nah just wondering if you could get some diagrams of how you would set it up Joe ;) hehehe, that will be my my next move after i get all the turbo stuff worked out ;)
|
Originally Posted by Joe Perez
(Post 142078)
More about Lazzer & I debating the finer points of digital modulation theory? :gay:
I'm the master of PWM. What do you need? I can draw up something. Motor control? Solinoid control? Oh! Which reminds me... I found the perfect little solinoid valve for the junkyard do-it-yourself'er. You can find on a Chevy Lumina van that has the airpump built in for filling tires. Open the rear cargo door and check the left rear compartment behind the controll panel for the pump. There's a spiffy little high pressure solinoid back there. :bigtu: I'll post a pic. I think 10hz would be more then enough. Put the solinoid in the trunk and the line to the intake will 'buffer' the pulsation. |
Originally Posted by lazzer408
(Post 142305)
Motor control? Solinoid control?
The only way I'd call a fuel-injector driver a PWM circuit would be in a peak-hold application, and only if the "hold" condition was achieved by high-speed switching of the driver, rather than with a resistor. And what the heck is a solinoid, anyway... :gay: |
"solenoid" :vash:
Whos wrong? I'm wrong? Read up on PWM. Fuel injectors are driven with a PWM signal. The width is proportionate to...? Engine load? |
once again Lazzer talks out his ass
Lazzer, I'll agree with you that the concept between fuel injector driver and pulse width modulation are similar. However, the applications are completely different. PWM is a method digital regulation to achieve "analog-like" results. Most common application is voltage control (dimmer or motor speed control). A fuel injector is simply turning on and off. |
Originally Posted by lazzer408
(Post 142305)
I'm the master of PWM. What do you need? I can draw up something. Motor control? Solinoid control?
The device needs to begin at 50% duty cycle, ramp up over 3 seconds, then remove itself from the fan circuit. No fan shut off regulation required. |
God damn lazzer why cant you play nice for a fucking minute without pissing everyone off?
Sweet shit man you dont know everything. ANd the stuff you know is probably wrong. |
Do you consider .0001ohm of a mosfet "removed" or do you need a bypass relay to activate once 100% is reached? The program I use to draw schematics doesn't have any pwm driver IC models. One I use is the 3525. There are a few ways to do this. If you want exactly 3 seconds you'll need a pic processor otherwise I'll go with an RC network similer to a throttle ramp in motor control. Will that be enough for you?
|
Why is it always Ben and Loki that challange me? I don't understand why you guys get pissed off when I try to help someone understand something.
|
1 Attachment(s)
http://i196.photobucket.com/albums/a...h_MVC-002W.jpg
Back when I was screwing around designing a speed control for my EV I wondered how well the circuit would work for audio as a "class-d" amplifier. In the video it's just one mosfet being used LC coupled to the speaker. The scope is showing the signal at the speaker and is far from ideal. I wasn't building an amplifier after all. I was building a speed control for a 144vdc series wound motor. Attachment 216004 There's the switching side of the fan controller. Ignore the stator winding. That's the only motor model I have. I guess I can use a dual op-amp for osc and pwm. bbl |
Sounds like your after the same system i'm running.
I've got the DO base system, running to a Aquamist HSV that i'm controlling via the sub I/J map. Been running this system for a while now, nothing but praise for it. The beauty of this system is you can control the HSV and water level by 0.5% DC. Here's 1 of my sub I/J maps i was running as an example: http://i32.photobucket.com/albums/d4...lip0001-24.jpg Cheers Mark |
I want the ramp up circuit completely removed from the fan's current path in all ways, once the ramp event is concluded. 3 seconds was a number I pulled out of my ass. It doesn't have to be exact, nor does it have to be exactly regulated.
I also forgot to mention, the parts need to be cheap, and the circuit easy for a novice to build. I have one in mind; I'd be interested to see what you can come up with. And I can't see you schooling Mr. Joe Perez, Ph.D on circuit theory. |
1 Attachment(s)
Attachment 216002
When the switch is closed Q1 will conduct charging C1 thru R1. The voltage on C1 will be sent to the 3525 input to begin 0-100% pwm. When the switch is opened Q2 will discharge C1 to 'reset' the timing portion of the circuit. R2 and R3 set the trip point for the comparator which will be used to activate a bypass relay. I believe the 3525 uses 0-2.5v = 0-100% so the comparator should be adjusted for >2.5v trip in order to activate after 100% pwm is obtained. I'm not going to illustrate a complete schematic or values. That involves time I'm not being paid for. If you use an opamp for your osc/pwm I suggest you use another totempole for the mosfet gate drive. |
Originally Posted by Ben
(Post 142511)
And I can't see you schooling Mr. Joe Perez, Ph.D on circuit theory.
|
Originally Posted by eunos1800
(Post 142510)
Sounds like your after the same system i'm running.
|
Those without an emu can build a pwm bassed control ran off a map sensor couldnt they?
I guess I know they could but would they want to. |
Originally Posted by lazzer408
(Post 142305)
"digital modulation theory" :gay:
I'm the master of PWM. What do you need? I can draw up something.
Originally Posted by lazzer408
(Post 142506)
The program I use to draw schematics doesn't have any pwm driver IC models.
Originally Posted by lazzer408
(Post 142305)
Oh! Which reminds me... I found the perfect little solinoid valve for the junkyard do-it-yourself'er. You can find on a Chevy Lumina van that has the airpump built in for filling tires.
...I'll post a pic.
Originally Posted by lazzer408
(Post 142507)
I don't understand why you guys get pissed off when I try to help someone understand something.
You've been schooled. |
Originally Posted by lazzer408
(Post 142546)
Those without an emu can build a pwm bassed control ran off a map sensor couldnt they?
I guess I know they could but would they want to. |
probably not enough pressure available, but theres a good idea there. Just would need a pressure transducer and a variable relay of some sort to a motor. Keep in mind im a ME and hate electronics.
|
no offense mouglie, im all for ripping on lazzer, in fact its replaced my full time job, but that was a late hit.
|
All times are GMT -4. The time now is 02:54 PM. |
© 2024 MH Sub I, LLC dba Internet Brands