josey Posted November 17, 2014 Report Share Posted November 17, 2014 Hi guys, i searched but didnt find, is there way to control alternator with v88? alternator need pwm signal to maintain desired system voltage of course load should make no difference in system voltage. Something could be done over GP PWM output with gp output table, but than depending on system power load, voltage would fluctuate. do you have any suggestions how to solve this now? I have idea, but I do not know whether is it doable, i know it requires programing, something like - alternator close loop control (for examle) Operating freq: 250hz min load: 10% max load: 90% desired voltage:13.8v one table with reference numbers like closed loop idle control 800rpm ---- 2000rpm ---- 3000rpm ---- 4000 ---- 5000 ---- .... 50% dc -------48% -----------43%----------38%-------31%------.... btw, i entered ECU serial no but still cant post except here. Please can you fix that, and move topic to v88 support thanks Quote Link to comment Share on other sites More sharing options...
Simon Posted November 18, 2014 Report Share Posted November 18, 2014 Hi You could set a GP PWM table up using Battery voltage and RPM as your axis. It would then just be figuring out the required frequency and duty cycle required for the application. Quote Link to comment Share on other sites More sharing options...
bsh Posted November 24, 2014 Report Share Posted November 24, 2014 I did a Ford Fiesta ST150 once. I believe it had something like 128hz, and lowering the duty cycle, increased voltage. If I remember correctly, 40% was about 14.0 Volt. Quote Link to comment Share on other sites More sharing options...
josey Posted November 27, 2014 Author Report Share Posted November 27, 2014 thanks for reply guys and actually i have turbocharged ST150 my idea was to setup gp output with rpm on x axis and batt voltage on y but i think that want work. car is running with 40A (fuel pumps, cop, injectors) what when i get lights on its about 12-15A more heating AC window heaters ... i think that is impossible to compensate system voltage this way, but i will try. 2 bsh is it possible for you to get that pwm table? thanks Quote Link to comment Share on other sites More sharing options...
josey Posted December 17, 2014 Author Report Share Posted December 17, 2014 it seems that ECU controlled alternators (at least ford alternators) are IAT (or even external air temp sensor) and ECT dependent. can anyone confirm this? what about other manufacturers, toyota, nisan, audi ... ? thnx guys Quote Link to comment Share on other sites More sharing options...
Dave Kriedeman Posted December 17, 2014 Report Share Posted December 17, 2014 Hi Josey, I have never personally worked with one. Do you have a schematic diagram of the charge circuit you can post up, please. Regards Dave. Quote Link to comment Share on other sites More sharing options...
josey Posted December 17, 2014 Author Report Share Posted December 17, 2014 i do but its no use b+ to battery charging pin 3 to battery for reference voltage pin 2 from ecu pwm pin 1 feedback to ecu square pwm i ve search alot and i think ive figuire it out, but i dont have 100% confirmed data, i have to test and confirm all this. edit image cant fit link: http://i.imgur.com/9Mjnwc4.jpg and what i found http://www.fordownersclub.com/forums/to ... /?p=135566 Quote Link to comment Share on other sites More sharing options...
Dave Kriedeman Posted December 18, 2014 Report Share Posted December 18, 2014 Hi Josey, due to my lack of experience with this type of alternator I will need Simon's input. I will get him to respond ASAP. The image of the schematic diagram is illegible I can't see it properly sorry. However the forum link info is of more use I believe. Regards Dave. Quote Link to comment Share on other sites More sharing options...
josey Posted December 18, 2014 Author Report Share Posted December 18, 2014 pls can you send me your email over pm thanks Quote Link to comment Share on other sites More sharing options...
Simon Posted December 19, 2014 Report Share Posted December 19, 2014 Hi Unfortunately I really don't know what the required duty cycle would be. We don't have any system to use the feed back from the alternator to effect the charge current. All you can really do is base the control off the voltage we see at the ECU. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.