Auto Manual of VW Passat B5

5.2. Work of a control system as the engine

THE GENERAL DATA

Arrangement of a tape conductor (1) in a measuring instrument of a stream of air


Elements of management throttle заслонкой

1 – a control lever throttle заслонкой; 2 – the idling switch; 3 – a potentiometer of position throttle заслонки. The potentiometer informs the management block on position throttle заслонки; 4 – a servomotor throttle заслонки;

5 – a spring. At a stopping delivery of pressure the spring moves throttle заслонку to a substantive provision. In this position the cable of an accelerator does not move throttle заслонку; 6 – a potentiometer of position of an executive element throttle заслонки. The potentiometer of position of an executive element throttle заслонки transfers to the block of management the data about position of an executive element throttle заслонки.

The control system of the engine is an incorporated system of ignition and fuel injection.

The fuel pump shipped in a fuel tank, submits fuel to a fuel highway through the fuel filter. Pressure of fuel in system copes a pressure regulator. The regulator allows surplus of fuel to come back in a fuel tank at pressure excess in fuel system. The fuel highway is the tank for four fuel atomizers which make fuel injection in inlet channels of cylinders of the engine. The consecutive system of injection of fuel is used, at which atomizers inject fuel independently from each other. The management block operates a fuel atomizer, changing width of an impulse, that is an interval of time, when the atomizer is opened to provide richer or poorer fuel mix.

Air passes through the air filter, a measuring instrument of a stream of air and throttle заслонку to inlet channels of cylinders. The gauge of a stream of air represents the tape conductor which is energised (1), fig. the Arrangement of a tape conductor (1) in a measuring instrument of a stream of air see. The constant temperature of a tape is supported by an electric current which changes depending on weight of passing air. The current which is necessary for submitting for maintenance of constant temperature of a tape, is proportional to weight of a stream of air. On the basis of the information from a measuring instrument of a stream of air and other gauges the management block regulates time and quantity of injected fuel according to the measured quantity of air and number of turns of the engine. The the atomizer is longer open, the more fuel is injected.

Additional gauges hand over the information to the management block about temperature of a cooling liquid, temperature of air arriving in the engine, and on models with the catalyst about the oxygen maintenance in exhaust gases.

The filter of the activated coal interferes with that harmful steams of fuel got from a fuel tank into atmosphere. Fuel steams collect in capacity with the activated coal and at engine work дожигаются in engine cylinders.

The memory in the management block distinguishes the appeared malfunction and writes down it. At failure of the important gauge the management block is switched to the emergency program that the engine continued to work, though and with smaller efficiency.