Collision detection circuit and vehicle

Abstract

The utility model provides a collision detection circuit and a vehicle, and belongs to the technical field of vehicle safety, the collision detection circuit comprises a signal acquisition module, an amplitude detection module, a duration detection module, a logic level inverter module and an output module; the signal acquisition module is used for acquiring a pulse signal and converting the pulse signal into a voltage signal, and the amplitude detection module is used for detecting the amplitude of the voltage signal to obtain an amplitude signal; the duration detection module is used for detecting the duration of the amplitude signal, and the logic level inverter module is used for performing level conversion on the amplitude signal; the signal acquisition module is used for acquiring pulse current signals of 0.5-0.63 ms, the output module is used for sending out high-voltage cut-off signals when the amplitude signals and the duration meet conditions, the signal acquisition module can acquire pulse current signals of 0.5-0.63 ms, whether collision occurs or not can be determined through duration detection and amplitude detection within 20 ms, the high-voltage cut-off signals can be output in time through the output module, and the collision can be avoided. And the safety is better ensured by the quickness of the response.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle safety, in particular to a collision detection circuit and a vehicle. Background Art

[0002] The high-voltage battery is the main driving force source of an electric vehicle, and the safety of the high-voltage battery is an important part of the safety of the electric vehicle. When an electric vehicle collides, it may cause an unexpected external high-voltage short circuit between drive systems or some uncontrollable emergency events of the vehicle, which may cause secondary injuries to the vehicle or the driver. Therefore, collision detection and emergency handling are crucial. At present, most collision detections are that the battery management system captures the PWM wave signal sent by the restraint control module (RCM), and this method is mature and reliable.

[0003] However, during a collision, it is necessary to go through the frequency change or duty cycle change of the PWM waveform, and it takes at least 2-3 cycles to stably determine the occurrence of a collision, resulting in the collision determination time being extended to the second level. Summary of the Utility Model

[0004] The utility model provides a collision detection circuit and a vehicle to solve the defect of long collision detection time in the prior art.

[0005] In a first aspect, the utility model provides a collision detection circuit, including: a signal acquisition module, an amplitude detection module, a duration detection module, a logic level inverter module, and an output module;

[0006] The signal acquisition module is connected to a pulse signal input terminal, the signal acquisition module is further connected to the amplitude detection module, the amplitude detection module is respectively connected to the duration detection module and the logic level inverter module, and both the duration detection module and the logic level inverter module are connected to the output module;

[0007] The signal acquisition module is used to acquire a pulse signal and convert it into a voltage signal, and the amplitude detection module is used to detect the amplitude of the voltage signal to obtain an amplitude signal;

[0008] The duration detection module is used to detect the duration of the amplitude signal, and the logic level inverter module is used to perform level conversion on the amplitude signal;

[0009] The output module is used to send out a high-voltage cut-off signal when the amplitude signal and the duration meet the conditions.

[0010] According to a collision detection circuit provided by the utility model, the signal acquisition module includes: a filtering unit, a sampling unit, and an amplifying unit;

[0011] One end of the filtering unit is connected to the pulse signal input end, and the other end is connected to the sampling unit. The sampling unit is also connected to the amplifying unit, and the amplifying unit is also connected to the amplitude detection module;

[0012] The filtering unit is used to filter the pulse signal and convert it into a voltage signal;

[0013] The sampling unit is used to sample the voltage signal to obtain a sampled voltage;

[0014] The amplifying unit is used to amplify the sampled voltage.

[0015] According to a collision detection circuit provided by the present invention, the amplifying unit includes: an operational amplifier, a first resistor, a second resistor, and a third resistor;

[0016] The input ends of the operational amplifier are respectively connected to the sampling unit through the first resistor and the second resistor, and the output end of the operational amplifier is connected to the amplitude detection unit;

[0017] One end of the third resistor is connected to the negative input end of the operational amplifier, and the other end is connected to the output end of the operational amplifier.

[0018] According to a collision detection circuit provided by the present invention, the amplitude detection module includes: a threshold voltage unit and a comparison unit;

[0019] The threshold voltage unit and the voltage signal are both connected to the input end of the comparison unit, and the output end of the comparison unit is connected to the duration detection module;

[0020] The threshold voltage unit is used to set a threshold voltage, and the comparison unit is used to compare the threshold voltage and the output voltage of the signal acquisition module.

[0021] According to a collision detection circuit provided by the present invention, the threshold voltage unit includes: a sixth resistor, a seventh resistor, and a third capacitor;

[0022] One end of the sixth resistor is connected to the controller, the other end is grounded through the seventh resistor, the third capacitor is connected in parallel with the seventh resistor, and the third capacitor is also connected to the input end of the comparison unit.

[0023] According to a collision detection circuit provided by the present invention, the duration detection module includes: an eighth resistor, a ninth resistor, a tenth resistor, a first diode, a second diode, a first triode, and a fourth capacitor;

[0024] The base of the first triode is connected to the amplitude detection module through the eighth resistor, and the base of the first triode is also connected to the power supply terminal after being connected in series with the first diode and the second diode;

[0025] The emitter of the first triode is connected to the power supply terminal through the ninth resistor, and the collector of the first triode is connected to the output module;

[0026] The fourth capacitor is connected in parallel with the tenth resistor, and one end is connected to the collector of the first triode, and the other end is grounded.

[0027] According to a collision detection circuit provided by the present invention, the logic level inverter module includes: a second triode, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor;

[0028] The base of the second triode is connected to the amplitude detection module through the thirteenth resistor, and the base of the second triode is also connected to the power supply terminal through the twelfth resistor;

[0029] The emitter of the second triode is connected to the power supply terminal through the eleventh resistor;

[0030] The collector of the second triode is grounded through the fourteenth resistor, and the collector of the second triode is also connected to the output module.

[0031] According to a collision detection circuit provided by the present invention, the output module includes: an AND gate, a third triode, a fourth triode, a third diode, a fifteenth resistor, a sixteenth resistor, and a seventeenth resistor;

[0032] The input terminals of the AND gate are respectively connected to the duration detection module and the logic level inverter module, and the output terminal of the AND gate is connected to the base of the fourth triode through the seventeenth resistor;

[0033] The base of the fourth triode is also connected to the collector of the third triode through the sixteenth resistor, the emitter of the fourth triode is grounded, and the collector of the fourth triode is connected to the base of the third triode;

[0034] The base of the third triode is connected to the power supply terminal through the fifteenth resistor, the emitter of the third triode is connected to the power supply terminal, and the base of the third triode is also connected to the control terminal of the high-voltage relay through the third diode.

[0035] According to a collision detection circuit provided by the present invention, the high-voltage cut-off signal is a low-level signal.

[0036] In a second aspect, the present utility model also protects a vehicle, which includes the collision detection circuit as described in any one of the above.

[0037] The collision detection circuit and vehicle provided by the present utility model include: a signal acquisition module, an amplitude detection module, a duration detection module, a logic level inverter module, and an output module; the signal acquisition module is connected to the pulse signal input terminal, the signal acquisition module is also connected to the amplitude detection module, the amplitude detection module is also respectively connected to the duration detection module and the logic level inverter module, and both the duration detection module and the logic level inverter module are connected to the output module; the signal acquisition module is used to acquire the pulse signal and convert it into a voltage signal, the amplitude detection module is used to detect the amplitude of the voltage signal to obtain an amplitude signal; the duration detection module is used to detect the duration of the amplitude signal, and the logic level inverter module is used to perform level conversion on the amplitude signal; the output module is used to send out a high-voltage cut-off signal when the amplitude signal and the duration meet the conditions. Since the signal acquisition module can acquire a 0.5 - 0.63 ms pulse current signal, it can determine whether a collision has occurred through duration detection and amplitude detection within 20 ms, and can promptly output a high-voltage cut-off signal through the output module, and the rapidity of the response better ensures safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0039] Figure 1 is a schematic structural diagram of the collision detection circuit provided in this embodiment;

[0040] Figure 2 is a schematic diagram of the power-down process of the collision detection provided in this embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] In order to make the objectives, technical solutions, and advantages of the present utility model clearer, the following will clearly and completely describe the technical solutions in the present utility model in conjunction with the drawings in the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

[0042] Figure 1 is a schematic structural diagram of the collision detection circuit provided in this embodiment.

[0043] As shown Figure 1 in the figure, a collision detection circuit provided in this embodiment includes: a signal acquisition module 1, an amplitude detection module 2, a duration detection module 3, a logic level inverter module 4, and an output module 5; the signal acquisition module 1 is connected to a pulse signal input terminal, the signal acquisition module 1 is further connected to the amplitude detection module 2, the amplitude detection module 2 is further connected to the duration detection module 3 and the logic level inverter module 4 respectively, and the duration detection module 3 and the logic level inverter module 4 are both connected to the output module 5; the signal acquisition module 1 is used to acquire a pulse signal and convert it into a voltage signal, the amplitude detection module 2 is used to detect the amplitude of the voltage signal to obtain an amplitude signal; the duration detection module 3 is used to detect the duration of the amplitude signal, and the logic level inverter module 4 is used to perform level conversion on the amplitude signal; the output module 5 is used to send out a high-voltage cut-off signal when the amplitude signal and the duration meet the conditions. Among them, the high-voltage cut-off signal is a low-level signal, so that the high-voltage cut-off signal does not affect other external signals.

[0044] In a specific implementation process, when a car collides, the hard-wired signal sent by the airbag, that is, a 0.5 - 0.63 ms pulse current signal, the pulse current is about 1.75 A, and the duration is 0.5 ms. At this time, the signal acquisition module 1 will acquire the pulse signal. The signal acquisition module 1 filters and converts the pulse signal to obtain a voltage signal, and then amplifies and transmits it to the sampling module of the main board to achieve signal conversion and acquisition. After completing signal acquisition, the signal is input to the amplitude detection module 2. The main purpose of the amplitude detection module 2 is to detect the amplitude of the voltage amplified at two points of the sampling resistor R4. When the amplitude exceeds the preset threshold, the amplitude detection module 2 outputs a low-level signal.

[0045] The low-level signal is simultaneously input to the duration detection module 3 and the logic level inverter module 4. The duration detection module 3 is turned on under the action of the low-level signal, so as to detect the duration of the input signal. At the same time, the logic level inverter module 4 converts the low level into a high-level signal, so that the output signals of the duration detection module 3 and the logic level inverter module 4 are simultaneously input to the output module 5, enabling the input module to work. When both input signals reach a high level, it proves that the voltage amplitude and duration of the input signal both meet the detection requirements. At this time, the output module 5 outputs a high level, and then the output module 5 can finally ensure that the output signal ACTIVE-LOW is a low level through conversion, so that the 12V high voltage does not affect external signals. The output signal ACTIVE-LOW can adjust the high-voltage relay control signal to make it invalid, so as to cut off the high-voltage output and complete the power-down operation after detecting a collision event, thereby completing the entire collision detection and power-down.

[0046] From detecting a collision to successful power - off, the duration of the whole process is within 20 ms, which can effectively avoid the safety risks caused by the impact of large current on the battery due to short - circuit outside the battery, or the secondary damage caused by the impact on the battery pack.

[0047] Further, on the basis of the above - mentioned embodiment, as Figure 1 shown, the signal acquisition module 1 in this embodiment includes: a filtering unit, a sampling unit, and an amplifying unit; one end of the filtering unit is connected to the pulse signal input terminal, the other end is connected to the sampling unit, the sampling unit is also connected to the amplifying unit, and the amplifying unit is also connected to the amplitude detection module 2; the filtering unit is used to filter the pulse signal and convert it into a voltage signal; the sampling unit is used to sample the voltage signal to obtain a sampled voltage; the amplifying unit is used to amplify the sampled voltage. Among them, the amplifying unit includes: an operational amplifier U1, a first resistor R1, a second resistor R2, and a third resistor R3; the input terminals of the operational amplifier U1 are respectively connected to the sampling unit through the first resistor R1 and the second resistor R2, and the output terminal of the operational amplifier U1 is connected to the amplitude detection unit; one end of the third resistor R3 is connected to the negative input terminal of the operational amplifier U1, and the other end is connected to the output terminal of the operational amplifier U1.

[0048] Specifically, the sampling unit is the sampling resistor R4, and the battery management system can collect the voltage across the sampling resistor R4, that is, the differential input voltage of the operational amplifier. The filtering unit includes a common - mode inductor L1, a first capacitor C1, and a second capacitor C2. The input terminal of the common - mode inductor L1 is connected to the pulse signal of the airbag, the output terminal of the common - mode inductor L1 is respectively connected to the first capacitor C1 and the second capacitor C2, and both the first capacitor C1 and the second capacitor C2 are grounded. Therefore, the three form a filtering circuit to ensure that the current signal flowing through the sampling resistor R4 is not interfered with and changed.

[0049] Among them, the first resistor R1 in the amplifying unit is mainly used to balance the input impedance to avoid fluctuations in sampling. The functions of the second resistor R2 and the third resistor R3 are to adjust the amplification factor of the differential input voltage, and the operational amplifier U1 mainly cooperates with the second resistor R2 and the third resistor R3 to amplify the collected voltage signal.

[0050] Further, on the basis of the above - mentioned embodiment, as Figure 1 shown, the amplitude detection module 2 in this embodiment includes: a threshold voltage unit and a comparison unit; the threshold voltage unit and the voltage signal are both connected to the input terminal of the comparison unit, and the output terminal of the comparison unit is connected to the duration detection module 3; the threshold voltage unit is used to set the threshold voltage, and the comparison unit is used to compare the threshold voltage with the output voltage of the signal acquisition module 1.

[0051] Specifically, the amplitude detection module 2 includes a fifth resistor R5, a threshold voltage unit, and a comparison unit. One end of the fifth resistor R5 is connected to the output terminal of the operational amplifier U1, and the other end is connected to the input terminal of the comparator U2. The threshold voltage unit includes: a sixth resistor R6, a seventh resistor R7, and a third capacitor C3; one end of the sixth resistor R6 is connected to the controller, the other end is grounded through the seventh resistor R7, the third capacitor C3 is connected in parallel with the seventh resistor R7, and the third capacitor C3 is also connected to the input terminal of the comparison unit, and the comparison unit is the comparator U2.

[0052] The main function of the fifth resistor R5 is to balance the input impedance and stabilize the sampling signal. The threshold signal Vrefx of the threshold voltage unit is set by voltage division of the sixth resistor R6 and the seventh resistor R7, thereby triggering the threshold voltage. The function of the third capacitor C3 is to stabilize the input threshold. And the input current and resistance should satisfy the following formula (1):

[0053] Iin-min*2*(1+R3 / R2)=Vrefx / (R6+R7)*R7 (1)

[0054] Wherein, R2 represents the resistance value of the second resistor R2, R3 represents the resistance value of the third resistor R3, R6 represents the resistance value of the sixth resistor R6, R7 represents the resistance value of the seventh resistor R7, and Iin-min represents the pulse input current.

[0055] When the voltage input signal of the comparator U2 exceeds the threshold voltage triggered and recorded by the controller, a low level is output, so that the magnitude of the amplitude signal can be effectively detected through comparison.

[0056] Further, on the basis of the above embodiment, as Figure 1 shown, the duration detection module 3 in this embodiment includes: an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a first diode D1, a second diode D2, a first triode Q1, and a fourth capacitor C4; the base of the first triode Q1 is connected to the amplitude detection module 2 through the eighth resistor R8, and the base of the first triode Q1 is also connected in series with the first diode D1 and the second diode D2 and then connected to the power supply terminal; the emitter of the first triode Q1 is connected to the power supply terminal through the ninth resistor R9, the collector of the first triode Q1 is connected to the output module 5; the fourth capacitor C4 is connected in parallel with the tenth resistor R10 and one end is connected to the collector of the first triode Q1, and the other end is grounded.

[0057] Specifically, the first diode D1, the second diode D2, the ninth resistor R9, and the first triode Q1 form a constant current source circuit, so as to charge the fourth capacitor C4 with a constant current. By adjusting the ninth resistor R9 and the fourth capacitor C4, the voltage on the fourth capacitor C4 can reach the high-level voltage recognized by the output module 5 within the duration of the input signal, achieving the purpose of detecting the duration of the input signal. When the duration reaches the preset time, a high-level signal is output.

[0058] As Figure 1 shown, the logic level inverter module 4 includes: a second triode Q2, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, and a fourteenth resistor R14; the base of the second triode Q2 is connected to the amplitude detection module 2 through the thirteenth resistor R13, and the base of the second triode Q2 is also connected to the power supply terminal through the twelfth resistor R12; the emitter of the second triode Q2 is connected to the power supply terminal through the eleventh resistor R11; the collector of the second triode Q2 is grounded through the fourteenth resistor R14, and the collector of the second triode Q2 is also connected to the output module 5. Thus, through operations such as inverse operation, the recognition signal output by the comparator U2 is converted into a high-level signal recognized by the output module 5.

[0059] Further, as Figure 1 shown, the output module 5 includes: an AND gate U3, a third triode Q3, a fourth triode Q4, a third diode D3, a fifteenth resistor R15, a sixteenth resistor R16, and a seventeenth resistor R17; the input terminals of the AND gate U3 are respectively connected to the duration detection module 3 and the logic level inverter module 4, and the output terminal of the AND gate U3 is connected to the base of the fourth triode Q4 through the seventeenth resistor R17; the base of the fourth triode Q4 is also connected to the collector of the third triode Q3 through the sixteenth resistor R16, the emitter of the fourth triode Q4 is grounded, and the collector of the fourth triode Q4 is connected to the base of the third triode Q3; the base of the third triode Q3 is connected to the power supply terminal through the fifteenth resistor R15, the emitter of the third triode Q3 is connected to the power supply terminal, and the base of the third triode Q3 is also connected to the control terminal of the high-voltage relay through the third diode D3.

[0060] Specifically, when the two input signals of the AND gate U3 both reach the high level, it proves that both the voltage amplitude and the duration of the input signal meet the detection requirements. At this time, the AND gate U3 outputs a high level. Since the input signal disappears after 0.5 - 0.63 ms, the third triode Q3 and the fourth triode Q4 are used to latch the input signal. The conduction of the fourth triode Q4 causes the third triode Q3 to conduct, and the conduction of the third triode Q3 can maintain the continuous input of the fourth triode Q4. The third diode D3 can ensure that the final output signal ACTIVE-LOW is at the low level, so that the 12V high voltage does not affect the external signal. The output signal ACTIVE-LOW can adjust the high-voltage relay control signal to make it invalid, so as to cut off the high-voltage output and complete the power-down operation after detecting a collision event, thereby realizing the protection of the battery and the vehicle.

[0061] Figure 2 It is a schematic diagram of the power-down process for collision detection provided in this embodiment.

[0062] As Figure 2 shown, when a vehicle collides and the airbag emits a pulsed current signal of 1.75 A and 0.5 ms, the battery management system needs to identify the voltage across the sampling resistor R4 and the duration, which takes 2 ms for this part. The battery management system performs a collision fault judgment, which takes 3 ms. After detecting a collision accident, the battery management system issues a relay disconnection command to drive the relay to disconnect and complete the high-voltage power-down. The relay drive module takes 1 ms, the arc-breaking time of the relay itself is about 5 - 10 ms, and it takes 1 ms for the battery management system to send a collision signal to the vehicle CAN longitudinal before the relay disconnects. The entire collision detection and power-down process is completed within 12 - 17 ms. Due to the characteristics of short detection time, fast power-down speed, and high safety, it can effectively avoid the safety risks caused by the impact of large currents due to external short circuits of the battery, or the secondary damage caused by the impact on the battery pack.

[0063] Based on the same general inventive concept, the present invention also protects a vehicle, including the collision detection circuit in any of the above embodiments.

[0064] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative labor.

[0065] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A collision detection circuit, characterized in that: include: A signal acquisition module, an amplitude detection module, a duration detection module, a logic level inverter module and an output module; The signal acquisition module is connected to the pulse signal input terminal, the signal acquisition module is also connected to the amplitude detection module, the amplitude detection module is also connected to the duration detection module and the logic level inverter module respectively, and the duration detection module and the logic level inverter module are both connected to the output module; The signal acquisition module is used to acquire pulse signals and convert them into voltage signals, and the amplitude detection module is used to detect the amplitude of the voltage signal to obtain an amplitude signal; The duration detection module is used to detect the duration of the amplitude signal, and the logic level inverter module is used to perform level conversion on the amplitude signal; The output module is used for sending a high voltage cut-off signal when the amplitude signal and the duration meet conditions.

2. The collision detection circuit according to claim 1, characterized in that: The signal acquisition module includes: a filtering unit, a sampling unit and an amplifying unit; One end of the filtering unit is connected to the pulse signal input end, and the other end is connected to the sampling unit, the sampling unit is also connected to the amplifying unit, and the amplifying unit is also connected to the amplitude detection module; The filtering unit is used to filter the pulse signal and convert it into a voltage signal; The sampling unit is used to sample the voltage signal to obtain a sampled voltage; The amplifying unit is used to amplify the sampled voltage.

3. The collision detection circuit according to claim 2, characterized in that: The amplification unit includes: an operational amplifier, a first resistor, a second resistor and a third resistor; The input end of the operational amplifier is connected to the sampling unit through a first resistor and a second resistor respectively, and the output end of the operational amplifier is connected to the amplitude detection unit; One end of the third resistor is connected to the negative input terminal of the operational amplifier, and the other end is connected to the output terminal of the operational amplifier.

4. The collision detection circuit according to claim 1, characterized in that: The amplitude detection module includes: a threshold voltage unit and a comparison unit; The threshold voltage unit and the voltage signal are both connected to the input end of the comparison unit, and the output end of the comparison unit is connected to the duration detection module; The threshold voltage unit is used to set a threshold voltage, and the comparison unit is used to compare the threshold voltage with the output voltage of the signal acquisition module.

5. The collision detection circuit according to claim 4, characterized in that: The threshold voltage unit includes: a sixth resistor, a seventh resistor and a third capacitor; One end of the sixth resistor is connected to the controller, and the other end is grounded through the seventh resistor. The third capacitor is connected in parallel with the seventh resistor, and the third capacitor is also connected to the input end of the comparison unit.

6. The collision detection circuit according to claim 1, characterized in that: The duration detection module includes: an eighth resistor, a ninth resistor, a tenth resistor, a first diode, a second diode, a first transistor and a fourth capacitor; The base of the first transistor is connected to the amplitude detection module through the eighth resistor, and the base of the first transistor is also connected in series with the first diode and the second diode and then connected to the power supply end; The emitter of the first transistor is connected to the power supply end through the ninth resistor, and the collector of the first transistor is connected to the output module; After the fourth capacitor is connected in parallel with the tenth resistor, one end of the fourth capacitor is connected to the collector of the first transistor, and the other end is grounded.

7. The collision detection circuit according to claim 1, characterized in that: The logic level inverter module includes: a second triode, an eleventh resistor, a twelfth resistor, a thirteenth resistor and a fourteenth resistor; The base of the second transistor is connected to the amplitude detection module through the thirteenth resistor, and the base of the second transistor is also connected to the power supply end through the twelfth resistor; The emitter of the second transistor is connected to the power supply end through the eleventh resistor; The collector of the second transistor is grounded through the fourteenth resistor, and the collector of the second transistor is also connected to the output module.

8. The collision detection circuit according to claim 1, characterized in that: The output module includes: an AND gate, a third transistor, a fourth transistor, a third diode, a fifteenth resistor, a sixteenth resistor and a seventeenth resistor; The input end of the AND gate is connected to the duration detection module and the logic level inverter module respectively, and the output end of the AND gate is connected to the base of the fourth transistor through the seventeenth resistor; The base of the fourth triode is also connected to the collector of the third triode through the sixteenth resistor, the emitter of the fourth triode is grounded, and the collector of the fourth triode is connected to the base of the third triode; The base of the third transistor is connected to the power supply end through the fifteenth resistor, the emitter of the third transistor is connected to the power supply end, and the base of the third transistor is also connected to the control end of the high-voltage relay through the third diode.

9. The collision detection circuit according to any one of claims 1 to 8, characterized in that: The high voltage cut-off signal is a low level signal.

10. A vehicle, characterized in that: The method comprises a collision detection circuit as claimed in any one of claims 1 to 9.

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