Temperature Compensated Refuelling Process - Compac CNG Service Manual

Temperature Compensated Refuelling Process

The technical operation of a temperature compensated dispenser is as follows:
▪ Press the start button or remove the nozzle from the holster to initiate a fill.
The display will indicate 888888 and then clear, at this point both the
gas and value totals will display 0. 0 0.
▪ Connect the refuelling nozzle to the vehicle.
▪ The refuelling valve is opened and when flow is detected the solenoids shut
immediately. Pressure reading (��
recorded.
▪ The compensated fill pressure Ptc is calculated. If the vehicle is within 20 bar
of this pressure, no filling takes place.
▪ The solenoids are opened, and filling continues as follows:
o If �� was less than 50bar(��
1
seconds.
o If �� was greater than 50bar but less than 100bar
1
(50 < ��
o If �� was greater than 100bar but less than 150bar
1
(100 < ��
o If �� was greater than 150bar but less than 180bar
1
(150 < ��
▪ The solenoids shut and pressure reading (��
are recorded.
▪ The amount of gas (����
follows:
▪ The dispenser fills to ������
) and amount dispensed (����
1
< 50), the fill will continue for 20
1
< 100), the fill will continue for 14 seconds.
1
< 150), the fill will continue for 10 seconds.
1
< 180)r, the fill will continue for 6 seconds.
1
) to completely fill the vehicle to ��
2
(���� − ����
2 1
������ =
1
( ��
2
and stops. This is the end of the fill.
1
11.
) are
1
) and amount dispensed (����
2
is calculated as
��
) ∗ (�� − �� )
�� 1
− �� )
1
)
2