JPS6282257A - Reference position setting mechanism for full arc pulser - Google Patents

Abstract

PURPOSE:To eliminate a need for a reference position pulse generator separately by forming reference surfaces different from numbers of projections arranged on both circumferences facing each other of a rotor and a stator with a certain preset pitch provided. CONSTITUTION:A full arc pulse 1 is composed of a stator 10 which is fixed on the side of a crank case and of a rotor 11 which is installed on a crank shaft 3 while it is rotated within the stator 10. And numbers of projections 12 and 13 are provided both circumferential surfaces, which face each other, of both of the rotor 10 and the stator 11. In addition, reference surfaces 14 and 15 in a table form are formed on both of the circumferential surfaces at a position where apexes of the projections 12 and 13 meet one another. When an engine starts, alternative electric current with a certain amplitude is generate in coils incorporated in the stator 10 synchronizing with the time when each apex of the projections 12 and 13 meets or does not, besides, the wave form with a large amplitude different from that of waves for the other case is generated when the reference surface 14 and 15 meet each other. And a signal for the ignition timing can be picked up based on the reference surfaces as a reference position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device used in, for example, a spark ignition type internal combustion engine, J3, for generating a pulse signal for determining ignition timing.

[Prior Art] One type of ignition system for spark-ignition internal combustion engines is a capacitive discharge ignition system (CD I system). This system charges a capacitor with voltage supplied from a generator or battery. At the same time, a pulse voltage is applied to, for example, a relay at a certain timing, closing the gap between the capacitor and the ignition coil, discharging each set of electricity stored in the capacitor, and applying high voltage to the secondary coil. This is what induces a spark to fly to the spark plug.

For this reason, motorcycles and the like are equipped with a generator for charging a capacitor and a pulse generator for generating a pulse signal as an ignition signal at a predetermined timing. Of these, the applicant has C
Aiming to improve efficiency in DI systems, we have already developed a full-circumference pulsar in which unevenness is formed opposing the entire circumference of the stator and rotor of a generator, and an electromotive force is obtained by integrating the entire circumference.

[Problem that the invention seeks to solve]

As a result of reviewing the ignition system with such a background in order to further improve it, we found that a constant AC output is generated by the all-round pulser υ, and the rotor attached to this all-round pulser is directly connected to the crankshaft. By focusing on the fact that the AC waveform is output in the conventional manner, if the waveform changes at a predetermined timing, that is, at the time of ignition, the reluctor and pulser coil that separately constitute the pulse generator can be eliminated. They found that it would be possible to provide an ignition system with a simpler mechanism.

[Means for solving problems]

That is, the present defense has been completed based on the above-mentioned viewpoint, and the reference position setting gate mechanism in J3 of the all-round pulsar according to the present invention is composed of [1-1 and a stator fixed around it, and the above-mentioned [-1- The stator and the stator have a large number of protrusions arranged at a constant pitch around the opposing sides, and a reference plane different from the set pitch of the protrusions is formed in a part of the periphery of each. The aim is to achieve the above objectives.

[Examples] Hereinafter, the present invention will be specifically described based on illustrated examples. FIG. 1 schematically shows a full-circle pulsar 1 to which the present invention is applied, an engine 2 used in this pulsar, and a related ignition system. That is, this full-circumference pulser 1 is installed near the end of the crankshaft 3 of the engine 2 as an example.
is provided outside the crankcase 4,
The output of this omnidirectional pulser 1 drives the CDI unit 5,
The output of this CDI unit 5 is outputted from an ignition coil 6 to a spark plug 7, where a spark is generated.

The full-circle pulser 1 of the present invention applied to such a device consists of a stator 10 fixed to the crankcase side and a rotor 11 attached to the crankshaft 3 and rotating inside the stator 10. Each stator 10 and rotor 11 have a pair f+J'! ? Numerous protrusions around the area 1
2.13. And this protrusion 12.1
3 changes the setting pitch of the protrusions in a part of the entire circumference of the plate 15, and forms, for example, a U-shaped reference surface 14.15 that matches the top of the protrusion 12.13. The stator 10 has a coil 16 built therein, and the rotor 11 side is made up of magnets, for example.

The operating state of such a device will be explained below. When the engine 2 is started, the rotor 11 directly connected to the crankshaft 3 starts rotating within the stator 10. In such a case, when the tops of the protrusions 12 of the stator 10 and the protrusions 13 of the rotor 11 match, and when the tops do not match, the coil 1
6, an alternating current output with a constant amplitude is generated as shown in FIG. Of course, at this time, some of the protrusions 12 on the stator 10 side
The reference plane 15 on the rotor 11 side and the protrusion 13 on the rotor 11 side are aligned with the reference plane 14 on the stator 10 side. 12 and 13 is output, and there is no influence due to the position of these components. However, if the rotating state matches the reference plane 14.15 at a certain timing, for example as shown in Fig. 3, the rotational state will approach the reference plane 14.15 for a certain period of time, and as a result, other This produces a waveform with a large amplitude that is different from the range of . If you want to set a certain standard value when such a waveform with a large amplitude is output, for example, set the number of the large amplitude as appropriate.
If we use the waveform that occurs after a certain number of times when the cylinder is open as the reference position, we can extract the signal that informs the ignition timing from there. Of course, the signal extracted here is used as the gate voltage of a thyristor in a conventional CDI unit, for example, to discharge the capacitance stored in the capacitor.

In the embodiments described above, magnets are used in the rotor 11 to act as a generator, but when the rotor 11 is made of a mere magnetic material instead of a permanent magnet, it does not act as a generator and is simply a coil 16. The output is obtained as so-called inductance due to the action of . When used as such an inductance, a reference oscillator 21 to be compared is inserted into the oscillation circuit 20 to which the oscillation output from the stator 10 is input, as shown in FIG.
A signal at a predetermined timing can be obtained by detecting the displacement from the reference frequency.

That is, the output from the oscillation circuit 20 is inputted to the frequency comparison circuit 23 via, for example, a bandpass filter 22 for improving the noise margin, while, for example, a low frequency signal from the reference oscillator 21 is also inputted to the frequency comparison circuit 23. It will be done. The frequency comparison circuit 23 oscillates a pulse signal at a predetermined timing by detecting the displacement from the reference frequency. In the present invention, the reference surface 14.15 is formed to match the top of the protrusion 12.13, but it may also be formed to match the bottom and be separated from the reference surface 14.15. Of course, there is no problem.

〔Effect of the invention〕

As described above, the present invention is capable of generating a control signal at a constant timing by simply changing the shape of a part of the protrusion, for example, by changing the shape of a part of the protrusion of a pulse signal in a full-circle pulse that oscillates an AC output. As a result, there is no need to provide a pulse generator consisting of a reluctor and a pulser coil, which were conventionally provided separately in this type of device, resulting in a simpler configuration, achieving stable operation of the device and lower costs. It is something.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram showing the combination of the present invention and an internal combustion engine to which the same is applied, FIG. 2 is a longitudinal side view of the present invention, FIG. 3 is a front view of the present invention, and FIG. The figure is an output diagram of the circumferential pulser of the present invention, and FIG. 5 is a circuit diagram showing another embodiment. 1...All-around pulsar 2...Engine 3...
Crankshaft 5...CDI unit 6...Ignition coil 7...Spark plug 10...
・Stator 11...Rotor 12.13...
Projection 14.15...Reference surface 16...Coil
20... Oscillation circuit 21... Reference oscillator 22
... Bandwidth filter 23 ... Frequency comparison circuit Applicant: Agent of Honda Motor Co., Ltd.
Patent Attorney Kido Den Part 1
Kido-hiko (@ /
JS Jl” 4-(Procedural Amendment January 21, 1985 Patent Application No. 221590 2, Title of Invention Reference Position Setting Mechanism 3 in All-round Pulsar, Person Making Amendment Relationship with Case Patent Applicant (532) Honda Motor Co., Ltd. 4, Agent 5, Date of Amendment Order Voluntarily Submitted As per the appendix (1) "Pulse" next to "Aim for 1" in the 2nd line of the 3rd page of the specification. In the 5th line, next to ``I do.'', ``However, the reference position cannot be obtained as it is, so a separate reference position pulser is provided.'', and in the 13th line of the same page, after ``Separately'', ``The reference position is not obtained.'' (2) Correct ``1 transmission output'' on page 8, line 14 of the same book to ``inductance change.'' (3) Change ``r firing'' on page 9, line 10 of the same book to ``occurrence.'' (4) Insert "reference position" after "consisting of" in line 6 of page 10 of the same book.

Claims (1)

[Claims] 1. It consists of a rotor and a stator fixed around the rotor, and the rotor and the stator have a large number of protrusions arranged at a constant pitch on opposing circumferential surfaces, and a set pitch of the protrusions is formed on a part of each circumferential surface. is a reference position setting mechanism for an all-round pulsar, which is characterized by forming different reference planes.