Service Infiniti QX4 since 1996 of release
1. Introduction
2. The maintenance instruction
3. Routine maintenance
4. The engine
5. Cooling and heating systems
5.1. Specifications
5.2. Antifreeze - the general data
5.3. Service of system of cooling
5.4. Removal, installation and check of serviceability of functioning of the thermostat
5.5. Removal, regenerative repair and installation of a radiator of system of cooling
5.6. Replacement of the water pump
5.7. Removal and installation of the fan of system of cooling
5.8. Air lines of distribution of air submitted to salon
5.9. System of an automatic air conditioning – a design and a functioning principle
5.10. A design of a refrigerator path of a central air of air
5.11. Compressor K/V, - the general information and a functioning principle
5.12. The Receiver-dehumidifier - the general information and service
5.13. Check of serviceability of functioning and service of systems of heating and an air conditioning
5.14. Diagnostics of a central air of air
6. Power supply systems and managements
7. Start and charge systems
8. A transmissionnaja line
9. Brake system
10. A suspension bracket and a steering
11. A body
12. An electric equipment
 












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5.11. Compressor K/V, - the general information and a functioning principle


Compressor K/V design


The scheme of management in size of a piston stroke


Piston stroke increase


Piston stroke reduction

The design of air of models Infiniti QX4 of the compressor applied in central airs вариаторного type (V-6) is presented on an illustration compressor K/V Design.

Design basic element вариаторных compressors is shaking отбойная the plate providing possibility of management by a piston stroke depending on requirements, shown to flowing хладопроизводительности systems. The size of a piston stroke of the compressor is defined by an angle of slope качающеся plates and provides necessary level of a discharge of a coolant in a range from 14.5 to 184 sm 3 (the Scheme of management in size of a piston stroke see an illustration).

The operating valve is included in soaking up (низконапорную) a part of a refrigerator path and opens / is closed depending on pressure in низконапорном a contour. At the expense of valve operations the pressure control inside картера is carried out. The corner of position of a shaking plate is defined by a difference of pressure in картере and the working cylinder.

With increase in temperature loadings pressure in низконапорной system parts also increases, in a consequence of that сильфонный the operating valve provides opening низконапорного and closing высоконапорного path valves (the piston stroke Increase see an illustration). Result of such switchings is alignment картерного pressure with pressure in низконапорной system parts. Now pressure in the working cylinder becomes essential above картерного that leads to transfer shaking отбойной plates in the position corresponding to the maximum piston stroke.

At movement with high speeds, and also at low temperatures in salon or outside of the car pressure in низконапорной system parts goes down (piston stroke Reduction) see an illustration. Expansion сильфона occurs at lowering of pressure to value of an order 177 кПа. Thus, pressure drop in низконапорной to a system part leads to closing of soaking up (inlet) port and opening digit (final) therefore картерное pressure raises. The difference of pressure ahead and behind the piston provides the effort influencing on приводной a finger, located near to shaking отбойной plates. A privodnoj finger with a pad take of a position in which piston develops the maximum pressure. The size of piston pressure is between values Ps (pressure in a soaking up contour) and close to it Pd (pressure from the digit party). At increase картерного pressure (Pd) at the command of management effort influencing on приводной the finger leads to reduction of an angle of slope of a shaking plate and, accordingly, piston stroke reduction.

In other words, increase картерного pressure leads to switching of a difference of pressure in картере and the working cylinder, and to respective alteration of an inclination of a shaking plate.

Муфта compressor couplings is in an active condition, its compulsory switching-off from the main switch, the switch of the fan of a heater or the ignition switch will not be made yet. Automatic switching-off муфты is made for compressor protection also at low ambient temperatures and excessive lowering of level of a coolant in system.


On page back
5.10. A design of a refrigerator path of a central air of air
On the following page
5.12. The Receiver-dehumidifier - the general information and service