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Application Development
RUN
Once a minimum engine speed has been obtained and the correct system inputs have been applied, the
RUN state represents the normal operating state of the application for a rotating or running engine. The
engine control strategy is to be implemented in this state. System inputs must be maintained to keep the
engine in the RUN state and the engine speed must be above the stall speed but below the maximum
speed, identified in the User ’s Management header file as over speed.
OVERRUN
As a special case for an active engine, the OVERRUN state provides a way to limit the engine speed.
This can be implemented by changing the engine control outputs through variables or through disabling
specific engine control outputs. System inputs for an active engine state must be maintained to prevent
the ASM from going to the STOP state.
Additionally the engine speed must be reduced below a specific value. This parameter is adjusted in the
User Management header file as over speed recovery.
The true performance of the Small Engine Reference Design can only be shown in a real application.
Through development using a real engine, testing can be performed that addresses real system issues
with an engine control application. Using a real production scooter as a test platform demonstrates the
capabilities of the hardware and software beyond documentation. For this purpose, a demonstration
application using the 50cc EFI motorbike was selected. By retrofitting the engine controller with the Small
Engine Reference Design, a basic engine management application is demonstrated.
Small Engine Reference Design User Manual , Rev. 3.0
Freescale Semiconductor
25
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