2892621 - E5030 PETROL ENGINE ELECTRONIC MANAGEMENT - Functional description (BIPOWER)
Functional description
The engine control unit
M10 monitors
and controls the entire electronic ignition and injection system.
The control unit is supplied directly by
the battery - at pin 29 - by the line for the maxifuse EFI of
B5
, through the line protected by fuse
B35
.
The supply controlled by the ignition (15/54)
reaches pin 47 from the line protected by fuse
B25
.
Pins 27 and 28 of the control unit
M10
are earthed.The main relay J10 is supplied directly
by the battery from the line for the maxifuse EFI of B5.whilst the
coil supply is controlled by the ignition (15/54) from the line
protected by fuse B25; it is energized by an (earth) signal coming
from pin 15 of the control unit M10 (safety signal which enables
the system, petrol/methane) and, as a result, sends the supply:
- to the methane system relay feed J25 ;
- to the petrol system relay feed J26 , via the
line protected by fuse B36 ;
- to the switching device for the injectors M16
- to the Lambda sensor heater K40 , via the line
protected by fuse B36 ;
- to the vapour recovery solenoid valve L10 through
the line protected by fuse B36 ;
- to the coil A30 ;
The switching button
H95
receives
a supply controlled by the ignition (INT) from the line for fuse
F8
of the junction unit
B1
, in the case of manualy switching
to petrol it sends a signal to pin 11 of the control unit
M10
and the green LED on the actual button also comes on.
According to the control logic, pins 16
and 31 of control unit
M10
enable either the petrol or
methane fuel system, excluding the other system.
When running on petrol, pin 16 sends an
earth signal which energizes the petrol operation relay
J26
: The latter is supplied by the line for maxifuse EFI of
B5
, via the line protected by the specific fuse
B28
and the
coil supplied by the line controlled by the control unit safety
logic, via relay
J10
; when it is energized, it sends the
supply to the electric fuel pump
N40
;
The electric fuel pump
N40
is earthed
through the inertia switch
I50
which, in the case of an
impact, cuts off the circuit and stops the dangerous supply of fuel.
The same signal is sent to the instrument
E50
- pin 10 of connector B - and lights up the special warning light
which signals running on petrol
Pin 31 - methane operation - sends an earth
signal which energizes the methane operation relay
J25
;
the latter is supplied by the line for maxifuse EFI of
B5
and the coil supplied by the line controlled by the control unit
safety logic, via relay
J10
; when it is energized it sends
the supply to the methane adjustment solenoid valve
L61
and to the three methane canister
L60
solenoid valves;
The solenoid valves located on the methane
canisters
L60
are earthed via the inertia switch
I50
which, in the case of an impact, interrupts the circuit and prevents
dangerous leaks of fuel. (for more details on the methane system
safety devices,
see
DESCRIPTION AND OPERATION: 1058 CNG FUEL SYSTEM
).
The engine control unit
M10
receives
signals from the various sensors in order to monitor all engine
service conditions.
The sensor
K46 , through a frequency
signal sent to pins 53 (positive) and 67 (negative) for the control
unit M10 , provides information concerning the engine speed: the
intensity of these two signals is extremely low and therefore they
are appropriately shielded (pin 77).
The timing sensor
K47
receives
a reference supply from pin 68 and a reference earth from pin 54
of
M10
and provides information concerning the engine timing
through a signal sent to pin 69 of control unit
M10
.
The integrated air temperature sensor
K43
receives a reference earth from pin 54; it sends a signal corresponding
to the temperature of the intake air to pin 55 of the control unit.
From pin 68 of
M10
a reference
supply is sent to the sensor
K43
which restores a signal, at
pin 75, proportional to the pressure of the intake air.
The butterfly position sensor
K56
receives a 5 V supply from pin 60 and receives a reference earth
from pin 54; it sends a signal, through a potentiometer, which is
proportional to the opening of the butterfly, to pin 76 of M10.
The engine temperature sensor
K45
, receives a reference earth from pin 54 of the control unit
M10
and supplies a signal proportional to the temperature of the engine
coolant to pin 62 of the control unit.
The detonation sensor
K50 provides information
concerning the onset of detonation in the combustion chamber through
frequency signals: it sends two signals to pins 56 (positive) and
70 (negative ) of M10 ; these signals are also suitably shielded
(pin 63).
The heated Lambda sensor
K40 provides
the control unit M10 with information concerning the correct composition
of the air/fuel mixture: the signal is sent to pin 20 of the control
unit, whilst pin 9 provides the reference earth: the intensity of
these two signals is extremely low and therefore they are appropriately
shielded (pin 44).
The sensor
K40 is heated by a resistance
to ensure correct operation, even when cold; the resistance is supplied
by the main relay J10 through the line protected by fuse B36 .The control unit M10 controls the opening
of the injectors via special signals sent from pins 71, 78 and 79.
The switching between the petrol injectors
N70
and the methane injectors
N72
is managed by the actual
control unit with the assistance of a specific electronic device
M16
.
It consists of a multiple relay supplied,
at pin 3, by the line for maxifuse EFI of B5, via the line protected
by the specific fuse B29 and, with the coils supplied, at pin 14,
by the line controlled by the control unit safety logic, via relay
J10; the coils are energized by two specific signals for control
unit M10:
- petrol operation is controlled by pin 42 of M10 to pin 13 of M16 : this closes the contacts and pins 7,
8, 12 and 15 which supply the petrol injectors N70
- methane operation is controlled by pin 5 of M10 to pin 1 of M16 : this closes the contacts and pins 2,
9 , 10 and 11 which supply the methane injectors N72 .
The control unit
M10
also controls
the coil A30 through the signals for the coil primary winding,
whilst the secondary winding sends the impulse to the spark plugs:
from pin 59 for the pair of cylinders 1 & 4 and from pin 66
for cylinders 2 & 3.
The coil
A30
primary windings receive
a signal to enable opening from main relay
J10
.
The idle actuator
N74
regulates
the butterfly by-pass line. It is controlled by the control unit
M10
through the signals from pins 57, 58, 64 and 65.
Fuel vapour recovery solenoid
L10
allows fuel vapours to pass through to the engine intake where
they join the mixture entering the combustion chamber. The valve
L10
, supplied by the main relay J10 , is opened by the control unit
when the engine is loaded by a signal from pin 52 of M10 .
The control unit
M10
is connected
with the CODE control unit
M20
through the special serial
line from pin 13; this way, if the CODE control unit does not detect
a correct code, it does not give the go ahead and the engine is
not started up. (
See E7010 CODE
).
The control unit is equipped with an auto-diagnostic
system which can be used by connecting the unit to the connector
R10
: it receives signals from pin 25 from the control unit M10 through
the special diagnostic line.
The auto-diagnostic system also
produces the signal for the "injection failure" warning
light in the instrument
E50
, which comes from pin 26 of
the control unit
M10
.
If the engine temperature is high, the control
unit causes the relevant warning light in the instrument panel
E50
to come on (signal from pin 17 of
M10
).
The speedometer signal (vehicle speed) reaches
pin 50 of the control unit M10 (
See E4010 INSTRUMENT PANEL
).
The control unit
M10
is connected
with the air conditioning system through pins 41 and 48. This makes
it possible to adjust the engine idle speed as the load increases
each time the compressor is switched on or to switch off the compressor
in the case of high engine speed or load conditions (
See E6021 COMPRESSOR ENGAGEMENT| ... DATA ERROR - CROPPED TEXT | Ошибка данных - Текст обрезан ... |
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