Quote:
Originally Posted by Astro
Motor temperature monitor, scaling back output according to temperature. Maybe a PWM cooling system output to control water cooling pump or fans. Low duty cycle when IGBTs are cool and increasing to keep IGBTs temperature below the level where power output needs to be reduced.
That way the cooling system uses the least power possible and generates the least noise possible.
Some outputs for various features that only discovered to be needed long after the PCB is manufactured.
One output i can think of would be a load indicator. Used to indicate when the motor was working hard. Could be used to inhibit things that may put added load on the motor or the batteries.
For example, if the A/C compressor was running via a belt to the drive motor then disabling the A/C clutch during heavy acceleration would be handy.
Also if an electric heater element is used then this could also be disabled during heavy acceleration. Even the DC-to-DC converter. Basically any of the high power users that may put an unneeded demand on the traction system during acceleration.
That's all i can think of off the top of my head.
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Thanks,
The water pump is a good one, with the complementary temperature sensor input
Quote:
Originally Posted by Astro
One output i can think of would be a load indicator. Used to indicate when the motor was working hard. Could be used to inhibit things that may put added load on the motor or the batteries.
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Load indicator can be taken directly from the throttle, since the user commands torque. I think this would be better suited to the display PCB (I have one PCB on the front to interface with the gauges) while the controller itself could disable the auxiliary power and the DC-DC.
I'm planning to turn on the heater for rheostatic braking, if needed.
There will also be an input to throttle back the controller, for example BMS input.
I don't expect to support Air con, I will rather make a second unit to drive an auxiliary motor. This would allow variable compressor operation on demand, so much more efficient that the stock setup.
Quote:
Originally Posted by Astro
Some outputs for various features that only discovered to be needed long after the PCB is manufactured.
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I could do that. but at this point it starts to make sense to isolate the boards, perhaps. I want to have a relatively small board. This would allow the code to be changed as per user needs. Would 8 outputs and 8 inputs (digital) be enough?