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VDA_305-100-integrating-actuators-of-electric-parking-brakes-esc.pdf

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VDA_305 100 INTEGRATING ACTUATORS OF ELECTRIC PARKING BRAKES ESC
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Recommendation for Integrating Actuators of Electric Parking Brakes into ESC Control Units VDA 305-100 This non-binding recommendation by the German Association of the Automotive Industry has the following objective: Definition of a technical standard for integrating the electronic parking brake actuator into the ESC (Electronic Stability Control) system, regarding the ESC (ESC Assy) and the brake caliper (Brake Assy) Publisher: Verband der Automobilindustrie; Behrenstrasse 35; 10117 Berlin; www.vda.de ? 2015 Verband der Automobilindustrie, Berlin VDA Recommendation 305-100 Version August 2014 Page 2 Copyright: VDA 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. VDA recommendations represent the latest technology 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. 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. VDA Recommendation 305-100 Version August 2014 Page 3 Copyright: VDA 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 1.3 Procedure .............................................................................................................. 7 2 System description ....................................................................................................... 8 2.1 Requirements for an electric parking brake in relation to integration ................... 10 2.2 Division into Brake Assy and HOST .................................................................... 10 2.3 Scope of Brake Assy and PBC component ......................................................... 10 2.4 Scope of the HOST, including EPB specific SSM components ........................... 11 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 3.2.3.1 Interface description .............................................................................. 30 3.2.3.2 Hydraulic pressure support interface requirements ............................... 31 3.2.4 PbcOutOutOfSpecMsg support interface ........................................................ 32 3.2.4.1 Interface description .............................................................................. 32 3.2.4.2 PbcOutOutOfSpecMsg interface requirements ..................................... 32 3.2.5 Environmental Data Interface ......................................................................... 33 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 3.2.8.1 Interface description .............................................................................. 41 3.2.8.2 System mode management requests ................................................... 42 3.2.8.3 Initialization and cyclical operation ........................................................ 42 3.2.8.4 General requirements and definitions: .................................................. 43 3.2.9 Fault management interface ........................................................................... 43 3.2.9.1 Interface description .............................................................................. 44 VDA Recommendation 305-100 Version August 2014 Page 4 Copyright: VDA 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. ASIL D) ............................................................................................................. 58 4.1.2 Unintended braking torque while vehicle is stationary (max. QM) .................. 59 4.1.3 Too low braking torque while vehicle is stationary (max. ASIL C) ................... 59 4.1.4 Incorrect driver information (max. ASIL A) ...................................................... 60 4.2 Classification of relevant signals and sub-functions ............................................ 61 4.3 Hardware ............................................................................................................. 63 4.4 PBC software integration ..................................................................................... 63 4.5 System integration ............................................................................................... 63 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 Test concept ............................................................................................................... 70 6.1 Test strategy ....................................................................................................... 70 6.1.1 Verification ...................................................................................................... 71 6.1.2 Validation ........................................................................................................ 71 6.1.3 Test stages ..................................................................................................... 72 6.1.4 General explanations and determination of the test strategy .......................... 72 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 VDA Recommendation 305-100 Version August 2014 Page 5 Copyright: VDA 8.1 Objective ............................................................................................................. 80 8.2 Structure of the RASI matrix ................................................................................ 80 8.3 RASI matrix ......................................................................................................... 80 9 Regulations and standards ......................................................................................... 90 10 Glossary ..................................................................................................................... 91 11 Annex ......................................................................................................................... 93 11.1 ANNEX 3.2.A1: Interface Details (Functional View) ............................................ 93 11.2 ANNEX 3.2.A2: Interface details (Software view) .............................................. 102 12 Change Overview ..................................................................................................... 108 VDA Recommendation 305-100 Version August 2014 Page 6 Copyright: VDA 1 Introduction 1.1 Integration of the EPB control unit into the ESC An electric parking brake (EPB) consists of: ? the parking brake actuators to generate the force necessary for holding the vehicle in position, ? an electronic control unit (ECU) containing the EPB function software, activation of the parking brake actuators and the associated hardware. In addition to the independent EPB control unit, it is possible to integrate the control unit into the electronic stability control (ESC) system. To date, OES specific solutions have been used to integrate the EPB ECU into the control unit of the ESC. OES independent combination of ESC and EPB will require definitions of the shares supplied by the relevant suppliers, of the responsibilities involved, and of the interface between EPB and ESC within the ECU. 1.2 Content of this document VDA recommendation 305-100 describes the integration of the activation of caliper integrated parking brake actuators into an ESC control unit from a different manufacturer. This VDA recommendation describes: ? the scopes of supply of the OES of the EPB and of the ESC ? the responsibilities and the associated procedure ? the functional architecture ? the interface with the necessary detailed information ? the coverage of functional safety aspects The content of this recommendation has been selected such that the constraints permit combining EPB and ESC from different suppliers witho
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