JPS62282166A - Ignition device for engine - Google Patents

Abstract

PURPOSE:To make an ignition device of a simple constitution and of low-cost by lessening the number of logic elements constituting a distribution circuit, and further making exclusive amplifiers for driving semiconductor elements for ignition unnecessary. CONSTITUTION:Having been input the first signal T and the second signal U and the output signal Z of an ignition timing calculating circuit, four kinds of voltage levels V, W, X, and Y which can be obtained by the combination in four ways while analog-adding either one of the first signal T and its inverted signal, and either one of the second signal U and its inverted signal are respec tively added to the input on one side of respective operational amplifiers 34 through 37 of distribution circuits provided for respective cylinders. Further, the signal Z' to which the output Z of an ignition timing calculating circuit outputting four cycles in one period of a signal generating means has been subjected to a level conversion is added to said operational amplifiers 34 through 37 provided for respective cylinders, so that semiconductor switching elements for direct ignition are driven by the outputs alpha through delta of these amplifiers to carry out the ignition of four cylinders.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] This invention provides an ignition system for a multi-cylinder engine such as a four-cylinder engine, in which the number of cylinders per revolution of the engine is The present invention relates to an ignition system for an engine that calculates ignition timing using a smaller number of ignition timing calculation circuits and distributes ignition signals to each cylinder in a number corresponding to the number of equally spaced cylinders.

[Conventional technology]

The cylinder distribution system in the conventional multi-cylinder ignition system is disclosed in Japanese Patent Application Laid-open No. 1983. -10232 Publication, JP-A-55-10056
No. 56-50263, JP-A-56-50263, etc.

Among these publications, for example, Japanese Patent Application Laid-Open No. 56-5026
In Publication No. 3, a rotor is rotated by an internal combustion engine, and position detection signals are generated by a plurality of sensors corresponding to the number of cylinders of the internal combustion engine due to the rotation of the rotor, and an ignition position control circuit is operated by the signals from these sensors. The output controls the conduction and cutoff of the switching element, and as the switching element turns on and off, current is passed through and cut off in multiple ignition coils corresponding to the number of cylinders in the engine, and ignition sparks are generated in the engine. , when the number n of multiple AND circuits corresponding to the number of ignition coils is an even number, a circuit is provided, and signals from multiple sensors are sequentially input to the input terminal of this flip-frog circuit. The output and the output of the ignition position control circuit are input to an AND circuit, and the output of the AND circuit drives the corresponding switching element.

[Problems to be Solved by the Invention] However, the methods disclosed in each of the above-mentioned publications use a large number of Ronok elements in the distribution circuit, and furthermore require an amplifier to drive the semiconductor switching element for ignition. However, there were drawbacks such as a complicated circuit configuration, a large number of parts, and high costs. This invention was made to solve these problems, and is a method for a multi-cylinder engine ignition system. The distribution circuit that distributes four equally spaced ignition signals calculated by the ignition calculation circuit, which is smaller than the number of cylinders per revolution of the engine, to each cylinder can be reduced, and the number of semiconductor elements for ignition can be reduced. To provide an engine ignition device that does not require a dedicated amplifier for driving, has a simple circuit configuration, and can be made at low cost.

[Means for solving problems]

The engine ignition system according to the present invention consists of two signal trains separated by 90 degrees, and includes two signal generating means in which these two signal trains are sequentially generated with a phase difference of 180', and a signal of the signal generating means. The reception is 1 in synchronization with 1 cycle of the signal of the signal generating means.
Signal synthesis means for outputting two signals: a signal T that repeats a high state at a rate of 80° and 180°, and a signal U that repeats a high state and a low state in synchronization with the signal T at a cycle that is half the cycle of this signal T. In response to the output of this signal synthesizing means, two combination signals of the signal T and the inverted signal of the signal T, and the signal U and this inverted signal U are respectively generated. D, four signals V and W are obtained by adding four combinations of signals T and U.

By generating signals X and Y and comparing each of these signals with the outputs of four ignition timing calculation circuits in one cycle of the signal generating means at 90' intervals using four operational amplifiers corresponding to each cylinder. A distribution circuit is provided in which the ignition signal is distributed four times in one period of the signal generating means corresponding to each cylinder, and the output of the operational amplifier directly drives the semiconductor switching element for ignition.

[Effect]

In this invention, the first signal T, the second signal U, and the output signal Z of the ignition timing calculation circuit are input, and one of the first signal T and its inverted signal 〒, and the second signal U and its inverted signal are inputted. Four types of voltages obtained by analog addition of one of 0 and 0 and 4 combinations are respectively applied to 10,000 inputs of the operational amplifier of the distribution circuit provided for each cylinder. The output Z of the ignition timing calculation circuit, which outputs four cycles in a period, is level-converted and the signal Z' is applied to an operational amplifier installed in each cylinder, and the output directly drives the semiconductor switching element for ignition, ignite.

〔Example〕

Embodiments of the engine ignition system of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing the configuration of one embodiment. In this Figure 1, ■.

Reference numeral 2 denotes a power generation coil, which is built into a magnet generator driven by an engine (not shown).

One end of the generating coil 1.2 is grounded, and a diode 3.4 is connected in parallel to the generating coils 1, 2, respectively. This diode 3.4 short-circuits a half cycle of the output of the generator coils 1 and 2 that does not contribute to ignition.

The voltage generated at the other ends of the generator coils 1 and 2 is connected to the diode 5.
, 6, and the capacitors 7 and 8 are charged with the rectified voltage. The rectified voltage of the diode 5 is passed through the thyristor 151 and L53'i to the ignition coil 191,
The voltage is applied to each of the 193 primary coils.

Similarly, the rectified voltage rectified by the diode 6 is passed through the thyristor 152 and 154 to the ignition coil 192°194.
The voltage is applied to each primary coil.

On the other hand, 9.10 is a signal coil, the signal coil 9 outputs the waveform PUL of the waveform diagram explained in FIG.
0 outputs waveform PU2, and these i-type PUL, PO2
are input to the interface circuit 11, where the waveforms are processed and outputted as waveforms T and U shown in FIG.

The waveform T is high for a 180'' period and low for another 180'' period in one cycle of the signal group output by the signal coils 9 and 10.

However, the waveform U is high in the 90° section, low in the 906 section, and low in the 90'' section in one cycle of the signal group output by the signal coil 9.10. During one cycle of the signal group to be output, it is high for 906 sections and low for 90'' sections.

The ignition timing calculation circuit 12 uses the output PU of the signal coils 9 and 10.
I, PU2' is input, and four ignition signals in one cycle of the signal group output by the signal coil 9-10, that is, the waveform Z shown in Fig. 4 (pupil) is output at the ignition timing of the 4-cylinder engine. . This signal 2 is sent to a distribution circuit 13.

The distribution circuit 13 is one of the features of the present invention, and the distribution circuit 13 has the above-mentioned waveforms 'f', U, Zt- manually inputted to the distribution circuit 13, and the distribution circuit 13 inputs the above-mentioned waveforms 'f', U, and Zt manually. Waveforms α and β shown.

It outputs γ and δ.

The output of this distribution circuit 13 is a waveform α, βl during one period of the signal group outputted from the signal coils 9 and 10 to each of the four cylinders.
An ignition signal is outputted to the ignition position corresponding to the ignition timing of each cylinder only once each rlδ.

Waveform α is the ignition signal output to the ignition position of this cylinder, waveform β is the ignition signal output to the ignition position of the next cylinder, and waveform γ is the ignition signal output to the ignition position of the next cylinder. The waveform δ is an ignition signal output to the ignition position of the next cylinder.

Waveforms α to δ correspond to resistors 111 to 114 and capacitors 121 to 124, respectively. The diodes 141 to 144 are all connected to the r-to of the thyristors 151 to 154.

Resistors LL1 to 114 are output limiting resistors of the distribution circuit 13, and are inserted to limit the ignition voltage from entering the distribution circuit 13, and to protect the circuit and prevent malfunction.

Capacitors 121-124 and resistors 131-134 are capacitor 121 and resistor 131. capacitor 122
and resistance 132. The capacitor f123 and the resistor 133, and the capacitor 124 and the resistor 134 constitute a differentiating circuit.

Diodes 141 to 144 rectify the output of the differentiating circuit. Resistors 161 to 164, which are bias resistances, are connected between the gates and cathodes of each thyristor 151 to 154, and a capacitor 171 is connected to prevent malfunctions caused by noise.
~174 are connected.

The thyristors 151 to 154 are provided corresponding to each cylinder, and the output α of the distribution circuit L3 corresponding to each cylinder.

It is triggered by the differentially rectified output of β, γ, and δ.

When the thyristors 151 to 154 arranged corresponding to each cylinder are triggered and conductive, the thyristors 151 and 153°15
The load of the capacitor 7.8 corresponding to 2 and 154 flows to the primary coil of the ignition coil 191-194 corresponding to each cylinder, and the load of the capacitor 7.8 corresponding to
A high voltage is generated in the next coil, sparks fly to the spark plugs 211 to 214 corresponding to each cylinder, and the engine is operated.

Doors 181-184 are ignition rods 191-194
On the other hand, a diode that bypasses the back electromotive force of the primary coil has the effect shown in Japanese Patent Publication No. 41-L49'21.

FIG. 2 shows the output waveform PUI of the signal coils 9 and 10.

PO2 and interface circuit I LO output T, U
FIG.

FIG. 3 shows details of the distribution circuit 13, which is a feature of the present invention. In FIG. 3, 14 is an inverting amplifier that inverts the output waveform T of the interface circuit L1.

Further, the inverting amplifier 15 inverts the output waveform U of the interface circuit 11.

Resistors 16-19 have -1 connected to the power supply, the other end connected to the inverting input terminal of operational amplifiers 34-37, and resistor 20
, 2 L is connected to the output T of the interface circuit 11.
is connected to the ratio output through the inverting amplifier 14, and the other is connected to the inverting input terminal of the operational amplifier 34, 35, and the resistor 22
．． 23 has -1 connected to the output of the interface circuit 11, the other is connected to the inverting input terminal of the operational amplifier 36.37, and the resistor 24.26 connects -1 to the output T of the interface circuit 11 through the inverting amplifier 15. output, the other is connected to the inverting input terminal of the operational amplifier 34.35, and the resistor 25.27 connects -1 to the interface circuit 11.
, and the other end is connected to the inverting input terminal of the operational amplifiers 35 and 37, the -1 end of the resistors 28 to 31 is connected to the inverting input terminal of the operational amplifiers 34 to 37, and the other end is grounded.

The -1 end of the resistor 32 is connected to the output 2 of the interface circuit 11, the other end is commonly connected to the non-inverting input terminals of the operational amplifiers 34 to 37, and the -1 end of the resistor 33 is connected to the operational amplifier 34.
.about.37 non-inverting input terminals, and the other terminal is grounded.

FIG. 4 shows the output T of the interface circuit 11.

Operational amplifier 34 of distribution circuit 13 corresponding to the output waveform of U
- Waveforms V, W, and X of each inverting input terminal of 37.

2 shows the waveform Z of the output of the ignition timing calculation circuit 12, the input waveform Z' common to each operational amplifier at the non-inverting input terminal of the operational amplifiers 34 to 37, the waveform α to δ of the output of the distribution circuit 13, and their phase relationships. It is a diagram.

FIG. 5 shows a waveform V at the inverting input terminal and a waveform 2 at the non-inverting input terminal of the operational amplifier 34 corresponding to one of the four cylinders in order to explain the operation of the distribution circuit 13 in this invention.
FIG. 3 is a diagram showing the relationship between phase and voltage between ' and the output waveform α.

Next, the operation will be explained. A half cycle of the electromagnetic power generated by a power generating coil 1 and a power generating coil 2 built in a magnet generator driven by the engine, which does not contribute to ignition of the engine, is short-circuited by diodes 3 and 4.

Of the power generation output generated by the power generation coils 2 and 3, a half cycle that contributes to engine ignition is rectified by each of the diodes 5 and 6. Each rectified rectified output charges a respective capacitor 7.8.

The light charged in each of these capacitors 7.8! Electric charge is generated at each ignition timing of the engine by the ignition semiconductor switching elements corresponding to each of the four cylinders of the engine, that is, each thyristor 151 to [
54 conducts, each ignition coil 19 corresponding to each cylinder
The primary coils 1 to 194 are energized, a high voltage is generated in each secondary coil, and each ignition grag 211 to 211 corresponds to each cylinder.
The fire spreads to 214.

Further, the outputs of the signal coils 9 and 10 generated in synchronization with the magnet generator driven by the engine are as shown in the waveform diagram of FIG.
Output waveform PU2 is output to 0.

The output waveform PUL outputs two pairs of positive and negative signal sequences including the first signal every 90 degrees, assuming that one revolution of the engine is 360 degrees. At first, the negative side signal lot is output, then the positive side signal 102 is output, and then the negative side signal 101090''
Afterwards, a negative side signal 103 is output, and then a positive side signal 104 is output.
is output.

Output waveform PU2 has a phase of 180° with respect to the above output waveform PUI.
The output waveforms are similar but different, and are composed of a negative side signal 201, a positive side signal 202, a negative side signal 203, and a positive side signal 204.

One of these signals is input to the interface circuit 11, and the other is input to the ignition timing calculation circuit 12. The interface circuit 11 receives these signal waveforms PUL.
, PUZ, the circuit is configured to output two output waveforms T and U.

These output waveforms are output waveform T and output waveform U. The output waveform T is a high output in a 180° section when one revolution of the engine is 360 degrees, and a low output in other sections, and changes from a low state to a high state in response to the output signal 101 of the waveform PUI. At the same time, it changes from a high state to a low state in response to the output signal 201 of waveform PU2.

In addition, the output waveform U is a high output in a 90° section when one rotation of the engine is 360°, and a low output in the next 90' section, and is in a low state corresponding to the output signal iot K of the waveform PUI. The output signal of waveform PU2 changes from a high state to a low state in response to the output signal 103 of the waveform PU1, and changes from a low state to a high state in response to the output signal 201 of the waveform PU2. 203, it changes from a high state to a low state.

The ignition timing calculation circuit 12 to which the waveform PUI and the waveform PU2 are input calculates the ignition timing from the signal group of the waveform PUL and the waveform PU2. Outputs output signal Z.

Next, regarding the distribution circuit, which is one of the features of this invention,
The explanation will be centered on FIGS. 3 to 5. The above-mentioned output signal T,
The distribution circuit 13 is configured to receive U as an input and output ignition signals α, β, γ, and δ for one revolution VCL of the engine corresponding to each of the four cylinders.

The signals T and U are respectively inverted via inverting amplifiers 14 and 15, resulting in respective inverted signals 〒 and U, which are connected to the inverting input terminal of the operational amplifier 340 via resistors 20 and 24, respectively, and connected to the resistor 16 from the power supply. and the resistance 28 from ground.

As a result, the combined signal becomes signal V. The waveform of signal V is shown in FIG. 4(c).

A signal Z is connected to the non-inverting input terminal of the operational amplifier 34 through the resistor 3.
2. A voltage-divided signal Z' is inputted to the resistor 33.

A signal α is output from the output of the operational amplifier 34 based on the constant signal Z' and the signals U and K input to the non-inverting input terminal and the inverting input terminal of the operational amplifier 34.

Next, the operation of the adder circuit composed of resistors 16, 20, 24, and 28 will be explained. Resistance 16, 20.

24. Let the resistance value of 26 be R, and input signal 〒, input signal U
If the high voltage is Vcc, which is the power supply voltage, and the low voltage is Ov, which is the ground voltage, and the power supply voltage is Vcc, the voltage of the signal V is an input signal, and it changes depending on the high or low state of the input signal 0. do.

First, when the input signal 〒 and the input signal 0 are both in the low state, the voltage of the signal V becomes (L/4) x Vcc, which is 1/4 of the power supply voltage.

However, when either the input signal 〒 or the input signal U is in a high state, the voltage of the signal V becomes ('/2)XVcc, which is 1/2 of the power supply voltage.

Furthermore, when the input signal 〒 and the input signal U are both in the high state, the voltage of the signal V becomes (3/4) x Vcc, which is 3/4 of the power supply voltage.

The waveform diagram of this signal V is shown in FIG. 4(c).
Details are shown in waveform V in FIG. The voltage vl r v3 + v4 of the waveform V in FIG.
) XvCC is the voltage V4, (1/2) x Vcc
corresponds to voltage V1, and (3/4)XVcc corresponds to voltage v4.

In this way, the voltage at the inverting input terminal of the operational amplifier 44 changes to three levels of voltage depending on the state of the signal and the signal 0.

10,000, signal Z' is input as the voltage of the non-inverting input terminal.

For the signal 2', the voltage of the signal Z is divided by a resistor 32 and a resistor 33, and the voltage of the signal Z is set to a voltage V which is larger than the voltage vl and a voltage V which is smaller than the voltage vl.

As a precaution, the output of operational amplifier 34 is such that signal V is equal to signal Z'
When it is smaller, one of the signals Z' is outputted to the output α.

In this way, only a signal corresponding to the ignition timing of one corresponding cylinder is outputted from the signal 2' for one revolution of the engine.

Since the output of the operational amplifier 34 has its own driving capability, the ignition semiconductor switching element, that is, the thyristor 151 can be entirely directly driven by this output.

Similarly, the output signal β of the operational amplifier 35 is inverted and amplified by the signal T, the signal ↑ is inverted by the width amplifier 14, and the waveform W shown in the waveform diagram of FIG. 4(d) is created by the signal U. It is produced by signal W and signal 2'.

Similarly, the output signal γ of the operational amplifier 36 is generated by the signal T and the signal U obtained by inverting the signal U by the inverting amplifier 15 to create the waveform X shown in the waveform diagram of FIG.
and signal Z'.

Similarly, the output signal δ of the operational amplifier 37 is formed by the signal T and the signal U to form a waveform Y shown in the waveform diagram of FIG. 4(f), and this signal Y and the signal Z'.

Output signals α and β of the distribution circuit 13 obtained in this way
t'rδ is differentiated by the capacitor 121 and the resistor 131, the capacitor 122 and the resistor 132, the capacitor 123 and the resistor 133, and the capacitor 124 and the resistor 134, which constitute the respective differentiating circuits via the limiting resistors 111 to 114, respectively. , diodes 141 to 14, respectively.
The thyristors 151 to 1 correspond to each cylinder.
54 is triggered at the ignition timing corresponding to each cylinder, and conduction occurs to ignite the engine.

〔Effect of the invention〕

As explained above, the present invention provides angle signals obtained from a group of angle signals spaced apart by 90 degrees from two first and second signal generating means.
A signal T that is in a high state for an 80° period and a low state for a 180° period, and an inverted signal of this signal T, are repeated at half the period of this signal T, and the signal T is in a high state for a 90° period in synchronization with the signal T. A circuit is provided to obtain a signal group of four signals T, U, 〒, U, which is a signal U which is in a low state for a 90° interval and this inverted signal U, and a circuit is provided to obtain a signal group of four signals T, U, 〒, U.
Of 〒, 0, signal 〒 and signal D, signal 〒 and signal U, signal T
Signals v, w, x, and y obtained by adding analog signals of four sets of signals, signal U, double signal, and signal U, respectively, are input to the inverting input terminals of operational amplifiers corresponding to the valley cylinders, and output from the ignition timing calculation circuit. The level-converted signal Z' is input to the non-inverting input terminal of the operational amplifier, the voltages are compared, and the ignition timing calculation circuit calculates one ignition signal at the ignition position corresponding to each cylinder from the four ignition signals per revolution. Since one element is obtained per rotation and distributed, the semiconductor switching element for ignition can be directly controlled by an operational amplifier corresponding to each cylinder, and it has the advantage of being simple and inexpensive as an ignition device for four cylinders.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of an actual example of the ignition system for the engine of this invention, Fig. 2 is a waveform diagram for explaining the operation of the ignition system for the engine of the invention, and Fig. 3 is the ignition system for the same engine. FIGS. 4 and 5 are waveform diagrams for explaining the operation of the distribution circuit, respectively. 1.2...Generating coil, 3-6, 141-144°181-184...Diode, 7.8.121-1
24゜171~174---Conden? , 9.10・-
・Signal=z Lu, 11・H interface circuit, 12・
-・Ignition timing calculation circuit, 13...-Distribution circuit, 34-3
7... Operational amplifier, 151-154... Thyristor, 191-194... Ignition coil. In addition, the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] First and second signal generating means that generate signals in synchronization with the rotation of the engine, and a cycle of the outputs of the first and second signal generating means using the outputs of the first and second signal generating means as inputs. A first signal that repeats a high state and a low state in intervals of 1/2 and 1/2 of one period with the same period as , and is synchronized with each signal of the first and second signal generating means, and this first signal. a circuit that repeats a high state and a low state in a period of 1/2 and 1/2 in the 1/2 period and outputs a second signal synchronized with the first signal; An ignition timing calculation circuit receives the output of the second signal generating means and outputs an ignition signal at an ignition timing corresponding to each cylinder of the engine, and the first signal is used as it is or is a signal corresponding to each cylinder of the multi-cylinder engine. The inverted signal and the second
An operational amplifier compares the output voltage corresponding to each cylinder of a multi-cylinder engine, which is obtained by adding the signal as it is or a signal after signal inversion processing, and the output voltage obtained by converting the output voltage of the ignition timing calculation circuit to the voltage level. An ignition device for an engine, comprising a distribution circuit for controlling semiconductor switching elements for ignition provided corresponding to each cylinder of a multi-cylinder engine.