Map ignition

Zündrechner Ford Fiesta XR2 1985 (ESC-1, e lectronic s park c ontrol )

The map ignition adjusts the ignition point based on the following control variables :

• load
• rotational speed
• Temperature of the intake air (optional, such as engine temperature)
• Knock sensor (optional)

To always determine the optimum ignition timing, the electronic engine control accesses determined by the manufacturer maps back. The maps are stored digitally on the ROM , EPROM or in modern ignition systems on an EEPROM . The manufacturer optimizes the ignition map for performance, consumption and exhaust emissions (spec. NO _x ). In addition to the 2-dimensional main map (parameters: speed and load), there can optionally also be auxiliary fields (e.g. for engine emergency operation).

With chip tuning , these maps are usually changed in such a way that the ignition point is earlier, which means that a higher total pressure is exerted on the piston.

literature

• Jürgen Kasedorf: Motor vehicle engine test. Petrol engines. 7th revised edition. Vogel Buchverlag, Würzburg 1997, ISBN 3-8023-0461-6 .
• Peter Gerigk, Detlev Bruhn, Dietmar Danner: Automotive engineering. 3rd edition, 4th printing. Westermann Schulbuchverlag GmbH, Braunschweig 2000, ISBN 3-14-221500-X .