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| 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. |
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| 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. |
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| 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. |
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| 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. |
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| If, on a vehicle with two evaporators (one each in air conditioning unit and battery cooling module), 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 temperature set value is then not reached at one evaporator, -J840- actuates the shut-off valve 1 for refrigerant of hybrid battery -N516- or the shut-off valve 2 for refrigerant of hybrid battery -N517- such that refrigerant no longer flows through the evaporator which is too cold → Vehicle diagnostic tester, „Guided Fault Finding“ function for air conditioner |
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