JPH01104978A - Ignitor for internal combustion engine - Google Patents

Abstract

PURPOSE:To suppress the generation of ignition spark during the reverse revolution of an engine by measuring the time width in the set or reset state of an FF circuit controlled by the output of a revolution sensor and prohibiting the set or reset over a prescribed time. CONSTITUTION:An FF circuit 6 is set and reset by the positive and negative waves (b) and (c) through the diodes 4 and 5 of a sensor 3 by the revolution of a rotor 1, and ignition is executed by a spark plug 9 through a transistor 7 and an ignition coil 8 by the H and L outputs of the Q output. The time width of the set or reset state of this FF circuit 6 is measured by a detecting circuit 100, and if it is detected that the measured time is longer than a prescribed time, in other words, if the reverse revolution of the engine is detected, the turning-OFF of a transistor 28 is suppressed by the output of a comparator 27, and the setting or resetting of the OFF circuit 6 is prohibited. Therefore, the generation of ignition spark during the reverse revolution of the engine is suppressed, and the breakage of the engine can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an internal combustion engine ignition device that prevents the generation of ignition sparks when the engine is reversed.

[Conventional technology]

FIG. 5 is a circuit diagram showing a conventional internal combustion engine ignition system.
In the figure, a rotor 1 is driven in the direction of an arrow 2 by an engine (not shown), and has a predetermined protrusion 'f between A and B.

3 is installed facing the rotor 1, and the first .3 of the engine. This sensor detects the second crank angle position and is composed of a coil winding, a magnet, etc.

As shown in FIG. 6, this sensor 3 outputs a positive voltage, which is the first angle signal, when the front end A of the protrusion faces the sensor 3, and when the rear end 8 of the protrusion passes through the sensor 3. A negative voltage, which is a second angle signal, is output at each of the positions.

The anode of the diode 4 is connected to the output of the sensor 3, and the cathode thereof is connected to the set input terminal S of a seven-resolution circuit (hereinafter referred to as FF) 6.

The cathode of the diode 5 is connected to the output of the sensor 3, and the anode thereof is connected to the reset input terminal R of the FF 6.

Therefore, the positive wave of the output voltage of the sensor 3 passes through the diode 4t and enters the set input terminal S of the FF6.
FF6' is set to the set state, and the negative wave passes through five diodes and enters the reset input terminal R of FF6, setting FF6 to the reset state.

The pace terminal of transistor 7 receives the Q output of FF6,
Further, its collector terminal is connected to the primary winding of the ignition coil 8.

The other end of the primary winding of the ignition coil 8 is connected to the 10 terminal of the battery 10, and the secondary winding is connected to the ground (the negative potential of the battery 10) via the ignition Zolag 9.

FIG. 7 is an operation waveform diagram for explaining the operation of FIG. 5.
Fig. 7(a) shows the output voltage of sensor 3, Fig. 7(bl is F
The set input voltage of F6, Figure 7 [C] is the reset input voltage of FF6, Figure 7 (d) is the Q output voltage of FF'6, Figure 7 + e) is the collector voltage of transistor 7, Figure 7 (
f) shows each waveform of the secondary output voltage of the ignition coil 8.

Next, the operation will be explained. When the front end A of the protrusion faces the sensor 3 as the rotor 1 rotates in the direction of the arrow 2,
A positive voltage is generated in the sensor 3 as shown in Fig. 7 [a], and '
A pulse as shown in FIG. 7(b) is input to the set input terminal S of FF6, and therefore FF6 is set and the FF
The Q output terminal of No. 6 becomes high level as shown in FIG. 7(e).

Since the Q output of FF6 is at a high level, the transistor 7 is turned on (conducting), and the primary winding of the ignition coil 80 is connected to the tc shown in FIG.
) flows as shown below.

Furthermore, as the rotation of the rotor 1 progresses and the rear end 8 of the protrusion passes through the sensor 3, a negative voltage is generated in the sensor 3. , this FF6 is reset, and F
The Q output terminal of F6 becomes low level.

Since the Q output of FF6 is at a low level, the transistor 7 is turned off (cut off), and the primary winding current of the ignition coil 8 is cut off. A high voltage is generated and an ignition spark is obtained at the ignition plug 9.

Thereafter, the above operation is repeated periodically as the rotor 1 rotates as shown in FIG.

[Problem that the invention seeks to solve]

Since the conventional internal combustion engine ignition system is constructed as described above, the above operation is not inconvenient, but there are the following inconveniences when starting the engine.

In other words, if the rotation of the rotor 1 in the direction of the arrow 2 is expressed as normal rotation or normal rotation, and the rotation in the direction opposite to arrow 2 is expressed as reverse rotation or reverse rotation, then when the rotor 1 is in normal rotation, the above explanation is true. An output similar to that shown in FIG. 8 is generated from the sensor 3.

In this FIG. 8, t4 indicates that the front end A of the protrusion is the sensor 3.
ts indicates the output of the sensor 3 when the rear end 8 and the sensor 3 face each other.

On the other hand, when the rotor 1 is rotating in reverse, the output of the sensor 3 is as shown in FIG.
The output voltage polarity (positive wave or negative wave) is reversed (
f4a in FIG. 9 is the output of the sensor 3 when the rear end 8 passes through the sensor 3, and tsa is the output signal of the sensor 3 when the front end A passes through the sensor 3).

Therefore, if we consider the case where the A part of the rotor 1 faces the sensor 3 during normal rotation, and the case where the rotor 1 starts to reverse rotation and the A part is removed in the reverse direction before the 8th part of the rotor 1 is removed, the a in Figure 10 (Figure 10 fa).

d in Figure 10 (b), e in Figure 10 (cl), Figure 10 (
f in d) is the same as in FIG. 7 (Fl), FIG. 7 (d), FIG. 7 (e), and FIG. At time 1, a positive wave emitted from the sensor 3 turns on the transistor 7 as shown in FIG. 10 (bl), and a negative wave emitted from the sensor 3 at time 1 turns on the transistor 7 as shown in FIG.
is turned off, a secondary high voltage output is generated from the ignition coil 8 as shown in FIG. 10(d), and an ignition spark is generated at the ignition plug 9.

The ignition sparks emitted at part A of the rotor 1 further promote the complete rotation of the rotor 1.

As described above, there were problems such as the generation of ignition sparks during the second reversal, which could destroy the engine.

This invention has been made to solve the above-mentioned problems, and provides a safe internal combustion engine ignition device that prevents the generation of ignition sparks when the engine is reversed, prevents the engine from being destroyed, and provides a safe internal combustion engine ignition device. purpose.

[Means to solve all problems]

The internal combustion ignition device according to the present invention includes a detection circuit that measures the duration of a set or reset state of a flip-flop circuit controlled by the output of a sensor, and detects that this measured time has become longer than a predetermined time. , and a prohibition circuit that either resets the entire flip-flop circuit or does not allow it to be set, depending on the detection output of the detection circuit.

[For production]

The measurement time of the set or reset state of the 1-shift flip-flop circuit in the detection circuit according to the present invention is a predetermined time J.
When it is detected that the length has become longer than , the prohibition circuit acts to prevent the transistor that turns on and off the ignition coil from turning off, thereby preventing the generation of ignition sparks.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, when explaining the configuration, parts that are the same as those in FIG. Avoiding A, I will describe the parts and all subjects that are different from those in Figure 5.

In this FIG. 1, the parts indicated by numerals 1 to 10 are the same as those in FIG. 5, and the parts indicated after numeral 21 are newly added to the configuration of FIG. This is a characteristic feature of the embodiment.

In other words, 21 is an inverter that measures the Q output of FF6 and inverts its phase, and its output is connected to transistor 2.
I'm trying to send it to page 2.

A resistor 23 is connected between the terminal (G) of the battery 10 and the collector of the transistor 22.

A capacitor 24 is connected between the collector of the transistor 22 and the ground, and together with the resistor 23 forms a time constant circuit.

Resistors 25 and 26 are connected in series between the (-)-1 terminal of the battery 10 and the ground, and the connection point of the resistors 25 and 26 is at a predetermined voltage level.

27 is a comparator, whose input terminal is connected to the collector of the transistor 22, and whose input terminal is connected to the connection point between the resistors 25 and 26, and the capacitor 2.
The charging voltage level of the capacitor 24 is compared with the voltage level of the connection point of the resistor 25 and 26, and when the charging voltage level of the capacitor 24 is higher, the output is inverted.

Thus, inverter 21, transistor 22, resistor 2
3. Capacitor 24, Resistor 25.26, Comparator 2
7 and Ishi detection circuit 100? It consists of

28 is a transistor whose emitter is connected to the terminal of the battery 10, its pace is connected to the output terminal of the comparator 27, and its collector is connected to the reset input terminal R of the FF 6, and is turned on and off according to the output state of the comparator 27.
It turns off and forms a prohibition circuit that prohibits setting or resetting of FF6.

Next, the operation will be explained. Figure 2 is an operation waveform diagram for explaining the operation of Figure 1.
Figure 2(d) inhibits the signals a-d t- of Figure 1, and Figures 2(e) to 2(i) inhibit the signals G, 1. H,J
2(i) and 2(jl indicate the signals e and ft- in FIG. 1, respectively).

That is, the signal G in FIG. 2(C) is the output voltage of the inverter 21, and the signal H in FIG. 2(g) is the output voltage of the comparator 27 (
c) Input terminal voltage, signal I in FIG. 2(h) indicates the input terminal voltage of the comparator 27; signal J in FIG. 2(h) indicates the output voltage of the comparator 27.

Now, at time tlG, the positive wave shown in Fig. 2 (al) is emitted from the sensor 3, and the signal shown in Fig. 2 (b) is applied to the set input terminal S of FF6. The Q output becomes high level as shown in FIG. 2(d) and the transistor 7 is turned on, and the signal e shown in FIG. Current begins to flow.

Also, at time tlG, the output G of the inverter 21 is
falls to low level as shown in e), and the transistor 22
is turned off, a charging current flows to the capacitor 24 through the resistor 23, and the capacitor 24 is turned off as shown in Fig. 2 (g).
The voltage at terminal 4 begins to rise.

Until time tll, the terminal voltage of the capacitor 24 continues to rise, but it does not reach the voltage level shown in Fig. 2 (h), so the output J of the comparator 27 (Fig. 2 (h)) remains at a high level. Therefore, transistor 2
8 remains off.

Therefore, the negative wave of the sensor 3 emitted at time tll passes through the diode 5t-, and the signal C shown in FIG. 2(C) becomes FF.
6's reset input terminal 4, FF6 is reset, its Q output falls to low level, transistor 7 is turned off, the ignition coil 80 primary winding is cut off, and an ignition spark is generated at the ignition plug 9. do.

As mentioned above, charging of the capacitor 24 is started by the positive wave of the sensor 3 at the time t12, and at the time t13, before the next negative wave output of the sensor 3 is generated, the voltage level of the (G) input terminal of the converter 7 is reached. Then, comparator 27
Since the output of is inverted and falls to a low level, the transistor 28, which had been kept off until then, turns on, raising the potential of the reset input terminal R of the FF6 to a high level.

Therefore, after that, at time t14, a negative wave output voltage is emitted from the sensor 3, but it cannot reach the reset input terminal R of the FF6, and the Q output of the FF6 continues to be in the set state, that is, at a high level.

Therefore, the transistor 7 that was turned on at time t12 continues to be turned on even after time tlA, and no ignition spark is produced in the spark plug 9 at time t14.

Here, since the time span from time tZ2 to tlg is the time until the terminal voltage of the capacitor 24 reaches the predetermined voltage level, the capacitor 24 is busy.

The desired time width can be set by adjusting the values of the resistors 23, 25, and 26 appropriately.

On the other hand, part B of the rotor 1 is the ignition position when the rotor 1 rotates normally, so in terms of engine crank angle, it is approximately 10 degrees from compression top dead center to before compression top dead center.

Therefore, as shown in FIG. 10, after the part A of the rotor 1 faces the sensor 3 in normal rotation at time tl, the angular position at which the rotor 1 switches from normal rotation to reverse rotation at time t3 is p-1.
There is a high possibility that it is close to part B.

The reason for this is that the closer the part B of the rotor 1 is, the higher the compression pressure of the bridge becomes.9, and the reaction torque caused by this compression pressure causes the reversal of Iso IA, which is the problem here.

Therefore, the time span from time tl to 12 is usually longer than the time span from time t4 to time 1, which occurs when the rotor rotates forward as shown in FIG.

Therefore, it is practically possible to set the comparator 27 so that it does not operate when the rotor 1 rotates in the normal direction, and to operate when the rotor 1 rotates in the reverse direction.

FIG. 3 is a circuit diagram showing a second embodiment of the invention.

In FIG. 3, 31 is a starter for starting an engine (not shown), and 32 is a connection between this starter and the battery 10 (
A switch 33 is provided between the -@ terminals to continue energizing the starter, and an inverter is connected to the connection point between the starter 31 and the switch 32, and generates an output voltage that is inverted with respect to the input voltage. The switch 32 and the inverter 33 are a determining means 200 that determines whether or not the starter 31 is energized.
It consists of

An inverter 34 is connected to the output terminal of the comparator 27 and generates an output voltage that is inverted with respect to the input voltage.

Reference numeral 35 is a two-man powered Nant gate, which is connected such that the output of the inverter 34 is input to the first input terminal, and the output of the inverter 33 is input to the second input terminal.
The output becomes low level only when the second inputs are both high level, and under other input conditions, the output is normal. Further, the output of the Nant gate 35 is connected to the pace of the transistor 28.

The rest of the configuration is the same as that in FIG. 1, and a description of the configuration will be omitted.

Next, the operation will be explained. Figure 4 is an operation waveform diagram for explaining the operation of Figure 3, and Figures 4(a) to 4fh.
) are the same as FIGS. 3(a) to 3(h).

Furthermore, the signal in FIG. 4(j) includes the output voltage of the inverter 34, FIG. The signal K) shows the voltage of the starter 31, the signal M shown in FIG. 4 shows the output voltage of the inverter 33, and the signal N shown in FIG. Figure 4 tn+ and Figure 4 (0) are respectively Figure 2 fi.
), the same as Fig. 2(j).

Now, from time txt, the terminal voltage of capacitor 24 is 4th.
As shown in FIG. 4(g), at the beginning of the rise, the inverted level of the comparator 27 is reached at time t22 (FIG. 4fh)), and the output of the converter 27 drops from high level to low level.

Therefore, at time tZM, the output K of the inverter 34 (the fourth
Figure (j)) rises to a high level, but at this time the switch 32 is closed, so the terminal voltage of the starter 31 is at a high level, and IIIM of the inverter 33 (Figure 4 (1)) is low. Level, output N of Nando Kate 35 (
While FIG. 4(b) is at a high level, the output N of the Nant gate 35 does not change and remains at a high level.

>'C Therefore, since the transistor 28 also remains off, the negative wave output voltage of the sensor 3 generated at the subsequent time tzs reaches the reset input terminal R of the FF6 and resets the FF6, so its Q The output drops from high rail to low level, transistor 7 turns off, and the spark plug 9V
c An ignition spark appears.

At time t24, the switch 22 changes from closed to open, in other words, it is determined that the starter 31 is energized. After that, charging starts from time hs, and when the terminal voltage H of the capacitor 24 exceeds the comparison level voltage at the time tza, the output voltage J of the comparator 27 drops to a low level, and the output voltage K of the inverter 34 goes to a high level. Go up.

At this time, unlike at time tzz, inverter 3
Since the output voltage M of the Nandt gate 35 is also at a high level, the output voltage M of the first. Both second input terminals become high level.

Therefore, at time hs, the output of the Nandt gate 35 becomes a low rail, and the transistor 28 is turned on for the first time. Since the transistor 28 is turned on, the reset input terminal R of the FF6 is raised to a high level, and then the negative wave output emitted from the sensor 3 at the time by can reach the reset input terminal R of the FF6. , time t
At xt, FF6 remains set.

As a result, no ignition spark is produced at the spark plug 9. In the embodiment shown in FIG. 3, when the starter 31 is energized, the starter 31
Because of the driving force from
The embodiment of FIG. 1 is further improved based on the fact that reverse rotation of the engine is likely to occur when no current is applied.

〔Effect of the invention〕

As described above, according to the present invention, the rotor rotated by the engine is detected by the sensor, and the detection circuit measures the duration of the set or reset state of the FF driven by the output of the sensor, and the measurement is performed at a predetermined time. When the time is exceeded, the prohibition circuit prevents FFk from being reset or set, and the ignition spark is not emitted when the engine is reversed.
This has the effect of providing a safe internal combustion engine ignition system that does not destroy the engine.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an internal combustion engine ignition system according to an embodiment of the present invention, FIG. 2 is an operation waveform diagram for explaining the entire operation of the embodiment of FIG. 1, and FIG. 4 is an operation waveform diagram for explaining the operation of the embodiment shown in FIG. 3, FIG. 5 is a circuit diagram of a conventional internal combustion engine ignition system, and FIG. 6 is a diagram showing the operation of the embodiment shown in FIG. A waveform diagram showing the output of the sensor when the rotor rotates once in the internal combustion engine ignition system, Figure 7 is an operation waveform diagram to explain the operation of Figure 5, and Figure 8 shows the output of the sensor when the same rotor rotates in the normal direction. FIG. 9 is a waveform diagram showing the output of the sensor when the rotor is reversed, and FIG. 10 is a waveform diagram for explaining the spark generation situation in the internal combustion '8A related ignition system shown in FIG. 6 when the engine is reversed. It is an operation waveform diagram. 1... Rotor %3... Sensor, 6... Flip-flop circuit, 7,22.28... Transistor, 8...
...Ignition coil, 24...Capacitor, 27...Comparator, 100...Detection circuit. Note that the same symbols in the table indicate the same or equivalent parts. Agent: Masu Oiwa Tsugirod Figure 2 Figure 4 Figure 5 Figure 70 Figure 8 A-end opposed forward rotation of the rotor Figure 10 Procedural amendment (voluntary) 1. Indication of the incident: Patent Application No. 1983-259930 2,
Name of the invention: Internal combustion engine ignition system 3, relationship to the amended case Patent applicant address: 2-2-3 Marunouchi, Chiyoda-ku, Tokyo. Name (601) Mitsubishi Electric Corporation Representative Moriya Shiki 4, Agent name (7375) Patent attorney Masuo Oiwa (31! Contact number 03 (213) 3421 Patent Department) 5, Detailed information on the invention in the specification to be amended. Columns 6 for explanation and brief explanation of drawings
, Contents of the amendment (1) Change “as in (C)” in the second line of page 5 of the specification to “(
d)”. (2) Delete "as shown in Figure 7 (C)" on page 5, line 5. (3) On page 6, line 15, "when passing through 3" is corrected to "when facing 3". (4) Correct "as shown in Figure 10 (b)" in the 7th true 5th line to "as shown in Figure 10 (C)". (5) On page 10, line 13, “Signals a - d are prohibited;
" is corrected to "indicates signal a % d,". (6) From line 13 on page 10 to line 144 on the same page, "Fig. 2(e) to 2(i)" is replaced with "Fig. 2(e) to 2(i)"
(b) is corrected. (7) Page 122, line 1: “Reaching input terminal 4,
j is corrected as "reaching the input end character R". (8) "The primary winding is cut off" from the third line to the fourth line of the same page on page 122 is corrected to "the primary current is cut off."1'9) On page 14, line 10, "connected to the connection point" is corrected to "connected to the connection point." 0[l] "(Figure 4 01)" on page 15, line 18 of the same
Delete J. 00 "Switch 22" on page 16, line 15 is corrected to "switch 32". 021 "Output voltage of inverter 32" from line 2 to line 3 of page 177 is corrected to "inverter 33" as "FIG. 10 is the same as in FIG. 5". 04 Correct as shown in the attached sheet in Figure 3. Q. Correct as shown in the attached sheet in Figure 4. 7. List of attached documents (1) At least one copy of each drawing that is a corrected version of Figure 3 and Figure 4 Figure 4

Claims (3)

[Claims] (1) A sensor that generates first and second angle signals corresponding to the first and second crank angles of the internal combustion engine, and a sensor that is set or reset by the first angle signal of this sensor and is set or reset by the second angle signal of the sensor. A set of a flip-flop circuit to be reset or set, a transistor that controls the primary current of the ignition coil based on the output of the flip-flop circuit and performs an ignition operation based on the second angle signal, and the flip-flop circuit, or A detection circuit that measures the duration of the reset state and detects when the measured time has become longer than a predetermined time, and a circuit that resets or prevents the flip-flop circuit from being set in accordance with the detection output of this detection circuit. Internal combustion engine ignition system. (2) The detection circuit comprises a capacitor that is charged and discharged according to the output state of the flip-flop circuit, and a comparator that compares the charging voltage of the capacitor with a predetermined voltage level. Internal combustion engine ignition system as described in . (3) The detection circuit includes a capacitor that is charged and discharged according to the output of the flip-flop circuit, a comparator that compares the charging and discharging voltage of this capacitor with a predetermined voltage level, a starter that starts the internal combustion engine, and a starter that starts the internal combustion engine. Claim 1, characterized in that it comprises a discriminating means for discriminating whether there is an energized state, and a logic circuit that performs logical processing on the output of the discriminating means and the output of the comparator.
Internal combustion engine ignition system as described in .