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Appendix A: Hardware Reference Manual
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Appendix A: Hardware Reference Manual
The KIT33812ECUEVME is a working reference design for small engine control. It can be used right out
of the box to test and development applications that run small internal combustion engines, such as those
found on generators, lawn mowers, and motorbikes. The system is designed to be cost efficient for a
one-cylinder type of engine. Use of this design is an excellent starting point towards making a custom
small engine controller. Modification of the design was taken into consideration and basic information is
provided as a consideration for an application specific, production engine controller. This document will
review the key features of KIT33812ECUEVME and present design level information on the key circuits
in the design.
Background
As the government regulations around the world begin imposing regulations on small engines, electronic
fuel injection is the building block for the future of motorbikes, ATVs, lawn mowers, and all other low
displacement engines. Unlike large displacement engines of the automotive market, the change from
carburetion to electronic control has not been fully adopted. The main reasons for the resistance to
change are: cost and packaging. Small engines have been mechanically refined for over 20 years. This
does not leave much room for adding electronic components. This is especially true when the additional
electronic hardware adds significant cost to the product.
System Design
To address these concerns of the small engine market, the KIT33812ECUEVME is designed to be very
efficient in cost and size. Additionally the ECU is able to aid in the development of a next generation small
engine capable of meeting new emissions regulations. The key to creating such a system is the use of
integrated components specific to one-cylinder control. As a basis for the design, the Freescale MC33812
Small Engine Control IC was used. This device provides extensive integration of key components that
are essential to small engine control.
The KIT33812ECUEVME also takes advantage of the cost efficient MC9S12P128 microcontroller from
Freescale. This 16-bit processor rivals the cost of 8-bit devices while providing the right amount of
performance for a one-cylinder application. It also allows upward compatibility into the S12X MCU
product family for higher demand applications. Use of a 16-bit processor instead of a 32-bit processor
keeps the system costs down. While this limits the maximum performance of the system, less overall
performance is required due to the reduced complexity of a small engine compared to a 4-cylinder or
larger Automotive application.
A very specific set of signals was selected for the KIT33812ECUEVME. The complete list of signals for
the system is provided in Figure 22 . These signals reflect a system capable of closed-loop control of an
engine with the potential to meet at Euro III and above emissions levels. A complete list of the signals
with functionality and DC specifications is provided in Table “DC Specifications of the Signals for
KIT33812ECUEVME”
Freescale Semiconductor
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