Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Electronic Fuel Injection Help Needed

  1. Feb 11, 2005 #1
    I am currently in first year engineering. I am doing a project on electronic fuel injection. The project requires as much physics incorporation as possible.

    I am just wondering if there is anybody who has some advise or ideas for me as far as "the physics of electronic fuel injection."

    Thank you
  2. jcsd
  3. Feb 11, 2005 #2


    User Avatar
    Science Advisor
    Gold Member

    Right, but we don't know what is the purpose of your project. Are you focused on the electronic part (commanding the injection)?. Otherwise, are you focused in the proper process of injection (atomization, mixing, etc?). Is it for a Diesel or for a spark ignition engine?

    You should take a look at a heat engines book. I strongly recommend you the book of Heywood "Internal Combustion Engines Fundamentals". A strong knowledge about combustion in internal engines is needed in order to understand how the electronic system governs the event of injection. There are fuel to air ratio laws derived for spark ignition engines which ensure the maximum power and the minimum consumption of fuel, which are the two principal functioning modes of the injection. If you want to know more about combustion in this devices, post here your doubts or search for a book or tutorial. As far as electronics are concerned, I only know how the system is governed externally. I only can help you with external sensors.
  4. Feb 11, 2005 #3


    User Avatar
    Science Advisor
    Gold Member

    ....I can help you with atomisation!
  5. Feb 11, 2005 #4


    User Avatar
    Science Advisor

    Yes, as far as atomization goes. I have some limited knowledge on this. I do know that oil refineries (such as the one im co-oping at right now) blend their fuels to be a little lighter in the wintertime. Lighter as in more lighter hydrocarbons, C5s, C6s, etc. Supposedly, this is to help atomization due to the cold weather. Then, when it starts getting warmer, they go back to the heavier blend.
  6. Feb 11, 2005 #5


    User Avatar
    Staff Emeritus
    Science Advisor

    The objective of fuel injection is to obtain a much better - fuel/air (oxidizer) mixture - in order to maximize combustion efficiency.

    There is the physics of the injector nozzle and the fuel/air flow fields (fluid dynamics), and the physics (chemistry/thermodynamics) of combustion.

    Then there is the electronic control system - solid-state digital microprocessor, sensors and actuators - which controls flow rate and pressure of fuel in conjunction with flow rate, temperature and pressure of the air.
    Last edited: Feb 11, 2005
  7. Feb 11, 2005 #6
    Thanks everybody. These points give me a basis to begin my research. If I incounter any specific problems I will be sure to post them here.

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook