Ignition control system based on energy pulse and method thereof

Abstract

The application provides an ignition control system based on energy pulse and a method thereof, which can prevent the ignition device from being triggered by external interference such as stray current, and improve safety and reliability. The system comprises a signal receiving module for receiving an external ignition pulse signal; a main control module connected with the signal receiving module, for processing the external ignition pulse signal to output a corresponding ignition control signal; and a switch module connected with the main control module, for controlling the ignition switch according to the control signal. The main control module is internally provided with a voltage comparison unit connected with a control unit, for receiving the external ignition pulse signal, performing voltage comparison, and then outputting a comparison result signal to the control unit; a decoding unit for decoding the external ignition pulse signal and outputting a decoding signal to the control unit; and the control unit connected with the switch module, for outputting a corresponding ignition control signal after receiving two signals simultaneously.

Description

Technical Field

[0001] This invention relates to the field of ignition technology, particularly to ignition devices for automotive airbags, specifically an ignition control system and method based on energy pulses. Background Technology

[0002] Airbag igniters, also known as automotive airbag igniters or simply igniters, are core components of automotive airbag gas generators and miniature gas generators. They serve as the primary energy triggering and output mechanism in the airbag gas generator, igniting the propellant gas. Currently, the ignition control schemes for igniters on the market are relatively simple; the igniter will detonate immediately after a certain current is applied. However, in reality, external interference such as stray currents may exist, leading to false triggering of the igniter. Therefore, the safety and reliability of igniters cannot be guaranteed, according to the fuse industry. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides an ignition control system and method based on energy pulses, which can prevent ignition devices from being falsely triggered due to external interference such as stray currents, thereby improving safety and reliability.

[0004] The present invention adopts the following technical solution: an ignition control system based on energy pulse, comprising: a signal receiving module for receiving external ignition pulse signals;

[0005] The main control module, connected to the signal receiving module, is used to process external ignition pulse signals to output corresponding ignition control signals;

[0006] A switch module, connected to the main control module, is used to control the ignition switch according to control signals;

[0007] The main control module includes a built-in voltage comparison unit, a decoding unit, and a control unit; wherein...

[0008] The voltage comparison unit is connected to the control unit and is used to receive external ignition pulse signals, perform voltage comparisons, and then output the comparison result signal to the control unit.

[0009] The decoding unit receives an external ignition pulse signal, decodes it, and outputs the decoded signal to the control unit.

[0010] The control unit is connected to the switch module so that it can output a corresponding ignition control signal after receiving two signals at the same time.

[0011] Furthermore, the main control module also has a built-in filtering and amplification unit connected to the decoding unit, which is used to receive external ignition pulse signals, filter and amplify them, and output the filtered and amplified signals to the decoding unit.

[0012] Furthermore, the main control module also includes a triggering unit and a charging unit; wherein the triggering unit is connected to the signal receiving module and is used to receive the ignition pulse signal output by the signal receiving module and to transmit the signal according to the triggering conditions;

[0013] The charging unit is connected between the trigger unit and the voltage comparison unit, and is used to receive the signal output by the trigger unit, accumulate charge, and then output the signal to the voltage comparison unit.

[0014] Furthermore, the signal receiving module includes resistors R1-R5, capacitors C1-C5, Zener diodes D1 and D2, and a voltage regulator U1. The voltage regulator U1 uses a TPS78233DDCR chip. One end of resistor R1 is connected to an external ignition pulse signal. The other end of resistor R1 is connected to resistor R2, one end of capacitor C1, and the negative terminal of Zener diode D1, and then connected to the main control module. The other end of resistor R2 and capacitor C1 is connected to the positive terminal of Zener diode D1 and then grounded. One end of resistors R3 and R4 is connected to the main control module. The control module has the following connection: the other end of resistor R3 is connected to a voltage of 3.3V; the other end of resistor R4 is grounded; the negative terminal of Zener diode D2 is connected to resistor R5, one end of capacitors C2 and C3, and pin 1 of voltage regulator U1, and then connected to power supply VCC; the other end of resistor R5 is connected to pin 3 of voltage regulator U1; pin 5 of voltage regulator U1 is connected to one end of capacitors C4 and C5, and then connected to a voltage of 3.3V; pins 2 and 4 of voltage regulator U1 are connected to the other ends of capacitors C2, C3, C4, and C5, and the positive terminal of Zener diode D2, and then grounded.

[0015] Furthermore, the switching module is connected to both the ignition capacitor C and the ignition resistor R. The switching module includes resistors R6 to R11, a Zener diode D3, a transistor Q1, and MOSFETs Q2 to Q4. One end of resistor R7 is connected to the main control module, and the other end of resistor R7 is connected to one end of resistor R8 and the base of transistor Q1. The other end of resistor R8 is connected to the emitter of transistor Q1 and then grounded. The collector of transistor Q1 is connected to one end of resistor R9, and the other end of resistor R9 is connected to one end of resistor R10 and the gate of MOSFET Q2. The other end of resistor R10 is connected to the source of MOSFET Q2. The drain of MOSFET Q2 is connected to the positive terminal of Zener diode D3. The negative terminal of Zener diode D3 is connected to one end of ignition capacitor C and ignition resistor R. One end of resistor R11 is connected to the main control module. The other end of resistor R11 is connected to the other end of ignition resistor R and the drain of MOSFET Q3. The gate of MOSFET Q3 is connected to one end of resistor R6 and then to the main control module. The other end of ignition capacitor C is connected to the source of MOSFET Q3 and the drain of MOSFET Q4. The gate of MOSFET Q4 is connected to the main control module. The other end of resistor R6 is connected to the source of MOSFET Q4 and then grounded.

[0016] An ignition control method based on energy pulses includes the following steps:

[0017] S1. Receives external ignition pulse signal and splits the external ignition pulse signal into two paths;

[0018] S2. One ignition pulse signal passes through the voltage comparison unit and is compared with the threshold. If it is greater than the threshold, the first set of ignition commands is generated and sent to the control unit. If it is less than the threshold, the system continues to wait. The other ignition pulse signal is decoded by the decoding unit. If the decoded signal is an ignition signal, the second set of ignition commands is generated and sent to the control unit.

[0019] S3. If the control unit receives the first ignition command and the second ignition command at the same time, the control switch module will perform the corresponding ignition switch control.

[0020] Furthermore, step S2 also includes:

[0021] One ignition pulse signal first enters the trigger unit. If the ignition pulse signal voltage is higher than the reference voltage, the trigger unit outputs a signal to the charging unit and accumulates charge in the charging unit until the charging voltage exceeds the threshold in the voltage comparison unit. Then, the first set of ignition commands is generated and sent to the control unit.

[0022] Furthermore, the other ignition pulse signal is filtered and amplified by the filtering and amplification unit, and then decoded by the decoding unit.

[0023] The beneficial effects of this invention are that the external ignition pulse signal is divided into two paths and enters the main control module. Only when the pulse charging voltage exceeds the set threshold and an ignition decoding command is received can the switch module control the switch to ignite the ignition resistor. The ignition resistor is completely isolated from the ignition pulse signal, thereby achieving safe ignition and preventing false triggering of the ignition device due to external interference such as stray current. It has high safety and reliability. Attached Figure Description

[0024] Figure 1 This is a structural block diagram of the present invention;

[0025] Figure 2 This is the circuit schematic diagram of the present invention. Detailed Implementation

[0026] like Figure 1 , Figure 2 As shown, the present invention provides an ignition control system based on energy pulses, comprising: a signal receiving module 1, used to receive external ignition pulse signals;

[0027] The main control module 2 is connected to the signal receiving module 1 and is used to process external ignition pulse signals to output corresponding ignition control signals.

[0028] Switch module 3, connected to main control module 2, is used to control the ignition switch according to control signals;

[0029] The main control module 2 includes a built-in voltage comparison unit 6, a decoding unit 7, and a control unit 8; among which,

[0030] The voltage comparison unit 6 is connected to the control unit 8 and is used to receive external ignition pulse signals, perform voltage comparisons, and then output the comparison result signal to the control unit 8.

[0031] After receiving an external ignition pulse signal, the decoding unit 7 decodes the signal and outputs the decoded signal to the control unit 8.

[0032] The control unit 8 is connected to the switch module 3 so that it can output the corresponding ignition control signal after receiving two signals at the same time.

[0033] The main control module 2 also includes:

[0034] The filtering and amplification unit 9 is connected to the decoding unit 7. It is used to receive external ignition pulse signals, filter and amplify them, and output the filtered and amplified signals to the decoding unit 7.

[0035] The triggering unit 4 is connected to the signal receiving module 1 and is used to receive the ignition pulse signal output by the signal receiving module 1 and transmit the signal according to the triggering condition; the triggering condition is that if the ignition pulse signal voltage is higher than the reference voltage, the triggering unit 4 outputs a signal to the charging unit 5.

[0036] The charging unit 5 is connected between the trigger unit 4 and the voltage comparison unit 6. It is used to receive the signal output by the trigger unit 4, accumulate charge, and then output the signal to the voltage comparison unit 6. The charging unit 5 uses a charge pump.

[0037] The voltage comparison unit 6, decoding unit 7, control unit 8, filtering and amplification unit 9, and triggering unit 4 all use existing circuits or chips.

[0038] Signal receiving module 1 includes resistors R1-R5, capacitors C1-C5, Zener diodes D1 and D2, and voltage regulator U1. Voltage regulator U1 uses a TPS78233DDCR chip. One end of resistor R1 is connected to an external ignition pulse signal. The other end of resistor R1 is connected to resistor R2, one end of capacitor C1, and the negative terminal of Zener diode D1, and then connected to trigger unit 4 in main control module 2. The other end of resistor R2 and capacitor C1 is connected to the positive terminal of Zener diode D1 and then grounded. One end of resistors R3 and R4 is connected to voltage comparison unit 6 in main control module 2. R3 and R4 together determine the threshold value in the final voltage comparison unit 6. The other end of resistor R3 is connected to a voltage of 3.3V, and the other end of resistor R4 is grounded. The negative terminal of Zener diode D2 is connected to resistor R5, one end of capacitors C2 and C3, and pin 1 of voltage regulator U1, and then connected to the power supply VCC. The other end of resistor R5 is connected to pin 3 of voltage regulator U1. Pin 5 of voltage regulator U1 is connected to one end of capacitors C4 and C5, and then connected to a voltage of 3.3V. Pins 2 and 4 of voltage regulator U1 are connected to the other ends of capacitors C2, C3, C4, and C5, and the positive terminal of Zener diode D2, and then grounded.

[0039] Switching module 3 is connected to both the ignition capacitor C and the ignition resistor R. Switching module 3 includes resistors R6 to R11, a Zener diode D3, a transistor Q1, and MOSFETs Q2 to Q4. One end of resistor R7 is connected to the output terminal of control unit 8 in main control module 2. The other end of resistor R7 is connected to one end of resistor R8 and the base of transistor Q1. The other end of resistor R8 is connected to the emitter of transistor Q1 and then grounded. The collector of transistor Q1 is connected to one end of resistor R9. The other end of resistor R9 is connected to one end of resistor R10 and the gate of MOSFET Q2. The other end of resistor R10 is connected to the source of MOSFET Q2. The drain of MOSFET Q2 is connected to... Connect the positive terminal of Zener diode D3. Connect the negative terminal of Zener diode D3 to one end of ignition capacitor C and ignition resistor R. Connect one end of resistor R11 to the output terminal of control unit 8 in main control module 2. Connect the other end of resistor R11 to the other end of ignition resistor R and the drain of MOSFET Q3. Connect the gate of MOSFET Q3 to one end of resistor R6 and then to the output terminal of control unit 8 in main control module 2. Connect the other end of ignition capacitor C to the source of MOSFET Q3 and the drain of MOSFET Q4. Connect the gate of MOSFET Q4 to the output terminal of control unit 8 in main control module 2. Connect the other end of resistor R6 to the source of MOSFET Q4 and then to ground.

[0040] Figure 2 In this configuration, VH_PULSE serves as the ignition pulse signal terminal; VBUS serves as the bus voltage terminal.

[0041] An ignition control method based on energy pulses includes the following steps:

[0042] S1. Receives external ignition pulse signal and splits the external ignition pulse signal into two paths;

[0043] S2. One ignition pulse signal first enters the trigger unit 4. If the ignition pulse signal voltage is higher than the reference voltage, the trigger unit 4 outputs a signal to the charging unit 5 and accumulates charge in the charging unit 5 until the charging voltage exceeds the threshold in the voltage comparison unit 6. Then, the first set of ignition commands is generated and sent to the control unit 8. If the charging voltage is less than the threshold, then continue to wait.

[0044] The other ignition pulse signal is filtered and amplified by the filtering and amplification unit 9, and then decoded by the decoding unit 7. If the decoded signal is an ignition signal, a second set of ignition commands is generated and sent to the control unit 8.

[0045] When S3 and control unit 8 simultaneously receive the first ignition command and the second ignition command, control switch module 3 performs corresponding ignition switch control.

[0046] In this invention, after one of the external ignition pulse signals enters the trigger unit 4, a signal will be output to the charging unit 5 to accumulate charge only when the ignition pulse signal is higher than the reference voltage of the trigger unit 4. After the ignition pulse signal continues to charge under certain conditions, that is, only when the charge exceeds the threshold in the voltage comparison unit 6, will the first set of ignition commands be generated and sent to the control unit 8. At the same time, the ignition process will be started only after the received decoded command is the corresponding ignition command. The control switch module 3 will perform corresponding ignition switch control, that is, turn on the MOS transistor Q3 to ignite the ignition resistor R, or turn on the transistor Q1 and the MOS transistor Q2 to charge the ignition capacitor C, thus achieving the effect of safe ignition.

[0047] In this invention, all switching transistors are off by default, and the ignition is upgraded from the current single-energy ignition to energy pulse ignition. This means that the ignition resistor R is completely isolated from the external ignition pulse signal, which can avoid false triggering and false detonation caused by stray current. The ignition process will only proceed when both conditions are met: the charging voltage of the ignition pulse signal exceeds the set threshold and an ignition command is received. This ensures high safety, greatly improves the safety of the ignition device, and reduces the design requirements and manufacturing difficulty of the pyrotechnic components of the ignition device.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An ignition control system based on energy pulses, characterized in that, include: The signal receiving module is used to receive external ignition pulse signals; The main control module, connected to the signal receiving module, is used to process external ignition pulse signals to output corresponding ignition control signals; A switch module, connected to the main control module, is used to control the ignition switch according to control signals; The main control module includes a built-in voltage comparison unit, a decoding unit, and a control unit; wherein... The voltage comparison unit is connected to the control unit and is used to receive external ignition pulse signals, perform voltage comparisons, and then output the comparison result signal to the control unit. The decoding unit receives an external ignition pulse signal, decodes it, and outputs the decoded signal to the control unit. The control unit is connected to the switch module so that it can output a corresponding ignition control signal after receiving two signals at the same time.

2. The ignition control system based on energy pulses according to claim 1, characterized in that, The main control module also has a built-in filtering and amplification unit, which is connected to the decoding unit. It is used to receive external ignition pulse signals, filter and amplify them, and output the filtered and amplified signals to the decoding unit.

3. The ignition control system based on energy pulses according to claim 1, characterized in that, The main control module also includes a trigger unit and a charging unit; wherein, the trigger unit is connected to the signal receiving module and is used to receive the ignition pulse signal output by the signal receiving module and to transmit the signal according to the triggering conditions; The charging unit is connected between the trigger unit and the voltage comparison unit, and is used to receive the signal output by the trigger unit, accumulate charge, and then output the signal to the voltage comparison unit.

4. The ignition control system based on energy pulses according to claim 3, characterized in that, The signal receiving module includes resistors R1-R5, capacitors C1-C5, Zener diodes D1 and D2, and a voltage regulator U1. The voltage regulator U1 uses a TPS78233DDCR chip. One end of resistor R1 is connected to an external ignition pulse signal. The other end of resistor R1 is connected to resistor R2, one end of capacitor C1, and the negative terminal of Zener diode D1, and then connected to the main control module. The other end of resistor R2 and capacitor C1 is connected to the positive terminal of Zener diode D1 and then grounded. One end of resistors R3 and R4 is connected to the main control module. The circuit consists of a resistor R3 connected to a voltage of 3.3V, a resistor R4 connected to ground, a Zener diode D2 whose negative terminal is connected to a resistor R5, one end of capacitors C2 and C3, and pin 1 of a voltage regulator U1, and then connected to the power supply VCC. The other end of a resistor R5 is connected to pin 3 of a voltage regulator U1. Pin 5 of a voltage regulator U1 is connected to one end of capacitors C4 and C5, and then connected to a voltage of 3.3V. Pins 2 and 4 of a voltage regulator U1 are connected to the other ends of capacitors C2, C3, C4, and C5, and the positive terminal of a Zener diode D2, and then connected to ground.

5. The ignition control system based on energy pulses according to claim 1, characterized in that, The switching module is connected to both the ignition capacitor C and the ignition resistor R. The switching module includes resistors R6-R11, a Zener diode D3, a transistor Q1, and MOSFETs Q2-Q4. One end of resistor R7 is connected to the main control module. The other end of resistor R7 is connected to one end of resistor R8 and the base of transistor Q1. The other end of resistor R8 is connected to the emitter of transistor Q1 and then grounded. The collector of transistor Q1 is connected to one end of resistor R9. The other end of resistor R9 is connected to one end of resistor R10 and the gate of MOSFET Q2. The other end of resistor R10 is connected to the source of MOSFET Q2. The drain of MOSFET Q2 is connected to the positive terminal of Zener diode D3. The negative terminal of Zener diode D3 is connected to one end of the ignition capacitor C and the ignition resistor R. One end of resistor R11 is connected to the main control module. The other end of resistor R11 is connected to the other end of the ignition resistor R and the drain of MOSFET Q3. The gate of MOSFET Q3 is connected to one end of resistor R6 and then to the main control module. The other end of the ignition capacitor C is connected to the source of MOSFET Q3 and the drain of MOSFET Q4. The gate of MOSFET Q4 is connected to the main control module. The other end of resistor R6 is connected to the source of MOSFET Q4 and then grounded.

6. An ignition control method based on energy pulses, characterized in that, An energy pulse-based ignition control system as described in any one of claims 1 to 5 is employed, the method comprising the following steps: S1. Receives external ignition pulse signal and splits the external ignition pulse signal into two paths; S2. One ignition pulse signal passes through the voltage comparison unit and is compared with the threshold. If it is greater than the threshold, the first set of ignition commands is generated and sent to the control unit. If it is less than the threshold, the system continues to wait. The other ignition pulse signal is decoded by the decoding unit. If the decoded signal is an ignition signal, the second set of ignition commands is generated and sent to the control unit. S3. If the control unit receives the first ignition command and the second ignition command at the same time, the control switch module will perform the corresponding ignition switch control.

7. The ignition control method based on energy pulses according to claim 6, characterized in that, Step S2 further includes: One ignition pulse signal first enters the trigger unit. If the ignition pulse signal voltage is higher than the reference voltage, the trigger unit outputs a signal to the charging unit and accumulates charge in the charging unit until the charging voltage exceeds the threshold in the voltage comparison unit. Then, the first set of ignition commands is generated and sent to the control unit.

8. The ignition control method based on energy pulses according to claim 6, characterized in that, The other ignition pulse signal is filtered and amplified by the filtering and amplification unit, and then decoded by the decoding unit.

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