JP2005264732A - Capacitor discharge type internal combustion engine ignition method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a capacitor discharge type internal combustion engine ignition device capable of improving startability even in a soft ignition type internal combustion engine. <P>SOLUTION: The capacitor discharge type internal combustion engine ignition device is equipped with a magnet type generator 1 driven by an internal combustion engine, a capacitor 6 for ignition charged by a positive pulse of a source coil 5 in the magnet type generator 1, an ignition coil 4, a switching element 7 for discharge for discharging the charge of the capacitor 6 for ignition through the ignition coil 4 by being turned on by an ignition signal, a power circuit 8 for control for converting a negative pulse of the source coil 5 into power for control, and an ignition timing control means 9 which is operated by power for control for computing a rotation cycle of the internal combustion engine by two front and rear pulses on the basis of the pulse of the source coil 5 and providing an ignition signal corresponding to the rotation cycle to the switching element 7 for discharge. The ignition timing control means 9 is equipped with an initial pulse detecting means 91 for detecting an initial pulse after a start of an operation and an initial ignition signal output means 92 for outputting the ignition signal with reference to the initial pulse. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an ignition method and apparatus for a capacitor discharge internal combustion engine.

  As shown in FIG. 5, a capacitor discharge type ignition device for an internal combustion engine includes a magnet generator 1 driven by an internal combustion engine, an ignition coil 4 having a primary coil 2 and a secondary coil 3, and a magnet generator. The ignition capacitor 6 charged via the diodes 11 and 12 by a positive pulse Vp (see FIG. 6) of one source coil 5 and the charge of the ignition capacitor 6 turned on by the ignition signal are A discharge switching element 7 such as a thyristor that discharges through the next coil 2 and a control power supply circuit 8 that is charged by the negative pulses Vn1 and Vn2 (see FIG. 6) of the source coil 5 and converted into a DC control power supply Vcc. And an ignition timing control means 9 that is operated by the control power source Vcc and supplies an ignition signal to the discharge switching element 7 at an ignition timing corresponding to the rotation cycle of the internal combustion engine. There. The secondary coil 3 of the ignition coil 4 is connected to the spark plug 13. Reference numeral 14 denotes a diode for allowing the negative pulses Vn1 and Vn2 of the source coil 5 to flow.

  The magnet generator 1 includes a rotor 10 fixed to a crankshaft or the like of an internal combustion engine, a permanent magnet provided on the outer peripheral side of the rotor 10, a source coil 5 provided on the stator side, and the like. At each rotation, the source coil 5 generates the pulses Vn1, Vn2, and Vp in the order of a negative half-wave pulse Vn1, a positive half-wave pulse Vp, and a negative half-wave pulse Vn2, as shown in FIG. To do. A control power supply circuit 8, an ignition timing control means 9 and the like are connected to the winding start side of the source coil 5.

  When a positive pulse Vp is generated in the source coil 5 at the time of ignition of the internal combustion engine, a charging current flows through the diode 11, the ignition capacitor 6, the primary coil 2 of the ignition coil 4, and the diode 12 by this pulse Vp. The ignition capacitor 6 is charged by the current. After that, the ignition timing control means 9 outputs an ignition signal at a predetermined ignition timing, the discharge switching element 7 is turned on by the ignition signal, and the charge of the ignition capacitor 6 is discharged to the discharge switching element 7, the ignition coil 4 is discharged through the primary coil 2, and a high-pressure pulse generated in the secondary coil 3 of the ignition coil 4 is applied to the spark plug 13.

  In recent internal combustion engine ignition devices, in order to meet the demands of exhaust gas purification, fuel efficiency improvement, etc., a soft ignition system using a microcomputer that can easily control the ignition timing according to complicated ignition control characteristics is considered. Yes. As a method in this case, conventionally, there are a single method of soft ignition in which the ignition timing control means 9 is configured by a microcomputer to control the ignition timing in software, and a combined method in which hard ignition and soft ignition are used in combination.

The single method adopts the soft ignition method for the entire rotation range of the internal combustion engine, whereas the combined method controls the ignition timing in a slow speed range such as at the start time when the rotation speed of the internal combustion engine is very slow, for example. Hard ignition is performed, and soft ignition in which the ignition timing is controlled softly in a rotation range other than the slow rotation range (Patent Document 1).
JP 2003-13829 A

  When starting the internal combustion engine, it is assumed that pulses of the first rotation, the second rotation, the third rotation,... Are generated in the source coil 5 at time intervals as shown in FIG. . When the output waveform of the source coil 5 is shaped so as to fall when the positive pulse Vp is generated in the source coil 5, the input signal waveform on the upstream side of the ignition timing control means 9 is as shown in FIG. As shown in FIG. 4, pulses P1, P2, P3,... Are sequentially generated corresponding to the positive pulse Vp after each rotation. When a positive pulse Vp is generated in the source coil 5, the ignition capacitor 6 is sequentially charged as shown in FIG.

  As shown in the flowchart of FIG. 8, the ignition timing control means 9 sequentially detects each pulse of the input signal waveform (step S1), and starts from the two front and rear pulses P2, P3, P3, P4. The rotation periods T1, T2,... For each rotation are calculated (step S2). Then, referring to a data table in which the ignition timing is predetermined for each rotation period in accordance with predetermined ignition control characteristics (step S3), the data closest to the rotation periods T1, T2,. The data is corrected in accordance with the rotation periods T1, T2,... (Step S4), and the ignition timing t1 from the falling point of each pulse P3, P4,. , T2... Are calculated and ignition signals p1, p2... Are output to the discharge switching element 7 at the ignition timings t1, t2.

  Then, the discharge switching element 7 is turned on by the ignition signals p1, p2,... From the ignition timing control means 9, and the charge of the discharge capacitor 6 is transferred to the primary of the ignition coil 4 as shown in FIG. It discharges through the coil 2 (refer FIG.7 (E)). For this reason, after the internal combustion engine is started, the ignition timing of the internal combustion engine can be controlled based on predetermined ignition control characteristics.

  On the other hand, the control power supply circuit 8 is charged with capacitors by negative pulses Vn1 and Vn2 generated in the source coil 5, and the ignition timing control means 9 operates with the DC voltage as the control power supply Vcc. However, when the pulse P1 of the first rotation of the internal combustion engine is generated, charging is performed only by the negative pulse Vn1 of the source coil 5 and the power supply voltage of the control power supply circuit 8 is not sufficiently increased. The timing control means 9 is not operating as shown in FIG. Therefore, the ignition timing control means 9 cannot detect the first rotation pulse P1.

  Then, when the internal combustion engine is rotated once and the control power supply circuit 8 is charged by two negative pulses Vn1 and Vn2 before and after the voltage of the control power supply Vcc rises to the operating voltage of the microcomputer, the control is performed. The ignition timing control means 9 starts operating by the power source Vcc.

  Further, the ignition timing control means 9 detects the two pulses P2, P3, P3, P4,... And calculates the rotation cycles T1, T2,. Even if the pulse P2 after the start of operation is input as the initial pulse Ps, the ignition signal is not output based on the initial pulse Ps. Then, at the third rotation of the internal combustion engine, the rotation cycle T1 of the internal combustion engine can be calculated from the previous initial pulse ps (P2) and the current pulse P3, and the ignition timing control means 9 outputs the ignition signal p1, Thereafter, the output of ignition signals p2, p3.

  Therefore, in the case of the single system of soft ignition, the ignition timing control means 9 outputs the ignition signal p1 at the second rotation of the internal combustion engine after the start of the operation at the earliest (third rotation from the start of the rotation of the internal combustion engine). It becomes. For this reason, since the ignition is not performed unless the internal combustion engine rotates at least three times, there is a disadvantage that the starting performance is lowered as compared with the hard ignition system.

  Further, in the case of the combined system, the hard ignition system is used in the very low speed rotation region where the rotational speed of the internal combustion engine is very low, so that the problem of deterioration in starting performance unlike the single system does not occur. However, in addition to the ignition timing control means 9 made by the microcomputer, it is necessary to provide an ignition timing control means having a hard circuit configuration for outputting an ignition signal in the slow speed rotation range, which makes the overall configuration of the ignition device very complicated and manufactured. There are drawbacks such as an increase in cost and an increase in the size of the apparatus.

  An object of the present invention is to provide an ignition method and apparatus for a capacitor discharge internal combustion engine that can improve the starting performance of the internal combustion engine even with a soft ignition system.

  The ignition method for an internal combustion engine of the present invention includes a step of charging the ignition capacitor 6 by a positive pulse of the source coil 5 of the magnet generator 1 driven by the internal combustion engine, and turning on the discharge switching element 7 by the ignition signal. Then, the pulse of the source coil 5 is discharged by the step of discharging the charge of the ignition capacitor 6 through the ignition coil 4 and the ignition timing control means 9 operated by the control power source converted from the negative pulse of the source coil 5. And calculating the rotation period of the internal combustion engine from the two front and rear pulses, and giving an ignition signal to the discharge switching element 7 at the ignition timing corresponding to the rotation period, and starting the operation of the ignition timing control means 9 And a step of detecting a subsequent initial pulse and providing an ignition signal to the discharge switching element 7 based on the initial pulse.

  The ignition device for an internal combustion engine of the present invention includes a magnet generator 1 driven by the internal combustion engine, an ignition capacitor 6 charged by a positive pulse of a source coil 5 of the magnet generator 1, and an ignition coil. 4, a discharge switching element 7 that is turned on by an ignition signal and discharges the charge of the ignition capacitor 6 through the ignition coil 4, and a control power source that converts a negative pulse of the source coil 5 into a control power source The circuit 8 is operated by the control power source, and the rotation cycle of the internal combustion engine is calculated by two pulses before and after the pulse of the source coil 5, and the ignition signal corresponding to the rotation cycle is discharged. Ignition timing control means 9 to be applied to the switching element 7 for ignition, the ignition timing control means 9 includes an initial pulse detection means 91 for detecting an initial pulse after the start of operation, Those having an initial ignition signal output means 92 for outputting the ignition signal based on the sync pulse.

  The initial ignition signal output means 92 may have a function of setting the rotation cycle data corresponding to the starting rotational speed of the internal combustion engine and outputting the ignition signal when the initial pulse is detected. The ignition timing control means 9 is a microcomputer and may have an initial pulse determination loop in the pulse detection loop. The rotation cycle data is fixed value data.

  According to the present invention, since the ignition signal can be output with the initial pulse Ps after the operation of the ignition timing control means 9 is started, the starting performance of the internal combustion engine can be improved even with soft ignition. Therefore, it is possible to adopt a single system of soft ignition, which makes it possible to simplify the configuration as compared with the conventional combined system, and to avoid an increase in manufacturing cost and an increase in the size of the apparatus.

  Embodiments of the present invention will be described below in detail with reference to the drawings. In addition, about the same name thing as the past, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  1-4 illustrate a first embodiment of the present invention. The capacitor discharge type internal combustion engine ignition device shown in FIG. 1 employs a soft ignition type single system, and a magnet generator 1 driven by the internal combustion engine and the source coil 5 of the magnet generator 1 are positively connected. The ignition capacitor 6 charged by the pulse Vp, the ignition coil 4, the discharge switching element 7 that is turned on by the ignition signal and discharges the charge of the ignition capacitor 6 through the ignition coil 4, and the negative of the source coil 5 Of the internal combustion engine based on the positive pulse Vp of the source coil 5 operated by the control power supply Vcc and the control power supply circuit 8 for converting the pulses Vn1 and Vn2 of the internal combustion engine to the control power supply Vcc. Is calculated, and ignition signals p1, p2,... Are applied to the discharge switching element 7 at ignition timings t1, t2,. And a control unit 9.

  The ignition timing control means 9 is composed of a microcomputer or the like, and calculates the rotation periods T1, T2,... Of the internal combustion engine as described above, and the ignition timing t1 corresponding to the rotation periods T1, T2,. , T2,..., An ignition timing control function for giving the ignition signals p1, p2,... To the discharge switching element 7, initial pulse detecting means 91 for detecting the initial pulse Ps after the operation starts, and the initial pulse Ps And an initial ignition signal output means 92 for outputting the ignition signal ps with reference to.

  Next, the operation when starting the internal combustion engine will be described with reference to the flowchart of FIG. 2 and the time chart of FIG. As shown in FIG. 3, the ignition timing control means 9 does not operate at the first rotation of the internal combustion engine due to insufficient voltage of the control power supply Vcc, and starts operation from the second rotation. After starting the operation, the ignition timing control means 9 detects the pulse P in the pulse detection loop as in the prior art (step S1). This pulse detection loop is provided with an initial pulse determination loop, and it is determined whether or not the pulse P detected in the initial pulse determination loop is the initial pulse Ps (step S6). If the pulse is the initial pulse Ps as shown in FIG. 3, data (fixed value data) of a rotation cycle corresponding to a preset starting rotational speed of the internal combustion engine is set as initial data (step S7). It should be noted that the rotation period corresponding to the starting rotational speed may be determined by calculation or the like from the average rotational speed of the internal combustion engine during the recoil operation.

  Next, referring to the data table (step S3), the data closest to the rotation period corresponding to the starting rotational speed is read, and the data is corrected as necessary (step S4), and the initial data is determined. The ignition timing ts is calculated, and the ignition signal ps is output to the discharge switching element 7 at the ignition timing ts (step S5). For example, as shown in FIG. 3, the ignition signal ps is output at the ignition timing ts after a lapse of a predetermined time from the initial pulse Ps, particularly with respect to the falling point thereof. Then, the discharge switching element 7 is turned on by this ignition signal ps, and the charge of the ignition capacitor 6 is discharged through the primary coil 2 of the ignition coil 4.

  Even if the pulses P3, P4,... Are detected sequentially after the third rotation of the internal combustion engine (step S1), it is not determined as the initial pulse Ps at the next step S6, so two pulses Ps before and after the second rotation and thereafter. , P3, P3, P4,..., P1, P2,..., And through the steps S2 to S5, the ignition timings t1, t2,. , The ignition signals p1, p2,... Are output to the discharge switching element 7.

  Accordingly, in this way, the ignition timing control means 9 can output the ignition signal ps based on the initial pulse Ps detected first after the operation starts, so that the two pulses Ps, P3, P3, P4,. ... Is calculated from the internal combustion engine, and ignition signals p1, p2,... According to the length of the rotation periods T1, T2,. In spite of adopting the soft ignition method, if the ignition timing control means 9 is in the operating state, it is possible to start the output immediately from the second rotation of the internal combustion engine and ignite, thereby improving the starting characteristics.

  Further, the ignition signal ps is output after the ignition timing ts after a predetermined time has elapsed from the detection of the initial pulse Ps, and the output timing of the ignition signal ps with respect to the initial pulse Ps is fixed. Since it is in a rotating state and does not require delicate control of the ignition timing, there is no particular problem. Furthermore, compared with the combined method, the configuration is very simple, it can be implemented easily and inexpensively, and the entire apparatus can be downsized.

  When the ignition control method for the internal combustion engine is analyzed step by step, the ignition capacitor 6 is charged by the positive pulse of the source coil 5 of the magnet generator 1 driven by the internal combustion engine as shown in FIG. The charging step 101, the discharge switching element 7 is turned on by the ignition signals ps, p1, p2,..., The electric charge of the ignition capacitor 6 is discharged through the ignition coil 4, and the spark plug 13 is discharged by the discharge. Generated in the source coil 5 and the ignition timing control means 9 operated by the control power source Vcc converted from the negative pulses Vn1 and Vn2 of the source coil 5, and the pulses generated in the source coil 5 after the second rotation of the internal combustion engine The rotation period T1, T2... Of the internal combustion engine is calculated from the two pulses P2 (Ps), P3, P3, P4. The ignition signal output step 104 for giving the ignition signals p1, p2,... To the discharge switching element 7 at the ignition timings t1, t2... Corresponding to the rotation periods T1, T2,. Initial ignition for detecting an initial pulse Ps (P2) based on a pulse Vp first generated in the source coil 5 after the start, and outputting an ignition signal ps in accordance with a rotation period corresponding to the starting rotational speed based on the initial pulse Ps. And a signal output step 105.

  Of the steps S1 to S7 of the ignition timing control means 9, the initial pulse detection means 91 is constituted by steps S1 and S6, and the initial ignition signal output means 92 is constituted by steps S2 to S5 and S7.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to this Example, A various change is possible within the range which does not deviate from the meaning. For example, in the embodiment, the ignition timing control means 9 uses the positive pulse Vp generated by the source coil 5 and generates internal combustion from two pulses P2 (Ps), P3, P3, P4,. The engine rotation periods T1, T2,... Are calculated and the initial pulse Ps is detected. Negative pulses Vn1, Vn2 before or after the source coil 5 is generated for each rotation of the internal combustion engine. Utilizing this, the rotation periods T1, T2,... Of the internal combustion engine may be calculated from the previous pulse and the current pulse based on this, and the initial pulse Ps may be detected.

  In the embodiment, when the ignition signal ps is output based on the initial pulse Ps, the ignition signal ps is output through steps S2 to S5. However, the correction or the like of the data is not performed, but the initial pulse Ps falls or rises. The ignition signal ps may be output after a certain time from the time point.

  Further, in the embodiment, the explanation was made with the soft ignition as a single method, but a combined method using both the hard ignition in the slow rotation region and the soft ignition in the other rotation region may be adopted.

1 is a circuit diagram of an internal combustion engine ignition device showing one embodiment of the present invention. It is a flowchart of the ignition control which shows one Example of this invention. It is a time chart of the ignition control which shows one Example of this invention. It is process drawing of the ignition control method which shows one Example of this invention. It is a circuit diagram of the conventional ignition device for internal combustion engines. It is a voltage waveform diagram of a source coil. It is a time chart of the conventional ignition control. It is a flowchart of the conventional ignition control.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnet type generator 4 Ignition coil 5 Source coil 6 Ignition capacitor 7 Discharge switching element 9 Ignition timing control means 91 Initial pulse detection means 92 Initial ignition signal output means

Claims (5)

  Charging the ignition capacitor (6) with the positive pulse of the source coil (5) of the magnet generator (1) driven by the internal combustion engine, and turning on the discharge switching element (7) with the ignition signal The step of discharging the charge of the ignition capacitor (6) through the ignition coil (4), and the ignition timing control means (9) operated by the control power source converted from the negative pulse of the source coil (5), Calculating a rotation cycle of the internal combustion engine from two front and rear pulses based on the pulse of the source coil (5), and providing an ignition signal to the discharge switching element (7) at an ignition timing corresponding to the rotation cycle; And a step of detecting an initial pulse after the start of the operation of the ignition timing control means (9) and providing an ignition signal to the discharge switching element (7) based on the initial pulse. Ignition method for capacitor discharge type internal combustion engine according to symptoms.   A magnet generator (1) driven by an internal combustion engine, an ignition capacitor (6) charged by a positive pulse of a source coil (5) of the magnet generator (1), and an ignition coil (4) A discharge switching element (7) that is turned on by an ignition signal and discharges the charge of the ignition capacitor (6) through the ignition coil (4), and a negative pulse of the source coil (5) for controlling A control power supply circuit (8) for converting to a power supply, and a rotational cycle of the internal combustion engine which is operated by the control power supply and calculates the rotation cycle of the internal combustion engine by two front and rear pulses based on the pulses of the source coil (5) Ignition timing control means (9) for supplying the ignition signal corresponding to the rotation cycle to the discharge switching element (7), the ignition timing control means (9) detecting an initial pulse after the start of operation Pal And detection means (91), the initial ignition signal output means (92) and capacitor discharge ignition device for an internal combustion engine characterized by comprising a for outputting the ignition signal based on the said initial pulse.   The initial ignition signal output means (92) has a function of setting the rotation cycle data corresponding to the starting rotational speed of the internal combustion engine and outputting the ignition signal when the initial pulse is detected. An ignition device for a capacitor discharge type internal combustion engine according to claim 2.   The ignition device for a capacitor discharge type internal combustion engine according to claim 2 or 3, wherein the ignition timing control means (9) is a microcomputer and has an initial pulse determination loop in a pulse detection loop.   5. The capacitor discharge type internal combustion engine ignition device according to claim 4, wherein the rotation cycle data is fixed value data.

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