CN202997567U

CN202997567U - Vehicle alternator phase signal filter

Info

Publication number: CN202997567U
Application number: CN2012205236939U
Authority: CN
Inventors: 王立军; 金雯芬
Original assignee: (suzhou) Automotive Electric Appliance Co Ltd
Current assignee: (suzhou) Automotive Electric Appliance Co Ltd
Priority date: 2012-10-12
Filing date: 2012-10-12
Publication date: 2013-06-12
Anticipated expiration: 2022-10-12

Abstract

Provided is a vehicle alternator phase signal filter, installed on an alternator phase signal W interface. The vehicle alternator phase signal filter comprises an input interface, an output interface, a grounding terminal, and a filter connecting an input terminal and an output terminal. The vehicle alternator phase signal filter is simple in structure, and is easy to realize. The vehicle alternator phase signal filter can be installed on an existing alternator. Electrical functions can satisfy rotating speed signal requirements of different instrument panels. Component cost is much lower than existing improved schemes. The vehicle alternator phase signal filter has high reliability, and has passed actual road test experiments and vehicle loading tests. A problem of shaking of a revolution meter is improved fundamentally.

Description

A kind of automobile current generator phase signals filter

Technical field

The utility model relates to the car electrics electronic applications, particularly relates to a kind of automobile current generator phase signals filter.

Background technology

Heavily block at present automobile current generator phase signals W terminal, major function is to provide the automobile rotational speed signal, is connected in the tachometer of automobile instrument panel.Due to automobile when low speed or idle and the little electric current, generator speed is also corresponding lower, the shake chatter appears in the waveform occasional of phase signals W, it is the difference (seeing Figure 1A) bigger than normal of peak value and valley, cause revolution speed meter pointer contingency to swing (seeing Figure 1B), the vision that makes the mistake to the driver.

In order to get rid of the impact of unnecessary wrong vision, need to take measures to make revolution speed meter pointer steadily to move when the little electric current of low speed, do not allow to occur unexpected fluctuation.For these problems, following several solution is arranged at present:

It is a kind of that to be automobile be provided with filter to the electronic circuit of panel board inside, solve the problem of input signal fluctuation, as shown in Figure 2, take steyr king instrument as example: the W phase line ripple signal P19 of generator enters circuit and removes the negative half period positive pulse through R12 current limliting R13 through the D6 diode, C11, R11 enters UTC7698 inside after forming low-pass filtering.

Another kind is that generator adopts multifunction regulator, the W signal is not directly to be taken from the generator phase signals, as shown in Figure 3, take the circuit diagram of German Man truck as example: the W signal is not directly to come from the generator phase signals, but controls in adjuster inside the square-wave voltage signal that obtains by transistor switch.

Still there are a lot of shortcoming and defect in above-mentioned solution, and is specific as follows:

(1) only panel board is carried out filter design, can not well cover all clients, brought a lot of extra costs for the management of client's product, and also be unfavorable for the maintenance and repair of after market, and cost is higher.

The utility model content

For solving the problems of the technologies described above, the purpose of this utility model is to provide a kind of simple in structure, easily realizes, cost is low, the automobile current generator phase signals filter of good stability.

For realizing above-mentioned utility model purpose, the technical scheme that the utility model provides is:

A kind of automobile current generator phase signals filter is arranged on generator phase signals W interface, comprises input interface, output interface, earth terminal, and the filter that connects input and output.

Further, described input interface and generator phase signals W interface are suitable.

Further, described output interface is connected with automobile speed indicator.

Further, described filter is pi type filter.

Further, described pi type filter is low pass RC filter circuit.

Further, the filter circuit of described pi type filter comprises resistance R 1, resistance R 2 and the first filter capacitor C, electric current enters from input, by the first filter capacitor C filtering, after by resistance R 1 and resistance R 2 dividing potential drops, export the tachometer of automobile to by output.

Further, described resistance R 1=1K, described resistance R 2=1K, described the first filter capacitor C=0.068 μ F.

Further, also comprise the housing of integral type design, on described housing, correspondence arranges input port, output port and grounding ports, and enclosure interior has cavity, settles filter in described cavity.

Adopt technique scheme, the beneficial effects of the utility model have:

Automobile current generator phase signals filter construction provided by the utility model is simple, easily realize, can realize installing on existing generator, electric function can satisfy the tach signal requirement of different instrument dish, and component costs is well below existing improvement project, reliability is high, has passed through actual road and has had a try and test and entrucking checking, turns the table jitter problem and is fundamentally improved.

Description of drawings

Figure 1A is that the shake schematic diagram occurs the prior art tachometer dial;

Figure 1B is prior art voltage dithering schematic diagram;

Fig. 2 is steyr king gauge internal circuit diagram;

Fig. 3 is the generator circuit figure of German Man truck;

Fig. 4 is the utility model structural representation;

Fig. 5 is the utility model experimental circuit;

Fig. 6 the utility model filter circuit diagram;

Fig. 7 is the utility model one embodiment schematic diagram.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that structure chart described herein and specific embodiment only in order to explaining the utility model, and be not used in restriction the utility model.

Fig. 4 is structural representation of the present utility model, as shown in Figure 4, and a kind of automobile current generator phase signals filter, be arranged between the tachometer of generator phase signals W interface and automobile, its shell designs for integral type, has input port, output port and grounding ports, enclosure interior has cavity, settle filter in described cavity, corresponding body comprises input interface, output interface, earth terminal, and the filter that connects input and output.Described input interface is placed in the input port of housing, described output interface is placed in the output port of housing, described earth terminal is placed in the earth terminal of housing, described input interface and generator phase signals W interface are suitable, described output interface is connected with automobile speed indicator, and described filter is the low pass RC filter circuit of pi type filter.

Fig. 6 is the circuit diagram of the utility model filter, the filter circuit of described filter comprises resistance R 1=1K, resistance R 2=1K and the first filter capacitor C=0.068 μ F, electric current enters from input, by the first filter capacitor C filtering, after by resistance R 1 and resistance R 2 dividing potential drops, export the tachometer of automobile to by output.

As shown in Figure 5, automobile current generator phase signals filter provided by the utility model is arranged on generator phase signals W end, the phase signals W that draws is accessed the tachometer of panel board, and oscilloscope is installed is carried out waveforms detection, the oscillogram on oscilloscope is seen Fig. 7.As can be seen from Figure 7, oscilloscope display W output maximum voltage difference is 3.6V, and when engine speed 550RPM was following, slight little amplitude jitter once in a while can occur the panel board revolution speed meter pointer.Yet the truck idling speed all more than 600RPM, that is to say, this programme also can solve tachometer contingency vibration problems of the prior art.

The shell of automobile current generator phase signals filter provided by the utility model, also can be arranged to other form, the inner cavity that forms, be provided with input port on described shell, output port, grounding ports, described input port is settled input interface, described output port is settled output interface, grounding ports ground connection.

The above embodiment has only expressed execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.Should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.

Claims

1. an automobile current generator phase signals filter, is characterized in that: be arranged on generator phase signals W interface, comprise input interface, output interface, earth terminal, and the filter that connects input and output.

2. automobile current generator phase signals filter according to claim 1, it is characterized in that: described input interface and generator phase signals W interface are suitable.

3. automobile current generator phase signals filter according to claim 1 and 2, it is characterized in that: described output interface is connected with automobile speed indicator.

4. automobile current generator phase signals filter according to claim 1, it is characterized in that: described filter is pi type filter.

5. automobile current generator phase signals filter according to claim 4, it is characterized in that: the filter circuit of described pi type filter comprises resistance R 1, resistance R 2 and filter capacitor C, electric current enters from input, by filter capacitor C filtering, after by resistance R 1 and resistance R 2 dividing potential drops, export the tachometer of automobile to by output, the negative pole of described filter capacitor C is communicated with ground connection with earth terminal.

6. automobile current generator phase signals filter according to claim 5, is characterized in that: described resistance R 1=1K, described resistance R 2=1K, described filter capacitor C=0.068 μ F.

7. arbitrary described automobile current generator phase signals filter in 2,4,5,6 according to claim 1,, it is characterized in that: the housing that also comprises the integral type design, on described housing, correspondence arranges input port, output port and grounding ports, enclosure interior has cavity, and described filter is placed in cavity.

8. automobile current generator phase signals filter according to claim 3, it is characterized in that: also comprise the housing of integral type design, on described housing, correspondence arranges input port, output port and grounding ports, enclosure interior has cavity, and described filter is placed in cavity.