An Emission Comparison Between a Carburetor and an Electronic Fuel Injection System for Utility Engines

911806

09/01/1991

Event
International Off-Highway & Powerplant Congress & Exposition
Authors Abstract
Content
An Electronic Fuel Injection system has been developed for utility engines which will reduce exhaust emissions and give greater control of the Air/Fuel ratio compared to the standard carburetor. Standard automotive components were used when possible.
The Electronic Fuel Injection system is a port fuel injected design using a bottom feed fuel injector which sprays directly on the intake valve. The engine speed/position, throttle position, air intake temperature and cylinder head temperature are measured and fed into the Electronic Control Unit. Look-up tables are used to determine the injection duration time during starting, warm-up, acceleration and normal operating conditions. Normal operating conditions are conditions the engine would encounter during actual use such as idle to governored rpm, no-load to full load, ambient temperature ranges from -40°C to 55°C, and any combination of the above. Corrections for engine overheating are also made, but not for a restricted air filter element. An electric fuel pump and mechanical pressure regulator were used to supply and control the fuel pressure to the fuel injector.
Meta TagsDetails
DOI
https://doi.org/10.4271/911806
Pages
13
Citation
Swanson, M., "An Emission Comparison Between a Carburetor and an Electronic Fuel Injection System for Utility Engines," SAE Technical Paper 911806, 1991, https://doi.org/10.4271/911806.
Additional Details
Publisher
Published
Sep 1, 1991
Product Code
911806
Content Type
Technical Paper
Language
English