CN2101773U

CN2101773U - Automatic testing first aid device of ignition circuit fault for car

Info

Publication number: CN2101773U
Application number: CN 91225099
Authority: CN
Inventors: 陈全仁
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-09-12
Filing date: 1991-09-12
Publication date: 1992-04-15

Abstract

The utility model provides an automatic testing first aid device which is used for dealing with faults of an electronic ignition circuit of an internal combustion engine of an automobile. The utility model is characterized in that an ignition pulse signal detection circuit and an ignition multi-pulse signal source circuit are additionally connected in series between the input circuit and the power switching circuit of the existing electronic ignition circuit; when the fault of the electronic ignition circuit of an engine happens, the judgment of the detection circuit can be quickly obtained according to circumstances; high-speed pulse ignition signals can be generated by the detection circuit through the automatic start of the signal source circuit, and the engine operation can be maintained; all the operation of the utility model can be realized without engine stop, which provides convenience for the drivers and ensures the safe driving of the drivers.

Description

Automatic testing first aid device of ignition circuit fault for car

The utility model belongs to the design field of automobile internal Motronic control maps firing circuit, particularly a kind of automatic detection first aid device that is used to handle this electronic igniting circuit fault.

Existing automobile internal Motronic control maps firing circuit is generally by the formations such as firing pulse input circlult (to call input circlult in the following text), shaping circuit and power switch circuit that are serially connected between distributor triggering sensor and the spark coil.When firing circuit breaks down, as distributor spark sampling platinum pitting of contact, the platinum contact gap is excessive, distributor low voltage line short circuit (above i.e. what is called breaks down on the occasion of signal) and the wearing and tearing of distributor platinum bakelite, the platinum contact does not have the gap, distributor low voltage line open circuit (above is that so-called negative value signal breaks down) etc., the driver just must keep in repair by stop off, both influenced work, also very inconvenient, simultaneously also easily cause traffic congestion and security incident, to fire-fighting truck, ambulance, public security vehicle etc. some to have a vehicle of specific use especially unfavorable.

The purpose of this utility model is the deficiencies in the prior art part, provides a kind of automobile igniting circuit fault simple and reasonable, easy to install and use to detect the first aid device automatically.

To achieve the above object of the invention, technical solution main points of the present utility model are: between the input circlult and power switch circuit of existing automobile internal Motronic control maps firing circuit, be connected in series an ignition pulse signal testing circuit (to call testing circuit in the following text) and an igniting multipulse signal source circuit (to call signal source circuit in the following text) again, two circuit setting up also constitute parallel form with shaping circuit simultaneously.Comprise again in the testing circuit on the occasion of signal deteching circuit and negative value signal deteching circuit, and can be communicated with a working state display circuit (to call display circuit in the following text).When the Motronic control maps firing circuit broke down, the pulse signal of input circlult can be discontinuous shape.At this moment, testing circuit will judge according to failure condition rapidly, and automatically activated signal source circuit immediately, make it to produce the high-speed pulse fire signal, the primary current of the timely switch ignition coil of supply power switching circuit, and then in secondary winding, produce high pressure, to keep the running of motor.Meanwhile, display circuit work shows by tutorial light, and prompting driver motor has entered the rescue service state.Above-mentioned conversion of operation state is all carried out under not shutdown of motor situation, need not to operate manually, so just provides convenience for the smooth safe driving of automobile driver.

Below with reference to accompanying drawing the utility model is further described.

Fig. 1 is working principle of the present utility model (frame) figure.

Fig. 2 is the circuit connection diagram of a specific embodiment of the utility model.

Fig. 3 is the circuit connection diagram of working state display circuit.

As shown in the figure, testing circuit passes through K switch ₁With diode D ₁Link to each other with input circlult, it comprise in parallel insert on the occasion of signal deteching circuit and negative value signal deteching circuit.On the occasion of signal deteching circuit by interpolar coupling amplifier BG ₁, BG ₂, CM556 time base circuit IC ₁9～16 pin and transistor BG ₅, capacitor C ₁, C ₂, resistance R ₁～R ₄, potentiometer W ₁, diode D ₂Deng composition.Interpolar coupling amplifier BG ₁, BG ₂Be NPN-PNP type pipe direct-coupled circuit, it and capacitor C ₁Parallel connection, its output terminal insert CM556 time base circuit IC ₁14(15) pin, IC ₁The 10th pin access transistor BG ₅Base stage.The negative value signal deteching circuit is by voltage-stabiliser tube WD ₁, interpolar coupling amplifier BG ₃, BG ₄, CM556 time base circuit IC ₁1～8 pin and transistor BG ₆, capacitor C ₃, C ₄, resistor R ₅～R ₈, potentiometer W ₂, diode D ₃Deng composition.Interpolar coupling amplifier BG ₃, BG ₄Be two germanium tube positive-negative-positive pipe direct-coupled circuits, it and capacitor C ₃Parallel connection, its output terminal insert CM556 time base circuit IC ₁2(1) pin, IC ₁The 6th pin access transistor BG ₆Base stage.Transistor BG in the positive and negative value signal testing circuit ₅And BG ₆Output terminal (emitter) insert signal source circuit simultaneously.In testing circuit, CM556 time base circuit IC ₁Constitute two groups of independently monostable circuits, the positive and negative threshold voltage to ignition pulse signal detects respectively.Ignition pulse signal is continuous just often, its pulsed voltage on the occasion of signal through D ₁, R ₁Be input to BG ₁IC is constantly triggered in anti-phase amplification back ₁A monostable circuit, pass through simultaneously BG again ₂Buffer compartment from after constantly make time capacitor C ₁Discharge, its pulsed voltage negative value signal is then through D ₁, WD ₁Be input to BG ₃IC is constantly triggered in anti-phase amplification back ₁Another monostable circuit, pass through simultaneously BG again ₄Buffer compartment from after constantly make time capacitor C ₄Discharge.At this, we only consider the situation on the occasion of signal, import the appearance of ignition pulse voltage on the occasion of signal each time, all make IC ₁Be in the initial state of monostable timing, also make capacitor C before signal arrives next time ₁On voltage can not rise to the 2Vcc/3 of supply voltage because of charging, so under the normal ignition situation, IC ₁The 10th pin output be high level all the time, BG ₅Not conducting.In case electronic igniting circuit certain voltage that has lacked several input ignition pulse signals on the occasion of signal fault occurs on the occasion of, C ₁Duration of charge lengthening, cause its voltage to rise to more than the supply voltage 2Vcc/3, so just make IC ₁The 10th pin output low level, BG ₅Conducting, the output high level, the work of actuating signal source circuit makes it to export the multiple pulse fire signal, to keep engine running, exports the signal of non-normal working simultaneously to display circuit.The detection of ignition pulse voltage negative value signal and emergency situations and identical on the occasion of RST are not stated in this omission.

Signal source circuit is by CM555 time base circuit IC ₂, resistance R ₉～R ₁₂, capacitor C ₅, C ₆With diode D ₅Deng composition, with the transistor BG in the testing circuit ₅And BG ₆Output terminal insert IC simultaneously ₂The 2nd, 6,7,8 pin, and IC ₂The 3rd pin as the output terminal of signal source circuit, then by diode D ₅The access power switching circuit.When ignition pulse signal just often, transistor BG ₅And BG ₆End, because IC ₂The 4th pin pass through R ₁₁Ground connection makes IC ₂Failure of oscillation and not working, the pulse igniting signal of input circlult output directly is delivered to power switch circuit after shaping, make spark coil work.When the pulse igniting signal is improper, BG ₅Or BG ₆Conducting, the output high level is to IC ₂The 4th pin, at R ₁₁Last generation pressure drop makes IC ₂The 4th pin get high level, IC ₂Work produces the multi-harmonic-oscillations pulse signal, through R ₁₂, D ₅Be defeated by power switch circuit, and then the control ignition coil working.

What Fig. 3 provided is the circuit theory diagrams of display circuit.When pulse igniting signal proper functioning, supply voltage is defeated by BG through the A end ₈, the output positive voltage is through R ₁₈Make dichromatic LED E ₃Send a kind of photochromic (as green glow), the expression firing circuit is operated in normal state, and this moment is not because C, D end all obtains malleation, light emitting diode E ₁, E ₂All not luminous.When pulsed voltage when signal breaks down, BG ₅The output high level is held to C, makes light emitting diode E ₂Work makes BG simultaneously ₇Conducting, BG ₈End dichromatic LED E ₃Send another kind of photochromic (as ruddiness), the expression firing circuit is operated in improper on the occasion of signal first aid state; And when the negative value signal of pulsed voltage breaks down, BG ₆The output high level is held to D, makes light emitting diode E ₁Work, working condition is not thereafter stated in this omission with identical on the occasion of RST.

In the utility model, when firing circuit is in running order, K switch ₁And K ₂Should be in closed state, be in off working state, when promptly keeping in repair, then must open K when stopping and work as firing circuit ₁And K ₂

The utility model is easy to use, and the user need not the former ignition system of automobile is done any change, can use as long as load onto this device.Except that the trouble signal to firing circuit detect with first aid, also have and make function that the engine cold car starts rapidly and the function that makes old motor reinforcement, fuel-economizing.

Claims

1, a kind of automatic detection first aid device that is used to handle automobile internal Motronic control maps firing circuit fault, comprise the ignition pulse signal input circlult, shaping circuit and the power switch circuit that are serially connected with between distributor triggering sensor and the spark coil, it is characterized in that between input circlult and power switch circuit, being serially connected with ignition pulse signal testing circuit and igniting multipulse signal source circuit.

2, automatic detection first aid device as claimed in claim 1 is characterized in that

(1) the ignition pulse signal testing circuit passes through K switch ₁With diode D ₁Link to each other with input circlult, it comprise in parallel insert on the occasion of signal deteching circuit and negative value signal deteching circuit, wherein

(1.1) on the occasion of signal deteching circuit by interpolar coupling amplifier BG ₁, BG ₂, CM556 time base circuit IC ₁9～16 pin and transistor BG ₅, capacitor C ₁, C ₂, resistance R ₁～R ₄, potentiometer W ₁, diode D ₂Deng composition,

(1.2) the negative value signal deteching circuit is by voltage-stabiliser tube WD ₁, interpolar coupling amplifier BG ₃, BG ₄, IC ₁1～8 pin and transistor BG ₆, capacitor C ₃, C ₄, resistance R ₅～R ₈, potentiometer W ₂, diode D ₃Deng composition;

(2) igniting multipulse signal source circuit is by CM555 time base circuit IC ₂, resistance R ₉～R ₁₂, capacitor C ₅, C ₆With diode D ₅Deng composition.

3, automatic detection first aid device as claimed in claim 1 or 2 is characterized in that

(1) on the occasion of the interpolar coupling amplifier and the capacitor C of signal deteching circuit ₁Parallel connection, its output terminal inserts IC ₁14(15) pin, IC ₁The 10th pin access transistor BG ₅Base stage;

(2) the interpolar coupling amplifier of negative value signal deteching circuit and capacitor C ₂Parallel connection, its output terminal inserts IC ₁2(1) pin, IC ₁The 6th pin access transistor BG ₆Base stage;

(3) transistor BG ₅And BG ₆Output terminal insert IC simultaneously ₂The 2nd, 6,7,8 pin;

(4) IC ₂The 3rd pin by diode D ₅The access power switching circuit.