CurrMeas_MDD
Module Design Document
For
Current Measurement
November 18, 2016
Prepared For:
Software Engineering
Nexteer Automotive,
Saginaw, MI, USA
Prepared By:
TATA ELXSI
CHENNAI, INDIA
Change History
| Sl. No. | Description | Author | Version | Date |
| 1 | Initial Version | Selva | 1.0 | 4- May-2015 |
| 2.0 | Updated to v 3.1.0 of the FDD (Merged CurrMeas_MDD and CurrMeas_MotCtrl_MDD) | Selva | 2.0 | 29-Sep-2015 |
| 3.0 | Updated per design rev. 4.2.0 | Rijvi Ahmed | 3.0 | 30-Mar-2016 |
| 4.0 | Added design limitation and unit test consideration. Design rev. 4.5.0 | Rijvi Ahmed | 4.0 | 05-October-2016 |
| 5.0 | Updated per design rev. 4.6.0 | TATA | 5.0 | 18-Nov-2016 |
Table of Contents
2 Current Measurement & High-Level Description 6
3 Design details of software module 7
4.1.1 Program (fixed) Constants 8
5 Software Component Implementation 9
5.4.1 Serverrunnable: CurrMeasEolGainSTsReq 10
5.4.2 Serverrunnable: CurrMeasEoloffsSTsReq 10
5.4.3 Serverrunnable: CurrMeasEoloffsReq 10
5.4.4 Serverrunnable: CurrMeasEolGainReq 11
5.4.5 Serverrunnable: CurrMeasGainReadReq 11
5.4.6 Serverrunnable: CurrMeasGainWrReq 11
5.4.7 Serverrunnable: CurrMeasOffsReadReq 11
5.4.8 Serverrunnable: CurrMeasOffsWrReq 11
5.5 Module Internal (Local) Functions 12
5.5.1 Local Function #1 PerformGainCalibration 12
5.5.2 Local Function #2 SigMaxMinGain 12
5.5.3 Local Function #3 SigMaxMinOffs 12
5.5.4 Local Function #4 ProtocolChkWI 12
5.5.5 Local Function #1 ProtocolChkEn 13
5.5.6 Local Function #2 CalcMotCurrMotAgCorrd 13
5.5.7 Local Function #3 OffsCalcABC 13
5.5.8 Local Function #4 OffsCalcDEF 14
5.5.9 Local Function #5 CalMotCurrCorrdABC 14
5.5.10 Local Function #6 CalMotCurrCorrdDEF 15
6 GLOBAL Function/Macro Definitions 16
7 Known Limitations with Design 17
Appendix A Abbreviations and Acronyms 19
Introduction
Purpose
MDD for Current Measurement
Current Measurement & High-Level Description
Refer FDD Design for Current Measurement
Design details of software module
Graphical representation of Current Measurement
Data Flow Diagram
Component level DFD
None
Function level DFD
None
Constant Data Dictionary
Program (fixed) Constants
Embedded Constants
Local Constants
| Constant Name | Resolution | Units | Value |
| CALPROCNOTSTRTD_CNT_U08 | 1 | Cnt | 0 |
| CALPROCSTRTD_CNT_U08 | 1 | Cnt | 1 |
| CALPROCPASS_CNT_U08 | 1 | Cnt | 2 |
| CALPROCPHAABCEOLOUTOFRNG_CNT_U08 | 1 | Cnt | 4 |
| CALPROCPHADEFEOLOUTOFRNG_CNT_U08 | 1 | Cnt | 8 |
| CALPROCPHAABCDEFEOLOUTOFRNG_CNT_U08 | 1 | Cnt | 12 |
| CALPROCVEHSPDCNDNOTMET_CNT_U08 | 1 | Cnt | 16 |
| CALPROCMOTVELMRFCNDNOTMET_CNT_U08 | 1 | Cnt | 32 |
| CALPROCBOTHIVTRINACTV_CNT_U08 | 1 | Cnt | 64 |
| DIFOFFSRNGCHKMAX_VOLT_F32 | Single precision float | Ampr | 1.0 |
| DIFOFFSRNGCHKMIN_VOLT_F32 | Single precision float | Ampr | -1.0 |
| NANOSECTOSEC_ULS_F32 | float32 | Uls | 0.000000001 |
| Refer DataDict.m file for other local constants | Refer DataDict.m file for other local constants | Refer DataDict.m file for other local constants | Refer DataDict.m file for other local constants |
Software Component Implementation
Sub-Module Functions
INIT: CurrMeasInit1
Design Rationale
Init1 function is created so that it will allow a RTE model to be created in the AUTOSAR tools which allows Per-Instance Memory and calibration definition needs. The initialization function is doing nothing
Store Module Inputs to Local copies
None
(Processing of function)………
None
Store Local copy of outputs into Module Outputs
None
PERIODIC FUNCTIONS
(Note: For multiple periodic functions, insert new headers at the “Header 2” level – subset of “ Periodic Functions” and follow the same sub-section design shown below). If none required, place the text “None”)>
Per: CurrMeasPer1
Design Rationale
Refer the FDD
Store Module Inputs to Local copies
(Processing of function)………
Refer the FDD
Store Local copy of outputs into Module Outputs
Refer the FDD
Per: CurrMeasPer2
Design Rationale
Refer to FDD
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
Per: CurrMeasPer3
Design Rationale
Refer to FDD
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
Server Runables
Serverrunnable: CurrMeasEolGainSTsReq
Design Rationale
Refer the FDD
Serverrunnable: CurrMeasEoloffsSTsReq
Design Rationale
Refer the FDD
Serverrunnable: CurrMeasEoloffsReq
Design Rationale
Refer the FDD
Serverrunnable: CurrMeasEolGainReq
Design Rationale
Refer the FDD
Serverrunnable: CurrMeasGainReadReq
Design Rationale
Refer the FDD
Serverrunnable: CurrMeasGainWrReq
Design Rationale
Refer the FDD
Serverrunnable: CurrMeasOffsReadReq
Design Rationale
Refer the FDD
Serverrunnable: CurrMeasOffsWrReq
Design Rationale
Refer the FDD
Module Internal (Local) Functions
Local Function #1 PerformGainCalibration
| Function Name | PerformGainCalibration | Type | Min | Max |
| Arguments | None | |||
| Return Value | None |
Description
Refer FDD.
Local Function #2 SigMaxMinGain
| Function Name | SigMaxMinGain | Type | Min | Max |
| Arguments | None | |||
| Return Value | None |
Description
Refer FDD.
Local Function #3 SigMaxMinOffs
| Function Name | SigMaxMinOffs | Type | Min | Max |
| Arguments | None | |||
| Return Value | None |
Description
Refer FDD.
Local Function #4 ProtocolChkWI
| Function Name | ProtocolChkWI | Type | Min | Max |
| MotCtrlMotCurrAdcVly1_Volt_T_f32 | float32 | 0.3 | 4.8 | |
| MotCtrlMotCurrAdcVly2_Volt_T_f32 | float32 | 0.3 | 4.8 | |
| MotCtrlMotCurrAdcVly3_Volt_T_f32 | float32 | 0.3 | 4.8 | |
| Return Value | ProtocolChk_Cnt_T_logl | boolean | FALSE | TRUE |
Description
Refer FDD.
Local Function #1 ProtocolChkEn
| Function Name | ProtocolChkEn | Type | Min | Max |
| Arguments Passed | MotCtrlMotCurrAdcVly1AdcFaild_Cnt_T_logl | boolean | FALSE | TRUE |
| MotCtrlMotCurrAdcVly2AdcFaild_Cnt_T_logl | boolean | FALSE | TRUE | |
| MotCtrlMotCurrAdcVly3AdcFaild_Cnt_T_logl | boolean | FALSE | TRUE | |
| Return Value | ProtocolChkEn_Cnt_T_logl | boolean | FALSE | TRUE |
Description
Refer FDD.
Local Function #2 CalcMotCurrMotAgCorrd
| Function Name | CalcMotCurrMotAgCorrd | Type | Min | Max |
| MotCtrlMotAgElec_Rev_T_u0p16 | u0p16 | 0 | 65535 | |
| MotCtrlMotElecMeclPolarity_Uls_T_s08 | Sint8 | -1 | 1 | |
| MotCtrlMotVelMrf_MtrRadpS_T_f32 | float32 | -1350 | 1350 | |
| Return Value | MotCtrlCurrMeasMotAgCorrd_Rad_T_f32 | float32 | -6.28 | 6.28 |
Description
Refer FDD.
MotCtrlMotElecMeclPolarity_Uls_T_s08 takes -1 and +1 as its values
Local Function #3 OffsCalcABC
| Function Name | OffsCalcABC | Type | Min | Max |
| Arguments | MotCtrlBrdgVltg_Volt_T_f32 | float32 | 6 | 26.5 |
| MotCtrlPhaOnTiA_NanoSec_T_u32 | uint32 | 0 | 71429 | |
| MotCtrlPhaOnTiB_NanoSec_T_u32 | uint32 | 0 | 71429 | |
| MotCtrlPhaOnTiC_NanoSec_T_u32 | uint32 | 0 | 71429 | |
| Return Value | *MotCurrOffsA_Volt_T_f32 | float32 | 0 | 5 |
| *MotCurrOffsB_Volt_T_f32 | float32 | 0 | 5 | |
| *MotCurrOffsC_Volt_T_f32 | float32 | 0 | 5 |
Description
Refer FDD.
Local Function #4 OffsCalcDEF
| Function Name | OffsCalcDEF | Type | Min | Max |
| Arguments | MotCtrlBrdgVltg_Volt_T_f32 | float32 | 6 | 26.5 |
| MotCtrlPhaOnTiA_NanoSec_T_u32 | uint32 | 0 | 71429 | |
| MotCtrlPhaOnTiB_NanoSec_T_u32 | uint32 | 0 | 71429 | |
| MotCtrlPhaOnTiC_NanoSec_T_u32 | uint32 | 0 | 71429 | |
| Return Value | *MotCurrOffsD_Volt_T_f32 | float32 | 0 | 5 |
| *MotCurrOffsE_Volt_T_f32 | float32 | 0 | 5 | |
| *MotCurrOffsF_Volt_T_f32 | float32 | 0 | 5 |
Description
Refer FDD.
Local Function #5 CalMotCurrCorrdABC
| Function Name | CalMotCurrCorrdABC | Type | Min | Max |
| MotCurrOffsA_Volt_T_f32 | float32 | 0 | 5 | |
| MotCurrOffsB_Volt_T_f32 | float32 | 0 | 5 | |
| MotCurrOffsC_Volt_T_f32 | float32 | 0 | 5 | |
| Return Value | MotCtrlMotCurrCorrdA | float32 | -200 | 200 |
| MotCtrlMotCurrCorrdB | float32 | -200 | 200 | |
| MotCtrlMotCurrCorrdC | float32 | -200 | 200 |
Description
Refer FDD.
Note: MotCtrlMotCurrCorrdA, MotCtrlMotCurrCorrdB, MotCtrlMotCurrCorrdC are not updated every runnable loop as Motor Control Manager should retain its last known good value.
Local Function #6 CalMotCurrCorrdDEF
| Function Name | CalMotCurrCorrdDEF | Type | Min | Max |
| MotCurrOffsD_Volt_T_f32 | float32 | 0 | 5 | |
| MotCurrOffsE_Volt_T_f32 | float32 | 0 | 5 | |
| MotCurrOffsF_Volt_T_f32 | float32 | 0 | 5 | |
| Return Value | MotCtrlMotCurrCorrdD | float32 | -200 | 200 |
| MotCtrlMotCurrCorrdE | float32 | -200 | 200 | |
| MotCtrlMotCurrCorrdF | float32 | -200 | 200 |
Description
Note: MotCtrlMotCurrCorrdA, MotCtrlMotCurrCorrdB, MotCtrlMotCurrCorrdC are not updated every runnable loop as Motor Control Manager should retain its last known good value.
Local Function #7 McecsOffsCmdStrtandHi
| Function Name | McecsOffsCmdStrtandHi | Type | Min | Max |
| Inputs | NA | NA | NA | NA |
| Return Value | NA | NA | NA | NA |
Description
Note: This function corresponds to MCECS_OFFSCMDSTRT and MCECS_OFFSCMDHI cases in Per1
Local Function #8 McecsOffsCmdEndandAd
| Function Name | McecsOffsCmdEndandAd | Type | Min | Max |
| Inputs | NA | NA | NA | NA |
| Return Value | NA | NA | NA | NA |
Description
Note: This function corresponds to MCECS_OFFSCMDEND and MCECS_GAINCMDAD cases in PerformGainCalibration()
GLOBAL Function/Macro Definitions
None
Known Limitations with Design
In the implementation of Simulink block “CurrMeasPer2” the source code has made a decision to implement the protocol checks first then the motor control based timing checks. This leads to a scenario where the counter PhaOnTiErrCnt will only get incremented when the ABC passes the protocol check, whereas the model will increment it regardless of protocol check status. This counter is in effect used for display purposes only. So it’s okay to keep this mismatch.
UNIT TEST CONSIDERATION
In the function CalMotCurrCorrdABC variables MotCtrlPhaOnTiA_NanoSec_T_u32, MotCtrlPhaOnTiB_NanoSec_T_u32 and MotCtrlPhaOnTiC_NanoSec_T_u32 are a percentage of MotCtrlPwmPerd_NanoSec_T_u32, 100% is the maximum. Therefore never use a value for MotCtrlPhaOnTiA_NanoSec_T_u32, MotCtrlPhaOnTiB_NanoSec_T_u32 and MotCtrlPhaOnTiC_NanoSec_T_u32 which is greater than MotCtrlPwmPerd_NanoSec_T_u32.
Abbreviations and Acronyms
| Abbreviation or Acronym | Description |
|---|---|
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) | v1.3.0 R4.0 Rev 2 |
| 2 | MDD Guideline | EA4 01.00.00 |
| 3 | Software Naming Conventions.doc | 1.0 |
| 4 | Software Design and Coding Standards.doc | 2.1 |
| 5 | Current Meaurement Design ES200A_CurrMeas_Design | See Synergy subversion |