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System Setup
Figure 8. Spin Bench Example for Creating a
Physical Simulated Engine Position Signal
Exercise 2: Creating a reference platform for a simulated engine environment
1. Open Load Worksheet.xls and bring the “Reference System Load Worksheet” to the front.
2. Obtain components listed. Generic component specifications are listed.
3. Additionally, a simulation for engine position will be required. Create this using any of the examples described in
this section. Verify the simulated engine position signal is being properly generated. For this reference platform
to work, a 12 minus 1 signal must be generated. This means 12 equally spaced teeth with one missing tooth
representing a gap. See Figure 9 for oscilloscope trace of 12 minus 1 signal.
4. Create a wire harness to connect reference components to the ECU. Include specifications of wire color and pin
number as applicable. This will aid in debugging and later development.
5. Connect the wire harness to the ECU.
6. Place the Engine Stop Switch in the active position, which is a short to ground.
7. Apply power. Verify connections are correct by noting that power supply is drawing less than 500mA of current
and no components of the ECU are generating large amounts of heat. If any component is hot, remove power
and verify connections.
8. Verify that no relays should be active. This should be audible when power is applied if a relay was activated. If
relay activates on power on, verify Engine Stop Switch position and relay connections.
Small Engine Reference Design User Manual , Rev. 3.0
Freescale Semiconductor
11
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