PhaDiscnct_MDD

Module Design Document

For

PhaDiscnct

February 16, 2018

Prepared For:

Software Engineering

Nexteer Automotive,

Saginaw, MI, USA

Prepared By:

Software Group,

Nexteer Automotive,

Saginaw, MI, USA
Change History

Table of Contents

1 Introduction 4

1.1 Purpose 4

1.2 Scope 4

2 PhaDiscnct & High-Level Description 5

3 Design details of software module 6

3.1 Graphical representation of PhaDiscnct 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: PhaDiscnctInit1 8

5.1.2 Per: PhaDiscnctPer1 8

5.1.3 Per: PhaDiscnctPer2 8

5.2 Server Runables 8

5.3 Interrupt Functions 9

5.4 Module Internal (Local) Functions 9

5.4.1 Local Function PerformDiag 9

5.4.2 Local Function ClosingStateBody 9

5.4.3 Local Function ClosedStateBody 10

5.4.4 Local Function OpeningStateBody 10

5.4.5 Local Function OpenedStateBody 10

5.4.6 Local Function SetHwPhaDiscnctIO 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

MDD for ES330A_PhaDiscnct_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.

PhaDiscnct & High-Level Description

Phase Disconnect provides mechanism of disconnecting Motor Phases from system in order to prevent generation of unintended negative or positive motor torque. Phase Disconnect is controlled by System State and Motor Control Gate Driver FET fault signals. Phase Disconnect functionality provides support for loss of assist mitigation.

Design details of software module

Graphical representation of PhaDiscnct

Data Flow Diagram

Refer FDD

Component level DFD

Refer FDD

Function level DFD

Refer FDD

Constant Data Dictionary

Program (fixed) Constants

Embedded Constants

Local Constants

Software Component Implementation

Sub-Module Functions

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

Per: PhaDiscnctPer2

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 PerformDiag

Design Rationale

Refer FDD

Processing

Refer FDD

Local Function ClosingStateBody

Design Rationale

Refer FDD

Processing

Refer FDD

Local Function ClosedStateBody

Design Rationale

Refer FDD

Processing

Refer FDD

Local Function OpeningStateBody

Design Rationale

Refer FDD

Processing

Refer FDD

Local Function OpenedStateBody

Design Rationale

Refer FDD

Processing

Refer FDD

Local Function SetHwPhaDiscnctIO

Design Rationale

Refer FDD

Processing

Refer FDD

GLOBAL Function/Macro Definitions

None

Known Limitations with Design

None

UNIT TEST CONSIDERATION

None

Abbreviations and Acronyms

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

References