CN102996316B - engine ignition control - Google Patents

Abstract

The present invention discloses an engine ignition control device, including: a pulse generator; and a control unit, including a microcontroller and a printed circuit board, wherein the printed circuit board is electrically connected to the microcontroller, wherein the printed circuit board includes a trailing edge signal generating circuit, wherein the trailing edge signal generating circuit is electrically connected to the microcontroller, wherein the trailing edge signal generating circuit includes a bipolar junction transistor, wherein the emitter (E) of the bipolar junction transistor is electrically connected to the pulse generator, the collector (C) of the bipolar junction transistor is electrically connected to the microcontroller, and the base (B) of the bipolar junction transistor is raised to a predetermined voltage level greater than 0 volts.

Description

engine ignition control

technical field

The invention relates to an ignition control device, in particular to an ignition control device for an engine starting system.

Background technique

The speed and flexibility of the motorcycle are the reasons why it is popular with the public. As for the operation of the motorcycle, the fresh air and fuel introduced from the outside world are sent to the carburetor to mix into oil and gas, and then the oil and gas are input into the engine to explode to generate power. , to promote the reciprocating movement of the piston to drive the transmission system to drive the rotation of the rear wheels, and the rear wheels drive the front wheels to rotate synchronously to achieve the purpose of traveling. Generally, when the motorcycle stops shortly after restarting, it can be easily started The engine is running, but when it is stopped for a long time (commonly known as a cold car), it will be difficult to start the engine in a cold car state.

Referring to FIG. 1 , China Taiwan Patent Certificate No. I300821 discloses an engine starting system 7 . The engine starting system 7 includes a power unit 71 , a main switch lock 70 and a sensor 72 . The power supply unit 71 (such as a storage battery) is used to provide the voltage and current required by the engine starting system 7 of the entire motorcycle. The engine starting system 7 also includes a motor control device 73 and an ignition control device 75, wherein the motor control device 73 is used to drive the crankshaft rotation of the engine (not shown), and the ignition control device 75 is used to make the spark plug ignite to achieve continuous operation of the engine . The main switch lock 70 is electrically connected to a power supply unit 71 , a motor control device 73 and an ignition control device 75 . The sensor 72 is electrically connected to the main switch lock 70 and the ignition control device 75 , and the sensor 72 is electrically connected to the power supply unit 71 through the power switch 78 . The sensor 74 (for example, a chip card) can sense the sensor 72 so that the main switch lock 70 can be switched.

The motor control device 73 comprises a brake arm indicating switch 731, a starting switch 733, a relay 737 and a starting motor 739. The energized contact 738 is electrically connected to the power supply unit 71 and the starter motor 739 . When the brake arm indicator switch 731 and the start switch 733 are both in the conduction state, the excitation coil 735 of the relay 737 is excited, and the relay 737 is in the operating state, that is, the energized contact 738 is in the conduction state, so that the power supply unit 71 supplies power to the The starter motor 739 is used to rotate the starter motor 739 to drive the crankshaft of the engine to rotate.

The ignition control device 75 includes a capacitive discharge igniter (Capacitive Discharge Ignition; CDI) 751, a high voltage coil 753, a spark plug 755 and an ignition signal generator 757, wherein the capacitive discharge igniter 751, the high voltage coil 753 and the spark plug 755 are electrically connected in series, The ignition signal generator 757 is electrically connected to the capacitor discharge igniter 751 to control the conduction time of the capacitor discharge igniter 751, so that the high voltage coil 753 generates high voltage, and supplies power to the spark plug 755, so that the spark plug 755 generates an arc and ignites , so that the engine can continue to rotate on its own. The ignition signal generator 757 includes an alternator (Alternating CurrentGenerator; ACG) 7571 and a pulse generator (Pulser) 7573. When the engine rotates, it drives the alternator 7571 to generate electricity and transmits it to the pulse generator 7573. The wave generator 7573 will control the capacitive discharge igniter 751 to make the high voltage coil 753 generate high voltage and supply power to the spark plug 755 to make the spark plug 755 generate an arc and ignite.

With reference to Fig. 2, Chinese Taiwan Patent Certificate No. I344430 discloses a motorcycle engine structure. The crankshaft 81 is provided with a flywheel 82 and a pulse wave generator 83 on the left crankcase side. The flywheel 82 is provided with a bump 821. When the crankshaft 81 rotates to drive the flywheel 82, the pulse wave generator 83 senses the bump on the flywheel 82. Block 821, the pulse wave generator 83 can output a signal to the capacitor discharge igniter, and the capacitor discharge igniter can make the spark plug perform precise ignition action.

Referring to FIG. 3, Taiwan Patent Certificate No. 104401 discloses a conventional ignition device 91 (such as a capacitive discharge igniter (CDI) or a crystallized coil ignition (TCI)), a low voltage (Vs) supplier 93, a capacitor 96 and 98 , diodes 90 , 92 and resistor 94 . A conventional ignition device 91 provides the high voltage required to collapse or ionize the gas mixture in the gap along the surface 971 of the moving spark igniter (TSI) 97 (magnetic field increases the volume of the plasma).

None of the above-mentioned 3 patents discloses that when the starter motor is operating in a low temperature state, the voltage of the pulse generator (Pulser) generated by the AC generator (ACG) is lower than that of the pulse generator in the normal temperature state, and the pulse generator’s after The edge voltage is slightly lower than the leading edge voltage of the pulse generator. When the trailing edge voltage of the pulse generator is lower than 1.2V, the bipolar junction transistor (BJT) of the trailing edge circuit of the capacitor discharge igniter (CDI) cannot be effectively triggered, so the trailing edge signal cannot be generated to discharge the capacitor. Microcontroller (MCU) for the igniter (CDI). Since the microcontroller (MCU) judges when to ignite the spark plug based on the trailing edge signal, when the speed is low, if the trailing edge signal is unstable, it will cause poor ignition of the spark plug and make it difficult to start the vehicle engine.

Therefore, it is necessary to provide an engine ignition control device that can solve the aforementioned problems.

Contents of the invention

The invention provides an engine ignition control device comprising: a pulse wave generator; and a control unit including a microcontroller and a printed circuit board, the printed circuit board is electrically connected to the microcontroller, wherein the printed circuit board includes A trailing edge signal generating circuit, the trailing edge signal generating circuit is electrically connected to a microcontroller, the trailing edge signal generating circuit includes a bipolar junction transistor, and the emitter (E) of the bipolar junction transistor is electrically connected to The pulse generator, the collector (C) of the bipolar junction transistor is electrically connected to the microcontroller, and the base (B) of the bipolar junction transistor is boosted to greater than 0 volts A predetermined voltage level, wherein the printed circuit board further includes a voltage divider circuit and a leading edge signal generating circuit, the leading edge signal generating circuit and the trailing edge signal generating circuit are connected in parallel, and then connected in series with the voltage dividing circuit, The voltage divider circuit is electrically connected to the pulse wave generator, the leading edge signal generation circuit is electrically connected to the microcontroller, and the emitter (E) of the bipolar junction transistor is connected through the voltage divider. The circuit is electrically connected to the pulse generator.

The base (B) of the bipolar junction transistor of the present invention is raised to a predetermined voltage level, which can greatly reduce the trigger voltage of the trailing edge voltage signal of the pulse generator. Because the microcontroller (MCU) judges when spark plugs are ignited based on the trailing edge signal, the trailing edge signal of the ignition control device of the present invention is stable at low speeds below minus 20 degrees Celsius, which will not cause spark plugs to ignite. Poor ignition can make the vehicle engine start easily.

In order to make the above and other objects, features, and advantages of the present invention more apparent, a detailed description will be given below with reference to the accompanying drawings.

Description of drawings

Fig. 1 is the schematic diagram of the engine starting system of prior art;

Fig. 2 is the disposition diagram of crankshaft, flywheel and pulse wave generator of prior art;

Fig. 3 is the schematic diagram of the ignition device of prior art;

4 is a schematic diagram of an engine starting system according to an embodiment of the present invention;

5 is a schematic diagram of a control unit and a pulse generator according to an embodiment of the present invention;

Fig. 6 shows the voltage signal of the pulse wave generator of the embodiment of the present invention; And

FIG. 7 is a schematic circuit diagram of a printed circuit board according to an embodiment of the present invention.

[Description of main component symbols]

1 Engine starting system 10 Main switch lock

11 Power supply unit 13 Motor control unit

131 Brake arm indicator switch 133 Start switch

137 Relay 135 Excitation coil

138 energized contact 139 starter motor

15 Ignition control device 151 Control unit

153 High voltage coil 155 Spark plug

157 Ignition signal generator 1571 Alternator

1573 Pulse Generator

1511 Printed Circuit Board 1512 Microcontroller

1513 Voltage divider circuit 1514 Leading edge signal generation circuit

1515 trailing edge signal generation circuit 1515a bipolar junction transistor

1515b bipolar junction transistor

7 Engine starting system 70 Main switch lock

71 Power supply unit 72 Sensor

73 Motor control device 731 Brake arm indicator switch

733 Start switch 737 Relay

735 Exciting coil 738 Energized contact

739 starter motor

74 Induction element 78 Power switch

75 Ignition control device 751 Capacitor discharge igniter

753 High Voltage Coil 755 Spark Plug

757 Ignition signal generator 7571 Alternator

7573 Pulse Generator

81 Crankshaft 82 Flywheel

821 bump 83 pulse generator

90 Diode 91 Ignition device

92 Diode 93 Low Voltage (Vs) Supply

94 Resistor 96 Capacitor

97 Mobile spark igniter 971 Surface

98 capacitors

Detailed ways

Referring to FIG. 4 , it shows an engine starting system 1 according to an embodiment of the present invention. The engine starting system 1 includes a power supply unit 11 , a main switch lock 10 , a motor control device 13 and an ignition control device 15 . The power supply unit 11 (such as a storage battery) is used to provide the voltage and current required by the engine starting device 1 of the entire motorcycle. The motor control device 13 is used to drive the crankshaft of the engine to rotate (not shown), and the ignition control device 15 is used to ignite the spark plug to achieve continuous operation of the engine. The main switch lock 10 is electrically connected to the power supply unit 11 , the motor control device 13 and the ignition control device 15 .

Motor control device 13 comprises brake arm indicator switch 131, start switch 133, relay 137 and starter motor 139, and the exciting coil 135 of brake arm indicator switch 131, start switch 133 and relay 137 is connected in series, and a group of relay 137 The energizing contact 178 is electrically connected to the power supply unit 11 and the starter motor 139 . When the brake arm indicator switch 131 and the start switch 133 are both in the conduction state, the excitation coil 135 of the relay 137 is excited, and the relay 137 is in the operating state, that is, the energized contact 138 is in the conduction state, so that the power supply unit 11 supplies power to the The starter motor 139 is used to rotate the starter motor 139 to drive the crankshaft of the engine to rotate.

The ignition control device 15 includes a control unit 151 , a high voltage coil 153 , a spark plug 155 and an ignition signal generator 157 . The control unit 151 is similar to a Capacitive Discharge Ignition (CDI). The control unit 151, the high-voltage coil 153 and the spark plug 155 are electrically connected in series with each other, and the ignition signal generator 157 is electrically connected to the control unit 151 to determine the conduction time of the control unit 151, so that the high-voltage coil 153 generates high voltage and supplies power to the spark. The plug 155 makes the spark plug 155 generate an electric arc to ignite, so that the engine can continue to rotate by itself. The ignition signal generator 157 includes an alternator (Alternating Current Generator; ACG) 1571 and a pulse wave generator (Pulser) 1573, when the main switch lock 10 controls the power supply unit 11, the motor control device 13 and the ignition control device 15 Electric conduction, when the engine rotates, it drives the alternator 1571 to generate electricity and transmits it to the pulse wave generator 1573. The voltage signal of the pulse wave generator 1573 can be transmitted to the control unit 151, and the pulse wave generator 1573 will determine the control unit 151, so that the high-voltage coil 153 generates high voltage, and supplies power to the spark plug 155, so that the spark plug 155 generates an arc and ignites.

Referring to FIG. 5 , the control unit 151 includes a microcontroller 1512 and a printed circuit board 1511 . The printed circuit board 1511 can be modularized and electrically connected to the microcontroller 1512 . In detail, the printed circuit board 1511 includes a voltage dividing circuit 1513 , a leading-edge signal generating circuit 1514 and a trailing-edge signal generating circuit 1515 . After the leading edge signal generating circuit 1514 and the trailing edge signal generating circuit 1515 are connected in parallel, they are connected in series with the voltage divider circuit 1513 . The voltage dividing circuit 1513 is electrically connected to the pulse wave generator 1573 , and the leading-edge signal generating circuit 1514 and the trailing-edge signal generating circuit 1515 are both electrically connected to the microcontroller 1512 . Referring to FIG. 6 , the voltage signal of the pulse wave generator 1573 is the positive voltage of the leading edge signal and the negative voltage of the trailing edge signal, especially the voltage signal of the low temperature state of the pulse wave generator 1573 below minus 20 degrees Celsius is higher than the voltage of the normal temperature state The signal is low, and the trailing edge voltage of pulse generator 1573 is slightly lower than the leading edge voltage of pulse generator 1573 . The voltage dividing circuit 1513 is used to stabilize the voltage signal of the pulse wave generator 1573 and convert the sinusoidal wave into a square wave. The leading edge signal generating circuit 1514 provides the leading edge signal to the microcontroller 1512, which can be used as a basis for judging spark plug ignition when the engine rotates at a high speed. The trailing edge signal generating circuit 1515 provides the trailing edge signal to the microcontroller 1512, which can be used as a basis for judging spark plug ignition when the engine rotates at a low speed.

Referring to FIG. 7 , in this implementation, the voltage divider circuit 1513 may be composed of multiple resistors, capacitors, voltage dividers and the like. The leading edge signal generating circuit 1514 can be composed of multiple resistors, capacitors, bipolar junction transistors (BJTs), and the like. The trailing edge signal generating circuit 1515 can be composed of multiple resistors, capacitors, bipolar junction transistors (BJTs), and the like. The disposition design of the electronic components (resistors, capacitors, bipolar junction transistors, etc.) of the voltage divider circuit 1513, the leading edge signal generating circuit 1514 and the trailing edge signal generating circuit 1515 in FIG. 7 is used to illustrate the present invention, not to limit the present invention.

In particular, the trailing edge signal generation circuit 1515 includes a bipolar junction transistor 1515a, the emitter (E) of the bipolar junction transistor 1515a can be electrically connected to the pulse generator 1573 via the voltage divider circuit 1513, and the bipolar junction transistor The collector (C) of 1515a can be electrically connected to microcontroller 1512 via another bipolar junction transistor 1515b, and the base (B) of bipolar junction transistor 1515a is boosted to a predetermined voltage level greater than 0V (volts). bit.

For example, the 12V voltage of the power supply unit is received by a voltage stabilizing integrated circuit (such as model 7805), and the 12V voltage is converted into 5V voltage. In this embodiment, the 5V voltage is adjusted by the resistors R20 and R21, so that the base (B) voltage VB of the bipolar junction transistor 1515a is set to a predetermined voltage level of 0.3125V. Since the BJT 1515a is turned on if VBE is at least about 0.7V, the emitter (E) voltage VB of the BJT 1515a only needs to be greater than 0.387V (negative voltage) to be turned on. Since the adjustment of the resistors R8 and R9 of the voltage divider circuit 1513 will reduce the voltage signal of the pulse wave generator 1573, the voltage signal of the pulse wave generator 1573 only needs to be greater than 0.651V (negative voltage) to trigger the conduction of the bipolar The transistor 1515a is connected to provide a trailing edge signal to the microcontroller 1512 as a basis for judging spark plug ignition when the engine rotates at a low speed. Especially when the ambient temperature is below minus 20 degrees centigrade at low speed, the voltage signal of the pulse wave generator 1573 of the present invention only needs a low voltage, and it can still trigger and turn on the bipolar junction transistor 1515a to provide a trailing edge signal to the micro The controller 1512 is used as a spark plug for ignition.

Compared with the trailing edge voltage signal of the prior art pulse wave generator must be greater than 1.2V (negative voltage) to turn on the bipolar junction transistor, the present invention only needs to be greater than 0.651V (negative voltage) to trigger the conduction of the bipolar junction transistor. pole junction transistor. In other words, the base (B) of the bipolar junction transistor of the present invention is raised to a predetermined voltage level, which can greatly reduce the trigger voltage of the trailing edge voltage signal of the pulse generator. Because the microcontroller (MCU) judges when spark plugs are ignited based on the trailing edge signal, the trailing edge signal of the ignition control device of the present invention is stable at low speeds below minus 20 degrees Celsius, which will not cause spark plugs to ignite. Poor ignition can make the vehicle engine start easily.

To sum up, what is described above is only the description of the implementation or examples of the technical means adopted by the present invention to solve the problems, and is not intended to limit the scope of the patent implementation of the present invention. That is, all equivalent changes and modifications that are consistent with the content of the claims of the present invention, or made according to the patent scope of the present invention, are covered by the patent scope of the present invention.

Claims (5)

1. An engine ignition control device, comprising: pulse generator; and The control unit includes a microcontroller and a printed circuit board, the printed circuit board is electrically connected to the microcontroller, wherein the printed circuit board includes a trailing edge signal generating circuit, and the trailing edge signal generating circuit is electrically connected to the microcontroller controller, the trailing edge signal generating circuit includes a bipolar junction transistor, the emitter (E) of the bipolar junction transistor is electrically connected to the pulse generator, and the collector of the bipolar junction transistor (C) electrically connected to the microcontroller and the base (B) of the BJT is raised to a predetermined voltage level greater than 0 volts, Wherein the printed circuit board also includes a voltage divider circuit and a leading edge signal generating circuit, the leading edge signal generating circuit and the trailing edge signal generating circuit are connected in parallel, and then connected in series with the voltage dividing circuit, the voltage dividing circuit Electrically connected to the pulse wave generator, the leading edge signal generating circuit is electrically connected to the microcontroller, and the emitter (E) of the bipolar junction transistor is electrically connected to the The pulse generator. 2. The engine ignition control device according to claim 1, further comprising a voltage stabilizing integrated circuit for receiving the first voltage of the power supply unit and converting the first voltage into a second voltage, the second voltage being less than The first voltage, wherein the trailing edge signal generating circuit further includes two resistors, after the adjustment of the two resistors, the base (B) voltage of the bipolar junction transistor is set to the predetermined voltage level. 3. The engine ignition control device according to claim 2, wherein the first voltage is 12V, the second voltage is 5V, and the voltage signal of the pulse wave generator is greater than 0.651 at an ambient temperature below minus 20 degrees Celsius. V (negative voltage) can trigger and turn on the bipolar junction transistor. 4. The engine ignition control device according to claim 1, further comprising a high-voltage coil, a spark plug and an ignition signal generator, the control unit, the high-voltage coil and the spark plug are electrically connected in series, and the ignition signal generator is electrically connected in series. connected to the control unit. 5. The engine ignition control device according to claim 1, wherein the main switch lock is used to control the electrical conduction between the power supply unit, the motor control device and the ignition control device, so that the voltage signal of the pulse wave generator is transmitted to the control unit.