![]() ![]() I may have to tweak these values slightly, but I think it’s a good starting point. My plan is to set it up where it will output 14.5V when the engine is cold, and taper down to 13.8V when the engine is warmed up. So I think the Microsquirt will control this alternator quite well. At 34%, the voltage was 14V, and at 42%, the voltage was 14.5V. At 30% duty cycle, the output voltage was 13.8V. The output voltage seems to be directly related to the duty cycle. He suggested setting the frequency at 90Hz, so that’s what we used for testing. My electrical engineer friend said that if we increased the frequency too much, the alternator would quit charging (something about “overlapping” that screws with the duty cycle). As we changed the frequency of the PWM signal, the output voltage didn’t really change. The output voltage is not dependent on the frequency, but varies with duty cycle. Without the PWM signal, the alternator will not charge at all. The alternator must have a PWM signal on the GEN-COM wire (blue wire going to the alternator). Most of the info we found on the web about this alternator was not exactly accurate. ![]() We experimented with the Ford Focus alternator on the workbench, using a pulse generator, and were successful in getting it to work. I'll start with what he had to say, then see if I can translate this into MS3 output info. He was using a MicroSquirt's PWM idle output, but i have posted this in the MS3 forum because of the MS3's dedicated alternator control function. This customer did some testing on these alternators, and gave me permission to post what he found here for the benefit of others. There is also a signal called GEN-MON that is used to monitor electrical load, but you can run without it. These take a signal referred to as GEN-COM in Ford documentation, which gives a PWM signal that commands the alternator voltage. I have a customer who has been working with the ECU controlled alternators on Zetec Focuses. I am also interested in alt control, I found this post that Matt Cramer at DIY Autotune Postedįord "Smart Charge" alternator testing results. ![]()
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