Art. 104

Antijamming wheels braking Bosch (A.B.S.) with four detectors plants simulator

The simulator system we offer (A.B.S. 2B produced by Bosch) is
composed of a traditional TANDEM brake pump.
The two outputs of the brake pump, each controlling diagnally a front
and back wheel, are connected to a hydraulic power unit and
consequently to a 4 solenoid valves with 3 positions:

• Pressure loading position;
• Pressure maintenance position;
• Pressure unloading position.

The solenoid valves receive a command by current from the
electronic power unit.
The hydraulic power unit also incorporates the following:

• Recovery pump;
• Relative control relay;
• Safety diode for lighting the A.B.S. lamp;
• Solenoid valves power supply relay.

The electronic circuit is composed of the following:

• Overvoltage relay, also operating as the main relay;
• 4 inductive sensors detecting wheel speed;
• Electronic power unit constituting the intelligent unit
  of the whole systems, which works out all signals in input
  and consequently supplies commands to different actuators;
• Solenoid valves allowing the modulation of pressure to the
  calipers during the A.B.S. regulations;
• Recovery pump which recovers the brake fluid during the
  pressure unloading phase;
• A.B.S. lamp which lights in the event of the system irregularities;
• Switch located on the brake pedal communicating to the power
  unit that the driver is braking;
• Voltage signal communicating that the vehicle is running.

Technical features

The technical characteristic of trainer are:

• Dynamic and actual operation of an automotive
  braking system;
• Display of the pressures and revolutions in relation to
  each of the 4 wheels;
• Possibility of varying the static load on each wheel in
  order to simulate the different coefficients of friction
  occurring under the actual conditions of an automobile;
• Possibility of connecting/disconneting the A.B.S. system
  in order to compare the automobile's two reactions
  during braking;
• Simulations by switches of main breakdowns that
  could occur to the plant;
• Autodiagnosis visual gauge;
• Adjusable speed changer;
• Inside the board there is:
• Mechanical unit for wheels dragging;
• Electric engine;
• Feeder 12V for system supply;
• Engine revolutions check electronical unit.
• Autovehicle miniature chassis constituited of:
  • 4 Wheels;
  • 4 Disc-brakes;
  • 4 Phonic wheels;
  • 4 PICK-UP sensors;
  • 4 Variable load springs.

On the front side are located:

• A knob simulating the motor rpm variation;
• Ignition key with a special warning light;
• Electrical plug for 12V;
• Red light for A.B.S. faulty;
• Red switch for A.B.S. simulator off.

In the back side of the trainer, inside the door,
there are housed switches which can simulate
several faults occuring in the vehicle.

Simulations

This teaching panel simulates endless braking conditions
of a car.
As a matter of fact, several actual cases of a braking car
can be accurately simulated by using the proper controls.

Types of simulations:

• Simulation Pick-Up wheel n. 1 trouble;
• Simulation Pick-Up wheel n. 2 trouble;
• Simulation Pick-Up wheel n. 3 trouble;
• Simulation Pick-Up wheel n. 4 trouble;
• Simulation battery trouble;
• Simulation solenoid valve for wheel n. 1 trouble;
• Simulation solenoid valve for wheel n. 2 trouble;
• Simulation solenoid valve for wheel n. 3 trouble;
• Simulation solenoid valve for wheel n. 4 trouble;

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