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BMW 5 Series E39since 1996-2001 releaseRepair and operation of the car |
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BMW E39 + Introduction + Maintenance instruction + Current leaving and service + Engine + Cooling systems, heating - Power supply system and release + Power supply system + System of injection of the petrol engine + Power supply system of the diesel engine - System of production of the fulfilled gases Operation of the catalytic converter Security measures for cars with the catalytic converter Removal and installation of system of release Replacement of the main muffler Removal and installation of the sensor of oxygen Check of tightness of system of release + Engine electric equipment + Manual transmission + Automatic transmission + Coupling and power shafts + Brake system + Suspension bracket and steering + Body + Onboard electric equipment + Schemes of electric equipment + System of onboard diagnostics |
Operation of the catalytic converter All engines are equipped with the catalytic converter for purification of the fulfilled gases. Petrol engines The electronically controlled system of injection in combination with the sensor of oxygen allows to dose precisely amount of injectable fuel that in turn reduces harmful emissions in the atmosphere. The sensor of oxygen is in a reception pipe in front of the catalytic converter and is washed by a stream of the fulfilled gases. The sensor of oxygen represents the electronic sensor measuring the content of oxygen in final gases and representing result of measurement a type of fluctuations of tension. Information from the sensor of oxygen is transferred to the control unit of system of injection. The received value allows to regulate composition of air-petrol mix. On the one hand it is necessary in view of continuous change of service conditions (idling, full gas), on the other hand, since optimum reburning of fuel in the catalytic converter happens only in this case if final gases contain enough gasoline. That in the catalytic converter at a temperature of 300 - 800 °C there was a fuel reburning, in fuel mix it is necessary to have the bigger content of fuel, than for pure burning. Diesel engines Cars with diesel engines are also equipped with the catalytic converter. However adjustment of composition of mix is impossible here. The catalytic converter reduces emission of carbon monoxide, harmful to the environment, and hydrocarbon to value considerably smaller, than at the petrol engine. Besides, catalytic converter reduces a smell of exhaust gases, characteristic of the diesel engine. Higher concentration of oxides of nitrogen at the diesel engine decreases by means of system of recirculation of the fulfilled gases. |
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