Airbag signal wake-up circuit and method and vehicle

Abstract

The embodiment of the invention relates to the technical field of automobile electronics, in particular to a safety air bag signal awakening circuit and method and a vehicle. The safety air bag signal awakening circuit comprises an isolation output module, a comparison output module, a power supply module and a main control module; the airbag signal is processed through the isolation output module and the comparison output module to generate the isolation signal, the power supply module provides a power supply according to the isolation signal or the power supply signal, and the master control module is awakened and identifies the airbag state, so that the problem of reliably monitoring the airbag signal in a low-power-consumption or power-off state of a vehicle is solved; the system has the advantages of reliably monitoring the safety airbag signal under the low-power-consumption or power-off state of the vehicle, awakening the main control module in time and identifying the airbag state, thereby improving the timeliness and effectiveness of the safety guarantee of passengers.

Description

Technical Field

[0001] This invention relates to the field of automotive electronics manufacturing technology, specifically to an airbag signal wake-up circuit, method, and vehicle. Background Technology

[0002] With the rapid development of the automotive industry and the continuous growth of vehicle ownership, the functions of in-vehicle electronic systems are becoming increasingly complex, placing higher demands on the real-time monitoring and response to vehicle safety status. Among these, the airbag deployment status is crucial information related to emergency rescue in accidents. It is typically output as a PWM signal with a specific duty cycle or frequency; for example, 1Hz represents a normal airbag operation, and 16Hz represents airbag deployment. A common current technical solution is to directly connect this PWM signal to the PWM capture interface of a microcontroller (MCU). The MCU then analyzes the signal characteristics in real time and executes corresponding controls, such as triggering an emergency call (ECALL) function.

[0003] However, this solution has significant limitations in practical applications. To ensure low-power operation, especially when the vehicle is off or stationary for extended periods, the in-vehicle product needs to periodically enter sleep or complete shutdown mode. In sleep mode, the MCU enters a sleep state to reduce power consumption, at which point its conventional PWM detection function cannot operate, and it can only respond to simple interrupt signals, resulting in the inability to continuously identify the PWM-based airbag status. In complete shutdown mode, the MCU power supply is cut off, completely losing its signal detection capability. Therefore, existing technology struggles to reliably monitor airbag signals in low-power or power-off states, which may cause response delays in emergencies, affecting the timeliness and effectiveness of safety assurance. Summary of the Invention

[0004] In view of the above problems, embodiments of the present invention provide an airbag signal wake-up circuit, method and vehicle, which solves the problem that the prior art is difficult to reliably monitor the airbag signal in the low power consumption or power failure state of the system, which may cause response delay in emergency situations and affect the timeliness and effectiveness of safety protection.

[0005] In a first aspect, the present invention provides an airbag signal wake-up circuit, comprising: An isolation output module is connected to the signal output terminal of the airbag to obtain the airbag signal. The isolation output module is provided with a first signal terminal, which outputs a first isolation signal according to the airbag signal. A comparison output module is connected to the signal output terminal of the airbag to obtain the airbag signal. The comparison output module is provided with a second signal terminal, which outputs a second isolation signal according to the airbag signal. A power supply module is connected to the second signal terminal. The power supply module is provided with a power supply terminal, which outputs power supply according to the second isolation signal or the signal from the vehicle power supply terminal. The system includes a main control module connected to the first signal terminal, the second signal terminal, and the power supply terminal. The main control module identifies the airbag signal based on the first isolation signal and wakes up the main control module through the second isolation signal.

[0006] In some alternative configurations, the main control module is provided with a first input terminal, a second input terminal, and a first power supply terminal. The first input terminal is connected to the first signal terminal, the second input terminal is connected to the second signal terminal, and the first power supply terminal is connected to the power supply terminal.

[0007] In some alternative embodiments, the comparison output module includes an integrator circuit, a comparator circuit, and an isolation circuit. The integrating circuit is connected to the signal output terminal and is used to convert the airbag signal into a triangular wave signal for output. The comparison circuit is connected to the integrator circuit and is used to compare the triangular wave signal with the reference signal and output a comparison signal. The isolation circuit is connected to the output terminal of the comparator circuit and is used to output a second isolation signal based on the comparison signal.

[0008] In some alternative embodiments, the integrating circuit includes a first resistor and a first capacitor, with a first end of the first resistor connected to the signal output terminal and a second end of the first resistor connected to the comparator circuit and a first end of the first capacitor, and the second end of the first capacitor grounded.

[0009] In some alternative embodiments, the comparator circuit includes a comparator chip, a first voltage regulator circuit, and a second voltage regulator circuit. The integrator circuit is connected to the inverting input terminal of the comparator chip through the first voltage regulator circuit. The non-inverting input terminal of the comparator chip is connected to a reference voltage source through the second voltage regulator circuit to obtain a reference signal. The first output terminal of the comparator chip is connected to the isolation circuit.

[0010] In some alternative embodiments, the isolation circuit includes a first MOSFET, a second resistor, a third resistor, and a first diode. The gate of the first MOS transistor is connected to the first output terminal of the comparator chip, and the drain is the second signal terminal and connected to the first terminal of the second resistor and the first terminal of the first diode; the second terminal of the second resistor is connected to the reference voltage source, the second terminal of the first diode is connected to the second output terminal of the comparator chip and the first terminal of the third resistor, and the second terminal of the third resistor is connected to the non-inverting input terminal of the comparator chip.

[0011] In some alternative configurations, the power supply module includes a power chip, with the power supply terminal disposed on the power chip; the power chip also includes a second power input terminal and an enable control terminal, the second power input terminal being connected to an external power source for power supply, and the enable control terminal being connected to a second signal terminal and a vehicle power supply terminal via an OR gate.

[0012] In some alternative configurations, the isolated output module includes a Schottky diode, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first transistor, a second transistor, a second capacitor, and a third capacitor; The signal output terminal of the airbag is connected via a Schottky diode, the first terminals of the fourth and fifth resistors, the first terminal of the sixth resistor, and the first terminal of the second capacitor. The second end of the sixth resistor is connected to the base of the first transistor, the emitter of the first transistor is connected to the second end of the fifth resistor and an external power supply, and the collector is connected to the base of the second transistor through the seventh resistor. The collector of the second transistor is connected to the first end of the eighth resistor and the first end of the ninth resistor, and the emitter is grounded; The second end of the eighth resistor is connected to the reference voltage source, and the second end of the ninth resistor is a first signal terminal and is connected to the first end of the third capacitor; the second end of the second capacitor and the second end of the third capacitor are connected to the power supply ground.

[0013] In a second aspect, the present invention provides an airbag signal wake-up method, based on the above-mentioned airbag signal wake-up circuit, the method comprising: Obtain the airbag signal from the airbag; Based on the airbag signal, an isolation output is generated to produce a first isolation signal; The airbag signal is integrated and converted to generate a triangular wave signal, and the triangular wave signal is compared with a preset reference signal. A second isolation signal is generated based on the comparison result. The vehicle's main control module is activated based on the second isolation signal, and the current status of the airbag is determined based on the first isolation signal.

[0014] Thirdly, the present invention provides a vehicle for performing the above-described airbag signal wake-up method.

[0015] This invention provides an airbag signal wake-up circuit, method, and vehicle. Its advantages are as follows: The airbag signal wake-up circuit includes an isolation output module, a comparison output module, a power supply module, and a main control module. This invention processes airbag signals to generate an isolation signal through the isolation output module and the comparison output module. The power supply module provides power based on the isolation signal or a power signal. The main control module is then woken up and identifies the airbag status. This solves the problem of reliably monitoring airbag signals when the vehicle is under low power consumption or power failure. It has the advantages of reliably monitoring airbag signals when the vehicle is under low power consumption or power failure, promptly waking up the main control module, and identifying the airbag status, thereby improving the timeliness and effectiveness of occupant safety protection.

[0016] The above description is merely an overview of the technical solutions of the embodiments of the present invention. In order to better understand the technical means of the embodiments of the present invention and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0017] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of the structure of the airbag signal wake-up circuit provided by the present invention is shown; Figure 2 The circuit schematic diagrams of the main control module and power supply module provided by the present invention are shown. Figure 3 The circuit schematic of the integrating circuit provided by the present invention is shown; Figure 4 The circuit schematics of the comparator circuit and isolation circuit provided by the present invention are shown. Figure 5 The circuit schematic of the isolation module provided by the present invention is shown; Figure 6 A flowchart illustrating the airbag signal wake-up method provided by the present invention is shown.

[0018] in, 100. Airbag signal wake-up circuit; 110. Isolation output module; 120. Comparison output module; 121. First voltage regulator circuit; 122. Second voltage regulator circuit; 130. Power supply module; 140. Main control module; 200. Airbags; MCU (Microcontroller Unit), main control chip; U1 (Power supply chip); U2 (Comparator chip); U3 (OR gate); MOS1, first MOSFET; Q1, first transistor; Q2, second transistor; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; C1, the first capacitor; C2, the second capacitor; C3, the third capacitor; D1, first diode; D2, Schottky diode; AIRBAG_IN, signal output terminal; SRS_INT, first signal terminal; AIRBAG2uP_DET, second signal terminal; MCU_PWM, first input terminal; MCU_INT, second input terminal; MCU_VCC, first power supply terminal; U1_Vout, power supply terminal; U1_Vin, second power supply input terminal; U1_EN, enable control terminal. Detailed Implementation

[0019] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0020] Example 1: Figure 1 The present invention illustrates a first embodiment of an airbag signal wake-up circuit, which includes an isolation output module 110, a comparison output module 120, a power supply module 130, and a main control module 140. The isolation output module 110 is connected to the airbag signal output terminal AIRBAG_IN to obtain the airbag signal. The isolation output module 110 is equipped with a first signal terminal SRS_INT, which outputs a first isolation signal based on the airbag signal. The function of the isolation output module 110 is to receive the signal from the airbag and convert it into an isolated signal output. This isolation process helps protect subsequent circuits from potential interference or high voltage from the airbag signal, while ensuring signal integrity. The airbag signal typically refers to the electrical signal output by the airbag system to indicate its operating status. This signal can be a pulse width modulation (PWM) signal, whose frequency or duty cycle may encode different state information such as normal, fault, or triggered airbag status. The first isolation signal is generated by the isolation output module 110 and is the output of the airbag signal after isolation processing. This signal is mainly used by the main control module 140 for detailed identification and status judgment of the airbag signal.

[0021] The comparison output module 120 is connected to the airbag signal output terminal AIRBAG_IN to obtain the airbag signal. This module 120 has a second signal terminal AIRBAG2uP_DET, which outputs a second isolation signal based on the airbag signal. The function of the comparison output module 120 is to process the received airbag signal and generate another isolation signal through a comparison mechanism. This module is typically used to detect or judge specific characteristics of the airbag signal, such as whether the signal frequency or duty cycle meets preset conditions. The second isolation signal, generated by the comparison output module 120, is the output of the airbag signal after comparison processing. This signal is mainly used to trigger the wake-up mechanism of the main control module 140, causing it to enter the working state from a low-power state.

[0022] The power supply module 130 is connected to the second signal terminal AIRBAG2uP_DET. The power supply module 130 has a power supply terminal U1_Vout, which outputs power based on the second isolation signal or the vehicle power supply signal. The power supply module 130 provides a stable power supply based on specific triggering conditions (e.g., a signal from the comparator output module 120 or the vehicle's own power signal). This power supply is mainly used to provide operating energy to other functional modules in the system, ensuring their normal operation. The power supply output from the power supply module 130 provides the operating voltage to the main control module 140 and other components in the circuit. Its output is controlled by the second isolation signal or the vehicle power supply signal to achieve on-demand power supply and energy saving.

[0023] The main control module 140 is connected to the first signal terminal SRS_INT, the second signal terminal AIRBAG2uP_DET, and the power supply terminal U1_Vout. The main control module 140 identifies the airbag signal based on the first isolation signal and wakes up via the second isolation signal. As the core control unit of the entire circuit, the main control module 140 is configured to receive and parse signals from different modules. Based on the received signals, this module performs corresponding logical judgments and control operations, such as identifying the airbag status, waking up the system, or triggering other vehicle functions.

[0024] In the above scheme, the isolation output module 110 is configured to connect to the signal output terminal AIRBAG_IN of the airbag to obtain the airbag signal emitted by the airbag system. After receiving the airbag signal, the isolation output module 110 processes it and outputs a first isolation signal from its set first signal terminal SRS_INT. This isolation processing can be implemented in various ways, such as electrical isolation through optocouplers or magnetic isolation through transformers, to ensure the reliability and safety of signal transmission while avoiding interference that may be caused by direct connection.

[0025] The comparison output module 120 is also connected to the airbag signal output terminal AIRBAG_IN to acquire the same airbag signal. This module analyzes and compares the airbag signal and outputs a second isolation signal from its set second signal terminal AIRBAG2uP_DET. For example, the comparison output module 120 can simply detect the presence of the airbag signal or whether it meets a certain basic voltage threshold, and output a high-level second isolation signal when the signal is present or reaches the threshold.

[0026] The power supply module 130 is connected to the second signal terminal AIRBAG2uP_DET of the aforementioned comparison output module 120. The power supply module 130 is equipped with a power supply terminal U1_Vout, whose function is to output power according to the second isolation signal or the signal from the vehicle power supply terminal. For example, when the second isolation signal becomes active, the power supply module 130 is triggered, thereby outputting operating power to the power supply terminal U1_Vout. Furthermore, the power supply module 130 can also directly output power when the vehicle power supply terminal detects that the vehicle is in an active state, ensuring that the main control module 140 can obtain the necessary energy in different scenarios.

[0027] The main control module 140 is configured to connect to the first signal terminal SRS_INT of the isolation output module 110, the second signal terminal AIRBAG2uP_DET of the comparison output module 120, and the power supply terminal U1_Vout of the power supply module 130. The main control module 140 receives a first isolation signal from the first signal terminal SRS_INT and identifies the current state of the airbag based on this signal, such as determining whether the airbag is functioning normally, malfunctioning, or has been triggered. Simultaneously, the main control module 140 uses the second isolation signal from the second signal terminal AIRBAG2uP_DET to perform its own wake-up operation. For example, when the main control module 140 is in a sleep state, a valid change in the second isolation signal can serve as an interrupt signal, prompting the main control module 140 to switch from a low-power mode to a normal operating mode, thereby enabling it to promptly process the first isolation signal and execute subsequent control logic.

[0028] The airbag signal wake-up circuit in this embodiment preprocesses the airbag signal through an independent isolation output module 110 and a comparison output module 120, and intelligently wakes up the main control module 140 using the second isolation signal generated by the comparison output module 120. Simultaneously, the power supply module 130 provides power as needed. Therefore, even when the vehicle is in a low-power sleep or completely off state, the system can reliably monitor the airbag signal, ensuring that the main control module 140 can be woken up promptly and the airbag status can be identified in an emergency. This effectively avoids response delays and improves the timeliness and effectiveness of vehicle safety protection.

[0029] In some implementations, see Figure 2The main control module 140 is equipped with a first input terminal MCU_PWM, a second input terminal MCU_INT, and a first power supply terminal MCU_VCC. The first input terminal MCU_PWM is connected to the first signal terminal SRS_INT, the second input terminal MCU_INT is connected to the second signal terminal AIRBAG2uP_DET, and the first power supply terminal MCU_VCC is connected to the power supply terminal U1_Vout.

[0030] By explicitly defining the first input terminal MCU_PWM, the second input terminal MCU_INT, and the first power supply terminal MCU_VCC on the main control module 140, and connecting them to the first signal terminal SRS_INT, the second signal terminal AIRBAG2uP_DET, and the power supply terminal U1_Vout respectively, this application effectively solves the problem caused by the ambiguous interface definition of the main control module 140. Specifically, the setting of the first input terminal MCU_PWM and the second input terminal MCU_INT provides a dedicated and optimized channel for the main control module 140 to receive the first isolation signal and the second isolation signal, significantly improving the stability and anti-interference capability of signal transmission, and ensuring that the main control module 140 can accurately identify the airbag signal and be reliably woken up. At the same time, the setting of the first power supply terminal MCU_VCC provides an independent and stable power supply path for the main control module 140, effectively avoiding the impact of power supply noise and voltage fluctuations on the normal operation of the main control module 140, thereby ensuring the reliable operation of the main control module 140 under various operating conditions. This explicit interface design simplifies circuit layout, reduces system integration complexity, and fundamentally improves the reliability and performance of the entire airbag signal wake-up circuit.

[0031] In some implementations, see Figures 3-4 The comparison output module 120 includes an integrator circuit, a comparator circuit, and an isolation circuit. The integrator circuit is connected to the airbag signal output terminal AIRBAG_IN and converts the airbag signal into a triangular wave signal for output. The comparator circuit is connected to the integrator circuit and compares the triangular wave signal with a reference signal, outputting a comparison signal. The isolation circuit is connected to the output terminal of the comparator circuit and isolates and outputs a second isolation signal based on the comparison signal.

[0032] Specifically, an integrator circuit is an electronic circuit capable of integrating input signals. Its function is to convert the airbag signal acquired at the AIRBAG_IN terminal of the airbag into a triangular wave signal for output. Airbag signals often contain transient noise or irregular waveforms; through processing by the integrator circuit, these signals can be smoothed, and their amplitude variations can be converted into triangular waveforms with a specific slope. This conversion helps filter out high-frequency noise and provides a more stable and predictable signal for subsequent comparison processing. Integrator circuits can be implemented in various ways; for example, they can be constructed using an RC integrator circuit composed of resistors and capacitors, or configured as an integrator using an operational amplifier to provide more accurate integration characteristics.

[0033] A comparator circuit is an electronic circuit used to compare the magnitudes of two input signals. In this application, its function is to receive a triangular wave signal output from an integrator circuit, compare it with a preset reference signal, and output a comparison signal based on the comparison result. When the triangular wave signal reaches or exceeds (or falls below) a specific threshold of the reference signal, the output state of the comparator circuit flips, thereby converting the analog triangular wave signal into a clear digital signal. This conversion process effectively extracts the valid information from the analog signal and converts it into a digital logic level, providing a clear trigger condition for subsequent isolation processing. The comparator circuit can be implemented using a dedicated comparator chip or by configuring an operational amplifier in comparator mode.

[0034] An isolation circuit is a circuit that electrically separates the input and output terminals to prevent the propagation of potential differences, noise, or faults between different circuit regions. In this application, the isolation circuit is connected to the output terminal of the comparator circuit, and its function is to isolate and output a second isolation signal based on the comparison signal output by the comparator circuit. Through the isolation circuit, potential interference or high-voltage transients from the airbag signal path can be effectively blocked, protecting the main control module 140 from damage and ensuring the purity and reliability of the second isolation signal. Isolation circuits can be implemented in various ways, such as using optocouplers, digital isolators, transformer isolators, or circuits based on specific transistor configurations to achieve electrical isolation.

[0035] Through the above technical solution, the comparison output module 120 no longer directly compares the original airbag signal, but first converts the airbag signal into a smooth triangular wave signal through an integrator circuit. This preprocessing step can effectively suppress transient noise and glitches that may exist in the airbag signal, making the signal waveform more stable and predictable. Subsequently, the comparison circuit accurately compares the smoothed triangular wave signal with a preset reference signal, thereby generating a clear and reliable comparison signal, avoiding false triggering caused by signal fluctuations or noise. Finally, the isolation circuit electrically isolates the comparison signal, generating a second isolation signal. This not only ensures electrical isolation between the main control module 140 and the airbag signal path, preventing potential electromagnetic interference and high voltage surges, but also further improves the purity and reliability of the wake-up signal. Therefore, this application significantly improves the accuracy and robustness of the wake-up signal of the main control module 140 through multi-stage processing of integration, comparison, and isolation, effectively avoiding the risk of false or missed wake-ups, thereby ensuring the reliable operation of the vehicle's airbag system.

[0036] In some implementations, see Figure 3 The integrating circuit includes a first resistor R1 and a first capacitor C1. The first end of the first resistor R1 is connected to the signal output terminal AIRBAG_IN, and the second end of the first resistor R1 is connected to the comparator circuit and the first end of the first capacitor C1. The second end of the first capacitor C1 is grounded.

[0037] Specifically, an integrator circuit is used to integrate an input signal, converting the voltage change of the input signal over time into an output voltage change over time. In analog circuits, integrator circuits are typically composed of passive components such as resistors and capacitors, or active components such as operational amplifiers. In this application, the integrator circuit uses a first resistor R1 and a first capacitor C1 to form a classic RC integrator, which is a simple and stable implementation of an integrator circuit.

[0038] In this circuit, the first resistor R1 is a key current-limiting component. Its resistance value, together with the capacitance of the first capacitor C1, determines the time constant of the integrator circuit. This time constant directly affects the integration speed and the slope of the output triangular wave. The first resistor R1 can be a common carbon film resistor, a metal film resistor, or a surface-mount resistor. Its resistance value should be reasonably selected based on the characteristics of the airbag signal and the required triangular wave frequency range to ensure the accuracy of the integration effect.

[0039] The first capacitor C1 is the energy storage element in the integrator circuit, used to store charge and work with the first resistor R1 to complete the integration function. The capacitance value affects the integration time constant and the amplitude of the output triangular wave. The first capacitor C1 can be a ceramic capacitor, an electrolytic capacitor, or a tantalum capacitor. Its capacitance should be selected according to the requirements of integration accuracy, frequency response, and circuit stability to ensure the smoothness and stability of the integrated output.

[0040] In terms of connection, the first terminal of the first resistor R1 is connected to the signal output terminal AIRBAG_IN to receive the airbag signal from the airbag. The second terminal of the first resistor R1 is connected to the input terminal of the comparator circuit and the first terminal of the first capacitor C1, forming an integration circuit. The second terminal of the first capacitor C1 is grounded to provide a stable reference potential for the integration operation. This connection method constitutes a typical RC integrator, which can effectively convert the input airbag signal (e.g., a pulse signal) into an approximate triangular wave signal.

[0041] The above technical solution utilizes a classic RC integrator constructed from a first resistor R1 and a first capacitor C1. This design effectively smooths and integrates the airbag signal, stably converting potentially noisy or transient airbag signals into a triangular wave signal with good linearity. The appropriate selection of the first resistor R1 and the first capacitor C1 ensures that the integration time constant matches the characteristics of the airbag signal, thereby guaranteeing the conversion accuracy and stability of the triangular wave signal. This significantly improves the accuracy of the comparator circuit in judging the airbag signal, avoiding false or missed wake-ups due to signal instability, thus enhancing the reliability and safety of the entire airbag signal wake-up circuit.

[0042] In some implementations, see Figure 4 The comparator circuit includes a comparator chip U2, a first voltage regulator circuit 121, and a second voltage regulator circuit 122. The integrator circuit is connected to the inverting input terminal of the comparator chip U2 through the first voltage regulator circuit 121. The non-inverting input terminal of the comparator chip U2 is connected to a reference voltage source 3V3_PERM through the second voltage regulator circuit 122 to obtain a reference signal. The first output terminal of the comparator chip U2 is connected to the isolation circuit.

[0043] Specifically, the comparator chip U2 is an integrated circuit used to compare two input signals and output a corresponding level signal based on the comparison result. It can be a general-purpose comparator chip, such as LM339 or LM393, or a dedicated comparator chip optimized for a specific application. The core function of the comparator chip U2 is to accurately determine the high-low relationship between its inverting and non-inverting input voltages and output a digital logic level to indicate the instantaneous magnitude relationship between the triangular wave signal and the reference signal.

[0044] The first voltage regulator circuit 121 is used to stabilize the voltage of the triangular wave signal from the integrator circuit. This voltage regulator circuit can be implemented in various ways; for example, it can be a simple Zener diode voltage regulator circuit, or a voltage follower or regulator composed of an operational amplifier and a transistor, to ensure that voltage fluctuations in the triangular wave signal output by the integrator circuit are effectively suppressed before being sent to the inverting input of the comparator chip U2, thereby improving the purity and stability of the signal.

[0045] The second voltage regulator circuit 122 is used to stabilize the reference signal provided by the reference voltage source. Similar to the first voltage regulator circuit 121, the second voltage regulator circuit 122 can also be a voltage regulator circuit composed of a Zener diode, a low-dropout linear regulator (LDO), or an operational amplifier. Its purpose is to ensure that the reference signal received at the non-inverting input of the comparator chip U2 is a highly stable and accurate voltage value, unaffected by power supply voltage fluctuations or other interference, providing a reliable reference for the comparison operation.

[0046] Through the above technical solution, this application can effectively solve the stability problem of the output signal and reference signal of the integrator circuit. The first voltage regulator circuit 121 regulates the triangular wave signal output by the integrator circuit, ensuring that the signal entering the inverting input terminal of the comparator chip U2 has higher stability, thereby suppressing the noise and fluctuations that may exist in the integrator circuit. At the same time, the second voltage regulator circuit 122 regulates the reference signal provided by the reference voltage source, ensuring the accuracy and stability of the reference signal received by the non-inverting input terminal of the comparator chip U2, and avoiding the influence of power supply fluctuations on the reference signal. This dual voltage regulation mechanism ensures that the comparator chip U2 can reliably compare the triangular wave signal and the reference signal in a stable and accurate voltage environment, thereby generating an accurate comparison signal. This accurate comparison signal can more reliably drive the subsequent isolation circuit, thereby outputting a stable second isolation signal, providing a solid foundation for the wake-up of the subsequent main control module 140 and airbag status recognition, and significantly improving the reliability and anti-interference capability of the entire airbag signal wake-up circuit.

[0047] In some implementations, see Figure 4 The isolation circuit includes a first MOSFET MOS1, a second resistor R2, a third resistor R3, and a first diode D1. The gate of the first MOSFET MOS1 is connected to the first output terminal of the comparator chip U2, and its drain is the second signal terminal AIRBAG2uP_DET, connected to the first terminal of the second resistor R2 and the first terminal of the first diode D1. The second terminal of the second resistor R2 is connected to a reference voltage source, and the second terminal of the first diode D1 is connected to the second output terminal of the comparator chip U2 and the first terminal of the third resistor R3. The second terminal of the third resistor R3 is connected to the non-inverting input terminal of the comparator chip U2.

[0048] Specifically, an isolation circuit is a circuit used to provide electrical isolation between two circuits, that is, to block the flow of direct current and low-frequency alternating current, but allow signals or energy to pass through. Its main purpose is to protect sensitive circuits from damage by high voltage or noise, or to prevent ground loop problems. In this application, the isolation circuit is used to isolate the comparison signal output by the comparator circuit and convert it into a second isolation signal. This helps to ensure electrical isolation between the comparator circuit and subsequent circuits (such as power supply module 130 and main control module 140), improving the system's anti-interference capability and safety. In addition to the MOSFET and diode-based scheme used in this application, the isolation circuit can also be implemented by optocouplers, magnetic couplers, or digital isolators.

[0049] The first MOSFET, MOS1, is a voltage-controlled device that controls the conduction or cutoff between the drain and source terminals through the gate voltage. In this application, the first MOSFET, MOS1, serves as the core switching element of the isolation circuit. Its gate receives the output signal from the comparator chip U2, thereby controlling its conduction or cutoff state. The switching action of the first MOSFET, MOS1, converts the level signal of the comparator chip U2 into an isolated second isolation signal, which drives subsequent circuitry. An enhancement-mode or depletion-mode MOSFET, an N-channel or P-channel type, can be selected, depending on the output level of the comparator chip U2, the required drive current and voltage, and the system's switching speed requirements.

[0050] The second resistor R2 is an electronic component that limits current flow. In this application, the second resistor R2 is connected to the drain of the first MOSFET MOS1 and the first terminal of the first diode D1, and its other terminal is connected to a reference voltage source. It acts as a pull-up resistor or a current-limiting resistor, used to pull the second signal terminal AIRBAG2uP_DET high to the reference voltage when the first MOSFET MOS1 is off, or to limit the current when the first MOSFET MOS1 is on, thereby ensuring the level stability and reliability of the second isolation signal. Appropriate resistance values ​​and power ratings can be selected based on the required current, voltage, and power consumption.

[0051] The third resistor R3 is also an electronic component that limits current flow. In this application, the third resistor R3 is connected between the second terminal of the first diode D1 and the non-inverting input terminal of the comparator chip U2. It may be used to provide feedback, voltage division, or current limiting to affect the operating point or signal transmission characteristics of the comparator chip U2. Similarly, the appropriate resistance value and power rating are selected according to the circuit design requirements.

[0052] The first diode D1 is a semiconductor device with unidirectional conductivity, allowing current to flow in one direction while blocking it in the other. In this application, the first diode D1 is connected to the drain of the first MOSFET MOS1 and the first terminal of the second resistor R2, and its second terminal is connected to the second output terminal of the comparator chip U2 and the first terminal of the third resistor R3. It is used for rectification, clamping, level shifting, or providing reverse protection to ensure the correct transmission direction and level of the signal. A common PN junction diode, a Schottky diode D2, or a Zener diode can be selected, depending on their specific functional requirements in the circuit.

[0053] By employing an isolation circuit consisting of a first MOSFET MOS1, a second resistor R2, a third resistor R3, and a first diode D1, this application can effectively isolate and level-shift the comparison signal output from the first output terminal of the comparator chip U2. Specifically, when the first output terminal of the comparator chip U2 outputs a high or low level according to the comparison result, this signal directly drives the gate of the first MOSFET MOS1. The first MOSFET MOS1, as the core switching element, is precisely controlled in its on / off state, thereby causing a corresponding change in the level state of its drain (i.e., the second signal terminal AIRBAG2uP_DET). The second resistor R2 is connected to a reference voltage source, and when the first MOSFET MOS1 is off, it can reliably pull the second signal terminal AIRBAG2uP_DET high to the reference voltage. Furthermore, the cooperation of the first diode D1 with the second output terminal of the comparator chip U2 and the third resistor R3 further ensures unidirectional signal transmission and level stability, effectively preventing reverse current or unwanted voltage fluctuations. This isolation method not only establishes a reliable electrical isolation barrier between the comparison circuit and the subsequent power supply module 130 and the main control module 140, significantly improving the anti-interference capability and operational stability of the entire airbag signal wake-up circuit, but also ensures that a stable and accurate second isolation signal can be reliably generated when the airbag signal appears, thereby waking up the main control module 140 in a timely and effective manner, ensuring the rapid response and reliable operation of the vehicle safety system.

[0054] In some implementations, see Figure 2 The power supply module 130 includes a power chip U1, and a power supply terminal U1_Vout is set on the power chip U1. The power chip U1 is also provided with a second power input terminal U1_Vin and an enable control terminal U1_EN. The second power input terminal U1_Vin is connected to an external power source to draw power, and the enable control terminal U1_EN is connected to the second signal terminal AIRBAG2uP_DET and the vehicle power source through an OR gate U3.

[0055] The power chip U1 is an integrated circuit specifically designed for managing and regulating power. Its core function is to convert raw input electrical energy into stable output electrical energy that meets specific voltage requirements. The power supply terminal U1_Vout is directly located on the power chip U1, indicating that this chip is a core component of the power supply module 130, responsible for the actual power output, thus ensuring the stability and reliability of the power supply. The second power input terminal U1_Vin of the power chip U1 is used to receive raw electrical energy from an external power source such as BATT_12V, such as a vehicle battery or main power system. The enable control terminal U1_EN is a key control pin of the power chip U1, controlling its operating state, i.e., determining whether it is turned on and outputs power. When the enable control terminal U1_EN receives a valid enable signal, the power chip U1 starts working; otherwise, it stops working or enters a low-power mode. The OR gate U3, as a logic circuit, has the characteristic that as long as either input terminal receives a valid signal, its output terminal is also a valid signal. In this scheme, OR gate U3 takes the second signal terminal AIRBAG2uP_DET (i.e., the second isolation signal) from the comparison output module 120 and the vehicle power terminal, which indicates the overall power supply status of the vehicle, as inputs. With this connection, as long as either the second isolation signal or the vehicle power terminal is valid, OR gate U3 will output a valid enable signal to the enable control terminal U1_EN of the power chip U1. In this embodiment, the external power supply can be a 12V input power supply.

[0056] Through the above technical solution, the power supply module 130 can achieve intelligent power supply management for the main control module 140. When the airbag signal triggers the second isolation signal, even if the vehicle's main power supply is not fully activated, the second signal terminal AIRBAG2uP_DET can enable the power chip U1 through the OR gate U3, thereby quickly providing power to the main control module 140 and ensuring the timely wake-up of the main control module 140. Simultaneously, when the vehicle is in normal operation and the vehicle power terminal signal is valid, the power chip U1 can also continuously supply power, ensuring the normal operation of the main control module 140. This design avoids continuous power supply to the main control module 140 during unnecessary periods, effectively reducing the overall energy consumption of the system. Furthermore, the introduction of the power chip U1 ensures the stability and reliability of the power supply, providing a solid guarantee for the stable operation of the main control module 140.

[0057] In some implementations, see Figure 5 The isolated output module 110 includes a Schottky diode D2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first transistor Q1, a second transistor Q2, a second capacitor C2, and a third capacitor C3.

[0058] The signal output terminal of the airbag is connected through a Schottky diode, the first terminal of the fourth resistor and the fifth resistor, the first terminal of the sixth resistor, and the first terminal of the second capacitor. The second end of the sixth resistor is connected to the base of the first transistor, the emitter of the first transistor is connected to the second end of the fifth resistor and the external power supply, and the collector is connected to the base of the second transistor through the seventh resistor. The collector of the second transistor is connected to the first end of the eighth resistor and the first end of the ninth resistor, and the emitter is grounded. The second end of the eighth resistor is connected to the reference voltage source, and the second end of the ninth resistor is the first signal terminal and is connected to the first terminal of the third capacitor; the second terminals of the second capacitor and the second terminals of the third capacitor are connected to the power supply ground.

[0059] Specifically, Schottky diode D2, characterized by low forward voltage drop and short reverse recovery time, is configured here to provide unidirectional conduction of the airbag signal or overvoltage protection, preventing reverse voltage from impacting subsequent circuits and thus enhancing circuit robustness. Resistors R4, R5, R6, R7, R8, and R9 work together in the circuit to divide the airbag signal, limit current, or provide bias voltage. For example, they can form a resistor divider network to adjust the airbag signal voltage level to a level suitable for the transistor's operating range, or act as current-limiting resistors to protect the transistor. Simultaneously, these resistors, in conjunction with capacitors, can form an RC filter network to effectively suppress potential noise and interference in the airbag signal. Transistors Q1 and Q2, as core signal processing components, are typically configured as amplifiers or switching circuits. Transistor Q1 receives the pre-processed airbag signal, amplifies or levels it, and then drives transistor Q2 through resistor R6. The second transistor Q2 further processes the signal, such as amplifying, inverting, or shaping it, ultimately outputting a stable first isolation signal. This two-stage transistor structure provides sufficient gain and drive capability, ensuring that the signal remains undistorted during isolation and exhibits good anti-interference performance. The second capacitor C2 and the third capacitor C3 are mainly used for filtering and bypassing. The second capacitor C2, in conjunction with the fourth resistor R4 and the fifth resistor R5, filters out high-frequency noise at the signal input, smoothing the signal. The third capacitor C3 is connected between the second terminal of the ninth resistor R9 (i.e., the first signal terminal SRS_INT) and the power supply ground, further filtering the output first isolation signal to eliminate residual ripple and transient interference, ensuring the purity and stability of the output signal. In this embodiment, the external power supply can be an 8V power supply, and the reference voltage source can be a 3.3V voltage source.

[0060] Through the above technical solution, the isolation output module 110 utilizes Schottky diode D2 for signal protection and preliminary processing, and performs precise level adjustment and biasing of the signal through a multi-stage resistor network. The two-stage amplification or switching circuit composed of the first transistor Q1 and the second transistor Q2 can effectively amplify, shape, and level-convert the airbag signal, significantly enhancing the signal's driving capability and anti-interference capability. Simultaneously, the second capacitor C2 and the third capacitor C3 work synergistically with the resistor network to form a highly efficient RC filter circuit, effectively filtering out noise, glitches, and transient interference that may exist in the airbag signal, ensuring that the output first isolation signal has high stability, high purity, and high reliability. This enables the main control module 140 to accurately identify the current state of the airbag based on the high-quality first isolation signal, avoiding misjudgments or missed judgments caused by signal quality issues, thereby greatly improving the reliability and safety of the entire airbag signal wake-up circuit.

[0061] In a specific example, the airbag outputs a PWM wave after it is activated. Different duty cycles or frequencies represent different states, such as: the airbag is working normally but has not deployed, or the airbag has deployed. The integrator circuit converts the airbag PWM into a triangular wave with a small peak-to-peak value. The integrator circuit is adjusted according to different duty cycles to integrate different triangular waves. Taking an 8V PWM signal as an example, the airbag PWM signal has a 50% duty cycle, a frequency of 16.66Hz, a high level of 8V, and a low level of 0V. After passing through the integrator circuit, the PWM signal becomes a triangular wave: a frequency of 16.66Hz, a high level of 4.55V, and a low level of 3.45V. When the airbag is not deployed, there is no PWM wave output; at this time, the level should be 0V or 8V, the integrator circuit will not be effective, and the input to the comparator should also be 0V or 8V.

[0062] The comparator circuit sets the effective comparison voltage of the comparator according to the actual airbag signal; the effective voltage of the comparator is set to between 1V and 7V; if the comparator input voltage is >7V or <1V, it is considered that the airbag is not working properly and the comparator outputs a low level; if the comparator input voltage is between 1V and 7V, it is considered that the airbag is working properly and the comparator outputs a high level.

[0063] Example 2: Figure 6 An embodiment of an airbag signal wake-up method of the present invention is shown. Based on embodiment 1, the method includes: 610, Obtain the airbag signal; 620, based on the airbag signal, perform isolation output to generate a first isolation signal; 630, the airbag signal is integrated and converted to generate a triangular wave signal, and the triangular wave signal is compared with a preset reference signal to generate a second isolation signal based on the comparison result; 640. The vehicle's main control module is woken up according to the second isolation signal, and the current status of the airbag is determined according to the first isolation signal.

[0064] In steps 610-640, during the step of acquiring the airbag signal, the airbag's signal output terminal will generate an electrical signal representing its operational status or triggering event. This signal can be an analog or digital quantity, which is directly input to the isolation output module and the comparison output module as raw data for subsequent processing.

[0065] In the step of generating a first isolation signal based on the airbag signal, the isolation output module receives the airbag signal and then electrically isolates and conditions it. For example, the isolation output module can use an optocoupler, a magnetic coupler, or a circuit composed of components such as Schottky diodes, fourth resistors, fifth resistors, sixth resistors, seventh resistors, eighth resistors, ninth resistors, tenth resistors, first transistors, second transistors, second capacitors, and third capacitors as described above. This ensures electrical isolation between the main control module and the airbag signal source, preventing damage to the main control module from high voltage or noise. Simultaneously, the module also performs necessary filtering, amplification, or level conversion on the signal to generate a first isolation signal suitable for the input of the main control module. This first isolation signal typically contains detailed information about the airbag signal for subsequent accurate status determination.

[0066] In the steps of integrating and converting the airbag signal to generate a triangular wave signal, comparing the triangular wave signal with a preset reference signal, and generating a second isolation signal based on the comparison result, the comparison output module first integrates the airbag signal through an integrating circuit. The integrating circuit, for example, consists of a first resistor and a first capacitor, which converts the transient airbag signal into a smooth triangular wave signal with a certain slope. This integration helps filter out high-frequency noise and transient interference in the signal, making the energy or duration characteristics of the signal more apparent. Subsequently, the comparison circuit compares the generated triangular wave signal with a preset reference signal in real time. This reference signal is typically a stable voltage threshold used to determine whether the airbag signal meets the conditions for triggering wake-up. When the comparison result between the triangular wave signal and the reference signal meets a specific condition (e.g., the triangular wave signal exceeds the reference signal threshold), the comparison circuit outputs a comparison signal. This comparison signal is then isolated and conditioned by an isolation circuit to generate a second isolation signal. The second isolation signal is typically a simple digital level signal whose main function is to indicate whether the main control module needs to be woken up.

[0067] In the steps of waking up the vehicle's main control module based on the second isolation signal and determining the current state of the airbag based on the first isolation signal, the second isolation signal is sent to the enable control terminal of the power supply module and the second input terminal of the main control module. When the second isolation signal indicates that wake-up is required, the power chip in the power supply module is enabled, thereby providing a stable power supply to the main control module, enabling the main control module to switch from low-power mode to normal operating mode. After being woken up, the main control module receives the first isolation signal from the isolation output module through its first input terminal. The main control module further analyzes and processes the first isolation signal, for example, by using specific algorithms or logical judgments to accurately identify the current state of the airbag, including but not limited to whether it is in normal operation, fault, warning, or triggered state.

[0068] Through the above technical solution, this application provides an efficient and reliable airbag signal wake-up method. This method divides the airbag signal processing into two parallel and functionally independent paths: one path generates a second isolation signal for quickly waking up the main control module, and the other path generates a first isolation signal for accurately determining the airbag status. This dual-path processing mechanism, particularly by generating the wake-up signal through integral conversion of the airbag signal and comparison with a reference signal, significantly enhances the anti-interference capability and reliability of the wake-up mechanism, effectively avoiding false wake-ups caused by transient noise or mis-triggered events, thereby reducing unnecessary system energy consumption. Simultaneously, after the main control module is woken up, the accurate determination of the airbag status using the first isolation signal, which contains more detailed information, ensures accurate monitoring of the airbag's operational status, improving the overall vehicle safety and diagnostic capabilities. This method optimizes the main control module's energy management, ensuring it is only woken up when necessary, extending the system's operational lifespan, and improving the system's response efficiency and accuracy to airbag events.

[0069] Example 3: Based on Embodiment 1 or Embodiment 2, the present invention provides a vehicle for executing the aforementioned airbag signal activation method. Specifically, the vehicle refers to a motorized device for transportation, typically driven by an engine or electric motor, which integrates various electronic control units, sensors, actuators, and power systems. In this vehicle, the aforementioned airbag signal activation circuit is embedded in the vehicle's overall electronic architecture, particularly in the safety system domain. This integration involves physical installation, electrical connections to the vehicle's power system and communication bus, and software integration with the vehicle's main control module. The vehicle, as a platform, provides the necessary operating environment and system support for activating the main control module and recognizing the airbag status.

[0070] By integrating the aforementioned airbag signal wake-up circuit and method into the vehicle, the complete deployment of this wake-up technology in real-world application scenarios is achieved. The vehicle can accurately wake up the main control module based on the airbag signal, and after the main control module is woken up, it accurately determines the current state of the airbag based on the first isolation signal, thereby promptly activating corresponding safety protection measures. This integration not only ensures the reliability and response speed of the airbag system during vehicle operation, but also effectively reduces the vehicle's energy consumption in non-collision states by waking up the main control module on demand, thus improving the overall energy efficiency and safety of the vehicle.

[0071] The algorithms or displays provided herein are not inherently related to any particular computer, virtual system, or other device. Furthermore, the embodiments of this invention are not directed to any particular programming language.

[0072] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. Similarly, for the sake of brevity and to aid in understanding one or more aspects of the invention, in the description of exemplary embodiments of the invention above, various features of the embodiments are sometimes grouped together in a single embodiment, figure, or description thereof. The claims, which follow the detailed description, are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of the invention.

[0073] Those skilled in the art will understand that the modules in the device of the embodiment can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiment can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components, except that at least some of such features and / or processes or units are mutually exclusive.

[0074] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be construed as limiting the order of execution.

Claims

1. An airbag signal wake-up circuit, comprising: The application relates to an airbag signal output module. The airbag signal output module comprises an isolation output module, a comparison output module and a power supply module. The isolation output module is connected with a signal output end of an airbag to obtain an airbag signal, and is provided with a first signal end which outputs a first isolation signal according to the airbag signal. The comparison output module is connected with the signal output end of the airbag to obtain the airbag signal, and is provided with a second signal end which outputs a second isolation signal according to the airbag signal. The power supply module is connected with the second signal end, and is provided with a power supply end which outputs a power supply according to the second isolation signal or a signal of a vehicle power supply end.

2. The airbag signal wake-up circuit of claim 1, wherein, The main control module is connected with the first signal end, the second signal end and the power supply end, and recognizes the airbag signal according to the first isolation signal and carries out main control module wake-up through the second isolation signal.

3. The airbag signal wake-up circuit of claim 1, wherein, The main control module is provided with a first input end, a second input end and a first power supply end. The first input end is connected with the first signal end, the second input end is connected with the second signal end, and the first power supply end is connected with the power supply end. The comparison output module comprises an integration circuit, a comparison circuit and an isolation circuit. The integration circuit is connected with the signal output end, converts the airbag signal into a triangular wave signal and outputs the triangular wave signal.

4. The airbag signal wake-up circuit of claim 3, wherein, The comparison circuit is connected with the integration circuit, compares the triangular wave signal with a reference signal and outputs a comparison signal.

5. The airbag signal wake-up circuit of claim 4, wherein, The isolation circuit is connected with an output end of the comparison circuit, and isolates and outputs the second isolation signal according to the comparison signal.

6. The airbag signal wake-up circuit of claim 5, wherein, The integration circuit comprises a first resistor and a first capacitor. The first end of the first resistor is connected with the signal output end, the second end of the first resistor is connected with the comparison circuit and the first end of the first capacitor, and the second end of the first capacitor is grounded.

7. The airbag signal wake-up circuit of claim 6, wherein The comparison circuit comprises a comparison chip, a first voltage stabilizing circuit and a second voltage stabilizing circuit. The integration circuit is connected with the inverting input end of the comparison chip through the first voltage stabilizing circuit. The non-inverting input end of the comparison chip is connected with a reference voltage source through the second voltage stabilizing circuit to obtain a reference signal. The first output end of the comparison chip is connected with the isolation circuit. The isolation circuit comprises a first MOS transistor, a second resistor, a third resistor and a first diode. The gate of the first MOS transistor is connected with the first output end of the comparison chip. The drain of the first MOS transistor is the second signal end and is connected with the first end of the second resistor and the first end of the first diode. The second end of the second resistor is connected with the reference voltage source. The second end of the first diode is connected with the second output end of the comparison chip and the first end of the third resistor. The third end of the third resistor is connected with the non-inverting input end of the comparison chip. The power supply module comprises a power supply chip. The power supply end is arranged on the power supply chip. The power supply chip is further provided with a second power supply input end and an enable control end. The second power supply input end is connected with an external power supply to obtain power. The enable control end is connected with the second signal end and the vehicle power supply end through an OR gate.

8. The airbag signal wake-up circuit of claim 2, wherein, The isolation output module comprises a Schottky diode, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first triode, a second triode, a second capacitor and a third capacitor; The signal output end of the airbag is connected with the Schottky diode, the first end of the fourth resistor and the fifth resistor, the first end of the sixth resistor and the first end of the second capacitor; The second end of the sixth resistor is connected with the base of the first triode, the emitter of the first triode is connected with the second end of the fifth resistor and an external power supply, and the collector of the first triode is connected with the base of the second triode through the seventh resistor; The collector of the second triode is connected with the first end of the eighth resistor and the first end of the ninth resistor, and the emitter of the second triode is grounded; The second end of the eighth resistor is connected with a reference voltage source, the second end of the ninth resistor is a first signal end and is connected with the first end of the third capacitor, and the second end of the second capacitor and the second end of the third capacitor are connected with a power supply ground.

9. An airbag signal wake-up method, characterized by, The airbag signal awakening circuit based on any one of claims 1-8, the method comprising: acquiring an airbag signal of an airbag; performing isolation output according to the airbag signal to generate a first isolation signal; performing integral conversion on the airbag signal to generate a triangular wave signal, comparing the triangular wave signal with a preset reference signal, and generating a second isolation signal according to a comparison result; awakening a main control module of a vehicle according to the second isolation signal, and determining a current state of the airbag according to the first isolation signal.

10. A vehicle characterized by comprising: The vehicle is used to perform the airbag signal awakening method of claim 9.

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