Engine Electronic Control System - Belarus 3522.5 Operator's Manual

3.2 Engine electronic control system

The engine electronic control system (EECS) is powered directly by the
accumulator battery through two 30 A fuses which are located in the PASU.
The EECS electical connection diagram is presented in figure Б1 of the Annex B
(basic units of the electrical part of SCR system are given on sheet 2 of figure Б1 in Annex
B).
The EECS consists of an engine electronic control unit 10 (figure 3.2.1), an informa-
tion display 6, an integrated electronic panel 7, a switching and protection unit 8; a handle
of fuel feed manual control 5, electronic foot pedals of fuel feed 4 and 11 at direct motion
and on reverse, respectively, all located in tractor cab, and also a sensor of coolant level 1
and a sensor of water presence in the coarse fuel filter 14, mounted to the left on the ex-
pansion tank.
The enumerated units are interconnected by harnesses 13. The engine electronic
control unit 10 is connected with the engine by the engine harness extender 2. The EECS
also includes the electrical part of the SCR (Selective Catalytic Reduction) system, which
is connected via the harness 3 (figure 3.2.1) and is powered by the accumulator battery
through the protection and switching unit 8.
The system of selective catalytic reduction (SCR) includes a tank with urea (AdBlue
agent) 7 (figure 3.2.2), a catalyst 2, a dosing module 8, which is an atomizer to inject urea,
a sensor of exhaust gas temperature in front of a catalyst 4, NOx (nitrogen oxide) sensor
in front of a catalyst 5, NOx sensor after a catalyst 3, a feeding module 1, urea heat valve
in the tank 3 (figure 3.2.5). Also the system includes an ambient temperature sensor 12
(figure 3.2.1), mounted behind under the cab. The urea tank, the feeding module and the
dosing module are interconnected by means of urea supply pipes with inbuilt electrical
heaters (figures 3.2.3 and 3.2.4). A combined level and temperature sensor 6 is mounted
on the urea tank (figure 3.2.2). The NOx (nitrogen oxides) sensor after the catalyst 3 (fig-
ure 3.2.2) is mounted on the catalyst outlet pipe. The NOx sensor modules are mounted
on the bracket, fixed to right of the hood frame. Urea warm-up valve connection is shown
in figure 3.2.5.
Information on exhaust gas temperature before the catalyst, on the lever and tem-
perature of urea (AdBlue agent), water presence in the coarse fuel filter is shown on the
information display.
Description of EECS response to decrease of urea level in the tank is provided in
table 3.1.
SCR electrical connection is shown in figure 3.2.6.
A general structural diagram, illustrating interconnection of SCR system units, is
presented in figure 3.1.6.
Description of operation of SCR units as well as EECS elements, included into the
engine composition, is given in the Engine operation manual, attached to your tractor.
The electronic foot pedals of fuel feed and the handle of fuel feed manual control
are units to control modes of engine operation according to the speed. If two units are op-
erated simultaneously (the pedal is pressed and the handle is shifted), the preference is
given to the unit with a bigger rate of displacement.
A special test jack 9 (figure 3.2.1) is intended to connect a testing system SER-
DIA2010 with an adapter of various access levels to carry out an extended service testing of
the engine in operation. The specified testing system is recommended for dealer centers.
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