Anyone any experience of this?
I'd like to automate a car engine (petrol) driven air compressor, the engine has an ecu which controlls the injectors and ignition (from the original donor car).
I was thinking of just closing a relay for the ignition (wired into where the ignition switch was on the loom) then close another relay to bring in the starter, then measure the battery voltage with an a to d on a pic, when the engine fires the battery voltage rises by a quite a bit due to the releived load on the starter, and when this happens release the starter relay as the engine has started.
The battery voltage drops to around 6 or 7 while while the engine cranks, then comes up to around 10 when the engine fires (before the alty kicks in).
And I'd have to include a timer so the starter doesnt remain on too long, and on top of that maybe a number of tries counter resulting in an alarm if the engine wont go.
I'd like to automate a car engine (petrol) driven air compressor, the engine has an ecu which controlls the injectors and ignition (from the original donor car).
I was thinking of just closing a relay for the ignition (wired into where the ignition switch was on the loom) then close another relay to bring in the starter, then measure the battery voltage with an a to d on a pic, when the engine fires the battery voltage rises by a quite a bit due to the releived load on the starter, and when this happens release the starter relay as the engine has started.
The battery voltage drops to around 6 or 7 while while the engine cranks, then comes up to around 10 when the engine fires (before the alty kicks in).
And I'd have to include a timer so the starter doesnt remain on too long, and on top of that maybe a number of tries counter resulting in an alarm if the engine wont go.
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