a Fixed frequency
b Variable switch-on time
1 Signal voltage
2 Time
The microprocessor transmits output signals to the actuators via specific output stages. The output signals for the actuators can also have different forms:
• Switch signals (switch actuators on and off, such as the A/C clutch),
• PWM (Pulse Width Modulation) signals. PWM signals are square-wave signals with constant frequency, but variable switch-on time. Using these signals electro-pneumatic transducers, for example, can be actuated at any location (for example the boost pressure control solenoid valve or EGR solenoid valve).
The high-performance components for direct actuation of the actuators are integrated in the PCM in such a manner that very good heat dissipation to the housing is ensured.
