Laboratory Stand “Element-Wise Testing and Diagnostics of Power Steering Systems”

The training and laboratory stand provides for the performance of one additional laboratory work, in which general tests of the hydraulic booster are carried out (with simulation of the turning resistance of the steered wheels). On the frame structure of the stand, made in the form of a one-sided base with a table, the Hydropanel and the electrical measurement and control panel are located. The hydraulic schematic diagram of the stand is located on the electrical measurement and control panel. Hydraulic equipment and devices are installed on the table, hydropanel and side surface of the stand. On the hydraulic panel, there are structural diagrams of the hydraulic booster devices under study. The MAZ-64229 type hydraulic booster devices are being tested at the stand (other types of hydraulic boosters can be installed on the stand at the request of the customer). The hydrostation included in the delivery set is made as a separate module.

The main devices installed on the stand and hydrostation:

• Three-phase asynchronous electric motor
• Gear pump
• Pressure filter
• Hydraulic pressure valves (two)
• Adjustable throttle
• Hydraulic cylinders (two)
• Steering mechanism with hydraulic distributor
• Three-line flow regulator (flow and pressure valve)
• Imitator of steering wheel resistance
• Simulator of malfunction of hydraulic booster

The stand has a non-rigid configuration. Requirements for the system of the studied subsystem are collected with the help of elastic pipelines with quick-disconnecting connections (QKH). The information and measurement system of the stand allows you to register pressure, flow, temperature, and time. Five microprocessor pressure sensors and one manometer, two integrating type flowmeters (speed and volume), and an electronic stopwatch are installed on the stand. The stand has a digital display of pressure measurement results.

Attached to the stand are:

• A set of methodical and technical documentation intended for the teaching staff
• Software

List of performed works:

1. Study of the structure of semi-integral hydraulic booster (MAZ-64229).
2. Study of the working characteristics of the gear pump.
3. Study of the characteristics of a three-line flow regulator.
4. Study of the characteristics of the hydraulic booster distributor.
5. Determination of the load characteristics of the hydraulic booster.
6. Diagnostics of the technical condition of hydraulic booster devices.

Technical characteristics:

• Power supply: 3 ~ 380/220 V, 50 Hz
• Power consumption: no more than 7.5 kW
• Working fluid: mineral oil
• Volume of working fluid: 25 dm³
• Maximum pressure in the hydraulic system: 10 MPa
• Overall dimensions of the stand:
  • Width: 1220 mm
  • Height: 1650 mm
  • Depth: 750 mm
• Overall dimensions of the pumping station:
  • Width: 650 mm
  • Height: 375 mm
  • Depth: 640 mm
• Weight of the stand: no more than 130 kg
• Weight of the pumping station: no more than 98 kg

1. Product Introduction

The electric power steering system training platform (electric type) is based on the front axle assembly of the car, and fully demonstrates the composition structure and working process of the electric power steering system and the front axle suspension system. It is suitable for the teaching needs of the school for the theory and maintenance training of the electric power steering system.

2. Functional characteristics

1. A real and operable automobile electric power steering system, which fully demonstrates the composition structure of the electric power steering system.
2. Adjust the speed output simulation knob to simulate the change of vehicle speed, turn the steering wheel left and right, and fully demonstrate the working process of the electric power steering.
3. The panel of the training platform adopts a 4mm thick high-grade aluminum-plastic plate that is resistant to corrosion, impact, pollution, fire and moisture, and the surface is treated with a special process of spraying primer; the panel is printed with a color circuit diagram that never fades; students can intuitively compare the circuit diagram with the real object to understand and analyze the working principle of the automobile electric power steering system.
4. The panel of the training platform is equipped with detection terminals, which can directly detect the electrical signals of the circuit components of the electric power steering system on the panel, such as resistance, voltage, current, frequency signals, etc.
5. The training platform is equipped with a diagnostic socket, which can be connected to a special or universal car decoder to read fault codes and clear fault codes for the electric power steering system.
6. The base of the training platform is welded with a steel structure, and the surface is sprayed with a self-locking caster device, which is flexible, safe, reliable, sturdy and durable.

3. Technical specifications

• Dimensions: 1700×1200×1800 mm (length×width×height)
• Input power: AC 220V±10% 50Hz
• Working power: DC 12V
• Working temperature: -40℃～+50℃
• Steel pipe: 40×40×3 mm
• Moving casters: 100×50 mm