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System Overview
5
System Overview
Design for the ECU is centered on an EFI system capable of closed-loop control for a one cylinder engine
using known loads. This system includes essential inputs and outputs for an application that is emissions
sensitive. Figure 20 shows the high level signals of the Small Engine Reference Design. Inputs include
6 analog channels and one digital input. The names of these signals are suggestions for use but may be
changed based on application demands. Additionally, a special input is used for the crankshaft sensor.
This is for a VRS using 2 pins but can be adapted to use a Hall Effect type of interface. A total of 10
outputs are available, each with specific functionality in mind. In most cases these outputs are oversized.
This allows the drivers to be flexible to a broad range of loads. One special output is provided as a system
reference voltage available for sensors drawing small amounts of current. Further detail of ECU design
is covered in the Hardware Reference Manual found in Appendix A.
Tilt
Engine Stop Switch
TPS
ATEMP
ETEMP
MAP
O2
Crankshaft Sensor
Battery
DIAG
MC33812
Reference
Design
Malfunction Indicator
Relay
O2 Heater
Idle Speed Motor(A)
Idle Speed Motor(B)
Idle Speed Motor(C)
Idle Speed Motor(D)
Ignition Coil
Fuel Injector
Fuel Pump
Ground
Sensor Reference
Figure 20. Module Level Signals of the Small Engine Reference Design.
Accelerator
Position
I/O or ADC
I/O
Man ifo ld p re ssure
ADC
MCU
BDM
Develo pm ent
and Pro gram min g
Po rts
Power
SPI & I/O
Fu el
In je ctor
BAT
Ign itio n Switch
Power
Supply
SPI & Parallel
SPI Watchdog
SMARTMOS
Injector
Ignition
B ipo lar coil d rive
H-Bridge
C ran kshaft
ang le
VRS input
( 1)
( 2)
d .c . mo tor
step p er
ISO9141
Switched Outputs
F uel
Pum p
Figure 21. System Block Diagram for the Scooter Engine Control
Small Engine Reference Design User Manual , Rev. 3.0
26
Freescale Semiconductor
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