CN201965193U - Grounding detection protection device of integrated power test vehicle - Google Patents

Abstract

The utility model discloses a grounding detection protection device of an integrated power test vehicle, comprising a hardware analog detection control module which is used for receiving the grounding impedance signal of a conductive tire and the direct grounding impedance signal of a frame; the hardware analog detection control module is connected with and controls an electrifying circuit; the electrifying circuit is also connected with and is controlled by a detection control module; the detection control module and the hardware analog detection control module are mutually connected; and the detection control module is used for acquiring the intermediate information of the hardware analog detection control module. The grounding detection protection device can detect the small difference between the grounding impedance of the conductive tire and the direct grounding impedance of the frame, so that the grounding reliability is effectively judged.

Description

Electric combined test car ground connection is detected protective device

Technical field

The present invention relates to a kind of high voltage electric power equip ment experimental technique field, be specifically related to a kind of electric combined test car ground connection and detect protective device.

Background technology

Electric combined test car is a kind of vehicular intensification computer control pilot system, is carrier with the automobile, and pilot system is installed in the car with modular construction, finishes experiment work by computer control.

Pilot system as above-mentioned vehicle-mounted instrument is the high-potting instrument, therefore the top priority that ground connection being guarantees personal safety and experiment work is finished smoothly reliably.

At present in the pilot system experiment work in the electric combined test car, mainly be artificial ground, this kind earthing method is the life and property loss that carelessness brought that keeps away unavoidable people.

The tire of electric combined test car originally is the insulation tire; the detection that whether is grounded that can be more or less freely; but the static that produces is discharged into ground for vehicle is in operation; the tire of existing power combined test car has changed conductive tyre into; this itself is a kind of progress; but in the power equipment experiment work, conductive tyre ground connection is not paid and is closed ground protection rules strict demand in the power test.And the direct ground connection of conductive tyre ground connection and vehicle frame, impedance ground has only minute differences.Convert the size of voltage signal to from impedance ground, existing measure can't have been offered an explanation whether closely safety ground.

Summary of the invention

For overcoming deficiency of the prior art; the object of the present invention is to provide a kind of electric combined test car ground connection to detect protective device; this ground connection is detected protective device can detect the minute differences of conductive tyre ground connection and the direct ground connection impedance ground of vehicle frame, thereby effectively judges whether reliable ground.

For solving the problems of the technologies described above, reach above-mentioned technical purpose, the present invention adopts following technical scheme:

A kind of electric combined test car ground connection is detected protective device; it comprises that one is used to receive the hardware simulation detection control module of conductive tyre ground connection and the directly grounded impedance signal of vehicle frame; described hardware simulation detects control module and connects control one executive circuit that powers on; the described executive circuit that powers on also connects and is controlled by a detection control module; described detection control module and described hardware simulation detect control module and interconnect, and described detection control module is used to gather the intermediate information that described hardware simulation detects control module.

Preferably, described detection control module also is connected with a host computer, and described host computer is used to carry out man-machine communication.

Further, described hardware simulation detects control module and comprises: the input impedance photoelectricity that a difference that is used to finish conductive tyre ground connection and the directly grounded impedance of vehicle frame is calculated is isolated sample circuit, one is used to finish the exponent arithmetic signal expansion circuit that described impedance difference is carried out the non-linear amplification of index, one is used to finish the signal filtering comparator circuit that the signal-pulse width automatic switching circuit and that converts the impedance contrast value signal after amplifying to pulse width is used to realize signal filtering and comparing function, described input impedance photoelectricity is isolated sample circuit and is connected described exponent arithmetic signal expansion circuit, described exponent arithmetic signal expansion circuit connects described signal-pulse width automatic switching circuit, described signal-pulse width automatic switching circuit connects described signal filtering comparator circuit, and described signal filtering comparator circuit connects the described executive circuit that powers on.

Further, described detection control module comprises a Single Chip Microcomputer (SCM) system, described Single Chip Microcomputer (SCM) system is provided with, one is connected in the signal sampling port after described input impedance photoelectricity is isolated sample circuit, one is connected in the exponent arithmetic port behind the described exponent arithmetic signal expansion circuit, one is connected in pulse-width samples port and behind signal-pulse width automatic switching circuit is used for the fuzzy operation control port that is connected with the described executive circuit that powers on, and described signal sampling, exponent arithmetic, pulse-width samples and paste s operation control are finished by the program of described Single Chip Microcomputer (SCM) system inside.

Preferably, described Single Chip Microcomputer (SCM) system connects one, light alarm module, and described sound, light alarm module are used for reminding operating personnel detecting instrument ground when bad, and notify described Single Chip Microcomputer (SCM) system to cut off all appts power supply, prevent to cause the accident because of imperfect earth.

Preferably, described Single Chip Microcomputer (SCM) system connects a LED instrument run indicator module, and described LED instrument run indicator module is used to indicate the instrument that is moving, and is convenient to operating personnel and gets information about.

The course of work of the present invention is as follows:

1) system boot initialization;

2) sampled input signal comprises described conductive tyre impedance ground and the direct impedance ground of vehicle frame;

3) carry out the signal exponent arithmetic;

4) do you judge that the gained result is less than setting value? if not, then instrument outage, the host computer of sound and light alarm, and notice simultaneously carries out man-machine current; If, sampling pulse width signal then;

5) do you judge that the gained pulse width signal is greater than setting value? if not, then instrument outage, the host computer of sound and light alarm, and notice simultaneously carries out man-machine current; If then instrument powers on, the notice host computer carries out man-machine communication, and operating personnel can get information about the instrument that is moving from described LED instrument run indicator module section simultaneously.

Electric combined test car ground connection of the present invention is detected protective device; adopt hardware computing automatic control circuit (hardware simulation detection control module) and scm software fuzzy operation to control (the both sides' case that detects control module) automatically; can finish the function of accurate judgement vehicle conductive tyre ground connection and the directly grounded impedance ground a shade of difference of vehicle frame, thereby right judgement goes out whether reliable ground of instrument.

Description of drawings

Fig. 1 is a theory diagram of the present invention.

The connection diagram of Fig. 2 specific embodiment of the present invention.

Fig. 3 is the exponent arithmetic signal expansion circuit figure of one embodiment of the invention.

Fig. 4 is the pulse width generation circuit diagram of an embodiment of invention.

Fig. 5 (a) has shown vehicle conductive tyre ground connection and the directly grounded original waveform of vehicle frame; Fig. 5 (b) is the non-linear amplifying circuit output waveform of process index.

The number in the figure explanation: 1. hardware simulation detects control module, and the executive circuit that 2. powers on 3. detects control module, 4. host computer, 5., the light alarm module, 6.LED instrument run indicator module, 101. input impedance photoelectricity is isolated sample circuit, 102. exponent arithmetic signal expansion circuits, 103. signals-pulse width automatic switching circuit, 104. signal filtering comparator circuit, 301. signal sampling, 302. exponent arithmetics, 303. pulse-width samples, 304. Single Chip Microcomputer (SCM) system, 305. stick with paste s operation control.

Embodiment

See also Fig. 1, shown in Figure 2; a kind of electric combined test car ground connection is detected protective device; it comprises that one is used to receive the hardware simulation detection control module 1 of conductive tyre ground connection and the directly grounded impedance signal of vehicle frame; described hardware simulation detects control module 1 and connects control one executive circuit 2 that powers on; the described executive circuit 2 that powers on also connects and is controlled by a detection control module 3; described detection control module 3 detects control module 1 with described hardware simulation and interconnects, and described detection control module 3 is used to gather the intermediate information that described hardware simulation detects control module 1.

Preferably, described detection control module 3 also is connected with a host computer 4, and described host computer 4 is used to carry out man-machine communication.

Further, described hardware simulation detects control module 1 and comprises: the input impedance photoelectricity that a difference that is used to finish conductive tyre ground connection and the directly grounded impedance of vehicle frame is calculated is isolated sample circuit 101, one is used to finish the exponent arithmetic signal expansion circuit 102 that described impedance difference is carried out the non-linear amplification of index, one is used to finish the signal filtering comparator circuit 104 that the signal-pulse width automatic switching circuit 103 and that converts the impedance contrast value signal after amplifying to pulse width is used to realize signal filtering and comparing function, described input impedance photoelectricity is isolated sample circuit 101 and is connected described exponent arithmetic signal expansion circuit 102, described exponent arithmetic signal expansion circuit 102 connects described signal-pulse width automatic switching circuit 103, described signal-pulse width automatic switching circuit 103 connects described signal filtering comparator circuit 104, and described signal filtering comparator circuit 104 connects the described executive circuit 2 that powers on.

Further, described detection control module 3 comprises a Single Chip Microcomputer (SCM) system 304, described Single Chip Microcomputer (SCM) system 304 is provided with, one is connected in signal sampling 301 ports after described input impedance photoelectricity is isolated sample circuit 101, one is connected in exponent arithmetic 302 ports behind the described exponent arithmetic signal expansion circuit 102, one is connected in the fuzzy operation that pulse-width samples 303 ports and behind signal-pulse width automatic switching circuit 103 are used for being connected with the described executive circuit 2 that powers on controls 305 ports, described signal sampling 301, exponent arithmetic 302, pulse-width samples 303 and paste s operation control 305 are finished by the program of described Single Chip Microcomputer (SCM) system 304 inside.

Preferably, described Single Chip Microcomputer (SCM) system 304 connects one, light alarm module 5, and described sound, light alarm module 5 are used for reminding operating personnel detecting instrument ground when bad, and notify described Single Chip Microcomputer (SCM) system 304 to cut off all appts power supply, prevent to cause the accident because of imperfect earth.

Preferably, described Single Chip Microcomputer (SCM) system 304 connects a LED instrument run indicator module 6, and described LED instrument run indicator module 6 is used to indicate the instrument that is moving, and is convenient to operating personnel and gets information about.

As shown in Figure 3, be the exponent arithmetic signal expansion circuit figure of one embodiment of the invention, it has selected low drift for use, low noise, the amplifier of high resistant input, and selected triode " to pipe ", the drift that comes compensation temperature to produce for use.Its output tabular form can prove:

$\mathrm{VO}=\frac{\mathrm{<figure-callout\; id="1"\; label="Rf\; R"\; filenames="DEST\_PATH\_HSB00000534356100021.png,DEST\_PATH\_HSB00000534356100032.png"\; state="\{\{state\}\}">Rf</figure-callout>}}{R}\mathrm{Vre}{10}^{-\frac{\mathrm{Vi}}{\mathrm{\&tau;}}}$

Vi=input signal in the formula; The Vre=reference voltage; τ=constant.

The output of exponent arithmetic signal expansion circuit is the half-sinusoid of a modification, shown in Fig. 5 (a) and Fig. 5 (b), has shown directly grounded original waveform of vehicle conductive tyre ground connection and vehicle frame and the non-linear amplifying circuit output waveform of process index.From Fig. 5 (a) and Fig. 5 (b) as can be seen, two kinds of situations, through the non-linear amplification of index, their amplitude is mutually far short of what is expected with the bottom, as shown in Figure 4, is the pulse width generation circuit of one embodiment of the invention, it is a comparator circuit in essence, under the directly grounded situation of vehicle frame, give that to transfer variohm W2 to make pulse width be 2.5mS, be about 1mS during electric tire ground connection.Through behind the comparer, obtained the different pulse of width.Because pulsewidth differs greatly, can after comparing, just can judge accurately that vehicle conductive tyre ground connection still is the directly grounded ground connection of vehicle frame simply by the filtering integration, electrical relay in the control is the instrument power supply.

Below only be concrete exemplary applications of the present invention, protection scope of the present invention is not constituted any limitation.All employing equivalents or equivalence are replaced and the technical scheme of formation, or any to conductive tyre ground connection of vehicle described in the present invention and the directly grounded detection method of vehicle frame, all drop within the rights protection scope of the present invention.

Claims (6)

1. an electric combined test car ground connection is detected protective device; it is characterized in that; comprise: one is used to receive the hardware simulation detection control module (1) of conductive tyre ground connection and the directly grounded impedance signal of vehicle frame; described hardware simulation detects control module (1) and connects control one executive circuit (2) that powers on; the described executive circuit that powers on (2) also connects and is controlled by a detection control module (3), and described detection control module (3) detects control module (1) with described hardware simulation and interconnects.

2. electric combined test car ground connection according to claim 1 is detected protective device; it is characterized in that; described hardware simulation detects control module (1) and comprising: the input impedance photoelectricity that a difference that is used to finish conductive tyre ground connection and the directly grounded impedance of vehicle frame is calculated is isolated sample circuit (101); one is used to finish the exponent arithmetic signal expansion circuit (102) that described impedance difference is carried out the non-linear amplification of index; one is used to finish the signal filtering comparator circuit (104) that the signal-pulse width automatic switching circuit (103) and that converts the impedance contrast value signal after amplifying to pulse width is used to realize signal filtering and comparing function; described input impedance photoelectricity is isolated sample circuit (101) and is connected described exponent arithmetic signal expansion circuit (102); described exponent arithmetic signal expansion circuit (102) connects described signal-pulse width automatic switching circuit (103); described signal-pulse width automatic switching circuit (103) connects described signal filtering comparator circuit (104), and described signal filtering comparator circuit (104) connects the described executive circuit that powers on (2).

3. electric combined test car ground connection according to claim 1 is detected protective device; it is characterized in that; described detection control module (3) comprises a Single Chip Microcomputer (SCM) system (304); described Single Chip Microcomputer (SCM) system (304) is provided with; one is connected in signal sampling (301) port after described input impedance photoelectricity is isolated sample circuit (101); one is connected in exponent arithmetic (302) port behind the described exponent arithmetic signal expansion circuit (102), and one is connected in pulse-width samples (303) port and behind signal-pulse width automatic switching circuit (103) is used for fuzzy operation control (305) port of being connected with the described executive circuit that powers on (2).

4. detect protective device according to claim 1 or 2 or 3 described electric combined test car ground connection, it is characterized in that described detection control module (3) also is connected with a host computer (4).

5. electric combined test car ground connection according to claim 3 is detected protective device, it is characterized in that, described Single Chip Microcomputer (SCM) system (304) connects one, light alarm module (5).

6. electric combined test car ground connection according to claim 3 is detected protective device, it is characterized in that, described Single Chip Microcomputer (SCM) system (304) connects a LED instrument run indicator module (6).

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