A collision signal detection circuit, device and battery management system

Abstract

The utility model discloses a kind of collision signal detection circuit, device and battery management system, including external signal processing circuit, control unit and diagnostic circuit, wherein, external signal processing circuit includes port protection circuit, filter circuit, level conversion circuit and diagnostic circuit, diagnostic circuit is constituted by seventh resistance, eighth resistance and second triode, collision signal is converted to the level range compatible with control unit by external signal processing circuit conversion after the input of external signal input end, while control unit controls diagnostic circuit to check collision signal received with the diagnostic signal it sends, to identify whether collision detection circuit works normally, and the above-mentioned circuit can improve collision signal detection accuracy.

Description

Technical Field

[0001] This utility model relates to the field of collision signal detection technology, and in particular to a collision signal detection circuit, device and battery management system. Background Technology

[0002] When a vehicle collision occurs, it takes timely protective measures, such as disconnecting the powertrain from the vehicle to prevent further damage to the powertrain or serious accidents threatening the driver's safety, such as high-voltage leaks. Therefore, vehicles typically need to implement power-off protection or other protective measures in the event of a collision. The vehicle's powertrain controller needs to receive collision signals from the collision sensors to execute appropriate protective measures. However, the complex operating environment of vehicles means that interference with collision signal transmission can cause the vehicle to falsely trigger collision protection measures. Consequently, existing collision signal detection circuit technologies cannot guarantee the accuracy of collision signal detection. Utility Model Content

[0003] This invention provides a collision signal detection circuit, device, and battery management system to solve the technical problem that interference easily exists in the collision signal detection circuit in the prior art, resulting in low accuracy of collision signal detection.

[0004] To achieve the above objectives, this utility model provides a collision signal detection circuit, which includes an external signal processing circuit, a control unit, and a diagnostic circuit, wherein...

[0005] The external signal processing circuit includes a port protection circuit, a filtering circuit, and a level conversion circuit. The input terminals of the port protection circuit and the filtering circuit are respectively connected to the external signal input terminal. The output terminal of the filtering circuit is connected to the input terminal of the level conversion circuit, and the output terminal of the level conversion circuit is connected to the input terminal of the control unit.

[0006] The diagnostic circuit includes a seventh resistor, an eighth resistor, and a second transistor. The first end of the seventh resistor is connected to the output terminal of the control unit, the second end of the seventh resistor is connected to the first end of the eighth resistor, the second end of the eighth resistor is grounded, the base of the second transistor is connected to the second end of the seventh resistor, the collector of the second transistor is connected to the output terminal of the filter circuit, and the emitter of the second transistor is grounded.

[0007] In one possible implementation of the first aspect, the port protection circuit includes a first diode and a first capacitor, wherein the anode of the first diode is used to connect to an external signal input terminal, the cathode of the first diode is grounded, the first terminal of the first capacitor is used to connect to an external signal input terminal, and the second terminal of the first capacitor is grounded.

[0008] The filter circuit includes a second capacitor, a second resistor, and a third capacitor. The first terminal of the second capacitor and the first terminal of the second resistor are respectively used to connect to the external signal input terminal. The second terminal of the second capacitor is grounded. The second terminal of the second resistor is connected to the first terminal of the third capacitor. The second terminal of the third capacitor is grounded.

[0009] In one possible implementation of the first aspect, the level shifting circuit includes a third diode and a first transistor, wherein,

[0010] The anode of the third diode is connected to the base of the first transistor, the cathode of the third diode is connected to the second terminal of the second resistor, the emitter of the first transistor is connected to the power supply, and the collector of the first transistor is connected to the input terminal of the control unit.

[0011] In one possible implementation of the first aspect, the level shifting circuit further includes a third resistor and a fourth resistor, wherein,

[0012] The first end of the fourth resistor is connected to the power supply. The second end of the fourth resistor is connected to the first end of the third resistor. The first end of the third resistor is also connected to the base of the first transistor. The second end of the third resistor is connected to the anode of the third diode.

[0013] In one possible implementation of the first aspect, the collector of the first transistor is connected to the input terminal of the control unit, including:

[0014] The level conversion circuit also includes a fifth resistor and a sixth resistor. The first end of the fifth resistor is connected to the collector of the first transistor, the second end of the fifth resistor is connected to the first end of the sixth resistor, the second end of the sixth resistor is grounded, and the second end of the fifth resistor is connected to the input terminal of the control unit.

[0015] In one possible implementation of the first aspect, the external signal processing circuit further includes a current limiting sub-circuit, wherein,

[0016] The current limiting sub-circuit includes a first resistor and a second diode, wherein the first end of the first resistor is connected to the power supply, the second end of the first resistor is connected to the positive terminal of the second diode, and the negative terminal of the second diode is connected to the first end of the second resistor.

[0017] In one possible implementation of the first aspect, an external signal input terminal is used to input a collision signal to an external signal processing circuit, and a control unit is used to issue a diagnostic signal and control the diagnostic circuit.

[0018] In one possible implementation of the first aspect, the diagnostic circuit is used to verify the collision signal against the diagnostic signal.

[0019] A second aspect of this utility model provides a collision signal detection device, which includes a collision signal detection circuit according to the second aspect of this utility model.

[0020] A third aspect of this utility model provides a battery management system, which includes a collision signal detection circuit of the first aspect of this utility model, or a collision signal detection device of the second aspect of this utility model.

[0021] The technical solution of this utility model has the following advantages:

[0022] The collision signal detection circuit provided in this embodiment includes an external signal processing circuit, a control unit, and a diagnostic circuit. The external signal processing circuit includes a port protection circuit, a filtering circuit, a level conversion circuit, and a diagnostic circuit. The diagnostic circuit consists of a seventh resistor, an eighth resistor, and a second transistor. The collision signal input from the external signal input terminal is converted into a level range compatible with the control unit by the external signal processing circuit. Then, the control unit identifies and judges the received converted collision signal and executes the corresponding response strategy. At the same time, the control unit also sends a diagnostic signal that is different from the real collision signal. Then, the control circuit verifies the received collision signal with the sent diagnostic signal to identify whether the collision detection circuit is working properly. The above circuit can improve the accuracy of collision signal detection. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a circuit connection diagram of the collision signal detection circuit in an embodiment of the present invention;

[0025] Figure 2 This is a connection diagram of the level conversion circuit of the collision signal detection circuit in this embodiment of the present invention;

[0026] Figure 3 This is a diagram showing the overall circuit connection structure of the collision signal detection circuit in this embodiment of the present invention.

[0027] Figure 4 This is a block diagram of the collision signal detection circuit in an embodiment of the present invention;

[0028] The reference numerals in the accompanying drawings are as follows: 100, External signal processing circuit; 200, Control unit; 300, Diagnostic circuit; 110, Port protection circuit; 120, Filtering circuit; 130, Level conversion circuit; 140, Current limiting sub-circuit; 11, First diode; 12, Second diode; 13, Third diode; 21, First capacitor; 22, Second capacitor; 23, Third capacitor; 31, First resistor; 32, Second resistor; 33, Third resistor; 34, Fourth resistor; 35, Fifth resistor; 36, Sixth resistor; 37, Seventh resistor; 38, Eighth resistor; 41, First transistor; 42, Second transistor. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] In the description of this utility model, it should be noted that the terms "first", "second" and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal connection of two components; it can be a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] Please refer to Figure 1 This is a schematic diagram of the circuit structure of one embodiment of the collision signal detection circuit provided by this utility model. The collision signal detection circuit includes an external signal processing circuit 100, a control unit 200, and a diagnostic circuit 300, wherein...

[0033] The external signal processing circuit 100 includes a port protection circuit 110, a filter circuit 120, and a level conversion circuit 130. The input terminals of the port protection circuit 110 and the filter circuit 120 are respectively connected to the external signal input terminal. The output terminal of the filter circuit 120 is connected to the input terminal of the level conversion circuit 130, and the output terminal of the level conversion circuit 130 is connected to the input terminal of the control unit 200.

[0034] The diagnostic circuit 300 includes a seventh resistor 37, an eighth resistor 38, and a second transistor 42. The first end of the seventh resistor 37 is connected to the output terminal of the control unit 200, the second end of the seventh resistor 37 is connected to the first end of the eighth resistor 38, the second end of the eighth resistor 38 is grounded, the base of the second transistor 42 is connected to the second end of the seventh resistor 37, the collector of the second transistor 42 is connected to the output terminal of the filter circuit 120, and the emitter of the second transistor 42 is grounded.

[0035] In this embodiment, the collision signal detection circuit includes an external signal processing circuit 100, a control unit 200, and a diagnostic circuit 300. Specifically, the external signal processing circuit 100 includes a port protection circuit 110, a filtering circuit 120, and a level conversion circuit 130, such as... Figure 2 As shown. From Figure 2 As can be seen, the port protection circuit 110 is connected in parallel between the external signal input terminal and ground to suppress overvoltage and noise interference. The filter circuit 120 is connected in series in the signal transmission path to filter the collision signal input from the external signal input terminal. The port protection circuit 110 and the filter circuit 120 work together to ensure that the collision signal input from the external signal input terminal is protected and filtered before being output to the level conversion circuit 130. The level conversion circuit 130 converts the filtered collision signal into a level range compatible with the control unit 200, enabling the control unit 200 to identify and judge the received converted collision signal and then execute the corresponding response strategy.

[0036] It should be noted that the response strategy refers to the specific response measures triggered by the control unit 200 based on the identified collision signal characteristics. The control unit 200 can be a vehicle controller, a microcontroller in the battery management system, or a body controller, and can be configured according to actual needs. The external signal input terminal can be understood as the signal output terminal of external sensors or equipment, used to transmit the collected signals to the external signal processing circuit.

[0037] like Figure 1 and Figure 3 As shown, Figure 3The diagram shows the overall circuit connection structure. The diagnostic circuit 300 consists of a seventh resistor 37, an eighth resistor 38, and a second transistor 42. Specifically, the first terminal of the seventh resistor 37 is connected to the output terminal of the control unit 200, the second terminal of the seventh resistor 37 is connected to the first terminal of the eighth resistor 38, the second terminal of the eighth resistor 38 is grounded, the base of the second transistor 42 is connected to the second terminal of the seventh resistor 37, the collector of the second transistor 42 is connected to the output terminal of the filter circuit 120, and the emitter of the second transistor 42 is grounded. The diagnostic circuit 300 can be controlled by the control unit of the electric vehicle battery management system. The control unit 200 can emit a signal different from the actual collision signal, and the received collision signal is compared with the emitted diagnostic signal to determine whether there is a fault in the collision signal detection circuit.

[0038] In one embodiment, the port protection circuit 110 includes a first diode 11 and a first capacitor 21, wherein the anode of the first diode 11 is used to connect to an external signal input terminal, the cathode of the first diode 11 is grounded, the first terminal of the first capacitor 21 is used to connect to an external signal input terminal, and the second terminal of the first capacitor 21 is grounded.

[0039] The filter circuit includes a second capacitor 22, a second resistor 32, and a third capacitor 23. The first end of the second capacitor 22 and the first end of the second resistor 32 are respectively used to connect to the external signal input terminal. The second end of the second capacitor 22 is grounded. The second end of the second resistor 32 is connected to the first end of the third capacitor 23. The second end of the third capacitor 23 is grounded.

[0040] In this embodiment, the port protection circuit 110 is composed of a first diode 11 and a first capacitor 21. The positive terminal of the first diode 11 is used to connect to the external signal input terminal, and the negative terminal of the first diode 11 is grounded. The first terminal of the first capacitor 21 is used to connect to the external signal input terminal, and the second terminal of the first capacitor 21 is grounded.

[0041] The filter circuit 120 consists of a second capacitor 22, a second resistor 32, and a third capacitor 23, and can filter out some interference signals from the collision signal detection input. Specifically, the first terminal of the second capacitor 22 is connected to the power supply, and the second terminal of the second capacitor 22 is grounded. The first terminal of the second resistor 32 is connected to the external signal input terminal, and the second terminal of the second resistor 32 is connected to the first terminal of the third capacitor 23. The second terminal of the third capacitor 23 is grounded.

[0042] In one embodiment, the level conversion circuit 130 includes a third diode 13 and a first transistor 41, wherein,

[0043] The positive terminal of the third diode 13 is connected to the base of the first transistor 41, the negative terminal of the third diode 13 is connected to the second end of the second resistor 32, the emitter of the first transistor 41 is used to connect to the power supply, and the collector of the first transistor 41 is connected to the input terminal of the control unit (200).

[0044] In this embodiment, as Figure 3 As shown, the level conversion circuit 130 consists of a third diode 13 and a first transistor 41. The level conversion circuit 130 flips the input pulse width modulation frequency (PWM) signal. For example, if the input collision signal is high, the output collision signal is low, and vice versa. The anode of the third diode 13 is connected to the base of the first transistor 41, and the cathode of the third diode 13 is connected to the second terminal of the second resistor 32. The emitter of the first transistor 41 is connected to the power supply, and the collector of the first transistor 41 is connected to the input terminal of the control unit (200).

[0045] In one embodiment, the level conversion circuit 130 further includes a third resistor 33 and a fourth resistor 34, wherein,

[0046] The first end of the fourth resistor 34 is used to connect to the power supply. The second end of the fourth resistor 34 is connected to the first end of the third resistor 33. The first end of the third resistor 33 is also connected to the base of the first transistor 41. The second end of the third resistor 33 is connected to the anode of the third diode 13.

[0047] In this embodiment, the level conversion circuit 130 includes a third resistor 33 and a fourth resistor 34 in addition to the third diode 13 and the first transistor 41. The first end of the fourth resistor 34 is connected to the power supply, the second end of the fourth resistor 34 is connected to the first end of the third resistor 33, the first end of the third resistor 33 is also connected to the base of the first transistor 41, and the second end of the third resistor 33 is connected to the anode of the third diode 13.

[0048] In one embodiment, the collector of the first transistor 41 is connected to the input terminal of the control unit 200. The level conversion circuit 130 further includes a fifth resistor 35 and a sixth resistor 36. The first end of the fifth resistor 35 is connected to the collector of the first transistor 41, the second end of the fifth resistor 35 is connected to the first end of the sixth resistor 36, the second end of the sixth resistor 36 is grounded, and the second end of the fifth resistor 35 is connected to the input terminal of the control unit 200.

[0049] In this embodiment, the voltage division ratio of the fifth resistor 35 and the sixth resistor 36 in the level conversion circuit 130 is also configured to realize the high-level threshold of the output signal, so as to be compatible with the I / O port level of the control unit in the battery management system.

[0050] In one embodiment, the external signal processing circuit 100 further includes a current limiting sub-circuit 140, wherein,

[0051] The current limiting sub-circuit 140 includes a first resistor 31 and a second diode 12, wherein the first end of the first resistor 31 is connected to the power supply, the second end of the first resistor 31 is connected to the positive terminal of the second diode 12, and the negative terminal of the second diode 12 is connected to the first end of the second resistor 32.

[0052] In this embodiment, as Figure 2 As shown, the current limiting sub-circuit 140 includes a first resistor 31 and a second diode 12. Specifically, the first end of the first resistor 31 is connected to the power supply, the second end of the first resistor 31 is connected to the positive terminal of the second diode 12, and the negative terminal of the second diode 12 is connected to the first end of the second capacitor 22, which is used to maintain current stability and automatically limit current flow when the current exceeds a set threshold.

[0053] In one embodiment, the external signal input terminal is used to input a collision signal to the external signal processing circuit, and the control unit is used to issue a diagnostic signal and control the diagnostic circuit.

[0054] In this embodiment, the external signal input terminal is used to receive collision signals from collision sensors (such as acceleration sensors and pressure sensors), and then inputs the collision signals into the external signal processing circuit for processing before inputting them into the control unit 200. After receiving the converted collision signals, the control unit 200 can also send out diagnostic signals and control the diagnostic circuit to verify the converted collision signals and diagnostic signals.

[0055] In one embodiment, the diagnostic circuitry is used to verify the collision signal against the diagnostic signal.

[0056] In this embodiment, the diagnostic circuit is used to verify the collision signal and the diagnostic signal. During the verification of the collision signal and the diagnostic signal, the PWM signal and duty cycle of both are compared. Obtaining the Universal Asynchronous Receiver / Transmitter (UART) collision signal, PWM signal, and duty cycle can be achieved by configuring the UART signal byte format. For example, if the character 0011 corresponds to a frequency of 100Hz and a duty cycle of 50%, then the character 0001 corresponds to a frequency of 100Hz and a duty cycle of 75%. Configuring the UART collision signal character format in this way allows for synchronous identification of collision faults reported by the UART and synchronous reading of the PWM signal frequency and duty cycle. These two can be mutually verified to confirm the authenticity of the collision signal.

[0057] It should be noted that the UART collision signal refers to the collision detection signal transmitted via the UART protocol.

[0058] like Figure 4 As shown, Figure 4 This is a block diagram of the collision signal detection circuit. The port protection circuit is connected to the external signal input terminal to prevent the collision signal detection circuit from being damaged by invalid interference signals. After the collision signal passes through the port protection circuit, it is transmitted to the filtering circuit. The filtering circuit 120 filters out some interference signals, and then the level conversion circuit 130 converts the input collision signal level into a level range compatible with the control unit. Finally, the control unit identifies and judges the received input collision signal and then executes the corresponding response strategy.

[0059] The diagnostic circuit can be controlled by the control unit. By emitting a diagnostic signal that is different from the real collision signal, the control unit verifies the received collision signal with the diagnostic signal it emits. This can identify whether the collision detection circuit is working properly and can reduce the risk of failure of the collision detection circuit itself to a certain extent, thus increasing the circuit's safety level.

[0060] This invention achieves compatibility between PWM signals and UART communication using a single circuit, and can also utilize two circuits for mutual verification to confirm the accuracy of the collision signal. Furthermore, the collision signal detection circuit supports self-diagnostic functions, further ensuring the reliability of collision signal detection, guaranteeing the authenticity of the received collision signal detection, and improving the accuracy of collision signal detection.

[0061] The collision signal detection device provided in this embodiment of the present invention includes the collision signal detection circuit proposed in this embodiment of the present invention.

[0062] The battery management system provided in this embodiment of the present invention includes a collision signal detection circuit or a collision signal detection device proposed in this embodiment of the present invention.

[0063] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit the scope of protection of this utility model. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model by those skilled in the art should be included within the scope of protection of this utility model.

Claims

1. A collision signal detection circuit, characterized in that, It includes an external signal processing circuit (100), a control unit (200), and a diagnostic circuit (300), wherein, The external signal processing circuit (100) includes a port protection circuit (110), a filter circuit (120), and a level conversion circuit (130). The input terminals of the port protection circuit (110) and the filter circuit (120) are respectively connected to an external signal input terminal. The output terminal of the filter circuit (120) is connected to the input terminal of the level conversion circuit (130), and the output terminal of the level conversion circuit (130) is connected to the input terminal of the control unit (200). The diagnostic circuit (300) includes a seventh resistor (37), an eighth resistor (38), and a second transistor (42). The first end of the seventh resistor (37) is connected to the output end of the control unit (200), the second end of the seventh resistor (37) is connected to the first end of the eighth resistor (38), the second end of the eighth resistor (38) is grounded, the base of the second transistor (42) is connected to the second end of the seventh resistor (37), the collector of the second transistor (42) is connected to the output end of the filter circuit (120), and the emitter of the second transistor (42) is grounded.

2. The collision signal detection circuit as described in claim 1, characterized in that, The port protection circuit (110) includes a first diode (11) and a first capacitor (21), wherein the positive terminal of the first diode (11) is used to connect to the external signal input terminal, the negative terminal of the first diode (11) is grounded, the first end of the first capacitor (21) is used to connect to the external signal input terminal, and the second end of the first capacitor (21) is grounded. The filter circuit (120) includes a second capacitor (22), a second resistor (32) and a third capacitor (23). The first end of the second capacitor (22) and the first end of the second resistor (32) are respectively used to connect to the external signal input terminal. The second end of the second capacitor (22) is connected to ground. The second end of the second resistor (32) is connected to the first end of the third capacitor (23). The second end of the third capacitor (23) is connected to ground.

3. The collision signal detection circuit as described in claim 2, characterized in that, The level conversion circuit (130) includes a third diode (13) and a first transistor (41), wherein, The positive terminal of the third diode (13) is connected to the base of the first transistor (41), the negative terminal of the third diode (13) is connected to the second end of the second resistor (32), the emitter of the first transistor (41) is used to connect to the power supply, and the collector of the first transistor (41) is connected to the input terminal of the control unit (200).

4. The collision signal detection circuit as described in claim 3, characterized in that, The level conversion circuit (130) further includes a third resistor (33) and a fourth resistor (34), wherein, The first end of the fourth resistor (34) is used to connect to the power supply, the second end of the fourth resistor (34) is connected to the first end of the third resistor (33), the first end of the third resistor (33) is also connected to the base of the first transistor (41), and the second end of the third resistor (33) is connected to the positive terminal of the third diode (13).

5. The collision signal detection circuit as described in claim 3, characterized in that, The collector of the first transistor (41) is connected to the input terminal of the control unit (200), including: The level conversion circuit (130) further includes a fifth resistor (35) and a sixth resistor (36), wherein the first end of the fifth resistor (35) is connected to the collector of the first transistor (41), the second end of the fifth resistor (35) is connected to the first end of the sixth resistor (36), the second end of the sixth resistor (36) is grounded, and the second end of the fifth resistor (35) is connected to the input terminal of the control unit (200).

6. The collision signal detection circuit as described in claim 3, characterized in that, The external signal processing circuit (100) further includes a current limiting sub-circuit (140), wherein, The current limiting sub-circuit (140) includes a first resistor (31) and a second diode (12), wherein the first end of the first resistor (31) is connected to the power supply, the second end of the first resistor (31) is connected to the positive terminal of the second diode (12), and the negative terminal of the second diode (12) is connected to the first end of the second resistor (32).

7. The collision signal detection circuit as described in claim 1, characterized in that, The external signal input terminal is used to input collision signals to the external signal processing circuit, and the control unit is used to issue diagnostic signals and control the diagnostic circuit.

8. The collision signal detection circuit as described in claim 7, characterized in that, The diagnostic circuit is used to verify the collision signal against the diagnostic signal.

9. A collision signal detection device, characterized in that, The collision signal detection device includes the collision signal detection circuit according to any one of claims 1-8.

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

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