How to modulate the output of automotive injectors?

  • Thread starter FarmerTony
  • Start date
  • #1

Main Question or Discussion Point

Using automotive injectors for a project. I would like to know if the signal to cause injector operation is -

1. PWM 12V, i.e. one off operation
2. Voltage modulation, i.e. the voltage applied controls the output rate.
3. Current modulation
4. Something else. If so what?

Tried an automotive forum, but all I got was "what do you think" troll responses. Looking for real information.
 

Answers and Replies

  • #2
jrmichler
Science Advisor
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912
Your #1 is correct. Automotive fuel injectors open once per combustion cycle, and they need to open fast and close fast. The flow rate is determined by injector size and fuel pressure.
 
  • #3
779
526
The systems I'm aware of are PWM.

Found this article interesting, although it doesn't go very far into the electrical side of injector control.
 
  • #4
Hmm, interesting. Now to work on the electronics part, thanks :D
 

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