JP3926476B2 - Transistor ignition device - Google Patents

Description

[0001]
[Field of the Invention]
The present invention relates to a transistor type ignition device having an ignition configuration capable of reliably supplying a necessary current to an IGN coil and securing ignition energy even when a battery of the ignition device for a motorcycle is disconnected.
[0002]
[Prior art]
8, 9, and 10 are a conventional transistor type ignition circuit, operation waveform diagrams of each part when the battery is connected, and operation waveform diagrams of each part when the battery is open, in which 1 is a generator, 2 is REG RECT, 3 is Battery, 4 is a waveform shaping circuit, 5 is an ignition timing control circuit, 6 is an energization time control circuit, 7 is an F / F circuit, 8 is a control circuit, 9 is an IGN coil, R1 is a resistor, and Q1 is a switching transistor. .
[0003]
In FIG. 8, it is assumed that the power supply voltage used is a direct current power supply for the battery. First, the function of the control circuit 8 includes an ignition timing control circuit 5 for determining the ignition timing and a transistor energization time control circuit 6 for determining the energization time of the IGN coil, and the transistor based on the signals from the 5 and 6 circuits. The F / F circuit 7 outputs a drive signal to Q1. The operation will be described based on this. Based on the PC timing signal, the energization start timing is calculated by the 6 transistor energization control circuit so that the transistor Q1 has a certain energization time with respect to the rotation speed, and the transistor Q1 is By driving and turning off the transistor Q1 at the timing of ignition timing, the plug is ignited via the IGN coil, and the engine is operated.
[0004]
Next, regarding the power supply voltage, when the battery power supply is disconnected and only the generator output is obtained, the power supply voltage disappears during the energizing time of the transistor Q1, the power supply is insufficient, and the ignition energy is insufficient. Thus, there is a problem that misfire and ignitability deteriorate.
[0005]
[Problems to be solved by the invention]
However, with the current transistor type ignition device, the ignition energy shortage occurs when the battery of the power supply voltage is disconnected and only the generator output is obtained. In order to solve this problem, the problem is to solve the shortage of ignition energy by adding the energy using the subcoil when the energization energy is insufficient and the energization energy is insufficient while the generator output waveform is generated. It is said.
[0006]
[Means for Solving the Problems]
In order to eliminate the shortage of energy in the ignition coil when the battery is open, the required time is secured by adjusting the energization time to the ignition coil based on the current flowing through the ignition coil when the battery is connected, and the current is extremely short When this occurs, it is possible to ignite only with an AC output in any state by adding energy adding means or voltage boosting means (converter).
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The first aspect of the present invention is a transistor for igniting an engine by generating a kick voltage in an ignition coil (IGN coil) by using a voltage generated by a battery or a power generation coil as a power supply source and controlling the transistor on and off by a signal from a control circuit. In the type ignition device, the control circuit includes battery open detection means, ignition timing control means, and energization time control means, and the phase of the generator coil is within a range of time for energizing the IGN coil and time for obtaining the ignition timing. And the energy can be supplied to the IGN coil only by the output of the power generation coil.
[0008]
As shown in FIG. 2, the second feature of the present invention is the state of the power supply waveform of the power supply source using the direct current level when the battery is connected and the charging time difference between the two inputs for detecting the pulsating flow when the battery is open. The battery open detection means adapted to discriminate the above is used.
[0009]
As shown in FIG. 1, the third feature of the present invention is that energy adding means is provided in the IGN coil, and the energy adding means is operated when the energization current detection signal is a predetermined value.
[0010]
As shown in FIG. 6, the fourth feature of the present invention is that the voltage generated by the battery or the power generation coil is used as a power supply source, and the transistor is turned on and off by the control circuit signal to control the kick voltage to the ignition coil (IGN coil). A transistor-type ignition device for generating an engine and igniting an engine, comprising: a battery open detection means; a control circuit having an ignition timing control means and an energization time control means; and a DC-DC converter connected to the power supply source When open, the converter is operated through the control circuit to adjust the energization time to the IGN coil.
[0011]
【Example】
FIG. 1 is a circuit diagram of an embodiment of the present invention. In the figure, 1 is a generator, 1a is a device for rectifying an AC voltage waveform of the generator to obtain a DC voltage. A battery 1b charges the AC voltage output from the generator through the REG RECT and simultaneously supplies the DC voltage to the control circuit and the 12 ignition coils. A waveform shaping circuit 2 shapes the output generated from the ignition timing coil. Reference numeral 3 denotes an ignition timing calculation circuit for calculating a required ignition timing based on the waveform shaping timing. An energization time control circuit 4 controls the start of the energization time required for supplying energy to the ignition coil. Reference numeral 5 denotes an F / F circuit for starting conduction (ON) of the transistor Q1 with the output of the energization time control circuit 4 and stopping conduction (OFF) with the output of the ignition timing circuit 3. Reference numeral 6 denotes a current detection circuit that detects a current value when the ignition coil is energized. A battery open detection circuit 7 detects whether the battery is connected as a power source or in an open state. 8 is a backup coil addition circuit that determines whether or not the backup coil L1 is connected in parallel with the primary coil of the ignition coil. Reference numeral 9 denotes a switching circuit for connecting the backup coil L1 in parallel with the primary coil of the ignition coil by the output of the backup coil adding circuit 8.
[0012]
2 is a battery open detection circuit applied to the present invention, FIG. 3, FIG. 4 and FIG. 5 are operation waveform diagrams of each part for explaining an embodiment of the present invention, FIG. 3 is a battery open detection operation waveform diagram, and FIG. FIG. 5 is an operation waveform diagram of energization control.
[0013]
Next, in order to operate this, first, in a normal use state where the battery 1b is connected, the power supply voltage has a substantially constant voltage with respect to the rotation speed. The time corresponding to the number of revolutions is calculated at 4 based on the waveform shaped waveform, and the time for starting energization of the transistor Q1 is determined, the F / F circuit of 5 is set, and the transistor Q1 is energized. Next, the number of revolutions or time of one revolution is calculated based on the waveform shaped waveform of 2, the ignition timing corresponding to the number of revolutions is determined, the F / F circuit of 5 is reset, and the transistor Q1 is energized To cancel. This ignites the engine through the IGN coil. Thus, with a stable power supply voltage, constant energy can always be stored on the primary side of the IGN coil only by energization time control with respect to the rotational speed.
[0014]
Next, when battery detachment is detected by the battery open detection circuit 7 when the battery is in an open state, the maximum energization time for conducting the transistor Q1 as shown in FIG. Tduty value. From this state, the energization time control 4 is operated within this range. This method will be described based on energization control when the battery is opened in FIG.
[0015]
First, FIG. 3 shows a power supply voltage waveform in which the battery is disconnected from the state where the battery is connected to the input power supply voltage and only the AC output of the generator is obtained. Further, an example of a battery open detection circuit for detecting this state is shown. In the circuit of FIG. 2, the power supply voltage level is detected by U1. Each input of U1 detects (a) voltage at input a, and detects (b) voltage at input ∂b. At this time, the circuit constants are resistors R1, R2, R3, and R4 such that (a) voltage> (b) voltage, and the constants of capacitors C1 and C2 are C1 C2, and a input time constant> b input Time constant. As a result, when the battery is connected, the output waveform of U1 becomes “L”, and when the battery is open, the output waveform of U1 becomes “H”, and the battery open state can be detected. Next, when the battery open state is detected, the timing at which the transistor Q1 is energized can be set to the maximum time at the rising point d of the U1 output. As a result, the operation can be performed in a section (battery open duty) where there is an input power supply that can energize the transistor Q1.
[0016]
Next, in order to control the energization time with respect to this battery open duty interval, if the rising timing α and the falling of the negative waveform of the ignition timing coil in FIG. The section for driving the transistor Q1 in FIG. In this section, the IGN coil is energized and ignited. First, the energization time is determined by detecting the voltage generated in the resistor R3 by the current detection circuit 6 and determining the energization time proportional to this. That is, as shown in FIG. 5, when the transistor Q1 energization current I0 value is large, I1 is energization time t1, and when it is small, I2 is energization time t2, so that the transistor Q1 energization current I0 value is always constant. The energization time is adjusted between α and β so that
[0017]
Further, when the energization time reaches the maximum value α in the α to β section in a high rotation region or the like, the energy is insufficient to store the IGN coil as it is. Therefore, when it is necessary to increase the energization current I0 value further, the transistor Q1 energization current I0 value is increased by connecting the backup coil L1 in parallel with the primary side of the IGN coil via the 8 additional backup coil circuit. At the same time, when the transistor Q1 is OFF, the inductance of the primary side of the IGN coil and the inductance of the backup coil L1 are added, so that the energy generated on the secondary side of the IGN coil also increases. As a result, since the same relationship between the energization current and the energization time is established at the same time, the energization time can be adjusted again in the α to β intervals so that the transistor Q1 energization current I0 value becomes constant again.
[0018]
FIG. 6 is a circuit diagram of another embodiment of the present invention, in which 10 is a DC-DC converter for boosting, FIG. 7 is a circuit example of the converter 10, 1 is an oscillator, 2 is a charge voltage detection circuit, and T1 is A step-up transformer, D1 is a rectifier diode, and C1 is a power supply smoothing capacitor. That is, in this circuit, even when the power source is in the battery open state and only the AC output of the generator is generated, the necessary power source voltage can always be ensured by boosting the voltage via the DC-DC converter to the DC high voltage. Furthermore, by supplying this to the IGN coil as a power source, the energization time can be shortened, and the ignition energy required for engine operation can be secured in the energization time in the AC output generation section of the generator.
[0019]
【The invention's effect】
The present invention can prevent the shortage of required energy for ignition even when the energization section is narrowed because the power supply system has only the AC output of the generator when the battery is open.
[Brief description of the drawings]
[Fig. 1] One embodiment of the present invention [Fig. 2] Battery open detection circuit applied to the embodiment of the present invention [Fig. 3] Battery open detection operation waveform of the present invention [Fig. 4] Battery open operation waveform of the present invention [Fig. Fig. 5 Current control operation waveform Fig. 6 Other embodiment of the present invention Fig. 7 Converter applied to another embodiment of the present invention Fig. 8 Example of conventional transistor type ignition device Fig. 9 Current interruption Ignition waveform during operation
Fig. 10 Ignition waveform diagram when current is interrupted (when battery is open)
[Brief description of symbols]
DESCRIPTION OF SYMBOLS 1 Generator 1a Rectification voltage regulator 1b Battery 2 Waveform shaping circuit 3 Ignition timing control circuit 4 Energization time control circuit 5 F / F circuit (flip-flop)
6 Current detection circuit 7 Back-open detection circuit 8 Battery up coil addition circuit 9 Switching circuit 10 Control circuit 11 Converter circuit 12 Ignition (IGN) coil Q1 Transistor

Claims (4)

As power source voltage generated in the battery or generator coils, on transistor by a signal of the control circuit, and off control to generate a kick voltage to the ignition coil (IGN coils), in a transistor-type ignition device for igniting the engine, said The control circuit includes a battery open detection means, which uses the difference between the DC level when the battery is connected and the charging time of the two inputs for detecting the pulsating current when the battery is open. A transistor type ignition device configured to discriminate a state of a power supply waveform . In a transistor-type ignition device that uses a generated voltage of a battery or a power generation coil as a power supply source, controls a transistor to be turned on and off by a signal of a control circuit, generates a kick voltage in an ignition coil (IGN coil), and ignites an engine. The control circuit includes an energization time control unit, and the energization time control unit controls the conduction timing of the transistor at the next cycle based on the energization current detection signal to the IGN coil at the previous cycle of the power generation coil. A transistor type ignition device characterized by being configured as described above . The control circuit includes an energization time control unit, and the energization time control unit controls the conduction timing of the transistor in the next cycle based on an energization current detection signal to the IGN coil at the previous cycle of the power generation coil. 2. The transistor type ignition device according to claim 1, wherein the transistor type ignition device is configured as described above . 4. The transistor type ignition device according to claim 2 , wherein an energy adding means is provided in the IGN coil, and the energy adding means is operated when the energization current detection signal is a predetermined value.

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