push button start feature

Thought Of A Good Feature To Add Tell Everyone About It Here
Post Reply
User avatar
jenko
Posts: 450
Joined: Wed Jan 29, 2014 3:43 pm
cars: hilux v6
jaguar v12
mitsubishi lancer
fj cruiser
sv 21 camry wagon
Location: Pine mountain .vic
Contact:

push button start feature

Post by jenko »

could some of the outputs be used to turn of starter when engine starts
User avatar
VL400
Posts: 4991
Joined: Sun Mar 01, 2009 2:54 pm
cars: VL Calais and Toyota Landcruiser. Plus some toys :)
Location: Perth, WA
Contact:

Re: push button start feature

Post by VL400 »

In 12P yes you could use a flex output that is only active below a certain RPM - or use the flag to enable an output only during engine run and use the output invert option (basically becomes active only when the engine is not running then).
User avatar
antus
Site Admin
Posts: 8237
Joined: Sat Feb 28, 2009 8:34 pm
cars: TX Gemini 2L Twincam
TX Gemini SR20 18psi
Datsun 1200 Ute
Subaru Blitzen '06 EZ30 4th gen, 3.0R Spec B
Contact:

Re: push button start feature

Post by antus »

The later holdens that have computer controlled starter have a timer that will abort the start to control runaway cars. Worth having some similar logic. Probably a 3d table of rpm vs runtime if it counts while cranking so it disables the starter after 5 seconds. Or just have start button on a relay so it disengages when you lift your finger.
Have you read the FAQ? For lots of information and links to significant threads see here: http://pcmhacking.net/forums/viewtopic.php?f=7&t=1396
User avatar
jenko
Posts: 450
Joined: Wed Jan 29, 2014 3:43 pm
cars: hilux v6
jaguar v12
mitsubishi lancer
fj cruiser
sv 21 camry wagon
Location: Pine mountain .vic
Contact:

Re: push button start feature

Post by jenko »

have tried with kalmaker using ac output but couldn't get it to work as kalmaker wouldnt let me have enough control
User avatar
antus
Site Admin
Posts: 8237
Joined: Sat Feb 28, 2009 8:34 pm
cars: TX Gemini 2L Twincam
TX Gemini SR20 18psi
Datsun 1200 Ute
Subaru Blitzen '06 EZ30 4th gen, 3.0R Spec B
Contact:

Re: push button start feature

Post by antus »

Is there a reason you need computer control on it? On my track car I just press and hold the start button then lift my finger when it fires. Its simple, and unlikely to fail and keep the starter engaged unintentionally.
Have you read the FAQ? For lots of information and links to significant threads see here: http://pcmhacking.net/forums/viewtopic.php?f=7&t=1396
User avatar
Holden202T
Posts: 10311
Joined: Sat Feb 28, 2009 9:05 pm
Location: Tenambit, NSW
Contact:

Re: push button start feature

Post by Holden202T »

yeah I use the same on mine, all I did was ran the starter through a relay and the push buttons activates the relay, only so it wasn't putting heaps of load through the button.
User avatar
jenko
Posts: 450
Joined: Wed Jan 29, 2014 3:43 pm
cars: hilux v6
jaguar v12
mitsubishi lancer
fj cruiser
sv 21 camry wagon
Location: Pine mountain .vic
Contact:

Re: push button start feature

Post by jenko »

I want to be able to have a push button that stays in. so push the button, it turns on ignition and activates starter .Then ecu turns off starter when engine running, and push button again to turn off ignition
User avatar
Holden202T
Posts: 10311
Joined: Sat Feb 28, 2009 9:05 pm
Location: Tenambit, NSW
Contact:

Re: push button start feature

Post by Holden202T »

I think your going to need a few more smarts behind it to do that!
User avatar
VL400
Posts: 4991
Joined: Sun Mar 01, 2009 2:54 pm
cars: VL Calais and Toyota Landcruiser. Plus some toys :)
Location: Perth, WA
Contact:

Re: push button start feature

Post by VL400 »

A standard feature that was removed in 12P would have been very handy in this case! The original code included a cranking timer that was never used for anything, could have mapped it against RPM to use it to engage the starter, but disable it after X time or when engine is running.

This was re-purposed as recording the analog input (the wire that is connected to the starter circuit on V6s), there is very limited RAM so the same byte that was a timer became the analog/digital reading. Can possibly add this back in with some code changes where if the backfire inhibit mode is enabled it stores the cranking time instead of the analog reading.

This keeps the original cranking input available as an analog input on V8s without wasted spark.

EDIT: Scrap all that. You will need more logic to get it to work properly with a timeout. Using the above it will crank, stop after X time, then start cranking again shortly after. Maybe use a 555 timer as a one shot driving the high side of a relay, triggered to start via the push button. And then use a flex output so its active below say 400RPM to provide the ground for the relay.
VK_3800
Posts: 526
Joined: Sun Jul 04, 2010 3:15 pm
cars: SS Torana
Location: NZ

Re: push button start feature

Post by VK_3800 »

Some of the old cars used to start by hitting the accelerator once the ignition was switched on, that would be cool
Post Reply