Diesel Engine Actuators
Sensors provide data to the ECM and actuators carry out the computer’s commands. The primary actuators are the electronic injectors, part and parcel of any EMS. Another almost universal type of actuator is the electronic governor. Figure 6-11 sketches the “drive-by-wire” governor used on the Deere 7L 6076 H. A switch on the electronic control module enables the operator to select any of three speed-control programs—true all-speed governing (as used in vehicles), min-max governing (for generator applications), and full-power boost. The latter option has a timer associated with it to prevent engine damage.
Other actuators control fuel pressure, turbo boost and, in some applications, exhaust back pressure.