VDA-360recommendation_360_Interface_ESC_eBooster_V1_vda360中文版

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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 3

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

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

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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