CN211524983U - Energy-controllable alternating-current ignition system - Google Patents

Abstract

The utility model discloses an energy-controllable alternating current ignition system, which comprises a power supply module, a controller module, a signal driving module, a BOOST boosting module, an H bridge driving module and an actuator module; the input end of the BOOST boosting module is connected with the power supply module, the output end of the BOOST boosting module is connected with the input end of the H-bridge driving module, and the control end of the BOOST boosting module is connected with the controller module through the signal driving module; the control end of the H-bridge driving module is connected with the controller module through the signal driving module; the actuator module comprises an ignition coil and an ignition plug, the ignition coil comprises a primary coil and a secondary coil, the primary coil is connected with the output end of the H-bridge driving module, and the secondary coil is connected with the ignition plug. The system can accurately control the energy of the ignition system, and avoids the waste of energy.

Description

An energy controllable AC ignition system

technical field

The utility model relates to the technical field of electric ignition systems, in particular to an energy-controllable alternating current ignition system.

Background technique

The current mainstream ignition systems are inductive energy storage ignition systems and capacitive energy storage ignition systems. Capacitive energy storage ignition systems are now more common. The two methods have different working principles and have limitations to a certain extent.

1. Inductive energy storage ignition system:

(1) Working principle: The inductive energy storage electric ignition device is mainly composed of a battery, an ignition switch K1, a circuit breaker K2, a resistor, an ignition coil and a capacitor. The direct current returns to the battery through the ignition switch, resistance, and ignition coil primary winding circuit breaker K2, and capacitors are connected in parallel at both ends of the circuit breaker. At the beginning, K1 is closed, K2 is disconnected, and the current is charged to the capacitor through R-L-C until the capacitor is fully charged, and the circuit is disconnected. When the circuit breaker K2 is closed, the primary coil instantly passes current, and the secondary coil induces a huge electromotive force to achieve instant ignition of the spark plug.

(2) Limitations: The energy stored in the capacitor is wasted, the spark lasts for a long time, and the energy loss is serious; the ignition energy is uncontrollable, and the ignition energy cannot be selected according to the working conditions.

2. Capacitor energy storage ignition system:

(1) Working principle: Capacitive energy storage ignition system is mainly composed of DC booster (oscillator, transformer, rectifier), energy storage capacitor, thyristor, and thyristor trigger circuit. When the ignition switch is turned on, the oscillator starts to work, converting the low-voltage direct current of the power supply into low-voltage alternating current, which is boosted by the transformer. Capacitor charging. The energy storage process starts when the ignition switch is turned on, and is not controlled by the ignition signal. When the ignition signal arrives, the trigger circuit generates a trigger pulse, which makes the thyristor turn on quickly, the energy storage capacitor discharges to the primary winding of the ignition coil, the primary current increases rapidly, and the secondary coil induces a high induced electromotive force, which makes the spark plug gap generate sparks Ignition is achieved by igniting a flammable gas.

(2) Limitation: Compared with the inductive energy storage ignition system, the spark duration is short and the energy loss is small, but the energy of the spark cannot be controlled, and the ignition energy cannot be adjusted according to different working conditions.

The current ignition devices of internal combustion engines are mainly of the above two types. Generally, the capacitor energy storage type ignition system is mostly used, because it has better universality in all aspects compared with the inductive energy storage type. However, due to different working conditions, the ignition energy It is easy to waste energy if it remains unchanged. The current mainstream technology cannot realize the control of spark energy. With the development of industry and energy saving, people pay more and more attention, and a new method is needed to realize the adjustable spark energy.

Utility model content

The utility model proposes an energy-controllable AC ignition system, which solves the problem that the energy of the existing ignition system is uncontrollable and causes energy waste.

The technical means adopted by the utility model are as follows:

An energy-controllable AC ignition system, comprising a power supply module, a controller module, a signal driving module, a BOOST boosting module, an H-bridge driving module and an actuator module;

The input end of the boosting module is connected with the power supply module, the output end is connected with the input end of the H-bridge drive module, and the control end is connected with the controller module through the signal drive module;

The control terminal of the H-bridge driving module is connected with the controller module through the signal driving module;

The actuator module includes an ignition coil and an ignition plug, the ignition coil includes a primary coil and a secondary coil, the primary coil is connected to the output end of the H-bridge drive module, and the secondary coil is connected to the ignition plug.

Further, it also includes a voltage feedback module, the input end of the voltage feedback module is connected with the output end of the BOOST boosting module, and the output end of the voltage feedback module is connected with the controller module.

Further, it also includes a current feedback module, the current feedback module is disposed between the output end of the H-bridge drive module and the primary coil, and the output end of the current feedback module is connected to the controller module.

Further, the power module includes a battery for providing electrical energy and an auxiliary power module for converting the voltage of the battery into a power supply that can be used to power other modules.

Further, an input module is also included, and the input module is connected with the controller module.

Further, a display module is also included, and the display module is connected with the controller module.

Further, the signal driving circuit includes a first signal driving unit, a second signal driving unit and a third signal driving unit;

The controller module is connected to the control terminal of the BOOST boosting module through the third signal driving unit;

The controller module is connected to the control terminal of the H-bridge driving module through the first signal driving unit and the second signal driving unit.

Further, the H-bridge driving module has multiple groups, and each group of H-bridge driving modules is connected with an actuator module.

Compared with the prior art, the energy-controllable AC ignition system of the present invention has the following advantages. By setting the controller module, the BOOST boosting module and the H-bridge drive module in the system, the controller module can control the BOOST boosting The turn-on or turn-off time of the module and/or the H-bridge drive module, thereby changing the magnitude of the current input to the glow plug or the ignition time, realizes the controllable energy of the glow plug during ignition.

Description of drawings

1 is a schematic diagram of an energy-controllable AC ignition system disclosed by the utility model;

Figure 2 is a schematic diagram of the voltage feedback module.

In the figure: 10, battery, 11, auxiliary power supply, 2, controller module, 30, first signal drive unit, 31, second signal drive unit, 32, third signal drive unit, 4, BOOST booster module, 5 , H bridge drive module, 6, actuator module, 7, voltage feedback module, 8, current feedback module.

Detailed ways

As shown in FIG. 1, the energy-controllable AC ignition system disclosed by the utility model includes a power supply module, a controller module 2, a signal driving module, a BOOST boosting module 4, an H-bridge driving module 5 and an actuator module 6;

The input end of the boost module 4 is connected to the power supply module, the output end is connected to the input end of the H-bridge drive module 5, and the control end is connected to the controller module 2 through the signal drive module;

The control end of the H-bridge driving module 5 is connected to the controller module 2 through the signal driving module;

The actuator module 6 includes an ignition coil and an ignition plug, the ignition coil includes a primary coil and a secondary coil, the primary coil is connected to the output end of the H-bridge drive module 5, and the secondary coil is connected to the ignition plug.

Specifically, in the present invention, as shown in FIG. 1 , the power module includes a battery 10 for providing electrical energy and an auxiliary power module 11 for converting the voltage of the battery 10 into an auxiliary power module 11 that can be used to power other modules. 10 can output a voltage of 7.2V. The auxiliary power module 11 includes two sets of power chips 34063 and one set of power chips LM2596. The two sets of power chips 34063 convert the 7.2V voltage output by the battery into 15V voltage and 10V voltage respectively. The 7.2V voltage output by the battery is converted into a 3.3V voltage, and the auxiliary power module is used to supply power to different modules. The BOOST boosting module 4 includes a polar capacitor C5, an inductor L1, a switch tube MOS1, a Zener diode D7 and a polar capacitor C6. The input end of the BOOST boosting module 4 is connected to the battery 10, and the output end is connected to the H-bridge drive module 5. The input terminal is connected, and the control terminal is connected to the controller module through a signal driving module. In this embodiment, the controller module 2 is composed of a minimum control system composed of a chip STM32F103, and the signal driving module includes a first signal driving unit 30 with the same structure. , the second signal driving unit 31 and the third signal driving unit 32, in this embodiment, the first signal driving unit 30, the second signal driving unit 31 and the third signal driving unit 32 are composed of a half-bridge driving chip IR2104 Bridge drive circuit.

Specifically, the third signal driving unit 32 includes a third half-bridge driving chip IR3, a polar capacitor C8, a polar capacitor C7, a diode D8, a diode D9, a diode D10, a resistor R9, a resistor R10, a resistor R11 and a resistor R12. The three half-bridge driver chip IR3 adopts the half-bridge driver IR2104. The IN pin of the half-bridge driver IR2104 is connected to an output pin of the STM32F103 chip. The COM pin of the half-bridge driver IR2104 is isolated from the power supply (15V) through the polar capacitor C8. The diode D9 is connected in parallel between the VCC pin and the VB pin. The HO pin of the half-bridge driver IR2104 is connected with the diode D8 (cathode) and the resistor R9 connected in parallel, and the other end of the diode D8 (anode) and the resistor R9 is connected with the resistor R10 One end of the resistor R10 is connected to the negative end of the polar capacitor C7, the positive end of the polar capacitor C7 is connected to the VB pin of the half-bridge driver IR2104, the other end of the resistor R10 connected to the polar capacitor C7 is also connected to the half-bridge driver IR2104. The VS pin of the bridge driver IR2104 is connected, the LO pin of the half-bridge driver IR2104 is connected to the cathode of the diode D10 and one end of the resistor R11, the anode of the diode D10 is connected to the other end of the resistor R11 and then connected to one end of the resistor R12. The other end of R12 is grounded, and the anode of the diode D10 is also connected to the control end of the switch tube MOS1. The STM32F103 chip can control the switch of the switch tube MOS1 through the first signal driving unit.

The second signal driving unit 31 includes a second half-bridge driving chip IR2, a polar capacitor C4, a polar capacitor C3, a diode D4, a diode D2, a diode D6, a resistor R5, a resistor R6, a resistor R7 and a resistor R8, and the second half-bridge The driver chip IR2 adopts the half-bridge driver IR2104, and the IN pin of the half-bridge driver IR2104 is connected to an output pin of the STM32F103 chip;

The first signal driving unit 30 includes a first half-bridge driving chip IR1, a polar capacitor C1, a polar capacitor C2, a diode D3, a diode D1, a diode D5, a resistor R4, a resistor R3, a resistor R2 and a resistor R1, and the first half-bridge The driver chip IR1 adopts the half-bridge driver IR2104, and the IN pin of the half-bridge driver IR2104 is connected to an output pin of the STM32F103 chip.

The H-bridge driving module 5 includes a switch transistor Q1, a switch transistor Q2, a switch transistor Q3, a switch transistor Q4, a diode D_1, a diode D_2, a diode D_3 and a diode D_4. In this embodiment, the switch transistor Q1, the switch transistor Q2, the switch transistor Q3 and The switches Q4 are all MOS transistors, the diode D_1 is connected in parallel with the source and the drain of the switch Q2, the diode D_2 is connected in parallel with the source and the drain of the switch Q1, and the diode D_3 is connected in parallel with the source of the switch Q4 and both ends of the drain, the diode D_4 is connected in parallel with the source and drain ends of the switch Q3, the switch Q1 and the switch Q3 form a half bridge, the switch Q4 and the switch Q2 form a half bridge, the anode of the diode D2 and the switch The control terminal of the tube Q2 is connected, the anode of the diode D6 is connected to the control terminal of the switch tube Q4, the anode of the diode D5 is connected to the control terminal of the switch tube Q1, the anode of the diode D1 is connected to the control terminal of the switch tube Q3, and the STM32F103 chip is connected to the control terminal of the switch tube Q3. 2. The third signal driving unit can control the work of the H-bridge driving module.

The output end of the H-bridge drive module 5 is connected to the primary coil of the ignition coil, the secondary coil of the ignition coil is connected to the ignition plug, and the ignition coil is a high-frequency step-up transformer, which can boost the voltage of the battery to between 8 and 10KV as required for ignition of the piston.

The working principle of the energy-controllable AC ignition system disclosed by the utility model is as follows: the PWM signal output by the controller module controls the on and off of the control terminal of the BOOST boosting module through the third signal driving unit to control the storage and release of the inductance The energy then boosts the voltage output by the battery, and the controller module outputs a pair of complementary PWM signals to control the first and second signal drive units respectively. The first signal drive unit and the second signal drive unit control 4 in the H-bridge drive module. The switch tubes are alternately turned on diagonally to convert the DC high voltage output by the BOOST booster module into a square wave and then input it to the primary coil of the ignition coil. The secondary coil of the ignition coil further increases the voltage in the primary coil. After the boosted pressure is input to the ignition plug, the ignition plug is ignited. In the present invention, the controller module can change the duty ratio and frequency of the output PWM signal, thereby changing the on and off time of the BOOST boosting module or the H-bridge driving module, and by changing the duty ratio of the PWM in the BOOST driving circuit (duty), the output voltage of BOOST can be changed, because its voltage output formula is U=U _in /(1-duty). The output voltage of the voltage module changes the voltage applied to the primary coil, and the voltage of the secondary coil changes, so that the current acting on the spark plug changes, and the ignition energy is controllable. When the controller module changes the turn-on and turn-off time of the H-bridge drive module, it can change the frequency of the AC voltage acting on the primary coil, and then the AC frequency on the secondary coil also changes. According to Q=I2Rt, the frequency change time is also Change, the energy of the ignition can be adjusted.

Further, a voltage feedback module is also included. As shown in FIG. 2 , the input terminal of the voltage feedback module is connected to the output terminal of the BOOST boosting module, and the output terminal of the voltage feedback module is connected to the controller module. Specifically, the voltage feedback module includes a resistor RV1, a resistor RV2, and a first operational amplifier U1. One end of the resistor RV2 is grounded, the other end is connected to one end of the resistor RV1, and the other end of the resistor RV1 is connected to the output of the boost module. Resistor RV1 and resistor RV2 form a voltage divider circuit, one end connected to resistor RV1 and resistor RV2 is connected to the same-direction input end of the first operational amplifier, the opposite input end of the first operational amplifier U1 is connected to the output end, and the output end is connected to the STM32F103 chip The output voltage of BOOST is reduced to less than 3.3V for acquisition by the single-chip microcomputer in the form of resistance division. After the voltage division, it is sent to an ADC acquisition pin of the single-chip microcomputer through the voltage isolator composed of op amps. Its function is to ensure that the output of BOOST is stable without fluctuation through feedback closed-loop PID control, thereby ensuring the accuracy of the calculated energy. In this embodiment, the first operational amplifier U1 adopts the LM324 chip.

Further, it also includes a current feedback module, the current feedback module is arranged between the output end of the H-bridge drive module and the primary coil, the output end of the current feedback module is connected to the controller module, and the output end of the current feedback module is connected to the controller module. In this embodiment, the current feedback module includes a current detection chip INA282 and a resistor 20, the REF1 pin and REF2 pin of the current detection chip INA282 are grounded, and the -IN pin of the current detection chip INA282 is connected to the H An output end of the bridge driver module is connected, the +IN pin of the current detection chip INA282 is connected to one end of the primary coil, and the resistor 20 is connected in parallel with the -IN pin and the +IN pin of the current detection chip INA282 Between the pins, the OUT pin of the current detection chip INA282 is connected to the controller module. A current feedback module is provided, which can calculate the energy by collecting the current of the primary coil, and at the same time detect the maximum value to ensure that it will not exceed the rated value of the devices in the H-bridge module and the BOOST module, that is, it acts as a limiter.

Further, it also includes an input module, the input module is connected with the controller module, the input module can adjust the duty cycle of the PWM signal output by the controller module, and then adjust the energy of the spark plug to be suitable for different For the ignition needs, the input module can be a key or a DIP switch.

Further, it also includes a display module, the display module is connected with the controller module, and the display module is used to display various parameters, for example, the duty cycle of the PWM signal output by the controller module, the output of the boost module Information such as voltage value and pulse width driving time in the H-bridge driving module, in this embodiment, the display module uses an OLED display screen for display.

Further, the H-bridge drive module has multiple groups, and each group of H-bridge drive modules is connected with an actuator module, which can be used to ignite multiple ignition plugs.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Equivalent replacement or modification of the new technical solution and its utility model concept shall be included within the protection scope of the present utility model.

Claims (8)

1. An energy-controllable AC ignition system, characterized in that: comprising: a power supply module, a controller module, a signal driving module, a BOOST boosting module, an H-bridge driving module and an actuator module; The input end of the boosting module is connected with the power supply module, the output end is connected with the input end of the H-bridge drive module, and the control end is connected with the controller module through the signal drive module; The control terminal of the H-bridge driving module is connected with the controller module through the signal driving module; The actuator module includes an ignition coil and an ignition plug, the ignition coil includes a primary coil and a secondary coil, the primary coil is connected to the output end of the H-bridge drive module, and the secondary coil is connected to the ignition plug. 2 . The energy-controllable AC ignition system according to claim 1 , further comprising a voltage feedback module, the input end of the voltage feedback module is connected to the output end of the BOOST boosting module, and the voltage feedback module The output of the module is connected to the controller module. 3. The energy-controllable AC ignition system according to claim 1 or 2, further comprising a current feedback module, the current feedback module is arranged at the output end of the H-bridge drive module and the primary coil In between, the output end of the current feedback module is connected with the controller module. 4 . The energy-controllable AC ignition system according to claim 1 , wherein the power module includes a battery for providing electrical energy and an auxiliary power module. 5 . 5 . The energy-controllable AC ignition system according to claim 1 , further comprising an input module, wherein the input module is connected with the controller module. 6 . 6 . The energy-controllable AC ignition system according to claim 1 , further comprising a display module, the display module is connected to the controller module. 7 . 7. The energy-controllable AC ignition system according to claim 1, wherein the signal driving module comprises a first signal driving unit, a second signal driving unit and a third signal driving unit; The controller module is connected to the control terminal of the BOOST boosting module through the third signal driving unit; The controller module is connected to the control terminal of the H-bridge driving module through the first signal driving unit and the second signal driving unit. 8 . The energy-controllable AC ignition system according to claim 1 , wherein the H-bridge driving module has multiple groups, and each group of H-bridge driving modules is connected with an actuator module. 9 .

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