DIS is a generic term to describe an ignition system that does not use a distributor. Most modern cars are equipped with DIS.

The EB-562 is designed to show the principles of operation of electronic distributorless systems (DIS) in the modem automobile. DIS controls the spark timing to achieve optimum engine performance and efficiency under
various starting and driving conditions for different water coolant temperature, engine speed and load. 

Real faults can be inserted by connecting a cable to the PU-20O0 or PU-2000 mainframe. Interactive courseware accompanies each experiment and troubleshooting exercise. The student is asked multiple choice questions to test his understanding before each experiment as well as observation questions at the conclusion of each experiment.

All measurements are checked that they fall within predetermined limits. The EB-562 training system uses an electric motor to rotate an iron disk that triggers a Hall effect "crank sensor". This sensor alternately switches two transformers that simulate ignition coils that are connected to two spark gaps.

The ignition timing and dwell are controlled from the information received from the sensors, much in the same way as in a real DIS. An integral high intensity LED lamp serves as a stroboscope to accurately measure dwell angle and ignition advance. An LCD display shows engine RPM, engine coolant temperature and ignition timing in degrees.

All relevant signals are brought out to test points, such as: Hall sensor out, knock sensor out, engine speed, coolant temperature. MAP out, A/D input, primary ignition voltage and current (2), secondary ignition voltage (4) divided by 100, stroboscope trigger.

System Description

• Slotted iron disk driven by DC motor

• Crankshaft position sensor

• Ignition coils (2)

• Spark gaps (4)

• Spark plug fifing sequence indicators

• Manifold absolute pressure (MAP) sensor

• MAP simulator potentiometer

• Engine coolant temperature sensor with heating element

• Knock sensor

Recommended Experiments

Event & Waste Sparks

1. Electron flow in DIS secondary circuits

2. Normal and backward firing

3. Event & waste spark firing

4. Firing sequence in an engine.

Secondary Circuit Waveform

1. Spark plug firing voltage

2. Secondary voltage pattern

3. DIS coil firing sequence

4. DIS firing order

5. DIS spark firing voltage and polarity

Trigger Pulse

1. Hall effect sensor

2. Crankshaft position

3. Engine speed measurement

4. Coil select function.

Measuring Ignition Timing

1. Effect of turning on engine performance and efficiency

2. Factors that determine ignition timing

3. Measuring ignition timing and spark advance.

Effect of Engine Speed on Ignition Timing

1. DIS module functions

2. Ignition map

3. Measure effect and draw a graph of engine speed on spark advance.

MAP Sensors

1. MAP sensor operation

2. Measure the relation between vacuum and MAP output

3. Simulating MAP output

Effect of Engine Load on Spark Timing

1. Why timing depends on load

2. Measure effect of load on spark liming

3. Simulating the load signal

Effect of Engine Temperature on Spark Timing

1. Why spark timing depends on temperature

2. Conversion of coolant temperature to a voltage

3. Simulate temperature input to ECM

Knock Control

1. Causes of detonation

2. Knock sensor operation

3. Closed loop knock control

4. Monitoring knock control

Troubleshooting

1. Detect and diagnose faults in electronic DIS systems

2. Detect and diagnose faults in DIS sensors and circuits

3. Learn troubleshooting procedures.