RU215287U1 - Stand for studying the characteristics of the electromechanical power steering - Google Patents

Abstract

The utility model relates to educational and laboratory stands and can be used to study the operation of electromechanical power steering.

The technical result of using the proposed stand is to consolidate knowledge of the design of an electromechanical power steering, acquire practical skills in studying the characteristics of an electric power steering motor, a torque sensor, studying the operation of an electric power steering at different vehicle speeds, as well as methods for detecting simulated defects.

The specified technical result is achieved by the fact that in order to consolidate knowledge of the design of the electromechanical power steering, the stand is equipped with toggle switches that allow you to control the operation of the electric power steering as on a real car, indicators of the speed and voltage of the on-board network, as well as a pointer torque wrench to create torque at the input of the electric power steering, acting as a steering wheels. To acquire practical skills in studying the characteristics of the electric amplifier motor, the stand is equipped with a diagnostic connector installed on the front panel, to which an external diagnostic device is connected that reads information from the electronic control unit and transmits readings to the freely distributed OpenDiag program on the Android platform.

The skills of determining the characteristics of a torque sensor are acquired in the process of graphical plotting of the dependence of the voltage at the output of the sensor (determined with a multimeter) from the torque at the output of the electric amplifier (determined with a torque wrench). To study the operation of the electric power steering at different speeds of the vehicle, a pulse generator is connected to the stand and for the signal frequency, readings are taken from the torque wrenches at the input and output of the electric booster. To detect possible malfunctions of the electric power steering, the speed sensor, the torque sensor or the electric motor block are turned off, which leads to the formation of a fault code by the electric power steering control unit. 2 w.p. f-ly, 7 ill.

Description

The utility model relates to educational and laboratory stands and can be used to study the operation of an electromechanical power steering.

The electromechanical power steering is installed on most cars (more than 80%). It is based on an electromechanical system in which various malfunctions can occur during operation. Diagnostics and knowledge of its device is a very important problem. The relevance of electric power steering in the future will only increase due to the development of systems such as parking assistant, autopilot, and so on.

Known laboratory stand "Laboratory stand" Electric power steering VAZ 1118", made in the form of a floor frame structure, representing a set of mutually functioning elements of the body, front suspension, chassis and power steering of a front-wheel drive vehicle of the VAZ brand.

The disadvantage of this stand is the high cost, the inability to determine defects, as well as large overall dimensions.

A well-known stand for testing the electromechanical power steering of a vehicle (RU 32265 U1), containing a table for installing the test product, which is connected through the docking points with a loading device, the movable part of which is connected to the table, characterized in that the loading device is equipped with a shaft installed in its supports by a drum, on the axis of which a roller with a rope attached to it is fixed, and the lower part of the table is equipped with a suspension with an adjustable load connected through a bracket to the roller and rope.

The disadvantage of this invention is the focus on industrial testing, large overall dimensions, and the impossibility of concretizing defects.

A well-known bench-simulator for determining faults in the engine control system (RU 96277 U1), containing the instruments of the engine control system, characterized in that all devices are displayed on one panel and there is a fault input system.

The disadvantage of this invention is outdated hardware, the impossibility of taking instrument readings, constructing and analyzing functional dependencies, as well as the possibility of using only for engine control systems.

The advantages of the developed stand include the consolidation of knowledge of the design of the electromechanical power steering, the study of methods for detecting simulated defects, the acquisition of skills in determining the characteristics of the built-in torque sensor, the study of the operation of the electric power steering at different vehicle speeds.

Training stand (Fig. 1), the supporting structure of which is a frame welded from a profile pipe and corners, to which an electric power steering is screwed, the protruding end of the input shaft of which is articulated with the handle of a torque wrench, on the front panel of the stand there are controls and indicators of it work, a diagnostic connector and a Check Engine warning lamp, allowing you to detect and identify simulated malfunctions of the electric amplifier.

On the top panel of the stand (Fig. 2) there is an electric power steering (pos. 1). On the front panel of the stand are located: a fuse box for protecting the electric motor from overloads (pos. 2); sockets for connecting a pulse generator (pos. 3), simulating the operation of a car; voltage indicator (pos. 4); multimeter connection terminals (pos. 5); bench power switch (pos. 6); power switch of the electric booster control unit for simulating engine start (pos. 7); emergency switch (pos. 8); control lamp "Check Engine" (pos. 9); diagnostic connector for connecting an external diagnostic device (pos. 10); movement speed indicator (pos. 11); vehicle speed controller (pos. 12); viewing window for monitoring dynamometer readings (pos. 13).

Stand for studying the characteristics of the electric power steering operates as follows (Fig. 3). Power is supplied to the stand by connecting the terminals to the terminals of an external storage battery (12 V) observing the polarity. The voltage of the on-board network is controlled by an indicator (Fig. 2, pos.4). Attached to the sockets of the stand (Fig. 2, pos.3) the outputs of an external pulse generator to simulate the signals of the sensors of the crankshaft speed and vehicle speed. After switching the switch (Fig. 2, pos.6) to the "On" position the control lamp "Check Engine" (Fig. 2, pos. 8) lights up, indicating that the electromechanical amplifier is ready for operation.

To start the operation of the stand, using the toggle switch (Fig. 2, pos. 7), the electric amplifier is switched on, while the “Check Engine” lamp should go out. To study the characteristics of the electric amplifier, a force is created on the handle of the pointer torque wrench, determining the magnitude of the moment on its scale. The moment developed by the electric amplifier is determined by the scale of the measuring mechanism. A graphical representation of the obtained dependencies is shown in Fig. four.

To simulate malfunctions of the electric amplifier, it is possible to turn off the speed sensor, torque sensor or motor block. In this case, the control unit of the electric booster generates fault codes and transmits them to an external diagnostic device through the diagnostic connector (Fig. 2, pos.10). To display fault codes, the open software OpenDiag on the Android platform is involved. A fragment of the application screen is shown in Fig. 5.

To study the output characteristic of the torque sensor, a multimeter is connected to the terminals of the front panel of the stand. The sensor voltage depends on the moment developed by the electric amplifier. An example of the relationship is shown in Fig. 6.

The specified technical result is achieved by the fact that in order to consolidate knowledge of the design of the electromechanical power steering, the stand is equipped with toggle switches that allow you to control the operation of the electric power steering as on a real car, indicators of the speed and voltage of the on-board network, as well as a pointer torque wrench to create torque at the input of the electric power steering, acting as a steering wheels. To study methods for detecting simulated defects, the stand is equipped with a diagnostic connector installed on the front panel, to which an external diagnostic device is connected, which reads information from the electric booster control unit and transmits fault codes to the freely distributed OpenDiag program on the Android platform.

The skills of determining the characteristics of the built-in torque sensor are acquired in the process of graphical plotting of the dependence of the voltage at the test bench terminals on the torque at the output of the electric amplifier (determined using a torque scale). The study of the operation of the electric power steering at different vehicle speeds is achieved by connecting a pulse generator to the sockets and plotting graphical dependences of the moment on the steering wheel from the moment developed by the electric power steering for given vehicle speeds.

Fig. 1 General view of the stand

Fig. 2 Arrangement of stand elements

Fig. 3 Connecting the measuring equipment to the stand

Fig. 4 Graphs of dependence of the torque of the electric amplifier

Fig. 5 Application screen snippet

Fig. 6 Characteristics of the torque sensor

Thus, the training stand for studying the characteristics of an electromechanical power steering allows you to acquire practical skills in studying the operation of an electromechanical power steering, including methods for detecting simulated defects.

Claims (3)

1. A training stand for studying the characteristics of an electromechanical power steering, the supporting structure of which is a frame welded from a shaped pipe and corners, to which the electric power steering is screwed, the protruding end of the input shaft of which is articulated with the handle of a pointer torque wrench, bodies are located on the front panel of the stand controls and indicators of its operation, a diagnostic connector and a Check Engine warning lamp, which allow detecting and identifying simulated malfunctions of the electric amplifier. 2. The stand according to claim 1, characterized by the presence of sockets for connecting a pulse generator in order to plot graphical dependences of the moment on the steering wheel on the moment developed by the electric amplifier for given vehicle speeds, and the moment on the steering wheel is determined on the scale of a torque wrench, and the moment developed by an electric amplifier, - according to the scale of the measuring mechanism. 3. Stand according to claim 1, characterized by the presence of terminals on the front panel for connecting a multimeter in order to graphically plot the characteristics of the built-in torque sensor.

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