| 主权项 |
1. A method for pneumatically driving a turbocharger rotor (1) in a balancing machine, in which the propulsive power of a pneumatic drive is controlled in dependence upon the rotational frequency of the turbocharger rotor (1) by means of a programmable logic control device (24) having an adjustable internal controller (25), wherein the rotational frequency of the turbocharger rotor is detected by a speed sensor (26) and the speed signal is transmitted to the controller (25) as actual value, and wherein parameters necessary for the control are determined empirically by a tuning run comprising the following steps:
(a) tuning the controller (25) to an exclusively proportional control action with high gain Kp and input of the nominal balancing speed as target value for the controller (25); (b) starting the pneumatic drive and accelerating the turbocharger rotor (1), monitoring the actual speed of the turbocharger rotor (1) and comparing the actual speed with the target value, continuing with step (c) if the actual speed exceeds the set target value, or continuing with step (d) if the actual speed is below the set target value; (c) terminating the drive and decelerating the turbocharger rotor (1), halving the gain Kp of the controller (25) and repeating step (b); (d) approximating the actual speed to the target speed by generating an additional target value and additively applying the additional target value to the set target value and incrementing or decrementing the additional target value until the target speed of the turbocharger rotor (1) is reached; and (e) storing the determined gain Kp of the controller (25), the set target value and the determined additional target value as parameters ready to be accessed for controlling future measuring runs of the turbocharger rotor (1) subjected to the tuning run and further turbocharger rotors of corresponding type. |
