EcuTMeas_MDD

Module Design Document

For ECU Temperature Measurement

VERSION: 2.0

DATE: 21-MAR-2016

Prepared By:

Krishna Anne,

Nexteer Automotive,

Saginaw, MI, USA

Revision History

Table of Contents

1 Abbrevations And Acronyms 5

2 References 6

3 Ecutmeas & High-Level Description 7

4 Design details of software module 8

4.1 Graphical representation of Ecutmeas 8

4.2 Data Flow Diagram 8

4.2.1 Module level DFD 8

4.2.2 Sub-Module level DFD 8

4.3 COMPONENT FLOW DIAGRAM 8

5 Constant Data Dictionary 9

5.1.1.1 9

5.1.2 Module specific Lookup Tables Constants 9

6 Software Module Implementation 10

6.1 Sub-Module Functions 10

6.1.1 Initialization Functions 10

6.1.1.1 INIT: EcuTMeasINIT1 10

6.1.1.2 Design Rationale 10

6.1.1.3 Store Module Inputs to Local copies 10

6.1.1.4 (Processing of function)……… 10

6.1.1.5 Store Local copy of outputs into Module Outputs 10

6.1.2 PERIODIC FUNCTIONS 10

6.1.2.1 Per: EcuTMeasPer1 10

6.1.2.2 Design Rationale 10

6.1.2.3 Store Module Inputs to Local copies 10

6.1.2.4 (Processing of function)……… 10

6.1.2.5 Store Local copy of outputs into Module Outputs 10

6.2 Interrupt Functions 10

6.3 Serial Communication Functions 11

6.4 Local Function/Macro Definitions 11

6.5 GLObAL Function/Macro Definitions 11

6.6 TRANSIENT FUNCTIONS 11

7 Known Limitations With Design 12

8 UNIT TEST CONSIDERATION 13

9 Appendix 14

Abbrevations And Acronyms

References

This section lists the title & version of all the documents that are referred for development of this document

Ecutmeas & High-Level Description

Measures and diagnoses thermistor on ECU.

Design details of software module

Graphical representation of Ecutmeas

Data Flow Diagram

Module level DFD

N/A

Sub-Module level DFD

N/A

COMPONENT FLOW DIAGRAM

N/A

Variable definition for enumerated types

Constant Data Dictionary

Module specific Lookup Tables Constants

Software Module Implementation

Sub-Module Functions

None

Initialization Functions

INIT: EcuTMeasINIT1

Design Rationale

Per FDD author intent is to use standard Nexteer FilLp functions

Store Module Inputs to Local copies

Refer to FDD

(Processing of function)………

Refer to FDD

Store Local copy of outputs into Module Outputs

Refer to FDD

PERIODIC FUNCTIONS

(Note: For multiple periodic functions, insert new headers at the “Header 2” level – subset of “7.1.2 Periodic Functions” and follow the same sub-section design shown below). If none required, place the text “None”)

Per: EcuTMeasPer1

Design Rationale

Per FDD author intent is to use standard Nexteer FilLp functions

Store Module Inputs to Local copies

Refer to FDD

(Processing of function)………

Refer to FDD

Store Local copy of outputs into Module Outputs

Refer to FDD

Interrupt Functions

None

Serial Communication Functions

None

Local Function/Macro Definitions

Local Function #1

None

GLObAL Function/Macro Definitions

GLObAL Function #1

N/A

TRANSIENT FUNCTIONS

None

Known Limitations With Design

None

UNIT TEST CONSIDERATION

1. The Per Instance Memory in .m file EcuTMeasFilStVarPrev given as float32 type, represents the State variable of the filter FilSt, element of the struct FilLpRec1

   1. Range of Rte_Pim_EcuTMeasFilStVarPrev.FilSt is the range given in the .m file

2. the equation to calculate filter gain is:

FilGain = 1 - exp(-2PI * FrqPole * TiStep)

1. FrqPole is Rte_Prm_EcuTMeasFilTau_Val

2. TiStep is 100ms

3. Range of Rte_Pim_EcuTMeasFilStVarPrev.FilGain is calculated using the range of Rte_Prm_EcuTMeasFilTau_Val

3. The equation to calculate the filter output is:

Outp = ((Inp - FilSt) * FilGain) + FilSt

Appendix

None