JPS6050273A - Method and apparatus for ignition of internal- combustion engine - Google Patents

Abstract

PURPOSE:To prevent ignition energy in high speed rotation from reduction by igniting alternatively in each cylinder during each ignition timing of an engine when the ignition is carried out by a plurality of coils. CONSTITUTION:Ignition distributing signals D, D' are same in the median and low speed of an engine and ignite ignition coils 3a, 3b simultaneously in the same cylinders. In the high speed of the engine the ignition change-over signal C divides the frequency of the ignition signal A' to supply the ignition distributing signal D to a power switching element 6a and the ignition distributing signal D' reversed from this distributing signal D to a power switching element 6b. Thus, the ignition coils 3a, 3b are ignited alternatively to provide sufficient primary energizing current for the ignition coil over the whole rotational frequency of the engine.

Description

[Detailed description of the invention] This invention relates to an internal combustion engine ignition method and device.

Conventionally, the internal combustion engine ignition method using two ignition coils is as follows:
Nippondenso Public Technical Report 30-4, 30-5,
30-6, 30-75, etc., but in both of these, two ignition coils are activated simultaneously for each cylinder of an internal combustion engine, or ignition is performed at a time difference. Since two ignition coils are always operated for each cylinder, when the internal combustion engine rotates at high speed, the time per period of the ignition signal is inversely proportional to the rotation speed, so the ignition coil has a short energization time. There is a problem in that the breaking current value of the winding decreases, making it impossible to supply sufficient ignition energy to the internal combustion engine.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an ignition method and device that can supply sufficient ignition energy to an internal combustion engine even during high-speed rotation. It is something to do.

According to the present invention, the ignition coil's primary winding has a sufficient energization time or cut-off current value, such as when the engine rotates at medium to low speeds (depending on the battery voltage, engine speed, etc.). In order to increase the ignition energy for each ignition signal, the ignition energy of each ignition signal can be increased by either igniting two ignition coils simultaneously for each cylinder, or by slightly shifting the ignition timing of the two ignition coils to perform staggered ignition. Fuel ratio (A/F
') leaner system and Ogame's exhaust gas recirculation (Oenpo R)
5000~6000R of the engine.
．． P. A method is provided in which two or more ignition coils are operated alternately for each cylinder during high-speed rotations of M or higher, which ensures approximately twice the energization time m of the ignition coil as in the conventional method, and reduces the cut-off current value. This prevents a decrease in

Hereinafter, the method of the present invention will be described with reference to embodiments shown in the drawings.

FIGS. 1 and 2 are a block diagram showing the entirety of a first embodiment of the apparatus for carrying out the method of the present invention, and signal waveform diagrams of each part.

3 and 4 are detailed circuit diagrams of the ignition signal switching circuit 7 shown in FIG. 1, and signal waveform diagrams of each part thereof.

5 and 6 are a circuit diagram and a signal waveform diagram of the ignition control circuit 8 for controlling the energization time of the ignition coil shown in FIG. 1.

#! 7 and 8 are circuit diagrams of an ignition mode switching signal generation circuit that generates the ignition mode switching signal (CONT) shown in FIG. 1, and signal waveform diagrams of each part thereof.

Like numbers in FIGS. 1-8 represent like circuits, elements, and signals.

In FIGS. 1 and 2, 1 is a battery, 2 is a key switch, 3a and 3b are ignition coils, and 4a and 4b are ignition signal generators and cylinder discrimination signals that generate an ignition signal A and a cylinder discrimination signal B, respectively. A generator generates both the signals A,
The signal is input to the BFi point large signal switching circuit 7. The ignition signal switching circuit 7 outputs the ignition switching signal C and control signal H determined by the ignition signal ASS, the sieve tube discrimination signal, and the ignition mode switching signal CONT to the ignition control circuit 8. This ignition control circuit 8 receives an ignition switching signal 01, a control signal H, and an ignition coil/L.
/3a, 3b primary winding current signals E, F:' are received,
It determines the energization time of the primary current of the ignition coils 1v3a, 31) and generates ignition distribution signals D1 and D'. 5a
, 5b is a high r# voltage diode (avalanche diode), which is integrally formed in the rotor of the distribeater 9, the ignition coils 3a, 3b, or the connection between the ignition coils 3a, 3b and the rotor. . 10a,l
Qt) represents a primary winding current detection resistor of the ignition coils v3a, 3b, and ll represents a spark plug. l2 is the ignition carp〃3a,
This is an ignition mode switching signal generation circuit that generates an ignition mode switching signal CONT when the breaking current value of the primary winding 3b becomes equal to or less than a predetermined value.

As shown in FIG. 2, the operation of the device shown in FIG.
D' is the same signal and causes the ignition coils 3a and 3b to fire simultaneously for the same cylinder. On the other hand, when the engine is rotating at high speed in ignition mode M2, the ignition switching signal C is changed to the ignition signal A'
Point (6): Supply the fire distribution signal to the power switching element 6a,
An ignition distribution signal D' which is an inversion of this distribution signal is supplied to the power switching element 6b. And ignition carp A/
3a and 3b are ignited in alternation (two-phase alternation). Therefore, the ignition coil 3a is
, 3b can be passed through the primary windings for a sufficient period of time, thereby ensuring the necessary ignition performance.

In Figure 3, 71 a, 71 j), 7I
Q is 7-nd circuit # 72a, 72b, 72 (3, 72
dti by 77 and waveform shaping circuit, 73 is an OR circuit,
74 is a D-type flip-flop (hereinafter referred to as DF/F), 75 is a T-type flip-flop (hereinafter referred to as TF/F), and 76 is a monostable multi-circuit. FIG. 4 shows waveforms of various parts of the circuit shown in FIG. 3, and the ignition mode switching signal C0NT is switched in the center of FIG. The operation of the circuit shown in FIG. 3 is as follows.

Ignition signals A and B synchronized with the internal combustion engine are waveform-shaped,
In the AND circuit 711), the ignition signals A' and B' are ANDed, and the sampling pulse signal F is created. The multi-circuit 76 operates and outputs a reset signal R.Then, this reset signal R causes the TF/F 75 to
to be reset for a short time. Thereafter, TF/1'i' 75 frequency-divides the ignition signal R to obtain a divided signal G. On the other hand, the ignition mode switching signal C0NT is input to the D F/F 74 via the waveform shaping circuit 720. D F/F 74 is
When the ignition signal B' rises, the ignition mode switching signal 0ONT is sampled, and the output terminal Q outputs control signals H and H to each other.

The terminals become inverted signals of the terminal Q. Therefore, the AND circuits 71a and 71c select whether the ignition switching signal C becomes the branch signal G or the ignition signal A'. When the ignition mode switching signal C0NT is at a low level, the ignition signal A' becomes the ignition switching signal C, and when the ignition mode switching signal 0ONT is at a high level, the branch signal G becomes the ignition switching signal C. In addition, the angle △θ in Fig. 4
shall be within 20c' of crank angle.

FIG. 5 shows details of the ignition control circuit 8 in FIG. 1, and FIG. 6 shows waveforms of each part thereof. In Figure 5,
In soa and sob, the closing angle control circuit q801 is a ramp wave generation circuit, and this ramp wave is controlled by the ignition switching signal C. 802 is a comparator; 8o3 is a frequency-current conversion circuit (hereinafter referred to as 24 circuits) that flows a current proportional to the frequency of the ignition switching signal fc corresponding to the engine speed;
09a, 8091), 8090°809C1, #l;t
) The transistors 810a, 810'b, and 810C are resistors, and 811a and 811b are capacitors.

Note that vCC is a terminal connected to a constant voltage power supply (not shown), and Vn is a terminal connected to a battery (not shown). 804 is a power switching element 6a
805 is a constant current circuit that controls the primary winding current of the ignition coil/L/3a to a predetermined value or less. 80
6a, 806b are ant circuits, 807 is an OR circuit, 80
8a and 808b indicate inverters.

Symbols J, L, C, D, E, M, K in Figure 5
The waveform of is shown in FIG. The operation of the circuit shown in FIG. 5 is as follows.

According to the ignition switching signal C, the half circuit 801 outputs the run wave J as a ramp wave (9). The wave height value 1 of the ramp wave J in FIG. 6 is set to be a constant value.

Engine speed and power switching elements 6a, 6b
A comparator 802 compares the voltage determined by the constant current control time (shown in FIG. 6) with the ramp wave J to obtain an ignition distribution signal. This ignition distribution signal is amplified by the drive circuit 804, and the power switching element 6a is
In addition, a primary winding current flows through the ignition coil/I/3a, and a primary winding current signal E corresponding to this current is generated. A constant current circuit 805 performs constant current control so that the negative winding current does not exceed a predetermined value. A constant current time width signal K that is at the front level during this constant current control is output from the constant current circuit 805, and a sawtooth control signal M is applied to both ends of the capacitor 811b by operating the transistor 809a. can get. The resistor 810a is a resistor for discharging the charge stored in the capacitor 8111)K. The capacitor 811a is charged to a constant voltage determined by the resistor 810c and the F/I conversion circuit 803.

(10) In other words, the basic energization time of the ignition coils A/3a, 3b is determined by the ramp wave J and the constant voltage signal K', whereas the constant current time width signal K, the ramp wave 1c
By correcting and feeding back the voltage that is the comparison level for the
It controls the energization time of l/3a and 3b.

7 and 8 are circuit diagrams showing details of the ignition mode switching signal generation circuit 12 shown in FIG. 1, and diagrams showing signal waveforms of each part of the circuit. This switching signal generation circuit 12 includes a comparator 121a.

121k), Invar 1' 124, Resistor 122a
, 122b.

1220,) transistors 123a, 123b, and D
It is composed of 125 p-wave flip-flops (D F/F ). The operation of this ignition mode switching signal generation circuit 12 is the following energization.

Timing T of sampling pulse signal F shown in FIG.
At step m, the outputs of the comparators 121a and 121b (7), which are introduced into the terminals of the D F/F 125 via the transistors 123a and 123b and the inverter 124, are sampled, and if - the next winding current signal - IE,
When ' is below the α level signal determined by the resistors 122a and 122b and the constant voltage power supply Vcc (when the breaking current value of the negative winding is below the predetermined value), D F/F 1
25, the state is maintained until the next sampling pulse signal F arrives.

Next, other embodiments will be described. In the first embodiment described above, the ignition energy is supplied to a single spark plug in each cylinder of the internal IPS engine using a high voltage diode. If the engine is equipped with a plug, do not use a high-voltage diode, but use a method such as a two-point ignition distribe that mechanically reduces the ignition voltage by 6d, allowing simultaneous two-point ignition when the engine is running at medium to low speeds. However, during high-speed rotation, a single-point ignition method using alternating ignition may be used.

A second embodiment in which the method of the present invention is applied to an ignition system for an eight-cylinder internal combustion engine is shown in FIG. This second embodiment is based on the first
In the circuit of the first embodiment shown in the figure, the configuration of the ignition mode switching signal generation circuit 12 is simplified, and the resistor 13a and Zener diode 131) are set to always generate the high level ignition mode switching signal C0NT. It is characterized by The operation of the ignition device according to this second embodiment is as follows:
All ignition modes are set to ignition mode M2, and the ignition coils/L'3a and 3b are always operated alternately. Although FIG. 9 shows an example of an 8-cylinder engine, as a third embodiment, an ignition system for a 6-cylinder internal combustion engine can be constructed in the same way by replacing the distributor 9 with one for a 6-cylinder engine. can.

The fourth embodiment will be explained based on FIGS. 10 to 14. FIG. 10 is a diagram showing the overall configuration of this fourth embodiment for applying the method of the present invention to an ignition system for a six-cylinder internal combustion engine, in which simultaneous ignition is performed as in the first embodiment during low speed rotation, During high-speed rotation, three ignition coils are arranged in alternation (three-phase alternation)/L'3at 3b.

This is for igniting 3C. Ignition signal switching circuit 7
, and the detailed circuit diagram of the ignition control circuit 8 are shown in the twelfth page, respectively.
It is shown in FIG. FIG. 1I is a waveform diagram for explaining the operation of the circuit shown in FIGS. 1θ and (13) and FIGS. 10 to 14, which will be described later.

In FIG. 10, the same reference numerals as in FIG. 1 representing the first embodiment indicate the same or equivalent parts. 3c is an ignition coil, 5C is a high voltage diode, 6c is a power switching element, and IOQ is a primary winding current detection resistor. 12th
In the figure, 71a to 71θ are AND circuits, 72a to 7
2d is a waveform shaping circuit or buffer T173 is an OR circuit, 7
4 is a D-type flip-flop, and 76 is a monostable multi-circuit. Reference numeral 77 denotes a 3-frequency divider counter circuit constructed of, for example, LSI Knee 5N7493 manufactured by Texan Instruments. 78 is a multiplexer circuit constructed of, for example, Texas Instruments IME, 5r-SN74155, or the like. The operation of the ignition signal switching circuit 7 shown in FIG. 12 is based on the ignition mode switching signal C0N.
When T is low level, ignition signal A' is ignition switching signal C
1, and the control signal H becomes low level. When the ignition mode switching signal C0NT is at a high level, the frequency division by 3 counter circuit 77 and the multiplexer circuit 78 cause (
14) The three-phase alternating ignition switching signals 01 to C8 shown in FIG. 11 appear on the output side, and the control signal H becomes high level.

In the ignition control circuit 8 shown in FIG. 13, 81 is a signal selection circuit, and the ignition mode is switched by the control signal H. When the control signal H is at a low level, only the ignition switching signal C1 is switched on.) 806a, 806
c, 806e and OR circuit 807a.

Each closing angle control circuit 80a, 801 via 807b
), 80C, and the power switching element 6a.

6b and 6c are operated simultaneously, and simultaneous ignition in ignition mode M1 is performed. When the control signal H is at a high level, the three-phase alternating ignition switching signals ct, at, and cs are connected to the closed angle control circuit via the ignition switching signals ct, at, and cs, respectively. 80a, 80b, and 800. Therefore, when the engine rotates at high speed, alternating ignition is performed in the ignition mode Ms+, and the object of the present invention can be achieved (see FIG. 11).

Note that the frequency divider circuit 77 and the multiplexer circuit 7
The detailed circuit of No. 8 is shown in FIG. 771a and 771b are OR circuits, and 781a to 781C are inverters.

Refer to Table 1 and Figure 11. The operation of the circuit is as shown in Table 1).
After the 3 frequency divider counter circuit 77 is reset by the reset signal R, the count advances to 2 and the output terminals Q, A, QI
When both + become high level, this counter circuit 77
is reset and frequency division by 3 is performed. This output X1. X2
is the input terminal 5IIDLECT of the multiplexer circuit 78
A and B, and the ignition switching signal Q11 is input to the output terminals IYQ, IYI, and IY2 as shown in Table 1 (to).
Low-level signals are sequentially output as Ce' and Cs', and high-level ignition switching signals Cx and 02. Cm is output.

In addition, in the fourth embodiment shown in FIGS. 1θ to 14, an ignition system for a six-cylinder internal combustion engine using three ignition coils has been described, but as a fifth embodiment, the ignition system shown in FIG. In the second* embodiment, the ignition switching signal C is further divided into 4
By creating phase-variable ignition distribution signals (Di to D4) and using four ignition coils, it is possible to create an ignition system for an eight-cylinder internal combustion engine that is compatible with high engine speeds.

The following Table 2 can be obtained by summing up the embodiments of the present invention described above.

Table 2 As shown in Table 2, the present invention can be used in an expanded manner depending on the number of cylinders and the nature of the internal combustion engine (constant alternating ignition type, high rotation compatible type).

Further, when the maximum energization time per ignition at the maximum rotation of the internal combustion engine is tabulated, the following Table 3 is obtained.

Table 3 As shown in Table 3, the maximum engine speed (120
00E? , P, M), the maximum energizing time between the ignition coil and the next winding is almost constant, and the components of each igniter (ignition signal switching circuit 7 and ignition control circuit 8) have similar configurations. (18) Therefore, the present invention has the advantage of being able to promote the standardization and standardization of ignition devices through the common use of parts.

Furthermore, the operation of the frequency dividing circuit, etc. in the ignition signal switching circuit 7 can be handled by software calculation processing using a microconbeater, etc., and if these software techniques are used,
It is possible to further standardize parts. If you use a micro converter, software calculation processing can be stored in firmware such as P-ROM, so changes to the engine characteristics and number of cylinders can be made using standardized hardware circuits and standard specifications. Ignition coil combination and P-ROM
As described above, the method of the present invention has the advantage that it can be handled by only changing the ignition coil.In the ignition system having at least two ignition coils, the method of the present invention constantly performs alternating ignition throughout the engine's medium to low speed rotation and high engine speed. Alternatively, simultaneous ignition or staggered ignition is performed when the engine rotates at medium to low speeds, and alternating ignition is performed in the high-speed range where the ignition coil's cut-off current value is not sufficient. It is an excellent engine that can supply sufficient ignition energy to the internal combustion engine and ensure that the engine ignites at high speeds. effective.

In order to carry out the method described above, the device of the present invention is provided with a high-point signal switching circuit, and this switching circuit has a function of dividing the frequency of the ignition signal, thereby operating the ignition coil alternately. This has the advantage of providing a simple device that can achieve the objectives of the invented method.

[Brief explanation of drawings]

1 to 8 are drawings showing a first embodiment of the device of the present invention, FIGS. 1 and 2 are block diagrams showing the whole and signal waveform diagrams of each part, and FIGS. 3 and 4. The figure is a detailed circuit diagram of the ignition signal switching circuit shown in Figure 1 and signal waveform diagrams of each part thereof. Figures 5 and 6 are circuit diagrams and signal waveform diagrams of the ignition control circuit shown in Figure 1. 7 and 8 are circuit diagrams of the ignition mode switching signal generation circuit shown in FIG. 1 and signal waveform diagrams of each part thereof. FIG. 9 is a circuit diagram illustrating a second embodiment of the device of the present invention. 1θ to 14 are drawings illustrating a fourth embodiment of the device of the present invention, and FIG. 10 is a circuit diagram showing the overall configuration of this fourth embodiment,
Fig. 11 shows the signal waveforms of each part and Figs.
Figure 12 is a circuit diagram of the ignition signal switching circuit in Figure 10, and Figure 13 is a waveform diagram for explaining Figure 14.
FIG. 14 is a circuit diagram of the ignition control circuit shown in the figure. FIG. 14 is a circuit diagram showing details of the main part of the middle path shown in FIG. 3a, 3b, 30-Single ignition carp A/, 4a,,
, ignition signal generator, 4b-filij discrimination signal Nao n,
sa I 5b, sa-high voltage diode e 5
a, 6'b I 00-=power switching element,
7--Ignition signal switching circuit, 8--Ignition control circuit (21)

Claims (5)

[Claims] (1) A method for igniting an internal combustion engine using at least two ignition coils, wherein the ignition coils are alternately operated to ignite cylinders of the engine at each ignition timing of the engine. How to ignite. (2) As long as the energization time or cut-off current value of the primary winding of the ignition coil is not insufficient during medium-low speed rotation of the engine, the ignition coil is ignited simultaneously or staggered in the cylinder at the ignition timing. 2. The internal combustion engine according to claim 1, wherein when the energization time or the cut-off current value is insufficient during high-speed rotation of the engine, the ignition coil is alternately ignited with respect to the cylinder. How to ignite. (3) Item 1, characterized in that the ignition coil is caused to alternately ignite by a point distribution signal obtained by frequency-dividing the ignition signal generated at the ignition timing according to the number of cylinders each time the engine rotates once. Or the internal combustion engine ignition method according to item 2. (4) at least two ignition coils; an ignition signal generator that generates an ignition signal in synchronization with the rotation of the internal combustion engine; a cylinder discrimination signal generator that generates a signal for a specific cylinder of the engine; an ignition mode switching signal generation circuit that generates a signal for setting or switching a mode; and an ignition signal switching circuit that generates an ignition switching signal and a control signal by combining the signal generation circuit and the signals of the two signal generators; , an ignition control circuit that supplies an ignition distribution signal to a power switching element inserted in a circuit in series with the primary winding of the ignition coil based on a signal from the ignition signal switching circuit, the ignition control circuit constantly alternating the ignition coil. An internal combustion engine ignition device characterized in that it performs an ignition operation, or performs a switching operation between simultaneous ignition, staggered ignition, and alternating ignition. (5) The internal combustion engine ignition device according to item 4, wherein the ignition signal switching circuit generates an ignition switching signal obtained by frequency-dividing the ignition signal of the ignition signal generator.