in 1979. Essentially, it comprised the functions of electronic fuel injection and electronic ignition. With the advances made in the field of microelectronics, it has been possible to continuously expand the capabilities of Motronic systems over the course of time. The range of functions has been continuously adapted in response to prevailing demands and the complexity of successive Motronic systems has consequently increased.Although cost considerations limited application of early Motronic versions to luxuryclass cars, progressively more stringent demands for clean emissions is gradually leading to widespread use of this system. Since the mid-1990s, all new engine projects in which Bosch has been involved use Motronic systems.
Open-and closed-loop electronic controlMotronic comprises all the components which control the gasoline engine (Fig. 1). The torque requested by the driver is adjusted by means of actuators or converters. The main individual components are ¼ The electrically actuated throttle valve (air system): This controls the air-mass flow to the cylinders and thus the cylinder charge. ¼ The fuel injectors (fuel system): These meter the correct amount of fuel for the cylinder charge. ¼ The ignition coils and spark plugs (ignition system): These provide for correctly timed ignition of the air/fuel mixture in the cylinder.
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