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Steering Sub System Test
This machine offers efficient and flexible test solution to perform dynamic tests on complete steering sub-system. By simulating its real environment, the test system eval!uates accurately the steering behavior in any configuration.By simulating loads applied on steering wheel and steering rack, This test machine can performed relevant dynamic tests :
For characterization of steering column, two optional modules are available to perform measurement of twist rigidity, friction torque and homokinetic defects.
• Columns and steering assembly positioned in real
This test rig integrates three main actuators: configurations • High dynamic actuator to eval!uate steering behaviour • Power for steering assistance (electric or hydraulic) with CAN communication • User-friendly software with customizable interface • Steering column characterization with optional modules • Simulation of climatic conditions available, including mud sputtering one electric motor simulating driver’s action on steering wheel and two hydraulic cylinders applying load or displacement on steering rack. Each actuator can be closed loop controlled in displacement, speed or force. Hydraulic power pack is also available. Power assistance modules can be added either for hydraulic or electric assistance systems. Corresponding information are simulated through CAN communication to control vehicle electronic commands. Optional modules are also available to characterize steering column : . A sub-unit to provide torque and measure angle at the steering column end A sub-unit with low friction bearing & calibration arm STEERING WHEEL ACTUATOR It simulates the driver of the vehicle by providing active and reactive torque. It allows adjustments in every direction to meet vehicle configuration. • Max. torque at low speed 56 Nm • Min. angular velocity 0.1 °/s • Max. angular velocity 2000 °/s • Closed loop control in speed, torque or position The torque meter is calibrated for two different ranges: • Up to 50 Nm accuracy of 0.1 Nm • Up to 5 Nm accuracy of 0.05 Nm LOADING ACTUATOR ON STEERING RACK Loads on the steering rack are provided by two hydrostatic bearing cylinders. Each actuator can be adjusted in Z axis to match with real configuration. • Max. load 9 kN • Stroke 200 mm (LVDT position sensor) • Max. speed 0.5 m/s (0.3 m/s dynamic) Closed loop control in position / load • Precision ± 0,1% from 0 to 25 Hz • Frequency Max. 25 Hz ELECTRIC POWER SUPPLY FOR STEERING ASSISTANCE Electric power supply provides stable energy to the EPS & HPS in this electric cabinet. This station is mobile and can be used either on characterization or durability zone. Voltage and current are controlled by test cycle. This station is also connected to the BMC system in order to communicate with CAN bus. Two input signals are simulated to control electronic vehicle command: vehicle speed and engine speed. • Power Constant regulation • Adjustable Voltage 0 to 18 V • Current output 150 A • Voltage or intensity Control by outside input Intensity measurement • Type Shunt measurement • Range 200 A • Accuracy 0.5% HYDRAULIC POWER SUPPLY FOR STEERING ASSISTANCE We can provide hydraulic power for steering assistance. Hydraulic circuit should be similar to vehicle circuit volume, about 1 liter. Flow, pressure and temperature measurements are integrated in the circuit. When real pump of hydraulic power assistance is connected, an asynchronous motor providing variable speed drives it. The pump is fixed on the motor by an interface. Several different interfaces can be provided. • Speed 0 to 1500 rpm • Power 7.5 kW • Torque 49 Nm simulate sensors or required information for ECU. The communication flow is created through CAN protocol. DBC files can be imported. Voltage measurement • Full Scale 20 V • Accuracy 0.1% FS For characterization of steering column, two optional modules are available to perform measurement of twist rigidity, friction torque and homokinetic defects. Sub-unit providing torque and measuring angle at the column’s end When the system is used without steering rack, this module provides torque on the column’s end through an electrical Brushless servo-motor: • Max. torque in rotation 10.6 Nm • Max. angular velocity 2000 °/s • Inertia 0.023 kg.m² • Feedback accuracy 0.1 Nm (in torque, in static) Low friction sub-unit This module is used for tests without steering rack which require low residual friction. It can be oriented in order to realize angular measures. Its rotation can be locked. • Setting in RY ± 45° • Setting in RZ ± 360° • Only 0.03 Nm residual friction torque in pinion shaft bearing Control System Motion CONTROLLERThe Motion controller is used to control the complete test system. It provides closed loop control for each axis, conditioning for sensor signals and integrates data acquisition module. Many types of sensors can be plugged, such as torquemeter, load cell, LVDT, flowmeter, pressure and temperature sensors, etc… For steering assistance system, full communication under CAN protocol is available. A remote control with programmable display is available for remote operation and monitoring. MOTION CONTROL SOFTWARE Motion control software which provides powerful control functions in a user-friendly environment. The Motion control software provides an easy-to-use “drag and drop” environment for building standard and non-standard sequences. In this environment, it is possible to link basic processes, including function generation (sinus, square, triangle, pause, imported file, etc…), data acquisition, events, and triggers, to quickly and easily build complex tests. Moreover, specific function provides the possibility to create customized control screens for test monitoring with graphical representation of any channel. Test report and standard data export are available too. |
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