TAILIEUCHUNG - Automotive Computer Controlled Systems P2

Engine management systems are designed to ensure that the vehicle complies with emissions regulations as well as to provide improved performance. This means that the number of sensors and actuators is considerably greater than for a simple fuelling or ignition system. | Engine management systems EMS 17 is required for sequential injection the engine is often fitted with an additional sensor which is driven by the engine camshaft. Hall type sensors and variable reluctance sensors driven by the camshaft are often used for this purpose to assist the computer to determine TDC on number 1 cylinder. Figure shows one of these sensors which is fitted to an overhead camshaft engine. 1 CID 2 Retaining screw 3 Inlet camshaft 4 Reference lobe Fig. A cylinder identification sensor Some of the sensors used for fuelling are the same as those used for ignition systems . crank speed and top dead center sensors manifold pressure to indicate engine load etc. Because some of the sensor signals can be used for both ignition and fuelling it has become common practice to place them under the control of a single computer and the resulting system is known as an engine management system. Engine management systems EMS Engine management systems are designed to ensure that the vehicle complies with emissions regulations as well as to provide improved performance. This means that the number of sensors and actuators is considerably greater than for a simple fuelling or ignition system. The system shown in Fig. is fairly typical of modern engine management systems and selected items of technology are now given closer attention. The aim here is to concentrate on the aspects of engine control that were not covered in the sections on fuel and ignition systems. The first component to note is the oxygen sensor at number 20. This is a heated sensor HEGO and the purpose of the heating element is to bring the sensor to its working temperature as quickly as possible. The HEGO provides a feedback signal that enables the ECM to control the fuelling so that the air-fuel ratio is 18 Common technology kept very close to the chemically correct value where lambda 1 since this is the value that enables the catalytic converter to function at its best. Oxygen

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