- Idle air control: start push button and 0/16/32 open/close
bypass steps rotary selector
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- Engine speed rotary display: 10 elements and pulse output test
point
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- Overrun fuel cut off switch and indicator
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- Fuel injector with actuating pulses test point
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- Injector actuation pulses: 32/64/128/256/512 and continuous selector
and activating push-button
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- Manual vacuum pump to test injector equivalent fuel
displacement
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- Fuel injection duration rotary selector: 2 to 16 milliseconds
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- Throttle body simulator including a suction fan and mass air flow (MAF)
sensor with test point
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- System configuration rotary switch with 11 positions
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- Throttle position switches for idle and full load conditions
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- 02 sensor voltage and simulated 5 or 6 msec injection time
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- Coolant temperature simulator with temperature sensor
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- Injector opening duration: 16 bar segments (1 to 16 msec)
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- Idle air control including a stepper motor and air bypass limit
switch
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- Tachometer: 10 elements (250 to 2500 rpm)
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Student experiments on the computer-interfaced Electronic Fuel Ignition Demonstrator include:
- Relation of injector opening duration to quantity of fuel injected
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- Effect of air temperature on quantity of fuel injected
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- Determining injector opening time with an oscilloscope
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- Calculating injector opening time with a tachometer and dwell
meter
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- Throttle position sensor output signal
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- Throttle position switch output signal
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- MAF sensor operation, voltage and frequency output signals
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- Injection duration at various engine speeds, temperatures and
loads
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- Analyzing injection opening pattern on an oscilloscope
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- Comparing injector activation signal with various input conditions
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- Idle air control step motor operation and control
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- Effect of ignition pulses on main switching relay
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