CN1037990C - Multiple-point synchronous igniter for gasoline engine - Google Patents

Abstract

The present invention discloses a multipoint synchronous igniter for a gasoline engine, which relates to an igniter for the gasoline engine. The present invention is composed of an ignition coil comprising a plurality of high voltage coils, a multipoint distributor block and a multipoint sparking plug, high voltage currents generated by the high voltage coils respectively flow into a plurality of central electrodes of a multipoint sparking plug of an engine cylinder by the multipoint distributor block, a plurality of high voltage electric sparks are simultaneously generated among each pair of the central electrodes and side electrodes, and thus, a mixed gas in a corresponding cylinder is ignited. The present invention has the advantages of high electric spark energy, large initial flame cores and strong ignition reliability, and an engine is easy to ignite and start at low temperature. Thus, the present invention can widely serve as igniters of various gasoline engines.

Description

Multiple-point synchronous igniter for gasoline engine

The present invention relates to a kind of ignition device of gasoline engine.

Ignition mechanism is petrolic important component part, and it utilizes high-voltage spark that the mixed gas in the engine cylinder is lighted, and the mixed gas burning expansion also promotes bent axle by cylinder piston and rotates.Ignition device of gasoline engine mainly comprises spark coil, distributor and spark plug three big parts.Spark coil is the device that produces high-tension current, is mainly formed and be wound in respectively the former limit and the secondary of same transformer by low voltage winding and high-tension coil.Spark plug is to produce the device of high-voltage spark with mixed gas in the gas cylinder in cylinder, its number equates with the cylinder number, its chief component is the centre electrode and the other utmost point of corresponding ground connection that is used to produce high-voltage spark, is installed in cylinder by a steel sleeve and covers and make the centre electrode and the other utmost point to stretch into the cylinder inner top.Distributor mainly is made of fire seperating core and switchboard, have the electric sheet that holds that equates with the cylinder number on the switchboard, fire seperating core then has and holds discharge sheet that electric sheet works in coordination with switchboard and can be driven in the switchboard inward turning by distributor shaft then the discharge sheet is linked with respectively holding electric sheet successively, and the effect of distributor is by the discharge sheet and holds the centre electrode that electric sheet is assigned to the high-tension current that produces in the high-tension coil each cylinder spark plug successively.

Petrol engine ignition mechanism of the prior art is a kind of ignition mechanism of single spark-type, and promptly each cylinder is only installed a spark plug, includes only the other utmost point of a pair of centre electrode and ground connection in each spark plug, only produces a high-voltage spark when lighting a fire at every turn.The outstanding defective of the ignition mechanism of this single spark-type is that the electrical spark energy is low, and cause a series of other problems thus, at first, because the electrical spark energy is little, initial flame nuclear in the cylinder during mixture combustion is also very little, and it is longer that mixed gas finishes the required time by burning just, and the maximum temperature that combustion gas can reach in the combustion process is on the low side, the maximum pressure that combustion gas produced is less than normal, and engine output is reduced.Secondly, because mixture combustion is slower, when wanting to make the combustion gas maximum pressure to result from 10-15 ° of angle of bent axle arrival atdc, the necessary increasing ignition advance angle of making use of momentum.But before the point, the combustion process of mixed gas can only provide negative torque for bent axle again on bent axle has arrived, and that is to say, some positive moment of torsion will be offset by negative torque and be caused the waste of merit, and engine output is reduced.The 3rd, because the rated speed of petrol engine is very high, the permission of mixed gas is very of short duration period of combustion in the single cylinder, and the Actual combustion process is very slow, thereby certainly will cause mixture combustion insufficient, unburnt inflammable gas enters atmosphere with waste gas, not only cause the waste of fuel, also can cause pollution to atmosphere environment, if containing the waste gas of inflammable gas burns away in gas exhaust piping, then also may cause the petrol engine exhaust back pressure to increase, exhaust sound strengthens, and will influence intake process next time and reduce the output power of motor.In addition, the functional reliability of single spark-type ignition mechanism is relatively poor, especially more is difficult to make the petrol engine ignition trigger under the low temperature and moisture state.

In a word, because electric fiery energy is on the low side, not only functional reliability is poor for single spark-type ignition mechanism, but also can cause the increase of engine output reduction and oil consumption.Therefore, the expert of petrol engine aspect and engineers and technicians are all the time in the improvement of devoting oneself to ignition device of gasoline engine and exploration New Type of Ignition System.Notification number is that the European patent of EP0201173 discloses a kind of dual ignition plug engine ignitor, and 8 spark plugs are divided in 4 cylinders, and two spark plugs are all arranged in each cylinder.Owing to two spark plugs are all arranged in each cylinder, can produce two electrical spark simultaneously, so the dual ignition device can improve the electrical spark energy, strengthen the igniting effect, this is obviously self-evident again.But the practical application of dual ignition device but has significant limitation.At first, dual ignition device substituting poor wants to substitute single ignition system that present Global Access is used with dual spark plug system, must change the structure of cylinder head, increases spark plug and revolves the hole.Secondly, cylinder head is original just to be quite full, and except spark plug revolves the hole, also will arrange valve, cooling water channel etc., and continuation increase spark plug revolves the hole not only can make cylinder head more crowded, but also the intensity of cylinder head is reduced, and increases the probability of leaking.Therefore, the dual ignition device is not so far yet by common employing.

Purpose of the present invention promptly is under the prerequisite that does not change air cylinder head structure, design a kind of petrol engine ignition mechanism with high electrical spark energy, to improve the ignition performance of motor, improve the functional reliability of ignition mechanism, and finally improve output power, the reduction fuel consume of motor.

To achieve these goals, the present invention only installs under the prerequisite of a spark plug at a cylinder, the independently other utmost point of centre electrode and ground connection is set in same spark plug more than two pairs mutually, thereby obtains a kind of multi spot spark plug that can produce a plurality of high-voltage sparks simultaneously.Meanwhile, in the igniting line chart, be provided with sparking-plug electrode logarithm equal number same around to, with the high-tension coil of the number of turn, and by the multiple spot distributor with produce in each high-tension coil etc. the synchronous high-tension current of voltage introduce each centre electrode of multi spot spark plug respectively, make each to producing a plurality of high-voltage sparks simultaneously between the centre electrode and the other utmost point.Because the multi spot spark plug can produce a plurality of high-voltage sparks simultaneously, therefore, can significantly improve the electrical spark energy, thereby overcome the low intrinsic defect of single spark-type ignition mechanism electrical spark energy.From improving the electrical spark viewpoint of energy, in the spark plug electrical spark count many more favourable more, but, electrical spark is counted when too much, the logarithm of the centre electrode and the other utmost point is a lot, and it is very complicated that the structure of spark plug and high-tension distribution panel will become, and the volume of spark plug also can correspondingly increase, spark plug on the cylinder head revolves the hole and also certainly will strengthen, and the available engine air cylinder head structure also must be done corresponding change.In order to significantly improve the electrical spark energy, not cause spark plug and high-tension distribution panel structure too complicated again, in order under the situation that does not change the available engine air cylinder head structure, to replace single spark-type spark plug, select the spark of multi spot spark plug to count to be at 3 to suit with the multi spot spark plug.Being example with 3 simultaneous ignition devices of petrol engine promptly below is described in further detail the technical characteristics of multiple-point synchronous igniter for gasoline engine of the present invention.

Accompanying drawing 1 is the electrical schematic diagram of 3 simultaneous ignition devices of petrol engine;

Accompanying drawing 2,3,4 is respectively front view, the top and bottom perspective views of 3 spark plugs:

Accompanying drawing 5,6 is respectively the A-A sectional view and the plan view of 3 distributors.

With reference to the accompanying drawings 1,3 simultaneous ignition devices of petrol engine mainly are made up of spark coil, 3 distributor F and 3 spark plug H.Spark coil comprises 1 low voltage winding L and 3 high-tension coil L1, L2, L3, is wrapped in former limit and the secondary of same transformer T respectively.3 high-tension coil L1, L2 and L3 are around to identical, equal turn numbers, so the size of the high-tension current that produces in each high-tension coil identical with phase place (promptly synchronous).

2-4 with reference to the accompanying drawings, 3 spark plugs mainly are made of insulating ceramic, steel sleeve and 3 centre electrodes.Insulating ceramic 1 is cylindrical, is made by the insulation porcelain material, and its central authorities have the through hole that 3 one-tenth " product " font distributes, and the top has " Y " shape barricade 2 and each through hole is separated, and the middle part has the shoulder 3 of working in coordination with steel sleeve, and the bottom is positive three lobe cylindricalitys.Steel sleeve 4 approximate circle tubulars, both ends open, be sleeved on the insulating ceramic 1 middle part outside and with insulating ceramic 1 sealing, its top is positive six square nut shapes, the bottom has the external screw thread 5 of working in coordination with engine cylinder cap, and the bottom has 3 along the other utmost point 6 of the equally distributed ground connection of cover end circumference.3 centre electrodes 7 are fixed on respectively in 3 through holes of insulating ceramic 1 central authorities, and the top of each centre electrode all has a wiring terminal 8, and stretch out outside the insulating ceramic 1 its bottom, respectively with the other the utmost point 6 corresponding and maintenance certain intervals of 3 ground connection.

With reference to the accompanying drawings 5,6,3 distributors mainly are made of switchboard and fire seperating core, fire seperating core 9 near cylindrical, make by insulating material, the top that is fixed on distributor shaft 10 also can be by distributor shaft 10 rotary driving, its end face is equipped with 3 concentric contact rings 11,3 outstanding discharge sheets 12 are equipped with at one side different heights place, each sheet that discharges links with 3 contact rings 11 respectively by the lead of pressure injection in fire seperating core, switchboard 13 approximate circle tubulars, make by insulating material, button covers on the fire seperating core 9, keeps certain interval between its inner top surface and fire seperating core end face, its top have 3 be used to connect high-voltage conducting wires also respectively with 3 contact rings of fire seperating core, 11 corresponding jacks 14, jack is embedded with conduction copper sheathing 15, and the contact screw 16 of working in coordination with copper sheathing 15 and being used to adjust jack and contact ring gap value is housed in the copper sheathing 15.Be evenly distributed with the high-voltage conducting wires socket 17 that number equates with the cylinder number around the switchboard top, 3 conducting sheet in socket 18 are equipped with at socket 17 inwall different heights places respectively, be equipped with 3 19,3 of electric sheets that hold of working in coordination with 3 of fire seperating cores discharge sheet respectively and hold electric sheet and link with 3 conducting sheet in socket 18 respectively by the lead of pressure injection in switchboard at the different heights place on the switchboard inwall under the socket 17.When 3 distributor fire seperating cores are rotated in switchboard by the distributor shaft driving, 3 groups of discharge sheets and hold electric sheet and link respectively, 3 high-tension currents that produce among 3 high-tension coil L1, L2, the L3 respectively through jack, contact ring, discharge sheet, hold electric sheet and socket flows into 3 centre electrodes in same 3 spark plugs and produce 3 high-voltage sparks simultaneously between the 3 pairs of centre electrodes and the other utmost point.

Preliminary test shows, under the situation that does not change engine structure and technology status, adopt 3 simultaneous ignition devices to replace original single spark-type ignition mechanism, can make the maximum output of motor improve more than 6%, max. output torque improves more than 4%, and engine power performance has obtained tangible improvement.When power performance was improved, fuel consumption descended more than 3%, and when amounting to into constant power output, fuel consumption can descend more than 10%.In addition, tail is put the discharged flue gas turbidity and is also obviously descended, and the situation of cold starting difficulty also thoroughly changes.In a word, the electrical spark energy height of multiple-point synchronous igniter for gasoline engine of the present invention can improve the functional reliability of ignition mechanism and the output power of final raising motor greatly, reduces fuel consume, reduces environmental pollution.Therefore, the present invention can be widely used as various ignition device of gasoline engine.

Claims (3)

1, a kind of ignition device of gasoline engine comprises spark coil, distributor and spark plug, and spark coil comprises low voltage winding and high-tension coil, is wound in the former limit and the secondary of transformer respectively; Distributor is made of switchboard and fire seperating core, what have on the switchboard that the group number equates with the cylinder number holds electric sheet, fire seperating core have with switchboard hold discharge sheet that electric sheet works in coordination and can by the distributor shaft driving in the switchboard inward turning then make discharge sheet successively with respectively hold electric sheet and link; The number of spark plug equates with the cylinder number, is installed in that cylinder covers and corresponding with each cylinder, and each spark plug all comprises the centre electrode and the other utmost point of ground connection that is used to produce high-voltage spark; When fire seperating core rotated in switchboard under distributor shaft drives, the high-tension current that produces in the high-tension coil flowed into corresponding central electrode and produce high-voltage spark between the centre electrode and the other utmost point through fire seperating core and switchboard; The invention is characterized in described spark coil have 3 with around to, with the high-tension coil of the number of turn, described distributor is 3 distributors that have 3 groups of discharge sheets and hold electric sheet; Described spark plug is 3 spark plugs that have the 3 pairs of centre electrodes and the other utmost point.

2, ignition device of gasoline engine according to claim 1 is characterized in that described 3 spark plugs are made of insulating ceramic, steel sleeve and 3 centre electrodes; Insulating ceramic is cylindrical, is made by the insulation porcelain material, and its central authorities have the through hole that 3 one-tenth " product " font distributes, and the top has " Y " shape barricade and each through hole is separated, and the middle part has the shoulder of working in coordination with steel sleeve, and the bottom is positive three lobe cylindricalitys; Steel sleeve approximate circle tubular, both ends open, be sleeved on the insulating ceramic middle part outside and with the insulating ceramic sealing, its top is positive six square nut shapes, the bottom has the external screw thread of working in coordination with engine cylinder cap, and the bottom has 3 along the other utmost point of the equally distributed ground connection of cover end circumference; 3 centre electrodes are fixed on respectively in 3 through holes of insulating ceramic central authorities, and the top of each centre electrode all has wiring terminal, and insulating ceramic outer and other extremely corresponding with 3 ground connection respectively and maintenance certain interval are stretched out in its bottom.

3, ignition device of gasoline engine according to claim 1, it is characterized in that described 3 distributors are made of switchboard and fire seperating core, the fire seperating core near cylindrical, make by insulating material, the top that is fixed on distributor shaft also can be by the distributor shaft rotary driving, its end face is equipped with 3 concentric contact rings, 3 outstanding discharge sheets are equipped with at one side different heights place, each sheet that discharges links with 3 contact rings respectively by the lead of pressure injection in fire seperating core, switchboard approximate circle tubular, make by insulating material, button covers on the fire seperating core, its inner top surface and fire seperating core end face keep certain interval, its top have 3 be used to connect high-voltage conducting wires and respectively with 3 corresponding jacks of contact ring of fire seperating core, jack is embedded with the conduction copper sheathing, the contact screw of working in coordination with copper sheathing and being used to adjust jack and contact ring gap value is housed in the copper sheathing, be evenly distributed with the high-voltage conducting wires socket that number equates with the cylinder number around the switchboard top, 3 conducting sheet in socket are equipped with at socket inwall different heights place respectively, be equipped with 3 respectively and hold electric sheet with fire seperating core discharge sheet is worked in coordination at the different heights place on the switchboard inwall under the socket, and 3 are held electric sheet and link with 3 conducting sheet in socket respectively by the lead of pressure injection in switchboard.

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