Tesla's pure electric Model Y has been on the market for some time, and in addition to the price, endurance, and automatic driving functions, its latest generation of heat pump air conditioning thermal management system is also the focus of public attention. After years of precipitation and accumulation, the thermal management system developed by Tesla has been the focus of research at home and abroad Oems.
Model Y Thermal management system technology overview
The Model Y thermal management system uses the latest heat pump technology, commonly known as a "heat pump air conditioning system,"
A major structural feature of the system is the removal of the high-pressure PTC and its replacement with the low-voltage PTC in the two crew compartments. At the same time, air conditioning compressors and blowers also have an inefficient heating mode, which is used as a source of heat compensation for the entire system when the ambient temperature is below -10 ° C, which ensures that the entire heat pump system can also operate stably and reliably at -30 ° C. In the actual test, this design can also reduce the operating noise of the heat pump air-conditioning system and improve the NVH performance of the vehicle .
Another feature is the high degree of integration of the entire system, using an integrated manifold module [2] and an integrated valve module. The core of the entire module is an eight-way valve, which can be regarded as the integration of two four-way valves. The whole module adopts the way of adjusting the action position of the eight-way valve, so that the coolant can exchange heat in different circuits to ensure that the functions of the heat pump can be realized.
In general, the Tesla Model Y heat pump air conditioning system is divided into the following five operating modes, in addition to the evaporator defrosting, crew cabin fog, dehumidification and other small functions：
Individual crew cabin heating mode
Crew compartment & Battery simultaneous heating mode
Crew compartment needs heating & batteries need cooling mode
Crankshaft pulley torsion excitation
Waste heat recovery mode
The control logic of the Model Y heat pump system is closely related to the ambient temperature and battery pack temperature, any of which may affect the operation mode of the heat pump system. Their relationship can be summarized in bellow figure.
If you disassemble Tesla's heat pump system, you will find that its hardware architecture is not complex, even much simpler than the domestic application of heat pump system models, all thanks to the core of the eight-way valve (Octovalve). Through software control, Tesla has realized the application of the above five scenarios and as many as a dozen functions, and the driver only needs to simply set the air conditioning temperature, and its intelligence is indeed worth learning from domestic Oios. However, if Tesla directly cancels the use of high-pressure PTC as aggressively as this, it still needs time to test whether the car experience in cold areas will be greatly reduced.
Post time: Dec-25-2023