3026219 - E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT - Functional description
Functional description
The engine control unit
M10
monitors
and controls the entire electronic injection system.
The system is supplied directly by the battery
via a line protected by the maxifuse CVM located on the battery,
connector
B99
.
The supply controlled by the ignition (15/554)
reaches pin 58 of
M10
from the line protected by fuse F16
of the engine compartment unit
B1
.
The main injection relay T9 of B1
controls the entire system; the supply line is protected by fuse
F18 of B1; it is energized by a control signal (earth) coming from
pin 13 of the control unit M10, and thus sends a supply:
- to pin 4 of the actual control unit, via the line from
fuse F17 of B1 ;
- to pin 5 of the actual control unit, via the line from
fuse F22 of B1 ;
- to the oil level sensor K31 , to the air flow meter K41 , to the solenoid valves L30 , L36 ; L62 ,
to the control unit M15 , via the line from fuse F11 of B1
The fuel pump relay T10 of
B1
is
supplied by the line of the fuse F21 of
B1
.
It is energized by a control signal (earth)
from pin 24 of control unit
M10
and supplies power to fuel
pump
N40
, which is earthed through the inertia switch
I50
,
which cuts off the circuit in the case of a crash and so prevents
the dangerous spilling of fuel.
Pins 1, 2 and 3 of
M10
are earthed.
The diesel pre-heating relay T19 of
B1
is
supplied by the line for fuse F20 of
B1
.
It is energized by a control signal (earth)
coming from pin 23 of the control unit
M10
and supplies
power to the diesel heating resistance
O20
.
Control unit
M15
, responsible for
controlling preheating of heater plugs
A40
, is supplied directly
by the battery via a line protected by fuse F1 of
B1
.
It is supplied, connector C, by the line
for fuse F11 of
B1
and exchanges command and control signals
with pins 22 and 62 of
M10
which controls the timing. Connector
B is connected to the heater plugs
A40.
The engine control unit
M10
receives
signals from the various sensors in order to monitor all engine
operating conditions.
The rpm sensor
K46
provides information
concerning the engine speed through a frequency signal sent to pin
100 of the control unit
M10
. It receives an earth signal
from pin 99 of the control unit. Both signals are weak and are therefore
suitably shielded by pin 101.
Timing sensor
K47
is supplied by
pin 102 of
M10
. It receives a reference earth from pin 104
of the control unit
M10
and sends it a signal of frequency
corresponding to the timing of pin 103.
The engine temperature sensor
K36
,
receives a reference earth from pin 85 of the control unit
M10
and supplies a signal proportional to the temperature of the engine
coolant to pin 84.
The air flow meter
K41
receives
a general supply from the line for fuse 11 of
B1
and a reference
voltage from pin 88 of
M10
. It is supplied by the control
unit from pin 97 of
M10
and sends a signal proportional
to the air flow rate to pin 89.
K41
also contains an air
temperature sensor which sends an air temperature signal to pin
86 of
M10
.
Accelerator pedal
K55
is fitted
with two built-in potentiometers (a main one and a safety back-up).
The first receives power and earth from pins 78 and 76 respectively
of
M10
and sends a corresponding signal to pin 77. The second
receives power and earth from pins 81 and 79, respectively of
M10
and
sends the signal to pin 80.
The fuel temperature sensor
K81
measures the temperature of the diesel entering. It receives a reference
earth from pin 83 of
M10
and sends the fuel temperature
signal to pin 82.
The supercharging sensor
K82
measures
the turbocharger pressure. It is supplied by pin 93 of
M10
and receives a reference earth from pin 95. The signal is sent to
in 94 of the control unit.
The fuel pressure sensor
K83
is
responsible for providing the injection control unit with a feedback
signal for governing injection pressure and duration. It receives
the power and reference earth from pin 90 and 92, respectively of
M10
;
it then sends the pressure signal to pin 91. The fuel pressure regulator
N77
has the task of keeping the value of the fuel pressure
in the accumulator constant. The two control signals come from pins
108 and 109 of the control unit
M10
.
The EGR solenoid
L30
controls exhaust
gas recirculation. it is supplied by the line for fuse F11 of
B1
and is controlled by a signal for pin 16 of
M10
.
The variable geometry solenoid valve
L36
regulates the operation of the turbine according to the engine load:
it is supplied by the line for fuse F11 of
B1
and is controlled by
a signal for pin 17 of
M10
.
The solenoid valve on the throttle casing
L62
shutters and closes the throttle, for example when the engine is
switched off; it is supplied by the line for fuse F11 of
B1
and is controlled by a signal for pin 15 of
M10
.
Pin 59 of
M10
receives the signal
coming from the brake lights switch| ... DATA ERROR - CROPPED TEXT | Ошибка данных - Текст обрезан ... |
|---|