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Summary of change:
Been investigating PID idle control in 1.2.13 Some issues found. Proportional operating when IAC is inactive. Seems like stall prevention, needs it´s own P term for proper calibration '''"IAC close delay"''' (TPS > IAC threshold) overrides all other duty cycle values and is able to shut of the valve completely. Some engines need a minimum airflow otherwise they stumple at low TPS positions and it maybe very difficult to control the pedal at such low loads. * of course setting with the throttle-screw, or providing the necessary leak with some other method would be preferred than always powering (heating) a solenoid from electric power, but powering is also possible * Certainly 255 value would probably solve 99% but still not the proper solution * I vote 0 value be valve never closes and help should explain that. ** so with "IAC close delay"=0, apply the IAC minpwm value even infinite time after the TPS has raised > IAC TPS threshold... right ? That seems to make sense. Isn't it that way already ? *** Currently a value of 0 makes it want to close the IAC right away with a certain decline rate. I would suggest IAC DCref value as the value to be used when TPS > IAC TPS Threshold. min pwm is only so that PID values can´t force the valve so closed that it stalls the engine (I windup/down). Even better would be a configurable offset to the DCref value so that engines with light flywheels are less likely to stall coming to idle speed. In Vemstune someplaces say minmap, other lowmap, needs to be clearer if they are the same or not. Assymetric PID Conf needs explaining. Advance rate of change is a P value not a rate value and therefor needs a new name.
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