The EB-563 is designed to show the principles operation of anti-lock braking systems (ABS) in the modern automobile.

ABS monitors the speed of each of the four wheels. When braking under certain road conditions, the speed of one or more wheels may drop below the vehicle speed. This reduction in speed or slip occurs before the wheel locks.

ABS control system detects wheel slip and reduces the braking force to wheels with a high slip thus preventing dangerous skidding and loss of control while braking.

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

The EB-563 training system uses four stepper motors to simulate the four rotating wheels of a car. One wheel is equipped with an inductive sensor and three wheels are equipped with a Hall device.

These sensors supply the Electronic Control Unit ECU with the current speed of each wheel in order to detect wheel slip. The speed and slip for each wheel is displayed on a large LCD control display unit.

The student can simulate various driving conditions by pressing on the brake and accelerator pedals. The operation of the hydraulic modulator is shown by a graphic reproduction on the panel.

The unit has a built-in stopwatch and elapsed distance displayed on the LCD to aid the students to perform experiments. Diagnostic tests are performed on the standard 35 pin ABS wiring harness plug with a standard DMM and the built-in diagnostic test box.

System Description

• Wheel and slotted disk driven by stepper motor (4)

• Unstable and lock LEDs (4)

• Inductive sensor with analog and digital outputs

• Hall sensor with digital output

• LCD display, 240x 64 pixels

• Hydraulic modulator with 10 multicolor LEDs to illustrate buildup, maintain and reduce modes

• Accelerator and brake pedals

• Brake pedal force meter

• Return pump on LED

• Modulator on LED

• Fault insertion plug

• ABS wiring harness plug with 35 test points

• Diagnostic box with: Solenoid valve relay LED. Turn FL wheel, maintain pressure. reduce pressure arid pump motor LED & switches Ignition switch

• ABS warning light

• Display fault code switch

• Stopwatch start, stop & reset

Recommended Experiments

Wheel Speed Sensing

1. Compare inductive and Hall sensor operation

2. Calculate wheel speed from wheel circumference, wheel teeth arid sensor frequency

Vehicle Acceleration

1. Calculate acceleration, elapsed time, speed and distance

2. Measure vehicle performance

3. Relation between force, mass and acceleration

4. Describe vehicle performance in terms of acceleration

Vehicle Braking Process

1. Calculate deceleration, braking distance and time

2. Wheel slip

3. Measure deceleration, braking distance and time

Wheel Lock

1. Understand causes and effects of wheel locking

2. Simulate wheel locking

ABS Fundamentals

1. Understand ABS advantages

2. Know about ABS operation and components

3. Simulate ABS braking process

Hydraulic Modulator

1. Solenoid valve types

2. Three position solenoid valves

3. Build-up, reduce and maintain pressure states

4. Simulate modulator operation

5. Determining factors

6. ABS control cycles

7. Graphical simulation on LCD

Control Cycles

1. Determining Factors

2. ABS Control Cycles

3. Graphical Simulation on LCD

Electrical Circuits

1. Understand ABS schematics

2. Know 35 pin ECU wiring harness signal assignment

3. Access ABS circuits via the 35 pin wiring harness

Operation

1. ABS warning light

2. Self-test procedure

3. Causes of brake pedal kick-back

t ABS Circuits

1. How to test electrical elements

2. How to use a breakout box

3. Resistance and voltage measurements

Self Diagnosis

1. Flash code output fault codes

2. Test with the ABS fault codes

ABS Test Procedures

1. Be familiar with LED testers

2. Simulate ABS tests with the EB-563 diagnostic box

Troubleshooting

1. Detect and diagnose faults in ABS systems

2. Learn troubleshooting procedures