Simulation of hybrid automata using Mat-lab/Simulink

An air pressure measuring system responsive to pressure between a modulating valve and an air intake of a screw-type air compressor is calibrated in percent of the capacity of the compressor, this air intake pressure varying inversely and linearly with variations in percent of capacity at which the compressor operates. Oil is pumped with the air by the compressor to a receiver-reservoir and then through an oil filter and a cooler back to the compressor. A momentary valve normally connects an oil pressure gauge to the inlet side of the oil filter and, upon manual actuation, connects the oil pressure gauge to the outlet side of the oil filter. A second momentary valve normally connects an air pressure gauge to the receiver-reservoir and, upon manual actuation, connects this air pressure gauge to the outlet of an oil separator through which air from the receiver-reservoir passes.