8.9 KiB
Naming convention
[TOC]
<Type><Module>_<Quantity>_<Description>
Type
Type is indicated by the first letter, like in sVcEc_D_EngState.
- y = global bool (model interface to suroundings).
- x = local bool (internal model signals).
- s = global variable, non bool (float, uint ...).
- r = local variable non bool.
- c = constant.
- t = table.
- m = map.
Prefix Two
For example sVcEc_D_EngState. Original meaning was Vehicle Control. In Volvo Cars, it is today used to signify that the signal is defined by VCC.
Module
For example sVcEc_D_EngState. Shows the signal origin. Insignal from supplier software partition uses Ec (Engine control), Di (Driver interface), Bc (Brake control). Outsignal use the model name, for example VcDeScl will have out signals named sVcDeScl_X_*.
Quantity
See table. You can find the allowed abbreviations in the file SPM_Units.xls in the ConfigDocuments folder in your project.
| Abbreviation | Meaning | Standard Unit |
|---|---|---|
| a | Acceleration | m/s2 |
| ad | Deriv of Acc | m/s3 |
| an | Angle | CA, deg, rad |
| and | Angle/s | CA/s, deg/s, rad/s |
| Ar | Area | m2, mm2 |
| B | Boolean, flag 0/1 | - |
| D | Discrete (enumeration type) | - |
| E | Energy | J, kJ, kWh, mWh, Wh |
| ef | Efficiency | - |
| Enm | Enumeration (string type, implicit enum) | - |
| Eta | Viscosity Dynamic | mPa s, Pa s |
| F | Force | N |
| fac | Factor | - |
| Fd | Force Rate | N/s |
| fq | Frequency | Hz |
| Gear | Gear | - |
| I | Current | A, mA, uA |
| Id | Current Rate | A/s |
| J | Inertia | kgm2 |
| L | Distance, Length | m, km, mm |
| lam | lambda | - |
| lk | Distance, Length | m, km |
| m | Mass | g, kg, mg, mg/stk |
| m | Mass per Revolution | g/rev |
| md | Massflow | g/s, kg/h, kg/s, mg/s |
| mu | Viscosity Kinematic | cSt, m2/s |
| n | Revolution Speed Number | rpm, krpm, rps |
| nd | Revolution Acceleration | rpm/s |
| p | Pressure | bar, hPa, kPa, MPa |
| pd | Pressure Rate | kPa/s |
| Pw | Power | W, kW |
| Pwd | Power Rate | kW/s |
| Q | Flow | l/h, l/min, l/s, m3/h |
| q | Quantity | mg, mg/stk |
| Qd | Heat Change | |
| Qf | Quality Flag | - |
| R | Electrical Resistance | mOhm, Ohm |
| rho | Density | - |
| rt | Ratio | - |
| rtd | Change of Ratio | 1/s |
| t | Time | s, min, ms, ns, us |
| tc | Time Constant | s |
| Te | Temperature | deg C, K |
| Ted | Temperature Change | deg C/s |
| Tq | Torque | Nm |
| Tqd | Torque Rate | Nm/s2 |
| Tqi | Accumulated Torque Over Time | Nms |
| ts | Sample Time | s |
| U | Voltage | V |
| v | Velocity | km/h, m/s, mph |
| vi | Accumulated Speed Fault Over Time | m/s s |
| vol | Volume | cm3, l |
| w | Angular Velocity | rad/s |
| wd | Angular Velocity Rate | rad/s2 |
| X | Share | % |
| xb | Burned Fraction | - |
| Xd | Change of Share | %/s |
| Xi | Accumulated Percentage Over Time | %s |
| Z | Non Standard Quantity | any |
| Z | Concentration | ppm |
| Zd | Non Standard Quantity Change | any |
Description
It can be useful to look at the AUTOSAR name conventions, that might be the only useful from Autosar. An AUTOSAR name consists of four parts, see table.
Structure
Example:
The subfunction of a model shall be seen as a ”Device”, e.g. EgrMonr for the Egr Flow monitor, EgrClrMonr for the Egr Cooler monitor etc. If the model does not have sub functions, the Device can be chosen according to the standard.
Usually quantity and position.
- MFlw – Mass Flow.
- VolFlw – Volume Flow.
- P – Pressure.
- T – Temperature.
- Lam – Lambda.
- Tq – Torque.
- Ag – Angle.
- Ar – Area.
- Pos – Position.
- Pwr – Power.
- Ti – Time.
- U – Volatge.
- I – Electric Current.
- Rat – Ratio (duty cycle ratio).
There are more, see AUTOSAR.
For example PAmb (Ambient pressure), TIntk (Temperature in the Intake), TDs (Temp Downstream) and MFlwUs (Mass Flow Upstream).
Calculated Signals.
- Sp – Setpoint: Base mappning (MR also uses ”Req” – Requested).
- Tar – Target: Limited Setpoint values.
- Est – Estimated: An estimation of a value. E.g. rVcAesObd_T_SupChrgrMonrTDsEst.
- Raw – Raw – Unprocessed sensor data.
Replacement Values.
- Rvlu – Replacement value.
Running Conditions.
The limits for determening running conditions shall use the following naming: [Hi/Lo/Min/Max]EnaLim. E.g. EgrMonrAmbPMinEnaLim, SupChrgrMonrPDrpLoEnaLim [Super Charger Pressure Drop Low Enable Limit]. Boolean result from the limits shall use the Condition ”Enable” – ”Ena”. E.g. EgrMonrAmbPMinEna, SupChrgrMonrPDrpLoEna.
Test Values.
The test values shall use the following naming: [Hi/Lo/Min/Max]TstVlu. E.g. EgrMonrArMinTstVal [Egr Monitor Area Min Test Value], SupChrgrMonrPTstVal [Super Charger Pressure Test Value].
The completion of a test value calculation shall be named: [Hi/Lo/Min/Max]TstVluCmplt. E.g. EgrMonrArMinTstValCmpl [Egr Monitor Area Min Test Value Complete], SupChrgrMonrPTstValCmpl [Super Charger Pressure Test Value Complete].
Error/Ok information faults shall be called "Errors", short name is "Err". Passed shall be called Ok (Ok). Determening faults conditions: "Error Threshold", i.e. the condition shall be [Hi/Lo/Min/Max]ErrThd. E.g. EgrMonrArErrThd, BoostMonrPHiErrThd.
Monitor Error Flag - *Err, e.g. EgrMonrArErr. Monitor Pass Flag – *Ok, e.g. EgrMonrArOk [Egr Area Ok], VVTMonrPosnMaxOk [VVT Position Max Ok].