Electric pump and electric pump interface compatibility method

Abstract

This application relates to an electric pump and an electric pump interface compatibility method. The electric pump includes a LIN interface circuit, an interface conversion circuit, and a control switch. One end of the control switch is connected to the LIN interface circuit, and the other end of the control switch is connected to the interface conversion circuit. When the control switch is closed, the LIN interface circuit is connected to the interface conversion circuit to form a PWM interface circuit. This application solves the problem that switching between electric pumps with different interfaces requires modifying the communication interface of the host computer, which reduces manufacturing and management efficiency, thereby improving manufacturing and management efficiency.

Description

Technical Field

[0001] This application relates to the field of electric pump technology, and in particular to an electric pump and an electric pump interface compatibility method. Background Technology

[0002] In automobiles, electric pumps are commonly used in motor cooling systems, thermal management systems, and battery systems. These systems involve electric pump speed control. Common speed control is achieved by a host computer controlling the electric pump speed through a communication interface between the host computer and the electric pump. These communication interfaces include Pulse Width Modulation (PWM) interfaces, Local Interconnect Networks (LIN) interfaces, and Controller Area Network (CAN) interfaces. For automotive parts, commonly used communication interfaces include PWM and LIN interfaces.

[0003] In related technologies, electric pumps only have a single PWM interface or LIN interface. If car manufacturers need to switch to electric pumps with different interfaces during the manufacturing and management process, they have to carry out modification operations, modifying the communication interface of the host computer to be compatible with the switched electric pump, which reduces the efficiency of manufacturing and management.

[0004] How to eliminate the need for modification of the communication interface of the host computer when switching between electric pumps with different interfaces, thereby improving manufacturing and management efficiency, is a technical problem that needs to be improved. Summary of the Invention

[0005] This application provides an electric pump and an electric pump interface compatibility method to at least solve the problem in related technologies that switching between electric pumps with different interfaces requires modifying the communication interface of the host computer, which reduces manufacturing and management efficiency.

[0006] In a first aspect, embodiments of this application provide an electric pump, which includes a LIN interface circuit, an interface conversion circuit, and a control switch. One end of the control switch is connected to the LIN interface circuit, and the other end of the control switch is connected to the interface conversion circuit. When the control switch is closed, the LIN interface circuit is connected to the interface conversion circuit to form a PWM interface circuit.

[0007] Secondly, embodiments of this application provide an electric pump interface compatibility method, applied to the electric pump, the method comprising:

[0008] If it is determined that the communication method between the electric pump and the host computer is not LIN communication, the control switch is closed and configured as the PWM interface circuit.

[0009] After the PWM interface circuit is configured, it is determined whether a PWM discrimination signal is received. If so, it is determined that the communication mode between the electric pump and the host computer is PWM communication mode.

[0010] Thirdly, this application provides another electric pump interface compatibility method, applied to the electric pump, the method comprising:

[0011] If it is determined that the communication method between the electric pump and the host computer is not PWM communication, the control switch is turned on and configured as the LIN interface circuit.

[0012] After the LIN interface circuit is configured, it is determined whether a LIN discrimination signal is received. If so, it is determined that the communication mode between the electric pump and the host computer is LIN communication mode.

[0013] Compared to related technologies, the electric pump provided in this application includes a LIN interface circuit, an interface conversion circuit, and a control switch. One end of the control switch is connected to the LIN interface circuit, and the other end of the control switch is connected to the interface conversion circuit. When the control switch is closed, the LIN interface circuit is connected to the interface conversion circuit to form a PWM interface circuit. This solves the problem that switching between electric pumps with different interfaces requires modifying the communication interface of the host computer, which reduces manufacturing and management efficiency, thereby improving manufacturing and management efficiency. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0015] Figure 1 This is a schematic diagram of the internal structure of an electric pump according to an embodiment of this application;

[0016] Figure 2 This is a schematic diagram of the internal structure of an electric pump according to another embodiment of this application;

[0017] Figure 3 This is a schematic diagram of the input and output terminals of the LIN interface circuit according to an embodiment of this application;

[0018] Figure 4 This is a schematic diagram of a LIN interface circuit according to an embodiment of this application;

[0019] Figure 5 This is a schematic diagram of an interface conversion circuit according to an embodiment of this application;

[0020] Figure 6This is a flowchart of an electric pump interface compatibility method according to an embodiment of this application;

[0021] Figure 7 This is a flowchart of an electric pump interface compatibility method according to another embodiment of this application;

[0022] Figure 8 This is a flowchart of an electric pump interface compatibility method according to another embodiment of this application. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0024] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0025] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0026] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "a," "an," "an," "the," and similar words used in this application do not indicate quantity limitation and may represent singular or plural. The terms "comprising," "including," "having," and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms "connected," "linked," "coupled," and similar words used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "And / or" describes the relationship between related objects, indicating that three relationships may exist; for example, "A and / or B" can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The terms “first,” “second,” “third,” etc., used in this application are merely to distinguish similar objects and do not represent a specific ordering of the objects.

[0027] This application provides an electric pump 10, which can be applied to products such as vehicle air conditioning systems and cooling systems that use water or oil as the circulating medium. Figure 1 This is a schematic diagram of the internal structure of the electric pump according to an embodiment of this application, as shown below. Figure 1 As shown, the electric pump 10 includes a LIN interface circuit 11, an interface conversion circuit 12, and a control switch 13. One end of the control switch 13 is connected to the LIN interface circuit 11, and the other end of the control switch 13 is connected to the interface conversion circuit 12. When the control switch 13 is closed, the LIN interface circuit 11 is connected to the interface conversion circuit 12 to form a PWM interface circuit.

[0028] Compared to related technologies, electric pumps only have a single PWM interface or LIN interface. If switching between electric pumps with different interfaces is required, the communication interface of the host computer must also be modified to be compatible with the switched electric pump, which reduces manufacturing and management efficiency. The electric pump 10 provided in this application includes a LIN interface circuit 11, an interface conversion circuit 12, and a control switch 13. One end of the control switch 13 is connected to the LIN interface circuit 11, and the other end of the control switch 13 is connected to the interface conversion circuit 12. When the control switch 13 is closed, the LIN interface circuit 11 is connected to the interface conversion circuit 12 to form a PWM interface circuit, realizing interface compatibility of the electric pump. This eliminates the need to manually modify the communication interface of the host computer, solving the problem of modifying the communication interface of the host computer when switching between electric pumps with different interfaces, which reduces manufacturing and management efficiency and is conducive to improving manufacturing and management efficiency.

[0029] It should be noted that, in order to save manufacturing costs, if the electric pump 10 does not need to have interface compatibility, for example, if it is clearly intended to be a PWM interface electric pump 10 product or a LIN interface electric pump 10 product, the electric pump 10 may not include one or more of the components in the control switch 13 and the interface conversion circuit 12. In this case, since the electric pump 10 includes the LIN interface circuit 11, the electric pump 10 is a LIN interface electric pump 10. Alternatively, the control switch 13 can be replaced with a wire. In this case, since the LIN interface circuit 11 is directly connected to the interface conversion circuit 12 to form a PWM interface circuit, the electric pump 10 is a PWM interface electric pump 10.

[0030] Optionally, the control switch 13 includes a transistor, which can serve as a control component for whether the control switch 13 is closed. When the transistor 21 is turned on, the control switch 13 is closed. Figure 2 This is a schematic diagram of the internal structure of an electric pump according to another embodiment of this application, as shown below. Figure 2 As shown, the emitter of the transistor 21 is connected to the LIN interface circuit 11, the collector of the transistor 21 is connected to the interface conversion circuit 12, and the base of the transistor 21 is connected to the input / output (I / O) interface. When the base of the transistor 21 is at a high level, the transistor 21 is turned on.

[0031] Furthermore, Figure 3 This is a schematic diagram of the input and output terminals of the LIN interface circuit according to an embodiment of this application, as shown below. Figure 3As shown, the electric pump 10 is used in the interaction system between the electric pump 10 and the host computer. The input terminal of the LIN interface circuit 11 is connected to the communication interface circuit 31 of the host computer, and the output terminal of the LIN interface circuit 11 is connected to the PWM function module 32 of the microcontroller unit (MCU) set in the electric pump 10.

[0032] For example, the LIN interface circuit 11 includes a transient suppression diode, a first resistor, and a capacitor. Figure 4 This is a schematic diagram of the LIN interface circuit according to an embodiment of this application, as shown below. Figure 4 As shown, the positive terminal of the transient suppression diode 41 is grounded, and the negative terminal of the transient suppression diode 41 is connected to the communication interface circuit 31 of the host computer. One end of the first resistor 42 is connected to the communication interface circuit 31 of the host computer, and the other end of the first resistor 42 is connected to the PWM function module 32 of the MCU. The first end of the capacitor 43 is connected to the PWM function module 32 of the MCU, and the first end of the capacitor 43 is also connected to the emitter of the transistor 21. The second end of the capacitor 43 is grounded. Current flows out from the communication interface circuit 31 of the host computer, is limited by the first resistor 42, filtered by the capacitor 43, and flows into the PWM function module 32 of the MCU. When the current flowing out from the communication interface circuit 31 of the host computer is large, the transient suppression diode 41 conducts to shunt the current, thereby protecting the circuit.

[0033] For example, interface conversion circuit 12 includes a second resistor and a diode. Figure 5 This is a schematic diagram of an interface conversion circuit according to an embodiment of this application, such as... Figure 5 As shown, one end of the second resistor 51 is connected to the collector of the transistor 21, and the other end of the second resistor 51 is connected to the cathode of the diode 52. The anode of the diode 52 is connected to the power supply voltage 53. When the transistor 21 is turned on, the current flows out from the power supply voltage 53, through the diode 52, and then through the second resistor 51 for current limiting, into the collector of the transistor 21, and out from the emitter of the transistor 21, entering the LIN interface circuit 11.

[0034] This application also provides an interface compatibility method for the electric pump 10, which is applied to the electric pump 10. Figure 6 This is a flowchart of an electric pump interface compatibility method according to an embodiment of this application, such as... Figure 6 As shown, the process includes the following steps:

[0035] Step S601: If it is determined that the communication method between the electric pump 10 and the host computer is not LIN communication, the control switch 13 is closed and configured as the PWM interface circuit. For electric pumps, the communication interface usually includes PWM interface and LIN interface. In this embodiment, it is determined whether the communication method between the electric pump 10 and the host computer is LIN communication. If it is not LIN communication, the control switch 13 is closed and configured as the PWM interface circuit.

[0036] Step S602: After the PWM interface circuit is configured, it is determined whether a PWM discrimination signal is received. If yes, it is determined that the communication mode between the electric pump 10 and the host computer is PWM communication mode. If no, it is determined that the communication mode between the electric pump 10 and the host computer is not PWM communication mode.

[0037] Through steps S601 to S602, this application sets up an interface conversion circuit 12 and a control switch 13. By controlling the control switch 13, compatibility between different interfaces of the electric pump 10 is achieved. Through the interface compatibility method of the electric pump 10 in this application, the switched electric pump 10 can automatically adjust the communication mode corresponding to the interface circuit to be consistent with the communication mode corresponding to the communication interface circuit 31 of the host computer. Therefore, it is not necessary to manually modify the communication interface of the host computer to be compatible with the switched electric pump 10, thereby improving the interface matching efficiency between the electric pump 10 and the host computer.

[0038] For example, Figure 7 This is a flowchart of an electric pump interface compatibility method according to another embodiment of this application, such as... Figure 7 As shown, the method includes the following steps:

[0039] Step S701: Configure the LIN interface circuit 11. For example, the MCU turns on the control switch 13 and configures the LIN interface circuit 11.

[0040] Step S702: Set the register to LIN mode. For example, the MCU sets the registers set in the MCU to LIN mode.

[0041] Step S703: Read signal data, for example, the MCU reads the signal data sent by the host computer;

[0042] Step S704: Determine whether a LIN discrimination signal has been received. Optionally, the MCU determines whether the received signal data conforms to the characteristics of a LIN signal. If yes, proceed to step S705; otherwise, proceed to step S708.

[0043] Step S705: If a LIN discrimination signal is received, determine that the communication mode between the electric pump 10 and the host computer is LIN communication mode;

[0044] Step S706: After determining that the communication mode between the electric pump 10 and the host computer is LIN communication mode, determine whether a handshake feature signal from the host computer has been received. The handshake feature signal can be set arbitrarily, for example, the handshake feature signal can be set to AA55AA55.

[0045] Step S707: If a handshake feature signal is received from the host computer, a signal indicating successful establishment of communication connection between the electric pump 10 and the host computer is generated, the process ends, and the drive or diagnostic function of the electric pump 10 is executed. If no handshake feature signal is received from the host computer, the connection fails, and the process ends.

[0046] Step S708: If no LIN discrimination signal is received, it is determined that the communication mode between the electric pump 10 and the host computer is not LIN communication mode, and the control switch 13 is closed to configure it as a PWM interface circuit.

[0047] Step S709: Set the register to PWM mode;

[0048] Step S710: Read signal data;

[0049] Step S711: Determine whether a PWM discrimination signal is received. Optionally, the MCU determines whether the received signal data conforms to the characteristics of a PWM signal. For example, the MCU determines whether the signal frequency of the received signal data is within the set frequency range. Optionally, the frequency range can be set to 50Hz to 150Hz.

[0050] Step S712: If a PWM discrimination signal is received, the communication mode between the electric pump 10 and the host computer is determined to be PWM communication mode. For example, if the signal frequency of the received signal data is within the set frequency range, the MCU determines that the communication mode between the electric pump 10 and the host computer is PWM communication mode.

[0051] Step S713: After determining that the communication mode between the electric pump 10 and the host computer is PWM communication mode, determine whether a handshake feature signal from the host computer is received. If a handshake feature signal from the host computer is received, generate a signal indicating that the communication connection between the electric pump 10 and the host computer has been successfully established, end the process, and execute the drive or diagnostic function of the electric pump 10. Optionally, determining whether a handshake feature signal from the host computer is received includes the MCU determining whether the duty cycle of the received signal data is the same as the preset value. If no handshake feature signal from the host computer is received, the communication connection between the electric pump 10 and the host computer fails to be established, and the process ends. For example, if the duty cycle of the received signal data is different from the preset value, the MCU determines that the communication connection between the electric pump 10 and the host computer fails to be established, and the process ends.

[0052] Step S714: If the received signal data does not conform to the characteristics of the PWM signal, a communication abnormality is determined. For example, if the signal frequency of the received signal data is not within the set frequency range, the MCU determines that the communication is abnormal and ends the process.

[0053] This application also provides an interface compatibility method for the electric pump 10, which is applied to the electric pump 10. Figure 8 This is a flowchart of an electric pump interface compatibility method according to another embodiment of this application, as follows: Figure 8 As shown, the process includes the following steps:

[0054] Step S801: If it is determined that the communication mode between the electric pump 10 and the host computer is not PWM communication mode, the control switch 13 is turned on and configured as the LIN interface circuit 11. For electric pumps, the communication interface usually includes PWM interface and LIN interface. In this embodiment, it is determined whether the communication mode between the electric pump 10 and the host computer is PWM communication mode. If it is not PWM communication mode, the control switch 13 is turned on and configured as the LIN interface circuit.

[0055] Step S802: After the LIN interface circuit 11 is configured, it is determined whether a LIN discrimination signal is received. If so, it is determined that the communication mode between the electric pump 10 and the host computer is LIN communication mode.

[0056] Through steps S801 to S802, this application sets up an interface conversion circuit 12 and a control switch 13. By controlling the control switch 13, compatibility between different interfaces of the electric pump 10 is achieved. Through the electric pump 10 interface compatibility method in this application, the switched electric pump 10 can automatically adjust the communication mode corresponding to the interface circuit of the electric pump 10 to be consistent with the communication mode corresponding to the communication interface circuit 31 of the host computer. Therefore, it is not necessary to manually modify the communication interface of the host computer to be compatible with the switched electric pump 10, thereby improving the interface matching efficiency between the electric pump 10 and the host computer. It should be noted that in different embodiments of the electric pump interface compatibility method in this application, the hardware circuits corresponding to each embodiment can be the same.

[0057] Those skilled in the art should understand that the technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An electric pump, characterized in that, The electric pump includes a LIN interface circuit, an interface conversion circuit, and a control switch. One end of the control switch is connected to the LIN interface circuit, and the other end of the control switch is connected to the interface conversion circuit. The interface conversion circuit includes a second resistor and a diode. One end of the second resistor is connected to the control switch, and the other end of the second resistor is connected to the negative terminal of the diode. The positive terminal of the diode is connected to the power supply voltage. When the control switch is closed, the LIN interface circuit is connected to the interface conversion circuit to form a PWM interface circuit.

2. The electric pump according to claim 1, characterized in that, The control switch includes a transistor, the emitter of which is connected to the LIN interface circuit, and the collector of which is connected to the interface conversion circuit. When the base of the transistor is at a high level, the transistor is turned on, controlling the control switch to close.

3. The electric pump according to claim 2, characterized in that, The electric pump is used in an interactive system with a host computer. The electric pump includes an MCU, which includes a PWM function module. The input terminal of the LIN interface circuit is connected to the communication interface circuit of the host computer, and the output terminal of the LIN interface circuit is connected to the PWM function module.

4. The electric pump according to claim 3, characterized in that, The LIN interface circuit includes a transient suppression diode, a first resistor, and a capacitor. The positive terminal of the transient suppression diode is grounded, and the negative terminal of the transient suppression diode is connected to the communication interface circuit of the host computer. One end of the first resistor is connected to the communication interface circuit of the host computer, and the other end of the first resistor is connected to the PWM function module. The first end of the capacitor is connected to both the PWM function module and the emitter of the transistor, and the second end of the capacitor is grounded.

5. The electric pump according to claim 3, characterized in that, One end of the second resistor is connected to the collector of the transistor.

6. A method for ensuring compatibility of electric pump interfaces, characterized in that, The method, applied to an electric pump as described in any one of claims 1 to 5, comprises: If it is determined that the communication method between the electric pump and the host computer is not LIN communication, the control switch is closed and configured as the PWM interface circuit. After the PWM interface circuit is configured, it is determined whether a PWM discrimination signal is received. If so, it is determined that the communication mode between the electric pump and the host computer is PWM communication mode.

7. The method according to claim 6, characterized in that, The step of determining whether a PWM discrimination signal has been received includes: determining whether the frequency of the received signal data is within a preset range; if so, determining that the communication mode between the electric pump and the host computer is PWM communication mode.

8. The method according to claim 6, characterized in that, If the communication mode between the electric pump and the host computer is determined to be PWM communication mode, it is determined whether a handshake feature signal is received from the host computer. If so, a signal indicating that the communication connection between the electric pump and the host computer has been successfully established is generated.

9. The method according to claim 8, characterized in that, The step of determining whether a handshake feature signal from the host computer has been received includes determining whether the duty cycle of the received signal data is a preset value. If so, a signal indicating that the communication connection between the electric pump and the host computer has been successfully established is generated.

10. A method for ensuring compatibility of electric pump interfaces, characterized in that, The method, applied to an electric pump as described in any one of claims 1 to 5, comprises: If it is determined that the communication method between the electric pump and the host computer is not PWM communication, the control switch is turned on and configured as the LIN interface circuit. After the LIN interface circuit is configured, it is determined whether a LIN discrimination signal is received. If so, it is determined that the communication mode between the electric pump and the host computer is LIN communication mode.

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