 printable version
The principle of PMS
Engines of 1.8 / 2.0 L Driving PMS - fuel injection (engines of 1.8 / 2.0 L) 36. Thermostat (only type 124)
40. The diaphragm pressure regulator
41. Diaphragm damper pressure (only type 124)
55. Fuel Filter
60. The system of modulating the pressure mechanism of membrane vacuum regulator ignition timing (only with automatic transmission before)
75. Fuel tank
77. A tank with activated charcoal
82. The pipeline under vacuum
156. The intake manifold
158. The catalyst
159. The exhaust manifold
A1r5. Indication of the coolant temperature
B11 / 3. Coolant temperature sensor
B17. The intake air temperature sensor
G3 / 2. Oxygen sensor
K3 / 1. System partial heating intake manifold (only type 124)
K27. Fuel pump relay
L5. Crankshaft position sensor
M3. Fuel pump
M16 / 6. The executive body of regulation engine speed at idle | N3 / 6. The engine control unit (PMS)
N6. The control unit air conditioning
N30.Ustroystvo ABS control
R16 / 7. Alignment mains plug
R33. CO-potentiometer, only for vehicles without catalyst (abroad)
S2 / 1. Ignition starter switch
S16 / 1. The switch of blocking the starter switch and reversing light
T1 / 1. The ignition coil 1 for cylinders 1 and 4
T1 / 2. The ignition coil 2 for cylinders 2 and 3
W14. Point weight on the holder of the ABS hydraulic unit
X4 / 10. Connection terminal
X11 / 14. Central diagnostic plug to connect the stand
X12 / 3. Terminal 30/15 connecting pads without pridohranitelya
Y62. Injection valve |
A warning  Instead of the thermostat (36) and the regeneration valve (51), engine type 202 (C-class) is equipped with a diverter valve, which is directly controlled by PMS-regulating device.
Fuel from the fuel tank is absorbed and the electric fuel pump is supplied to the injection valve through the fuel filter and the distribution pipe. The pressure regulator on the distribution pipe maintains a constant pressure in the fuel system, depending on the vacuum in the intake pipe. The valve injectors electrical systems and fuel injection is carried out periodically pushes the inlet tube to the inlet valves. This valve injectors are controlled semi-sequential, ie for each revolution of the crankshaft at the same time alternately injects respectively, two valve injectors. If faults in the ignition system is switched off to protect the catalyst corresponding group. Air is drawn through the engine air filter and intake line. The vacuum in the intake manifold sensor is recorded and provides a measure of the amount of let in number. Since the vacuum is dependent on the position of the throttle (accelerator pedal position), the amount of air let in is the criterion of the actual engine load. Therefore, this control system is a P-control, where "P" is a physical value of pressure. The control system in accordance with the frequency of the vacuum and the motor shaft controls the injection time and thus the amount of injected fuel. With a relatively prolonged opening of the injection valve is injected more fuel. An additional sensor and actuator in extreme driving situations and take care of respectively measuring the amount of fuel. The control unit controls fuel injection engine speed during idling by means of its setpoint, which regulates the amount of air during idling around the throttle valve. This ensures a constant engine speed at idle, regardless of whether connected direct additional consumers, such as servo steering or air conditioning compressor. | 1. Multi-plug (side car)
2. Multi-plug (on the side of the engine)
83. The pipeline to the intake manifold, which is under vacuum
R16 / 7. Alignment plug to harmonize fuel
X12 / 3. Terminal 15 connecting pads without fuse |
The engine control device (N3 / 6) located in the engine compartment on the left side. | The fuel pump relay (27) supplies the electrical fuel pump. The safety circuit interrupts the current as soon as no more pulses of the rotational speed, for example, if the engine has been stopped. The relay is located in the luggage compartment on the right side; 1 - battery. |
An oxygen sensor (lambda probe) measures the oxygen content of the exhaust stream and sends appropriate signals to the voltage controller. Thereafter, the control device so controls the injection quantity of fuel, which optimally afterburned exhaust gases on the catalyst. Temperature sensor measures the intake air its temperature, the second temperature sensor to the controller housing coolant changes the temperature of the latter. Solenoid valve for venting a fuel tank is controlled depending on the engine operating condition. The released fuel vapor trapped active carbon filter and the valve are supplied to the combustion. Therefore, due to the filter filled with activated carbon, most of the fuel vapor is used efficiently and not released into the atmosphere. | On the flywheel (1) and the intake camshaft wheel mounted inductive sensors (L5). They transmit information about the actual engine speed and crankshaft positions to the control device of the fuel injection. |
Ignition system no longer has any moving parts and therefore the structure until the spark plug is not subject to wear. If you turn off the engine compartment (pull) equalizing mains plug, you can refuel lower quality. If you again to refuel with gasoline for cars with high performance engine (octane number 96-98, at least 95 ROZ), then again Push equalizing mains plug.
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