CN2482695Y

CN2482695Y - Special test pencil for vehicle

Info

Publication number: CN2482695Y
Application number: CN 01230940
Authority: CN
Inventors: 刘阳
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-06-30
Filing date: 2001-06-30
Publication date: 2002-03-20
Anticipated expiration: 2011-06-30

Abstract

The utility model relates to a tester, in particular to a special test pencil for vehicles, the special test pencil comprises a pencil shell, a probe and a testing display. A clamp is arranged at the other end of a lead wire of a tail cover of the pencil shell;; the testing display comprises a polarity protection circuit for display, a sampling circuit comprising resistors and receiving signals from the polarity protection circuit, a voltage regulator circuit of a sampling circuit, a voltage comparison circuit comprising comparison integrated chips and comparing the obtained sampling, and a base circuit and an output display circuit comprising resistors. The utility model is applicable for vehicles with 12V and 24V power supplies.

Description

The automobile specified test pencil

The utility model relates to a kind of testing tool, particularly a kind of automobile specified test pencil.

Electronic device applications on the vehicle is more and more.When the vehicle circuit breaks down, particularly when fuse burn, when suspecting that generator has failure and other reasons, can only be with the instrument inspection and the judgement of multimeter or lamp and so on, and these testing tools relatively volumes are bigger, carry very inconvenience with car, use also inconvenient.Recorded and narrated a kind of " automotive multipurpose test pencil " in the Chinese patent the 91208786.2nd, a kind of relatively dexterousr test pencil is also disclosed in this technical scheme, but this test pencil is owing to adopted transistor in circuit, in the process of test, be easy to generate temperature drift like this, make the result of test can produce certain difference; This in addition test pen can only be tested a kind of magnitude of voltage.

It is a kind of simple in structure, small and exquisite that the purpose of this utility model is to provide, and test result is accurate, the automobile specified test pencil that the test voltage scope is wide.

The purpose of this utility model is achieved in that

A kind of automobile specified test pencil, it is made up of a shell, probe and detection display device, is provided with a lead at the tail-hood place of described shell, and the other end of lead is provided with anchor clamps; Reference circuit that described detection display device comprises that mu balanced circuit, one that a polar protective circuit that indication is provided, acceptance transmit the sample circuit that signal is made of resistance, a sample circuit from polar protective circuit compare the sampling of being carried out and the voltage comparator circuit that is made of integrated chip relatively, one are made of resistance and one output display circuit; Described voltage comparator circuit comprises that is used for the power supply integrated unit IC of conversion automatically ₁, three integrated unit IC that are used to export indication ₂, IC ₃, IC ₄, and at described three the integrated unit IC that are used to export indication ₂, IC ₃, IC ₄On be connected with light emitting diode D respectively ₅, D ₆, D ₇The positive level of described probe connection circuit, electric current is through resistance R ₁, emitting red light diode D ₁Form the loop with negative level, by the pilot lamp D that is connected in parallel in the loop ₁, diode D ₂Form level property holding circuit; Sample circuit is by the resistance R that is connected in parallel in the loop ₂, R ₃, R ₄, R ₅, R ₆Form; Mu balanced circuit is by BG, D ₈, R ₁₄Form, and to by integrated chip IC ₁, IC ₂, IC ₃, IC ₄The voltage comparator that constitutes, by R ₇, R ₈, R ₉, R ₁₀The reference circuit and the output circuit that constitute provide power supply.Afterbody at described shell is provided with draw-in groove, and described tail-hood is stuck in the described draw-in groove.Afterbody at the circuit board of described enclosure is provided with the wire bonds metal.

The utility model can be applicable to the vehicle of 12V and 24V power supply simultaneously, and volume is small and exquisite, is easy to carry, and is durable in use, and test result is more accurate, and waterproof, shockproof, and is simple to operate, intuitive display is understandable.

Accompanying drawing 1 is a structural representation of the present utility model

Accompanying drawing 2 is a circuit diagram of the present utility model

The utility model is further detailed for embodiment of the present utility model with accompanying drawing 1,2 below:

The utility model is made up of a shell 1, probe 9 and detection display device, and described shell 1 can use ambroin to make; Tail-hood 3 places at described shell 1 are provided with a lead 5, and the other end of lead 5 is provided with anchor clamps 7, and anchor clamps 7 can be crocodile clips; Afterbody at described shell 1 is provided with draw-in groove 8, and described tail-hood 3 is stuck in the described draw-in groove 8.Afterbody at the circuit board 6 of described shell 1 inside is provided with wire bonds metal 4.The negative pole that when using crocodile clip 7 is clipped in power supply gets final product.Light emitting diode D with redness ₁Be placed in probe 9 near, as pilot lamp, another red light emitting diodes, green light emitting diode and yellow light emitting diode then divide the surface that is located at a shell 1.The light emitting diode of each color is all represented the scope of a different magnitude of voltage.

Principle of work of the present utility model is as follows:

When nib connects positive level, electric current is through R ₁, emitting red light diode D ₁Form loop, pilot lamp D with negative level ₁Bright, electric current passes through D simultaneously ₂Forward conduction oppositely ends, and forms level property holding circuit, to sample circuit R ₂, R ₃, R ₄, R ₅, R ₆With mu balanced circuit power supply, BG, D ₈, R ₁₄Mu balanced circuit is to voltage comparator ic ₁, IC ₂, IC ₃, IC ₄, reference circuit R ₇, R ₈, R ₉, R ₁₀Provide power supply with output circuit.When input voltage is lower than 19V, voltage is through R ₂, R ₃Dividing potential drop is with comparer IC ₁Reference voltage relatively, when input voltage is lower than reference voltage, IC ₁Output ends.Be higher than 19V as input voltage, through R ₂, R ₃Dividing potential drop, IC ₁Input voltage is higher than reference voltage, IC ₁The output conducting is with the R in another group sample circuit ₆Shorted to earth is formed 12V or 24V power supply automatic switching circuit.When being higher than 11.4V, input voltage is lower than 12.8V, IC ₁End, voltage is through R ₄, R ₅, R ₆Dividing potential drop is to comparer IC ₂, IC ₃, IC ₄Input provides the sampling current potential, at this moment IC ₂, IC ₃The input current potential be lower than reference potential, output ends, IC ₄The input current potential is higher than reference potential, the output conducting, and electric current is through R ₁₃, yellow light-emitting diode D ₇, IC ₄Form the loop, D ₇Amber light is bright.When being higher than 12.8V, input voltage is lower than 14.8V, IC ₁End, voltage is through R ₄, R ₅, R ₆Dividing potential drop is to comparer IC ₂, IC ₃, IC ₄Input provides the sampling current potential, at this moment IC ₂The input current potential be lower than reference potential, output ends, IC ₃, IC ₄The input current potential is higher than reference potential, the output conducting, and electric current one tunnel is through R ₁₂, green LED D ₆, IC ₃Form the loop, another road is through R ₁₃, D ₄, IC ₃, D ₇, IC ₄Form the loop, and this moment D ₄Forward conduction, its voltage drop is lower than D ₇Luminous voltage, D ₇Amber light goes out, D ₆Green light is bright.When input voltage is higher than 14.8V, IC ₁End, voltage is through R ₄, R ₅, R ₆Dividing potential drop is to comparer IC ₂, IC ₃, IC ₄Input provides the sampling current potential, at this moment IC ₂, IC ₃, IC ₄The input current potential is higher than reference potential, and the output conducting is because of D ₃, D ₄Clamping action (the top description), yellow lamp D ₇Lamp D with green ₆Go out, electric current is through R ₁₁, red light emitting diodes D ₅, IC ₂Form the loop, D ₅Red colored lamp is bright.When being higher than 22V, input voltage is lower than 25V, IC ₁Conducting, voltage is through R ₄, R ₅, dividing potential drop, to comparer IC ₂, IC ₃, IC ₄Input provides the sampling current potential, and comparer and output circuit are with aforesaid identical.When being higher than 25V, input voltage is lower than 29.4V, IC ₁Conducting, voltage is through R ₄, R ₅, dividing potential drop, to comparer IC ₂, IC ₃, IC ₄Input provides the sampling current potential, and comparer and output circuit are with aforesaid identical.When input voltage is higher than 29.4V, IC ₁Conducting, voltage is through R ₄, R ₅, dividing potential drop, to comparer IC ₂, IC ₃, IC ₄Input provides the sampling current potential, and comparer and output circuit are with aforesaid identical.

Application of the present utility model is as follows:

The engine unstart, amber light bright (11.4V-12.8V or 22V-25V).If engine starts, faults such as generator is bad, and generator circuit is bad are described.After piloting engine, green light bright (12.8V-14.8V or 25V-29.4V) illustrates that generator is working properly.After piloting engine, red light bright (greater than 14.8 or 29.4V), illustrate that generator power output is excessive, to work dangerous this moment, easily burns other circuit and device.Near near the written metal an independent red colored lamp is arranged, it is called pilot lamp.Its effect is to be used for read failure coding etc., how does not appoint the generator duty, as long as power supply is arranged, and all can be luminous.If be connected on the power supply, have only pilot lamp bright, other lamp does not work, and the accumulator electric-quantity deficiency is described, the difficulty of piloting engine.Newly purchase battery in this way, possible poor-performing.If all lamps do not work entirely, illustrate that accumulator does not have fully.Encode with the pilot lamp read failure: with the negative level of a termination battery of Band clamp or connect on the car body metal, dodge a sign indicating number interface, read and dodge the short number of times of code length, consult the content of failure code, can analyze its trouble location with the contact of electroscope nib.Duty with pilot lamp inspection insurance, big lampet, taillight etc.: energized, with the negative level of a termination battery of Band clamp or connect on the car body metal, when insuring two ends with the contact of electroscope nib, when wherein having only an end bright, illustrate that insurance has problem, all bright when two ends, the basic non-fault of insurance is described.When contacting bulb two termination contact with the electroscope nib, wherein an end is bright, and the other end does not work, and circuit non-fault (fault goes out in bulb or loose contact) is described.All bright or all do not work when two ends, illustrate that circuit has fault.Four comparer IC1, IC2, IC3, IC4 of the present utility model are integrated into a chip, can select existing LM339 for use.Of the present utility model small and exquisite in order to guarantee, most of components and parts on the circuit board can be selected patch form for use.

Claims

1, a kind of automobile specified test pencil, it is made up of a shell (1), probe (9) and detection display device, it is characterized in that locating to be provided with a lead (5) at the tail-hood (3) of described shell (1), and the other end of lead (5) is provided with anchor clamps (7); Reference circuit that described detection display device comprises that mu balanced circuit, one that a polar protective circuit that indication is provided, acceptance transmit the sample circuit that signal is made of resistance, a sample circuit from polar protective circuit compare the sampling of being carried out and the voltage comparator circuit that is made of integrated chip relatively, one are made of resistance and one output display circuit; Described voltage comparator circuit comprises that is used for the power supply integrated unit IC of conversion automatically ₁, three integrated unit IC that are used to export indication ₂, IC ₃, IC ₄, and at described three the integrated unit IC that are used to export indication ₂, IC ₃, IC ₄On be connected with light emitting diode D respectively ₅, D ₆, D ₇

2, the automobile specified test pencil described in claim 1 is characterized in that the positive level of described probe (9) connection circuit, and electric current is through resistance R ₁, emitting red light diode D ₁Form the loop with negative level, by the pilot lamp D that is connected in parallel in the loop ₁, diode D ₂Form level property holding circuit; Sample circuit is by the resistance R that is connected in parallel in the loop ₂, R ₃, R ₄, R ₅, R ₆Form; Mu balanced circuit is by BG, D ₈, R ₁₄Form, and to by integrated chip IC ₁, IC ₂, IC ₃, IC ₄The voltage comparator that constitutes, by R ₇, R ₈, R ₉, R ₁₀The reference circuit and the output circuit that constitute provide power supply.

3, the automobile specified test pencil described in claim 1 is characterized in that being provided with draw-in groove (8) at the afterbody of described shell (1), and described tail-hood (3) is stuck in the described draw-in groove (8).

4, the automobile specified test pencil described in claim 1 is characterized in that being provided with wire bonds metal (4) at the afterbody of the inner circuit board (6) of described shell (1).