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Appendix B: Software Reference Manual
11.2
Building Application
Creating a new engine control strategy takes significant experience and knowledge. It is recommended
that you work with one of the demo applications to get a feel for a basic application using this software
before creating a new one. If you choose to work with a ground up application or a demo one, there are
several files that are intended for use: User Management.c, Engine Management.c, and Data
Management.c. Each file also has an associated header file. Additionally, each file is designed to contain
a single task that is periodically executed. These tasks are User Management(), Engine Management(),
and Data Management(). The file Tasks.h is used to determine when each of these application tasks are
called and should be modified by the user to customize the application. Tasks are broken out into 1.0 ms,
2.0 ms, 10 ms, 50 ms, and 100 ms function calls. The scheduler is very simple and the user must take
into account the real time aspects of making these function calls.
11.2.1 User Files
The software architecture allows the user to work with four C-code files to create a custom engine control
application, User Management, Data Management, Engine Management, and Application Maps. Each of
these files has a header file associated with it as well for declaring functions and making definitions
specific to the application. Each of these files, with the exception of the Applications Maps, has a specific
function call associated with it that is invoked by the task scheduler. The scheduling of these tasks can
be modified in the tasks.h file as discussed previously. The tasks.h file should include a function call to
each of the user functions: User_Management(), Data_Management(), and Engine_Management().
These user functions provide interaction with the low level driver functions necessary to control an
engine.
11.2.2 User_Management()
This function provides the interface between the engine user/operator and the engine control software.
The highest level of control is performed through this function. It must take the user inputs and turn them
into data for engine control as well as maintain basic operating conditions related to engine's current
operating point. For example, a fundamental user control is the throttle. User_Management() will take the
throttle position data and provide this data to the fuel and spark controllers so that the fuel and spark is
adjusted for the current throttle position. Another fundamental user control is the engine kill switch. The
ability of the user to shut off the engine at anytime must be maintained through the User_Management()
function.
Examples of a more complete User_Management() function is provided in the example application. This
examples use a state machine approach as running an engine has natural control states desired by most
users. When getting started, it may beneficial to keep it simple and have a minimal number of inputs. This
will allow the designer to get familiar with the entire software architecture before getting into a more
complex application.
11.2.3 Data_Management()
All inputs to the system are collected by the Data_Management() function. There are two exceptions.
Engine tooth/position data is handled specifically by the low level crank position functions. Also, the MAP
signal may be defined to be collected on a tooth basis, not a time basis, which is defined in the application
header file.
Digital and analog signals are collected and filtered by the Data_Management() task. Each signal must
be defined and configured in the application header file. The Data_Management() must then collect the
data and filter the data when buffers are full. The filtered data can then be used by User_Management().
Small Engine Reference Design User Manual , Rev. 3.0
Freescale Semiconductor
59
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