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Reply With QuoteHow do you look for RPM?Originally Posted by 0l33l
Car starters while cranking look for engine RPM. If the RPM stay at a cerain range then it lets go of cranking.
How do you look for RPM?
I don't think (or I hope at at least), he meant the starter actually measured the RPM, since it can't. What perhaps he meant was the fact once the engine starts going by itself, the flywheel spins faster than the starter's pinion (the thing which engages the flywheel and cranks the engine), and since the pinion is a free-spinning device, the starter no longer actually keeps up with the engine.
With that said, you have a few choices at hand. Firstly, most car starters use a timed method. In other words, they don't shut themselves off when they figure out the engine is running, instead, it's timed for say 2 seconds, or 1 second, or what not--which is fine for fuel-injected systems. Some carbeurated systems require longer engages.
Secondly, for the few car starters which actually figure out once the engine is running, they can be hooked up through the ECU, or through a hot-wire which comes through the firewall. I forgot the name of the wire, but some (not all) cars have a line which goes high once the engine is running by itself.
So, with that in mind, you could do it via an onboard carputer, or through a basic electrical circuit. The onboard computer you'd setup to start itself up, just like was previously said, with one of the spare 12v lines engaging the starter's solenoid wire--PROVIDED the PSU on the computer provides ample power to the solenoid without causing a strain on the PSU.
Or, you could go with another popular method, build (or you can even buy) a basic timed circuit which throws a relay, and it all runs off of 12v which is native to your car. This is about a $20 option, and wouldn't rely on a computer.
That makes sence but if its always pulsing its gonna keep trying to start the van...(or keep trying to make the remote start the van
ALSO the remote starter is stand alone i have to hold down both buttons to start the van, im sure i can look at my spare remote and make it a one wire trigger
I'm also assuming that this cannot be done without the aid of a computer. I was hoping so a small battery run curcuitboard set with a digital watch alarm could trigger a 4.5 volt (or whatever my alarm remote ran on) charge.. but unfortunatly im not an electronics major was hoping someone here might know how to ?
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you just want a battery alarm clock, take the wire that feed the beeper and use it to power the spare remote starter keyfob?
remember,
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An alarm clock does not beep once, that would be easy to do, I think something like 555 chip will need to be interfaced to it to trigger once on first beep and ignore the rest/repeated beeps till it is reset by the driver. too bad I don't know how to build this stuff.
Or may be some elaborate relay hookup could do it.
I did something very similar to what your doing as a Joke / P.O.C. I got a second remote used a serial port grounded the 2 buttons that i have to push to do remote start. put a little script in M$ schduled task to short 2 pins on the serial cable to ground and it worked. Had problems getting my computer out of hibernation to do it. but it works.
There are couple options to monitor the engine status by the Remote starter unit. I don't know what about other but my add on Viper Remote starter does. It can monitor the voltage or RPM signal. I found that voltage is UN reliable so I had to use RPM signal. On Toyota car (My Supra), the signal can be found by the grey Diagnostic block IG is the signal.
The signal is (-) and NOT ground or the car chasic.
If the remote starter detect this signal, it doesn't crank again.
The constant to pulse circuit only send 1 pulse when the relay get hot. You don't have to worry about keep starting the car.
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No actually what he meant was a remote starter measures RPMs. Good quality remote start units have a Tach wire which is tied into the coil or the coil pack at the spark plug depending on the vehicle. He didn't mean the vehicle's starter.
Glad someone knows how starters work
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