JPH01216072A - Ignition timing adjustment device - Google Patents

Abstract

PURPOSE:To obtain a control device capable of using in common to a plurality of engines having different output characteristics by providing a selecting means of fixed time signals in an ignition timing arithmetic circuit, and obtaining a plurality of ignition timing characteristics only by changing the terminal connection of the selecting means. CONSTITUTION:A spark advance circuit 19 outputting a spark advance signal to the whole engine speed range of an engine based on a first crank angle signal is provided. A fixed angle circuit 20 outputting a signal only in a fixed angle range of the crank based on the first crank angle signal is provided. Further, a first fixed time circuit 21 outputting a signal only for a fixed period of time based on the fixed angle signal and a second fixed time circuit 22 outputting a signal only for a fixed period of time based on the first angle signal are also provided. On the other hand, a selecting means 26 combining the signals from the fixed angle circuit 20 and each fixed time circuit 21, 22 selectively is provided. A switching element 23 controlling the signals of the spark advance circuit 19 based on the signal from the selecting means 26 is also provided.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an ignition timing control device, and more particularly to an ignition timing control device that effectively retards ignition timing in a high engine speed range.

(Prior Art) Generally, in engines used in motorcycles, etc., the ignition position is usually 5° to 10 before top dead center in the low speed rotation range.

The angle is advanced at a certain level, and at higher speeds, and set at 25 degrees to 351 degrees before top dead center at high speeds.

However, in some two-stroke engines, if the ignition timing in the high speed range is retarded relative to the ignition timing in the medium speed range, the engine's maximum output can be sustained in the high speed range. Of course, a number of devices for controlling the ignition timing of such engines are known.

(Problem to be Solved by the Invention) However, the output characteristics of this type of engine are not universal, and therefore the retard characteristics must also be changed to correspond to the output characteristics of each engine. however,
Conventional ignition timing control devices have circuits configured to operate based on one type of ignition timing characteristic for each control device, so they cannot be applied to all such engines, and the output characteristics There was an inconvenience in that ignition timing control devices had to be manufactured for each different engine.

An object of the present invention is to provide an ignition timing control device that can obtain a plurality of ignition timing characteristics by changing part of the wiring using a selection means to correspond to the output characteristics of various engines.

(Means for Solving the Problems) The ignition timing control device of the present invention includes an engine ignition circuit that ignites an engine, and a first angle signal that is synchronized with the rotation of the engine and that generates a first angle signal at a first crank position. an angular position detection sensor that generates a second angle signal at a second crank position delayed from the first crank position;
an ignition timing calculation circuit that operates based on the angle signal and supplies an output signal to a semiconductor switching element provided in the engine ignition circuit to operate the engine ignition circuit; at least one advance angle circuit that operates based on the angle signal and outputs a signal for advancing the engine over substantially the entire rotational speed range; at least one constant angle circuit that outputs an output; a first constant time circuit that operates using a constant angle signal necessary for advancing the angle as a reference signal in the advance angle circuit and outputs the signal for a certain period of time;
at least one second constant time circuit that operates based on the first angle signal and outputs a signal for a certain period of time, the constant angle circuit, the first constant time circuit, and the second constant time circuit; A selection means for selectively combining the signals, and a switching element that controls the output signal from the advance circuit according to the output signals combined by the selection means and supplies the signal to the engine ignition circuit. Features.

(Function) According to the ignition timing control device of the present invention, if one ignition timing characteristic is brought out by the selection means of the device in accordance with the ignition timing characteristic required by the engine, the ignition timing control device of the present invention will change the ignition timing characteristic as the engine rotates. the first angle signal and the second angle signal to the angular position detection sensor.
An angle signal is generated every rotation, and based on this first angle signal, an advance circuit of the ignition timing calculation circuit outputs a signal for advancing the ignition timing. This signal is applied to the semiconductor switching element of the engine ignition circuit via a switching element, and the operation of this switching element is controlled by an output signal which is a combination of the signals from the constant angle circuit, the first and second constant time circuits. The 0 selection means which is controlled by the ignition timing circuit and which obtains a predetermined ignition timing characteristic selectively changes the combination of signals from these constant angle circuits and the first and second constant time circuits according to various types of engines. Since the output signals combined by this selection means change the operation of the switching element, the supply timing of the output signal from the advance circuit to the engine ignition circuit is changed, and different ignition timing characteristics are obtained, which can be used for various engines. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the ignition timing control device of the present invention will be described in more detail below with reference to the accompanying drawings.

FIG. 1 shows an ignition timing control device according to an embodiment of the present invention. In FIG. 1 showing the ignition timing control system of this embodiment, 1 is an engine ignition circuit, which is constructed as follows. That is, 2 is a generator coil of a magnet generator driven by the engine, 3 is a diode that rectifies the generated output of the generator coil 2, 4 is a capacitor charged by the rectified output of the diode 3, and 5 is a primary coil. Ignition coil consisting of 5a and secondary coil 5b, 6 is ignition coil 5
7 is a thyristor which is a semiconductor switching element that discharges the charge in the capacitor 4 to the ignition coil at the time of ignition of the engine, and 8 is a thyristor which generates a constant voltage by the output of the generator coil 2. A power supply circuit for forming a capacitor 9 as shown in FIG. Transistor 10, Zener diode 11. Resistance 12.
13 constitutes a constant voltage circuit.

Furthermore, in FIG. 1, 14 is a signal coil which is an angular position detection sensor that generates positive and negative angle signals in synchronization with the rotation of the engine, and among the positive and negative angle signals, the first angle signal a is a signal coil that corresponds to a predetermined angle signal of the engine. The second angle signal corresponds to a predetermined angle position advanced from the crank position (first crank position), that is, the maximum advanced angle position required by the engine, and the second angle signal is the first angle signal a.
This corresponds to a crank position (second crank position) that is delayed by a predetermined angle from the position where the engine occurs, that is, the maximum retard position required by the engine. The positive second angle signal generated at the maximum advanced angle position is a diode that passes the positive wave of the signal coil 14!
5 and is further applied to the gate of the semiconductor switching element 7 via a gate circuit consisting of a resistor 16 and a capacitor 17.

Reference numeral 18 denotes an ignition timing calculation circuit, which is a feature of the present invention, and is configured as follows. That is, the ignition timing calculation circuit 1
8 is a lead angle circuit 19.8 as shown in FIG. Constant angle circuit 20. First fixed time circuit 21 and second fixed time circuit 2
2. The advance angle circuit 19 selects the first position which is the maximum advance angle position.
Its input portion is connected to one end of the signal coil 14 in order to operate based on the first angle signal a generated at the crank position, and its output portion is connected to the emitter of a transistor 23 acting as a switching element. The collector of this transistor 23 is the output part of the ignition timing calculation circuit 18, and is connected to the gate of the semiconductor switching element 7 of the engine ignition circuit 1, as shown in FIG.

The fixed angle circuit 20, like the advance angle circuit 19, receives the first angle signal a.
Its input portion is connected to one end of the signal coil 14 and its output portion is connected to one input end of the first NOR circuit 24 in order to operate based on . Since the advance angle circuit 19 outputs a constant angle signal necessary for advancing the angle as its original function, the first fixed time circuit 21 operates using this constant angle signal as a reference signal, and one of its output terminals Q is It is connected to the other input terminal of the first NOR circuit 24 and also to the terminal A of the selection means 26 via a resistor 25.

One input end of the first NOR circuit 24 is connected to the terminals A' and B' of the selection means 26 via a resistor 27, and is also connected to the (G) end of the first voltage comparator 2B. ing. Further, the output terminal of the first comparator 28 is connected to the terminal C of the selection means 26, and the terminal C' opposite to the terminal C is connected to the base of the transistor 23 via a resistor 29.

The other output terminal 1 of the first constant time circuit 21 is connected to the second NOR
It is connected to one input end of the circuit 30. Like the advance angle circuit 19, the second constant time circuit 22 has its input connected to one end of the signal coil 14 in order to operate based on the first angle signal a, and its one output end θ is connected to the signal coil 14 through a resistor 31. and the other output terminal 1 is connected to the terminal A of the selection means, and the other output terminal 1 is connected to the second NO.
The other input end of the R circuit 30 and one end of a second voltage comparator 32 are connected via a resistor 33, respectively. The output end of the first NOR circuit 24 is connected to one end of the second comparator 32 via a resistor 34, and the output end of the second NOR circuit 30 is connected to the terminal B of the selection means 26.
is connected to via a resistor 35. The output terminal of the second comparator 32 is connected to the terminal of the selection means 26, and the opposite terminal D' is connected to the terminal C'. Note that H of the first and second comparators 28.32
The ra and (E) ends are grounded through a resistor (not shown) and connected to the output section of the power supply circuit 8 through another resistor (not shown).

The operation of the embodiment configured as described above will be explained using the ignition timing characteristic diagram shown in FIG.

The second angle signal is a direct diode 15. and resistance 16
The signal is applied to the thyristor of the semiconductor switching element 7 through a gate circuit consisting of a capacitor 17 and a signal (49) to (55) in FIG.

On the other hand, when the first angle signal a is input to the advance angle circuit 19, (51), (49), (47) in FIG.
.

It is configured to output a high (H) signal in the range surrounded by (55). The first angle signal a is the advance angle circuit 19
At the same time, the constant angle circuit 20 is set, and the constant angle circuit outputs a high (H) signal while the crank advances (rotates) by a constant angle.

However, since the constant angle circuit 20 is set to an angle below the angle between the first angle signal a and the second angle signal S, this high signal does not appear in the advance angle characteristic shown in FIG. Since it is output throughout the crank angle, the signal output sections (46) (56) in FIG. 4 remain constant even as the rotational speed increases, and therefore (46) in FIG.

This is the range surrounded by (47), (56), and (57). This constant angle circuit 20 is a flip-flop (
FF) and an integral circuit output a high (H) pulse signal after a fixed angle.

Further, the second fixed time circuit 22 is set simultaneously with the rising signal of the advance angle circuit 19, and outputs a high (H) signal for a fixed time. In this way, since this high signal is output for a certain period of time, as the rotational speed increases, the amount of crank angle advance per unit time increases, so the high signal output crank angle range becomes larger, so that ( 46), (47)
, (4B). Further, the first constant time circuit 21 is set in response to a constant angle signal outputted for advancing the angle as an original function in the advance angle circuit 19.
Outputs a high (H) signal for a fixed period of time. In this case as well, since this high signal is for a constant time, the constant angle signal of the advance angle circuit 19 ((46 in FIG. 4)
- (47) ) The high signal output crank angle range becomes larger, and therefore (56) and (57) in Fig. 4.
) (54).

These constant angle circuits 20. When the high (H) signals of the first fixed time circuit 21 and the second fixed time circuit 22 are ORed by the first comparator 2B, (46) in FIG.
, (47), (54), (53), and (56) become a high (H) signal.

Therefore, when the output signal of the advance angle circuit 19 is controlled by the signal from the first comparator 28, the fall of the output signal of the first comparator 28, that is, (52), (
53) and (54), the transistor 23, which is a switching element, is turned on, and the output signal of the advance angle circuit 19, which has been blocked by the transistor 23, is applied to the gate of the thyristor, which is the semiconductor switching element 7. Therefore,
The moment this transistor 23 turns on becomes the ignition timing. Therefore, (50) in FIG. 4 due to the second angle signal
- When the signal of (55) and the signal from transistor 23 are combined, the ignition timing characteristics are (5G) and (5
1), (52).

(53), (54), (55).

In addition, although the above explanation of the operation is based on the assumption that the engine operates from the same rotation speed of 0, in reality, the circuit does not operate below the operating start speed of the circuit (for example, N, rotation in Fig. 4). In operation, as can be seen from the control of the advance angle circuit 19 output by the signal from the first comparator 2B, the first comparator 28
Even if the output of the transistor 23 is low (L) and the transistor 23 is on, it does not affect the ignition timing.

The ignition timing characteristic shown in FIG. 4 is an example, and another ignition timing characteristic can be obtained by simply changing the connection of each terminal of the selection means 26 in the ignition timing calculation circuit 18. That is, in the ignition timing calculation circuit 18 shown in FIG.

The case where D' is connected is shown, and when this is done, the ignition timing characteristic becomes as shown in the characteristic diagram shown in FIG. Further, regarding the selection means 26 of the ignition timing calculation circuit 18, the seventh
When the terminals B, B' and c, c' are respectively connected as shown in the figure, the ignition timing characteristics become as shown in the characteristic diagram shown in FIG.

In this way, by providing the selection means 26 in the ignition timing calculation circuit 1B and changing the connection of the terminals of this selection means 26, various ignition timing characteristics can be obtained. That is, for example, if the ignition timing characteristic is to correspond to an engine whose pattern is preferably as shown in FIG. It is sufficient to manufacture an ignition timing control device in which the

Therefore, this ignition timing control device has so-called versatility that can be adapted to the output characteristics of various engines, and productivity can be significantly improved.

(Effects of the Invention) As explained above, according to the ignition timing control device of the present invention, the ignition timing calculation circuit includes the selection means, and a plurality of different ignition timing characteristics can be obtained by simply changing the terminal connection of the selection means. Therefore, there is no need to manufacture completely different control devices for each engine having different output characteristics, and a highly versatile device can be provided.

[Brief explanation of the drawing]

1 is a circuit diagram showing an ignition timing control device according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing a power supply circuit of the ignition timing control device shown in FIG. 1, and FIG. 3 is a circuit diagram showing the ignition timing control device shown in FIG. A circuit diagram showing an ignition timing calculation circuit in a timing control device in which a selection means is wired to obtain one ignition timing characteristic, FIG. 4 shows an ignition timing characteristic based on the ignition timing calculation circuit shown in FIG. 3. 5 is a circuit diagram similar to FIG. 3 showing an ignition timing calculation circuit in which the wiring of the selection means is changed in order to obtain ignition timing characteristics different from the ignition timing characteristics shown in FIG. 4; FIG. 6 is a characteristic diagram showing ignition timing characteristics based on the ignition timing calculation circuit shown in FIG. 5, and FIG. 7 is a characteristic diagram showing another ignition timing characteristic different from the ignition timing characteristics shown in FIGS. Figure 8 is a circuit diagram similar to Figure 3 showing the ignition timing calculation circuit with changed wiring for the selection 0 means. It is a characteristic diagram showing l...engine ignition circuit, 6... engine ignition plug, 7...
...Semiconductor switching element, 14...Signal coil,
18... Ignition timing calculation circuit, 19... Advance angle circuit, 2
0... constant angle circuit, 21... first constant time circuit, 2
2... Second constant time circuit, 23... Transistor,
26...Selection means. Agent Masuo Oiwa Figure 1 Figure 2 Figure 3 Figure 35 2: Figure 4''N2'v''v4N5g Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] an engine ignition circuit that ignites the engine; and an engine ignition circuit that generates a first angle signal at a first crank position in synchronization with engine rotation and generates a second angle signal at a second crank position delayed from the first crank position. An angular position detection sensor that generates a signal, and operates based on the first angle signal and the second angle signal, and supplies an output signal to a semiconductor switching element provided in the engine ignition circuit to operate the engine ignition circuit. an ignition timing calculation circuit that operates based on the first angle signal and outputs a signal for advancing substantially the entire engine speed range; , at least one constant angle circuit that outputs a signal within a certain angle range of the crank with the first angle signal as a reference, and the advance angle circuit operates for a certain period of time using the constant angle signal necessary for advancing the angle as a reference signal. a first fixed-time circuit that outputs a signal for a fixed time; at least one second fixed-time circuit that operates based on the first angle signal and outputs a signal for a fixed time; the fixed-angle circuit; a selection means for selectively combining the signals from the fixed time circuit and the second fixed time circuit; controlling the output signal from the advance angle circuit according to the combined output signal of the selection means to the engine ignition circuit; An ignition timing control device comprising a switching element that supplies the ignition timing.