The trick is the very well mappable boost-target.

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Actuation implementation

Since the solenoids people kept finding were on/off type with 20..30 Hz max frequency, the original high frequency softpwm implementation had to be changed.

3 parts:

* initialize

* pid (userspace) calculations. Ideally best to calculate pid just before actuation (eg. always before falling edge - since the rising edge timing varies).

* actuation (userspace or interrupt or combo)

** DROPPED: actuation of both edges in interrupt with EventQueue the same way as OutputTrigger mst..msp..msq..

** pid() calculation called from (userspace) vems.c mainloop every N msec using softelapsed(). We do the activation edge right from there. The other edge is scheduled via eventqueue (unless the output is railed at 0 or 100%). Take care with duty overflow (similar way as for injection).

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PID tuning

PID parameter tuning of such a system is not trivial.

* I want to do some measurements on the valve and restriction on the table. Especially since it's almost impossible to get proper datasheet from solenoid valve manufacturers.

* I cannot measure the wastegate's effect without the engine though

* compressor

* compressor supply

* solenoid valve

* restriction

* noise (another restriction and pneumatic switch?) to disturb the controller

* pressure sensors

* controller (GenBoard/VerThree)

* datalogging

* el. connections

* pneumatic connections

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Pneumatic valve flowbench setup

My tire inflating compressor eats 11..12A from 12V supply, so I had to use a battery for this.

* compressor

* pressure container

* gauge

* adjustable blow-off valve (red cap near the gauge)

* MPX700A (inside the 1" T)

* MPX4250AP (inside the 1" T)

* unfortunately I lost the paper that has the pinout of the cable: the 1" T with absolute pressure sensors was used in an earlier experiment to calibrate MPX700A at several temperatures

Playing with filling and charging a dry battery

I got a dry Lead-acid battery that I should fill and charge for the experiments. Looking for the sulphuric acid concentration to fill up originally with. I'll have to slowly charge and discharge a few times.

* google: lead acid battery fill sulphuric acid concentration charge

* http://www.ibmwr.org/otech/newbattery.html

* http://www.du.edu/~jcalvert/phys/lead.htm#Batt history and "electrolyte of dilute sulphuric acid of specific gravity 1.28. This is a 37% solution, with 472.5 g/l of H2SO4. At full discharge, the electrolyte is of specific gravity 1.05, an 8% solution containing 84.18 g/l of acid. Both plates are coated with PbSO4"