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FUEL SYSTEM
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F. HIGH PRESSURE (H.P) SENSOR:
Function:
HP sensor is an electronic sensor (Piezo electric
type) that sends electric signal to gas ECU. The
sensor monitors the pressure continuously and
communicates with the CNG ECU. If difference in
pressure is observed then CNG ECU understands
that as a leakage and restricts the vehicle to go to
CNG mode i.e. whenever any drop in pressure in
high pressure line is observed, HP sensor
immediately alerts the CNG ECU about the leakage
and CNG ECU will not allow the changeover to gas
mode.
The HP sensor also sends pressure signal input to
CNG ECU to show CNG in the cylinder on
instrument cluster / fuel gauge.
Mounting Location:
HP sensor is integrated with pressure regulator
assembly which is
mounted inside the Engine
compartment on rear long member.
Working Principle:
A DC signal volt is produced by this semiconductor
device when varying gas pressure acts on the
semiconductor diaphragm. To produce this output
the semiconductor device has to be excited. This
signal output increases with increase in gas
pressure.
System Integration:
This provides tank pressure signal input to ECU. The
sensor is activated by excitation voltage supplied by
ECU.
Sensor end Pin assignment: (on connector)