An experimental platform which can simulate the power supply, starting system, lighting system and signal system is designed for the body electrical appliances of Jetta GrX.

The actual work of the system and auxiliary electrical system. Through practical demonstration and troubleshooting, students can have a deeper understanding of each electrical component and the whole electrical system.

Understanding, so as to achieve the purpose of integrating theory with practice.

Keywords: simulation; Electrical appliances; Fault; Experimental platform; design

The wide application of electronic technology in automobiles makes the performance and structure of automobiles continue.

Improve. improve. On the basis of the original automobile electrical system, electronic technology is adopted.

Operation, on the one hand, improves the working performance and reliability of the original mechanical parts; on the other hand

Meet people's requirements for comprehensive performance of automobiles, and make automobiles more luxurious, advanced and comfortable.

Comfortable and safe.

Modern automobile widely uses electronic technology, its structure is more complicated, and the automobile

The proportion of electrical faults in operation is much higher than other faults, accounting for about 40%.

60%, which puts forward higher requirements for people engaged in automobile engineering related majors.

Beg. How to integrate theory with practice in the cultivation of automobile professional and technical personnel?

It is an important subject to improve engineering practice ability in combination with practice.

Design of 1 Jetta (GTX) Electrical Experiment Platform

1. 1 Overall design requirements of the experimental platform

The design of electrical experiment platform should meet the needs of teaching, that is, it has good demonstration.

Teaching effect and convenient control performance. At the same time, turn on related auxiliary functions.

Hair, so as to exercise students' engineering practice ability. Specific requirements are as follows

Seven aspects:

L) type selection. It has representative, universal and distinctive technical characteristics.

2) Serve the teaching. The teaching effect is simple and clear, and the control is convenient and quick; and

It has the function of fault diagnosis to improve students' engineering practice ability.

3) Layout of experimental platform. While considering the reasonable layout and compact structure,

Convenient for teaching; And pay attention to the power between electrical components when working.

Match.

4) Functional development of the experimental platform. The reserved external terminals are connected with plugs of other equipment.

Connectors provide the foundation and application level for the function expansion and component update of the experimental platform.

Entrance b

"Xi

1.2 Select vehicle type

Combined with the universality, representativeness and characteristics of design requirements, it is economical in middle and low grades.

This car is within the design consideration. Jetta GTX has been constantly developing and

Perfect, not only has high technical content, but also has many technical characteristics of its own, and it is

At present, China has the largest number of Volkswagen cars and the highest penetration rate.

First, it can represent the advanced level of China automobile industry to a great extent. have

It has certain representativeness and development and utilization prospects. On this basis, the vehicle model is designed.

Was chosen as Jetta GTX sedan.

1.3 design and verification of Jetta GTX electrical experimental platform

The design of electrical experiment platform should achieve good control performance and teaching effect.

It is required that the platform can be turned over and folded, and the support of electrical system components should be considered.

And the positioning is compact, the quality distribution of the table top is uniform, and the table top is neat and stable.

Sex, whether the moving part interferes with the fixed part and other factors.

1.3. 1 Desktop Design

The board design and manufacture of electric test-bed are mainly based on Jetta (Ting X car).

The wiring harness of Jetta's body is arranged, and the electrical components of Jetta's body are also referenced.

The layout of. This design can make rational use of the board space and make the best use of it.

Try to reproduce the position of each electrical component on the original vehicle. But because in the same place

On the plane, there is no spatial relationship, so it is the same as the original car in some details.

The actual location is different. The determination of plate size is mainly based on each

Shape, position and position size of electrical components. According to the layout of the wire harness and several kinds

The shape and position dimensions of the main components, and then preliminarily estimate the board size, and arrange it in

Determine the position of the component on the outline of the circuit board.

1.3.2 design of workbench

The design of electrical test platform is based on the layout and size of the circuit board.

And some parts need to be driven, and the electrical experimental platform is flat and reversible.

Folding, good stability, enough strength to support the board surface and can be turned over.

Convenient for teaching. Because the experimental platform is equipped with starter, generator and driving power generation.

The motor of the machine, in order not to increase the load on the board and facilitate turning, is under the board.

A U-shaped frame is installed on the workbench of the generator, and the wires at the output end of the generator are turned over along the table.

The hinge leads to the table, so that the generator and motor do not participate in the turnover.

1.3.3 material selection of the workbench

The material of the bench is 45 steel, and the strength and price are feasible. Every connection of the bench

The joint is welded, and its strength is not lower than that of raw materials, which can achieve the role of support.

Desktop and its fixing and stabilizing functions. In order to move conveniently, rubber wheels are used for lifting.

Play a role in shock absorption.

1.3.4 strength check of Taiwan Province frame

The platform has two stable positions, namely, a horizontal position and an angle of 70 with the horizontal direction.

The position of the included angle.

When 1) is in a horizontal state, the force of gravity on the platform support point.

Due to the material strength of the panel, the closing moment is zero, and the platform is in a stable state.

State.

1.4 Selection and positioning of accessories

1.4. 1 motor selection

Because the rated power of Jetta King's vehicle-mounted generator is 1.26kw, and the rated speed is.

The rotating speed is 600Or/ and n, so the rated power of the motor should be greater than.

Rated power of generator. Considering the working environment of the motor, Y series is selected.

Three squirrel-cage asynchronous motors based on.

In order to realize reliable transmission, according to the design purpose, the experimental platform is considered.

For teaching, short working hours and periodic work. Choose v-belt drive, belt drive

The working face will not be excessively worn in a short time, but the service life can be long enough.

It doesn't need to be replaced frequently.

1.4.2 Determination of generator and motor positions

Generator is one of the important parts of automobile electrical equipment and the power supply system of automobile.

The main power supply of the system, in the normal operation of the car, except for all electrical equipment (except

In addition to power supply, you can also charge the battery.

Because the working speed of the generator is about 6000r/ n, the mass is on the left side of Zkg.

Yes, the mass of the motor used with it is the largest among the electrical components (including electric ones).

Machine rotation), will have a certain impact on the stability of the whole experimental platform.

Considering the above reasons, determine the position of generator and motor under the board.

On the square underframe, the position of the generator can be clearly seen from the schematic diagram of the plate position.

The settings are shown in Figure 2.

[Ting X Electric made a series of choices, and some of them were replaced as follows:

1) The selected electrical components include battery, generator, headlight, instrument panel and medium.

Door control, electric window, etc.

2) Replacement of parts. Considering the practicality and aesthetics, some parts are adjusted.

For example, the horn switch on the car is the top cover of the steering wheel, while the test bench is used.

Key switch replacement; Considering the pertinence of teaching and the overall layout of the bench, choose

Replace the engine with an electric motor to drive the generator to rotate.

1.5.2 List of Common Faults of Jetta Electric Appliances

In order to realize the teaching and diagnosis function of the experimental platform, the common electrical system faults are

Summarize the obstacles and select representative faults as reference, so as to realize.

Setting and diagnosis of related faults. See table 1 for common faults of electrical system.

1.5.3 fault setting of electrical system of test bench

In order to achieve the teaching purpose, according to the common faults in table 1, an experimental platform was built.

There are many reasons for setting the fault open circuit, such as the light is not on: the battery may be charged.

Insufficient quantity, fuse may be blown, filament may be blown, and students have been diagnosed.

In this process, we will combine the circuit of the experimental platform to find out the specific reasons and problems.

Yes Understand the working principle of electrical system and improve the ability of engineering analysis.

Considering the limitations of the experimental platform, all fault points are set based on the circuit.

Fault, so that students can quickly find the fault with the circuit diagram.

2. Upgrade of Jetta electric test bench

As a teaching equipment with a certain service life, the follow-up function of the experimental platform is open.

Hair is very necessary. In order to fully realize the teaching function, it is required that in the process of use

Continuously improve the related functions of the experimental platform, and update and upgrade it regularly.

2. 1 The equipment itself is upgraded.

Electronic equipment is updated faster and faster, and it is eliminated on the basis of its original equipment.

Replace the equipment quickly to give full play to the potential of the equipment, and delay it constantly.

Extend the service life of the test bench and reduce unnecessary capital investment.

2.2 Upgrade by reserving the port or transforming its control line.

This can be done for some functions that cannot be realized by the experimental platform.

Demonstration, so that the same experimental platform can complete multiple experimental projects. For example, in reality.

The test bench is connected with the self-diagnosis port connector, and the converted diagnostic equipment can be connected.

The simulation diagnosis process fully demonstrates the function of data flow. If there is corresponding hair

Motive test bench, connect it, and you can truly demonstrate most cars.

Working conditions, this is actually a great expansion of the existing bench function.

2.3 Control function upgrade of experimental platform

According to the working characteristics of automobile electrical system sensor, a single chip microcomputer is adopted.

The computer programs the analog signal to realize the corresponding demonstration function. In the signal

Understand the signal characteristics of vehicle electrical system during debugging, and improve the electrical equipment of the test bed.

The system realizes the integration of electrical system and electronic control system. At the same time in trouble.

The process of setting and fault diagnosis is controlled by the remote controller, which is convenient to operate.

At the same time, it puts forward higher requirements for students' fault diagnosis ability, which can be to a greater extent.

Strengthen the cultivation of students' engineering practical application ability.

3 Conclusion

With the rapid development of automobile industry and the wide application of automobile control equipment, it is bound to

The quality requirements of employees in automobile related majors are getting higher and higher. For the better.

Adapting to the update of electronic technology, Jetta GTX automobile test-bed is very important to improve science.

Students' engineering practice ability will play a great role.

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