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1、Service Training11.01Edition 09.2000Externally Controlled Air-Conditioner CompressorTrainer Information (GB)Service TrainingTrainer Information, Externally Controlled Air-Conditioner Compressor 11.01 (GB)K-VK-36/sm/TI_11_01_(GB).doc2/1317.10.00Contents SectionPage1 Compressor3 1.1 Model description3
2、 1.2 External control4 1.3 Air-conditioner compressor regulating valve N28052 Drive pulley11 2.1 Description of operation11Service TrainingTrainer Information, Externally Controlled Air-Conditioner Compressor 11.01 (GB)K-VK-36/sm/TI_11_01_(GB).doc3/1317.10.001Compressor1.1Model descriptionThe extern
3、ally controlled compressor 6 SEU 12 from DENSO is a single-acting rotary swash plate compressor with 6 pistons (refer also to SSP 240 “Audi A2 Technology“). It is used in the Lupo FSI and operates on the same basic principle as the internally controlled rotary swash plate compressor (refer to SSP 20
4、8 “Air conditioners in motor vehicles“).A new type of pulley with integrated overload protection obviates the need for a magnetic clutch, as the piston displacement can be reduced to virtually 0% for compressor OFF in combination with the external control. Dispensing with the magnetic clutch results
5、 in a weight saving of approx. 500 g.Service TrainingTrainer Information, Externally Controlled Air-Conditioner Compressor 11.01 (GB)K-VK-36/sm/TI_11_01_(GB).doc4/1317.10.001.2External controlThe output of the air-conditioner compressor is infinitely controlled by the operating and display unit E87
6、via a new regulating valve featuring an electromagnetic unit. This enables the evaporator vent temperature to be set as required and permits energy-saving adjustment of the necessary refrigeration capacity with reduced additional heating (reheating).The operating and display unit E87 uses the signal
7、 from the evaporator vent temperature sender G263 as input information on the evaporator vent temperature.Service TrainingTrainer Information, Externally Controlled Air-Conditioner Compressor 11.01 (GB)K-VK-36/sm/TI_11_01_(GB).doc5/1317.10.001.3Air-conditioner compressor regulating valve N280The air
8、-conditioner compressor regulating valve is a valve featuring both a purely mechanical component (A) and an electromagnetic function (B). The electromagnetic function of the valve is principally responsible for control action.Component AThe mechanical function in the form of a pressure- sensitive el
9、ement in the low-pressure circuit of the valve influences control action on the basis of the pressure conditions on the low-pressure end.Service TrainingTrainer Information, Externally Controlled Air-Conditioner Compressor 11.01 (GB)K-VK-36/sm/TI_11_01_(GB).doc6/1317.10.00Component BThe valve is act
10、uated by E87 with a pulse frequency of 500 Hz. This relatively high number of cycles causes the valve tappet to assume a sort of “suspended“ state. In other words, the tappet hardly ever reaches the end stops in the course of control action. The distance which the tappet can travel between the end s
11、tops spans only a few tenths of a millimetre. Despite the minimal travel this still clearly represents control action covering all intermediate ranges from fully open to completely closed.Service TrainingTrainer Information, Externally Controlled Air-Conditioner Compressor 11.01 (GB)K-VK-36/sm/TI_11
12、_01_(GB).doc7/1317.10.00The valve is open when deenergised. The high-pressure and compressor crankcase ducts are connected with one another. The pressure in the high-pressure chamber is equal to that in the crankcase chamber.The three relevant pressures are applied to the valve from the: - Compresso
13、r crankcase (A) - High-pressure end (B) - Low-pressure end (C)Service TrainingTrainer Information, Externally Controlled Air-Conditioner Compressor 11.01 (GB)K-VK-36/sm/TI_11_01_(GB).doc8/1317.10.00Full loadControl action to achieve full load operation is implemented by the valve closing and isolati
14、ng the crankcase chamber (A) from the high-pressure chamber (B). This causes the crankcase pressure to drop. The high pressure can then move the swash plate in full-load direction via the piston surface and against the force of the swash plate spring. The compressor is set to full-load stop and thus
15、 to maximum delivery (100%).Service TrainingTrainer Information, Externally Controlled Air-Conditioner Compressor 11.01 (GB)K-VK-36/sm/TI_11_01_(GB).doc9/1317.10.00Delivery reductionIf, for example, the system is switched off or a low cooling output is requested, the valve connects the high-pressure
16、 chamber to the crankcase chamber. This results in pressure equilibrium in the pressure chamber upstream of the pistons/downstream of the pistons in the crankcase chamber. The swash plate spring can then move the swash plate in the direction of zero delivery. Although it would be possible for the compressor to assume a 0% delivery setting, the swash plate actually comes to a stop at a value of “less than 2%“, but this is equivalent to zero delivery or compressor OFF.In a
