JPS585095Y2 - Internal combustion engine non-contact ignition system - Google Patents

Description

[Detailed Description of the Invention] The present invention concerns a non-contact ignition device for an internal combustion engine that uses a magnet generator as a power source.

Conventionally, in order to make the ignition system of an internal combustion engine more compact due to the increasing number of poles of magnet generators, a built-in timing sensor has generally been used. Since this is normal, there is a problem in that the ignition timing is too late at the time of starting, making it impossible to start.

In order to solve the above problem, the present invention generates a gentle ignition signal and a relatively steep auxiliary signal obtained from the output voltage of a magnet generator for capacitor charging, and uses this gentle signal to drive the auxiliary semiconductor switching element. By opening and closing the auxiliary signal circuit of the main semiconductor switching element by controlling the It is an object of the present invention to provide a non-contact ignition device for an internal combustion engine that can prevent timing delays.

The present invention will be described below with reference to embodiments shown in the drawings.

In Fig. 1, 1 is the bowl-shaped rotor of the magnet generator, and 2 is the ring-shaped main magnet fixed to the inner peripheral surface of the rotor 1. It is magnetized.

Reference numeral 3 denotes a ring-shaped stator core fixed to the side wall of the internal combustion engine. Twelve protrusions 3a to 31 are formed on the outer periphery of the stator core, and the length in the radial direction of three consecutive protrusions 3a to 3c is In contrast, the lengths in the radial direction of each of the other protrusions 3d to 31 are shortened, and the outermost portions of each of these protrusions 3a to 3 face the main magnet 2 and are aligned approximately on the same circumference. Yes, and furthermore, the three protrusions 33 to 3
A recess 3 door is formed inside the stator core 3 at a portion where the three protrusions 3g to 31 facing the stator core 3 are formed.

Reference numeral 4 denotes a lamp load coil which is wound around nine short protrusions 3d to 31 and connected in series with each other, and serves as a power source for a load such as a lamp.

Reference numeral 5 denotes a U-shaped timing core, which is disposed within a recess 3m on the same plane as the stator core 3 and fixed to the side wall of the internal combustion engine.

6 is a signal coil wound around the middle part of the timing core 5 and serves as a means for generating an ignition timing signal for advance; 7 is a ring-shaped timing magnet;
The poles are magnetized at equal intervals.

A boss 8 is fixed to the crankshaft of the internal combustion engine by a bolt (not shown), and the timing magnet I is fixed to the outer peripheral surface of the boss 8, and the rotor 1 is fixed to the boss 8 via a rivet (not shown). It is.

When 9 is wound around the three protrusions 3a, 3b, and 3c,
Six cycles of output voltage are generated per revolution of the internal combustion engine by the capacitor charging coils, both connected in series with each other, the charging end of which is connected to the anode of the auxiliary thyristor 24.

10 is a half-wave short-circuiting diode connected in antiparallel to the capacitor charging coil 9, 11.12 is a rectifying diode, 13 is a SIRISK which is a main semiconductor switching element, 14 is a capacitor, 15 is an ignition coil, and 16 is a This spark plug is connected to the secondary side of the ignition coil 15 and is disposed in a cylinder of a two-cycle internal combustion engine.

Reference numeral 24 denotes an auxiliary thyristor serving as an auxiliary semiconductor switching element, and a signal coil /I/6 is connected between its gate and cathode via a diode 12.

Further, both the main magnet 2 and the timing magnet I are made of permanent magnets.

Next, the operation of the device of the present invention having the above structure will be explained.

As the internal combustion engine rotates, the boss 8 and the rotor 1
It rotates once per revolution in the direction of the arrow shown in the figure, and as a result, the magnetic flux of the main magnet 2 causes the consonde charging coil 9 and the lamp load coil 4 to receive 6 cycles per revolution of the internal combustion engine, as shown in Figure 2a. A relatively steep AC output voltage is generated, and a relatively gentle output voltage as shown in FIG. 2 is generated in the signal coil 6 due to the magnetic flux of the timing magnet T.

When the voltage generated by the capacitor charging coil 9 rises in the positive direction at the angle θ1 shown in FIG. - Charge the capacitor 14 multiple times in the grounded circuit as shown in Figure 2C.

At low speeds such as when starting the internal combustion engine, a positive voltage starts to be generated in the signal coil 6 at the angle θ2 shown in FIG. Current flows in the circuit from the gate and cathode of thyristor 24 to the gate and cathode of thyristor 13,
At the angle θ3 shown in FIG. 2, the output voltage of the signal coil 6 changes to the gate 1. Although it reached Riga level,
At this time, since the voltage generated by the capacitor charging coil 9 is in the negative direction, the auxiliary thyristor 24 is not conductive.

Then, when a positive voltage is generated in the capacitor charging coil 9 at the angle θ5 shown in FIG.
A current flows through the gate-cathode circuit of No. 3, and when the output voltage of the capacitor charging coil/I/9 reaches the gate/cathode level of the thyristor 13 at an angle θ4 shown in FIG. 2, the thyristor 13 becomes conductive.

As a result, the charge in the capacitor 14 is rapidly discharged in the circuit on the primary side of the capacitor 14, the thyristor 13, and the ignition coil 15.

As a result, a high voltage is generated on the secondary side of the ignition coil 15, and an ignition spark is generated at the ignition plug 16.

Here, the diode 24a is used to cause a return current to flow through the primary side of the ignition coil 15 to lengthen the arc duration of the ignition spark.

Next, at medium to high speeds of the internal combustion engine, the rising slope angle of the output waveform of the signal coil 6 gradually increases as the internal combustion engine slows down, and the voltage generated in the signal coil 6 itself increases to the thyristor 1.
When the gate trigger level of 3 is exceeded, the signal coil/1/
The thyristor 13 becomes conductive due to the current flowing in the circuit consisting of the diode 12 - the gate and cathode of the auxiliary thyristor 24 and the gate and cathode of the thyristor 13, thereby producing an ignition spark at the ignition plug 16.

As a result, the ignition timing is advanced from the angle θ4 shown in FIG. 2 to the angle θ2 side as the rotational speed of the internal combustion engine increases.

Furthermore, at low speeds such as when starting the internal combustion engine, as mentioned above, since the voltage generated in the signal coil 6 does not reach the gate trip force level of the thyristor 13 or higher, the relatively steep output of the capacitor charging coil 9 The ignition timing is maintained at approximately θ4, which is the angle at the lowest advance position.

As a result, as shown in FIG. 3, the ignition angle is constant at low speeds and advances as the engine speed increases at medium and high speeds.

In the above embodiment, the timing core 5 around which the signal coil 6 is wound is built into the magnet generator, but it may be provided outside the magnet generator.

Further, in the above embodiment, the capacitor charging coil 9 of the magnet generator is connected to the gate of the thyristor 13, but instead of the capacitor charging coil 9, the capacitor charging coil 9 of the magnet generator is connected to the gate of the thyristor 13. You may also connect it to

For example, in FIG. 1, 1. , ' One of the lamp load coils 4 wound around each of the protrusions 3d to 31 of the stator core 3 is separated from the load such as a lamp and connected to the gate of the thyristor 13 to control the thyristor 13. You can also do it.

As described above, in the device of the present invention, the control pole of the main semiconductor switching element for discharging the charge of the capacitor through the primary side of the ignition coil is activated by the rotation of the multi-pole magnet rotor. An auxiliary semiconductor switching element connected to the generating coil of a magnet generator that generates multiple cycles of half-wave output voltage with a relatively steep rise angle per rotation, alternating positive and negative, and connected in series with the control pole of the main semiconductor switching element. As the rotational speed of the internal combustion engine increases, the rising slope angle gradually increases at the control pole of It rises from O in one direction when it has advanced by more than the angular width, and rises from O at a later point in time than the time when the half-wave output generated at the lowest advance angle position of this power generating coil /'l/ falls to O. Since the advancing ignition timing signal generating means which generates a falling half-wave output voltage is continued, the output voltage of the generating coil generates multiple cycles per rotation of the multi-pole magnet rotor at low speeds such as during internal combustion side start operation. While the output voltage is applied to the control pole of the auxiliary semiconductor switching element by the advance ignition timing signal generating means, the half-wave output pressure generated at the lowest advance position is transmitted to the main semiconductor via the auxiliary semiconductor switching element. The voltage is applied to the control pole of the switching element, thereby obtaining an almost fixed ignition timing characteristic, and when the internal combustion engine is at medium to high speeds, the main semiconductor switching element is directly controlled by the output voltage of the ignition timing signal generation means for advancing the ignition timing. The timing can be advanced, and this makes it possible to effectively use the output voltage generated in the generator coil of the magnet generator by the rotation of the multi-pole magnet rotor of the magnet generator to specially set the signal generator. This has the excellent effect of preventing the ignition timing from being delayed too much at low speeds such as during startup.

[Brief explanation of the drawing]

Fig. 1 shows the constituent parts of an embodiment of the device of the present invention, Fig. 2 is a waveform diagram of each part to explain the operation of the device of the invention shown in Fig. 1, and Fig. 3 shows the device of the invention shown in Fig. 1. FIG. 3 is an ignition advance angle characteristic diagram in FIG. 6...Signal coil forming advance ignition signal generation means, 9...Capacitor charging coil forming the generating coil of the magnet generator, 13...Main semiconductor switching element Eggplant thyristor, 14... Capacitor, 15... Ignition coil, 16...
・Spark plug, 24...Auxiliary spark plug forming an auxiliary semiconductor switching element.

Claims (2)

[Scope of utility model registration request] (1) A magnet generator with a multipolar magnet rotor, a capacitor charged by the capacitor charging coil of this magnet generator, and a voltage connected to this capacitor and applied to a control pole that is A main semiconductor switching element is connected to the main semiconductor switching element, which becomes conductive due to the conduction of the main semiconductor switching element; An ignition coil that induces high voltage, and two parts of this ignition coil.
An ignition plug is connected to the secondary side and generates an ignition spark by the high voltage induced in the secondary side, and the magnet is connected to the control pole of the main semiconductor switching element and rotates by the rotation of the magnet rotor. A generator coil of the magnet generator, which generates a half-wave output voltage with a relatively steep rise and slope angle in positive and negative cycles in multiple cycles per one rotation of the magnet generator, is connected in series with the control pole of the main single-conductor switching element. and an auxiliary semiconductor switching element connected to the control pole of the auxiliary semiconductor switching element, which detects the rotation angle of the internal combustion engine and detects the rotation angle of the internal combustion engine according to a signal applied to the control pole. As the rotation speed increases, the rising angle of inclination gradually increases, and the half-wave output voltage generated in the generating coil at the lowest advance position advances from 0 to the point where it rises in one direction by more than the required advance angle width. A half-wave output voltage that rises in one direction from O at , and falls to 0 at a later point in time than the time at which the half-wave output generated at the lowest advance angle of the generator coil falls to O. A non-contact ignition device for an internal combustion engine, comprising: ignition timing signal generating means for a corner. (2) The power generation/coil connected to the control pole of the main semiconductor switching element is the capacitor charging coil.
Non-contact ignition device for internal combustion engines as described in ).