GF42.47-P-0001FLM Adaptive brake (ABR), function

Transcription

1 GF42.47-P-0001FLM Adaptive brake (ABR), function MODEL 212 (except /098/298) as of model year 2014 Function requirements, general the engine is running or has been switched off by the ECO start/stop Circuit 61 ON function Adaptive Brake (ABR) is functional DISTRONIC PLUS is not active (with ABR Premium system (with code (233) DISTRONIC PLUS)) ABR, general OFF condition is not present at the standstill coordinator ABR assists the driver in dangerous situations which occur suddenly the vehicle is not sliding and thus serves active safety. To do so, the Electronic Stability Program control unit (N30/4) (except If the driver releases the brake pedal, an incline-dependent hold CODE 233 (DISTRONIC PLUS), except CODE 990 (AMG vehicles)) or pressure is set and maintained until the driver depresses the brake the Premium Electronic Stability Program control unit (N30/7) (with pedal again or drives off. Pressure reduction when starting off is CODE 233 (DISTRONIC PLUS) or with CODE 990 (AMG vehicles)) performed by the standstill coordinator according to the respective evaluates the data from the following components in order to situation. determine the current driving situation: Yaw rate sensor for lateral and longitudinal acceleration (B24/15) The HOLD function is deactivated automatically if: Left front axle rpm sensor (L6/1) the accelerator pedal is depressed (except in position "N") Right front axle rpm sensor (L6/2) the selector lever is set to position "P" Left rear axle rpm sensor (L6/3) the brake pedal is depressed again with a certain pressure until the Right rear axle rpm sensor (L6/4) "HOLD" status line disappears in the instrument cluster Steering angle sensor (N49) Warning strategy (on vehicles with electronic selector lever Brake lights switch (S9/1) module control unit (N15/5)), with transmission If the HOLD function is activated and the driver wants to leave the There are 2 ABR variants in use: vehicle, removal of the transmitter key (A8/1) from the electronic ABR standard system (except CODE 233 (DISTRONIC PLUS)) ignition lock control unit (N73) is prevented. An acoustic and optical ABR premium system (with CODE 233 (DISTRONIC PLUS)) warning will be issued through the instrument cluster. Safety strategy (for vehicles with intelligent servo module for DIRECT SELECT (A80)), with transmission There are no differences between the variants with respect to the If the HOLD function is activated and if the driver wishes to leave the ABR subfunctions described below. vehicle, the position "P" is automatically engaged by the intelligent The system is made up of the following subfunctions: servo module for DIRECT SELECT when the vehicle is at a standstill Function sequence for Electronic Stability Program (ESP) and the transmitter key removed. Electronic brake force distribution (EBD) function sequence A warning is issued on the instrument cluster. Function sequence of exhaust test, dynamometer test mode Antilock brake system (ABS) function sequence Function sequence for ASR and ESP passive switching, except Function sequence for acceleration skid control (ASR), model 212 (with CODE 990 (AMG vehicles)) electronic traction system (ETS) In driving mode the ASR and ESP functions can be switched passive Brake Assist (BAS) function sequence with the left multifunction steering wheel button group (S110) and right Function sequence for BAS PLUS, with CODE 233 multifunction steering wheel button group (S111) via the "Assist" menu (DISTRONIC PLUS) and "ESP" submenu in the IC. Function sequence for ESP trailer stabilization (with CODE The instrument cluster receives control signals from the multifunction 550 (Trailer hitch)) steering wheel (MFL) in the following way: Function sequence for Hill-Start Assist (HSA) Steering wheel electronics (N135) Dry braking function sequence Steering LIN (LIN E1) Function sequence for precharging depending on accelerator Steering column tube module control unit (N80) pedal actuation chassis CAN 1 Function sequence for precharging depending on lateral Front SAM control unit with fuse and relay module acceleration Chassis CAN 2 Function sequence for HOLD function The instrument cluster then sends the "ESP_OFF" request via chassis Function sequence for ASR and ESP passive switching, CAN 1 and chassis CAN 2 with the front SAM control unit with fuse except model 212 (with CODE 990 (AMG vehicles)) and relay module interface to the Electronic Stability Program control Function sequence for ASR and ESP ON, Sport or OFF, only unit (except CODE 233 (DISTRONIC PLUS)) or the Premium with model 212 (with CODE 990 (AMG vehicles)) Electronic Stability Program control unit (with CODE 233 (DISTRONIC Function sequence for fail boost (with CODE B03 (ECO start/ PLUS)). If the functions are switched passive, the ESP warning lamp lights up in the instrument cluster. The control thresholds are raised Function sequence for over boost (with CODE B03 (ECO start/ when the ASR and ESP functions are switched passive. ABS cannot be deactivated. ESP is always active during a brake Function sequence - PRE-SAFE application. Function sequence for cruise control (CC) Function sequence - standstill coordinator (SSK) Function sequence for ASR and ESP ON, Sport or OFF, only with Steer Assist function sequence model 212 (with CODE 990 (AMG vehicles)) Function sequence for adaptive brake lights flashing (except ESP can be operated in 3 different operating modes. It is possible to with code 494 (USA version)) switch between the operating modes by pressing the AMG ESP Sport Off button (S193/1). To switch between ESP ON and ESP Sport mode, System fault display function sequence ESP function sequence press the ESP OFF switch only briefly. The ESP is switched off by Page 1 of 5

2 pressing the AMG ESP Sport Off button for t > 2.5 s. The status of the ESP prevents the vehicle from breaking away when oversteering or AMG ESP Sport Off button is read in by the transmission mode control understeering. It ensures that the vehicle does not deviate from the unit (N145) and sent via chassis CAN 1 to the Premium Electronic course specified by the driver (within physical limits). Brake forces are Stability Program control unit (with CODE 233 (DISTRONIC PLUS)). produced selectively at the individual wheels to correct any deviations. The operating modes are: Furthermore, reduction of the drive torque takes place in order to ESP ON increase driving stability. ESP SPORT ESP OFF Premium Electronic Stability Program control unit (with CODE 233 ESP ON (DISTRONIC PLUS) or with CODE 990 (AMG vehicles)) processes the ABS, ASR and ESP operate as on series production vehicles with following measured quantities in order to determine the vehicle's adjusted control thresholds. behavior: The Electronic Stability Program warning lamp and the ESP /ASR - yaw velocity OFF warning lamp (A1e32) in the instrument cluster are off, during an - Steering angle ESP intervention the Electronic Stability Program warning lamp flashes - Brake pressure on and off. - Engine torque ESP SPORT - Transmission shift stage The ABS operates as on series production vehicles with adapted - Lateral acceleration control thresholds. When engine torque control is active, ASR operates with significantly reduced intervention strength and adjusted single- A differentiation is made between the following vehicle characteristics: sided brake system interventions to improve traction. ESP operates as Intervention in the case of oversteer with reduced intervention strength and adapted control thresholds. Intervention in the case of understeer The Electronic Stability Program warning lamp in the instrument cluster remains lit; it flashes during ESP intervention. The message "ESP Intervention in the case of oversteer SPORT" appears in the instrument cluster. If the vehicle begins to oversteer, brake pressure is built up at the outer ESP OFF front wheel. The resulting reduction in lateral force at the outer front The ABS is configured for maximum deceleration. Ride comfort is of wheel generates a yawing moment which counteracts the tendency of secondary importance. the vehicle to rotate inward. The vehicle speed decreases as a result ASR operates without engine torque control. Only the single-sided of the brake force at the front wheel, which also enhances stability. brake system interventions to improve traction are active. Intervention in the case of understeer ESP is completely deactivated, no engine torque or brake system If the vehicle understeers, the maximum possible lateral force at the interventions are made. front axle has been exceeded. In other words, the vehicle pushes via The Electronic Stability Program warning lamp and the ESP /ASR the front axle to the outer edge of the curve. The resulting instability is OFF warning lamp in the instrument cluster remain lit. The message counteracted by means of a reduction in drive torque and the following "ESP OFF" appears in the instrument cluster. brake interventions at up to 3 wheels: - Brake pressure buildup at rear wheel on inside of curve (stage 1) - Stage 1 and in addition brake pressure buildup at rear wheel on All Pre-Safe functions are deactivated in ESP OFF mode. outside of curve (stage 2) Function sequence for fail boost (with CODE B03 (ECO start/stop - Stage 2 and in addition brake pressure buildup at front wheel on function)) inside of curve (stage 3) The fail boost function ensures that a sufficiently high brake pressure Depending on the brake force, a torque is generated which causes the level is maintained in the system in situations where the BAS brake vehicle to rotate inward with a simultaneous reduction in speed. This booster is unable to provide an adequate brake boost. has a considerable stabilizing effect. If, during a brake operation by the driver, the brake vacuum sensor (B64/1) (with CODE B03 (ECO start/ detects that the BAS brake booster is unable to provide any driver assistance, the fail Premium Electronic Stability Program control unit (with CODE 233 boost function provides driver assistance by actuating the traction (DISTRONIC PLUS) or with CODE 990 (AMG vehicles)) sends a system hydraulic unit. Hydraulic boosting occurs with a suitable boost signal to reduce the drive torque via chassis CAN 1 (CAN E1) to the factor. CDI control unit (N3/9) (with diesel engine) or ME-SFI control unit Function sequence for over boost (with CODE B03 (ECO start/ (N3/10) (with gasoline engine) which reduces the engine power accordingly. If the brake booster reaches the limits of its pneumatic boost, the brake A pending shift operation is suppressed for the duration of control pressure is increased through actuation of the high pressure and intervention. return flow pump, thereby ensuring that the usual level of brake boost For this purpose, the Electronic Stability Program control unit (except is then provided. CODE 233 (DISTRONIC PLUS), except CODE 990 (AMG vehicles)) or The function sequence for fail boost and the function sequence for the Premium Electronic Stability Program control unit (with CODE 233 over boost differ in terms of their triggering thresholds and hydraulic (DISTRONIC PLUS) or with CODE 990 (AMG vehicles)) sends a boost. signal via chassis CAN 1 to the CDI control unit (with diesel engine) or the ME-SFI control unit (with gasoline engine) which sends the Function sequence - PRE-SAFE information via the drive train CAN (CAN C) to the fully integrated The PRE-SAFE function is integrated into the regenerative braking transmission control unit (Y3/8n4) (with transmission 722.9). The fully system control unit. If the regenerative braking system control unit integrated transmission control unit (with transmission 722.9) detects one of the following situations, the PRE-SAFE function is suppresses the shift operation. activated: - Panic after-braking (the driver's braking wish is greater than EBD function sequence physically possible) EBD [EBV] provides assistance when the driver applies medium force Severe oversteer (vehicle rear breaks away in combination with to the brake pedal. EBD [EBV] prevents overbraking of the rear axle powerful ESP control intervention functions) and increases vehicle stability when braking in a curve by reducing the - Severe understeer (the vehicle leans heavily over the front wheels pressure at the rear wheel on the inside of the curve or increasing it at for an extensive period)) the front wheel on the outside of the curve as required. Page 2 of 5

3 - Rapid steering movements at high speeds, which suggest a shock The side-slip angle (angle between vehicle longitudinal axis and reaction from the driver and may lead to vehicle instability direction of movement of the vehicle's center of gravity) is calculated Function sequence for cruise control (CC) using the yaw rate (speed of vehicle rotation about vertical axis). The The cruise control maintains the constant speed specified by the yaw rate, the lateral acceleration and the steer angle of the front driver, irrespective of engine load condition and without the accelerator wheels (calculated from the steering wheel angle) are used to pedal being actuated. determine the lateral forces on the wheels. The longitudinal forces on The cruise control also includes the following functions: the wheels are calculated using the engine torque, transmission stage Permanent Speed Limiter and brake pressure at each wheel. If the measured yaw rate does not match the specified value or the Variable Speed Limiter determined side-slip angle is too large, the Electronic Stability Program (except CODE 494 (USA version)) control unit (except CODE 233 (DISTRONIC PLUS), except CODE 990 (AMG vehicles)) or the Premium Electronic Stability Program Further information on the cruise control (CC) can be found in the control unit (with CODE 233 (DISTRONIC PLUS) or with CODE 990 following document: (AMG vehicles)) generates a signal to increase the brake force or to Cruise control (CC), function reduce the brake force for the corresponding wheel. The resulting Function sequence for SSK forces stabilize the vehicle. The standstill coordinator monitors the braking support systems Function sequence of exhaust test, dynamometer test mode DISTRONIC PLUS (with ABR premium system (with CODE 233 For vehicle test purposes, the ABR can be set to roller dynamometer (DISTRONIC PLUS)) and HOLD function below a speed of 3 km/h until mode if the workshop menu is activated via the instrument cluster (A1) the vehicle has come to a safe standstill. Within this vehicle speed and the engine is then started. ESP, ABS and ASR are then switched range, the SSK is responsible of the transfer to a safe state when a passive. The Electronic Stability Program warning lamp (A1e41) and securing event occurs. the antilock brake system indicator lamp (A1e17) in the instrument When the vehicle is at a safe standstill, the rolling monitoring function cluster light up. In addition, a message is displayed in the multifunction of the SSK is requested by the support systems. If vehicle rolling is display (A1p13) of the instrument cluster. The dynamometer mode can detected, the brake pressure is increased until the vehicle is stationary also be activated using the Diagnosis Assistance System (DAS). again. In the case of vehicles with ABR Premium system (with code ABS function sequence 233 (DISTRONIC PLUS)), a leakage compensation is also active ABS prevents the wheels from locking up when braking and as a result during the safe standstill. If the brake pressure measured by means of maintains the steerability and directional stability and road adhesion the circuit pressure sensors drops relative to the specified pressure during vehicle deceleration. If a locked wheel is detected by the request of the SSK, the specified pressure of the SSK is restored by Electronic Stability Program control unit (except CODE 233 means of an active pressure buildup. (DISTRONIC PLUS), except CODE 990 (AMG vehicles)) or by the Securing the vehicle by means of the SSK is necessary if the following Premium Electronic Stability Program control unit (with CODE 233 events occur: (DISTRONIC PLUS) or with CODE 990 (AMG vehicles)) on the basis Driver is detected as absent (the driver door is open and the driver of the signals from the rpm sensors, the brake pressure at the belt buckle is not fastened) corresponding brake cylinder is reduced until the wheel begins to turn Engine OFF, unless the engine is switched off by the ECO start/stop again. function Function sequence for ASR, ETS - Ignition OFF ASR and ETS prevent the drive wheels from spinning when driving. Undervoltage and overvoltage ASR and ETS also serve to provide improved directional stability and Request relevant to vehicle safety (e.g. DISTRONIC PLUS) road adhesion for increased traction potential over the entire vehicle ESP and CAN faults which result in temporary deactivation speed range. SSK monitoring that result in temporary or permanent deactivation Spinning of the drive wheels is detected via the signals from the rpm After the defined hold period of 10 min sensors by the Electronic Stability Program control unit (except CODE 233 (DISTRONIC PLUS), except CODE 990 (AMG vehicles)) or by the Premium Electronic Stability Program control unit (with CODE 233 The vehicle is secured by means of the warning strategy. The warning (DISTRONIC PLUS) or with CODE 990 (AMG vehicles)). Wheel strategy actively involves the driver in the securing procedure so that a spinning is countered by reduction of the drive torque. vehicle securing operation must take place as a result of driver action. The warning strategy is divided into 3 stages. For this purpose, the Electronic Stability Program control unit (except CODE 233 (DISTRONIC PLUS), except CODE 990 (AMG vehicles)) or the Premium Electronic Stability Program control unit (with CODE 233 Stage 1 of warning strategy (DISTRONIC PLUS) or with CODE 990 (AMG vehicles)) sends a The driver is warned by means of a message in the instrument cluster. signal to reduce the drive torque via chassis CAN 1 to the CDI control The message differs depending on the transmission model. With unit (with diesel engine) or the ME-SFI control unit (with gasoline manual transmissions, the message "Brake Immediately!" appears in engine) which reduces the engine power accordingly. the instrument cluster. On vehicles with automatic transmission, the A check is continuously performed to establish whether the drive driver is warned by the message "Gear Selector Lever to P". torque specified by the driver via the accelerator pedal sensor (B37) can be permitted again, e.g. due to an improvement in road surface Stage 2 of warning strategy adhesion. As a result of targeted brake intervention at the spinning In stage 2 of the warning strategy, the driver is additionally warned by wheel (without traction), the drive torque is transferred to the opposite means of an unobtrusive beeping which is actuated by the front SAM rotating wheel (with traction). control unit with fuse and relay module. BAS function sequence BAS detects emergency braking situations from rapid actuation of the The beeping sounds if the following events occur: brake pedal and, if necessary, increases the brake pressure in order to Engine hood OPEN achieve maximum possible deceleration. Engine OFF (unless the engine is switched off by the ECO start/stop For this purpose, the Electronic Stability Program control unit (except function), driver door OPEN and driver seat belt not fastened CODE 233 (DISTRONIC PLUS), except CODE 990 (AMG vehicles)) or Ignition OFF, driver door OPEN and driver seat belt not fastened the Premium Electronic Stability Program control unit (with CODE 233 Stage 3 of warning strategy (DISTRONIC PLUS) or with CODE 990 (AMG vehicles)) evaluates the In stage 3 of the warning strategy, a more intense beeping is output if degree of pressure rise in the brake system and, if a certain triggering the following events occur: threshold is exceeded, initiates emergency braking. attempt to lock the vehicle using the key Function sequence for BAS PLUS, with CODE 233 (DISTRONIC the beeping in stage 1 and stage 2 is output for a longer time PLUS) The beeping is stopped immediately as soon as the driver deactivates BAS Plus increases the brake pressure depending on the speed of the the active assistance system. This can be performed by engaging gear brake pedal operation and the distance of the vehicle driving in front. range "P" or by depressing the brake pedal. Function sequence for ESP trailer stabilization (with CODE 550 Door contact plausibility check (Trailer hitch)) Page 3 of 5

4 The plausibility check detects any faults along the signal path from the The ESP trailer stabilization detects rocking motion in the tractor/ left front door rotary tumbler switch (A85s1) or right front door rotary trailer combination based on the yawing vibrations caused in the tumbler switch (A85/1s1) (depending on the global country coding for tractor vehicle by the trailer. The front SAM control unit with fuse and right-hand or left-hand drive vehicle), read in by the left front door relay module (N10/1) places the information on chassis CAN 1. control unit (N69/1) or right front door control unit (N69/2) and via the This information is received by the Electronic Stability Program control interior CAN and chassis CAN 1, with the front SAM control unit with unit (except CODE 233 (DISTRONIC PLUS), except CODE 990 (AMG fuse and relay module interface to the Electronic Stability Program vehicles)) or by the Premium Electronic Stability Program control unit control unit (except CODE 233 (DISTRONIC PLUS), except CODE (with CODE 233 (DISTRONIC PLUS) or CODE 990 (AMG vehicles)). If 990 (AMG vehicles)) or Premium Electronic Stability Program control vehicle/trailer instability occurs, this is detected by the yaw rate sensor unit (with CODE 233 (DISTRONIC PLUS) or with CODE 990 (AMG for lateral and longitudinal acceleration. vehicles)). If, as the result of an electrical or mechanical fault, "Driver door closed" is wrongly detected although the driver door is open, this is detected by the door contact plausibility check in the SSK and a Premium Electronic Stability Program control unit (with CODE 233 corresponding fault is stored in the Electronic Stability Program control (DISTRONIC PLUS) or with CODE 990 (AMG vehicles)) receives this unit (except CODE 233 (DISTRONIC PLUS), except CODE 990 (AMG information via the vehicle dynamics (CAN H). vehicles)) or Premium Electronic Stability Program control unit (with CODE 233 (DISTRONIC PLUS) or with CODE 990 (AMG vehicles)). No additional sensors are used on the trailer or trailer hitch. SSK deactivation The ESP trailer stabilization stabilizes the tractor/trailer combination Deactivation of the SSK is signaled internally in the Electronic Stability by means of brake pressure requests on alternating sides of the front Program control unit (except CODE 233 (DISTRONIC PLUS), except axle and, if necessary, slows down the tractor/trailer combination by CODE 990 (AMG vehicles)) or in the Premium Electronic Stability reducing torque and by building up pressure at all wheels. Program control unit (with CODE 233 (DISTRONIC PLUS) or with The vehicle is stabilized only via the front axle. If heavy negative CODE 990 (AMG vehicles)) and externally via chassis CAN 1. An damping is detected, the system intervenes to decelerate the vehicle activation of the support systems is no longer possible. Securing of the and stabilize the trailer. If several ESP interventions occur in quick vehicle is additionally requested immediately if the SSK is deactivated succession, the simple stabilization intervention is suppressed, and a support system is active. regardless of the damping detected. This prevents the tractor/trailer Sliding and skidding combination from constantly driving at a critical speed and prevents When the vehicle is stationary, the SSK monitors whether the vehicle the brake system from being subjected to too much stress due to is sliding or skidding. Activation of the support systems is not permitted interventions in quick succession. Active vehicle/trailer stabilization during this time. The active support systems must be deactivated when does not change the critical speed. the brake pedal is depressed and the vehicle is sliding. The existing brake pressure at the wheels is reduced and the SSK Additional function requirements for the Hill Start Assist becomes inactive. Transmission not in position "N" (with transmission 722) If the intelligent servo module for DIRECT SELECT does not signal Vehicle not secured with parking brake engagement of gear range "P" within a defined time, the Emergency-P Incline detected with vehicle at standstill function of the electronic ignition lock control unit forces gear range P Hill Start Assist function sequence to be engaged. When starting off, the Hill-Start Assist prevents the vehicle from rolling back opposite the travel direction of the engaged gear range during the Steer Assist function sequence time it takes for the driver to change from the brake pedal to the The steering assistance function helps the driver to achieve an accelerator pedal. The function is triggered automatically, if when the optimum steering reaction in critical driving situations. The Steer Assist vehicle is at a standstill an incline is detected via the yaw rate sensor function is realized with the aid of the electric power steering control for lateral and longitudinal acceleration which would cause rolling in unit (N68) and by means of the Electronic Stability Program control unit the opposite direction to the gear range engaged. This is sent via the (except CODE 233 (DISTRONIC PLUS), except CODE 990 (AMG vehicle dynamics CAN to the Electronic Stability Program control unit vehicles)) or the Premium Electronic Stability Program control unit (except CODE 233 (DISTRONIC PLUS), except CODE 990 (AMG (with CODE 233 (DISTRONIC PLUS) or with CODE 990 (AMG vehicles)) or the Premium Electronic Stability Program control unit vehicles)). (with CODE 233 (DISTRONIC PLUS) or with CODE 990 (AMG vehicles)). The following functions are performed here: In addition, the Electronic Stability Program control unit (except CODE Driver support through countersteering for a vehicle with oversteer Driver support when braking on alternating road surfaces Premium Electronic Stability Program control unit (with CODE 233 The current driving status is acquired by the Electronic Stability (DISTRONIC PLUS) or with CODE 990 (AMG vehicles)) also reads in Program control unit (except CODE 233 (DISTRONIC PLUS), except the brake light switch directly and thus detects the status of the brake CODE 990 (AMG vehicles)) or by the Premium Electronic Stability pedal. Program control unit (with CODE 233 (DISTRONIC PLUS) or with CODE 990 (AMG vehicles)). If necessary, the message "Steering The status of the parking brake is detected via the parking brake assistance request" is sent via chassis CAN 1 and chassis CAN 2 with indicator switch (S12). This switch is read in by the front SAM control the front SAM control unit with fuse and relay module interface to the unit with fuse and relay module directly and its status is sent via electrical power steering control unit which actuates the electric power chassis CAN 1 to the Electronic Stability Program control unit (except steering actuator motor (A91m1) accordingly. CODE 233 (DISTRONIC PLUS), except CODE 990 (AMG vehicles)) or the Premium Electronic Stability Program control unit (with CODE 233 Additional function requirements for adaptive brake lights (DISTRONIC PLUS) or with CODE 990 (AMG vehicles)). flashing (except with code 494 (USA version)) The brake pressure applied by the driver is maintained in the brake Vehicle speed > 50 km/h cylinders by the traction system hydraulic unit (A7/3). Deceleration 7.5 m/s² Once the brake pedal is released, the brake pressure is modulated BAS activated based on the downward torque due to slope, braking torque and drive ABS controls both front wheels torque. Once there is sufficient starting torque, the function is Function sequence for adaptive brake lights flashing (except with deactivated and the vehicle drives off. However, if the driver does not code 494 (USA version)) actuate the accelerator pedal, the pressure in the brake cylinders is released after t = 1 s. In the event of emergency braking, the Electronic Stability Program control unit sends a corresponding signal via chassis CAN 1 to the front SAM control unit with fuse and relay module. The front SAM Additional function requirements - dry braking control unit with fuse and relay module forwards this via the interior No brake intervention by a control system CAN (CAN B) to the rear SAM control unit with fuse and relay module Speed v > 30 km/h (N10/2). The rear SAM control unit with fuse and relay module then Number of wiper cycles > 600 Page 4 of 5

5 actuates the brake lights with a flashing frequency of 5 Hz for the duration of the signal (min. 1 s). The status of the wiper system is sent by the front SAM control System fault display function sequence unit with fuse and relay module via chassis CAN 1 to the Electronic The driver is informed about the system status and about faults by the Stability Program control unit (except CODE 233 (DISTRONIC PLUS), following displays: except CODE 990 (AMG vehicles)) or the Premium Electronic Stability - Antilock brake system indicator lamp (A1e17) Program control unit (with CODE 233 (DISTRONIC PLUS) or with - Electronic Stability Program warning lamp CODE 990 (AMG vehicles)). - Messages in multifunction display (A1p13) Dry braking function sequence Brake fluid and parking brake indicator lamp (A1e6) Dry braking enhances the performance of the brakes on the front axle in wet driving conditions. The brake pads are applied cyclically for t = If the Electronic Stability Program control unit (except CODE s with a brake pressure p = 1 bar to remove the film of water from the brake disk. This improves the response time of the brake. Premium Electronic Stability Program control unit (with CODE 233 In order to adapt the calculated triggering threshold of the accelerator pedal gradient to driver behavior, a learning algorithm is implemented which places the driver in the category "normal driver" or "hectic driver" on the basis of the average rate at which the accelerator pedal is released. (DISTRONIC PLUS) or with CODE 990 (AMG vehicles)) fails, basic braking without ABS is always available. The status of the brake fluid level switch (S11) and the parking brake indicator switch is read by the front SAM control unit with fuse and relay module and sent via the interior CAN (CAN B) to the instrument cluster. Function sequence for precharging depending on accelerator In the function sequence for semi-automatic parking space entry pedal actuation (except CODE 489 (Japan version)) and the function sequence for Upon detection of a possible emergency braking situation, the brake semi-automatic parking space exit (except CODE 489 (Japan pads are brought into contact with the brake disks. The clearance version)), the Electronic Stability Program control unit (except CODE between the brake pad and brake disk is thus compensated before the 233 driver operates the brake. Premium Electronic Stability Program control unit (with CODE 233 The response time of the brake is improved and a shorter braking (DISTRONIC PLUS) or with CODE 990 (AMG vehicles)) receives the distance can be achieved. required braking torque from the parking system control unit (N62) Emergency braking is detected from the release gradient of the (with CODE 235 (Active Parking Assist) via chassis CAN 1 and chassis accelerator pedal, which is formed from the accelerator pedal position. CAN 2 with the front SAM control unit with fuse and relay module If a rapid release of the accelerator pedal is detected, the system interface and actuates the traction system hydraulic unit directly. The assumes that the driver intends to brake. The function is activated and vehicle is braked. The vehicle is braked to stop at the required a brake pressure of p = 2 to 3 bar is requested. maneuvering points as well as an in the target parking position. Function sequence for precharging depending on lateral acceleration During dynamic cornering, the brake pads are brought into contact with the front axle brake disks. This closes the air gap between the brake pad and brake disk in order to achieve the required braking power at the corresponding wheel as quickly as possible in the event of ESP intervention by the brake system. Function sequence for HOLD function The HOLD function assists the driver during waiting times in traffic and when starting off on a hill. The HOLD function is activated by briefly and quickly depressing the brake pedal when the vehicle is stationary. Successful activation of the HOLD function is indicated in a status line in the instrument cluster. The HOLD function can be activated if: the vehicle is stationary the seat belt is fastened or the driver door is closed the selector lever is not in position "P" Electrical function schematic for Adaptive Brake (ABR) Adaptive Brake (ABR) location of components Adaptive Brake (ABR) block diagram Overview of system components, Adaptive Brake (ABR) PE42.47-P DAB GF42.47-P FLM GF42.47-P FLM GF42.47-P-9997FL Page 5 of 5