NANO

ENGINE

8. PRESSURE AND TEMPERATURE (P&T)

SENSOR

Function:

P & T Sensor is used to sense the pressure and

temperature of the gas in the gas rail coming from

the LP filter.

Working Principle:

Pressure Sensor:

A DC signal volt is produced by this sensor when

varying CNG pressure acts on the semiconductor

diaphragm. To produce this output the

semiconductor device has to be excited. This signal

output varies with change in the CNG rail pressure.

Temperature Sensor:

Semiconductor material changes it’s resistance

when exposed to variable temperature source (i.e.

gas temperature).

Type:



Pressure sensor: Piezoelectric.



Temperature sensor: NTC.

Location of Component:

This sensor is fitted on gas rail.

System Integration:

This sensor provides gas rail pressure &

temperature input to CNG ECU. The sensor is

activated by excitation voltage supplied by CNG

ECU.

Wiring details (CNG ECU & Sensor):

1: ECU pin 208 : PIN1

2: ECU pin 137 : PIN4

3: ECU pin 226 : PIN3

4: ECU pin 225 : PIN2