The EB-561 Training System is designed to show how the various sensors in the modem automobile regulate the opening time of a fuel injector.

A number of experiments illustrate the important principles of operation of electronic fuel injection and related devices.

Real faults can be inserted by connecting a cable to a PU-2000 mainframe. Interactive courseware accompanies each experiment and troubleshooting exercise. The student is asked multiple-choice questions to test understanding before each experiment and at the conclusion of each experiment. All measurements are checked that they fall within predetermined limits.

System Description

Panel Components

• Fuel injector with actuating pulses test point

• Manual vacuum pump to test injector equivalent fuel displacement

• Idle air control including a stepper motor and air bypass limit switch

• Throttle body simulator including a suction fan and mass air flow (MAF) sensor with test point

• Throttle position switches for idle and full load conditions

• Main switching relay

• Coolant temperature simulator with temperature sensor

• 02 sensor simulator

Panel Controls

• Idle air control: start push button and 0/16/32 open/close bypass steps rotary selector

• Overrun fuel cutoff switch and indicator

• Injector actuation pulses: 32/64/128/256/512 and continuous selector and activating push-button

• Fuel injection duration rotary selector: 2 to 16 milliseconds

• System configuration rotary switch with 11 positions

Panel Indicator Devices

• Vacuum meter

• 02 sensor voltage and simulated 5 or 6 msec injection time

• Injector opening duration: 16 bar segments (1 to 16 msec)

• Tachometer: 10 elements (250 to 2500 rpm)

• Engine speed rotary display: 10 elements and pulse output test point

Recommended Experiments

1. Relation of injector opening duration to quantity of fuel injected

2. Effect of air temperature on quantity of fuel injected

3. Analyzing injection opening pattern on an oscilloscope

4. Determining injector opening time with an oscilloscope

5. Calculating injector opening time with a tachometer and dwell meter

6. MAF sensor operation, voltage and frequency output signals

7. Throttle position switch output signal

8. Throttle position sensor output signal

9. Comparing injector activation signal with various input conditions

10. Effect of ignition pulses on main switching relay

11. Injection duration at various engine speeds, temperatures and loads

12. Overrun fuel cutoff

13. Idle air control step motor operation and control

14. 02 sensor operation