Mercedes of the S-class W202
1993-2000 of release
Repair and operation of the car
+ 1.2. General information
+ 2. Maintenance
+ 3. Engines
+ 4. Lubrication system
+ 5. Cooling system
+ 6. Heating, ventilation
+ 7. System of ignition
- 8. Fuel system
+ 8.1.1. Introduction
- 8.2. System of injection of petrol engines
188.8.131.52. Principle of work of PMS
184.108.40.206. Principle of work of HFM
8.2.2. Self-diagnosing of a condition of system of ignition and injection of fuel
8.2.3. Air flowmeter
8.2.4. Thermal sensor of cooling liquid
8.2.5. The sensor of the soaked-up air
8.2.6. System of vacuum pipelines
8.2.7. The fuel distributor with valvate nozzles
8.2.8. Valvate nozzles
8.2.9. Oxygen sensor (lambda probe)
8.2.10. Diagnostics of malfunctions of system of injection of gasoline
8.2.11. What should be known to the owner of the car with the injector engine
8.2.12. Turbo doctor
+ 8.3. System of injection and power supply of diesel engines
+ 8.4. System of production of exhaust gases
+ 9. Transmission
+ 10. Running gear
+ 11. Steering
+ 12. Brake system
+ 13. Body
+ 14. Electric equipment
+ 14.2. Electrical circuitries
1,8 / 2,0 l engines
The scheme PMS – systems of injection of fuel (the 1,8 / 2,0 l engines)
Fuel from the fuel tank is soaked up by the electric fuel pump and moves to valvate nozzles via the fuel filter and the distributive pipeline. Pressure regulator on the distributive pipeline supports to constants pressure in fuel system depending on depression in an inlet pipe. Valvate nozzles cope electric systems, and injection of fuel is carried out periodically, pushes in an inlet pipe in front of inlet valves. At the same time valvate nozzles cope poluposledovatelno, i.e. on each turn of a bent shaft at the same time alternately injects respectively two valvate nozzles. At malfunctions in system of ignition for protection of the catalyst the corresponding group is disconnected.
Air is sucked in by the engine via the air filter and the inlet gas pipeline. Depression in the inlet gas pipeline is registered a sensitive element and serves as criterion of amount of the let-in quantity. As depression depends on the provision of a butterfly valve (the provision of a pedal of an accelerator), the amount of the let-in air is criterion of the actual loading of the engine. Therefore this control system is called R-management where "Р" is the physical quantity of pressure.
The control system according to depression and this frequency of rotation of a shaft of the engine regulates injection time and by that amount of injectable fuel. At rather long opening of a valvate nozzle more fuel is injected. The additional sensor and executive links in extreme road situations care also about respectively the measured amounts of fuel.
The actuation device of system of injection of fuel regulates the frequency of rotation of a shaft of the engine in the idling mode by means of its control point adjustment which regulates amount of air in the idling mode around a butterfly valve. Thanks to it the constant frequency of rotation of a shaft of the engine in the idling mode is reached irrespective of whether direct additional consumers, such as the steering mechanism with the amplifier or the conditioner compressor are connected.
The control unit the engine (N3/6) is in a motor compartment on the left side.
The oxygen sensor (lambda probe) measures the content of oxygen in a stream of exhaust gases and sends the corresponding signals of tension to the actuation device. After that the actuation device so regulates injectable amount of fuel that the fulfilled gases optimum are burned up on the catalyst.
The thermal sensor of the let-in air takes its temperature, the second thermal sensor on the case of the regulator of supply of cooling liquid changes temperature of the last.
The electromagnetic valve for aeration of the fuel tank is operated depending on power setting. The emitted vapors of fuel are caught by the filter with absorbent carbon and via the valve move on combustion. Therefore, thanks to the filter filled with absorbent carbon, fuel vapors mostly economically are used and do not get to the atmosphere.
The system of ignition has no moving elements of a design any more and therefore up to spark plugs it is not subject to wear. If in a motor compartment to disconnect (to pull together) the leveling shtekkerny socket, then it is possible to fuel more poor quality. If you refuel gasoline for cars with the high-forced engines again (octane number 96–98, not less than 95 ROZ), then again spread the leveling shtekkerny socket.