Download e-book for kindle: Automotive Computer Controlled Systems (Automobile by Allan W. M. Bonnick

By Allan W. M. Bonnick

ISBN-10: 0750650893

ISBN-13: 9780750650892

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Extra info for Automotive Computer Controlled Systems (Automobile Electronics Referex Engineering)

Example text

Because the compressor takes a considerable amount of power from the engine it is necessary for the air conditioning computer to be aware of the operational state of the engine. For example, the idling speed of the engine will be affected if the air conditioning compressor is operating, and the engine ECM will normally cause an increase in idle speed to prevent the engine from stalling. To allow the air conditioning compressor to be taken in and out of operation it is driven through an electromagnetic clutch which is shown in Fig.

In the case here, of spin at the FR wheel, the controlling action takes place by opening and closing the inlet valve (C4) and the outlet valve (D4). When the computer detects that wheel spin has ceased and normal drive is taking place, the modulator pump is switched off, the solenoid valves (2) open and the valves (C4) and (D4) return to their positions for normal brake operation. Because the modulator pump is designed to provide more brake fluid than is normally required for operation of the brakes, the by-pass valves (3) are designed to open at a certain pressure so that excess brake fluid can be released back through the master cylinder to the brake fluid reservoir.

They are similar to an old fashioned gramophone record in that they have grooves which are deeper in some places than they are in others. The depth of the groove is read by a laser Adaptive operating strategy of the ECM 51 beam that is connected to an electronic circuit and this circuit converts the laser readings into voltages that represent the 0s and 1s used by the computer. 8 Fault codes When a microcontroller (computer) is controlling the operation of an automotive system, such as engine management, it is constantly taking readings from a range of sensors.

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Automotive Computer Controlled Systems (Automobile Electronics Referex Engineering) by Allan W. M. Bonnick

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