hammy:
The trip for controlling the pressure in the vessel combined with the pressure relief provides two levels of safety for the operation of the compressor - adding and Arduino, does not add to the functionality, makes this a less safe system and so is not a good idea , and has no point to it !
It's apparent that further details should be presented as you're still adamant that such a system has no validity to it.
There will be two levels of safety shutoff mechanisms: a mechical diaphgram valve that would vent after a preset pressure was reached, as well as an electrical pressure switch that would cut power to the air compressor.
The former, which incorporates a built-in pressure gauge, can only be set to the correct pressure on a closed system either at or above that pressure to begin with as it's essentially a pressure relief valve. This is not very useful when inflating 4-tires simultenously (they are below their desired pressures) on a different vehicle to a different pressure than the host vehicle (we presently inflate up to 5 different vehicles from one onboard system).
The latter is difficult to adjust as it requires a tool and measurements must be taken after each adjustment to determine what pressure the adjustment was made to; this is strictly a safety switch.
The mechanical valve is part of an existing commercially available automotive inflation system and is the primary means to set a desired inflation pressure, but with the limitations mentioned above. Presently, this system has no direct means to power-off the air compressor itself.
Hence, for inflating a different vehicles' tires to a different pressure, you must constantly monitor the gauge and adjust the mechanical valve.
The time to inflate a vehicles' tires can take up to 20 minutes or longer, depending upon starting pressure point and size of tires. Thus the effort to monitor the inflation process can be long and tedious.
My proposition would be to introduce the Arduino to allow interactive, real-time adjustable control of the desired pressure to automatically turn off power to the air compressor. The two other shut-off features will provide a level of safety by being set at a pressure level within the maximum pressure ratings of the lower of the potential tires to be inflated.
hammy:
There are regulations for pressure vessels , for good reason - In my view , this is using an Arduino in a safety critical application , if it injured someone there maybe liability associated .
I'm not sure if you are using the term "pressure vessels" in the general context to include automotive tires, or whether you are misunderstanding the application and believe I'm implementing this on a system utilizing a metal storage container (i.e. air tank). No sir, there is no air tank or other such "pressure vessel" other than what may be self-contained within the air compressor itself (which for the model I will be using, is just an air pump with no physical tank).
In regards to "liability," I will be augmenting a commercially available system, which the Arduino will be working with pressures below the manual relief valve setting, which would be below the max air pressure ratings of the tires being inflated. On top of which, I will be adding the electrical shut-off switch.
hammy:
You could use Arduino to turn the system on or off and measure the pressure if you wanted , but I would not override safety features
Never have I proffered to override safety features.
