1、Slide 1Slide 2Slide 2Adaptive Cruise ControlIncorporating Advanced Emergency Brake AssistSlide 3ACC - ReviewACC system uses forward looking radar sensor to scan road aheadTarget identified - ACC system monitors time gap between host and target vehiclesWhen gap falls below a selected level ACC interv

2、enesVehicle slows until the correct gap is attained by:Backing off the throttleApplying the brakesDriver chooses between four gap settingsGap setting displayed in ICSystem active:20 mph (32 km/h).Slide 4Warning LampsAdaptive cruise control/follow mode active (amber)Target vehicle in rangeCruise cont

3、rol active (green) Forward alert active (green)Provides additional warnings of vehicles ahead.Slide 5Control SwitchesSet speed/increase speedResumeDecrease set speedGap decreaseCancelGap increase Ladder switch signals transmitted over LIN bus to CJBCJB to ACC via CAN bus.Slide 6Gap Setting DisplayPr

4、e-set gap setting displayed in IC message center1 second1.4 seconds1.8 seconds2.2 seconds.Slide 7Radar Sensor AlignmentIf radar sensor replaced:Carry out vertical alignment using Jaguar leveling gaugeHorizontal alignment: Place sensor in service mode with the Jaguar Approved Diagnostic EquipmentDriv

5、e vehicle until calibration complete (Follow Mode icon stops flashing)Note: Observe service alignment process mendations.Slide 8Forward Alert - ReviewSystem active when warning icon in IC illuminatedCan be switched on/off in IC Vehicle Set-up menuProvides audible and message center Forward Alert war

6、nings of vehicles aheadThrottle and braking intervention is NOT appliedCan be active when ACC switched offSensitivity of warning is set using gap increase/decrease switches.Slide 9Electronic Brake Prefill - ReviewElectronic brake prefill senses rapid throttle lift off which:Activates small brake hyd

7、raulic pressure build-up of approx 3 to 5 bar (43.5 to 72.5 lbf/in)Anticipates brake applicationProduces a quicker brake pedal responseShortens stopping distanceOperating process as follows:ECM HS CAN message rapid throttle lift off to ABSABS activates HCU to apply low brake pressure. Slide 10Emerge

8、ncy Brake Assist - ReviewEBA function:Assists driver in emergency braking situationsHow:Automatically increases applied braking effortEBA activated by ABS when:Brake pedal pressed rapidlyBrake pedal pressed hard enough to invoke ABS operationWhen brake pedal pressed rapidly:ABS increases hydraulic p

9、ressure to all brakes up to ABS threshold Maximum braking effort applied for available tractionABS monitors brake pedal switch and rate of hydraulic pressure increase Rate of pressure increase exceeds predetermined limit ABS applies EBAEBA continues until brake pressure drops below a stored threshol

10、d.Slide 11Advanced Emergency Brake Assist - IntroductionAEBA uses ACC technology to provide preemptive braking controlEnhancement of electronic brake prefill and EBAThe system senses:Possibility of collision before driver brake pedal reactionPrepares braking process prior to driver reactionWhen the

11、driver reacts:System responds to emergency braking more promptlySystem activates if risk of collision increases after Forward Alert warningBrakes are automatically applied (gently) prior to rapid brakingEBA activation threshold lowered. Slide 12Advanced Emergency Brake Assist - IntroductionAEBA uses

12、 signals from ACCProximity and closing speed to vehicle in frontSignals monitored using ACC radar sensorSystem functions earlier than vehicles without radar sensor dataAEBA functions at speeds above 5 mph (7 km/h)System also functions when:ACC switched offForward Alert switched off.Slide 13Principle

13、 of OperationForward Alert/AEBA system response to imminent collision:Forward Alert warningAEBA 1st stage prechargeDriver takes no actionAEBA requests fixed precharge brake pressure (approx 3 bar)EBA threshold reducedAEBA 2nd stage prechargeDriver responds (for example quick release of throttle)AEBA

14、 requests fixed precharge brake pressure (approx 10 bar)Note: - Throttle already released - precharge 1 and 2 occurs simultaneously - system moves directly to precharge level 2.Slide 14Sequence of EventsRadar sensor detects vehicle ahead moving in same direction as host vehicleIn the event of collis

15、ion risk:Forward Alert warning (if switched on)AEBA - 1st stage pre-charge approx 3 bar (stop lamps on)AEBA - 2nd stage pre-charge approx 10 bar (throttle release).Slide 15Brake Pressure CharacteristicsAEBA enhances performance of EBA by:Requesting brake system pre-charge pressure Increasing sensiti

16、vity of EBA activationGraph below illustrates brake system comparison. Percentage brake forceTimeConventional brake systemEBAAEBA.Slide 16NotesThe AEBA system:Only operates at speeds above 5 mph (7 km/h)Only responds to vehicles moving in the same directionIs NOT a collision avoidance systemEffectiv

17、eness depends on many factors including:Vehicle speedDriver inputRoad conditionsDOES NOT WARN FOR STATIONARY OR SLOW MOVING VEHICLESStop lamps always activated on application of service brake.Slide 17ACC Control DiagramSlide 18Malfunction WarningsACC malfunction while system operational:System switc

18、hes off until fault clearedIC message center displays:Driver Intervene replaced by Cruise Not AvailableACC or related system malfunction at other times:ACC function cannot be activated in any modeIC message center displays:Cruise Not AvailableAEBA malfunction warning:If fault condition exists for five consecutive ignition cyclesIC message cent