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The paper describes the second generation of Bosch single point injection systems. It is a low cost system and specifically designed for closed loop control. The system uses a fuel pressure of 1 bar (14.5 psi) and will apply throttle angle/engine speed control. This type of control was already used in the very beginning of the fuel injection era but is now updated by closed loop and adaptive memory control. The throttle body, completely new designed as a module for most installation requirements, as well as characteristics of other new components such as ball type injector, throttle valve potentiometer and electric fuel pump will be described. Realized functions will be shown and test results on engines and cars will be given.

A new mass air flow meter, using a sensor element based on micro silicon technology, is presented. The sensor is able to detect the amount and direction of air flow. It is located in an aerodynamic bypass, which acts as a nonlinear filter. This enables the mass air flow meter to correctly determine the air mass aspirated by a four cylinder engine, even in the case where, due to strong oscillations of the flow, timewise backflow occurs near the measuring position. Results of laboratory and engine tests will be presented.