The combustion and performance of a converted direct injection compressed natural gas engine using spark plug fuel injector

Taib Iskandar Mohamad, Ali Yusoff, Shahrir Abdullah, Mark Jermy, Matthew Harrison, How Heoy Geok

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Citations (Scopus)

Abstract

Compressed natural gas (CNG) has been widely used as alternatives to gasoline and diesel in automotive engines. It is a very promising alternative fuel due to many reasons including adaptability to those engines, low in cost, and low emission levels. Unfortunately, when converting to CNG, engines usually suffer from reduced power and limited engine speed. These are due to volumetric loss and slower flame speed. Direct injection (DI) can mitigate these problems by injecting CNG after the intake valve closes, thus increasing volumetric efficiency. In addition, the high pressure gas jet can enhance the turbulence in the cylinder which is beneficial to the mixing and burning. However, conversion to direct fuel injection (DFI) requires a costly modification to the cylinder head to accommodate the direct injector and also can involve piston crown adjustment. This paper discusses a new alternative to converting to DFI using a device called Spark Plug Fuel Injector (SPFI). It is a combination of a fuel injector and a spark plug which fits into the engine block through the existing spark plug hole. With SPFI, conversion to DFI is simple, cheap and requires no modification to the original structure of the engine, except minor calibration to the ECU. The SPFI was installed on a 0.5 liter single cylinder engine and run at 1100 rpm, WOT and stoichiometric air-fuel ratio. Results showed that engine running with SPFI gained the advantage of significant increased volumetric efficiency, faster burning rate, higher output power and improved fuel conversion efficiency compared to port injection operation in the expense of reduced effective compression ratio.

Original languageEnglish
Title of host publicationSAE Technical Papers
DOIs
Publication statusPublished - 2010

Fingerprint

Compressed natural gas
Spark plugs
Gas engines
Direct injection
Engines
Fuel injection
Engine cylinders
Intake valves
Cylinder heads
Alternative fuels
Pistons
Conversion efficiency
Gasoline
Turbulence
Calibration
Air
Gases

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

Cite this

The combustion and performance of a converted direct injection compressed natural gas engine using spark plug fuel injector. / Mohamad, Taib Iskandar; Yusoff, Ali; Abdullah, Shahrir; Jermy, Mark; Harrison, Matthew; Geok, How Heoy.

SAE Technical Papers. 2010.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Mohamad, Taib Iskandar ; Yusoff, Ali ; Abdullah, Shahrir ; Jermy, Mark ; Harrison, Matthew ; Geok, How Heoy. / The combustion and performance of a converted direct injection compressed natural gas engine using spark plug fuel injector. SAE Technical Papers. 2010.
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