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Forum: Engine & Drivetrain

04-13-2020, 10:37 AM

Replies: 16

Alternator voltage output/Battery charge voltage

Views: 3,880

Posted By SonicVQ

Good idea, I will. Actually I haven't checked...

Good idea, I will.
Actually I haven't checked it since it was installed just over 3 years ago.

Forum: Engine & Drivetrain

04-12-2020, 11:49 AM

Replies: 16

Alternator voltage output/Battery charge voltage

Views: 3,880

Posted By SonicVQ

It isn't the original battery, but a same...

It isn't the original battery, but a same size/capacity replacement installed in late 2016.

I agree that typical battery voltages with the engine running is 13.6 - 14.4.
However, in our case the...

Forum: Engine & Drivetrain

04-12-2020, 09:41 AM

Replies: 16

Alternator voltage output/Battery charge voltage

Views: 3,880

Posted By SonicVQ

Very interesting! With a 5 volt input, the...

Very interesting!

With a 5 volt input, the peak output voltage is about 1.3 volts lower, or 3.7volts.
This is due to the voltage drop from the schottky diode (~0.3v) and the 1.0 voltage drop from...

Forum: Engine & Drivetrain

04-11-2020, 11:34 AM

Replies: 16

Alternator voltage output/Battery charge voltage

Views: 3,880

Posted By SonicVQ

Either way, I think you are fine since the duty...

Either way, I think you are fine since the duty cycle controls the output.

Once the weather warms up, I will scope/data log my alternator control line and the output voltage and see if the FSM is...

Forum: Engine & Drivetrain

04-11-2020, 07:36 AM

Replies: 16

Alternator voltage output/Battery charge voltage

Views: 3,880

Posted By SonicVQ

Why did you decide on 10Khz? That seems...

Why did you decide on 10Khz?
That seems unusually high for a pulse width modulated signal.

The FSM shows a PWM period of about 6 ms or 166 Hz.
(Pin 76 of the IPDM/ER in section PCS)

Anyways,...

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