Collision detection circuit, battery management system and vehicle

Abstract

The utility model provides a collision detection circuit, a battery management system and a vehicle, which belong to the technical field of safety detection and comprise a current input end, a first comparison module, an amplification module, a second comparison module, a third comparison module and a control module, the first comparison module is used for detecting real-time current, the amplification module is used for amplifying an output signal of the first comparison module, the second comparison module is used for carrying out collision verification on the amplified signal, and the third comparison module is used for outputting a collision signal; the control module is used for determining whether collision occurs according to the signal after collision verification, and is also used for jointly controlling the closing or opening of the contactor according to the signal after collision verification and the collision signal, and through the amplification of the amplification module, whether collision occurs can be detected more accurately; the impact of detection errors caused by current fluctuation is eliminated, and the accuracy of collision detection is effectively improved.

Description

Technical Field

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

[0002] With the rapid development of the automotive industry and the increasing attention of people to driving safety, vehicle collision detection, as an important part of vehicle safety, has become a hot spot and focus of current research. The purpose of vehicle collision detection is to quickly and accurately identify a collision event through a series of technical means before or during a vehicle collision, so as to take corresponding safety measures to protect the safety of the occupants in the vehicle and reduce accident losses. Currently, there is a detection method for vehicle collision detection that determines whether a collision has occurred by connecting a voltage pulse signal generated by a safety airbag control unit.

[0003] However, the method of detecting collisions by voltage pulse signals is prone to poor collision detection accuracy due to the relatively small voltage itself. Summary of the Utility Model

[0004] The utility model provides a collision detection circuit, a battery management system and a vehicle to solve the defect of poor collision detection accuracy in the prior art.

[0005] On the one hand, the utility model provides a collision detection circuit, including: a current input end, a first comparison module, an amplification module, a second comparison module, a third comparison module and a control module;

[0006] One end of the current input end is connected to a collision sensor, the other end of the current input end is connected to the input end of the first comparison module, the output end of the first comparison module is respectively connected to the input end of the amplification module and the input end of the third comparison module, the output end of the amplification module is connected to the input end of the second comparison module, and the output ends of the second comparison module and the third comparison module are connected to the control module;

[0007] The first comparison module is used to detect the real-time current, the amplification module is used to amplify the output signal of the first comparison module, the second comparison module is used to perform collision verification on the amplified signal, and the third comparison module is used to output a collision signal;

[0008] The control module is used to determine whether a collision has occurred through the signal after collision verification, and is also used to jointly control the closing or opening of a contactor through the signal after collision verification and the collision signal.

[0009] According to a collision detection circuit provided by the utility model, the current input end includes: a detection resistor;

[0010] The detection resistor is connected in parallel across both ends of the collision sensor and also across both ends of the first comparison module;

[0011] The detection resistor is used to detect the change in current output by the collision sensor.

[0012] According to a collision detection circuit provided by the present utility model, the first comparison module includes: a first comparison chip, a first current-limiting resistor, and a second current-limiting resistor;

[0013] The positive input terminal of the first comparison chip is connected to one end of the detection resistor through the first current-limiting resistor, the negative input terminal of the first comparison chip is connected to the other end of the detection resistor through the second current-limiting resistor, and the output terminal of the first comparison chip is respectively connected to the amplification module and the third comparison module;

[0014] The first comparison chip is used to output the voltage waveform of the detection resistor.

[0015] According to a collision detection circuit provided by the present utility model, the control module includes: a controller, an AND gate, and a contactor control component;

[0016] The controller is respectively connected to the output terminal of the second comparison module and the contactor control component, the input terminals of the AND gate are respectively connected to the output terminal of the second comparison module and the output terminal of the third comparison module, and the output terminal of the AND gate is connected to the contactor control component;

[0017] The controller is used to determine whether a collision has occurred through the output signal of the second comparison module, and is also used to jointly control the contactor control component with the output signal of the AND gate. The contactor control component is used to control the closing or opening of the contactor.

[0018] According to a collision detection circuit provided by the present utility model, the contactor control component includes a latch and a control switch;

[0019] The latch is respectively connected to the output terminal of the AND gate and the controller, and the latch is also connected to the contactor through the control switch;

[0020] The latch is used to control the closing or opening of the contactor through the control switch.

[0021] According to a collision detection circuit provided by the present utility model, the control switch is a triode.

[0022] According to a collision detection circuit provided by the present utility model, the amplification module includes: an amplification chip and a ratio adjustment resistor;

[0023] The output end of the amplification chip is connected to the output end of the first comparison module, and the amplification chip is also connected to the input end of the second comparison module. The proportional adjustment resistor is respectively connected to the negative input end and the output end of the amplification chip;

[0024] The proportional adjustment resistor is used to adjust the amplification ratio of the amplification chip, and the amplification chip is used to amplify the output signal of the first comparison module by the amplification ratio.

[0025] According to a collision detection circuit provided by the present invention, the proportional adjustment resistor includes: a second resistor and a third resistor;

[0026] One end of the second resistor is grounded, and the other end is connected to the negative input end of the amplification chip. One end of the third resistor is connected to the negative input end of the amplification chip, and the other end is connected to the output end of the amplification chip.

[0027] The present invention also provides a battery management system, including the collision detection circuit described in any one of the above.

[0028] The present invention also provides a vehicle, including the collision detection circuit described in any one of the above or the battery management system described above.

[0029] A collision detection circuit, a battery management system and a vehicle provided by the present invention include: a current input end, a first comparison module, an amplification module, a second comparison module, a third comparison module and a control module; one end of the current input end is connected to a collision sensor, and the other end of the current input end is connected to the input end of the first comparison module. The output end of the first comparison module is respectively connected to the input end of the amplification module and the input end of the third comparison module. The output end of the amplification module is connected to the input end of the second comparison module. The output ends of the second comparison module and the third comparison module are connected to the control module; the first comparison module is used to detect the real-time current, the amplification module is used to amplify the output signal of the first comparison module, the second comparison module is used to perform collision verification on the amplified signal, and the third comparison module is used to output a collision signal; the control module is used to determine whether a collision has occurred through the signal after collision verification, and is also used to jointly control the closing or opening of the contactor through the signal after collision verification and the collision signal. Through the amplification of the amplification module, it is possible to more accurately detect whether a collision has occurred, eliminate the influence of detection errors caused by current fluctuations, and effectively improve the accuracy of collision detection. Description of the Drawings

[0030] 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, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a schematic structural diagram of a collision detection circuit provided by an embodiment of the present utility model.

[0032] Reference numerals:

[0033] 1. Current input terminal; 2. First comparison module; 3. Amplification module; 4. Second comparison module; 5. Third comparison module. Detailed implementation manners

[0034] 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 with reference to the drawings in the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present utility model belong to the scope protected by the present utility model.

[0035] Figure 1 It is a schematic structural diagram of a collision detection circuit provided by an embodiment of the present utility model.

[0036] As Figure 1 shown, a collision detection circuit provided in this embodiment includes: a current input terminal 1, a first comparison module 2, an amplification module 3, a second comparison module 4, a third comparison module 5, and a control module; one end of the current input terminal 1 is connected to a collision sensor, the other end of the current input terminal 1 is connected to the input terminal of the first comparison module 2, the output terminal of the first comparison module 2 is respectively connected to the input terminal of the amplification module 3 and the input terminal of the third comparison module 5, the output terminal of the amplification module 3 is connected to the input terminal of the second comparison module 4, and the output terminals of the second comparison module 4 and the third comparison module 5 are connected to the control module; the first comparison module 2 is used to detect the real-time current, the amplification module 3 is used to amplify the output signal of the first comparison module 2, the second comparison module 4 is used to perform collision verification on the amplified signal, and the third comparison module 5 is used to output a collision signal; the control module is used to determine whether a collision occurs based on the signal after collision verification, and is also used to jointly control the closing or opening of the contactor through the signal after collision verification and the collision signal. Among them, Figure 1 Rx, where x = 1 / 2 / 3…, in

[0037] In a specific implementation process, taking a vehicle as an example for illustration, first, the usage environment of this collision detection circuit is that the collision sensor is connected through the current input terminal 1. The collision sensor is mainly used to detect whether a vehicle has collided. When no collision occurs, the current range at the current input terminal 1 is between 15 mA and 100 mA. When a collision occurs, the current pulse at the current input terminal 1 changes, and the minimum mutation amplitude can be 1.75 A, and the duration can be 0.5 ms. When no collision occurs, since the first comparison module 2 does not detect a collision signal, it outputs a low level, and all subsequent module devices do not work, which can be understood as being in a sleep state. When a collision occurs, the first comparison module 2 outputs a high level after comparison and judgment. The signal output by the first comparison module 2 at this time indicates that a collision has occurred. To ensure the accuracy of detection, the output signal of the first comparison module 2 is amplified by a preset ratio through the amplification module 3, and then the amplified signal is detected by the second comparison module 4. When it is greater than the target threshold, it indicates that a collision has occurred, and then the collision signal is sent to the controller to perform relevant safety actions through the controller. Due to the actual signal detection by the first comparison module 2 and the amplified signal detection by the second comparison module 4, the accuracy of the collision detection result can be better guaranteed.

[0038] The third comparison module 5 compares the output result of the first comparison module 2 with the output result of the second comparison module 4. Only when both detect a collision, the control module will control the closing or opening of the contactor. Since the contactor is controlled by the controller, the safety of subsequent devices can be better guaranteed. Compared with the common way of automatic closing of the contactor, the safety of the vehicle circuit can be better guaranteed.

[0039] Through the amplification function of the amplification module 3, it can be more accurately determined whether the signal detected by the current first comparison module 2 is correct, and more accurately determine whether a collision has occurred. Thus, while ensuring safety, it can also avoid the safety hazard problems caused by false detection.

[0040] Further, on the basis of the above embodiments, as Figure 1As shown in the figure, the current input terminal 1 in this embodiment includes: a detection resistor R1; the detection resistor R1 is connected in parallel across both ends of the collision sensor and also across both ends of the first comparison module 2; the detection resistor R1 is used to detect the current change output by the collision sensor. The first comparison module 2 includes: a first comparison chip U1, a first current-limiting resistor R5, and a second current-limiting resistor R6; the positive input terminal of the first comparison chip U1 is connected to one end of the detection resistor R1 through the first current-limiting resistor R5, the negative input terminal of the first comparison chip U1 is connected to the other end of the detection resistor R1 through the second current-limiting resistor R6, and the output terminal of the first comparison chip U1 is respectively connected to the amplification module 3 and the third comparison module 5; the first comparison chip U1 is used to output the voltage waveform of the detection resistor R1.

[0041] Specifically, in this embodiment, the resistance value of the detection resistor R1 can be set to 2 ohms. By determining the current change flowing through the detection resistor R1, it is possible to determine whether a collision has occurred. The output voltage of the first comparison chip U1 is the voltage of the detection resistor R1, so that the voltage value of the detection resistor R1 can be accurately output, and then the current change situation of the detection resistor R1 can be detected. The first current-limiting resistor R5 and the second current-limiting resistor R6 can also ensure the safety of the first comparison chip U1 and the subsequent circuit.

[0042] Further, on the basis of the above embodiment, as Figure 1 shown in the figure, the control module in this embodiment includes: a controller, an AND gate U5, and a contactor control component; the controller is respectively connected to the output terminal of the second comparison module 4 and the contactor control component, the input terminals of the AND gate U5 are respectively connected to the output terminal of the second comparison module 4 and the output terminal of the third comparison module 5, and the output terminal of the AND gate U5 is connected to the contactor control component; the controller is used to determine whether a collision has occurred through the output signal of the second comparison module 4, and is also used to jointly control the contactor control component with the output signal of the AND gate U5, and the contactor control component is used to control the closing or opening of the contactor. The contactor control component includes a latch U6 and a control switch Q1; the latch U6 is respectively connected to the output terminal of the AND gate U5 and the controller, and the latch U6 is also connected to the contactor through the control switch Q1; the latch U6 is used to control the closing or opening of the contactor through the control switch Q1. The control switch Q1 is a triode.

[0043] The controller can be a Microcontroller Unit (MCU). One of its functions is to output corresponding control signals according to the output result of the third comparison module 5 to complete the control of other devices or components in the vehicle, so as to ensure comprehensive and multi-faceted protection of people after a collision. The second function is to control the contactor. Through the cooperation of the latch U6 and the control switch Q1, the control of the contactor is completed. The contactor will only close after receiving the control of the controller, thus avoiding the free closing of the contactor during a collision and better ensuring safety.

[0044] Further, on the basis of the above embodiment, as Figure 1 shown, the amplification module 3 in this embodiment includes: an amplification chip U2 and a proportional adjustment resistor; the amplification chip U2 is connected to the output terminal of the first comparison module 2, and the amplification chip U2 is also connected to the input terminal of the second comparison module 4. The proportional adjustment resistor is respectively connected to the negative input terminal and the output terminal of the amplification chip U2; the proportional adjustment resistor is used to adjust the amplification ratio of the amplification chip U2, and the amplification chip U2 is used to amplify the output signal of the first comparison module 2 by a certain ratio. The proportional adjustment resistor includes: a second resistor R7 and a third resistor R10; one end of the second resistor R7 is grounded, and the other end is connected to the negative input terminal of the amplification chip U2. One end of the third resistor R10 is connected to the negative input terminal of the amplification chip U2, and the other end is connected to the output terminal of the amplification chip U2.

[0045] Specifically, the second comparison module 4 includes a second comparison chip U3, and the third comparison module 5 includes a third comparison chip U4. As Figure 1 shown, after the amplification module 3 amplifies the output voltage of the first comparison module 2 by a specific ratio, it outputs a waveform with a suitable voltage value. This voltage waveform is input to the positive input terminal of the second comparison module 4 and compared with a specific voltage value at the negative input terminal of the second comparison circuit. If the voltage at the positive input terminal of the second comparison module 4 > the voltage at the negative input terminal, the second comparison module 4 outputs a high level of VCC. If the voltage at the positive input terminal of the second comparison module 4 < the voltage at the negative input terminal, the output voltage of the second comparison module 4 is 0V. The voltage value output by the second comparison module 4 is sent to the MCU. By detecting the output voltage value of the second comparison module 4 by the MCU, it is judged whether a collision has occurred. When no collision occurs, the output voltage of the second comparison module 4 collected by the MCU is 0V. The function of the third comparison module 5 is to compare with a specific voltage value at the negative input terminal of the second comparison module 4. If the voltage at the positive input terminal of the third comparison module 5 > the voltage at the negative input terminal, the output voltage of the third comparison module 5 is a high level of VCC. If the voltage at the positive input terminal of the third comparison module 5 < the voltage at the negative input terminal, the output voltage of the third comparison module 5 is 0V. Thus, the accurate detection of the collision is completed.

[0046] The function of the AND gate U5 is to perform an AND operation on the output results of the third comparison chip U4 and the second comparison chip U3. Then, after being input into the register and combined with the control signal of the control module, it realizes the control of the control switch Q1, so that the contactor will not automatically close in the case of a collision, effectively ensuring the safety of the devices at the back end of the contactor and the safety of vehicle personnel.

[0047] Among them, in the comparison module, the detection of a larger current range can be achieved by changing the ratio between the resistance values in the circuit. Using the first comparison module 2 to detect the magnitude of the current flowing through the detection resistor R1, the structure is simple and the detection result is accurate. Combined with the amplification function of the amplification module 3, it is also possible to better determine whether a collision has occurred through verification, further ensuring the accuracy of the collision detection result.

[0048] Based on the same general inventive concept, the present invention also protects a battery management system, including the collision detection circuit in any of the above embodiments.

[0049] 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 or the battery management system in the above embodiments.

[0050] 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 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 in this embodiment. Those of ordinary skill in the art can understand and implement it without creative labor.

[0051] 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 this 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, which can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions for causing 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.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; 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; and 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 various embodiments of the present invention.

Claims

1. A collision detection circuit, characterized in that, Comprising: A current input terminal, a first comparison module, an amplification module, a second comparison module, a third comparison module, and a control module; One end of the current input terminal is connected to a collision sensor, the other end of the current input terminal is connected to the input end of the first comparison module, the output end of the first comparison module is respectively connected to the input end of the amplification module and the input end of the third comparison module, the output end of the amplification module is connected to the input end of the second comparison module, and the output ends of the second comparison module and the third comparison module are connected to the control module; The first comparison module is used to detect the real-time current, the amplification module is used to amplify the output signal of the first comparison module, the second comparison module is used to perform collision verification on the amplified signal, and the third comparison module is used to output a collision signal; The control module is used to determine whether a collision has occurred through the signal after collision verification, and is also used to jointly control the closing or opening of the contactor through the signal after collision verification and the collision signal.

2. The collision detection circuit according to claim 1, wherein The current input terminal includes: a detection resistor; The detection resistor is connected in parallel across both ends of the collision sensor and is also connected in parallel across both ends of the first comparison module; The detection resistor is used to detect the current change output by the collision sensor.

3. The collision detection circuit according to claim 2, wherein The first comparison module includes: a first comparison chip, a first current-limiting resistor, and a second current-limiting resistor; The positive input terminal of the first comparison chip is connected to one end of the detection resistor through the first current-limiting resistor, the negative input terminal of the first comparison chip is connected to the other end of the detection resistor through the second current-limiting resistor, and the output end of the first comparison chip is respectively connected to the amplification module and the third comparison module; The first comparison chip is used to output the voltage waveform of the detection resistor.

4. The collision detection circuit according to claim 1, wherein The control module includes: a controller, an AND gate, and a contactor control component; The controller is respectively connected to the output end of the second comparison module and the contactor control component, the input ends of the AND gate are respectively connected to the output end of the second comparison module and the output end of the third comparison module, and the output end of the AND gate is connected to the contactor control component; The controller is used to determine whether a collision has occurred through the output signal of the second comparison module, and is also used to jointly control the contactor control component with the output signal of the AND gate. The contactor control component is used to control the closing or opening of the contactor.

5. The collision detection circuit according to claim 4, wherein The contactor control component includes a latch and a control switch; The latch is respectively connected to the output end of the AND gate and the controller, and the latch is also connected to the contactor through the control switch; The latch is used to control the closing or opening of the contactor through the control switch.

6. The collision detection circuit according to claim 5, wherein, The control switch is a triode.

7. The collision detection circuit according to any one of claims 1-6, characterized in that, The amplification module includes: an amplification chip and a proportional adjustment resistor; The amplification chip is connected to the output end of the first comparison module, the amplification chip is also connected to the input end of the second comparison module, and the proportional adjustment resistor is respectively connected to the negative input terminal and the output terminal of the amplification chip; The proportional adjustment resistor is used to adjust the amplification ratio of the amplification chip, and the amplification chip is used to amplify the output signal of the first comparison module by the amplification ratio.

8. The collision detection circuit according to claim 7, wherein The proportional adjustment resistor includes: a second resistor and a third resistor; One end of the second resistor is grounded, and the other end is connected to the negative input terminal of the amplification chip. One end of the third resistor is connected to the negative input terminal of the amplification chip, and the other end is connected to the output terminal of the amplification chip.

9. A battery management system, characterized in that, It includes the collision detection circuit according to any one of claims 1-8.

10. A vehicle, characterized in that, It includes the collision detection circuit according to any one of claims 1-8 or the battery management system according to claim 9.

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