CN108005831B - High-precision ignition system - Google Patents
High-precision ignition system Download PDFInfo
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- CN108005831B CN108005831B CN201711086315.2A CN201711086315A CN108005831B CN 108005831 B CN108005831 B CN 108005831B CN 201711086315 A CN201711086315 A CN 201711086315A CN 108005831 B CN108005831 B CN 108005831B
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- 238000001914 filtration Methods 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 30
- 238000004146 energy storage Methods 0.000 claims description 14
- 230000006698 induction Effects 0.000 claims description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 3
- 230000005389 magnetism Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
The invention discloses a high-precision ignition system which comprises a trigger signal filtering processing module, a first trigger signal A, a second trigger signal B and a third trigger signal C, wherein the trigger signal filtering processing module is used for sequentially transmitting the first trigger signal A, the second trigger signal B and the third trigger signal C to an MCU (microprogrammed control Unit); the waveform interval time of the adjacent first trigger signals A is the time value T required by the flywheel to rotate for 360 degrees; the waveform interval time of the first trigger signal B and the second trigger signal C is a time value t required when the flywheel rotates by N degrees. The invention obtains the instantaneous rotating speed of the flywheel before ignition through a calculation mode of t, and the ignition delay value obtained through t is closer to the actual required value, thereby realizing the high-precision design of the ignition angle, and controlling the precision of the actual ignition angle to +/-1 degree on the engine.
Description
Technical Field
The invention relates to a high-precision ignition system which is applied to small internal combustion gasoline engines, such as lawn mowers, brush cutters, hedge trimmers, chain saws and the like in the field of garden tools.
Background
The digital igniter for the traditional small gasoline engine adopts the MCU as a core control unit to provide a proper ignition signal for the normal work of the gasoline engine, and the output moment of the ignition signal is obtained by recalculating the periodic value of one circle of rotation of the magnetic flywheel. The ignition moment obtained by the method can meet the requirement when the engine runs at high speed, but when the gasoline engine runs at the starting and idling conditions, the change of the rotating speed of the gasoline engine is large, the speed difference of different positions in the period process of one rotation of the magnetic flywheel is large, because the gasoline engine comprises the compression of the mixed gas in the cylinder in the working process, the rotating speed of the magnetic flywheel is sharply reduced in the compression process, the ignition moment calculated after one rotation of the magnetic flywheel cannot meet the optimal ignition moment required by the engine, the deviation of the ignition moment output by the ignition device is large, the up-and-down fluctuation of the rotating speed of the engine at the idling is large, and the adverse condition of engine recoil caused by the inaccurate ignition moment in the starting process is avoided.
Disclosure of Invention
The invention provides a high-precision igniter system of a small gasoline engine to overcome the defects of the prior art, and the high-precision igniter system can reach the precision value of the actual ignition angle +/-1 degree of an engine.
In order to achieve the purpose, the invention adopts the following technical scheme: a high precision ignition system comprises
The trigger signal filtering processing module is used for sequentially transmitting a first trigger signal A, a second trigger signal B and a third trigger signal C to the MCU;
the waveform interval time of the adjacent first trigger signals A is the time value T required by the flywheel to rotate for 360 degrees;
the waveform interval time of the second trigger signal B and the third trigger signal C is a time value t required when the flywheel rotates by N degrees.
Further, still include power module, it samples the energy storage through the voltage waveform of charging coil induction, provides the mains voltage of normal during operation for MCU.
Further, the device also comprises a charging control module, which is used for adjusting the voltage value transmitted to the MCU by the charging coil when the rotating speed of the flywheel reaches a preset value M.
Further, the voltage waveform of charging coil induction includes first waveform and second waveform, and when the flywheel rotational speed was greater than 5000rpm, the charging control module adjusts the charging coil and only responds to the second voltage waveform and take a sample the energy storage.
Further, the ignition energy storage module is used for charging a charging capacitor and comprises a diode D6 and a charging capacitor C3.
Further, the ignition control module comprises a controllable silicon Q1 and is used for controlling the charging and discharging of the charging capacitor C3.
Further, the system comprises an anti-recoil module, and when the phase ratio of T to T does not meet a preset value, the MCU controls the silicon controlled rectifier Q1 to be not conducted.
Further, the power supply module comprises a transistor Q2.
Further, the charging control module comprises a transistor Q3, and a base of the transistor Q2 is connected to a collector of the transistor Q3.
Further, the waveform interval time of the second trigger signal B and the third trigger signal C is a time value t required when the flywheel rotates by 60 °.
In summary, the invention has the following advantages: the invention adopts the trigger module with calculation input, obtains the instantaneous rotating speed of the flywheel before the ignition by the calculation mode of t, and the instantaneous speed is closer to the real rotating speed value before the ignition work than the average speed of the whole circle, so the ignition delay value obtained by the MCU through t is closer to the actual required value, thereby realizing the high-precision design of the ignition angle, and the control precision of the actual ignition angle on the engine is +/-1 degree.
Drawings
Fig. 1 is a schematic view of the mechanical structure of the present invention.
Fig. 2 is a schematic block diagram of the present invention.
FIG. 3 is a circuit diagram of an embodiment of the present invention.
FIG. 4 is a voltage waveform diagram of a reference point according to an embodiment of the present invention.
Fig. 5 is a flowchart illustrating MCU control according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
As shown in FIG. 1, the external mechanical structure of the high-precision ignition system comprises a booster coil group 1, a trigger coil 2, an iron core 3, an MCU control system 4, a charging coil 5, a magnetic flywheel 6 and other common parts of an igniter. The ignition system adopts the MCU as a control core and provides an ignition signal for the work of the engine; when the magnetic flywheel rotates anticlockwise, induced voltage waveforms are generated on the charging coil and the trigger coil through the change of a magnetic field, and the phase of the induced voltage waveforms on the coil corresponds to the position of the actual magnetic pole of the flywheel.
As shown in fig. 2, the MCU control system 4 includes an ignition energy storage module, an ignition control module, an anti-recoil module, a trigger signal filtering processing module for providing calculation control for the MCU, a signal acquisition module, an operation module, an output control module, a power supply module for providing a working power supply for the MCU, and a charging control module for adjusting a voltage value for the MCU.
Specifically, the trigger signal filtering processing module comprises a trigger coil and is used for sequentially transmitting a first trigger signal A, a second trigger signal B and a third trigger signal C to the MCU;
the waveform interval time of the adjacent first trigger signals A is the time value T required by the flywheel to rotate for 360 degrees;
the waveform interval time of the second trigger signal B and the third trigger signal C is a time value t required when the flywheel rotates by N degrees.
The design of an independent trigger coil can ensure that an input signal entering the MCU is more accurate, improve the phase offset of the simultaneous power supply VDD irradiation on the traditional circuit, and provide an accurate reference for the MCU to control high-precision ignition control.
And the power supply module samples and stores energy through the voltage waveform induced by the charging coil and provides power supply voltage for the MCU during normal work. In this embodiment, the voltage waveform of charging coil induction includes first waveform and second waveform, and when the flywheel rotational speed was greater than 5000rpm, the charging control module adjusted the charging coil and only responded to the second voltage waveform and samples the energy storage.
And the charging control module is used for adjusting the voltage value transmitted to the MCU by the charging coil when the rotating speed of the flywheel reaches a preset value M.
Voltage waveform sampling energy storage through the induction of the charging coil provides the VDD that MCU normally works, because the voltage energy of the induction of the charging coil is strong, can guarantee that the magnetic flywheel can generate enough voltage to ensure the normal work of MCU when the lower speed is rotatory. Simultaneously when magnetism flywheel high speed is rotatory (the flywheel rotational speed is greater than 5000 rpm), the voltage of charging coil induction is enough VDD's normal work completely this moment, MCU adjusts the voltage value of charging coil to VDD through charging control module, can make partial energy of charging coil induction be used for the sample energy storage, experimental data shows, through the setting of adjusting charging control module when magnetism flywheel high speed is rotatory, can promote 10% with the ignition energy that the high-pressure side produced, promote the ignition performance.
The ignition energy storage module charges a charging capacitor and comprises a diode D6 and a charging capacitor C3.
The ignition control module comprises a controllable silicon Q1 and is used for controlling the charging capacitor C3 to charge and discharge.
And when the phase ratio of T to T does not meet a preset value, the MCU controls the silicon controlled rectifier Q1 to be not conducted.
Specifically, the trigger signal filtering processing module includes a trigger coil, and two ends of the trigger coil are respectively connected to the MCU.
FIG. 4 is a schematic circuit diagram of an MCU control system according to an embodiment of the present invention;
the ignition control module comprises resistors R6 and R7 and a silicon controlled rectifier Q1;
the ignition energy storage module comprises a charging coil, diodes D5 and D6 and a capacitor C3;
the power supply module comprises resistors R8, R9, R10 and R13, a triode Q2, diodes D7, D8 and D9, and capacitors C4 and C5;
the trigger signal filtering processing module comprises a trigger coil, diodes D1, D2, D3 and D4, resistors R1, R2, R4 and R5, and capacitors C1 and C2;
the charging control module comprises resistors R11 and R12 and a triode Q3;
one end of the charging coil is connected with the negative electrode of D5 and the positive electrode of D6 respectively, the positive electrode of D5 is grounded, the negative electrode of D6 is connected with the anode of a thyristor Q1 and one end of a capacitor C3, the control electrode of Q1 is connected with one ends of resistors R6 and R7 respectively, the cathode of the thyristor and the other end of a resistor R7 are grounded together, and the other end of R6 is connected with a GP0 pin of the MCU.
The other end of the charging coil is respectively connected to the negative electrode of D7, the C pole of Q2 and one end of R8, the other end of R8 is respectively connected to one end of R9 and one end of R10, the other end of R9 is grounded, and the other end of R10 is respectively connected to the B pole of Q2 and the C pole of Q3; the B pole of Q3 is respectively connected with one end of R11 and one end of R12, and the other end of R12 and the E pole of Q3 are grounded; one end of R11 is connected with GP4 port of MCU, E pole of Q2 is connected with anode of D8, cathode of D8 is connected with anode of C4 and one end of R13; the other end of R13 is connected with the negative electrode of D9, one end of C5 and the VDD port of MCU, and the other ends of C4, C5 and D9 are grounded.
One end of the trigger coil is connected to the negative electrode of D1 and one end of R1, and the other end of R1 is respectively connected to one end of R2 and C1, the negative electrode of D3 and the GP5 port of the MCU; the positive electrode of D1, the positive electrode of D3, the other end of R2 and the other end of C1 are all grounded;
the other end of the trigger coil is respectively connected to the negative electrode of D2 and one end of R4, the other end of R4 is respectively connected to one end of R5, one end of C2, the negative electrode of D4 and the GP1 port of the MCU, and the positive electrode of D2, the positive electrode of D4, the other end of R5 and the other end of C2 are all grounded.
The specific working process and principle are as follows:
and ensuring the normal work of the MCU.
The point b of the charging coil is also induced with the rotation of the magnetic pole position of the flywheel, and the forward voltage is shaped by a diode D5 and stored on an ignition capacitor C3 through a diode D6; meanwhile, a voltage waveform is induced at the point C of the trigger coil, after the voltage waveform is rectified by a rectifier diode D2, the first voltage signal A is input into GP1 of the MCU through a filter processing circuit consisting of R4, R5, C2 and D4, and the MCU acquires the period value T of the current flywheel rotating for one circle according to the waveform interval time of the adjacent first voltage signal (Wave A in the figure) sampled by one circle of rotation of the flywheel;
GP1 induces wave A first, and induces a third voltage signal (wave C in the figure) along with the rotation of the flywheel magnetic pole position; with the rotation of the flywheel, a second voltage signal B in a positive direction is also induced at the point d of the trigger coil, and the second voltage signal B is input to a GP5 pin (Wave B in the figure) of the MCU after being rectified and filtered.
The MCU obtains a time value t according to the interval between the received input signals Wave B and Wave C, then the MCU calculates and obtains the correct ignition requirement time according to the ignition angle requirement set by a program by using the t, when the ignition delay time timed in the MCU reaches, the MCU outputs an ignition control signal through GP0, the Q1 is controlled to be conducted through resistors R6 and R7, at the moment, the electric energy stored on the capacitor C3 is released instantly, the instant current changes, and high voltage is generated for ignition through the boosting coil group, so that the engine works.
Wherein by the control module that charges that resistance R11, R12 and triode Q3 constitute, when flywheel rotational speed is lower, MCU's GP4 mouth output low level signal makes Q3 not switch on, and two voltage waveforms of charging coil a point response are passed through Q2 and are input to C4 energy storage, and MCU has sufficient voltage VDD when guaranteeing the low-speed, guarantees that MCU reliably works.
When the MCU identifies that the rotating speed is greater than 5000RPM, because the VDD voltage of the MCU is enough to ensure the normal work of the MCU, the GP4 outputs a high-level control signal (see GP4 waveform of figure 3) in advance at the moment, and the triode Q3 is controlled to be conducted through the resistors R11 and R12, so that the triode Q2 is turned off; therefore, after the inductive waveform of the point a of the charging coil arrives, because the triode Q2 is in a turn-off state, the C4 is not charged for energy storage, the inductive voltage of the point a of the coil is not connected with a load circuit of the charging C4 any more, so that the inductive waveform of the point a is in a no-load state, the amplitude of the inductive voltage is increased, the voltage amplitude of the inductive point b of the corresponding charging coil is also increased, the electric energy stored in the capacitor C3 is increased, and finally the high-speed ignition energy can be increased by about 10%.
After the first response waveform of charging coil a point, MCU passes through GP4 output low level control signal, cuts off triode Q3 to can charge electric capacity C4 through Q2 control by the follow-up induced voltage of charging coil a point, guarantee the normal operating voltage of MCU.
The T represents the time required for the flywheel to rotate for one circle by 360 degrees, the T represents the time required for the trigger coil to rotate the magnetic pole on the flywheel from the N pole to the S pole, and the N degree of the mechanical rotation angle from the N pole to the S pole is generally about 60 degrees, there is a real mechanically phase ratio of T and T, such as 60 °/360 ° =1/6, when the flywheel is decelerated severely during the intake compression stroke, the instantaneous speed drop is severe, the value of t is increased, therefore, the ratio of the current instantaneous rotating speed of the flywheel to the T is increased, the MCU can identify whether the current instantaneous rotating speed of the flywheel is rapidly reduced or not and the reduction amplitude by comparing the time ratio of the current instantaneous rotating speed of the flywheel to the T, thus, the anti-kickback program setting is started, and the ignition output is not performed through the ignition control port GP0, thereby preventing abnormal ignition in the case where the flywheel is not rotated normally.
Compared with the traditional circuit, the invention separately designs a power supply circuit for providing VDD for the MCU and a trigger circuit for providing the calculation input.
According to the invention, the voltage waveform induced by the charging coil is used for sampling and storing energy to provide the VDD for normal work of the MCU, and because the voltage energy induced by the charging coil is strong, the magnetic flywheel can be ensured to generate enough voltage to ensure the normal work of the MCU when rotating at a lower speed. Meanwhile, when the magnetic flywheel rotates at a high speed, the charging induced voltage is completely enough for the normal work of VDD, and at the moment, the MCU controls the on-off of the triode Q3 through GP4 to adjust the voltage value from the charging coil to VDD;
through the closing charging of control Q2, can make the energy of charging coil induction be used for producing high-pressure ignition through electric capacity C3 energy storage, experimental data shows that, the regulation setting through MCU GP4 when the magnetism flywheel is high-speed rotatory can promote 10% with the ignition energy that the high-pressure side produced, promotes the ignition performance.
Meanwhile, due to the design of the independent trigger coil, the input signal entering the MCU can be ensured to be more accurate, the phase deviation of the VDD irradiation of the traditional circuit in which power is supplied simultaneously is improved, and an accurate reference is provided for the MCU to control high-precision ignition control.
The design of the control circuit is matched, so that the good low-speed performance of the igniter can be ensured, the low-speed starting performance of the engine is improved, and meanwhile, the idling stability of the engine can be ensured through the high-precision ignition angle.
It is to be understood that the described embodiments are merely a subset of the embodiments of the invention, and not all embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (4)
1. A high precision ignition system characterized by: comprises that
The trigger signal filtering processing module is used for sequentially transmitting a first trigger signal A, a second trigger signal B and a third trigger signal C to the MCU;
the waveform interval time of the adjacent first trigger signals A is the time value T required by the flywheel to rotate for 360 degrees;
the waveform interval time of the second trigger signal B and the third trigger signal C is a time value t required when the flywheel rotates by N degrees;
the power supply module is used for sampling and storing energy through the voltage waveform induced by the charging coil and providing power supply voltage for the MCU during normal work;
the ignition energy storage module charges a charging capacitor and comprises a charging coil, a diode D5, a diode D6 and a capacitor C3;
the ignition control module is used for controlling the charging capacitor C3 to charge and discharge; the ignition control module comprises a resistor R6, a resistor R7 and a silicon controlled rectifier Q1; the charging capacitor C3 is controlled to be charged and discharged;
the power supply module comprises a resistor R8, a resistor R9, a resistor R10, a resistor R13, a triode Q2, a diode D7, a diode D8, a diode D9, a capacitor C4 and a capacitor C5;
the trigger signal filtering processing module comprises a trigger coil, a diode D1, a diode D2, a diode D3, a diode D4, a resistor R1, a resistor R2, a resistor R4, a resistor R5, a capacitor C1 and a capacitor C2;
the charging control module is used for adjusting a voltage value transmitted to the MCU by the charging coil when the rotating speed of the flywheel reaches a preset value M, and comprises a resistor R11, a resistor R12 and a triode Q3;
one end of the charging coil is respectively connected with the cathode of the diode D5 and the anode of the diode D6, the anode of the diode D5 is grounded, the cathode of the diode D6 is connected with the anode of the thyristor Q1 and one end of the capacitor C3, the control electrode of the thyristor Q1 is respectively connected with one ends of the resistor R6 and the resistor R7, the cathode of the thyristor and the other end of the resistor R7 are grounded together, and the other end of the resistor R6 is connected with the GP0 pin of the MCU;
the other end of the charging coil is respectively connected to the negative electrode of the diode D7, the C pole of the triode Q2 and one end of the resistor R8, the other end of the resistor R8 is respectively connected to one end of the resistor R9 and one end of the resistor R10, the other end of the resistor R9 is grounded, and the other end of the resistor R10 is respectively connected to the B pole of the triode Q2 and the C pole of the triode Q3; the B pole of the triode Q3 is respectively connected with one end of the resistor R11 and one end of the resistor R12, and the other end of the resistor R12 and the E pole of the triode Q3 are grounded; one end of the resistor R11 is connected with a GP4 port of the MCU, the E pole of the triode Q2 is connected with the anode of the diode D8, and the cathode of the diode D8 is respectively connected with the anode of the capacitor C4 and one end of the resistor R13; the other end of the resistor R13 is respectively connected with the cathode of the diode D9, one end of the capacitor C5 and the VDD port of the MCU, and the other ends of the capacitor C4, the capacitor C5 and the diode D9 are grounded;
one end of the trigger coil is connected to the cathode of the diode D1 and one end of the resistor R1, and the other end of the resistor R1 is connected to the resistor R2, one end of the capacitor C1, the cathode of the diode D3 and the GP5 port of the MCU respectively; the anode of the diode D1, the anode of the diode D3, the other end of the resistor R2 and the other end of the capacitor C1 are all grounded; the other end of the trigger coil is respectively connected to the cathode of the diode D2 and one end of the resistor R4, the other end of the resistor R4 is respectively connected to one end of the resistor R5, one end of the capacitor C2, the cathode of the diode D4 and the GP1 port of the MCU, and the anode of the diode D2, the anode of the diode D4, the other end of the resistor R5 and the other end of the capacitor C2 are all grounded.
2. A high precision ignition system as defined in claim 1 wherein: the voltage waveform of charging coil induction includes first waveform and second waveform, and when the flywheel rotational speed was greater than 5000rpm, the charging control module adjusts the charging coil and only responds to the second voltage waveform and take a sample the energy storage.
3. A high precision ignition system as defined in claim 1 wherein: the anti-recoil control circuit further comprises an anti-recoil module, and when the phase ratio of T to T does not meet a preset value, the MCU controls the silicon controlled rectifier Q1 to be not conducted.
4. A high precision ignition system as defined in claim 1 wherein: the waveform interval time of the second trigger signal B and the third trigger signal C is the time value t required when the flywheel rotates by 60 degrees.
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| CN201711086315.2A CN108005831B (en) | 2017-11-07 | 2017-11-07 | High-precision ignition system |
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| CN201711086315.2A CN108005831B (en) | 2017-11-07 | 2017-11-07 | High-precision ignition system |
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| CN108005831B true CN108005831B (en) | 2021-04-09 |
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| CN110630424B (en) * | 2019-09-11 | 2021-06-18 | 浙江锋龙电气股份有限公司 | High-precision ignition system with double trigger coils and method |
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| CN1690407A (en) * | 2004-04-28 | 2005-11-02 | 沃尔布罗发动机使用有限责任公司 | Capacitor discharge ignition |
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| US7506634B2 (en) * | 2006-09-27 | 2009-03-24 | Keterex, Inc. | Ignition timing circuit |
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| CN108005831A (en) | 2018-05-08 |
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Denomination of invention: A high-precision ignition system Effective date of registration: 20230426 Granted publication date: 20210409 Pledgee: Bank of China Limited Shangyu sub branch Pledgor: ZHEJIANG FENGLONG ELECTRICAL MACHINERY Co.,Ltd. Registration number: Y2023980039143 |
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