Electronic Engine Speed Control - Isuzu 3CH1-NGZG01 Introduction Manual

TNV_OperationManual_T4(under 19kW).book Page 32 Wednesday, June 17, 2015 11:23 AM
PRODUCT OVERVIEW

Electronic Engine Speed Control

3CE1
■ Start and stop of electronic controlled
engines
The electronic controlled engines have no engine
stop solenoid. The ECU controls the engine
start/stop sequence.
■ Engine performance curves
Figure 20 shows typical engine speed curves that
outline the relationship between engine speed and
load.
Droop control
The VM series engines for general use are
designed so that the engine speed is reduced by a
certain percentage from 30 % load to full rated load.
See curves (1) in Figure 19 below. The same
percentage droop is maintained at any no-load
speed.
Isochronous control
The CL series consists of isochronous design
engines, the speed of which is kept constant from
no load to full rated load. See curves (2) in
Figure 19 below.
Some VM series engines for general use may be
custom-engineered and have the isochronous
capability. Consult the operation manual for the
driven machine for application details of such
engines.
32
1
120 %
110 %
100 %
30 %
800 min -1
Engine speed
Figure 19
Figure 20
Figure 20 Typical operator's console and switch
arrangement
Low-idling speed up
This feature increases the low-idling speed to some
extent depending on the engine coolant
temperature. When the coolant temperature
reaches a predetermined value, this feature returns
the engine speed to the normal low idle setting,
thus reducing the warm-up time.
2
60 % 100 %