Operating Principle

The original form of this injection system, K-Jetronic, worked purely mechanically on the principle of “more intake air – more fuel”. Simple devices such as the warm-up enrichment regulator and the cold start valve additionally provided adaptability to difficult operating conditions. Combining lambda control (with a regulated catalytic converter) with the classic K-Jetronic system without additional devices was not possible.

This was the main reason for the further development of KE-Jetronic. The basic elements of the previous system were retained and supplemented by an electronic control unit and the so-called pressure regulator – a control element with an electromagnetic actuator that additionally influences fuel metering. The pressure regulator is mainly active during engine warm-up, but it also performs the central function in regulating the mixture through lambda control (regulated catalytic converter).

Together with the fully electronic “VEZ” ignition system (described in the Ignition System chapter), this injection system forms a complete engine management system. Although each system has its own control unit, data is exchanged between them. In addition, the ignition and injection systems often use the same sensors as their source of information.

A fault memory that records faults during driving completes the electronic capabilities. The fault memory can be read to determine the cause of malfunctions.