VMAC - Vehicle Mounted Air Compressors
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Throttle Control
VMAC configures the Honda engine throttle to be wide open in its neutral state
(0 psi). Engine rpm is controlled via the throttle actuator which is operated by air
pressure from the unloader valve.
System air pressure is delivered from the WHASP Tank to the bottom of the
unloader valve (green arrows) and from there, to the throttle actuator and the
discharge valve (blue arrows). Once air pressure at the ball valve and unloader
valve (“downstream pressure”) reaches 140 psi, the throttle actuator closes
the throttle, reducing engine speed to idle. “Downstream pressure” opens the
discharge valve diaphragm, via the 1/4 in PTFE tube, and allows air pressure to
close the inlet valve poppet: (Figure 45, Figure 46, Figure 47).
Figure 45 — Throttle operation
Throttle
lever
Throttle
actuator
Discharge
valve
Unloader
valve
Compressor Regulation and Throttle
Actuator Testing
For clarity, some components have been removed from the following
illustrations.
Flow control
valve
