Volvo 164 Owner's Manual - page 30
TECHNICAL DESCRIPTION
Fuel system B 30 E
The B 30 F engine is fitted with an electro-
nic fuel injection system.
This system includes an electronic control
unit (7) which converts the impulses from
the various sensors in the engine to con-
trol signals which regulate the six sole-
noid-actuated fuel injectors (15). The con-
trol signals influence the opening times of
the injectors and thereby the amount of
fuel injected.
The mixture of fuel and air is modified the
whole time according to the conditions
under which the engine is running. Engine
speed is governed by the triggering con-
tacts (13) in the distributor, the operating
temperature by the sensor (17) for the
coolant, the temperature of the induced
air by the sensor (1) and the engine load
by the pressure sensor (5) which is con-
nected to the inlet duct. In addition, the
control unit is provided with information
concerning the position of the throttle
valve by means of the throttle valve switch
(2). This information is "computerized" in
the control unit and re-transmitted in the
form of control impulses to the injectors.
Fuel is injected into the inlet ports in the
cylinder head just before the intake valves.
The fuel is delivered to the injectors via
an electric fuel pump (12) which main-
tains a constant pressure of 2 kp/cm
2
(30
psi) in the fuel line with the help of a
pressure regulator (14).
Principle of operation, fuel injection
system B 30 E
1. Temperature sensor for induction air
2. Throttle valve switch
3. Throttle housing
4. Cold start valve
5. Pressure sensor
6. Inlet duct
7. Control unit (electronic)
8. Battery
9. Fuel tank
10. Fuel filter, suction side
11. Fuel filter, discharge side
Partial vacuum in inlet duct
Fuel at atmospheric pressure
Fuel under 2 kp/cm
2
(30 psi)
overpressure
29
12. Fuel pump
13. Triggering contacts in distributor
14. Pressure regulator
15. Injectors
16. Thermal timer contact
17. Temperature sensor for coolant
18. Auxiliary air regulator
19. Idling adjusting screw