JP3019602B2 - A rotation angle detection signal generation circuit for calculating the ignition timing of an internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine for generating a rotation angle detection signal for providing rotation angle information to an ignition timing calculation circuit of an ignition device for an internal combustion engine at a predetermined fixed rotation angle position of the internal combustion engine. The present invention relates to a rotation angle detection signal generation circuit for calculating an ignition timing of an engine.

[0002]

2. Description of the Related Art As an ignition timing calculation circuit for an ignition device for an internal combustion engine, an integration for charging an integration capacitor with a predetermined time constant is provided.
Using the integrated voltage generated by performing the operation
The one that calculates the ignition timing is widely used. In this type of ignition timing calculation circuit, an integration circuit that performs an integration operation in a fixed integration interval is provided for each rotation of the engine, and an integrated voltage obtained from the integration circuit is compared with a fixed reference voltage, or integrated. A plurality of integrating circuits having different sections and different integration constants are provided, and an advance voltage characteristic or a retarding characteristic is obtained by comparing integrated voltages obtained from these integrating circuits. In addition, in order to obtain a predetermined characteristic, the integration constant may be switched in the middle of the integration interval to change the slope of the integration voltage. Further, when the ignition timing is fixed in a specific rotation region (for example, a low speed region), a signal generated at a fixed position is required regardless of the rotation speed.

Therefore, in this type of ignition timing calculation circuit,
Starting position of the integration operation, end position and the switching position of the integral constant, in order to determine the ignition timing, etc. in a particular rotational region, the inner
A rotation angle detection signal for calculating an ignition timing generated at a rotation angle position that does not change depending on the rotation speed of the fuel engine is required.

In a conventional ignition device using this type of ignition timing arithmetic circuit, a maximum advance position and a maximum advance position (maximum retard position) respectively determined from a signal generator mounted on an internal combustion engine. A signal and a minimum advance position signal are generated, and the generation position of these signals is used as the start position or end position of the integration operation or the switching position of the gradient of the integration voltage. The maximum advance position signal and the minimum advance position signal can be obtained by appropriately setting the position and width of the reluctor provided on the rotor of the signal generator.

[0005]

In the case where the switching position of the integration section or the integration constant is determined by the maximum advance position signal and the minimum advance position signal obtained from the signal generator, the advance width or delay of the ignition timing is determined. The angular width is determined by the maximum advance position signal and the minimum advance position signal. Therefore, in the conventional ignition device in which the ignition timing is determined by the integral calculation, the advance width or the retard width is determined by the configuration of the signal generator, and the advance width or the retard width is determined on the circuit side of the ignition device. Cannot be set arbitrarily.

In order to arbitrarily set the advance angle width or the retard angle width on the circuit side of the ignition device, ignition is performed at a fixed rotation angle position (a rotation angle position that does not change depending on the rotation speed) that can be set by circuit constants. Although a signal generation circuit for generating a rotation angle detection signal for timing calculation control is required, it has not been proposed to calculate ignition timing using such a signal generation circuit.

SUMMARY OF THE INVENTION It is an object of the present invention to make it possible to arbitrarily set the advance or retard width of the ignition timing on the circuit side of the ignition device, or to determine the ignition timing in a specific rotation region. Therefore, it is an object of the present invention to provide a rotation angle detection signal generation circuit for calculating an ignition timing of an internal combustion engine that generates a rotation angle detection signal at a fixed position arbitrarily set by a circuit constant.

[0008]

SUMMARY OF THE INVENTION The present invention provides an integrated condenser.
To charge the battery with a predetermined time constant.
Calculation of ignition timing using the integrated voltage generated by
Integral operation in ignition timing calculation circuit of ignition system for fuel engine
Start position, end position, switching position of integration constant,
Ignition used to determine ignition timing, etc. in the rotation range
The rotation angle detection signal for timing calculation is converted to the rotation speed of the internal combustion engine.
The ignition timing generated at the rotation angle position that does not change
It relates to an arithmetic rotation angle detection signal generation circuit,
The signal generation circuit according to the present invention includes a first signal and a second signal having different polarities at a first rotation angle position of the internal combustion engine and a second rotation angle position having a phase delayed from the first rotation angle position. And a signal generator for generating a second signal and charging the first integration capacitor with a constant time constant from the generation of each second signal to the generation of the next second signal. Performs an integration operation to discharge the first integration capacitor instantaneously when the occurrence of
First integrating circuit and the first signal and the second of the second signal to charge the integrating capacitor at a fixed time constant until the second signal is generated from the occurrence to obtain an integration voltage A second integration circuit for performing an integration operation for instantaneously discharging the second integration capacitor when the second integration capacitor is obtained to obtain a second integration voltage across the second integration capacitor; 2
Second integrated voltage by comparing the integrated voltage of the is composed of a comparator for outputting a rotation angle detection signal for the ignition timing calculation when it is more than the first integrated voltage.

The signal generating circuit according to the present invention also includes a first rotation angle position of the internal combustion engine and a first rotation angle position different in polarity from the second rotation angle position having a phase delayed from the first rotation angle position. A signal generator for generating a signal and a second signal, and charging the first integration capacitor with a constant time constant between the generation of each first signal and the generation of the next first signal;
A first integration circuit that performs an integration operation for instantaneously discharging the first integration capacitor when each first signal is generated to obtain a first integration voltage across the first integration capacitor; The second integration capacitor is charged with a fixed time constant from the generation of the second signal to the generation of the next second signal, and the second integration is performed when each second signal is generated. A second integration circuit that performs an integration operation to discharge the capacitor instantaneously to obtain a second integration voltage across the second integration capacitor, and compares the first integration voltage with the second integration voltage to determine a second integration voltage. And a comparator that outputs a rotation angle detection signal for calculating an ignition timing when the integrated voltage of the second signal becomes equal to or higher than the first integrated voltage.

[0010]

In each of the above structures, the second integrated voltage is equal to the first integrated voltage.
Is determined by the integration constants of the first and second integration circuits and the angle from the first rotation angle position to the second rotation angle position, as described later. Becomes irrelevant. Therefore, depending on the number of revolutions of the engine
A rotation angle detection signal for calculating the ignition timing can be obtained at a rotation angle position that does not change, and the position where this signal is generated can be arbitrarily set by a circuit constant.

When the rotation angle detection signal can be generated at an arbitrary position which is not affected by the rotation speed,
By controlling the calculation of the ignition timing using the signal,
Since the advance width or the retard width can be set arbitrarily, and the ignition timing in a specific rotation region can be determined using the signal, the circuit constant can be changed without changing the signal generator. , Various ignition characteristics can be obtained.

[0012]

FIG. 1 shows an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a signal coil provided in a signal generator attached to an internal combustion engine. The signal generator includes a rotor having a reluctor, an iron core having a magnetic pole portion facing the rotor, a signal generator having a permanent magnet for flowing magnetic flux through the iron core, and a signal coil wound around the iron core. A known thing,
The polarity of the signal coil 1 is changed by the change in magnetic flux generated in the iron core of the signal generator when the rotor of the rotor starts facing the magnetic pole of the signal generator and when the retractor finishes facing the magnetic pole of the signal generator. Different pulsed first signal V
s1 and the second signal Vs2 are induced.

In the present invention, the position where the first signal Vs1 is generated is defined as a first rotational angle position, and the position where the second signal Vs2 is generated is defined as a second rotational angle position.

In the present invention, the “position where a signal is generated” means a position where the signal reaches a threshold level necessary for operating the circuit.

In FIG. 1, C1 and C2 are the first
And a second integrating capacitor, Co, an integrating power supply capacitor serving as a power supply for charging the second integrating capacitor; and 2, a reset circuit for discharging these capacitors instantaneously. The reset circuit 2 detects that the signal coil 1 has the second signal Vs2
A transistor Tr1 which is supplied with a base current through a diode D3 when the transistor Tr1 is turned on and conducts, and diodes Do to D2 respectively connected between the collector of the transistor and the non-ground side terminals of the capacitors Co to C2. When the second signal Vs2 is generated, the transistor Tr1 is turned on to discharge the capacitors Co to C2 instantaneously.

The integrating power supply capacitor Co has a PNP transistor T having a resistor R11 connected between an emitter and a base.
An output voltage E of a DC power supply (not shown) is applied through an emitter-collector circuit of r2. The base of the transistor Tr2 is connected to the collector of the transistor Tr3 whose emitter is grounded through a resistor R12.
Is connected to one end of the signal coil 1. The other end of the signal coil 1 is connected to the cathode of a diode D4 whose anode is grounded.
Occurs, the transistor Tr3 is turned on to allow a base current to flow through the transistor Tr2. In this example, the transistors Tr2 and Tr3, the resistors R11 and R12, and the diode D4 constitute a switch circuit for controlling the charging of the capacitor Co. When the first signal Vs1 is generated, the integrating power capacitor Co is charged almost immediately to the power supply voltage E through the switch circuit,
Is instantaneously discharged when the signal Vs2 is generated.

The output voltage E of the DC power supply is applied to the first integrating capacitor C1 through the diode D5 and the resistor R1. Therefore, the first integrating capacitor C1 is charged with a constant time constant through the diode D5 and the resistor R1 by the DC voltage E, and is discharged instantaneously when the second signal Vs2 is generated and the transistor Tr1 of the reset circuit 2 is turned on. I do. In this example, a first integration circuit is constituted by the first integration capacitor C1, the diode D5, the resistor R1, and the reset circuit 2, and is indicated by a solid line in FIG. 3B at both ends of the first integration capacitor C1. Such a first integrated voltage Vc1
Is obtained.

The terminal voltage of the integrating power supply capacitor Co is applied to both ends of the second integrating capacitor C2 through the diode D6 and the resistor R2. Therefore, the second integrating capacitor C2 is charged with a constant time constant by the terminal voltage of the capacitor Co when the first signal is generated, and is discharged instantaneously when the second signal Vs2 is generated. In this example, a second integrating circuit is constituted by the second integrating capacitor C2, the diode D6, the resistor R2, and the reset circuit 2, and a second integrated voltage Vc2 is obtained between both ends of the second integrating capacitor C2. The waveform of the second integrated voltage Vc2 is as shown by a broken line in FIG.

The first integrated voltage Vc1 is input to the inverting input terminal of the comparator CP1, and the second integrated voltage Vc2 is input to the comparator CP1.
1 is input to the non-inverting input terminal. A DC voltage E is applied to an output terminal of the comparator CP1 through a resistor R13.

In the embodiment shown in FIG. 1, the comparator CP
1 outputs a rotation angle detection signal Vp as shown in FIG. 3C when the second integrated voltage Vc2 becomes equal to or higher than the first integrated voltage Vc1 at the rotation angle position θa. The rotation angle detection signal Vp becomes zero when the second signal Vs2 is generated at the 22nd rotation angle position θ2.

Here, the angle from when the signal coil generates the first signal Vs1 to when the signal coil generates the second signal Vs2 is α, and the resistance values of the resistors R1 and R2 and the integration capacitors C1 and
When the capacitance of C2 is represented by the same symbol as the symbol indicating the resistance and the capacitor, the rotational angle position θa [degree] at which the second integrated voltage Vc2 becomes equal to or higher than the first integrated voltage Vc1 is given by the following equation. Can be

Θa = (360−α) C 2 R 2 / (C 1 R 1 −C 2 R 2) (1) As is apparent from equation (1), the position where the rotation angle detection signal Vp is generated is independent of the engine speed. The rotation angle position is constant. The charging time constant R1 C1 of the integration capacitor C1
By changing at least one of the charging time constant C2 R2 of the integrating capacitor C2 and the position at which .theta.a is generated, the rotation angle detection signal Vp can be changed by changing these circuit constants according to the throttle opening, the number of revolutions, and the like. Can be changed according to the throttle opening and the number of revolutions.

Therefore, if the constant of the integration calculation of the ignition timing calculation circuit is switched at the position where the rotation angle detection signal Vp is generated, the advance width or the delay width can be arbitrarily set without changing the signal generator. Thus, various ignition characteristics can be obtained.

FIG. 2 shows another embodiment of the present invention. In this embodiment, a power supply voltage E is applied to a first integrating capacitor C3 through a diode D10 and a resistor R3, and a second integrating capacitor C3 is applied. A power supply voltage E is applied to C4 through a diode D11 and a resistor R4. The collector of the transistor Tr4 whose emitter is grounded is connected to the non-ground side terminal of the first integrating capacitor C3, and the collector of the transistor Tr5 whose emitter is grounded is connected to the non-ground side terminal of the second integrating capacitor C4. One end and the other end of the signal coil 1 are connected to the bases of the transistors Tr4 and Tr5, respectively. Diodes D12 and D13 are connected between one end of the signal coil 1 and the ground and between the other end and the ground, with the anodes facing the ground. A first integration voltage Vc3 obtained across the first integration capacitor C3
Is input to the inverting input terminal of the comparator CP2, and the second integrated voltage Vc4 obtained at both ends of the second integrating capacitor C4 is input to the non-inverting input terminal of the comparator CP2. The output terminal of the comparator CP2 is connected to a power supply through a resistor R14.

In the embodiment of FIG. 2, the diode D10
, A resistor R3, a first integrating capacitor C3, and a transistor Tr4 form a first integrating circuit.
11, a resistor R4, a second integration capacitor C4, and a transistor Tr5 constitute a second integration circuit.

In the embodiment of FIG. 2, the first integrating capacitor C3 is charged by a DC power supply of voltage E through a diode D10 and a resistor R3 with a constant time constant. When the signal coil 1 generates the first signal Vs1, the transistor Tr4 conducts and discharges the charge of the first integrating capacitor C3 almost instantaneously. Therefore, as shown by a solid line in FIG. 3D, the voltage rises at both ends of the first integrating capacitor C3 at a constant slope from the position where each first signal is generated to the position where the next first signal is generated. A first integrated voltage of the waveform is obtained.

The second integrating capacitor C4 is charged by the power supply voltage E with a constant time constant through the diode D11 and the resistor R4. When the signal coil generates the second signal Vs2, the transistor Tr5 conducts, so that the charge of the second integrating capacitor C4 is discharged almost instantaneously through the transistor Tr5. Therefore, both ends of the second integrating capacitor C4 have a constant gradient from the position where each second signal is generated to the position where the next second signal is generated, as shown by the broken line in FIG. 3D. A second integrated voltage Vc4 having a rising waveform is obtained.

The comparator CP2 outputs the rotation angle detection signal Vq when the second integrated voltage Vc4 becomes equal to or higher than the first integrated voltage Vc3 at the position of the angle θb.

The position θb at which the rotation angle detection signal Vq is generated
Is given by the following equation.

Θb = αC4R4 / (C3R3-C4R4) (2) The position θb at which the rotation angle detection signal Vq is generated is also a fixed position irrespective of the engine speed. The position .theta.b of generation of this signal can be appropriately set by changing the charging time constants C3 R3 and C4 R4 of the integration capacitor.

Next, an application example of the rotation angle detection signal generation circuit shown in FIG. 1 will be described with reference to FIGS. FIG.
In the figure, reference numeral 3 denotes an ignition coil 301 and an ignition energy storage capacitor 3.
02, a discharge thyristor 303, and an exciter coil 3 provided in a magnet generator driven by an internal combustion engine.
The ignition circuit is a capacitor discharge type ignition circuit including an element 04, a diode 305, a resistor 306, and an ignition plug 3307. In this ignition circuit, the exciter coil 304
Generates a positive half cycle output voltage in the direction of the solid line shown, the capacitor 302 is charged to the polarity shown. When the ignition signal Vt is given to the gate of the thyristor 303 at the ignition timing of the internal combustion engine, the thyristor conducts and discharges the charge of the capacitor 302 to the primary coil of the ignition coil 301. Thereby, a high voltage is induced in the secondary coil of the ignition coil. Since this high voltage is applied to the spark plug 307 attached to the cylinder of the engine, a spark is generated in the spark plug and the engine is ignited.

A power supply circuit 4 generates a constant DC voltage by using the output of the exciter coil 304. Diodes 401 and 402, a resistor 403, and a capacitor 404 are provided.
And a Zener diode 405. When the exciter coil 304 generates a positive half cycle output, the capacitor 404 is charged to the Zener voltage of the Zener diode 405 through the diode 402 and the resistor 403, and a DC constant voltage E is obtained across the capacitor 404.

Reference numeral 5 denotes an ignition operation circuit for calculating the ignition timing by using the rotation angle detection signal generation circuit shown in FIG. 1. In this operation circuit, the same reference numerals are given to the same parts as those in FIG. It is.

The configuration of the rotation angle detection signal generation circuit used in this arithmetic circuit is basically the same as that shown in FIG. 1, but in the example shown in FIG. 4, the configuration shown in FIG. As shown, since the first signal Vs1 generated by the signal coil 1 is composed of a negative signal and the second signal Vs2 is composed of a positive signal, the trigger circuit of the transistors Tr1 and Tr2 is slightly deformed. Have been added.

That is, in the example shown in FIG.
Is connected to the emitter of a transistor Tr3 through a diode D21, and a bias circuit composed of a parallel circuit of a resistor R23 and a capacitor C12 is connected between the base of the transistor Tr3 and ground. The base of the transistor Tr1 is connected to one end of the signal coil 1 through a bias circuit composed of a parallel circuit of a resistor R22 and a capacitor C11, a diode D23 and a resistor R24.

The first integrating capacitor C1 is charged by the DC voltage E obtained across the capacitor 404 of the power supply circuit 4 through the diode D5 and the resistor R1. When the first signal Vs1 is generated, the transistor Tr3 is turned on and the transistor Tr2 is turned on, so that the capacitor Co is almost instantaneously charged to the power supply voltage E. The second integrating capacitor C2 is charged by the voltage across the capacitor Co. The capacitance of the capacitor Co is set to be sufficiently larger than the capacitance of the second integrating capacitor C2, but the voltage across the capacitor Co increases as the charging of the second integrating capacitor C2 progresses. It is going down. When the second signal Vs2 is generated, the transistor Tr1 is turned on.
The capacitors Co, C1 and C2 discharge almost instantaneously. Therefore, the waveform of the voltage Vco across the capacitor Co is as shown in FIG. 5B, and the voltage across the first integrating capacitor C1 and the second integrating capacitor C2 is as shown in FIG. 5C. A first integrated voltage Vc1 and a second integrated voltage Vc2 are obtained. In the ignition timing calculation circuit used in the embodiment of FIG. 4, in addition to the rotation angle detection signal generation circuit, integration capacitors C14 and C15, a circuit for controlling the charging and discharging of these integration capacitors, an integration capacitor C14 and A comparator CP3 for comparing the integrated voltages obtained respectively at both ends of C15 is provided.
The ignition signal Vi is supplied to the gate of the thyristor 303 of the ignition device from the output side of the thyristor 303 through the diode D29. The outline of the operation of the ignition timing calculation circuit is as follows.

When the comparator CP1 generates the rotation angle detection signal Vp at the position of the rotation angle θa, the transistor Tr6 is turned on, so that the capacitor C13 is charged. When the transistor Tr1 is turned on by the generation of the second signal Vs2 at the second position .theta.2, the electric charge of the capacitor C13 is supplied to the diode D13.
It discharges almost instantaneously through 25 and the transistor Tr1.
Accordingly, a voltage having a rectangular waveform that maintains a high level state from the position of the angle θa to the position of the angle θ2 is obtained at both ends of the capacitor C13. When a voltage is generated at both ends of the capacitor C13, the transistor Tr7 is turned on, so that the integrating capacitor C14 is charged. The capacitor C14 is initially charged instantaneously through the collector and emitter of the transistor Tr7, but the voltage across the capacitor C14 reaches a level corresponding to the voltage obtained by dividing the voltage across the capacitor C13 by the resistors R25 and R26. After the transistor Tr7 is turned off, the battery is charged with a constant time constant through the resistor R27.
Therefore, at both ends of the integrating capacitor C14, the rotation angle detection signal Vp is generated at the position of the angle .theta.a, and at the same time, rises to a predetermined level and then rises at a constant slope to the second signal generation position .theta.2. An integrated voltage Vi1 having a waveform returning to zero is obtained.

The integrating capacitor C15 is charged with a constant time constant by the power supply voltage E through the diode D28 and the resistor R28. When the signal Vs2 is generated at the second position and the transistor Tr1 is turned on, the diode D27 and the transistor Tr1 are turned on.
And it is discharged almost instantaneously. Therefore, as shown in FIG. 5 (E), both ends of the integrating capacitor C15 rise at a constant gradient from each second position .theta.2 to the next second position .theta.2, and zero at each second position .theta.2. Is obtained. When the integrated voltage Vi1 becomes equal to or higher than the integrated voltage Vi2 at the position of the angle θi, the potential of the output terminal of the comparator CP3 becomes high, and when the output of the comparator CP3 becomes high, FIG. As shown in FIG.
Thyristor 303 is supplied with ignition signal Vt.

At a low speed of the engine, the comparator CP3 cannot generate an ignition signal because the integrated voltage Vi1 cannot exceed the integrated voltage Vi2. At this time, when the signal coil 1 generates the second signal Vs2, the ignition signal Vt is given through the diode D22 and the resistor R21.

Since the time for charging the integrating capacitor C15 becomes shorter as the number of revolutions increases, the integration voltage Vi2
The peak value becomes lower as the rotation speed increases. The integral voltage Vi1 also decreases with an increase in the rotation speed, but since the charging period of the integration capacitor C14 is short, the decrease rate of the integral voltage Vi1 with the increase in the rotation speed is smaller than the decrease rate of the integral voltage Vi2. small. Therefore, when the rotation speed N increases to a certain value, the integrated voltage Vi1 can exceed the integrated voltage Vi2. When the rotation speed further increases, the position (ignition timing) θi at which the integrated voltage Vi1 becomes equal to or higher than the integrated voltage Vi2.
Is advanced as the rotation speed increases. When the ignition timing θi is advanced to the position θa at which the rotation angle detection signal is generated, the advance of the ignition timing is stopped, and the ignition timing is fixed at the position (constant) of the rotation angle θa even if the rotation speed further increases. Therefore, the advance angle width is limited to the range from θ2 to θa.

The ignition characteristics obtained by the ignition device of FIG. 4 are as shown in FIG. In the figure, θa1 to θan indicate the maximum advance positions obtained when the position θa of the rotation angle detection signal Vp is variously changed, and adjust the charging time constant of the integration capacitor of the rotation angle detection signal generation circuit. By adjusting the position θa at which the rotation angle detection signal is generated, any of these maximum advance positions can be selected.

FIG. 7 shows another example of the configuration of an ignition device to which the rotation angle detection signal generating circuit according to the present invention is applied. In this ignition device, the configuration of the ignition circuit 3 and the configuration of the power supply circuit 4 are shown in FIG. 4, the ignition circuit 3 performs the ignition operation when the ignition signal Vt is given from the ignition timing calculation circuit 5.

In the ignition timing calculation circuit 5 of the ignition device shown in FIG. 7, the rotation angle detection signal Vp obtained from the comparator CP1 of the rotation angle detection signal generation circuit constructed similarly to the example of FIG. The ignition signal Vt is given to the gate of the thyristor 303 of the ignition circuit 3 through R30 and the diode D30. Further, integrating capacitors C14 and C15 whose charging and discharging are controlled by the same circuit as the example shown in FIG. 4 and a comparator CP3 for comparing the integrated voltages Vi1 and Vi2 obtained at both ends of these integrating capacitors are provided. The signal Vt 'obtained from the comparator CP3 is supplied to the gate of the thyristor 303 as an ignition signal through a diode D29.

In this example, an OR circuit is constituted by the diodes D29 and D30, and the rotation angle detection signal Vp obtained from the comparator CP1 and the signal Vt obtained from the comparator CP3.
'Is supplied to the gate of the thyristor 303 through the OR circuit. Therefore, of the signals Vp and Vt ', the signal generated earlier gives the thyristor 303 an ignition signal Vt.
At the position where the ignition signal Vt is generated. As in the example shown in FIG. 4, the position at which the signal Vt 'is generated advances as the engine speed increases. However, when the engine is running at a low speed, the position at which the signal Vt' is generated becomes the position θa at which the signal Vp is generated.
Therefore, the ignition operation is performed at the position where the rotation angle detection signal Vp is generated (constant irrespective of the rotation speed). When the rotation speed exceeds the set value, the signal Vt 'is generated earlier than the rotation angle detection signal Vp, so that the ignition operation is performed at the position where the signal Vt' is generated. The advance of the ignition timing stops at the first position θ1. Therefore, the characteristics of the ignition timing θi obtained by the ignition device shown in FIG. 7 with respect to the rotation speed N are as shown in FIG. In the figure, θa1 to θa
An indicates an ignition timing at a low speed obtained when variously changing the generation position of the rotation angle detection signal Vp for the ignition timing calculation control. By adjusting the integration constant of the rotation angle detection signal generation circuit, Either of these ignition timings can be selected.

FIG. 10 shows still another application example of the rotation angle detection signal generation circuit shown in FIG. 1. In this example,
As shown in FIG. 12, the ignition timing .theta.i is advanced in the region from the set rotation speed N1 to N2, and the ignition timing is retarded in the region above the set rotation speed N3.

In the example shown in FIG. 10, similarly to the example shown in FIG. 4, the integration capacitors C14 and C15, a circuit for controlling their charging and discharging, and the integration voltages obtained at both ends of the integration capacitors C14 and C15 are compared. A comparator CP3 is provided. In this example, the capacitor Co used as a power supply for charging the second integration capacitor C2 of the rotation angle detection signal generation circuit is shared as a power supply for charging the integration capacitor C14. In the example shown in FIG. 10, an integrating capacitor C16 is further provided. The integrating capacitor C16 is charged by the power supply voltage E through the diode D31 and the resistor R31, and the capacitor Co is charged at the first position θ1. In this case, the voltage across the capacitor Co is additionally charged through the diode D32 and the resistor R32. The non-ground side terminal of the integrating capacitor C16 is connected to the collector of the transistor Tr1 through the diode D33 so that the capacitor C16 is discharged almost instantaneously when the transistor Tr1 is turned on at the second position θ2.

Accordingly, as shown in FIG. 11E, the integrated voltage Vi3 obtained at both ends of the integrating capacitor C16 is equal to the second voltage Vi3.
From the position .theta.2 to the first position .theta.1 at the first inclination, and from the first position .theta.1 to the second position .theta.2 at the second inclination larger than the first inclination to the second position .theta.2. The waveform returns to zero. Since the peak value of the integrated voltage Vi3 decreases as the engine speed increases, the position where the integrated voltage Vi3 exceeds the reference voltage Vr is delayed as the engine speed increases. In this example, the engine speed is set to the retard start speed N
3, the integrated voltage Vi3 at the first position θ1
Are set to be higher than the reference voltage Vr.

In the example shown, a collector-emitter circuit of the transistor Tr8 is connected in parallel to both ends of the capacitor C16, and the rotation angle detection signal Vp obtained from the comparator CP1 is input to the base of the transistor Tr8. Therefore, when the rotation angle detection signal Vp is generated, the transistor T
r8 conducts and discharges the integrating capacitor C16 almost instantaneously.

The integrated voltage Vi3 obtained at both ends of the integrating capacitor C16 is input to the non-inverting input terminal of the comparator CP4.
A reference voltage Vr obtained by dividing the power supply voltage E by resistors R34 and R35 is input to the inverting input terminal of the comparator CP4. The output terminal of the comparator CP3 is connected to the gate of the thyristor 303 of the ignition circuit through a resistor R38 and a diode D29, and the output terminal of the comparator CP4 is a diode D3.
Connected to 29 anodes. The output of the comparator CP1 is connected to the thyristor 3 through a resistor R30 and a diode D30.
The signal supplied to the gate of the thyristor 303 is supplied to the gate of the thyristor 303 through a bias circuit comprising a parallel circuit of a capacitor C11 and a resistor R22, a diode D22 and a resistor R21.

In the ignition device of FIG. 10, the output terminal of the comparator CP3 and the output terminal of the comparator CP4 are connected so as to form an AND circuit, so that the output of the comparator CP3 and the output of CP4 are both When the signal goes high, a signal is output through the diode D29. Also diode D29
, D30 and D22 are connected to each other so as to form an OR circuit. Therefore, the signal output through the diode D29, the signal output through the diode D30 from the output side of the comparator CP1, and the diode D22 through the signal coil 1. The ignition signal is given to the thyristor 303 by the signal generated first among the signals output through the resistor R21 and the resistor R21.

In the example shown in FIG. 10, the rotation angle detection signal V is set only in the high speed region where the advance of the ignition timing of the engine is completed.
A collector-emitter circuit of a transistor Tr10 is connected to both ends of a second integrating capacitor C2, and a transistor is connected between the base and the emitter of the transistor Tr10 so that the position where p is generated is constant irrespective of the rotational speed. The collector-emitter circuit of Tr9 is connected. A base current is supplied to the transistor Tr10 from the power supply circuit through the resistor R36, and a base current is supplied to the base of the transistor Tr9 from the output terminal of the comparator CP3 through the resistor R37.

FIGS. 11A to 11G show signal waveforms at various parts of the ignition timing calculation circuit 5 in FIG. 10, but the waveforms shown by solid lines in FIGS. The case where the rotation speed is equal to or less than the set value set in the high-speed region is shown, and the waveform indicated by the broken line indicates the case where the rotation speed is equal to or more than the set value.

In the ignition timing calculation circuit shown in FIG. 10, the position where the output of the comparator CP3 is at a high level advances as the rotational speed increases. When the output Vt 'of the comparator CP3 is zero, the transistor Tr9 is turned off and the transistor Tr10 is turned on, so that the capacitor C2 is prevented from being charged. When the output of the comparator CP3 goes high, the transistor Tr9 conducts and the transistor Tr1
Since 0 is cut off, charging of the integrating capacitor C2 is started. Since the position where the output of the comparator CP3 becomes high level advances as the rotational speed increases, the charge start position of the capacitor C2 also advances as the rotational speed increases.

When the rotational speed of the engine reaches the set value and the output of the comparator CP3 becomes high at the first position (position where the first signal Vs1 is generated) θ1, the integrating capacitor C2 is set.
Is fixed at the first position .theta.1, the position at which the rotation angle detection signal Vp is generated does not change even if the rotational speed further increases, and as shown in FIG. θ
The rotation angle detection signal Vp is generated at a.

In the ignition device shown in FIG. 10, when the engine is running at a low speed, the output of the comparator CP4 is maintained at a high level from the first position θ1 to the second position θ2.
Since the output of the comparator CP3 cannot be at a high level, no ignition signal is output through the diode D29, and a parallel circuit of the capacitor C11 and the resistor R22 from the signal coil 1 as in the example shown in FIG. And diode D22
An ignition signal is supplied to the thyristor 303 through the resistor R21 and the resistor R21. Therefore, when the engine is running at a low speed, the ignition operation is performed at the second position θ2. Here, the second position θ1 is set to the maximum retard position of the engine.

When the rotational speed of the engine exceeds the advance rotational speed N1, the comparator C is switched at a position where the phase is advanced from the second position θ2.
Since the output of P3 becomes high, the ignition timing is advanced. When the advancing end rotation speed N2 is reached, the first
Since the output of the comparator CP3 becomes high level at the position θ1, the advance angle stops. The first position θ1 is set to the maximum advance position of the engine. When the rotation speed further increases and exceeds the retardation start rotation speed N3, the output V of the comparator CP4
Since the position θi at which s becomes a high level is later than the first position θ1 as shown in FIG. 11 (G), the ignition timing is retarded. When the output Vs of the comparator CP4 lags behind the position .theta.a of the rotation angle detection signal Vp, the ignition signal Vt is given through the diode D30 by the rotation angle detection signal Vp. It is fixed at the generation position θa of the signal Vp. Since the position θa at which the rotation angle detection signal Vp is generated can be adjusted by circuit constants, the maximum retard position is represented by θa1 to θa in FIG.
It can be set appropriately like an.

[0057]

As described above, according to the present invention, it is possible to generate a rotation angle detection signal for calculating the ignition timing at an arbitrary position which is not affected by the rotation speed. By controlling the calculation, the advance width or the retard angle width can be set arbitrarily, and the ignition timing in a specific rotation region can be determined using the signal. Therefore, there is an advantage that various ignition characteristics can be obtained only by changing the circuit constant without changing the signal generator.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing another embodiment of the present invention.

3 (A) to 3 (E) are waveform diagrams showing voltage waveforms at respective parts in the embodiment of FIGS. 1 and 2. FIG.

FIG. 4 is a circuit diagram showing a configuration example of an ignition device to which the signal generation device of the present invention is applied.

5 (A) to 5 (F) are waveform diagrams showing voltage waveforms at various parts in FIG. 4;

FIG. 6 is a diagram showing ignition characteristics obtained by the ignition device of FIG. 4;

FIG. 7 is a circuit diagram showing another configuration example of the ignition device to which the signal generation device of the present invention is applied.

8 (A) to 8 (F) are waveform diagrams showing voltage waveforms at various parts in FIG. 7;

FIG. 9 is a diagram showing ignition characteristics obtained by the ignition device of FIG. 8;

FIG. 10 is a circuit diagram showing still another configuration example of an ignition device to which the signal generation device of the present invention is applied.

FIGS. 11A to 11G are waveform diagrams showing voltage waveforms at various parts in FIG. 10;

FIG. 12 is a diagram illustrating ignition characteristics obtained by the ignition device of FIG. 10;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Signal coil 2 Reset circuit Co Capacitors for integrating power supply C1, C3 First integrating capacitor C2, C4 Second integrating capacitor R1 to R4, R11 to R14 Resistance Do to D5, D10 to D13 Diode CP1, CP2 Comparator Tr1 to Tr5 transistor

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-131868 (JP, A) JP-A-1-140772 (JP, A) JP-A-1-142268 (JP, A) JP-A-55-131868 151168 (JP, A) JP-A-62-85173 (JP, A) JP-A-63-51162 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F02P 5/155

Claims (2)

(57) [Claims] 1. An integration capacitor is charged with a predetermined time constant.
The integration voltage generated by performing the integration operation
The ignition timing of the internal combustion engine ignition device that calculates the ignition timing using
Start and end positions of the integration operation in the period calculation circuit
And switching position of integration constant, ignition timing in specific rotation range
Rotation angle for ignition timing calculation used to determine etc.
The detection signal is a signal that does not change depending on the rotation speed of the internal combustion engine.
Rotation angle detection signal for ignition timing calculation generated at the rotation angle position
A first signal and a second signal having different polarities at a first rotation angle position of the internal combustion engine and at a second rotation angle position having a phase delayed from the first rotation angle position. Generating a second signal by charging a first integrating capacitor with a constant time constant between generation of each second signal and generation of the next second signal. A first integration circuit for performing an integration operation for instantaneously discharging the first integration capacitor to obtain a first integration voltage across the first integration capacitor; and generating the first signal. An integration operation of charging the second integration capacitor with a constant time constant during a period from when the second signal is generated until the second signal is generated and instantaneously discharging the second integration capacitor when the second signal is generated. To obtain a second integrated voltage across the second integrating capacitor. An integrating circuit, first by comparing the first integration voltage and the second integrated voltage 2
Integrated voltage first the point <br/> rotation angle detection signal the ignition timing calculation of the internal combustion engine, characterized by comprising a comparator for outputting a computation fire timing when it becomes more integrated voltage of Rotation angle detection signal generation circuit. 2. An integration capacitor is charged with a predetermined time constant.
The integration voltage generated by performing the integration operation
The ignition timing of the internal combustion engine ignition device that calculates the ignition timing using
Start and end positions of the integration operation in the period calculation circuit
And switching position of integration constant, ignition timing in specific rotation range
Rotation angle for ignition timing calculation used to determine etc.
The detection signal is a signal that does not change depending on the rotation speed of the internal combustion engine.
Rolling angle position ignition timing calculation rotation angle detection signal generated by the location
A first signal and a second signal having different polarities at a first rotation angle position of the internal combustion engine and at a second rotation angle position having a phase delayed from the first rotation angle position. And a signal generator that generates the first signal and charges the first integrating capacitor with a constant time constant from the time when each first signal is generated until the time when the next first signal is generated. A first integration circuit for performing an integration operation for instantaneously discharging the first integration capacitor when it occurs to obtain a first integration voltage across the first integration capacitor; and generating each second signal. second charging to the second signal to the integrating capacitor at a fixed time constant until a second signal of the following are generated to discharge the integration capacitor of the second instantaneously upon the occurrence since the Performing an integration operation to obtain a second integration voltage across the second integration capacitor And second integration circuits, first by comparing the first integration voltage and the second integrated voltage 2
And a comparator for outputting a rotation angle detection signal for calculating the ignition timing when the integrated voltage becomes equal to or higher than the first integrated voltage. Generator circuit.