6 Regulating Linkage
Digital Positioning System 2000 15
6 Regulating Linkage
6.1 Length of Lever Arm
The length of the lever arm is determined in such a way that approx. 90 % of the governor
output shaft adjustment angle can be used. Based on this, the rack length L of governors
with 68° adjustment angle is calculated as L = 1.8 a, "a" being the travel distance of the
injection pump or the carburettor.
6.2 Connecting Linkage
The connecting linkage from the governor to the injection pump or the carburettor should
be length-adjustable and have a (pressure or tension) elastic link. If the actuators torque is
less than 10 Nm, the elastic link is not needed. If possible, joint rod heads in accordance
with DIN 648 should be used as connecting links. The linkage must operate easily and
without clearance.
In case of friction or backlash in the linkage connecting actuator and injection pump resp.
throttle valve no optimal control is possible.
6.3 Linkage Adjustment for Diesel Engines
The length of the connecting linkage is adjusted in such a way that with the governor in
stop position the injection pump is set to 0 - 2 fuel marks. (Travel of the injection pump
control rack is limited by the governor.)
Figure 5: Example of linkage for diesel engines
The resistance of the pressure elastic link is overcome when the control rack has reached
the full load stop and the speed continues to decrease (overload). Furthermore, the elastic
link is overcome when stopping via the emergency switch.
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