BMW 5 series E39

Since 1996-2001 of release

Repair and car operation

Work of system of injection

Fuel is sucked in from a fuel tank by an electric gasoline pump and moves through the fuel filter to a distributive highway and further to injectors. The regulator of pressure at a distributive highway watches that pressure of fuel made 3.5 bar. Injectors have electric management and inject fuel импульсно into the inlet pipeline in front of inlet valves.

Air is soaked up by the engine through the air filter and passes through a measuring instrument of weight of air. In the measuring instrument case there is thin, электрически a warmed up plate which is cooled by a passing stream of air. The control system changes value of a current of heating so that the plate temperature remained a constant.

If, for example, the quantity of soaked up air increases, the plate aspires to be cooled. Thereof value of a current of heating of a plate grows. On deviations of a current of heating the control system of the engine defines a stream of air and, hence, its loading.

The block of management depending on weight of air and number of turns of the engine defines time of injection and, thus, quantity of injected fuel. At longer opening of injectors the quantity of injected fuel increases. Additional gauges watch correct giving of fuel in extreme situations of movement of the car.

Fuel injection occurs consistently. It means that injectors cope individually, and the sequence of injection corresponds to sequence of ignition. By means of a choice of the moment of injection in relation to the moment of opening of inlet valves it is possible to regulate parametres of the fulfilled gas and capacity of the engine.

The potentiometer throttle заслонки is on a shaft заслонки. It hands over to the block of management the information on position заслонки. Thanks to it process of compulsory idling, since, in particular, copes. While заслонка it is closed and simultaneously the number of turns lies above some certain value, the management block stops fuel giving to the engine.

The relay of the fuel pump is in the block of the relay behind the left amortisation rack. The relay submits a current to the fuel pump. The safety switch interrupts fuel giving at the idle engine, for example, if the engine has decayed.

Position of a cranked shaft of the engine and its number of turns are defined by two inductive gauges. The gauge of number of turns is at a pulley of a cranked shaft. The gauge of recognition of the cylinder is in a forward part of the engine in a cover of a box of a chain of a drive of distribution.

Two gauges of oxygen measure the oxygen maintenance in the fulfilled gases and transmit a signal in the management block. On the basis of the received information the management block changes a parity fuel/air that provides optimum reburning of a fuel mix.

The idling regulator operates quantity of air idling bypassing throttle заслонки. It provides maintenance of constant number of turns idling irrespective of connection of additional consumers, as for example, the hydraulic booster of a wheel or the cooling compressor.

The electromagnetic valve of ventilation of a fuel tank copes depending on an engine condition. Steams of gasoline formed in a fuel tank accumulate in an adsorber and through the electromagnetic valve move in the combustion chamber. Gasoline steams, thus, are effectively used and do not get to atmosphere.

The control system of a camshaft, in abbreviated form VANOS, turns a shaft of inlet valves by means of pressure of oil in relation to приводной appreciate depending on number of turns and engine loading. It allows to receive optimum time of opening of valves concerning comfort of idling, the characteristic of a twisting moment and the fuel expense. Block DME operates an oil stream to an adjusting element by means of the electromagnetic valve.

The control of pressure ignition at too low voltage disconnects block DME (for example, owing to cable damage). Thus the engine cannot be started. It excludes damages каталитического the converter.

Communication with other monitors (ABS, ASC, check point management) is carried out through CAN, representing the special tyre of the data. This system, except other, has that advantage that the plait of cables of the engine contains smaller quantity of cables. Such tyre provides higher degree of protection of the car at failure of separate devices.