors are moved back to the target position.

The adjustment time required to move the motors from the minimum to the maximum valve lift is approximately 300 ms. The motors can peak up to 100 Amps during adjustment.