CN2165245Y - Contactless electronic distributor ignition system - Google Patents

Abstract

The utility model relates to a contactless electronic distributor ignition system for a gasoline engine, which is composed of an electronic ignition circuit and a contactless electricity distributor. Compared with other kinds of electric igniter, the utility model is characterized in that all electrical contacts in an engine ignition circuit are completely canceled; the electronic ignition circuit adopts a double-head ignition coil which can make two spark plugs discharge to ignite in the meantime. When the circuit of the utility model is used independently, the utility model can be used for a two-cylinder gasoline engine; when two sets of circuits are matched to use, the utility model can be used for a four-cylinder gasoline engine; when three sets of circuits are matched to be used, the utility model can be used for six-cylinder gasoline engine.

Description

Contactless electronic distributor ignition system

The utility model is applicable to that the petrol engine of one or more pairs of cylinders uses, as the petrol engine of two cylinders, four cylinders, six cylinders.Be characterized in to fully phase out all electrical pickofves in the engine igniting circuit, as contact breaker points and split fire head high-voltage contact.

At present, the automotive electronic igniter of the many producers of China development and production has transistor switch formula igniter and transistor capacitance discharge type igniter two big classes by its working principle classification, wherein uses more with transistor capacitance discharge type igniter.Above-mentioned two kinds of ignitions are still by the contact breaker points control ignition, contact breaker points is by the control electric current of ignition, though eliminated the spark of contact breaker points, solved the ablation problem of contact, but the voltage at two ends, contact is very low, the electric current that flows through the contact is very weak, if contact breaker points is subjected to the light contamination of greasy dirt or dust, will cause the igniter cisco unity malfunction.Each cylinder ignition order still divides by the original contact distributor that has simultaneously, not eliminating the high pressure split fire head ablates, the distributor cap high pressure is scurried fire, the vacuum advance angle of the wearing and tearing of breaker-point bracket and contact breaker points and the mismatch error problem of split fire head centrifugal advance angle.

The purpose of this utility model is the shortcoming that overcomes above-mentioned ignition, and all electrical pickofves in the cancellation engine igniting circuit are as contact breaker points and split fire head high-voltage contact.And design a kind of contactless electron branch electric ignition system.

The utility model is a kind of contactless electron branch electric ignition system, is applicable to two cylinders, four cylinders, six cylinder gasoline engines.It is characterized in that forming by 1 to 3 electronic igniting circuit and breakerless distributor.

Referring to accompanying drawing the utility model is described in detail:

Fig. 1 is an electrical schematic of the present utility model.

Fig. 2 is the plotted curve of corresponding sensor pulsed voltage U of the ignition location figure of split fire head under the different rotating speeds.

Fig. 3 is the electrical schematic that is used for the four cylinder engine circuit.

Fig. 4 is the electrical schematic that is used for the six cylinder engine circuit.

Accompanying drawing 1 frame of broken lines 1. part is a firing circuit, firing circuit is by NE555 circuit and resistance R 1, R2, R3, capacitor C 1 is formed multi-vibrator, the 3 pin output rectangular pulse of N555, through resistance R 4 de-excitation transistor Ts 2 base stages, by power tube T2, transformer B1 constitutes single tube inverse-excitation type DC booster converter, by diode D2, D3, D4, controllable silicon SCR, capacitor C 3, resistance R 8 double end spark coil B2 constitute the capacitive discharge ignition circuit, by transistor T 1, resistance R 5, R6, R7,5 pin of voltage-stabiliser tube D1 and NE555 are connected into the closed-loop path, when 5 pin of NE555 through transistor T 1 resistance R 5 over the ground during conducting, the output frequency of may command NE5553 pin, frame of broken lines 2. part is a breakerless distributor, and breakerless distributor is made up of non contact pick up L1 and contactless split fire head D.Non contact pick up L1 is fixed in the distribution box, and contactless split fire head is installed two blocks of magnet of a, b respectively on two point of contacts of its diameter, be installed on the distributor shaft.When contactless split fire head rotated a circle, each process non contact pick up L1 of magnet a, b once can make non contact pick up L1 produce two pulses, and magnet a, b and non contact pick up matching gap are 1～2mm.

When accompanying drawing 1 uses separately, can be used for two cylinder gasoline engines, motor as 750 type side cars, this motor is the flat opposed twin-tub, and the velocity ratio of engine spindle and distributor shaft is that 2:1 is that engine spindle rotated for two weeks, and distributor shaft rotates a circle, the utility model accompanying drawing 1 1. the part in, the capacitive discharge ignition circuit adopts the double end spark coil, can make two spark plugs discharge igniting simultaneously, the igniting of may command two cylinder gasoline engines.When motor will start, circuit is switched on power supply, start working by the multi-vibrator that the NE555 circuit is formed, 3 pin output rectangular pulse is through the base stage of resistance R 4 driver transistor T2, transistor T 2 and transformer B1 form the inverse-excitation type DC booster converter and enter working state, ac square wave about the inferior utmost point winding output 400V of transformer B1 charges to capacitor C3 through diode D2 rectification.When motor also is not activated operation, the capacitor C3 duration of charge is long, during overtension, through resistance R 6, the R7 dividing potential drop, VR7 makes transistor T 1 conducting by voltage-stabiliser tube D1, NE555 circuit 5 pin are through resistance R 4 conducting over the ground, thereby the pulse output of control NE555 3 pin, transistor T 2 is temporarily ended, oscillation transformer B1 suspends to capacitor C 3 chargings, damage thereby VC3 is stabilized in prevent between 400～500V because of the VC3 overtension makes component breakdown, when the VR7 undertension during with conducting voltage-stabiliser tube D1 transistor T 1 end, NE555 circuit 5 pin are equivalent to unsettled, transistor T 2 is started working, and continues to charge to capacitor C3.During engine start, contactless split fire head has the motivation rotation with sending out, as magnet a on the split fire head during near non contact pick up L1, produce firing pulse among the sensor L1, trigger controllable silicon SCR conducting in the capacitive discharge ignition circuit through diode D3 and resistance R 8, capacitor C 3 through controllable silicon SCR rapidly to the elementary discharge of double end spark coil B2, in secondary winding, induce several ten thousand volt high pressure, make two spark plugs on the motor emit electrical spark simultaneously, make to be in compression stroke top dead center 1 cylinder igniting outburst, this moment, motor 2 cylinders were in the exhaust stroke top dead center, and pressing chamber is full of the waste gas of not emptying, therefore 2 cylinder spark plug discharge ignitings are inoperative, 2 cylinders are in compression stroke top dead center during 360 ° of engine revolution, split fire head Rotate 180 °, and magnet b is near non contact pick up L1, produce firing pulse among the sensor L1, controllable silicon SCR is conducting once more, capacitor C 3 discharges, spark plug while discharge igniting on two cylinders, 2 cylinder spark plugs are finished the igniting to 2 cylinders, and the igniting of 1 cylinder is invalid.For satisfying the requirement of petrol engine to ignition advance angle, ignition advance angle increases with the rising of engine speed, when engine crankshaft runs to ignition location, and the triggering and conducting controllable silicon SCR that the pulse induction voltage that non contact pick up produces should be in good time.Rising with engine speed n, the pulsed voltage U that non contact pick up produces raises, the Pulse wave of controllable silicon trigger voltage Ug broadens, controllable silicon shifts to an earlier date triggering and conducting, capacitor discharge carries out in advance, ignition advance angle θ increases, and has adapted to the different requirements of engine speed change to ignition advance angle to a certain extent automatically.The relation of ignition advance angle θ, non contact pick up pulse voltage of reaction U, controllable silicon trigger voltage Ug and engine speed n as shown in Figure 2, the left side is the ignition location figure of contactless split fire head when different rotating speeds among the figure, and right part of flg is the plotted curve of corresponding non contact pick up pulsed voltage U.Be engine speed n1=400r/min partly 1. among the figure, corresponding advance angle is 2. partly to be engine speed n2=2000r/min among θ 1 figure, and corresponding advance angle is θ 2, is engine speed n3=4000r/min partly 3. among the figure, and corresponding advance angle is θ 3.Because ignition advance angle changes with the variation of different model engine speed range, so the ignition advance angle of ignition system nominal can provide according to motor regulation rotating speed.

When two cover circuit of the present utility model are used, applicable to four-cylinder gasoline engine, as shown in Figure 3.Fig. 3 is made up of two parts.2. be No. 1 No. 2 two firing circuits partly 1. among Fig. 3, be the breakerless distributor part partly among Fig. 3.1. the firing circuit composition of part is identical in the composition of No. 1 No. 2 firing circuit parts and the utility model accompanying drawing 1 among Fig. 3.Among Fig. 3 2. part breakerless distributor part form by contactless split fire head and two non contact pick up L1, L2, two magnet a, b space are 180 ° on the contactless split fire head, 90 ° of spaces, two non contact pick up mounting points, the matching gap of magnet a, b and two non contact pick ups is 1～2mm on the contactless split fire head.

3 working principles are described in conjunction with the accompanying drawings: four-cylinder gasoline engine cylinder work ignition order is 1243, and engine spindle and distributor shaft rotating ratio are 1:1.Among Fig. 3 1. No. 1 firing circuit of part control the plug ignition of 1 cylinder and 4 cylinders, No. 2 firing circuits are controlled the plug ignition of 2 cylinders and 3 cylinders, 2. No. 1 firing circuit work of the control of the non contact pick up L1 in Bu Fen the breakerless distributor, non contact pick up L2 controls No. 2 firing circuit work, and contactless split fire head is rotated counterclockwise with motor.When 1 cylinder or 4 cylinders were in the ignition timing position, magnet a or b on the contactless split fire head should align non contact pick up L1.When engine start, contactless split fire head is with engine revolution, as magnet a during near non contact pick up L1, produce inductive impulse among the L1, controllable silicon SCR triggering and conducting in No. 1 firing circuit, the spark plug of 1 cylinder and 4 cylinders produces electrical spark simultaneously, makes the 1 cylinder igniting outburst that is in compression stroke top dead center, 4 cylinders are in the exhaust stroke top dead center, and plug ignition is invalid.Split fire head is during with 90 ° of engine revolution, magnet a proximity detector L2, produce inductive impulse among the L2, control controllable silicon SCR conducting in No. 2 firing circuits, the spark plug of 2 cylinders and 3 cylinders is emitted electrical spark simultaneously, make the 2 cylinders igniting outburst that is in compression stroke top dead center, 3 cylinders are in the exhaust stroke top dead center, and plug ignition is invalid.Contactless split fire head is during with 180 ° of engine revolution, magnet b proximity detector L1, produce inductive impulse among the L1, control controllable silicon SCR conducting once more in No. 1 firing circuit, the spark plug of 1 cylinder and 4 cylinders is discharge igniting simultaneously, and at this moment, 4 cylinders are in compression stroke top dead center, 4 cylinders igniting outburst, the igniting of 1 cylinder is invalid.When contactless split fire head rotated 270 °, magnet b proximity detector L2 produced inductive impulse among the L2, control controllable silicon SCR conducting in No. 2 firing circuits, the spark plug of 2 cylinders and 3 cylinders is discharge igniting simultaneously, makes the 3 cylinders igniting outburst that is in compression stroke top dead center, and 2 cylinder plug ignitions are invalid.Split fire head is during with 360 ° of engine revolution, the outburst of lighting a fire once more of 1 cylinder, four cylinders of motor under the control of breakerless distributor by 1243 igniting, sequential loop work.The motor advance angle is by the automatic advance angle control of the centrifugal governor and the breakerless distributor of electricity-distributing axis lower end, and the advance angle number of degrees are the automatic number of degrees in advance that the number of degrees in advance of centrifugal governor add breakerless distributor.

When the utility model is used for six cylinder gasoline engines, need 3 cover accompanying drawings, 1 circuit is used, as shown in Figure 4: among the figure 1. part form by 3 cover firing circuits, 2. part breakerless distributor among the figure is made up of L1, L2, three non contact pick ups of L3 and contactless split fire head.The mounting point of 3 non contact pick ups, the space is 60 ° between L1, the L2, and the space is 60 ° between L2, the L3,180 ° of two magnet a on the contactless split fire head, b spaces.The matching gap of magnet and 3 non contact pick ups is 1～2mm, and split fire head is 1:1 with the engine revolution rotating ratio, and the ignition order of six cylinder engine is 153624.The working principle of breakerless distributor is: non contact pick up L1 is under the effect of contactless split fire head, control the plug ignition of 1 cylinder and 6 cylinders, non contact pick up L2 is under the effect of contactless split fire head, control the plug ignition of 5 cylinders and 2 cylinders, non contact pick up L3 controls the plug ignition of 3 cylinders and 4 cylinders under the effect of contactless split fire head.Working principle divides the electric igniter working principle identical with the electronics of four cylinder engine.

Claims (3)

1, a kind of contactless electron divides electric ignition system, is applicable to two cylinders, four cylinders, six cylinder gasoline engines, it is characterized in that being made up of 1 to 3 electronic igniting circuit and breakerless distributor.

2, contactless electron according to claim 1 divides electric ignition system, it is characterized in that, breakerless distributor is made up of contactless split fire head D and non contact pick up L1 to L3.

3, contactless electron according to claim 1 divides electric ignition system, it is characterized in that, electronic igniting circuit is mainly by integrated circuit oscillator, and DC booster converter, capacitor discharging circuit and double end spark coil B2 form.

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