Effect of the Supply of the Mixture During Injection Into the Intake Manifold

Format:

Conference/Event

Author/Creator:

Bamer, Bamer, author.

Conference Name:

20th FISITA Congress (1984), Vienna, Austria (1984-01-01 : Vienna, Austria)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1984

Summary:

Thermodynamic considerations provide a good overview of ordersof magnitude in mixture preparation. A rough calculation at 20\mDCambient temperature and with thorough mixing with air reveals thatapproximately 70% of the gasoline evaporates. Through polytropiccompression up to the point of ignition it is possible for afurther 10% of the gasoline to evaporate. The remainder of thegasoline must be evaporated by the hot intake manifold and the hotcombustion chamber. The problem is alleviated by the property ofthe hydrocarbons since the specific heat of vaporization convergestoward zero with increasing pressure and temperature.Mechanical atomization both with the K-Jetronic nozzle and theL-Jetronic valve provides most of the mixture preparation;additional air shrouding produces slight advantages in idleconsumption and greater advantages in smoothness of running in therange close to idle.Shifting the point of injection upstream and away from the inletvalve is impractical due to the necessity of accelerationenrichment.Advancing the moment of injection to before the intake stroke inthe case of sequential injection likewise improves mixturepreparation with the L-Jetronic. There are further advantages tosequential injection.Stratification in the open combustion chamber is still anunsolved problem

Notes:

Vendor supplied data

Publisher Number:

845034

Access Restriction:

Restricted for use by site license