High-voltage interlocking detection system and detection method applied to vehicle, controller and vehicle

Abstract

The present application provides a high voltage interlock detection system for a vehicle, comprising: a plurality of high voltage components, each high voltage component comprising a plug connector; and the low-voltage detection controller is connected with the plug connector of the high-voltage component so as to form a detection loop. The low-voltage detection controller comprises a low-voltage signal source, the low-voltage signal source is used for outputting a PWM signal to enable the PWM signal to be transmitted through the plug connector, and the low-voltage signal source is used for enabling the duty ratio of the output PWM signal to be changed in a preset mode; and the detector is used for receiving the PWM signal transmitted by the plug connector of the high-voltage component and generating a signal representing abnormity when the duty ratio change of the received PWM signal is inconsistent with the preset mode. The invention further provides a detection method.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicles, and more specifically, to high voltage interlock detection technology. Background Art

[0002] With the increasing popularity of new energy vehicles, high voltage safety has received more and more attention. The High Voltage Inter-lock (HVIL) system, also known as the high voltage interlock circuit, has emerged. The high voltage interlock circuit uses low voltage signals to check all components connected to the high voltage wiring harness on new energy vehicles, and detect the electrical connection integrity and continuity of each high voltage system circuit.

[0003] In recent times, the design of high-voltage interlocking circuits has been continuously improved. However, due to the increase in high-voltage components in new energy vehicles, the high-voltage interlocking circuits are relatively long, and there is still room for improvement in false alarms and wrong alarms. Summary of the invention

[0004] The present application provides a high-voltage interlock detection system for a vehicle to improve the detection performance of a high-voltage interlock circuit, thereby making the functional safety of the vehicle more complete. The high-voltage interlock detection system includes: a plurality of high-voltage components, each of which includes a connector for connecting it to the high-voltage interlock detection system; and a low-voltage detection controller connected to the connector of the high-voltage component to form a detection circuit. The low-voltage detection controller includes a low-voltage signal source, which is used to output a PWM signal so that the PWM signal is transmitted via the connector, and the low-voltage signal source is used to change the duty cycle of the output PWM signal in a preset manner; a detector, which is used to receive the PWM signal transmitted by the connector, and when the duty cycle change of the received PWM signal is inconsistent with the preset manner, a signal indicating an abnormality is generated.

[0005] The high-voltage interlock detection system for a vehicle may, optionally or additionally, have the low-voltage signal source used to change the duty cycle of the output PWM signal in a preset manner, including: the low-voltage signal source changes the duty cycle of the PWM signal according to a change period, wherein the change period is greater than the period of the PWM signal.

[0006] The high-voltage interlock detection system for a vehicle may, optionally or additionally, have the variation period be n times the period of the PWM signal, where n is an integer.

[0007] The high-voltage interlock detection system for a vehicle may, optionally or additionally, be configured such that the low-voltage detection controller is configured to take safety measures when a duty cycle change of the received PWM signal is inconsistent with the preset mode.

[0008] The high-voltage interlock detection system for a vehicle may, optionally or additionally, have the connectors included in each of the high-voltage components connected in series to the low-voltage detection controller. In this example, the PWM signal output by the low-voltage signal source is received by one of the connectors and transmitted to the detector after passing through the remaining connectors in sequence.

[0009] The high-voltage interlock detection system for a vehicle may, optionally or additionally, have the connectors included in each of the high-voltage components connected in parallel to the low-voltage detection controller.

[0010] According to another aspect of the present application, a high-voltage interlock detection method for a vehicle is also provided, the method comprising: sending a PWM signal to a connector of a high-voltage component of the vehicle, wherein the duty cycle of the sent PWM signal changes in a preset manner; the PWM signal is transmitted by the connector of the high-voltage component, and a detector receives the PWM signal transmitted by the connector; when the duty cycle change of the received PWM signal is inconsistent with the preset manner, the detector generates a signal indicating an abnormality.

[0011] The high-voltage interlock detection method for a vehicle may, optionally or additionally, include the preset manner comprising changing the duty cycle of the PWM signal according to a change period, wherein the change period is greater than the period of the PWM signal.

[0012] In the high-voltage interlock detection method for a vehicle, optionally or supplementally, the variation period is n times the period of the PWM signal, where n is an integer.

[0013] A controller for high-voltage interlock detection of a vehicle is also provided, which includes a memory and a processor, wherein the memory includes instructions, and the processor is used to execute the instructions and implement any one of the above-mentioned high-voltage interlock detection methods for a vehicle in the process of executing the instructions.

[0014] A vehicle is also provided, which includes any one of the above high-voltage interlock detection systems for vehicles, or is configured to execute any one of the above high-voltage interlock detection system methods for vehicles, or includes the controller described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following will describe the embodiments of the present application in detail with reference to the accompanying drawings so that the present application can be more fully understood, wherein:

[0016] Figure 1 is a schematic structural diagram of a high voltage interlock detection system according to some embodiments of the present application;

[0017] Figure 2 is a flow chart of a high voltage interlock detection method applied to a vehicle according to an example of the present application;

[0018] Figure 3 It shows the output of PWM signal in a preset mode;

[0019] Figure 4 yes Figure 3 Schematic diagram of PWM signal in the middle period 30;

[0020] Figure 5 yes Figure 3 Schematic diagram of PWM signal in the middle period 31;

[0021] Figure 6 is a structural diagram of a controller for high voltage interlock detection of a vehicle according to some examples of the present application. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings to clearly and completely describe the implementation methods of the present application. It should be noted that the described implementation methods are only part of the implementation methods of the technical solution of the present application, not all. All other implementation methods obtained by ordinary technicians in this field based on the implementation methods recorded in the application documents without paying creative work are covered by the protection scope of the present application.

[0023] The terms "first", "second", etc. in the specification, claims and drawings of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the invention described herein can be implemented in an order other than those illustrated or described herein. In addition, "first" and "second" are used for descriptive purposes only and are not to be understood as expressly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, unless otherwise stated, "multiple" means two or more.

[0024] As used hereinafter, the words “example” or “exemplarily” or “exemplarily” mean “serving as an example, embodiment, or illustration.” Any embodiment described as “example” or “exemplarily” or “exemplarily” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0025] The present application provides a high-voltage interlock detection system, which is used to at least detect unexpected circuit breaks in a high-voltage system / high-voltage component in a vehicle, such as a fuel cell engine system of the vehicle, and high-voltage components such as an air recirculation pump, an electric air compressor, a PTC heater, a cooling water pump, and a DCDC converter.

[0026] Figure 1 is a schematic diagram of the structure of a high voltage interlock detection system according to some embodiments of the present application. Figure 1 As shown, the high-voltage interlock detection system includes a plurality of high-voltage components 20, a plug-in connector disposed in each high-voltage component, and a high-voltage interlock controller 10. The high-voltage interlock controller 10 includes a low-voltage signal source 100 and a detector 102. Each high-voltage component 20 is connected to the high-voltage interlock circuit through a plug-in connector disposed therein. In some examples of the present application, the plug-ins of each high-voltage component 20 are connected in series to each other and connected to the high-voltage interlock controller 10.

[0027] Take the high voltage component 20 including high voltage components 201, 202, 203, 204 and 205 as an example. The detection input port J1 of the connector of the high voltage component 201 is electrically connected to the low voltage signal source 100 of the high voltage interlock controller 10. In a more specific example, the low voltage signal source 100 is electrically connected to the connector at one end thereof and has a port matching the connector. 1-in The output port J2 of the connector of the high-voltage component 201 is connected to the input port J1 of the connector of the high-voltage component 202. More specifically, the connection line between the output port J2 of the connector of the high-voltage component 201 and the input port J1 of the connector of the high-voltage component 202 has ports that match J2 and J1, respectively. Generally speaking, the interface of the connection line for the input port J1 of the connector of the high-voltage component 202 is consistent with the port of the connector to which the low-voltage signal source 100 is electrically connected to the above. In the present application, the ports to which the connection line connects the connector of the high-voltage component 201 and the connector of the high-voltage component 202 are marked as J. 2-in and J 1-in .

[0028] The output port J2 of the connector of the high-voltage component 202 is connected to the input port J1 of the connector of the high-voltage component 203, the output port J2 of the connector of the high-voltage component 203 is connected to the input port J1 of the connector of the high-voltage component 204, the output port J2 of the connector of the high-voltage component 204 is connected to the input port J1 of the connector of the high-voltage component 205, and the output port J2 of the connector of the high-voltage component 205 is connected to the detector 102 of the high-voltage interlock controller 10. The above description of the specific connection method of the connector of the high-voltage component 201 and the connector of the high-voltage component 202 is also applied to the interconnection between the high-voltage components 203, 204 and 205, and the more specific connection will not be described in detail. Among them, the output port J2 of the connector of the high-voltage component 205 is connected to the detector 102 through the detector 102 and its corresponding port, and the port is marked as J 2-plugin .

[0029] The low-voltage signal source 100 sends a PWM signal to the connector of the high-voltage component 201. The PWM signal is transmitted through the input port J1 and the output port J2 of the connector of the high-voltage component 201, and is transmitted to the connector of the high-voltage component 202. The PWM signal is then transmitted from the input port J1 and the output port J2 of the connector of the high-voltage component 202 to the connector of the high-voltage component 203. After passing through the path connected by the connector, the PWM signal is finally sent out through the output port J2 of the connector of the high-voltage component 205, and the detector 102 receives the PWM signal.

[0030] In practical applications, the high-voltage components are not limited to those listed above, and may include, for example, more high-voltage components or fewer high-voltage components.

[0031] According to the example of the present application, the high-voltage interlock controller 10 is configured to output a PWM (pulse width modulation) signal with a variable duty cycle through the low-voltage signal source 100 in a preset manner, and is configured to enable the detector 102 to receive the PWM signal and detect whether it is consistent with the preset manner. In the case of inconsistency with the preset manner, the detector 102 generates a signal indicating an abnormality. The high-voltage interlock controller 10 can send the signal indicating the abnormality and can take corresponding safety measures. For example, when the detection result of the detector 102 shows that the low-voltage signal source 100 should send a PWM signal with a duty cycle of Ratio2 in a preset manner, but from the received PWM signal, the low-voltage signal source 100 is still sending a signal with a duty cycle of Ratio1, the high-voltage interlock controller 10 takes safety measures, such as making the relevant control system of the vehicle enter a safe state, such as shutdown, active discharge, etc.; on the other hand, the high-voltage interlock controller 10 also transmits the signal indicating the abnormality to the vehicle controller 30. From the perspective of signal transmission and reception, the low-voltage signal source 100 is the PWM signal transmitting end of the high-voltage interlock controller 10 and the detector 102 is the PWM signal receiving end of the high-voltage interlock controller 10 .

[0032] In some examples, the preset method is to change the duty cycle periodically. For example, the duty cycle of the PWM signal output by the low-voltage signal source 100 is adjusted based on the period T of the PWM signal. Generally speaking, the change period for changing the duty cycle is greater than the period of the PWM signal, and can be n times the period of the PWM signal, where n is greater than or equal to 2 and is an integer. In practical applications, the change period is generally much greater than the PWM signal period. Because the period of the PWM signal may be very short, such as a few milliseconds, and the change period may generally be a few seconds, a dozen or tens of seconds. For example, the period of the PWM signal is 1 millisecond, and the change period in the preset method may be 20 seconds. In the first 10 seconds of the 20-second change period, a PWM signal with a duty cycle of 50% is output, and in the next second 10 seconds, a PWM signal with a duty cycle of 40% is output, and then the next change period is entered. Periodically changing the duty cycle is not limited to this, and the duty cycle of the PWM signal can be changed continuously for multiple times. For example, in four consecutive 20 seconds, the PWM signal is output in a manner of gradually decreasing the PWM signal duty cycle, and in the subsequent several 20 seconds, the PWM signal is output in a manner of gradually increasing the duty cycle. 20 seconds is also just an example here. According to the present application, the detector 102 receives the PWM signal and is configured to detect whether the received PWM signal is consistent with the preset method of outputting the PWM signal by the low-voltage signal source 100.

[0033] By using the high-voltage interlock detection system according to the example of this application, when any high-voltage component has an abnormality in the high-voltage interlock circuit, the PWM signal transmitted to the detector 102 will be different from the signal sent by the signal source 100, thereby being able to know the abnormality of the high-voltage component and prevent false detection, wrong detection, and missed detection. Figure 1 In the example, the connectors of the high-voltage components in the high-voltage interlocking circuit are connected in series, that is, the connectors of each high-voltage component are connected in series to the low-voltage detection controller 10. Alternatively, the connectors of each high-voltage component can be connected to the low-voltage detection controller 10 to form a detection circuit, which is equivalent to the connectors of the high-voltage components in the high-voltage interlocking circuit being connected in parallel. In this case, if any high-voltage component has a problem in the high-voltage interlocking circuit, it is possible to directly determine which high-voltage component is abnormal.

[0034] In addition, since in the example of the present application, the low-voltage signal source 100 of the low-voltage detection controller 10 sends a PWM signal in a preset manner, the preset manner is intended to make the duty cycle of the transmitted PWM signal variable. This makes it possible for the detector 102 to quickly detect the abnormality even if the low-voltage detection controller 10 itself is abnormal, such as when the low-voltage signal source 100 is stuck. For example, after the low-voltage signal source 100 is stuck, the low-voltage controller 10 keeps sending the PWM signal generated by the low-voltage signal source 100 when the stuck occurs, which keeps the duty cycle of the sent PWM signal unchanged. Then the detector 102 still receives the PWM signal of the previous duty cycle when it should receive the PWM signal whose duty cycle changes in a preset manner. In this way, the detector 102 can almost detect the stuck situation of the low-voltage signal source in real time. In the existing high-voltage interlocking loop, the signal source continuously sends a PWM signal with a constant duty cycle, which causes the signal source to be unable to be detected when a fault such as stuck occurs, resulting in missed detection. By adopting the high-voltage interlock detection system according to the present application, the detection of a low-voltage detection controller, such as a fault in a low-voltage signal source, will not be missed, making the detection of the high-voltage interlock detection system more complete and comprehensive, further improving the functional safety of the vehicle.

[0035] Figure 2 1 is a flow chart of a high voltage interlock detection method for a vehicle according to an example of the present application. Figure 2 As shown, in step S200, a PWM signal is sent to the connector of the high-voltage component of the vehicle, and the duty cycle of the sent PWM signal changes in a preset manner. The preset manner may be periodic or other as described above. In step S202, the PWM signal is transmitted by the connector of the high-voltage component. In step S204, the detector receives the PWM signal transmitted via the connector, and determines whether the duty cycle change of the received PWM signal is consistent with the preset manner. In the case where the judgment result is consistent, continue with step S204. In the case where the judgment result is inconsistent, a signal indicating an abnormality is generated, as shown in step S206. According to some examples of the present application, in the case where the judgment result is inconsistent, corresponding safety measures are also taken, such as the above-mentioned making the relevant control system of the vehicle enter a safe state.

[0036] Figure 2 The illustrated method can be implemented as a program module through instructions. On the one hand, the module can be set to the existing high-voltage interlock detection system of the vehicle to perform the following steps: Figure 2 The described high voltage interlock detection method for a vehicle. On the other hand, the module can be implemented in an independent controller.

[0037] Figure 3 The output of a PWM signal in a preset mode is shown. Figure 3 As shown, the horizontal axis is time in seconds, and the vertical axis is the output signal level. Figure 3 In the example, the duty cycle in the preset mode is 20 seconds. In the time period 30 marked with a duration of 10 seconds, the period of the PWM signal is 1 millisecond and the duty cycle is 50%. Accordingly, the time period 30 includes 10,000 PWM signals with a period of 1 millisecond and a duty cycle of 50%. Figure 4 yes Figure 3 The PWM signal in the middle period 30 is shown. Figure 4 As shown, the horizontal axis is time in milliseconds, and the vertical axis is the output signal level. Figure 3 In the time period 31 marked as 10 seconds, the period of the PWM signal itself is 1 millisecond and the duty cycle is 30%. Accordingly, the time period 31 includes 10,000 PWM signals with a period of 1 millisecond and a duty cycle of 30%. Figure 5 yes Figure 3 The schematic diagram of the PWM signal in the middle period 31, wherein the horizontal axis is time in milliseconds and the vertical axis is the output signal level.

[0038] Due to limited space, Figure 3 , Figure 4 as well as Figure 5 The illustrations are not strictly in proportion and only illustrate several signals respectively, so as to more clearly illustrate the embodiments of the present application, but are not intended to be limiting.

[0039] As Figure 3 In the default mode, the duty cycle is 20 seconds, but the duration of period 30 and period 31 can be set as needed, for example, period 30 is 18 seconds, period 31 is 2 seconds, etc.

[0040] As Figure 3 In the preset mode, the duty cycle is 20 seconds, but one change cycle may include more time periods, the length of each time period may be different, and the duty cycle of the PWM signal in each time period may be different.

[0041] In combination with the above Figure 3 In the example and the alternative examples, the variation period is described as 20 seconds, but in fact the variation period can be set as required, for example, greater than 20 seconds or less than 20 seconds.

[0042] Figure 2 The method shown can be used, for example, Figure 1 The high voltage interlock detection system for vehicles shown in the figure will be combined with Figure 2 and Figure 1 The embodiments of the present application are further described. Figure 2 , Figure 1 and Figure 3The low voltage signal source 100 of the high voltage interlock controller 10 is Figure 3 The PWM signal is output in the preset manner shown (step S200), for example, a PWM signal with a duty cycle of 50% is output for 10 seconds in period 30. The input PWM signal passes through the high-voltage components 201, 202, 203, 204 and the respective connectors of the high-voltage component 205 in the high-voltage interlocking circuit in turn, and finally the PWM signal input to the connector of the high-voltage component 201 is transmitted to the detector 102 of the high-voltage interlocking controller 10 by the connector of the high-voltage component 205 (step S202). The detector 102 that receives the PWM signal determines whether the received PWM signal is the same as the preset manner (step S204), that is, whether the received signal is a PWM signal with a duty cycle of 50% for 10 consecutive seconds as in period 30. The low voltage signal source 100 of the high voltage interlock controller 10 outputs a PWM signal with a duty cycle of 30% for 10 seconds in the time period 31 (step S200). Similarly, the PWM signal is transmitted to the detector 102 of the high voltage interlock controller 10 (step S202) via the connectors of the high voltage components 201, 202, 203, 204, and 205 in the high voltage interlock circuit. The detector 102 that receives the PWM signal determines whether the received PWM signal is consistent with the preset mode (step S204), that is, whether the received signal is a PWM signal with a duty cycle of 30% for 10 consecutive seconds as in the time period 31.

[0043] If the detector 102 detects that the received PWM signal is inconsistent with the preset mode in any of the time periods 30 and 31, the detector 102 can generate a signal indicating an abnormality (step S206), and further, the high-voltage interlock controller 10 can control the relevant control system to enter a safe state, such as shutting down and actively discharging; on the other hand, the signal indicating the abnormality can also be transmitted to the vehicle controller 30. For example, in the abnormal situation that the high-voltage interlock controller 10 is stuck in the time period 30, the connector of the high-voltage component 201 has been receiving a PWM signal with a duty cycle of 50%, and the signal has been transmitted to the receiving end of the high-voltage interlock controller 10 via the connector of the high-voltage component. As the receiving end, the detector 102 detects that after entering the time period 31, the received PWM signal has not changed compared with the time period 30, and it can be determined that the high-voltage interlock controller 10 has an abnormality.

[0044] The present application also provides a controller for high voltage interlock detection of a vehicle, Figure 6 The controller includes a memory 60 and a processor 62. The memory 60 includes instructions, and the processor 62 is configured to execute the instructions and implement any one of the high-voltage interlock detection methods for vehicles described above during the execution of the instructions.

[0045] The present application also provides a vehicle, which includes any one of the high-voltage interlock detection systems described above, or can execute any one of the high-voltage interlock detection methods described above.

[0046] The examples of this application can be applied to high-voltage systems of new energy vehicles, such as battery engine systems. In this case, for example Figure 2 The method shown can be implemented in a controller of the FCS, i.e., a fuel cell system controller, or, for example Figure 1 The system shown can be incorporated into an FCS.

[0047] For another example, each example of the present application can also be implemented in a battery management system of an electric vehicle. In this case, for example Figure 2 The method shown can be implemented in a controller of a battery management system BMS, or, for example Figure 1 The system shown may be incorporated into a BMS.

[0048] By using the high-voltage interlock detection system and controller according to each example of the present application or executing the high-voltage interlock detection method according to each example of the present application, since the PWM signal sent in the high-voltage interlock loop changes the duty cycle in a preset manner rather than sending a PWM signal that keeps the duty cycle unchanged, not only can the abnormality of any high-voltage component cause the PWM signal to not be received by the low-voltage signal controller in a preset manner and be detected immediately, but also the abnormality caused by the problem of the low-voltage signal controller itself (such as the low-voltage signal source) can be detected in time, effectively preventing the problem of missed detection of the high-voltage interlock loop. Improvements to the high-voltage interlock loop, such as missed detection, further enhance the functional safety of the vehicle.

[0049] Although specific embodiments of the present application have been shown and described in detail to illustrate the principles of the present application, it should be understood that the present application can be implemented in other ways without departing from such principles.

Claims

1. A high voltage interlock detection system for a vehicle, characterized in that: The system comprises: A plurality of high-voltage components, each of the high-voltage components comprising a connector for connecting the high-voltage interlock detection system; Low voltage detection controller, including: A low-voltage signal source, which is used to output a PWM signal so that the PWM signal is transmitted via the connector, and the low-voltage signal source is used to change the duty cycle of the output PWM signal in a preset manner; The detector is used to receive the PWM signal transmitted by the connector and generate a signal indicating an abnormality when the duty cycle change of the received PWM signal is inconsistent with the preset mode.

2. The system according to claim 1, characterized in that The low voltage signal source is used to change the duty cycle of the output PWM signal in a preset manner, including: the low voltage signal source changes the duty cycle of the PWM signal according to a change period, wherein the change period is greater than the period of the PWM signal.

3. The system according to claim 2, characterized in that: The variation period is n times the period of the PWM signal, where n is an integer.

4. The system according to claim 1, characterized in that The low voltage detection controller is configured to take safety measures when a duty cycle change of the received PWM signal is inconsistent with the preset mode.

5. The system according to any one of claims 1 to 4, characterized in that: The connector included in each of the high-voltage components is serially connected to the low-voltage detection controller.

6. The system according to any one of claims 1 to 4, characterized in that: The connector included in each of the high-voltage components is connected in parallel to the low-voltage detection controller.

7. A high voltage interlock detection method applied to a vehicle, characterized in that: The method comprises: Sending a PWM signal to a connector of a high-voltage component of the vehicle, wherein a duty cycle of the sent PWM signal changes in a preset manner; The PWM signal is transmitted by the connector of the high voltage component; The detector receives the PWM signal transmitted by the connector; When the duty cycle of the received PWM signal does not vary in accordance with the preset pattern, the detector generates a signal indicating an abnormality.

8. The method according to claim 7, characterized in that The preset manner includes changing the duty cycle of the PWM signal according to a change period, wherein the change period is greater than a period of the PWM signal.

9. The method according to claim 8, characterized in that The variation period is n times the period of the PWM signal, where n is an integer.

10. The method according to claim 7, characterized in that The method further includes: taking safety measures when the duty cycle change of the received PWM signal is inconsistent with the preset mode.

11. A controller for high voltage interlock detection of a vehicle, comprising a memory and a processor, wherein the memory comprises instructions, and the processor is used to execute the instructions and implement the method according to any one of claims 7 to 10 in the process of executing the instructions.

12. A vehicle, comprising the high-voltage interlock detection system for a vehicle according to any one of claims 1 to 6, or configured to execute the method according to any one of claims 7 to 10, or comprising the controller according to claim 11.

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