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PWM output bench testing

 
Old 02-04-2010, 06:02 PM
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Default PWM output bench testing

I have a quick question. Is it possible to get one of the PWM outputs to fire on the bench top, just feeding power to the Adaptronic? For example, can I just feed it power, and change the PWM output for a set duty cycle at 0 RPM? I want to use it to test trigger a solenoid, changing PWM frequency and duty cycle, but do not want to have to build a stimulator circuit to simulate the engine sensor input triggers.

This is my evil plan...
https://www.miataturbo.net/forum/t43475-3/#post517984

I posted this question up on the Adaptronic site as well.
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Old 02-05-2010, 12:17 PM
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Nick at the Adaptronic forum (forum admin and adaptronic employee judging by his e-mail address) thinks that it might work. Anyone else try this, or have thoughts? Travis?

Thanks in advance.
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Old 02-09-2010, 11:48 PM
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You could make your reference air temp or something that is non-zero when the car isn't running, then you wouldn't have to worry about it being at 0 rpm.
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Old 02-10-2010, 12:16 AM
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cant you have a boost dependant trigger? if nothing else a standalone boost switch is only 14 bucks or so. This would ensure that you dont spray before you want to.
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Old 02-10-2010, 08:58 AM
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Yep I already have two of those switches from the last setup. I'll probably set one of them to turn the pump on at something like 3-5 psi, then start activating the PWM at some TBD value above that.
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Old 02-10-2010, 10:52 AM
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You no likee the software-based VR wheel simulator?

Me sad panda.
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Old 02-10-2010, 05:35 PM
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Originally Posted by ZX-Tex View Post
Nick at the Adaptronic forum (forum admin and adaptronic employee judging by his e-mail address) thinks that it might work. Anyone else try this, or have thoughts? Travis?

Thanks in advance.
Sorry I've been snowed under for a couple days. The easiest way would be to power the adaptronic and switch the PWM to external. Get yourself a semi welldefined potentiometer hook it upto the external input and you can set the upper and lower limits in the field under a PWM input. So if you set the top value at 5, the until will produce 100% dutycycle at 5 volts which is linear in percent dutycycle all the way to zero. Its a little indirect, but the problem is the output has to be based on some variable. You can't just tell something turn on without using another variable, and I think thats the easiest way to get at it.
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Old 02-10-2010, 08:46 PM
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Originally Posted by Joe Perez View Post
You no likee the software-based VR wheel simulator?

Me sad panda.
No if you mean the switches, I was thinking of that for the final installation. The sad panda does not have to be banished to the Island of Misfit Mascots.
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Old 02-10-2010, 08:47 PM
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Originally Posted by TravisR View Post
Sorry I've been snowed under for a couple days. The easiest way would be to power the adaptronic and switch the PWM to external. Get yourself a semi welldefined potentiometer hook it upto the external input and you can set the upper and lower limits in the field under a PWM input. So if you set the top value at 5, the until will produce 100% dutycycle at 5 volts which is linear in percent dutycycle all the way to zero. Its a little indirect, but the problem is the output has to be based on some variable. You can't just tell something turn on without using another variable, and I think thats the easiest way to get at it.
Another good idea. I'll get something put together soon and report back. I might have to work this weekend so forgive me in advance if it takes awhile to get some results posted.
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