LimrCdng_MDD

Module Design Document

For

LimrCdng

July 22, 2015

Prepared For:

Software Engineering

Nexteer Automotive,

Saginaw, MI, USA

Prepared By:

Nick Saxton,

Nexteer Automotive,

Saginaw, MI, USA
Change History

Table of Contents

1 LimrCdng High-Level Description 4

2 Design details of software module 5

2.1 Graphical representation of LimrCdng 5

2.2 Data Flow Diagram 5

2.2.1 Component level DFD 5

2.2.2 Function level DFD 5

3 Constant Data Dictionary 6

3.1 Program (fixed) Constants 6

3.1.1 Embedded Constants 6

4 Software Component Implementation 7

4.1.1 Sub-Module Functions 7

4.1.2 Interrupt Service Routines 7

4.1.3 Server Runnable Functions 7

4.1.4 Module Internal (Local) Functions 7

4.1.5 Transition Functions 7

5 Known Limitations with Design 8

6 UNIT TEST CONSIDERATION 9

Appendix A Abbreviations and Acronyms 10

Appendix B Glossary 11

Appendix C References 12

LimrCdng High-Level Description

This function provides a layer of protection from erroneous signals feeding into SF04 Sum & Limit. It is applied primarily to limiting signals that serve to reduce motor torque command under certain operating conditions. This function can prevent step response or toggling behavior that might cause undesirable vehicle feel. It includes fault injection capability at some inputs to facilitate tuning.

Design details of software module

Refer FDD

Graphical representation of LimrCdng

Data Flow Diagram

Refer FDD

Component level DFD

N/A

Function level DFD

N/A

Constant Data Dictionary

Program (fixed) Constants

Embedded Constants

Local Constants

Refer .m file

Software Component Implementation

Sub-Module Functions

Initialization sub-module {_Init()}

None

Periodic sub-module {LimrCdngPer1}

Refer FDD

Interrupt Service Routines

None

Server Runnable Functions

None

Module Internal (Local) Functions

None

Transition Functions

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