JP3447445B2 - Capacitor charge / discharge igniter - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition key switch for starting an engine of an automobile, a motorcycle or the like, and the engine is started only when the key is operated by the key. And a capacitor charge / discharge type ignition device. 2. Description of the Related Art FIG. 8 shows an example of a circuit configuration of a conventional capacitor charge / discharge type ignition device.
Denotes an ignition key switch (hereinafter abbreviated as an IGN key switch) having a switch x between terminals A and B. 3 is a DC-DC converter, which is a rectifier diode D1.
, A smoothing capacitor C1, a transformer T1, a switching transistor Q1, a switching circuit 4 including a high-frequency switching oscillator, and the like. 5 is an ignition coil (hereinafter abbreviated as IGN coil), 6 is a pulsar coil for detecting the timing of ignition, and D2 and D3.
Is a rectifier diode, S1 is an ignition thyristor, C2 is an ignition capacitor, 7 is an overvoltage detection circuit that detects when the ignition capacitor C2 is overcharged, and 8 is a control circuit which is an ignition thyristor based on a signal from the pulser coil 6. S1
Is controlled, and the operation of the switching circuit 4 is controlled based on the output signal of the overvoltage detection circuit 5. When the IGN key switch 2 is turned on to close its contact x, the DC power supply 1
The switching circuit 4 is operated by the control circuit 8 to switch the switching transistor Q1, and the ignition capacitor C2 is charged through the transformer T1. When the charging capacitor C2 reaches a specified voltage by this charging, the overvoltage detection circuit 7 operates to stop the operation of the switching transistor Q1 through the control circuit 8. Next, when the engine starts to rotate, when an ignition signal is input from the pulsar coil 6 to the control circuit 8, the ignition thyristor S1 is fired, the energy of the ignition capacitor C2 is discharged to the IGN coil 5, and the engine is started. Ignite. [0004] In the conventional capacitor charge / discharge ignition device, the engine is started by closing the contact x (on state) by turning on the IGN key switch 2. When the wiring around the engine is operable, particularly in the case of a motorcycle, among automobiles and the like, the wiring is connected between the input / output terminals AB of the IGN key switch 2 or between these terminals. The connection line between the IGN key switch 2 and another connection line is directly connected to each other by using another electric wire.
Can be brought into the same state as when turned on. The present invention has been made to solve such a problem.
An object of the present invention is to provide a capacitor charge / discharge type ignition device in which the engine is not started even if the input / output terminals of the GN key switch are connected using another connection line. [0005] A capacitor charge / discharge type ignition device according to the present invention comprises: a DC power source or generator output;
An ignition key switch including a C-DC converter, a switch (first switch) for turning on / off a connection between the DC power supply or generator output and the DC-DC converter, and an output of the DC-DC converter. A capacitor charge / discharge igniter comprising: a capacitor to be charged after rectification; a thyristor that operates to discharge the charge of the capacitor based on an output signal of the pulsar coil; and an ignition coil that performs an ignition operation by the discharge current. In the ignition key switch,
The ignition key switch is connected in series with an ON / OFF operation of the first switch of the ignition key switch, and one end of the ignition key switch is connected to the DC power supply or the generator output. A second switch, which is provided between the DC-DC converter connection side of the first switch and the other end of the second switch, wherein the first switch and the second switch are turned on; A differentiating circuit for differentiating the output waveform of the oscillation circuit when the differential operation is performed, a time width / voltage converting circuit for converting a differential operating time width of the differentiating circuit into a voltage, and an output voltage of the time width / voltage converting circuit being within a predetermined range. And a comparison determination circuit for determining whether or not
The ignition operation is performed only when the output voltage of the time width / voltage conversion circuit is within a predetermined range. FIG. 1 is a circuit diagram of an embodiment of the present invention. The same parts as those in the circuit diagram of the conventional example shown in FIG. 8 are denoted by the same reference numerals, and the description thereof will be omitted. In FIG. 1, 11
Denotes an ignition key switch (hereinafter abbreviated as an IGN key switch) having a switch x between terminals A and B and a series circuit of a resistor R1 and a switch y between terminals A and C. 12 is a differentiating circuit, which is a switching transistor Q2
, A differentiating capacitor C3, a resistor R2, a resistor R1 built in the IGN key switch 11, and the like. The switching circuit 13 differentiates the output waveform of the transistor Q2. Numeral 14 denotes a time width / voltage conversion circuit for converting the time width of the differential operation, which is continuously input, into a voltage level, and includes a buffer U1, a resistor R
3, R4 and R5, a transistor Q3, a capacitor C4 and the like. Reference numeral 15 denotes a comparison / determination circuit which determines whether or not the output voltage level of the time width / voltage conversion circuit 14 is within a predetermined voltage range. Output a signal to cause a misfire operation. The conditions for the determination are as follows.
Has a voltage at its terminal B and an operation permission signal is being input from the control circuit 16. 16 is a control circuit,
In addition to the function of the control circuit 8 in the above-described conventional example, control for operating the switching circuit 13 and the comparison / determination circuit 15 for a certain period of time, and when the power supply voltage is not applied to the IGN key switch 11, the switching circuit 13
Further, control for stopping the operation of the comparison determination circuit 15 is performed. Next, the operation of the circuit diagram of FIG. 1 will be described with reference to the waveform diagrams of FIGS. First IGN key switch 1
The operation when the switch 1 is properly operated and the switches x and y are on will be described with reference to FIG. First, when the DC power of FIG. 2A is supplied to the terminal B of the IGN key switch 11, the ignition for ignition is performed by the output of the DC-DC converter 3 in the same manner as in the description of the conventional circuit configuration shown in FIG. The energy stored in the capacitor C2 is discharged to the IGN coil 3 to ignite the engine. Switching circuit 1
The operation waveform of the collector of the switching transistor Q2 by the operation 3 becomes the waveform shown in FIG. Then, the signal is continuously differentiated by the time constant of the resistor R1 and the capacitor C3 in the IGN key switch 11, and the output of the differentiating circuit 12 has the waveform shown in FIG. This waveform is shaped into the waveform shown in FIG. 2D by the buffer U1 of the time width / voltage conversion circuit 14, and is applied to the base of the transistor Q3 via the resistor R3. The transistor Q3 turns on only when the output of the buffer U1 is at "L" level and charges the capacitor C4, and turns off the transistor Q3 while the output of the buffer U1 is at "H" level. C4 is discharged. Therefore, the voltage of the capacitor C is converted as the voltage level V0 having the waveform shown in FIG. In this state, the comparison and judgment circuit 15 sets the voltage level V0 of the capacitor C4 to
Since the voltage between the upper limit value VH and the lower limit value VL, that is, the condition of VH>V0> VL is satisfied, the comparison / determination circuit 15 sets " At the L level, an abnormal state signal is not output to the control circuit 16, and the ignition operation is performed with the ignition enabled. When the DC power supply is disconnected and only the generator output is generated, the power supply is temporarily generated and activated as shown in FIG. 2A, and then the power supply level is suspended for a certain time t0 to t1. However, this power supply level is detected by the comparison and judgment circuit 15, and during the suspension period, the comparison and judgment circuit 15 is not operated, and the ignition stop signal is not sent to the control circuit 16. . Next, if the terminals of the IGN key switch 11 are intentionally short-circuited by a wire or the like without operating the IGN key switch 11, the differentiating circuit 12 and the time width / voltage converting circuit 14 do not operate normally. A description will be given of how the control circuit 16 stops the ignition so that the voltage level deviates from the voltage level set in the comparison determination circuit 15. First, a case where the terminals AB are short-circuited will be described with reference to FIG. Due to the short circuit between terminals AB
Since a DC voltage is applied to the terminal B, the switching transistor Q2 operates, and the collector operation waveform becomes the waveform shown in FIG. 3B as in the normal operation. However, the output waveform of the differentiating circuit 12 is not synchronized with the operation of the switching transistor Q2 because the circuit between the terminals A and C is not formed, so that the output waveform of the differentiating circuit 12 is synchronized with the operation of the switching transistor Q2. And the waveform shown in FIG. Therefore, the output waveform of the buffer U1 of the time width / voltage conversion circuit 14 becomes the waveform shown in FIG. 3D, and the voltage level V0 of the capacitor C4 exceeds the upper limit value VH set in the comparison judgment circuit 15. Voltage, ie V
H <V0> VL, so that the condition of VH>V0> VL is not satisfied. Therefore, the comparison / determination circuit 15 sends a signal to stop ignition to the control circuit 16, and the control circuit 16 does not supply an ignition signal to the gate of the thyristor S1, thereby causing a misfire state. Next, a case where the terminals A and B and the terminals A and C are short-circuited without operating the IGN key switch 11 will be described with reference to FIG. Since a DC voltage is applied to the terminal B due to the short circuit between the terminals A and B, the switching transistor Q2 operates, and the collector operation waveform becomes the waveform shown in FIG. 4B as in the normal operation. However, the output waveform of the differentiating circuit 12 is such that the output terminal voltage of the capacitor C3 is reduced due to a short circuit between the terminals AC and DC.
1 and is fixed to a higher voltage level, and has a waveform shown in FIG. Therefore, the time width /
The output waveform of the buffer U1 of the voltage conversion circuit 14 is shown in FIG.
The waveform shown in (d) is obtained, and the voltage level V0 of the capacitor C4 is equal to the lower limit value VL set in the comparison determination circuit 15.
, VH> V0 <VL, and VH> V0
> VL is not satisfied. Therefore, the comparison / determination circuit 15 sends a signal for stopping ignition to the control circuit 16 to inactivate the thyristor S1 to cause a misfire as described above. In addition to the above-described normal operation state of the IGN key switch and intentional short-circuits between terminals other than the intentional short-circuit between the terminals described with reference to FIGS. It is as shown in Table 1. [Table 1] The intentional shorts in Table 1 above are substantially the same, and the intentional shorts are substantially the same. In addition, since no DC power is applied to the terminal B during the intentionally short circuit, the DC-DC capacitor 3 does not operate, and the differentiation circuit 12 and the time width / voltage conversion circuit 14 do not operate. Become. Therefore, the ignition circuit does not operate. Next, an example in which the DC power supply 1 shown in FIG. 1 is open and started using a generator will be described with reference to FIGS.
This will be described with reference to FIG. In FIG. 5, reference numeral 17 denotes a generator coil, a coil 17a for turning on a lamp 18, and a coil 17 for charging a battery (the DC power supply 1 shown in FIG. 1).
b. Reference numeral 19 denotes a control device for turning on the lamp 18 and charging the battery. Other circuit configurations are the same as those in FIG. The operation waveform diagram of FIG. 6 shows a case where the IGN key switch 11 is normally operated and the switches x and y are in an on state, and the terminal B (power supply terminal) and the terminal C (detection terminal) are shown in FIG. Is applied. This intermittent half-wave voltage is smoothed by the capacitor C1 as shown in FIG. FIG. 6 (a)
The intermittent half-wave voltage is changed by the switching circuit 13 so that the collector waveform of the transistor Q2 becomes the waveform shown in FIG.
The waveform at the terminal C becomes the waveform shown in FIG. This waveform is shaped by the buffer U1 to obtain the output waveform shown in FIG. Therefore, the voltage waveform of the capacitor C4 is converted into the voltage level V0 of the waveform shown in FIG. 6 (g) by the ON / OFF action of the transistor Q3 as described in FIG. Here, the comparison determination circuit 15 sets the voltage level of the terminal B between the value of VZ + α and the value of VZ or less (hysteresis), that is, the power supply terminal detection level of the comparison determination circuit 15 shown in FIG. Voltage level V of the capacitor C4 during the determination section
0 is compared with the upper limit value VH and the lower limit value VL of the comparison and determination circuit 15, and VH>V0> under the condition of normal operation.
Since VL is satisfied, the output of the comparison and judgment circuit 15 is at "L" level as shown in FIG.
The ignition circuit does not output an abnormal state signal to the ignition circuit 6 and performs an ignition operation in an ignition enabled state. Next, an abnormal state in which the terminals A and B of the IGN key switch 11 are intentionally short-circuited with an electric wire or the like without operating the IGN key switch 11 will be described with reference to a waveform diagram shown in FIG. The intermittent half-wave voltage which is the generator output at the terminal B in FIGS. 7A to 7D, the VCC voltage level smoothed by the capacitor C1, the power supply terminal detection level of the comparison and judgment circuit, and the collector waveform of the transistor Q2 are shown in FIG. The waveform is the same as when the IGN key switch 11 shown in FIG. 6 is operated normally. However, since the terminals A and C are off, the differentiating circuit 12 does not operate normally, and the voltage waveform at the terminal C (detection terminal) is the collector waveform of the transistor Q2 as shown in FIG. Has the same waveform as Therefore, the output waveform of the buffer U1 has a wide "L" level section as shown in FIG.
As shown in FIG. 7 (g), the charging time of the capacitor C4 becomes longer and the discharging time becomes shorter.
0 is a voltage exceeding the upper limit value VH set in the comparison judgment circuit 15, that is, VH <V0> VL, and the comparison judgment circuit 15 indicates to the control circuit 16 an abnormal state as shown in FIG. An H "level ignition stop signal is sent out, and the control circuit 1
Reference numeral 6 indicates that the thyristor S1 is inoperative and is in a misfire state. Note that although the ignition stop signal is output or not output from the comparison determination circuit 15, the engine stops during misfire and the output voltage from the generator is also lost, so that the thinned ignition state does not continue. In addition, other abnormal operations in the case of ignition by this generator also cause the ignition circuit to misfire or prevent the ignition circuit from operating as in the case of Table 1 shown as the abnormal operation in the DC power supply 1 described above. I have to. As described above, according to the present invention, the IGN key switch 11 is normally operated, the switches x and y are turned on, the differentiation circuit 12 is normally operated, and the output V0 of the time width / voltage conversion circuit 14 is output. Is set within the range of the set value of the comparison judgment circuit 15, that is, the range of the upper limit value VH to the lower limit value VL, and the ignition circuit is started. It is extremely difficult to activate the ignition circuit, depending on the connection to the engine. That is, if the resistance value of the resistor R1 built in the IGN key switch 11 cannot be known, the ignition circuit cannot be started. Further, the resistance value of the resistor R1 can be easily changed depending on the relationship with other circuit elements, and it is difficult to know its rated value. As described in detail above, according to the present invention, it is extremely difficult to start the engine depending on the operation such as short-circuiting or opening between the external terminals of the IGN key switch.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing one embodiment of a capacitor charge / discharge type ignition device of the present invention. FIG. 2 is an operation waveform diagram illustrating a circuit operation according to the present invention;
This shows a case where the GN key switch is operated normally. FIG. 3 is an operation waveform diagram illustrating the circuit operation of the present invention;
A case where an attempt is made to intentionally short-circuit a certain terminal of the GN key switch to start the circuit. FIG. 4 is an operation waveform diagram illustrating a circuit operation according to the present invention;
This shows a case in which another terminal of the GN key switch is intentionally short-circuited to start the circuit. FIG. 5 is a circuit diagram showing another embodiment of the capacitor charge / discharge type ignition device of the present invention. FIG. 6 is an operation waveform diagram illustrating another circuit operation of the present invention, showing a case where an IGN key switch is normally operated. FIG. 7 is an operation waveform diagram for explaining another circuit operation of the present invention, showing a case where a certain terminal of an IGN key switch is intentionally short-circuited to start the circuit. FIG. 8 is a circuit diagram showing an example of a conventional capacitor charge / discharge type ignition device. [Description of Signs] 1 DC power supply 2, 11 Ignition key switch (IGN key switch) 3 DC-DC converter 4, 13 Switching circuit 5 Ignition coil (IGN coil) 6 Pulser coil 7 Overvoltage detection circuit 8, 16 Control circuit 12 Differentiation Circuit 14 Time width / voltage conversion circuit 15 Comparison judgment circuit 17 Generator coil 18 Lamp 19 Control device D1, D2, D3 Rectifier diode C1 Rectifier capacitor C2 Ignition capacitor C3 Differentiation capacitor Q1 Switching transistor Q2, Q3 Transistor T1 Transformer S1 Thyristor for ignition R1 to R5 Resistor U1 Buffer

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takeshi Konno 1-4-1 Chuo, Wako-shi, Saitama Pref. Honda Technical Research Institute Co., Ltd. (56) References JP-A-4-201684 (JP, A) JP-A-Hei 3-210069 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F02P 11/04 B60R 25/04 F02N 15/00 F02P 3/08 H01H 27/06 F02D 45/00

Claims (1)

(57) [Claim 1] DC power supply or generator output and DC-D
C converter, the DC power supply or generator output and DC
An ignition key switch having a switch (first switch) for turning on / off a connection with a DC converter, a capacitor for rectifying and then charging the output of the DC-DC converter, and a charger for charging the capacitor. In a capacitor charge / discharge type ignition device including a thyristor that operates to discharge based on an output signal of a coil and an ignition coil that performs an ignition operation by the discharge current, the ignition key switch includes a resistor connected in series with a resistor. A second switch provided so that the ignition key switch is turned on / off in conjunction with on / off operation of the first switch, and one end of the ignition key switch is connected to the DC power supply or the generator output; The first switch is connected to the DC-DC converter side and the second switch. Is provided between the other end of said first
A differentiating circuit for differentiating the output waveform of the oscillation circuit when the first switch and the second switch are turned on, and a time width for converting the differential operation time width of the differentiating circuit into a voltage.
A voltage conversion circuit, and a comparison determination circuit that determines whether an output voltage of the time width / voltage conversion circuit is within a predetermined range, wherein an output voltage of the time width / voltage conversion circuit is within a predetermined range. Characterized in that the ignition operation is performed only when the ignition timing is in the range.