ECM egrCAN, Инструкция по эксплуатации, Страница: 9 / 52

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Figure 2: Bosses and Plugs
Attaching the Modules to the Bus
Figure 1 and Appendix A shows a basic (3 module) egrCAN system. egrCAN is a bus-based
measurement system. The bus is composed of Eurofast cables (in 2m, 4m, and 10m lengths),
Tees, termination resistors, and “flexi-cables”. The Eurofast cables contain both CAN
communication wires and power wires for the modules. There is a lot of flexibility in
building the bus with the components (cables, tees, termination resistors, flexi-cables).
Generally speaking, if it screws together and there is a termination resistor at each end of the
bus, it will work.
The bus needs to be powered. Power requirements are 12 to 28V and 2A (steady-state) per
module. Power can either be supplied from a battery or a number of AC/DC power supplies
offered by ECM. To minimize voltage drops, power the bus close to the modules. The
CAN communication is tapped into the bus at the power entry end. This is not a requirement
but it is the way the power entry devices are manufactured. If the distance between the
termination resistor (see * in Figure 1) and the CAN communication device exceeds 2m,
move the termination resistor (120 Ohm) to the CAN communication end of the cable.
In most cases, just LambdaCAN modules are used in egrCAN systems. In some diesel
engine applications, it may be possible to replace the exhaust LambdaCAN module(s) with
NOxCANg modules. When egrCAN systems leave ECM, the modules are labeled “AIR”,
“INTAKEn”, “EXHAUSTm” (where “n” and “m” are numbers for modules of non-basic
systems. ex. where there is more than one intake module). Additionally, the programmed
node id (NID) appears on each module.
P/N 12-04, 18 mm x 1.5 mm Tall
Aluminum Boss, Copper (Cu) Gasket,
and Aluminum Plug.
P/N 12-07, ¼” NPT Aluminum Boss
and Brass Plug, (USA), or
P/N 12-14, ¼” ISO tapered Aluminum
Boss and Brass Plug, (Metric).
P/N 12-05, ¼” NPT Mild Steel Boss
and Brass Plug, (USA), or
P/N 12-12, ¼” ISO tapered Mild Steel Boss
and Brass Plug, (Metric).
P/N 12-02, 18 mm x 1.5 mm Mild Steel Boss
and Stainless Steel Plug. .