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BMW F12 2011 Technical Training Manual Download Page 51

F12�Chassis�Dynamics

5.�Steering

47

F12�24�V�operation�of�EPS

Index

Explanation

1

Battery�power�distribution�box

2

Battery

3

Intelligent�battery�sensor�IBS

4

Auxiliary�battery

5

Separator

6

Charging�controller�for�auxiliary�battery�(Battery�Charge�Unit�[BCU])

7

Luggage�compartment�power�distribution�box

Terminal�30

Terminal�30

Terminal�30F

Terminal�30,�fault-dependent

LIN-Bus

Local�interconnect�network�bus

The�relay�in�the�separator�connects�the�battery�and�auxiliary�battery�in�series�in�order�to�operate�the

EPS�with�24�V.

Summary of Contents for F12 2011

Page 1: ...Technical training Product information BMW Service F12 Chassis Dynamics...

Page 2: ...European version of left hand drive vehicles Some operating el ements or components are arranged differently in right hand drive vehicles than shown in the graphics in this document Further differenc...

Page 3: ...s 12 3 5 Tire Pressure Monitor System 13 3 5 1 System function 13 3 5 2 System overview 15 3 5 3 System wiring diagram 16 3 5 4 Notes for Service 17 4 Brakes 19 4 1 Service brakes 19 4 2 Electromechan...

Page 4: ...bility control 53 6 1 Directions of action 53 6 2 Dynamic Stability Control DSC 53 6 3 Electronic Damper Control EDC 54 6 4 Active Roll Stabilization ARS Dynamic Drive 55 6 5 Drive dynamic control swi...

Page 5: ...bility Control DSC 7 Brakes 8 Double wishbone front axle The chassis and suspension of the F12 is based on the F10 It has been adapted to the specific re quirements of the F12 in order to achieve outs...

Page 6: ...2 The F12 features innovations already familiar from other BMW models such as Integral Active Steer ing Integrated Chassis Management ICM Dynamic Drive and Electronic Damper Control EDC 1 2 Bus syste...

Page 7: ...VD changer EDCSHL Electronic Damper Control satellite rear left EDCSHR Electronic Damper Control satellite rear right EDCSVL Electronic Damper Control satellite front left EDCSVR Electronic Damper Con...

Page 8: ...S Tire Pressure Monitor System SINE Siren with tilt alarm sensor SMBF Front passenger seat module SMFA Driver s seat module SWW Blind Spot Detection Lane change warning SZL Steering column switch clus...

Page 9: ...gs dampers Steel spring con ventional or EDC Steel spring con ventional or EDC Anti roll bar front mechanical or hy draulic Dynamic Drive mechanical or hy draulic Dynamic Drive Front brake disc dia 34...

Page 10: ...2 Double wishbone front axle Index Explanation 1 Spring strut 2 Upper wishbone 3 Swivel bearing 4 Anti roll bar link 5 Lower wishbone 6 Wheel hub 7 Track rod 8 Trailing link 9 Front axle support 10 An...

Page 11: ...n 10 12 Toe difference angle 12 Steering axis inclination 9 57 Rim offset IS 30 mm Kingpin offset 2 89 mm Track width 1600 mm maximum outer steer angle 33 0 maximum inner steer angle 42 14 3 1 2 Servi...

Page 12: ...ack rod end to track rod YES Track rod end to swivel bearing NO Spring strut to Lower wishbone NO Support bearing to body NO Bottom steering shaft to steering box NO Steering column to bottom steering...

Page 13: ...ics 3 Chassis and suspension 9 F12 Integral V rear axle Index Explanation 1 Compression strut 2 Spring strut 3 Upper wishbone 4 Integral link 5 Wheel carrier 6 Wheel bearing 7 Trapezoidal link suspens...

Page 14: ...tables show when wheel alignment at the integral V rear axle is necessary Component replaced Wheel alignment required Rear axle support YES Rubber mount for rear axle NO Swinging arm YES Integral lin...

Page 15: ...t to wheel carrier swinging arm NO 3 3 Suspension dampers Both axles of the F12 are equipped as standard with steel springs and EDC shock absorbers 3 3 1 Electronic Damper Control EDC F12 Components o...

Page 16: ...the ARS control and thus assists in reducing the rolling movement of the vehicle EDC can also detect when the driver is braking based on the information supplied by the DSC on brake pressure A high b...

Page 17: ...ess During the teach in process the wheel electronics identification numbers IDs are transmitted to the TPMS control unit The TPMS control unit can identify the wheel position of the corresponding whe...

Page 18: ...te the wheel electronics send the pressure temperature and also the identification numbers of the tires to the TPMS control unit at regular intervals when driving If a pressure change of 20 kPa 0 2 ba...

Page 19: ...suspension 15 3 5 2 System overview F12 System overview of TPMS Index Explanation 1 Wheel electronics battery operated sensor with transmitter unit 433 MHz 2 Instrument panel KOMBI 3 TPMS control unit...

Page 20: ...F12 Chassis Dynamics 3 Chassis and suspension 16 3 5 3 System wiring diagram F12 System wiring diagram RDC...

Page 21: ...essure has been changed A tire change has been carried out Wheels have been replaced The driver can start the teach in process via the Central Information Display CID and the controller For more infor...

Page 22: ...lling the wheel electronics To clean the wheel electronics simply wipe down with a clean cloth Do not apply solvents or cleaning agents to the wheel electronics or clean them with com pressed air F12...

Page 23: ...htweight construction brake discs with riveted aluminium disc centers sections are installed at the front and rear axle of the F12 Conventional bracket type aluminium floating calipers are used on the...

Page 24: ...the rear brake calipers of the F12 The use of the electromechanical parking brake offers the following advantages Operated via an ergonomic button in the center console Safe and reliable application...

Page 25: ...F12 Chassis Dynamics 4 Brakes 21 4 2 1 System overview F12 System overview Electromechanical Parking Brake EMF...

Page 26: ...ke button 2 Wheel speed sensor front left not used for EMF 3 Wheel speed sensor front right not used for EMF 4 Wheel speed sensor rear right 5 Wheel speed sensor rear left 6 EMF actuator rear left 7 E...

Page 27: ...F12 Chassis Dynamics 4 Brakes 23 4 2 2 System wiring diagram F12 System wiring diagram Electromechanical Parking Brake EMF...

Page 28: ...o engage the parking brake through the park ing brake button The vehicle condition is queried detected via the electrical system connection and the bus systems The control unit decides whether all con...

Page 29: ...tary gears 5 Housing 6 Connection to spindle The EMF actuator is fixed to the brake caliper and acts directly on the brake piston The force is transmitted to a two stage planetary gear system 4 by an...

Page 30: ...Spindle nut with anti twist lock 3 Brake piston 4 Spindle 5 Spindle end stop 6 Connection to planetary gearing F12 Current and force progression of Electromechanical Parking Brake EMF Index Explanati...

Page 31: ...mics 4 Brakes 27 F12 Overview of EMF actuator with brake caliper Index Explanation 1 Plug connection 2 Electric motor 3 Drive belt 4 Planetary gears 5 Housing 6 Brake piston 7 Spindle and spindle nut...

Page 32: ...ton is imported by the EMF control unit The EMF actuators on the rear brake calipers are individually con trolled by the EMF control unit The parking brake can be applied in any logical terminal statu...

Page 33: ...ure monitoring The temperature monitoring function ensures that the loss of parking brake force that occurs when hot brake discs cool down is compensated for The temperature monitoring function is act...

Page 34: ...ring dynamic emergency braking brake pressure is generated hydraulically at all four wheel brakes The DSC functions are fully active and the brake lights are operated That represents a fundamental adv...

Page 35: ...ode is automatically activated F12 Electromechanical Parking Brake EMF showing spindle nut in working position for brake pad replacement The parking brake cannot be applied while the EMF control unit...

Page 36: ...e target positions are then approached one by one at three second inter vals When brake test stand mode is active and the EMF actuators are released the parking brake indicator light flashes slowly Wh...

Page 37: ...with parallel axis arrangement EPS APA familiar from the F10 is used Active steering and rear axle slip angle control are available in the Integral Active Steering optional equipment package 2VH F12 S...

Page 38: ...is environmentally cleaner than conventional hydraulic power steering For reasons inherent in the system EPS is always equipped with the Servotronic function Two differ ent settings Normal and Sporty...

Page 39: ...sign of the EPS are identical with those of the F10 and are described in detail in the F10 Chassis Dynamics training material For more information regarding the parking assistant feature refer to the...

Page 40: ...F12 Chassis Dynamics 5 Steering 36 5 1 2 System wiring diagram F12 System wiring diagram for basic steering...

Page 41: ...ution box 4 Junction box electronics JBE 5 Integrated Chassis Management ICM 6 Intelligent battery sensor IBS 7 Battery 8 Battery power distribution box 9 Steering column switch cluster SZL 10 Instrum...

Page 42: ...or is braked and disabled by a lock The full range of vehicle maneuverability is retained as a permanent mechanical connection between the steering wheel and the front wheels exists Low speed range Th...

Page 43: ...icle it initiates coordinated steering interventions on the front and rear wheels The speed of the stabilizing intervention is such that it is hardly perceptible by the driver Decelerating DSC brake i...

Page 44: ...y the DSC With the introduction of active rear axle steering corrective action is now possible in understeering sit uations through intervention of the Integral Active Steering which further increases...

Page 45: ...F12 Chassis Dynamics 5 Steering 41 5 2 2 System wiring diagram F12 System wiring diagram of Integral Active Steering...

Page 46: ...r axle slip angle control HSR 13 Luggage compartment power distribution box 14 Battery power distribution box 15 HSR actuator 16 Hall effect sensor 17 Steering tie rod position sensor 18 Ride height s...

Page 47: ...EPS control unit 7 Electric motor with motor position sensor As with the F10 higher steering forces are required due to the active steering at the front axle 12 V power steering would no longer be su...

Page 48: ...nts Index Explanation 1 Battery 2 Separator 3 Auxiliary battery 4 Charging controller for auxiliary battery Battery Charge Unit BCU The following system wiring diagram shows how the 24 V components ar...

Page 49: ...F12 Chassis Dynamics 5 Steering 45 F12 System wiring diagram of EPS with 24 V and active steering...

Page 50: ...run Terminal 30 Terminal 30 Terminal 30F Terminal 30 fault dependent LIN Bus Local interconnect network bus The BCU charges the auxiliary battery with the assistance of a DC DC converter It monitors t...

Page 51: ...liary battery 5 Separator 6 Charging controller for auxiliary battery Battery Charge Unit BCU 7 Luggage compartment power distribution box Terminal 30 Terminal 30 Terminal 30F Terminal 30 fault depend...

Page 52: ...nsor IBS 4 Auxiliary battery 5 Separator 6 Charging controller for auxiliary battery Battery Charge Unit BCU 7 Luggage compartment power distribution box LIN Bus Local interconnect network bus The sep...

Page 53: ...for this from the vehicle electrical system via the Luggage compartment power dis tribution box When the Electric Power Steering is in 24 V mode the auxiliary battery is charged via the charging contr...

Page 54: ...HSR actuator on the rear axle is fastened underneath a support plate on the rear axle sup port This electromechanical actuator is located between the two camber links of the integral V rear axle The...

Page 55: ...ut 5 Electric motor 6 Electrical connection 7 Right shaft gaiter 8 Right track rod joint 9 Iron casing 10 Armature winding 11 Rotor winding with iron core 12 Support armature winding iron core The ele...

Page 56: ...d nut rear wheel steering gear is self inhibiting This means that if the system fails the vehicle has the same drivability is a vehicle without rear wheel steering The components of Integral Active St...

Page 57: ...ions such as oversteer or understeer The DSC helps to keep the vehicle on a safe course within the physical limits by reducing engine power output and individually modulating the brake intervention at...

Page 58: ...ne torque control MSR Engine drag control BMR Braking torque control DSC Dynamic Stability Control GMR Yaw force control SDR Overrun differential control DTC Dynamic Traction Control The DSC can be op...

Page 59: ...vertical acceleration of the wheel is recorded by the acceleration sensors integrated in the satel lite The movement of the vehicle body is determined based on the wheel acceleration and ride height...

Page 60: ...d or calculated Vehicle speed Current lateral and longitudinal acceleration Body and wheel acceleration Steering wheel position Ride heights Control commands are sent to the hydraulic swivel motors of...

Page 61: ...F12 Chassis Dynamics 6 Driving stability control 57 F12 Dynamic Drive system wiring diagram...

Page 62: ...ive 6 Front suspension pressure sensor rear suspension pressure sensor 7 Shift position sensor 8 Failsafe valve direction valve and pressure valves 9 Vertical Dynamics Management 10 Junction box for t...

Page 63: ...F12 Chassis Dynamics 6 Driving stability control 59 F12 EDC system wiring diagram...

Page 64: ...ol satellite front right 6 Junction box for the power distribution box 7 Vertical Dynamics Management 8 Drive dynamic control switch 9 Integrated Chassis Management ICM 10 Electronic Damper Control sa...

Page 65: ...ll drivetrain and driving stability control systems can also be influ enced via the driving dynamic control switch The operating principle is the same as the F01 In addi tion to the three different mo...

Page 66: ...al Normal Sports Sports Shift program Normal Normal Sports Sports Shift speed Normal Normal Sports Sports Chassis and sus pension systems Steering servo Normal Normal Sports Sports Integral Active Ste...

Page 67: ......

Page 68: ...Bayerische Motorenwerke Aktiengesellschaft H ndlerqualifizierung und Training R ntgenstra e 7 85716 Unterschlei heim Germany...

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