A DC ignition circuit sampling control circuit and a sampling control method

Abstract

A DC ignition circuit sampling control circuit and a sampling control method, including an ignition controller. The output end of the ignition controller is connected to an ignition start trigger, and the ignition start trigger is electrically connected to an ignition device. A current transformer H1 is provided on the ignition cable between the ignition start trigger and the ignition device, and the current transformer H1 is electrically connected to an ignition acquisition system. By controlling multiple triodes simultaneously through multiple ignition signals, the ignition power supplies controlled by the triodes are connected in parallel and then connected to the ignition circuit, which can avoid abnormal ignition when one path fails. Moreover, by utilizing the phenomenon of the instantaneous current rise of the ignition coil, the current transformer detects this instantaneous rise moment, amplifies the signal, and then sends it to the acquisition system. The direct current can be detected by the current transformer, and the accurate ignition moment can be recorded, which has extraordinary significance for the control of the engine. This control circuit has a simple structure, is reliable and durable, and is suitable for popularization in the field of engine testing.

Description

Technical Field

[0001] The present invention relates to the field of engine tests, and particularly to a DC ignition line sampling control circuit and a sampling control method. Background Art

[0002] In the field of engine control for automobiles, aerospace, and aviation, the accuracy of engine ignition control affects the working performance of the engine. Especially in the aerospace field, the ignition start time reference of the engine serves as the control time reference for subsequent carriers, affecting the adjustment of subsequent operations and must have very high precision.

[0003] When conducting engine tests, it is very important to collect the absolute zero time of equipment ignition. The more accurate the collected absolute zero time is, the more accurate the reference meaning for subsequent collected parameters will be, and the more rules can be followed for engine debugging. In the ignition circuit, usually, the power supply of the ignition coil is controlled by an intermediate relay and a contactor. The traditional intermediate relay and contactor are realized by guiding the opening and closing of a mechanical switch through electromagnetic action. There is a mechanical response time from the issuance of the ignition command to the energization of the ignition coil. Therefore, there is a delay of 5 - 30 ms between the collected ignition moment sent from the controller and the actual ignition moment. The less this delay time is reduced, the more accurately the engine can be controlled. In the prior art, when collecting the absolute zero time when the ignition coil current appears, a voltage dividing circuit is used for sampling, which will have a voltage dividing effect on the ignition voltage, causing the ignition voltage to be too low, and the voltage division will generate interfering electromagnetism, interfering with the detection of the ignition current curve. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a DC ignition line sampling control circuit and a sampling control method, which shorten the response time of ignition control by utilizing the high response characteristics of a triode. At the same time, a current transformer instantaneously detects the terminal ignition current of the ignition coil, and uses the electromagnetic induction characteristic to measure the instantaneously increasing direct current by the transformer, and transmits it to the acquisition system through a method to record the absolute zero time of ignition.

[0005] To solve the above technical problem, the technical solution adopted by the present invention is:

[0006] A DC ignition line sampling control circuit includes an ignition controller. The output end of the ignition controller is connected to an ignition start trigger, and the ignition start trigger is electrically connected to an ignition device. A current transformer H1 is provided on the ignition cable between the ignition start trigger and the ignition device, and the current transformer H1 is electrically connected to an ignition acquisition system.

[0007] In a preferred solution, the above current transformer H1 is electrically connected to a signal amplifier, and the output end of the signal amplifier is electrically connected to the ignition acquisition system.

[0008] Multiple output terminals of the above ignition controller are electrically connected to the ignition start trigger, and the multiple output terminals simultaneously send out ignition start signals.

[0009] The above ignition start trigger is internally provided with an ignition power supply and multiple ignition trigger branches. The input end of the ignition trigger branch is electrically connected to the output end of the ignition controller, the ignition power supply is electrically connected to the ignition trigger branch, and the output ends of the ignition trigger branches are connected in parallel and then electrically connected to the ignition device.

[0010] The above ignition trigger branch includes a trigger triode Q1. One end of the collector and emitter of the trigger triode Q1 is connected to the positive pole VCC of the ignition power supply, and the other end is connected to a resistor R1. The other end of the resistor R1 is connected to the negative pole of the ignition power supply. The base of the trigger triode Q1 is connected to the output end of the ignition controller, and both ends of the multiple resistors R1 are connected in parallel and then electrically connected to the ignition device.

[0011] The above current transformer H1 is located on the cable after the output ends of the ignition trigger branches are connected in parallel.

[0012] The above signal amplifier is internally provided with a sampling resistor R3. The sampling resistor R3 is connected in series with the current transformer H1. Resistors R4 and R5 are respectively connected to both ends of the sampling resistor R3. The other ends of the resistor R4 and the resistor R5 are connected to the input end of the operational amplifier. A resistor R7 is provided between the output end and the inverting input end of the operational amplifier. The non-inverting input end of the operational amplifier is grounded through a resistor R6. The output end of the operational amplifier and the grounded end of the resistor R6 are electrically connected to the ignition acquisition system.

[0013] The above ignition power supply uses an ignition storage battery or a DC regulated power supply.

[0014] The sampling control method using the above sampling control circuit includes the following steps:

[0015] Step 1: The ignition controller receives a sampling start signal, checks whether the start condition is met. If the start condition is met, multiple output terminals simultaneously send out ignition start output control signals;

[0016] Step 2: The base of the trigger triode Q1 in the ignition start trigger receives the ignition start output control signal, the trigger triode Q1 is turned on, the positive pole of the ignition power supply is connected to the resistor R1, and the ignition voltages of multiple ignition trigger branches are connected in parallel and then delivered to the ignition device;

[0017] Step 3: The ignition power supply in the ignition start trigger is connected to the ignition device. The current in the cable between the ignition start trigger and the ignition device increases instantaneously. The current transformer H1 senses the instantaneous current and delivers the signal to the signal amplifier;

[0018] Step 4: The signal amplifier receives the induction signal of the current transformer H1, amplifies the signal and sends it to the ignition acquisition system, and the ignition acquisition system records the ignition moment.

[0019] A DC ignition circuit sampling control circuit and a sampling control method provided by the present invention can control multiple triodes to be triggered simultaneously through multiple ignition signals. The ignition power supplies controlled by the triodes are connected in parallel and then connected to the ignition coil, which can avoid the inability to ignite normally after a fault occurs in one path. Moreover, by using the phenomenon of the instantaneous current rise of the ignition coil, the instantaneous rise moment is detected by the transformer, the signal is amplified and then sent to the acquisition system. The direct current can be detected by the transformer, and the accurate ignition moment is recorded, which has extraordinary significance for the control of the engine. This control circuit has a simple structure, is reliable and durable, and is suitable for popularization in the field of engine testing. Brief Description of the Drawings

[0020] The present invention will be further described below with reference to the drawings and embodiments:

[0021] Figure 1 is a schematic structural diagram of the ignition sampling control circuit of the present invention;

[0022] Figure 2 is a schematic structural diagram of a preferred ignition sampling control circuit;

[0023] Figure 3 is a schematic structural diagram of the ignition start trigger;

[0024] Figure 4 is a schematic structural diagram of the signal amplifier.

[0025] In the figure: ignition controller 1, ignition start trigger 2, ignition device 3, signal amplifier 4, ignition acquisition system 5, ignition power supply 6, first ignition power trigger circuit 21, second ignition power trigger circuit 22, operational amplifier 41. Detailed Embodiments

[0026] Such as Figure 1As shown in the figure, a DC ignition circuit sampling control circuit includes an ignition controller 1. The output end of the ignition controller 1 is connected to an ignition start trigger 2, and the ignition start trigger 2 is electrically connected to an ignition device 3. An electric current transformer H1 is provided on the ignition cable between the ignition start trigger 2 and the ignition device 3. The electric current transformer H1 is electrically connected to an ignition acquisition system 5. An ignition start signal is generated by the ignition controller 1 to trigger the ignition start trigger 2 to turn on the power supply of the ignition device 3. There is a suddenly increased current on the ignition cable between the ignition start trigger 2 and the ignition device 3 at the moment of ignition start. Through the electromagnetic induction phenomenon, an induced current will be generated in the coil of the electric current transformer H1, and the fewer turns of the electric current transformer H1, the smaller its current, and the energy consumed is very small, and the voltage dividing effect on the ignition device 3 is limited.

[0027] The preferred solution is as Figure 2 As shown in the figure, the above-mentioned electric current transformer H1 is electrically connected to a signal amplifier 4, and the output end of the signal amplifier 4 is electrically connected to the ignition acquisition system 5. When the number of turns of the electric current transformer H1 is very low, its induced current is low. The signal amplifier 4 amplifies this induced current to a level that can be collected by the ignition acquisition system 5, which neither causes voltage division to the ignition load end nor accurately records the ignition moment.

[0028] As Figure 3 As shown in the figure, multiple output ends of the above-mentioned ignition controller 1 are electrically connected to the ignition start trigger 2, and ignition start signals are sent out simultaneously by the multiple output ends. The multiple output ends can prevent the failure of the ignition controller 1 from causing the inability to ignite normally when one of the output circuits fails, and improve the stability of ignition control through the redundancy of the output ends.

[0029] As Figure 3 As shown in the figure, the above-mentioned ignition start trigger 2 is internally provided with an ignition power supply 6 and multiple ignition trigger branches. The input end of the ignition trigger branch is electrically connected to the output end of the ignition controller 1, the ignition power supply 6 is electrically connected to the ignition trigger branch, and the output ends of the ignition trigger branches are connected in parallel and then electrically connected to the ignition device 3.

[0030] As Figure 3 As shown in the figure, the above-mentioned ignition trigger branch includes a trigger triode Q1. One end of the collector and the emitter of the trigger triode Q1 is connected to the positive electrode VCC of the ignition power supply 6, and the other end is connected to a resistor R1. The other end of the resistor R1 is connected to the negative electrode of the ignition power supply 6. The base of the trigger triode Q1 is connected to the output end of the ignition controller 1. The two ends of multiple resistors R1 are connected in parallel and then electrically connected to the ignition device 3. When the ignition controller 1 outputs an ignition signal at the output end, the signal provides a positive voltage at the base of the trigger triode Q1, making the collector and the emitter conduct, and the positive electrode VCC of the ignition power supply 6 is connected to the resistor R1 to provide an ignition voltage for the ignition device 3.

[0031] As Figure 3 shown, the above current transformer H1 is located on the cable after the outputs of the ignition trigger branches are connected in parallel. The probability of voltage loss in the parallel cable is greatly reduced, and the ignition moment can be stably detected.

[0032] As Figure 4 shown, the above signal amplifier 4 is provided with a sampling resistor R3. The sampling resistor R3 is connected in series with the current transformer H1. Resistors R4 and R5 are respectively connected to both ends of the sampling resistor R3. The other ends of the resistors R4 and R5 and the operational amplifier are connected to the input terminal of the operational amplifier 41. A resistor R7 is provided between the output terminal and the inverting input terminal of the operational amplifier 41. The non-inverting input terminal of the operational amplifier 41 is grounded through a resistor R6. The output terminal of the operational amplifier 41 and the grounded terminal of the resistor R6 are electrically connected to the ignition acquisition system 5. Due to the virtual short and virtual open characteristics of the operational amplifier, the voltage at the output terminal is amplified, and the amplification factor can be adjusted by the corresponding resistors, so that it can be acquired by the ignition acquisition system 5.

[0033] The triode in the above ignition start trigger 2 has a response time of only a few microseconds from receiving the trigger voltage until reaching the steady-state current, which can greatly reduce the delay effect caused by mechanical triggering. The response time in the operational amplifier 41 reaches the nanosecond level, and the ignition moment can be recorded in time.

[0034] The above ignition power supply 6 uses an ignition battery or a DC regulated power supply.

[0035] The above ignition controller 1 can use a PLC to generate corresponding ignition signals according to the received instructions.

[0036] The sampling control method using the above sampling control circuit includes the following steps:

[0037] Step 1: The ignition controller 1 receives the sampling start signal and checks whether the start condition is met. If the start condition is met, ignition start output control signals are simultaneously sent from multiple output terminals;

[0038] Step 2: The base of the trigger triode Q1 in the ignition start trigger 2 receives the ignition start output control signal, the trigger triode Q1 is turned on, the positive pole of the ignition power supply 6 is connected to the resistor R1, and the ignition voltages of multiple ignition trigger branches are connected in parallel and then delivered to the ignition device 3;

[0039] Step 3: The ignition power supply 6 and the ignition device 3 in the ignition start trigger 2 are connected. The cable between the ignition start trigger 2 and the ignition device 3 receives an instantaneous current increase. The current transformer H1 senses the instantaneous current and delivers the signal to the signal amplifier 4;

[0040] Step 4: The signal amplifier 4 receives the induction signal of the current transformer H1, amplifies the signal and sends it to the ignition acquisition system 5, and the ignition acquisition system 5 records the ignition moment.

Claims

1. A sampling control circuit for a DC ignition circuit, characterized in that: It includes an ignition controller (1). The output end of the ignition controller (1) is connected to an ignition start trigger (2), and the ignition start trigger (2) is electrically connected to an ignition device (3). A current transformer H1 is provided on the ignition cable between the ignition start trigger (2) and the ignition device (3), and the current transformer H1 is electrically connected to an ignition acquisition system (5). The current transformer H1 is electrically connected to a signal amplifier (4), and the output end of the signal amplifier (4) is electrically connected to the ignition acquisition system (5). Multiple output ends of the ignition controller (1) are electrically connected to the ignition start trigger (2), and ignition start signals are sent simultaneously from the multiple output ends. An ignition power supply (6) and multiple ignition trigger branches are provided inside the ignition start trigger (2). The input end of the ignition trigger branch is electrically connected to the output end of the ignition controller (1), the ignition power supply (6) is electrically connected to the ignition trigger branch, and the output ends of the ignition trigger branches are connected in parallel and then electrically connected to the ignition device (3). The ignition trigger branch includes a trigger triode Q1. One end of the collector and the emitter of the trigger triode Q1 is connected to the positive electrode VCC of the ignition power supply (6), and the other end is connected to a resistor R1. The other end of the resistor R1 is connected to the negative electrode of the ignition power supply (6). The base of the trigger triode Q1 is connected to the output end of the ignition controller (1), and both ends of multiple resistors R1 are connected in parallel and then electrically connected to the ignition device (3).

2. The sampling control circuit for a DC ignition circuit according to claim 1, wherein: The current transformer H1 is located on the cable after the output ends of the ignition trigger branches are connected in parallel.

3. The sampling control circuit for a DC ignition circuit according to any one of claims 1, characterized in that, A sampling resistor R3 is provided inside the signal amplifier (4). The sampling resistor R3 is connected in series with the current transformer H1. A resistor R4 and a resistor R5 are respectively connected to both ends of the sampling resistor R3. The other ends of the resistor R4 and the resistor R5 are connected to the input end of an operational amplifier (41). A resistor R7 is provided between the output end and the inverting input end of the operational amplifier (41). The non-inverting input end of the operational amplifier (41) is grounded through a resistor R6. The output end of the operational amplifier (41) and the grounded end of the resistor R6 are electrically connected to the ignition acquisition system (5).

4. A sampling control circuit for a DC ignition circuit according to claim 1, characterized in that: The ignition power supply (6) uses an ignition storage battery or a DC regulated power supply.

5. A sampling control method using the sampling control circuit according to any one of claims 1-4 above, characterized in that the steps It includes: Step 1: The ignition controller (1) receives a sampling start signal and checks whether the start condition is met. If the start condition is met, ignition start output control signals are sent simultaneously from multiple output ends. Step 2: When the base of the trigger triode Q1 inside the ignition start trigger (2) receives the ignition start output control signal, the trigger triode Q1 is turned on. The positive electrode of the ignition power supply (6) is connected to the resistor R1, and the ignition voltages of multiple ignition trigger branches are connected in parallel and then delivered to the ignition device (3). Step 3: The ignition power supply (6) inside the ignition start trigger (2) is connected to the ignition device (3). The current in the cable between the ignition start trigger (2) and the ignition device (3) increases instantaneously. The current transformer H1 senses the instantaneous current and sends the signal to the signal amplifier (4). Step 4: The signal amplifier (4) receives the induction signal of the current transformer H1, amplifies the signal and sends it to the ignition acquisition system (5), and the ignition acquisition system (5) records the ignition moment.

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