4%20Rear%20Air, BMW educational info, Dokumentacja

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//-->Table of ContentsRear Air ConditioningSubjectPagePurpose of the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Evaporator Housing with Actuators and Flaps . . . . . . . . . . . . . . . . . . .4Stepper motor control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Actuation reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5Calibration run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6Position run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6Refrigerant Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7Refrigerant Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9Refrigerator Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9Blower and Blower Control Module . . . . . . . . . . . . . . . . . . . . . . . . . .10Recirculating Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11Evaporator Temperature Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11Control Panel with Electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11Wiring Harness with Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . .12Calibration of left/right control panels . . . . . . . . . . . . . . . . . . . . . . . . .13Rear Air Conditioning Duct Work . . . . . . . . . . . . . . . . . . . . . . . . . . . .14System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15Control Unit Operating Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18Operation via IHKA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18Operation via controller (I-Drive) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21Filling mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21Diagnosis with Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23Control unit identification data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23Vehicle identification number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24Fault code memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24Control unit status data, defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . .24Condensation Water Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24Review Questions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25Initial Print Date:1/03Revision Date:03/03Rear Air ConditioningModel: E66Production: Start of Production MY 2003Objectives:After completion of this module you should be able to:•••Identify the components and locations of the Rear Air Conditioning SystemExplain the operation of the FKADiagnosis error conditions in the FKA2Purpose of the SystemFrom E66 series launch, aRear Compartment Air Conditioning system (FKA)may beinstalled as an option. The rear compartment air conditioner is located in the front area ofthe luggage compartment and consequently reduces the volume of the luggage compart-ment by about 20 percent (incl. trim panels).46-06-01The control and integration of the rear compartment air conditioning system in the IHKArefrigerant circuit is designed so that independent operation is possible for either the frontor rear unit.The air required for rear compartment air conditioning is drawn in via a particle filter (recir-culated air filter) from the luggage compartment.The rear compartment air conditioning system additionally supplies cold air to an integrat-ed refrigerator box. This refrigerator box should not be confused with the electrically oper-ated refrigerator box that is optionally available also for the E65.The rear air conditioning system performs the following functions:•••••Regulates air volume distributed through rear ducts.Temperature and air volume control for left and right rear occupants.Air conditioning (cooling).Electronic control of rear evaporator temperature.Operation of integrated rear compartment refrigerator box.3Rear Air ConditioningSystem ComponentsThe rear air conditioning system consists of the following components:••Evaporator Housing with Actuators and FlapsRefrigerant CircuitEvaporator and Expansion ValveRefrigerant Cut-Off ValveConnection point for refrigerant linesRefrigerator BoxBlower and Blower Control ModuleRecirculating Air FilterEvaporator Temperature SensorControl Panel with ElectronicsRear Air Conditioning Duct WorkWiring Harness with Connector•••••••1. Evaporator Housing withActuators and Flaps.2. Connection Point forRefrigerant Lines.3. Refrigerator Box4. Blower, Blower outputFinal Stage and RecirculatingAir Filter.46-06-02Evaporator Housing with Actuators and FlapsThe air is distributed and mixed by means of 4 flaps and stepper motors in the rear airconditioning unit.Stepper motor controlThe 2 stratification and ventilation flaps in each system are adjusted by means of 4 bipolarstepper motors. The stepper motors are connected by means of a step-down gear mech-anism in order to ensure the required flap torque. The connection is made up of a three-wire ribbon cable connection to which all stepper motors are connected in parallel.4Rear Air ConditioningView from frontStepper Motors for Air and Stratification Flaps1.2.3.4.DriveDriveDriveDriveforforforforair flap, R/S air volume.air flap, L/S air volume.R/S stratification flap.L/S stratification flap.View from trunkThe three bus lines carry the supply voltage, ground and serial data information. Anaddress is assigned for each of the individual stepper motors for individualization purpos-es. Each programmed address can be written only one single time and can then no longerbe deleted or changed.Each stepper motor is a controlled unit. It monitors all data on the bus, however, it acceptsand answers only if its own address is recognized and no fault has occurred in the trans-mission of the messageOnly the stepper motor with the written address matching the "monitored" addressaccepts, after checking, the content of the message, executes the received command andgenerates a status message as a response that is sent back to the control unit.Actuation reliabilityDifferent torques result for the 4 stepper motors as the result of changes in the system volt-age. While the motor is activated with low-noise sine mode at voltages V (B+TERM30)> 11 V, the drive mode changes over to full step mode at lower voltages.Changeover of drive mode:V (B+TERM30) < 9.0 VV (B+TERM30) >9.0 V and < 10.0 VV (B+TERM30) > 10.0 V and < 11.0 VV (B+TERM30) >11.0 V and < 16.0 VV (B+TERM30) > 16.0 VMotorMotorMotormodeMotorMotorstopsruns at 140 Hz and in full step moderuns at rated frequency and in full stepruns at rated frequency and in sine modestops (due to power loss in the drive IC)These conditions also apply to the calibration run!5Rear Air Conditioning [ Pobierz całość w formacie PDF ]

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