CN2217692Y - Capacitive-discharge type electronic ignitor - Google Patents

Abstract

The utility model relates to a capacitive-discharge type electronic igniter which is composed of a voltage source, a charge and discharge circuit, a storage capacitor, a photoelectric control circuit, a magnetor rotor, a reflecting zone, an ignition coil and a sparking plug, wherein, the reflecting zone is arranged in or outside the magnetor rotor and can also be arranged at the place where the magnetor rotor rotates synchronously with a crankshaft of a gasoline engine. Because one-time invalid discharge in an exhaust stroke is controlled, the service lives of the ignition coil and the sparking plug are obviously extended. The photoelectric control circuit causes an ignition advance angle to be controlled in larger range, fuel combustion becomes more sufficient, fuel oil to be saved by more than 35%, and tail gas pollution to be reduced by about 50%. The utility model can be suitable for the gasoline engine of a two-stroke motorcycle, and can also be used for the small gasoline engines of other types.

Description

The capacitor discharge type ignition

The utility model relates to ignition, relates in particular to the capacitor discharge type ignition (C.D.I.) that motorcycle engine is used.

The capacitor discharge type ignition of prior art whenever rotates a circle promptly 360 when spending at the motorcycle gasoline engine bent axle, discharges twice.Be time to be in compression stroke at the end, this is effective igniting; Another time is in exhaust process, is once invalid discharge.This time invalid just discharge, except making spark coil and spark plug shorten one times working life, increased the rate of breakdown of ignition mechanism, also had the shortcoming of a maximum, that is exactly the waste of fuel problem that the special construction owing to the two-stroke gasoline motor causes.When two-stroke gasoline motor during in exhaust stroke, exhaust port and air-vent and air-vent are also opened in succession simultaneously, and the overlapping of degree more than 100 is arranged on phase place.In combustion gas, the fresh burning mixture that compresses through descent of piston also enters cylinder by air-vent, and the once invalid arcing of spark plug at a time when this.After burning mixture enters in the cylinder, contact, participated in burning to a certain extent with nearly 3000 electrical spark of spending that spark plug sends.Because pressure, density relation, this problem is still not fairly obvious at the low speed segment of engine running, but when engine speed reaches 5000 rev/mins, because piston has only several milliseconds by the time that lower dead centre arrives upper dead center, and this moment spark plug spark hold time and reach 1 millisecond more than, nearly 1/4th time is arranged, and burning mixture all participates in burning.This burning has increased the waste of fuel.Because burning mixture does not still reach the condition of outburst on temperature, concentration and pressure, this burning has just become partial combustion, and this also is that the two-stroke gasoline motor increases at the blowdown flow rate that high regime caused, the one of the main reasons of fuel consumption increase.

The purpose of this utility model is, overcomes the deficiencies in the prior art part, provides a kind of simple in structure, can give full play to the theoretical power (horse-power) of existing motorcycle two-stroke gasoline engine, saves the novel capacitor discharge type ignition of fuel oil.

Capacitor discharge type ignition described in the utility model, by voltage source, charge-discharge circuit, ignition angle control circuit, spark coil, spark plug and with gasoline engine crank synchronously the reflective areas of rotation form.In magnetogenerator when rotation,, magnetogenerator charges and induces the electric current of positive and negative alternation in the electric winding.When on the magnetogenerator charging winding when negative just down, electric current charges to storage capacitor by semiconductor diode, with the needed electrical power storage of spark coil in electric capacity.In order to improve petrolic high speed performance, in circuit, be provided with diode, the loop of a quick charge is provided for electric capacity, make charging current needn't pass through the elementary of spark coil, petrol engine is obviously improved in the performance of high regime, also avoided simultaneously because the interference that charging current causes entire circuit through the elementary induced potential of spark coil.Go up negative timing down when magnetogenerator charging winding because the magneto rotor rotation becomes, the forward voltage drop of utilizing the diode PN junction with Control of Voltage about 4 volts, to voltage source that changes with engine speed within the specific limits of ignition angle control circuit.At this moment, light emitting diode obtains electric current through resistance, emits beam.Owing on the magneto rotor reflective areas is arranged, rotate synchronously with crankshaft for gasoline engine, when reaching ignition angle, the light that light emitting diode sends reflects through reflective areas, is received by photocell, the photocell internal resistance value diminishes, give conducting electric current of triode, the rapid conducting of triode is to trigger voltage of the silicon controlled control utmost point, the controllable silicon conducting, be stored in the electric capacity electric current rapidly through controllable silicon to the elementary discharge of spark coil.Because electromagnetic induction induces a high pressure in spark coil is secondary, make spark plug sparking, finishes an igniting process.When motor is in exhaust process, though also contain electric energy above the storage capacitor, owing in this scope, do not have reflective areas on the magneto rotor, though light emitting diode gets electroluminescence, but because photocell can not get light, internal resistance is very big, can not provide conducting needed electric current to triode, triode is in cut-off state, the SCR control utmost point can not get trigger voltage, also is in cut-off state, electric capacity discharge off loop, at this moment, invalid discharge is controlled.Magneto rotor continues rotation, when on magnetogenerator charging winding electromotive force becomes, bearing just down, owing to be filled with voltage on the electric capacity, the electromotive force of magnetogenerator charging winding only replenishes slightly for electric capacity, and the terminal voltage of electric capacity is further enhanced, the operating voltage of spark coil also is improved, make electrical spark stronger, the inflammable mixture fluid fuel that enters engine cylinder is rapider, more complete, both improve the dynamic property of motor, also reduced disposal of pollutants simultaneously.

Ignition angle control circuit related in the capacitor discharge type ignition described in the utility model has used optical detection device, and control characteristic and temperature characteristic all are improved largely.Because the photocell frequency response performance is good, thereby makes the extremely resulting control waveform of SCR control very precipitous, makes the silicon controlled triggering and conducting even more ideal.Reflective areas can be arranged on magneto rotor inside, also can be arranged on the outside of magnetogenerator and other and the crankshaft for gasoline engine place of rotation synchronously.Capacitor discharge type ignition described in the utility model, automatically control with photoelectricity, can make startability, low-speed performance, the high speed performance of motorcycle gasoline engine and surmount performance all be improved significantly, fuel consume is descended more than 35%, make the tail gas blowdown flow rate reduce about 50%.Capacitor discharge type ignition described in the utility model is not only applicable to the motorcycle two-stroke gasoline engine, and can be used for the motorcycle four-stroke petrol engine.

Fig. 1 is the mounting point schematic representation of capacitor discharge type ignition described in the utility model.Fig. 2 is the circuit diagram of capacitor discharge type ignition described in the utility model.

Referring now to accompanying drawing 1 and accompanying drawing 2, be described as follows in conjunction with the embodiments: magnetogenerator charging winding L 1 induces the electric current of positive and negative alternation during the magnetogenerator rotation, when bearing just down on the magnetogenerator charging winding L 1, electric current is given storage capacitor C charging by semiconductor diode D5, with the needed electrical power storage of spark coil in capacitor C.In order to improve petrolic high speed performance, constituted the quick charge loop in the charging circuit with semiconductor diode.In circuit, be provided with diode D7, the loop of a quick charge is provided for capacitor C, make charging current needn't pass through the elementary L2 of spark coil (3), petrol engine is obviously improved in the performance of high regime, also avoided simultaneously because the interference that the induced potential of the elementary L2 of charging current process spark coil (3) causes entire circuit.Voltage source is made of semiconductor diode.Because becoming, magneto rotor (1) rotation goes up negative timing down when magnetogenerator charging winding L 1, the forward voltage drop of PN junction of utilizing diode D1, diode D2, diode D3 and diode D4 with Control of Voltage about 4 volts, give voltage source that changes with engine speed within the specific limits of ignition angle control circuit, at this moment, light emitting diode FD obtains electric current through resistance R 1, emits beam.Owing to the reflective areas (2) of a control ignition time is arranged on the magneto rotor (1), rotates synchronously with crankshaft for gasoline engine.When reaching ignition angle, the light that light emitting diode FD sends reflects through reflective areas (2), JBG receives by photocell, photocell JBG internal resistance diminishes, give conducting electric current of triode 8G, the rapid conducting of triode BG, a trigger voltage of the control utmost point of giving controllable silicon CR, controllable silicon CR conducting, the electric current that is stored in the capacitor C discharges to the elementary L2 of spark coil (3) through controllable silicon CR rapidly.The reflective areas (2) of reflection firing command both can be arranged on magneto rotor (1) inside, also can be arranged on the outside of magneto rotor (1) or other and the crankshaft for gasoline engine place of rotation synchronously.Because electromagnetic induction induces a high voltage in the secondary L3 of spark coil (3), make spark plug (4) arcing, finishes an igniting process.When motor is in the exhaust process, though also contain electric energy above the storage capacitor C, but, magneto rotor (1) in this time range, do not have reflective areas (2) because going up, though light emitting diode FD gets electroluminescence, but because photocell JBG can not get light, internal resistance is very big, provides conducting required electric current can not for triode BG, and triode BG is in cut-off state.The controllable silicon CR control utmost point can not get trigger voltage, also is in cut-off state.Capacitor C discharge off loop, invalid discharge this time is controlled, magneto rotor (1) continues rotation, when on the electromotive force of magnetogenerator charging winding L 1 becomes, bearing just down, owing to be filled with voltage on the capacitor C, the electromotive force of magnetogenerator charging winding L 1 only replenishes slightly for it, and the terminal voltage of capacitor C is further enhanced.The operating voltage of spark coil (3) also is improved, and makes electrical spark stronger, and the burning mixture burning that enters engine cylinder is rapider, more complete, has both improved the dynamic property of motor, has also reduced disposal of pollutants.

Because the luminous intensity of light emitting diode FD changes with the variation of electric current and voltage, the characteristics that the photocell JBG of receiving optical signals has the variation conduction resistance value with light intensity also to change again, thus make trigger voltage that the may command CR control utmost point obtains also with petrolic rotation speed change.The petrol engine rotating speed is low, and then trigger voltage is low, and ignition angle diminishes.Petrolic rotating speed height, trigger voltage height then, ignition angle become big.Thereby accomplished that petrolic ignition angle changes automatically according to rotating speed.

Claims (3)

1, a kind of capacitor discharge type ignition, have voltage source, charge-discharge circuit, ignition angle control circuit, spark coil (3), spark plug (4) and with engine crankshaft synchronously the reflective areas (2) of rotation form, it is characterized in that being used to control the place that reflective areas (2) is arranged on and crankshaft for gasoline engine rotates synchronously that storage capacitor discharges according to the igniting needs, both can be arranged on the inside of magneto rotor (1), also can be arranged on the outside of magneto rotor (1).

2, capacitor discharge type ignition according to claim 1 is characterized in that the ignition angle control circuit is made of optical detection device.

3, capacitor discharge type ignition according to claim 1 is characterized in that voltage source is made of semiconductor diode.

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