BmwStReqMgr_MDD

Module Design Document

For

BmwStReqMgr

May 22, 2018

Prepared By:

Software Group,

Nexteer Automotive,

Saginaw, MI, USA
Change History

Description	Author	Version	Date
Initial Version	Krzysztof Byrski	1	24-Oct-2017
Update to FDD 2.0.0	Mateusz Bartocha	2	14-Nov-17
Updated Diagram	Matthew Leser	3	10-Jan-18
Updated TargetECUState function inputs	Matthew Leser	4	23-Feb-18
Updated local functions	Krzysztof Byrski	5	22-Mar-2018
Update to FDD 4.0.0	Krzysztof Byrski	6	22-May-2018

Table of Contents1 Introduction 4

1.1 Purpose 4

1.2 Scope 4

2 BmwStReqMgr & High-Level Description 5

3 Design details of software module 6

3.1 Graphical representation of BmwStReqMgr 6

3.2 Data Flow Diagram 6

3.2.1 Component level DFD 6

3.2.2 Function level DFD 6

4 Constant Data Dictionary 7

4.1 Program (fixed) Constants 7

4.1.1 Embedded Constants 7

5 Software Component Implementation 8

5.1 Sub-Module Functions 8

5.1.1 Init: BmwStReqMgrInit1 8

5.1.2 Per: BmwStReqMgrPer1 8

5.2 Server Runables 8

5.3 Interrupt Functions 8

5.4 Module Internal (Local) Functions 9

5.4.1 Local Function Override 9

5.4.2 Local Function CalcOfStsSteerAssiAndEpsFctSts 9

5.4.3 Local Function StsDrvrActvyTmr 10

5.4.4 Local Function AssiOnToOffFlg 10

5.4.5 Local Function AllwToOff 11

5.4.6 Local Function TargetECUState 11

5.5 GLOBAL Function/Macro Definitions 12

6 Known Limitations with Design 13

7 UNIT TEST CONSIDERATION 14

Appendix A Abbreviations and Acronyms 15

Appendix B Glossary 16

Appendix C References 17

Introduction

Purpose

Module Design Document for CF069A_BmwStReqMgr_Impl

Scope

The following definitions are used throughout this document:

Shall: indicates a mandatory requirement without exception in compliance.
Should: indicates a mandatory requirement; exceptions allowed only with documented justification.
May: indicates an optional action.

BmwStReqMgr & High-Level Description

This function will be responsible for requesting transitions between the states and modes of the steering system based on vehicle signals.

Design details of software module

Graphical representation of BmwStReqMgr

Data Flow Diagram

Refer FDD

Component level DFD

None

Function level DFD

None

Constant Data Dictionary

Program (fixed) Constants

Embedded Constants

Local Constants

Constant Name	Resolution	Units	Value
-

*Refer FDD for local constants

Software Component Implementation

Sub-Module Functions

The sub-module functions are grouped based on similar functionality that needs to be executed in a given “State” of the system (refer States and Modes). For a given module, the MDD will identify the type and number of sub-modules required. The sub-module types are described below.

Init: Init1

Design Rationale

Refer FDD

Module Outputs

Refer FDD

Per: Per1

Design Rationale

Refer FDD

Store Module Inputs to Local copies

Refer FDD

(Processing of function)………

Refer FDD

Store Local copy of outputs into Module Outputs

Refer FDD

Server Runables

None

Interrupt Functions

None

Module Internal (Local) Functions

Local Function Override

Function Name	Override	Type	Min	Max
Arguments Passed	BmwVehCdnVld_Cnt_T_logl	boolean	FALSE	TRUE
	BmwVehCdn_Cnt_T_enum	enum	1	15
Return Value	BmwVehCdnVld_Cnt_T_logl	boolean	FALSE	TRUE
	BmwVehCdn_Cnt_T_enum	enum	1	15

Design Rationale

Refer FDD

Processing

Implementation of Simulink block Override

Local Function CalcOfStsSteerAssiAndEpsFctSts

Function Name	CalcOfStsSteerAssiAndEpsFctSts	Type	Min	Max
Arguments Passed	SysSt_Cnt_T_enum	enum	0	3
	ThermRednFac_Uls_T_f32	float32	0	1
	RcvrlFltPrsnt_Cnt_T_logl	boolean	FALSE	TRUE
	DiagcStsNonRcvrlReqDiFltPrsnt_Cnt_T_logl	boolean	FALSE	TRUE
	PwrLimrRednFac_Uls_T_f32	float32	0	1
Return Value	StsSteerAssi_Cnt_T_enum	enum	0	1
	BmwEpsFctSts_Cnt_T_enum	enum	96	224

Design Rationale

Refer FDD

Processing

Implementation of Simulink block DeterminationOfStatusSteeringAssistAndEpsFctSts

Local Function StsDrvrActvyTmr

Function Name	StsDrvrActvyTmr	Type	Min	Max
Arguments Passed	HwTq_HwNwtMtr_T_f32	float32	-10	10
Return Value	StsDrvrActvy_Cnt_T_enum	enum	0	1

Design Rationale

Refer FDD

Processing

Implementation of Simulink block StsDrvrActvyTmr

Local Function AssiOnToOffFlg

Function Name	AssiOnToOffFlg	Type	Min	Max
Arguments Passed	DiagcStsNonRcvrlReqDiFltPrsnt_Cnt_T_logl	boolean	FALSE	TRUE
	BmwVehCdnVld_Cnt_T_logl	boolean	FALSE	TRUE
	BmwVehSpdSts_Cnt_T_enum	enum	1	15
	VehSpd_Kph_T_f32	float32	0	350
	BmwVehCdn_Cnt_T_enum	enum	1	15
	StsDrvrActvy_Cnt_T_enum	enum	0	1
Return Value	AssiOnToOffFlg_Cnt_T_logl	boolean	FALSE	TRUE

Design Rationale

Refer FDD

Processing

Implementation of Simulink block AssiOnToOffFlg

Local Function AllwToOff

Function Name	AllwToOff	Type	Min	Max
Arguments Passed	BmwVehCdn_Cnt_T_enum	enum	1	15
	IgnLine_Cnt_T_logl	boolean	FALSE	TRUE
Return Value	AllwToOff_Cnt_T_logl	boolean	FALSE	TRUE

Design Rationale

Refer FDD

Processing

Implementation of Simulink block AllwToOff

Local Function TargetECUState

Function Name	TargetECUState	Type	Min	Max
Arguments Passed	DiagcStsNonRcvrlReqDiFltPrsnt_Cnt_T_logl	enum	FALSE	TRUE
	BmwVehCdn_Cnt_T_enum	enum	1	15
	AssiOnToOffFlg_Cnt_T_logl	boolean	FALSE	TRUE
	AllwTranToDi_Cnt_T_logl	boolean	FALSE	TRUE
	IgnLine_Cnt_T_logl	boolean	FALSE	TRUE
	AllwToOff_Cnt_T_logl	boolean	FALSE	TRUE
Return Value	TarEcuSt_Cnt_T_enum	enum	0	3
	PwrSplyEnaReq_Cnt_T_logl	boolean	FALSE	TRUE
	SysStReqEna_Cnt_T_logl	boolean	FALSE	TRUE
	SysOperMotTqCmdSca_Uls_T_f32	float	0	1

Design Rationale

Refer FDD

Processing

Implementation of Simulink block TargetECUState

GLOBAL Function/Macro Definitions

None

Known Limitations with Design

None

UNIT TEST CONSIDERATION

None

Abbreviations and Acronyms

Abbreviation or Acronym	Description
FDD	Functional Design Document. (See references)

Glossary

Note: Terms and definitions from the source “Nexteer Automotive” take precedence over all other definitions of the same term. Terms and definitions from the source “Nexteer Automotive” are formulated from multiple sources, including the following:

ISO 9000
ISO/IEC 12207
ISO/IEC 15504
Automotive SPICE® Process Reference Model (PRM)
Automotive SPICE® Process Assessment Model (PAM)
ISO/IEC 15288
ISO 26262
IEEE Standards
SWEBOK
PMBOK
Existing Nexteer Automotive documentation

Term	Definition	Source
MDD	Module Design Document
DFD	Data Flow Diagram

References

Ref. #	Title	Version
1	AUTOSAR Specification of Memory Mapping (Link:AUTOSAR_SWS_MemoryMapping.pdf)	v1.4.0 R4.0 Rev 3
2	MDD Guideline EA4	1.02
3	EA4 Software Naming Conventions	1.01
4	Software Design and Coding Standards	2.01
5	CF069A_BmwStReqMgr_Design	See Synergy Sub Project Version

Last modified October 12, 2025: Initial commit (af72ad2)