JPH01216071A - Ignition timing adjustment device - Google Patents

Abstract

PURPOSE:To obtain a control device having excellent wide usability which can be used in common to a plurality of engines having different output characteristics by providing a selecting means 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:An ignition timing arithmetic circuit operating an engine ignition circuit based on a plurality of crank angle signals is provided with a spark advance circuit 19 outputting a spark advance signal to the whole engine speed range of an engine based on a first angle signal. A fixed angle circuit 20 outputting a signal in a fixed angle range of the crank based on the first angle signal is also provided. Further, a plurality of fixed time circuits 21, 22 outputting signals for a fixed period of time based on the first angle signal or a signal from the fixed angle circuit 20 are provided. On the other hand, a selecting means 26 selectively combining the signals from the fixed angle circuit 20 and each fixed time circuit 21, 22 is provided. A switching element 23 controlling the signal 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) In general, in engines used in motorcycles, etc., the ignition position is normally set to about 5 to 10 degrees before top dead center in low speed ranges, and advanced at medium speeds or higher, and before top dead center in high speed ranges. It is set at 25-35@.

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. Such devices for controlling engine ignition timing are, of course, already well 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, and cannot be applied to all such engines, and the output There is an inconvenience that an ignition timing control device must be manufactured for each engine with different characteristics.

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. The first crank position area is connected to an angular position detection sensor that generates a second angle signal at a delayed second crank position, and an angular position detection sensor that generates a second angle signal at a delayed second 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, a plurality of constant time circuits that operate based on the first angle signal or a signal from the constant angle circuit and output a signal for a certain period of time, the constant angle circuit and the plurality of constant angle circuits; A selection means for selectively combining signals from the time circuit, and a switching element combined by the selection means to control the output signal from the advance angle circuit according to a specific output signal and supply the signal to the engine ignition circuit. There is.

(Function) According to the ignition timing control device of the present invention, if one ignition timing characteristic is made to appear by the selection means of the nuclear device in accordance with the ignition timing characteristic required by the engine, as the engine rotates, A first angle signal and a second angle signal are generated in the angular position detection sensor every rotation, and the advance circuit of the ignition timing calculation circuit advances the ignition timing based on the first angle signal. Output a signal. This signal is applied to a 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 that is a combination of signals from a constant angle circuit and a plurality of constant time circuits, A predetermined ignition timing characteristic can be obtained.

The selection means selectively changes the combination of signals from these fixed angle circuits and the plurality of fixed time circuits according to various types of engines, and the output signals combined by this selection means change the operation of the switching element. Therefore, the supply timing of the output signal from the advance circuit to the engine ignition circuit is changed, different ignition timing characteristics can be obtained, and it is possible to provide ignition timing characteristics that match the ignition timing characteristics required by various engines. .

(Embodiments) Hereinafter, the ignition timing control device of the present invention will be described in more detail with reference to preferred embodiments shown in the accompanying drawings.

The first factor is 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 20, 4 is charged by the rectified output of the diode 3; and an ignition coil consisting of a secondary coil 5b, 6 receives the secondary voltage of the ignition coil 5 and discharges a spark to ignite the engine! Lug, 7 is a thyristor which is a semiconductor switching element that discharges the charge of the capacitor 4 to the ignition fill at the ignition timing of the engine;
8 is a power supply circuit for forming a constant voltage at the output of the generator coil 2, and as shown in FIG. 2, a capacitor 9. Transistor 10. Zener diode 11. Resistance 12.1
3 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. 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 retarded angle change position required by the engine. The positive second angle signal generated at the maximum retardation position passes through a diode 15 that passes the positive wave of the signal fill 14, and further passes through an r-) circuit consisting of a resistor 16 and a capacitor 17 to the semiconductor switching element 7. P-)
is applied to

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 r-gate of the semiconductor switching element 7 of the engine ignition circuit 10, 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 . The first constant time circuit 21 operates based on the operation signal of the constant angle circuit 20, and one output terminal Q thereof is connected to the other input terminal of the first NOR circuit 24 and selected via a resistor 25. Terminal A of means 26
It is connected to the. One input terminal of the first ONOR circuit 24 is connected to the terminals A' and B' of the selection means 26 via a resistor 27, and a first voltage comparator (converter).
It is connected to the (+) end of 28. Further, the output terminal of the first fan/#lator 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 pace of the transistor 23 via a resistor 29.

The other output terminal θ 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 θ is connected to the terminal A of the selection means, and the other output terminal θ is connected to the second NO
The other input terminal of the R circuit 30 and the second voltage comparator (Fun/
The output terminal of the first NOR circuit 24 is the resistor 3.
The output terminal of the second NOR circuit 30 is connected to the terminal B of the selection means 26 via a resistor 135. The output terminal of the second air filter 32 is connected to the terminal of the selection means 26, and the terminal D' opposite the terminal is connected to the terminal C'. In addition, the first and second feces/arm parts 2
One end and the (G) end of 8.32 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 nine-metal embodiment constructed as described above will be explained using the ignition timing characteristic diagram shown in FIG.

The second angle signal is a direct diode 151 and a diode 16
The signal is applied to the thyristor of the semiconductor switching element 7 via an r-t circuit consisting of a capacitor 17 and a capacitor 17, resulting in signals (52) to (45) in FIG.

On the other hand, when the first angle signal a is input to the advance angle circuit 19, (40), (50), (4
7).

It is configured to output a high (H) signal in the range surrounded by (45). The first angle signal a is the advance angle circuit 19
At the same time, the constant angle circuit 20 is set and outputs a high (H) signal while the constant angle circuit line crank advances (rotates) by a certain angle. Therefore, since this high signal is output during a constant crank angle, even if the rotational speed increases, signal output sections (46) (48) in FIG.
) are constant, so (46) and (47
), (49), and (48). This constant angle circuit zO is a free-lag frog (F
F) and the integrator circuit output a high (H) pulse signal as shown in waveform B in Figure 5 after the birth of an Eri constant angle O. Also, the second constant time circuit 22 is set at the same time as the rising signal of the advance angle wt19. , outputs a /Si (H) signal for a fixed time as shown by waveform C in FIG. In this way, this /'-I signal is output for a certain period of time, so as the rotation speed increases, the amount of crank angle advance per unit time increases, so the output crank angle range of the /'-I signal increases, and the (46), (47), (in Figure 4)
This is the range surrounded by N3). Furthermore, the first constant time circuit 21 is set upon receiving the output falling signal (the rising edge/elbow pulse of waveform B in FIG. 5) from the constant angle circuit 20, and is set as shown by the waveform in FIG. Outputs a noi (H) signal for a fixed period of time. In this case as well, since the high signal is for a fixed time, the high signal from the time when the output of the constant angle circuit 20 falls ((48)-(49) in Fig. 4) as the rotation speed increases. The output crank angle range is larger and therefore the 4th
This is the range surrounded by (48), (49), and (51) in the equation.

These constant angle circuits 20. When the high (H) signals of the first constant time circuit 21 and the second constant time circuit 22 are ORed by the first converter/# regulator 28, (46
) , (47) , (53) , (43) ,
The range surrounded by (48) becomes a high (H) signal.

Therefore, the output signal of the advance angle circuit 19 is
When controlled by the signal from the armature regulator 28, the fall of the output signal of the first comparator 28, that is, (41),
At the time of (43) and (44), 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 r-to of the thyristor, which is the conductor switching element 7. . Therefore, the moment the transistor 23 is turned on becomes the ignition timing. Therefore, (5) in FIG. 4 due to the second angle signal
2) When the signal at -(45) and the signal from transistor 23 are combined, the ignition timing characteristic becomes (52) in Figure 4.
, (40), (41).

(43), (44), and (45).

In the above explanation of the operation, it has been explained that the circuit operates from the engine rotation speed of 0, but in reality, the circuit does not operate below the circuit operation starting rotation speed (for example, N1 rotation in FIG. 4). However, in terms of circuit operation, as can be seen from the control of the advance angle circuit 19 output based on the signal from the first converter/controller 2B, the output of the first converter/controller 28 during the rotation speed below Ns. Even if the transistor 23 is in the on state when the transistor 23 is low (L), 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.

In this case, the ignition timing characteristics will be as shown in FIG. 7. Furthermore, when the selection means 26 of the ignition timing calculation circuit 18 is connected to the terminals B, B' and C, C' as shown in FIG. 8, the ignition timing characteristics are as shown in FIG. 9. It will look like the figure.

In this way, by providing the selection means 26 in the ignition timing calculation circuit 18 and changing the connection of the terminals of this selection means 26, the ignition timing characteristics of each stock can be obtained. That is, for example, when the ignition timing characteristic is to correspond to an engine whose ignition timing characteristic is preferably /4 turn as shown in FIG. It is sufficient to manufacture an ignition timing control device to which the ignition timing control device is connected.

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 with 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. Figure 5 is a waveform diagram showing the output waveforms of the constant angle circuit, the first constant time circuit, and the second constant time circuit in the ignition timing calculation circuit, and the sixth wave is the ignition timing shown in Figure 4. 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 characteristics, and FIG. 7 is based on the ignition timing calculation circuit shown in FIG. 6. The eighth factor in the characteristic diagram showing the ignition timing characteristics is an ignition timing calculation circuit in which the wiring of the selection means is changed in order to obtain further ignition timing characteristics different from the ignition timing characteristics shown in FIGS. 4 and 7, respectively. A circuit diagram similar to FIG. 3 shown in FIG.
This figure is a characteristic diagram showing ignition timing characteristics based on the ignition timing calculation circuit shown in FIG. 8. 1... Engine ignition circuit, 6... Engine ignition! Rag, 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 fixed time circuit, 23...Transostor,
26...Selection means.

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 during a certain angle range of the crank with reference to the first angle signal, and a signal that operates based on the first angle signal or a signal from the constant angle circuit for a certain period of time; a plurality of fixed-time circuits that output a plurality of constant-time circuits; a selection means for selectively combining signals from the fixed-angle circuit and the plurality of fixed-time circuits; an output signal from the advance angle circuit according to the output signals combined by the selection means; An ignition timing control device comprising a switching element that controls and supplies the ignition timing to the engine ignition circuit.