Part of Lesson Plan: Fuel Injectors (Animation) (updated) by John Potter

Activity Overview / Details

As I play the simultaneous video clip on the overhead, I ask the students, "Is it simultaneous, or sequential?" Then I play Simultaneous 2, which gives the answer Simultaneous. 

I then ask, "Can it be mechanical, electrical, or both?" Answer: All three. I give examples (VW or L Jetronic) which is Mechanical. Early Fuel Management System which is Electrical. Late model cars use Computers.

I then play the video Sequential 1 asking the question, "Is it simultaneous or sequential?" I then play sequential 2 which has the answer.

I ask the students which system is on late model cars. After the students give their reply, I answer, "Both."

For starting the car when cold the computer turns on all injectors for a rich mixture. Then it goes into closed loop and runs sequential for better gas mileage and best performance when road conditions, temperature, air pressure and volume.etc. Then it goes back into simultaneous mode for power or heavy load. Example: pulling a grade. At this time I pass out some of the injection systems and related parts.  We will have an open discussion on until six minutes before the end of class.