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Appendix B: Software Reference Manual
E n g i n e M a n a g e m e n t
D a t a M a n a g e m e n t
F u e l C o n t r o l l e r
S p a r k C o n t r o l l e r
C r a n k s h a f t S y n c h r o n i z e r
Figure 24. Visual Diagram of the Software Architecture used for the Small Engine Reference Design
At the lowest level is a crankshaft state machine that responds to tooth driven interrupts. The main task
of this state machine is to validate each tooth edge and maintain a synchronized state that can create
angle based events. Activities include synchronizing to the missing tooth gap, validating a tooth period,
counting teeth, scheduling future fuel and spark events.
C r a n k s h a f t S y n c h r o n i z e r
C r r a a n n k k S S i g n a l
F i l l t t e r a n d S y n n c c
T o o t h h T i m i i n n g g
M e a s u r e m e n t s
C r r a a n n k k s h a f t t S S y y n c
T o o t h C o u n t
E n g i n e S p e e d
E v e n t S t a r t i i n n g g T o o t h h
Figure 25. Crankshaft Layer Data Flow
Once the crankshaft state machine reaches a synchronized state, it can then begin scheduling events for
the fuel and spark controllers. These events are based on the single action timer channel hardware of the
MCU. For this type of hardware capabilities, the best precision possible is to use the tooth interrupt as a
known point in the rotation of the engine. Using the time between the last two teeth and the angle this
Small Engine Reference Design User Manual , Rev. 3.0
56
Freescale Semiconductor
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