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VDA
Recommendation for the implementation of a
communication interface between an electrical brake
booster and an ESC control unit
360
This non-binding recommendation by the German Association of the Automotive Industry
(VDA) has the following objectives:
Definition and description for the communication interface between an electrical
brake
booster and an ESC control unit to simplify the cooperation between different suppliers
(OES) of the active brake booster and the ESC.
Area of applicability of this recommendation is defined as follows:
Applicability according to ECE-R13H: vehicl
e categories M1 (“passenger cars”) und N1
(cars / trucks for transportation) with gross vehicle weight up to 3.5 t
Version 1.0 from December, 2016
Project group VDA interface eBooster ESC
Publisher: Verband der Automobilindustrie Copyright
Behrenstrasse 35
Reprints and any other form
10117 Berlin of duplication are permitted only
Tel. 030/897842-0 if the source is cited.
Fax 030/897842-606
Internet: www.vda.de

VDA recommendation 360 Version 1.0 December 2016 Page 2
Copyright: VDA
Disclaimer
VDA recommendations are freely available and are intended as advice only. They offer
orientation for all interested companies, but do not take into consideration any general
conditions for specific cases. They have to be interpreted by the business partners
involved in the processes.
VDA recommendations represent the latest technology and standardization level at the
time of issue. Application of VDA recommendations does not relieve the users of
responsibility for their own actions. In this regard, all users act at their own risk. The
VDA and those involved with VDA recommendations do not accept any liability.
Anyone applying VDA recommendations who identifies inaccuracies or discrepancies
is requested to inform the VDA and become involved in the continuing standardization
process.
User of this Recommendation are asked to report to VDA any intellectual property
rights that could be problematic for the current recommendation.
VDA has been notified about the existence of intellectual property rights which could
be relevant for implementations of the current recommendation. VDA asks owners of
the respective intellectual property rights to submit a declaration, that they are ready
to grant to any user a license to the respective intellectual property rights under FRAND
conditions, provided that the user interested in such a license is ready to grant a license
to his intellectual property rights which relate to the Recommendation under FRAND
conditions as well. Information about who has submitted such a declaration may be
obtained at VDA.

VDA recommendation 360 Version 1.0 December 2016 Page 3
Copyright: VDA
Contents
Disclaimer .................................................................................................................. 2
Contents ..................................................................................................................... 3
1 Introduction ........................................................................................................... 9
1.1 Brake system definition (definition of the system limits) ................................ 9
1.2 Content of this document .............................................................................. 9
2 System description ............................................................................................. 11
2.1 Description of the system components ........................................................ 11
2.2 Concepts in the system network eBooster + ESC ....................................... 14
2.2.1 Degradation concept ............................................................................... 14
2.2.2 HMI concept ............................................................................................ 15
2.2.3 Brake light actuation concept .................................................................. 21
2.2.4 Driver brake request detection concept .................................................. 23
2.2.5 Concept for external brake request via eBooster .................................... 24
2.2.6 OBD concept .......................................................................................... 25
2.2.7 Wakeup/ postrun concept ....................................................................... 26
2.2.7.1 Wakeup ......................................................................................... 26
2.2.7.2 Postrun.......................................................................................... 27
2.2.8 Undervoltage/overvoltage concept ......................................................... 28
2.2.8.1 Separate assessment for the brake force boost ............................ 28
2.2.8.2 Engine start ................................................................................... 29
2.2.8.3 Engine start with start/stop functionality ........................................ 29
2.2.8.4 Electrical interface ......................................................................... 30
2.2.9 Diagnosis concept .................................................................................. 31
2.2.10 Component protection in the eBooster ................................................... 32
2.3 Division of functions between eBooster + ESC ........................................... 34
2.4 Derived requirements for the subsystems ................................................... 36
2.4.1 Requirements for the ESC ...................................................................... 36
2.4.2 Requirements for the eBooster ............................................................... 37
2.4.3 Requirements for the HMI ....................................................................... 38
2.4.4 Requirements for the generator .............................................................. 39
2.5 Notes on the system specification ............................................................... 39

VDA recommendation 360 Version 1.0 December 2016 Page 4
Copyright: VDA
2.5.1 Complete brake system design ............................................................... 39
2.5.2 Load specifications ................................................................................. 40
2.5.2.1 Impacts on the ESC standard functions ........................................ 40
2.5.2.2 eBooster load changes ................................................................. 40
2.5.2.3 Deriving the load for a regenerative brake system ........................ 40
3 Basic functional architecture ............................................................................... 41
3.1 Definition of a functional architecture .......................................................... 41
3.2 Interface definition ....................................................................................... 45
3.2.1 Basic interface: The basic functionality ................................................... 46
3.2.1.1 Overview interface description ...................................................... 47
3.2.1.2 Signal eBESCCompatibilityIndex .................................................. 49
3.2.1.3 Signal HbcRequest ....................................................................... 50
3.2.1.4 Signal eBDiagActive ..................................................................... 51
3.2.1.5 Signal BrakePedalApplied ............................................................. 52
3.2.1.6 Signal BrakePedalApplied_Q ........................................................ 53
3.2.1.7 Signal pRunout ............................................................................. 53
3.2.1.8 Signal pRunout_Q ......................................................................... 54
3.2.1.9 Signal sOutputRodDriver .............................................................. 55
3.2.1.10 Signal sOutputRodDriver_Q .......................................................... 56
3.2.1.11 Signal VehicleSpeed ..................................................................... 57
3.2.1.12 Signal VehicleSpeed_Q ................................................................ 58
3.2.1.13 Signal pMC1 ................................................................................. 58
3.2.1.14 Signal pMC1_Q ............................................................................. 59
3.2.1.15 Signal AbsActive ........................................................................... 60
3.2.1.16 Signal pEstMax ............................................................................. 61
3.2.2 Recuperation interface ............................................................................ 62
3.2.2.1 Overview interface description ...................................................... 63
3.2.2.2 Signal pForceBlendingPotential .................................................... 64
3.2.2.3 Signal pForceBlendingPotential_Q ............................................... 64
3.2.2.4 Signal sOutputRodAct ................................................................... 65
3.2.2.5 Signal sOutputRodAct_Q .............................................................. 66
3.2.2.6 Signal pMcVirtual .......................................................................... 67
3.2.2.7 Signal pMcVirtual_Q ..................................................................... 67

VDA recommendation 360 Version 1.0 December 2016 Page 5
Copyright: VDA
3.2.2.8 Signal pForceBlendingMC ............................................................ 68
3.2.2.9 Signal pForceBlendingMC_Q ........................................................ 69
3.2.2.10 Signal ForceBlendingActive .......................................................... 70
3.2.3 Interface for external brake request ........................................................ 71
3.2.3.1 Overview interface description ...................................................... 72
3.2.3.2 Signal ExtReqPrio ......................................................................... 73
3.2.3.3 Signal ExtReqStatus ..................................................................... 73
3.2.3.4 Signal qTargetExternal.................................................................. 74
3.2.3.5 Signal qTargetExternal_Q ............................................................. 75
3.2.4 Interface for activating the warning lights (HMI) ...................................... 76
3.2.4.1 Overview interface description ...................................................... 76
3.2.4.2 eB_ HMI_WarningOn .................................................................... 77
3.2.4.3 ESC_HMI_WarningOn .................................................................. 78
3.2.5 Interface for activating the brake light (BLA) ........................................... 79
3.2.5.1 Overview interface description ...................................................... 79
3.2.5.2 eB_BLA ......................................................................................... 80
3.2.5.3 ESC_BLA ...................................................................................... 81
3.2.6 Interface for generator actuation ............................................................. 82
3.2.6.1 Overview interface description ...................................................... 83
3.2.6.2 RecuBrakeTorqueRequest ............................................................ 84
3.2.6.3 RecuBrakeTorqueRequest_Q ....................................................... 85
3.2.6.4 RecuBrakeTorqueCap .................................................................. 86
3.2.6.5 RecuBrakeTorqueCap_Q .............................................................. 87
3.2.6.6 RecuBrakeTorqueAct .................................................................... 87
3.2.6.7 RecuBrakeTorqueAct_Q ............................................................... 88
3.2.6.8 RecuBrakeTorqueActDrag ............................................................ 89
3.2.6.9 RecuBrakeTorqueActDrag_Q ....................................................... 89
3.2.7 Handling of signal qualifiers .................................................................... 91
4 Functional safety ................................................................................................ 93
4.1 Definition of the scope of a brake control system ........................................ 93
4.1.1 Motivation for dividing the brake control system into two items .............. 93
4.1.2 Item definition and interfaces to other items ........................................... 95
4.2 Hazards and risks of the brake control system ............................................ 96
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