Bendix Commercial Vehicle Systems eTrac Automated Air Pressure Transfer System - Manual (Page 6)

6
DEL SUP EX H
Drive Axle Tag Axle
• The Bendix ® Smart ATC ™ continues to work
during the traction event.
• The air pressure in the drive axle suspension
air bags is increased up to the pre-determined
pressure limit.
• When the pre-determined pressure limit is
reached, the inner mechanism within the limiting
valve moves and this results in the air bag
pressure in the drive axle suspension air bags
being held at that pressure.
• The inner mechanism of the backfeed valve also
moves at the pressure limit and delivers air to the
“dump” valve piston. The “dump” valve applied
position delivers air pressure to the tag axle
suspension air bags proportional to the pressure
applied to the dump valve piston.
• The Bendix eTrac system intervention (during
which the solenoid valve remains in the CLOSED
position) automatically ends five (5) seconds after
the traction event ends.
4.3 Automatic Mode: Bendix ® eTrac ™ System Active Mode with Pressure-Limiting Mode.
Figure 5 shows the Bendix eTrac system in its Pressure-Limiting Mode.
The Bendix eTrac system adds up to a
pre-determined amount of air pressure to the drive
axle suspension air bags
The system allows the leveling
valve to re-inflate the tag axle
suspension air bags as required
SER
SUP
DEL
SUP
DEL
EXH
EXH
EXH
SUP
DEL DEL
D Air supply
Double check valve
Pressure protection valve
Solenoid valve
(CLOSED)
Backfeed
valve
Limiting
valve
Delivery to the drive
axle suspension air
bag held
Air supply delivered
to the tag axle
suspension air bag as
required
“Dump” valve
LEVELING
VALVE
Bendix ®
brand ABS
controller
FIGURE 5 - BENDIX ® eTrac ™ SYSTEM PRESSURE-LIMITING MODE
SUP