BENDIX ET-S SUSPENDED ELECTRON TREADLE Manuel
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®
™
Bendix
ET- S
& ET-S2
ACTUATOR BODY
MOUNTING
PLATE
CONNECTOR
TREADLE
ET-S
™
FIGURE 1 - ET-S
AND ET-S2
DESCRIPTION
™
™
The ET-S
and ET-S2
bulkhead mounted electronic treadles. On electronically
controlled diesel engines, the electronic treadle fulfills the
same function as a conventional mechanical throttle.
However, rather than transmitting a mechanical force to the
engine governor, the electronic treadle controls engine speed
by supplying a variable electrical voltage to the engine's
electronic controller.
The main components of the ET-S
are: a mounting plate, suspended treadle, potentiometer
(variable resistor), actuator body and base. The selected
potentiometer, chosen for a specific engine application,
provides the electrical link to the engine control system.
OPERATION
The electronic treadles provide smooth, graduated throttle
control through the function of its potentiometer (variable
resistor). The drive shaft of the cam follower assembly
transfers any movement of the treadle to the potentiometer.
™
Suspended Electronic Treadle
ACTUATOR BASE
POTENTIOMETER
MOUNTING
™
TREADLE
™
ELECTRONIC TREADLES
treadles are engine compartment
™
™
and ET-S2
TREADLE
MOUNTING
PLATE
PLATE
CLOSED
THROTTLE
IDLE (OPEN)
OPEN
THROTTLE
(FULL)
FIGURE 2 - OUTPUT VOLTAGE, AS A PERCENTAGE OF
SUPPLY VOLTAGE
8V
treadles
5V
ET-S
™
TREADLE
OUTPUT
VOLTAGE
0V
CLOSED THROTTLE
(OPEN)
FIGURE 3 - OUTPUT VOLTAGE
POTENTIOMETER
TREADLE PIVOT PIN
TREADLE
™
ET-S2
TREADLE
DETROIT
CATERPILLAR
DIESEL
7 - 18%
10 - 20%
74 - 90%
75 - 90%
CATERPILLAR
DETROIT
CUMMINS
DIESEL
OPEN THROTTLE
CUMMINS
5 - 17%
70 - 81%
MAX
RPM
IDLE
(FULL)
1