JPS6085258A - Igniter for internal-combustion engine - Google Patents

Abstract

PURPOSE:To prevent the occurrence of erroneous operations by modifying a cylinder discrimination signal with an ignition signal synchronous to the rotation of an engine and a cylinder discrimination signal having a period two times as large as that of the ignition signal and by controlling the excitation of an ignition coil by use of the logic with the ignition signal. CONSTITUTION:An ingnition signal sensor 1 generates an ignition signal A synchronous to the rotation of an engine, and a sensor 2 generates a cylinder dicrimination signal B having a period twice as large as that of the ignition signal. Using a data flip-flop 15, these two signals A, B are modified into a cylinder discrimination signal which alternates at the changing point of the ignition signal reference edge, and the excitation of an ignition coil 11 is controlled by using the logic with the ignition signal A. When the phase of the ignition signal is largely changed by an ignition timing control circuit 4, the phase of the cylinder discrimination signal changes accordingly to it, and the ignition signal is reliably distributed. In this way, a broad range of spark advance angle becomes available without causing any erroneous operation.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an ignition device for an internal combustion engine, and more particularly to an ignition device for an internal combustion engine that is useful when electronically controlling ignition timing. Furthermore, there is also a non-distribution type using one or more simultaneous ignition coils depending on the number of cylinders as shown in Japanese Patent Application Laid-open No. 55-37536, or a high-pressure type as shown in Japanese Patent Application Laid-Open No. 56-14861. The present invention relates to an ignition system for an internal combustion engine that is suitable for use in combination with a diode rotor distribution type that uses a diode and has a high-voltage guide built into a power distribution rotor.

(Prior Art) First, a conventional example will be explained with reference to FIG. In FIG. 1, 1 is an ignition signal sensor, for example, an electromagnetic pickup, and 2 is not a cylinder discrimination sensor, but is a position sensor using, for example, a ball effect element. 3 is a waveform shaping circuit that shapes the waveform of the ignition signal output; 4 is an ignition timing control circuit that electronically controls the ignition timing based on the ignition signal output; 5 and 6 are AND circuits;
Based on the output signal of the cylinder discrimination sensor 2, a distribution signal for distributing and operating each transistor 7 and 9 is generated. 8 and 10 are backflow blocking diodes,
11 is an ignition coil, and 12 is an ignition power distributor, which performs two-system power distribution using two high-voltage diodes 12a and 12b.

Next, the operation of the above configuration will be explained with reference to the operation waveform diagram shown in FIG. 2. In addition, in Fig. 2, (A) to (
Each waveform in E) shows each waveform of the portion with the same reference numeral in FIG.

First, considering the ignition timing control signal that is advanced by a predetermined angle as shown in the (C) waveform with respect to the ignition signal in the (A) waveform, the distribution signal obtained by logic with the cylinder discrimination signal shown in the (B) waveform is (D
) and (E) waveforms, it can be seen that malfunctions occur as shown in the areas surrounded by thin lines.

In other words, the ignition signal after controlling the ignition timing is the cylinder discrimination signal at an angle that includes the entire energized section within the range of each phase: θON
There is a problem in that the ignition timing can only be controlled within the range covered by the ignition timing, and beyond that the ignition timing will malfunction as described above.

(Object of the Invention) The present invention provides an ignition system that can expand the ignition timing control range and greatly improve engine performance by preventing the above-mentioned malfunctions, and can also prevent erroneous ignition in other cylinders. The purpose is to

(Embodiment) Next, an embodiment of the present invention will be described with reference to the electric circuit diagram shown in FIG. 3 and the operation waveform diagram shown in FIG. 4, tag and fbl.

In FIG. 3, parts with the same reference numerals as those in FIG. 1 indicate the same or equivalent parts. 13, for example, creates an analog voltage according to the output frequency of the ignition timing control signal, that is, the engine rotation speed, and when the rotation speed exceeds a predetermined value, "
0'', and generates a signal of "1" below a predetermined rotation speed, the F/V converter 13a and comparator 13b
It becomes more.

Next, 14 is an N07 circuit, and 15 is a data (D) flip-flop. 16 is a generous discrimination signal switching circuit, which connects NOT times 11816a and AND circuits 16b, 1
6c & OR circuit 16d. And 17
is a delay circuit, and 18 is a N07 circuit.

Next, the operation of the above configuration will be explained with reference to the operation waveform diagram shown in FIG. 4.

First, the case where the engine rotational speed is higher than the set rotational speed of the engine rotational speed detection circuit 13 will be described with reference to FIG. 4(b). In this case, since the output of the engine speed detection circuit 13 is "0", the AND of the cylinder discrimination signal switching circuit 16
The gate of circuit 16C is closed and replaced by AND circuit 1
Gate 6b is open. Incidentally, the output of the D flip-flop 15 has a waveform (D) shown in FIG. 4 1bl. That is, the output waveform of the cylinder discrimination sensor 2 shown in waveform (B) is different from the fall of the output waveform of the ignition timing control circuit 4 shown in waveform (C), that is, the rise of the clock pulse input (CP) of the D flip-flop 15. It's flipped every time. Therefore, even when the angle is significantly retarded as shown in the waveform (C) with respect to the waveform (A), the cylinder discrimination signal generating means using the D flip-flop 15 makes a distinction between the cylinder discrimination signals shown in FIG. 4 (E) and (F). As shown in the waveform, energization can be controlled without malfunction.

Next, Fig. 4 shows a case where the engine rotation speed is smaller than the set rotation speed of the engine rotation speed detection circuit 13, such as at the time of starting! a)
I will explain about it. For example, just after starting the engine (C
) D flip-flop 1 before the falling edge of the waveform is obtained.
If the Q output of No. 5 is 1" or "0", it is in an undefined state, and if this signal is used as it is as a cylinder discrimination signal, it will malfunction.

Therefore, by detecting that the engine rotation speed is low based on the output of the engine rotation speed detection circuit 13, and as a result, closing the gate of the AND circuit 16b of the cylinder discrimination signal switching circuit 16 and opening the gate of the AND circuit 16c instead. Since the signal from the cylinder discrimination signal generating means 2 is directly used as the cylinder discrimination signal to control the energization, there is no fear of malfunction.

In the embodiments described above, the ignition timing control circuit 4
The D flip-flop 15 is used as a means for generating a cylinder discrimination signal that receives two signals, the ignition signal which is the output of the ignition signal, and the output signal of the cylinder discrimination sensor 2, and is inverted at the falling change point of the ignition signal. Needless to say, the present invention is not limited to this, and the same effect can be obtained as long as it has an equivalent function, such as a master-slave flip-flop in J-.

In addition, in this embodiment, the rotation speed detection circuit 13 is used to detect the starting time as a method of responding to the starting time, but the starting state is not limited to this, and the starting state can be detected by, for example, a starting switch, a lubricating oil pressure switch, an intake negative pressure switch, etc. It goes without saying that similar effects can be expected by detection.

Furthermore, instead of the ignition timing control circuit 4 in this embodiment, a control device 19 using a microprocessor is used as shown in FIG.
In addition, it goes without saying that similar effects can be expected even with a configuration in which the engine speed detection signal 19b is manipulated, for example.

(Effects of the Invention) As described above, in the present invention, an ignition signal is generated in the ignition signal generation means in synchronization with the rotation of the engine, and a cylinder discrimination signal having a period twice that of the ignition signal is generated in the cylinder discrimination signal generation means. These two signals are manually processed by the cylinder discrimination signal generating means into a cylinder discrimination signal that switches at the change point of the reference edge of the ignition signal, and the logic between the output signal of the cylinder discrimination signal generating means and the ignition signal is Since the energization of the ignition coil is controlled by the engine, even if the phase of the ignition signal changes significantly due to ignition timing control, the phase of the cylinder discrimination signal changes accordingly, ensuring reliable distribution of the ignition signal. This has the excellent effect of being able to obtain a wide ignition advance angle range without malfunction.

Furthermore, depending on the engine operating state, when the engine is started, the energization of the ignition coil is controlled by logic between the signal of the cylinder discrimination signal generation means and the ignition signal instead of the cylinder discrimination signal generation means, so that the cylinder can be distinguished when the engine is started. Even when the output signal of the signal generating means is not determined, there is an excellent effect that erroneous ignition in another cylinder can be prevented.

[Brief explanation of drawings]

Figure 1 is an electric circuit diagram showing the conventional device, and Figure 2 is the electrical circuit diagram of the conventional device.
FIG. 3 is an electric circuit diagram showing an embodiment of the device of the present invention; FIG. 4 is a waveform diagram of each part to explain the operation of the above embodiment; FIG. FIG. 3 is an electric circuit diagram showing another embodiment of the inventive device. 1.3, 4.19... Ignition signal sensor forming ignition signal generation means, waveform shaping circuit 9 ignition timing control circuit, control device, 2... Cylinder discrimination sensor forming cylinder discrimination signal generation means, 5,6.18...AND circuit and NOT circuit constituting energization signal generating means, 11...Ignition coil,
13.16...An engine rotational speed detection circuit and a cylinder discrimination signal switching circuit that constitute cylinder discrimination signal selection means; 15...A data flip-flop that constitutes cylinder discrimination signal generation means. Representative Patent Attorney Takashi Okabe

Claims (1)

[Claims] An ignition signal generation means that generates an ignition signal synchronized with engine rotation, a cylinder discrimination signal generation means that generates a cylinder discrimination signal having twice the period of the engine rotation, and a standard deviation of the ignition signal using both signals as input. A cylinder discrimination signal generation means that reprocesses the cylinder discrimination signal to a cylinder discrimination signal that changes at the change point of the lottery, and an output signal of the cylinder discrimination signal generation means and an output signal of the cylinder discrimination signal generation means are input, and the cylinder discrimination signal is changed according to the engine operating state. 2
cylinder discrimination signal selection means for selecting and outputting one human power;
An ignition device for an internal combustion engine, comprising energization signal generation means for controlling the 3ffi current of the ignition coil by taking a logic between the output signal of the cylinder discrimination signal selection means and the ignition signal.