Monomotronic and KE-Motronic
Mechanical and vacuum ignition adjustment ensures optimum combustion of the working mixture only within narrow limits. With the capabilities of electronics, it is possible to achieve a more precise and optimum setting of the ignition timing. This reduces fuel consumption and reduces the content of harmful impurities in the exhaust gases. The electronics of the control unit selects the most precise ignition timing. This is done in accordance with the programmed values, which are stored in the memory of the control unit as a data array. Thus, the control unit performs the following functions:
The ignition timing adjustment, depending on the engine speed and load, is no longer performed in the distributor. The distributor has no vacuum chamber, and the distributor shaft is manufactured as a single unit. The recesses in the distributor rotor blend are arranged so that the ignition pulse can be sent to 60° before TDC. In a given range (up to 60°), the control unit processes the information about the engine speed (by the sequence and frequency of ignition pulses) and about the throttle position (by the resistance value of the throttle potentiometer) and determines the optimal ignition timing.
There are correction programs for operation in engine starting, warming up, coasting, etc. modes.
Knock control is possible, which is always carried out in engines equipped with the KE-Motronic system using the maximum possible ignition advance, which corresponds to the best power output.
Finally, we note that there is data exchange with the injection system. For this reason, some sensors are used twice.
The original article is posted on the resource AUDIMANUAL.ru