VDA305 集成EParking到ESC的推荐标准含ISO26262功能安全分析

Recommendation for Integrating Actuators

of Electric Parking Brakes into ESC Control Units

VDA

305-100

into the ESC (Electronic Stability Control) system, regarding the ESC (ESC Assy) and

the brake caliper (Brake Assy)

Disclaimer

VDA recommendations are freely available. 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.

standardization process.

Attention is drawn to the possibility that some of the elements of this document may

be the subject of patent rights (or other intellectual property rights) without those

identified before. The VDA is not responsible for identifying any or all such patent

rights. The users of this recommendation are requested to inform the VDA, about

proprietary rights that may concern this recommendation.

Table of Contents

1 Introduction ................................................................................................................... 6

1.1 Integration of the EPB control unit into the ESC .................................................... 6

1.2 Content of this document ...................................................................................... 6

3 Basic functional architecture ....................................................................................... 13

3.1 Definition of a functional architecture .................................................................. 13

3.1.1 General requirements and definitions: ............................................................ 19

3.1.2 HOST Safety Barrier ....................................................................................... 21

3.1.2.1 General requirements and definitions: .................................................. 21

3.1.3 Parameter file (PBC-ParamFile) ..................................................................... 23

3.2 SW Interface definition ........................................................................................ 23

3.2.1 Actuation request interface ............................................................................. 23

3.2.1.1 Interface description .............................................................................. 24

3.2.1.2 Actuation request interface requirements.............................................. 25

3.2.2 Actuator control interface ................................................................................ 27

3.2.2.1 Interface description .............................................................................. 27

3.2.2.2 Actuator control requirements ............................................................... 29

3.2.3 Hydraulic pressure support interface .............................................................. 30

3.2.5.1 Interface description .............................................................................. 33

3.2.5.2 Environmental Data Interface requirements .......................................... 34

3.2.6 Diagnostic interface ........................................................................................ 35

3.2.6.1 Interface description .............................................................................. 35

3.2.6.2 Diagnostic interface requirements ......................................................... 38

3.2.7 Data storage interface..................................................................................... 38

3.2.7.1 Interface description .............................................................................. 39

3.2.7.2 Logical structure of memory .................................................................. 40

3.2.7.3 Data storage interface requirements ..................................................... 40

3.2.8 System mode management ............................................................................ 41

3.2.9.2 Fault management requirements .......................................................... 44

3.2.10 Development message interface .................................................................... 45

3.2.10.1 Interface description .............................................................................. 45

3.2.10.2 Development message requirements ................................................... 45

3.2.11 Parking support interface ................................................................................ 46

3.2.11.1 Interface description .............................................................................. 46

3.2.11.2 Parking support interface requirements ................................................ 46

3.3 Park brake hardware (HW) (driver stage of parking brake actuator,

measurements, required computing capacity) ............................................................ 47

3.3.1 Definition of and requirements for the parking brake electronic HW ............... 47

3.3.2 Definition of nominal load cases relevant to circuit design .............................. 49

3.3.3 Definition of borderline load cases relevant to circuit design .......................... 54

4 Functional safety ........................................................................................................ 58

4.1 Hazards and risks relevant to the EPB ................................................................ 58

4.1.1 Too high or unintended braking torque while vehicle is in motion (max.

4.1.2 Unintended braking torque while vehicle is stationary (max. QM) .................. 59

5 Proof of safety in interchangeability ............................................................................ 64

5.1 FMEA – responsibilities, interface coordination ................................................... 64

5.1.1 General conditions .......................................................................................... 64

5.1.2 FMEA structure ............................................................................................... 64

5.1.3 Handling information at the interface between the FMEAs ............................. 66

5.2 PMHF according to ISO 26262 ........................................................................... 67

5.2.1 General conditions .......................................................................................... 67

5.2.2 Evaluation ....................................................................................................... 67

5.2.3 Division of failure rates between various causes ............................................ 68

5.2.4 Evaluation procedure ...................................................................................... 68

6.1.5 Precondition for the components and system tests ........................................ 72

6.1.6 Test activities .................................................................................................. 73

6.1.6.1 Test activities of the Brake Assy OES ................................................... 73

6.1.6.2 Test activities of the ESC OES ............................................................. 75

6.1.6.3 Approval recommendation for the entire scope of supply ..................... 76

6.1.6.4 Stimulation matrix ................................................................................. 76

7 Handling of faulty parts ............................................................................................... 78

8 Cooperation matrix (RASI matrix) ............................................................................... 80

8.1 Objective ............................................................................................................. 80

8.2 Structure of the RASI matrix ................................................................................ 80

12 Change Overview ..................................................................................................... 108