Limiter_Conditioning_MDD

Module – Limiter Conditioning

High-Level Description

This MDD describes the summation of all assist and limit terms used in an Electric Power Steering application.

Figures

Diagram – Component Diagram

Variable Data Dictionary

For details on module input / output variable, refer to the Data Dictionary for the application. Input / output variable names are listed here for reference.

Module Internal Variables

This section identifies the name, range and resolutions for module specific data created by this module. If there are no range restrictions on the variable, the term “FULL” is placed into the table for legal range.

User defined typedef definition/declaration

This section documents any user types uniquely used for the module.

Constant Data Dictionary

Calibration Constants

This section lists the calibrations used by the module. For details on calibration constants, refer to the Data Dictionary for the application.

Program(fixed) Constants

Embedded Constants

All embedded constants whose values are provided in Eng units will be evaluated to the equivalent counts by using the FPM_InitFixedPoint_m() macro within the #define statement.

Local

Global

This section lists the global constants used by the module. For details on global constants, refer to the Data Dictionary for the application.

Module specific Lookup Tables Constants

(This is for lookup tables (arrays) with fixed values, same name as other tables)

Functions/Macros used by the Sub-Modules

Library Functions / Macros

The library and functions / Macros that are called by the various sub modules are identified below,

1. Limit_m()

2. Sign_f32_m()

3. Min_m()

4. Max_m()

5. Abs_f32_m()

6. IntplVarXY_u16_u16Xu16Y_Cnt()

7. FPM_FloatToFixed_m()

8. FPM_FixedToFloat_m()

Data Hiding Functions

1. N/A

Global Functions/Macros Defined by this Module

N/A

Local Functions/Macros Used by this MDD only

N/A

Software Module Implementation

Runtime Environment (RTE) Initial Values

This section lists the initial values of data written by this module but controlled by the RTE. After RTE initialization, the data in this table will contain these values.

Initialization Functions

N/A

Periodic Functions

Per: LmtCod_Per1

Design Rationale

This function provides a layer of protection from erroneous signals feeding into SF-04 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 capability of fault injection at some inputs to facilate tuning. See FDD SF-38 for more details.

Program Flow Start

Rte_Call_LmtCod_Per1_CP0_CheckpointReached()

Store Module Inputs to Local copies

(Processing of function)………

Store Local copy of outputs into Module Outputs

Program Flow End

Rte_Call_LmtCod_Per1_CP1_CheckpointReached()

Fault Recovery Functions

N/A

Shutdown Functions

N/A

Interrupt Functions

N/A

Serial Communication Functions

N/A

Execution Requirements

Execution Sequence of the Module

Execution Rates for sub-modules called by the Scheduler

This table serves as reference for the Scheduler design

Execution Requirements for Serial Communication Functions

Memory Map Definition Requirements

Sub Modules (Functions)

This table identifies the software segments for functions identified in this module.

Local Functions

This table identifies the software segments for local functions identified in this module.

Known Issues / Limitations With Design

1. INLINE functions defined in globalmacro.h are not unittested.

Revision Control Log