CN2337550Y

CN2337550Y - Computer diagnostic instrument for troubles of motorcycle

Info

Publication number: CN2337550Y
Application number: CN 98232870
Authority: CN
Inventors: 王一鹤; 熊学高
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-07-17
Filing date: 1998-07-17
Publication date: 1999-09-08
Anticipated expiration: 2008-07-17

Abstract

The utility model relates to a computer diagnostic instrument for faults of a motorcycle, which can realize the detection and the diagnose of a motorcycle which has faults. The utility model is characterized in that a detecting probe can be driven by an electronic circuit, dynamic non-contact and a no disassembly modes are adopted to accurately and rapidly diagnose the faults of a motorcycle. The utility model comprises a digital display voltage meter, a digital display circuit, a timing circuit connected with the input end of the digital display circuit. The utility model has the advantages of reasonable structure, high automation of detection, convenient fault diagnosis, accuracy, simple operation, etc. The utility model is widely used for fault detection anddiagnosis of various gasoline engines of motorcycles. The utility model can be also used for the fault diagnosis of various vehicles and equipment which adopt gasoline engines as motive power.

Description

Motorcycle fault computer diagnostic instrument

The utility model relates to and a kind of the motorcycle fault is detected, diagnoses the instrument of usefulness, particularly a kind ofly drives by electronic circuit that detection probe is come accurately, the motorcycle fault computer diagnostic instrument of quick diagnosis fault.

In existing technical scheme, the fault judgement of motorcycle mainly is by organs such as maintainer's eye, nose, ears, smells, listens, tries, perhaps adopt simple testing tool, determine trouble location by certain test, and for the fault of hiding, then must determine by the disintegration vehicle.Its shortcoming is that the randomness that differs of the experience because of maintenance person is very big, and ubiquity defectives such as maintenance speed is slow, fault judgement is inaccurate, even produces in bad repair, mistake and repair or repair again phenomenon.

The purpose of this utility model is to overcome the shortcoming of above-mentioned prior art, drives detection probe, adopts dynamic noncontact, does not disintegrate and come motorcycle fault computer diagnostic instrument accurate, the quick diagnosis fault by electronic circuit and provide a kind of.

The solution that realizes the utility model purpose is: the motorcycle fault computer diagnostic instrument that is provided, comprise a digital display voltage table (3), a digital display circuit (4) and a timing circuit that links to each other with its input end (5), described digital display voltage table (3) can be XL5135 type universal digital table, described digital display circuit (4) can be made of digital integrated block and charactron, described timing circuit (5) can be by timing button, integrated package and associated electronic components are formed, its special character is: the input end of described digital display voltage table (3) is connected with low pressure respectively, storage battery, cylinder is pressed and fuel oil test circuit (1), high-tension ignition test circuit (7) and abnormal sound test circuit (8), the input end of described digital display circuit (4) is connected with timing respectively, cutoff and rotating speed, igniting number test circuit (2), timing circuit (5) and high-tension ignition test circuit (7), its output terminal is connected to a myriabit display circuit (6), the output terminal of described timing circuit (5) also with described timing, broken end and rotating speed, igniting number test circuit (2) links to each other.

Myriabit display circuit of the present utility model (6) can be by myriabit pilot lamp, integrated package and resistance through being electrically connected to form.

Low pressure of the present utility model, storage battery, cylinder are pressed and fuel oil test circuit (1), mainly comprise the low voltage experiment circuit and the storage battery test circuit that are electrically connected to form by test pen, switch and electronic component, the fuel oil test circuit that the cylinder that is electrically connected to form by pressure transducer, integrated package, triode and electronic component is pressed test circuit and is electrically connected to form by gas sensor Q and associated electronic components.

Test circuit (2) is counted in timing of the present utility model, cutoff and rotating speed, igniting, mainly comprises the timing test circuit that is electrically connected to form by elements such as triode, transformer, neon lamps and cutoff test circuit and the measurement of rotating speed circuit and the igniting number test circuit that are electrically connected to form by elements such as inductive coil, integrated package, triodes.

High-tension ignition test circuit of the present utility model (7) mainly is electrically connected institute by inductive coil, integrated package and associated electronic components and constitutes.

Abnormal sound test circuit of the present utility model (8) mainly is electrically connected institute by electret microphone, integrated package and associated electronic components and constitutes.

Accompanying drawing has been described a preferred embodiment of the present utility model.

Fig. 1 is a theory diagram of the present utility model.

Fig. 2 is the circuit theory diagrams of the utility model embodiment.

Below in conjunction with accompanying drawing content of the present utility model is described in detail.

Know that referring to Fig. 1, Fig. 2 low pressure described in the utility model, storage battery, cylinder are pressed and fuel oil examination circuit (1) comprises by test pen E ₊/ E _-, K switch, resistance R 25, capacitor C ₁₉, diode D ₅Be electrically connected the low voltage experiment circuit of composition successively Deng element, by test pen E ₊/ E _-, diode D ₆, D ₇And resistance R ₂₆Be electrically connected the storage battery test circuit of forming, by pressure transducer P, ic chip ₁, triode T ₃, resistance R ₁₅With diode D ₃The cylinder of be electrically connected forming is pressed test circuit and by gas sensor Q, diode D ₈, D ₉, D ₁, triode T ₂With potentiometer W ₁, W ₂The fuel oil test circuit of be electrically connected forming, described low voltage experiment circuit, when K switch is dialled to oa-o ' a ' position, test pen E then ₊With resistance R ₂₅Upper end, diode D ₅And C ₁₉Anodal continuous, R ₂₅Lower end and C ₁₉Behind the minus earth with test pen E _-Link to each other D ₅Negative pole links to each other with the input pin 7 of digital display voltage table M, because R ₂₅And C ₁₉Transient state maintenance effect, can pass through test pen E ₊/ E _-AC and DC voltage to each position of motorcycle electric appliance system is measured, to diagnose its trouble spot; Described storage battery test circuit, when K switch is dialled to ob-o ' b ' position, test pen E then ₊With diode D ₇Negative pole link to each other, D ₇Positive pole and positive source V _CcLink to each other E _-With resistance R ₂₆With diode D ₆Anodal tie point links to each other, R ₂₆The other end link to each other D with ground ₆Negative pole link to each other with the input pin 7 of digital display voltage table M because D ₇Exportable unidirectional DC charging voltage, R ₂₆Be pull-up resistor, so pass through D ₇, R ₂₆To the charging of tested storage battery, its charging current through R ₂₆Produce pressure drop and by D ₆Export digital display voltage table M to, diagnose storage battery whether to damage to the greatest extent; Described cylinder is pressed test circuit, an end and the IC of pressure transducer P ₁In-phase end pin 2 link to each other, the other end and IC ₁The equal ground connection of 3,4 pin, IC ₁Pin 6 and positive source V _CcContinuous, its pin 5 and triode T ₃Base stage links to each other, T ₃Emitter-collector through resistance in series R ₁₅Back cross-over connection between the power supply positive and negative electrode, diode D ₃Positive pole is connected to T ₃Collector, its negative pole link to each other with the input pin 7 of digital display voltage table M, pressure transducer P with institute survey the engine cylinder-body pressure signal become electric signal, through high-gain amplifier IC ₁Amplification also is coupled to T ₃After carrying out voltage amplification and paraphase, at pull-up resistor R ₁₅Last generation pressure drop is through D ₃Export digital display voltage M to and can demonstrate the cylinder pressure of surveying; Described fuel oil test circuit, pin 1, the pin 2 of gas-sensing probe Q link to each other diode D respectively with the power supply positive and negative electrode ₈And D ₉Forward series connection and cross-over connection are in positive source V _CcAnd between the pin 6 of Q, triode T ₂Collector through series connection potentiometer W ₁The back and the emitter cross-over connection between the power supply positive and negative electrode, W ₁Adjustable end and the input pin 7 of M between forward be connected to diode D ₁, Q pin 7 and T ₂The emitter span is connected to potentiometer W ₂, W ₂Adjustable end then with T ₂Base stage links to each other, when running into inflammable gas because of gas-sensing probe Q, its resistance can sharply descend, so at Q → W ₂W in the → ground circuit ₂T is given in last generation pressure drop ₂A voltage signal is provided, through T ₂Amplify the back at W ₁Last generation pressure drop and through adjustable end by D ₁Export digital display voltage table M to and indicate the fuel oil concentration of surveying.Described timing, cutoff and rotating speed, igniting are counted test circuit (2) and are comprised by resistance R ₁₃, triode T ₅, the timing test circuit formed of transformer B and neon lamp N and cutoff test circuit and by inductive coil L ₂, capacitor C ₂-C ₄, C ₁₁, C ₁₄Resistance R ₁-R ₄, R ₉, ic chip ₄With triode T ₄Measurement of rotating speed circuit of forming and igniting number test circuit, described timing test circuit, resistance R ₁₃Left end and IC ₄Output pin 3 and C ₁₄Link to each other, its right-hand member and T ₅Base stage links to each other, T ₅The collector string have behind the elementary winding of transformer B and the emitter cross-over connection between the positive and negative electrode of power supply, the secondary winding two ends of B are connected with neon lamp N, from IC ₄The square-wave signal of pin 3 is through R ₁₃Import T after the current limliting ₃Amplify, rise to 180V and light neon lamp N by step-up transformer B, the light velocity of neon lamp N is shone between magnetic motor for motorcycle advanced ignition angle F point groove and engine case top dead centre T groove, change magneto generator stator angle F, T two grooves are coincided, can finish the adjustment of ignition timing fast; Described cutoff test circuit is identical with described timing test circuit, during testing and diagnosing, only need to observe a neon lamp N and have or not scintillation, as the no cutoff fault of flicker free explanation, then illustrate the cutoff fault is arranged (when being in idling if any flicker because of motorcycle, its drive shaft turns frequency only has about 20Hz, is fully aware of so detect by an unaided eye); Described measurement of rotating speed circuit, its inductive coil L ₂-end ground connection, the other end are through C ₂With T ₄Base stage links to each other, resistance R ₁Cross-over connection between base stage and ground, T ₄Grounded emitter, collector seal in resistance R ₂After meet positive source V _Cc, resistance R ₃, R ₄The cross-over connection of series connection back between the power supply positive and negative electrode, its serial connection point is connected with IC ₄Pin 2 and and T ₄The capacitor C that collector links to each other ₃, resistance R ₉With capacitor C ₄Stride after the anodal series connection press between the power supply positive and negative electrode, its series connection point and IC ₄Pin 6,7 link to each other IC ₄Pin 4,8 meet positive source V _Cc, pin 1 ground connection, pin 5 is through capacitor C ₁₁Also ground connection is worked as L ₂Sense high-voltage ignition signal through C ₂, R ₁Import T behind the differential ₄Amplify, export again through C by collector ₃, R ₄, R ₃Differential, output spike pulse signal triggering are in the monostable circuit IC that is output as low state ₄, IC ₄3 output of pin high level square-wave signal is through C ₁₄Carry out step-by-step counting, and gate time by timing circuit (5) control figure display circuit (4) to digital display circuit (4), because of the engine crankshaft magneto generator that whenever circles is then exported a high-voltage ignition signal, clicked timing button AN ₁, can measure the number of pulse in the setting-up time, realize test to the greatest extent engine speed, and shown that by digital display circuit (4) or myriabit display circuit (6) hummer F is in order to the auditory tone cues of test period; Described timing circuit (5) comprises by ic chip ₁₀Pin 4,8 meets V _Cc, be connected to capacitor C between pin 1 ground connection, pin 5 and the ground ₁₂,

6,7 is connected to potentiometer W ₄With capacitor C ₁₃The contact that positive pole is in series, W ₄Another termination V _Cc, capacitor C ₁₃Other end ground connection, resistance R ₁₀With capacitor C ₁₄The cross-over connection of series connection back between the power supply positive and negative electrode, its serial connection point and IC ₁₀Pin 2 links to each other, and is connected to timing button AN between pin 2 and the ground ₁, IC ₁₀Output pin 3 respectively with ic chip ₉Pin 5, capacitor C ₁₆Positive pole, buzzer F, diode D ₁₀Negative pole all links to each other; Described digital display circuit (4) is by ic chip ₅-IC ₈, charactron LC ₁-LC ₄, reset button AN ₂, capacitor C ₁₅, C ₁₆, diode D ₁₀And resistance R ₃₀The four figures display circuit that is electrically connected successively and constitutes; Described myriabit display circuit (6) is by ic chip ₉, resistance R and luminotron LED be electrically connected and the luminous display circuit that constitutes successively.When timing circuit (5) beginning timing, count pulse is by C ₁₄Input to IC ₅Pin 9, D ₁₀Negative pole is in high level, then counting beginning and demonstration is arranged; When timing arrives, D then ₁₀Negative pole be in low level, counter and stop to count and will counting the numeral of depositing demonstration and pin C ₁₅Effect be that the counting display circuit is in zero condition when guaranteeing start, push AN ₂Can deposit the display digit return-to-zero with counting once; Show when the survey rotating speed can pass through digital display circuit (4) during less than myriabit, such as the survey rotating speed exceed four and be upgraded to myriabit, IC then ₈Carry pulse export to by IC from its pin 10 ₉ Pin 1 in the bistable circuit that constitutes, make circuit upset, its pin 6 be high level and the luminous myriabit rotating speed that demonstrates of driving LED; It is identical with described measurement of rotating speed circuit that test circuit is counted in described igniting, and different is: inductive coil L ₂Need not to respond to high-voltage ignition signal, but gather a twinkling signal, be foot-actuated levers firmly step on, through L ₂Induction back the shown igniting number of digital display circuit (4) if any the number more than 5 show, explanation firing system non-fault, as be less than these several these systems that then illustrate fault arranged.Described high-tension ignition test circuit (7) comprises by inductive coil L ₁, ic chip ₂(A ₁+ A ₂), IC ₃, triode T ₁, resistance R ₅-R ₈, R ₁₀-R ₁₂, R ₁₇, R ₁₈, capacitor C ₁, C ₅-C ₉, Co and diode D ₂Deng element be electrically connected successively form L ₁One end ground connection, the other end are through capacitor C ₁Insert A ₁ Pin 5, A ₁ Pin 8 meets positive source V _Cc, pin 6 is through resistance R ₅Ground connection, 6,7 strings of pin have resistance R ₆, pin 7 is through capacitor C ₅Insert IC ₃Pin 2, resistance R ₇, R ₈Stride after the series connection press between the power supply positive and negative electrode, its serial connection point and IC ₃Pin 2 links to each other triode T ₁Emitter meets positive source V _Cc, collector series capacitance C ₆Positive pole is after C ₆Minus earth, its serial connection point and IC ₃Pin 6,7 links to each other IC ₃Pin 4,8 meets positive source V _Cc, pin 1 connects power cathode, pin 5 through capacitor C ₇Ground connection, pin 3 respectively with D ₂Left end and the A of positive pole, Co ₂Pin 3 links to each other, right-hand member and the IC of Co ₅Pin 9 links to each other resistance R ₁₀, R ₁₁The cross-over connection of series connection back between the power supply positive and negative electrode, its serial connection point is respectively through resistance R ₁₂Insert A ₂ Pin 2 and through capacitor C ₈Anodal and from minus earth, resistance R ₁₄One end and capacitor C ₉Positive pole inserts A altogether ₂ Pin 3, its other end and C ₉The equal ground connection of negative pole,

A

₂3,1 string of pin has resistance R ₁₇, its pin 1 respectively with T ₁Base stage and resistance R ₁₈Link to each other and through R ₁₈Insert positive source V _Cc, A ₁Be in-phase amplifier, as inductive coil L ₁Sense faint ignition signal by A ₁Amplify and through C ₅, R ₇, R ₈Trigger IC behind the differential ₃And output square wave, because A ₂And T ₁Collector current Ic is to C ₆Discharge and recharge and constitute dutycycle close-loop automatic adjustment circuit, so no matter the frequency change of input signal or mains voltage variations can both make dutycycle keep constant, from IC ₃The square-wave signal of pin 3 is through D ₂Input to digital display ammeter M pin 7 after the rectification and indicate the voltage of surveying, the size that institute's mensuration magneto generator produces the igniting high-pressure energy then shows through Co input digit display circuit (4), thereby realization is to the detection of igniting high pressure.Described abnormal sound test circuit (8) is mainly by integrated circuit (IC) ₁₁, IC ₁₂, electret microphone MC, diode D ₄, resistance R ₂₁-R ₂₃, capacitor C ₁₅-C ₁₈And capacitor W ₃Form resistance R ₂₁Connect the back cross-over connection between the power supply positive and negative electrode with microphone MC, and its serial connection point is through C ₁₅Be electrically connected the back and insert IC ₁₁Pin 2, IC ₁₁ Pin 6 meets positive source V _Cc,

3,4 ground connection, pin 5 are through C ₁₆Insert IC ₁₂Pin 1, IC ₁₂Be connected to resistance R between pin 1 and the ground ₂₂, pin 5 meets V _Cc, pin 6 and V _CcBetween be connected to resistance R ₂₃, pin 4 and D ₄Anodal link to each other, be parallel with capacitor C between pin 3 and the ground ₁₈And W ₃, be connected to capacitor C between pin 8 ground connection, pin 2 and the ground ₁₇, D ₄Negative pole links to each other with M pin 7, microphone MC with the abnormal sound signal that receives through C ₁₅Be coupled to IC ₁₁Amplify, again through C ₁₆Be coupled to IC ₁₂Pin 1 back compares in its comparer, when the output of comparer changes state, because of current impulse, the average current that is provided from its pin 3 be directly proportional with incoming frequency, so can obtain conversion characteristic between frequency/voltage, thereby discriminated union detects the abnormal sound frequency, diagnoses out guilty culprit because of the abnormal sound generation to the greatest extent.

Gas-sensing probe Q can adopt MQKT described in the utility model embodiment ₄Type; Pressure transducer P can adopt the CY-1B type; Ic chip ₁, IC ₁₁Can adopt LM386 series; IC ₂Can adopt LM358 series; IC ₃, IC ₄, IC ₁₂Can adopt 555 series; IC ₅, IC ₆, IC ₇, IC ₈Can adopt CC4011 series; IC ₉Can adopt 74LS00 series; IC ₁₀Can adopt LM2917 series; Charactron LC ₁, LC ₂, LC ₃, LC ₄Can adopt LC5022 series.

In conjunction with the foregoing description as can be seen, the utility model compared with prior art has following advantage:

1. rational in infrastructure, detect the automaticity height;

To the dynamic test of motorcycle adopt non-by touch, the mode of not disintegrating, tracing trouble accurately, quick;

3. reduce labour intensity and maintenance cost, improved detection rates, eradicated omission, flase drop or diagnostic error.

The utility model can be widely used in fault detect, the diagnosis of all kinds of petrol engine motorcycles, and also can be used for the petrol engine is the various types of vehicles of power and the fault diagnosis of equipment.

Claims

1. motorcycle fault computer diagnostic instrument, comprise a digital display voltage table (3), a digital display circuit (4) and a timing circuit that links to each other with its input end (5), described digital display voltage table (3) can be XL5135 type universal digital table, and described digital display circuit (4) can be by digital integrated block IC ₅-IC ₈With charactron LC ₁-LC ₄Constitute, described timing circuit (5) can be by timing button AN ₁, ic chip ₁₀And associated electronic components is electrically connected to form successively, it is characterized in that: the input end of described digital display voltage table (3) is connected with low pressure respectively, storage battery, cylinder is pressed and fuel oil test circuit (1), high-tension ignition test circuit (7) and abnormal sound test circuit (8), the input end of described digital display circuit (4) is connected with timing respectively, cutoff and rotating speed, igniting number test circuit (2), timing circuit (5) and high-tension ignition test circuit (7), its output terminal is connected to a myriabit display circuit (6), the output terminal of described timing circuit (5) also with described timing, cutoff and rotating speed, igniting number test circuit (2) links to each other.

2. motorcycle fault computer diagnostic instrument as claimed in claim 1 is characterized in that: described low pressure, storage battery, cylinder are pressed and fuel oil test circuit (1) comprises by K switch, test pen E ₊With resistance R ₂₅Upper end, diode D ₅Positive pole and capacitor C ₁₉Anodal continuous, R ₂₅Lower end and C ₁₉Behind the minus earth with test pen E _-Link to each other D ₅The low voltage experiment circuit that negative pole and the input pin 7 of digital display voltage table M link to each other and constituted; By K switch, test pen E ₊With diode D ₇Negative pole link to each other D ₇Positive pole and positive source V _CcLink to each other test pen E _-With resistance R ₂₆With diode D ₆Anodal tie point links to each other, R ₂₆The other end link to each other D with ground ₆The storage battery test circuit that negative pole and the input pin 7 of digital display voltage table M link to each other and constituted; An end and ic chip by pressure transducer P ₁In-phase end pin 2 link to each other, the other end and ic chip ₁Pin 3,4 equal ground connection, IC ₁Pin 6 and positive source V _CcContinuous, its pin 5 and triode T ₃Base stage links to each other, T ₃Emitter one collector through resistance in series R ₁₅Back cross-over connection between the power supply positive and negative electrode, diode D ₃Positive pole is connected to T ₃Collector, its negative pole link to each other with the input pin 7 of digital display voltage table M the cylinder that constituted press test circuit and by pin 1, the pin 2 of gas-sensing probe Q link to each other with the power supply positive and negative electrode respectively, diode D ₈And D ₉Forward series connection and cross-over connection are in positive source V _CcAnd between the pin 6 of Q, triode T ₂Collector through series connection potentiometer W ₁The back and the emitter cross-over connection between the power supply positive and negative electrode, W ₁Adjustable end and diode D ₁Positive pole connects the back, links to each other pin 7 and the T of Q through negative pole with the input pin 7 of M ₂Be in series with potentiometer W between the emitter ₂, W ₂Adjustable end and T ₂The fuel oil test circuit that base stage links to each other and constituted.

3. motorcycle fault computer diagnostic instrument as claimed in claim 1 is characterized in that: described high-tension ignition test circuit (7) comprises by inductive coil L ₁One end ground connection, the other end are through capacitor C ₁Insert A ₁(IC ₂1/2) pin 5, A ₁Pin 8 meets positive source V _Cc, pin 6 is through resistance R ₅Ground connection, 6,7 strings of pin have resistance R ₆, pin 7 is through capacitor C ₅Be connected to ic chip ₃Pin 2, resistance R ₇, R ₈Stride after the series connection press between the power supply positive and negative electrode, its serial connection point and IC ₃Pin 2 links to each other triode T ₁Emitter meets positive source V _Cc, collector series capacitance C ₆Positive pole is after C ₆Minus earth, its serial connection point and IC ₃Pin 6,7 links to each other IC ₃Pin 4,8 meets positive source V _Cc, pin 1 connects power cathode, pin 5 through capacitor C ₇Ground connection, pin 3 respectively with D ₂Left end and the A of positive pole, Co ₂(IC ₂1/2) pin 3 links to each other, right-hand member and the IC of Co ₅Pin 9 links to each other resistance R ₁₀, R ₁₁Stride after the serial connection press between the power supply positive and negative electrode, its serial connection point is respectively through resistance R ₁₂Insert A ₂Pin 2 and through capacitor C ₈Anodal and from minus earth, resistance R ₁₄One end and capacitor C ₉The anodal A that inserts ₂Pin 3, its other end and C ₉The equal ground connection of negative pole, A ₂3,1 string of pin has resistance R ₁₇, its pin 1 respectively with T ₁Base stage and resistance R ₁₈Link to each other and through R ₁₈Insert positive source V _CcConstitute.

4. as claim 1 or 2 or 3 described motorcycle fault computer diagnostic instruments, it is characterized in that: described abnormal sound test circuit (8) comprises by resistance R ₂₁Connect with microphone MC the back cross-over connection between the power supply positive and negative electrode, its serial connection point is through capacitor C ₁₅Be electrically connected the back and insert ic chip ₁₁Pin 2, IC ₁₁Pin 6 meets positive source V _Cc, pin 3,4 ground connection, pin 5 are through C ₁₆Insert ic chip ₁₂Pin 1, IC ₁₂Be connected to resistance R between pin 1 and the ground ₂₂, pin 5 meets V _Cc, pin 6 and V _CcBetween be connected to resistance R ₂₃, pin 4 and diode D ₄Anodal continuous, D ₄Negative pole links to each other with digital display voltage gauge pressure M pin 7, be parallel with capacitor C between pin 3 and the ground ₁₈And W ₃, be connected to capacitor C between pin 8 ground connection, pin 2 and the ground ₁₇Constitute.

5. motorcycle fault computer diagnostic instrument as claimed in claim 4 is characterized in that: described timing, cutoff and rotating speed, igniting are counted test circuit (2) and are comprised by resistance R ₁₃Left end and ic chip ₄Output pin 3 and capacitor C ₁₄Link to each other, its right-hand member and triode T ₅Base stage links to each other, T ₅The collector string have behind the elementary winding of transformer B and the emitter cross-over connection between the power supply positive and negative electrode, the inferior utmost point winding two ends of B are connected with timing test circuit and the cutoff test circuit that neon lamp N is constituted; By inductive coil L ₂One end ground connection, the other end are through capacitor C ₂With triode T ₄Base stage links to each other, resistance R ₁Cross-over connection is in T ₄Between base stage and the ground, T ₄Grounded emitter, collector seal in resistance R ₂After meet positive source V _Cc, resistance R ₃, R ₄The cross-over connection of series connection back between the power supply positive and negative electrode, its serial connection point is connected with ic chip ₄Pin 2 and and T ₄The capacitor C that collector links to each other ₃, resistance R ₉With capacitor C ₄Anodal series connection back cross-over connection between the power supply positive and negative electrode, its serial connection point and IC ₄Pin 6,7 link to each other IC ₄Pin 4,8 meet positive source V _Cc, pin 1 ground connection, pin 5 is through capacitor C ₁₁Revolution test circuit that also ground connection constituted and igniting number test circuit.

6. motorcycle fault computer diagnostic instrument as claimed in claim 4 is characterized in that: described myriabit display circuit (6) comprises by ic chip ₉Pin 3 link to each other with pin 4, pin 2 links to each other with pin 6, pin 1 and ic chip ₈Pin 10 links to each other, pin 5 respectively with IC ₁₀Pin 3, hummer F, D ₁₀Negative pole and C ₁₆Positive pole links to each other, pin 2,6 tie points link to each other with resistance R one end, the R other end links to each other with luminotron LED positive pole, the IED minus earth constitutes.