Verfahren und Vorrichtung zum Steuern der Fahrzeuggeschwindigkeit zur Glättung des Schaltvorgangs für Fahrzeuge mit automatischem Getriebe.

摘要

To prevent gear shift shock in a vehicle power train associated with a turbocharged engine (10) and an automatic transmission (12), an air charging efficiency for engine cylinders is reduced during the gear shifting transient period, e.g., when shifting from first gear range to a higher second gear range. Therefore, when engine output is reduced by means of retardation of ignition timing at the time of gear shifting, no misfire occurs due to prevention of internal pressure increase in any engine cylinder. Thus, shift shock can be prevented with the smooth reduction of engine output and air charging efficiency is smoothly recovered after completion of the gear shift transient period.