Expansion valve with refrigerant shut-off valve 2 for hybrid battery N517 — AUDI

Expansion valve with
refrigerant shut-off valve 2 for hybrid battery
N517
The expansion valve
A
with
N517
B
atomises the refrigerant flowing through and regulates the flow of refrigerant to the evaporator in the battery cooling module of the
hybrid battery unit
AX1
so that - depending on the heat transferred - the vapour only turns into gas at the outlet of the evaporator.
When
N517
B
is actuated by the electronic system, it is open and allows refrigerant to flow through the expansion valve
A
to the evaporator in the battery cooling module.
The expansion valve
A
with
N517
B
is installed on vehicles with battery cooling module. It is actuated in air conditioning mode if the
hybrid battery unit
AX1
needs to be cooled.
If
N517
B
is actuated by the electronic system (e.g. by the
battery regulation control unit
J840
), it is opened and allows refrigerant to flow to the evaporator in the battery cooling module according to its control characteristics.
The solenoid
N517
B
(fitted at expansion valve
A
) is actuated e.g. by the
battery regulation control unit
J840
Current flow diagrams, Electrical fault finding and Fitting locations
and
Vehicle diagnostic tester in
“Guided Fault Finding”
mode for air conditioner and battery regulation
.
If, on a vehicle with two evaporators (one each in the air conditioning unit and battery cooling module as e.g. on the Audi Q5 Hybrid), the measured temperature corresponds to or is below the specified value at one evaporator but the required specified value is not attained at the other evaporator, the system is controlled as follows: the
battery regulation control unit
J840
actuates the electric air conditioner compressor at a higher speed via the
power and control electronics for electric drive
JX1
and the
control unit for air conditioning compressor
J842
. This causes the cooling output of the air conditioner to increase and the pressure on the low-pressure side and the evaporator temperature to drop. If the required temperature value is then not reached at one evaporator,
J840
activates the
refrigerant shut-off valve 1 for hybrid battery
N516
or the
refrigerant shut-off valve 2 for hybrid battery
N517
so that refrigerant no longer flows through the evaporator which is too cold
Vehicle diagnostic tester in
“Guided Fault Finding”
mode for air conditioner
.