S-class W202 Mercedes
1993-2000 of release
Repair and car operation
+ 1.2. General information
+ 2. Maintenance
+ 3. Engines
+ 4. Greasing system
+ 5. Cooling system
+ 6. Heating, ventilation
+ 7. Ignition system
- 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 fuel injection
8.2.3. Air flowmeter
8.2.4. A temperature-sensitive element of cooling liquid
8.2.5. The sensor of soaked-up air
8.2.6. System of vacuum pipelines
8.2.7. The fuel distributor with klapanny nozzles
8.2.8. Klapannye of a nozzle
8.2.9. Oxygen sensor (lambda probe)
8.2.10. Diagnostics of malfunctions of system of injection of gasoline
8.2.11. That it is necessary to know to the owner of the car with the injector engine
8.2.12. Turbo doctor
+ 8.3. System of injection and food 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. Electroschemes
220.127.116.11. Principle of work of PMS
Engines in volume of 1,8/2,0 l
PMS scheme – systems of injection of fuel (engines in volume of 1,8/2,0 l)
Fuel from a fuel tank is soaked up by the electric fuel pump and moves to klapanny nozzles via the fuel filter and the distributive pipeline. The pressure regulator on the distributive pipeline supports to constants pressure in fuel system depending on depression in an inlet pipe. Klapannye nozzles cope electric systems, and injection of fuel is carried out periodically, pushes in an inlet pipe in front of inlet valves. Thus klapanny nozzles cope poluposledovatelno, i.e. on each turn of a cranked shaft at the same time alternately injects respectively two klapanny nozzles. At malfunctions in ignition system for protection of the catalyst the relevant 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 quantity 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 as R-management where "R" is physical size 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 injected fuel. At rather long opening of a klapanny nozzle more fuel is injected. The additional sensor and executive links in extreme road situations care also of respectively measured amounts of fuel.
The actuation device of system of injection of fuel regulates frequency of rotation of a shaft of the engine in an idling mode by means of its zadatchik which regulates amount of air in an idling mode round a butterfly valve. Thanks to it constant frequency of rotation of a shaft of the engine in an idling mode irrespective of, whether direct additional consumers, such as the steering mechanism with the amplifier or the conditioner compressor are connected is reached.
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 on the actuation device. After that the actuation device so regulates injected amount of fuel that fulfilled gases optimum дожигаются on the catalyst.
The temperature-sensitive element of let-in air takes its temperature, the second temperature-sensitive element on the case of a regulator of supply of cooling liquid changes temperature of the last.
The electromagnetic valve for aeration of a fuel tank copes depending on power setting. The allocated pairs 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, pairs of fuel mostly economically are used and do not get to the atmosphere.
The ignition system any more has no moving elements of a design and consequently up to spark plugs is not subject to wear. If in a motor compartment to disconnect to (pull together) leveling shtekkerny socket, it is possible to refuel fuel of more poor quality. If you again refuel gasoline for cars with the high-forced engines (the octane number 96–98, not less than 95 ROZ), again get leveling shtekkerny socket.