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An electronic control of throttle angle is required for safety systems like traction control (ASR) and for advanced engine management systems with regard to further improvements of driving comfort and fuel economy. For applications, in which only ASR is required, two versions of a new traction control actuator (TCA) have been developed. Their function is based on controlling the effective length of the bowden cable between the accelerator pedal and the throttle. Besides retaining the mechanical linkage to the throttle, the concept has no need for a pedal position sensor, which is necessary for a drive-by-wire system. Design and performance of both actuators are described and their individual advantages are compared. Moreover, the communication of the system with ASR and its behaviour with regard to vehicle dynamics are illustrated.

After a brief explanation of the K-Jetronic injection system, there follows the description of the KE-Jetronic which represents the combination of a basic mechanical installation and the electronic control of additional functions. Special emphasis is placed on the new components such as the air-flow sensor, the electro-hydraulic actuator, the pressure regulator and the electronic control unit. Test results show the improvement in fuel economy and in emissions.