Hyundai Yanmar TNV Series Manual page 56

Torque curve and engine regulation
Standard engine torque curves are outlined in Figure 2-25. Details of the curves varies depending on the
engine models.
For the Eco-governor, engine regulations are available in the following variations:
(a) Isochroous
The engine speed is constant, regardless of the load (regulation 0%).
(b) Virtual droop (torque curve of base engine)
Approx. 7% regulation regardless of the engine speed. Regulation other than 7% is available as a spe-
cial option. Contact Yanmar for details.
The engine speed is kept until a torque equivalent to a load factor of approx. 30% is reached, in order
that the idling (non load) speed does not fluctuate even if installation of the engine on a machine caus-
es some power loss.
Even when virtual droop is active, it is possible that the engine speed does not decrease to lower than
the low-idling speed. (Optional).
(c) Reverse droop
Reverse droop provides fine speed control to the engine in a low speed range, preventing engine stall-
ing. This can be active with an external switch.
(c) Rev. Droop(Only low speed)
120%
110%
100%
30%
TNV Application Manual
(b) Img. Droop(Const. regulation:7%)
65 ~ 70%
800min -1
Engine Speed
Figure 2-25 Standard torque curves
CONTROL SYSTEM
(a) Iso-chronous
Mech. Governor Droop
Img. Droop High idol
100%
Iso-chronous High idol
(Rating+30min
-1
)
2-37