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System Setup
3
System Setup
Now that the contents of the small engine reference design have been described, the focus will shift to
the complete development system. This includes the contents of this kit and the fuel injected engine as
a system. At a high level, system setup contains the following steps:
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Definition of interface between ECU and Engine
Creation of simulated engine environment
Installation and verification of software development environment
Engine load and sensor validation
Migration plan towards real engine hardware
To accomplish these steps, several exercises will be described to help take you through this critical
phase. These exercises include, getting started with Freescale CodeWarrior, and creating a known
reference system. Additionally, suggestions for further training will be provided based on using Freescale
products and the system level setup. Figure 2 shows the components of this kit and a placeholder for
your engine. This system incorporates the interface from the PC to the actual engine. The user must
provide the engine loads for electronic fuel injection including fuel injector, inductive ignition coil, relays,
and other relevant components. Signals from VRS, MAP, switches, and other inputs must also be
provided along with the actual engine itself.
3.1
8
Definition of interface between ECU and Engine
The first step in using this kit is to determine how it will connect to your engine system. As mentioned, the
engine must be fuel injected. If you are converting an engine from mechanical (carburetor) to electronic
control, this must be done before or in parallel with using this kit. The ECU is designed around a
one-cylinder engine, however, it can be adapted to work with a two-cylinder engine. The requirements for
two-cylinder operation are: a) ignition coil must be a dual output or twin coil, b) wasted-spark strategy is
acceptable for application. This means that a twin coil, capable of driving two separate spark plugs from
a single input, can be used to fire every engine revolution (in a four-stroke engine) to produce two spark
events, one in the desired cylinder and one in the second (wasted) cylinder. If this can be tolerated in the
system, fuel control can be provided individually to each cylinder through the INJOUT and ROUT1
signals.
To aid in the connection from the ECU to the engine, a worksheet is provided. Using Load Worksheet.xls,
available on the documentation DVD, connection to the engine can be defined. This Excel spreadsheet
contains the full list of connections and suggested functionality for each pin of the ECU. Matching up the
various controls, sensors, and inputs on the engine to the ECU should take into account voltage ranges
and current capabilities. If there is doubt to the connection, use the schematic and Hardware Design
Reference Manual found in Appendix A to for in-depth analysis of the circuits behind each ECU level pin.
The design goal of a cost-efficient design does not allow for a system to include all possible system
configurations. The signals available reflect essential controls for one-cylinder, closed-loop engine
control, highlighting the integration of the MC33812 Small Engine IC. Essential functionality should be
considered first, such as the direct controls for fuel and spark. System controls such as the fuel pump or
voltage regulator should be secondary concern as they can be externally controlled and do not require
precise timing execution.
Small Engine Reference Design User Manual , Rev. 3.0
Freescale Semiconductor
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