Lin bus oil pump control circuit compatible with start-stop signal

Abstract

The utility model discloses a kind of LIN bus oil pump control circuit compatible with start-stop signal, it is related to vehicle-mounted oil pump control technical field, including start-stop control circuit, the start-stop control circuit is used to generate oil pump start-stop signal;Start-stop signal regulating circuit, the start-stop signal regulating circuit with the start-stop control circuit electric connection, the start-stop signal regulating circuit is used to carry out electric signal processing to start-stop signal;LIN bus circuit;LIN bus control circuit;Compatible regulation and control circuit.The utility model is equipped with start-stop signal regulating circuit, LIN bus control circuit and compatible regulation and control circuit in oil pump control circuit, realize the compatibility problem between 24V start-stop signal and 12V LIN bus is solved, while guarantee the reliability and stability of circuit.It can be remotely controlled by LIN bus, read oil pump state, provide the convenience of fault detection and maintenance, and have protection mechanism, prevent circuit from being damaged under high voltage or reverse connection.

Description

Technical Field

[0001] This utility model relates to the field of vehicle-mounted oil pump control technology, and in particular to a LIN bus oil pump control circuit compatible with start-stop signals. Background Technology

[0002] In traditional commercial vehicle fuel pump control, start / stop signals are typically 24V, while the LIN bus (Local Interconnect Network) communication protocol usually operates within a standard voltage range of 8V~18V. Therefore, attempting to control a commercial vehicle fuel pump with 24V start / stop signals compatible with a 12V LIN bus would result in level incompatibility between the two. Excessive voltage could damage components or even burn out the circuitry, increasing design complexity and requiring additional level conversion circuitry. Utility Model Content

[0003] The purpose of this invention is to address the incompatibility between the 24V start / stop signal for commercial vehicle fuel pump control and the 12V LIN bus in existing technologies, and to propose a LIN bus fuel pump control circuit that is compatible with start / stop signals.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This utility model provides a LIN bus oil pump control circuit compatible with start / stop signals, including:

[0006] A start-stop control circuit, which generates oil pump start-stop signals;

[0007] A start / stop signal conditioning circuit is electrically connected to the start / stop control circuit, and the start / stop signal conditioning circuit is used to perform electrical signal processing on the start / stop signal;

[0008] LIN bus circuit, which is used for communication control of the oil pump;

[0009] A LIN bus control circuit is electrically connected to the LIN bus circuit, and the LIN bus control circuit is used to provide current limiting protection for the electrical signals in the LIN bus circuit.

[0010] A compatible control circuit is provided, which is electrically connected to both the start / stop control circuit and the LIN bus circuit. The compatible control circuit is used to perform compatible control and matching of the start / stop signal and the LIN bus.

[0011] In one feasible embodiment, the start / stop control circuit includes:

[0012] The microcontroller MCU is used to generate a 24V start / stop signal by reading the AD interface MCU_ON / OFF.

[0013] Reverse connection protection diode D3 is used to control the power supply connection position;

[0014] Resistor R5 is electrically connected to the microcontroller MCU and is used to divide the 24V start / stop signal voltage.

[0015] Resistor R12 is electrically connected to the microcontroller MCU and is used to divide the 24V start / stop signal voltage.

[0016] In one feasible solution, the start / stop signal adjustment circuit includes:

[0017] The filter resistor R13 is used to filter out high-frequency noise in the start / stop signal;

[0018] The filter capacitor C1 is used to perform capacitive filtering on the start / stop signal.

[0019] In one feasible solution, the LIN bus circuit includes:

[0020] The LIN bus access terminal MCU_LIN is electrically connected to the peripheral circuit Q1 and is used for communication control of the oil pump.

[0021] Resistor R3 is electrically connected to peripheral circuit Q1 and is used to control the operating state of peripheral circuit Q1.

[0022] Resistor R2 is electrically connected to peripheral circuit Q1 and is used to control the working state of peripheral circuit Q1.

[0023] Resistor R11 is electrically connected to the LIN bus access terminal MCU_LIN, and resistor R11 is the receiving resistor of the LIN bus access terminal MCU_LIN.

[0024] In one feasible solution, the compatible control circuit includes:

[0025] NMOS transistor M1 is electrically connected to the start / stop signal conditioning circuit and the LIN bus control circuit respectively. NMOS transistor M1 is used to convert the start / stop signal into the voltage required by the LIN bus.

[0026] The protection diode D1 is electrically connected to the start / stop control circuit, the start / stop signal conditioning circuit, the LIN bus circuit, and the LIN bus control circuit.

[0027] In one feasible embodiment, the protection diode D1 includes a TVS protection diode.

[0028] In one feasible solution, the LIN bus control circuit includes:

[0029] Resistor R1 is electrically connected to the LIN bus access terminal MCU_LIN and NMOS transistor M1.

[0030] The beneficial effects of this utility model are as follows:

[0031] This invention solves the compatibility problem between the 24V start / stop signal and the 12V LIN bus by incorporating a start / stop signal adjustment circuit, a LIN bus control circuit, and a compatible regulation circuit into the oil pump control circuit, while ensuring the reliability and stability of the circuit. It enables remote control and reading of the oil pump status via the LIN bus, providing convenience for fault detection and maintenance, and has a protection mechanism to prevent damage to the circuit under high voltage or reverse connection conditions. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a LIN bus oil pump control circuit structure that is compatible with start / stop signals, provided in an embodiment of this utility model. Detailed Implementation

[0033] 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.

[0034] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] Example

[0038] Reference Figure 1 In this embodiment, to address the safety risks associated with equipment or personnel contacting tunnel walls during tunnel inspections, this invention provides a LIN bus-based oil pump control circuit compatible with start / stop signals. This circuit, equipped with a start / stop signal adjustment circuit, a LIN bus control circuit, and a compatible control circuit, resolves the compatibility issue between 24V start / stop signals and a 12V LIN bus, while ensuring circuit reliability and stability. It enables remote control and status monitoring of the oil pump via the LIN bus, facilitating fault detection and maintenance, and includes a protection mechanism to prevent damage under high voltage or reverse connection conditions.

[0039] Specifically, a LIN bus-based oil pump control circuit compatible with start / stop signals includes: a start / stop control circuit, a start / stop signal adjustment circuit, a LIN bus circuit, and a LIN bus control circuit, as well as a compatibility control circuit. The start / stop control circuit generates oil pump start / stop signals, controlling the oil pump to stop and start. The start / stop signal adjustment circuit is electrically connected to the start / stop control circuit and processes the start / stop signals to meet the compatibility requirements of the start / stop signals and the LIN bus. The LIN bus circuit is used for communication control of the oil pump, enabling communication-based regulation of the pump. The LIN bus control circuit is electrically connected to the LIN bus circuit and provides current-limiting protection for the electrical signals in the LIN bus circuit to meet the compatibility requirements of the start / stop signals and the LIN bus. The compatibility control circuit is electrically connected to both the start / stop control circuit and the LIN bus circuit, and performs compatibility regulation and matching between the start / stop signals and the LIN bus. In this embodiment, compatibility between the start / stop signals and the LIN bus can be achieved by voltage division and current limiting of the start / stop signals. In addition, it should be noted that in order for the oil pump control circuit to work properly, the oil pump control circuit also includes: a positive power supply, a power supply V1 and a power supply V3, wherein the power supply V1 and the power supply V3 are both 12V power supplies.

[0040] Specifically, the start / stop control circuit includes: a microcontroller (MCU), a reverse connection protection diode D3, resistors R5 and R12. The MCU generates a 24V start / stop signal by reading the MCU_ON / OFF interface from the AD interface. The reverse connection protection diode D3 controls the power supply connection position, preventing damage to the circuit if the power supply is connected incorrectly. If the power supply is reversed, D3 will conduct, protecting the circuit from damage. Resistor R5 is electrically connected to the MCU and is used to divide the 24V start / stop signal voltage. Resistor R12 is also electrically connected to the MCU and is used to divide the 24V start / stop signal voltage. In other words, resistors R5 and R12 divide the 24V start / stop signal voltage (24V level). They convert the 24V start / stop signal into a voltage range suitable for the MCU to read, allowing the MCU to correctly determine the state of the start / stop signal. Specifically, the microcontroller (MCU) reads this signal through the AD interface. When it reads a voltage between 18V and 36V, the MCU considers it a start signal; when it reads a voltage less than 18V or greater than 36V, it is a stop signal.

[0041] In this embodiment, to facilitate understanding of how the start / stop signal is adjusted, the start / stop signal adjustment circuit includes a filter resistor R13 and a filter capacitor C1. The filter resistor R13 is used to filter out high-frequency noise in the start / stop signal; the filter capacitor C1 is used for capacitive filtering of the start / stop signal. That is, in this embodiment, the filter capacitor C1 and the filter resistor R13 work together. The filter resistor R13 is used to filter out high-frequency noise in the signal, ensuring a more stable start / stop signal, while the filter capacitor C1 ensures the stability of the 24V start / stop signal. This smooths out fluctuations in the start / stop signal, preventing the microcontroller (MCU) from reading incorrect signals due to power supply noise or instantaneous current fluctuations.

[0042] In this embodiment, the LIN bus circuit includes: a LIN bus access terminal MCU_LIN, resistors R3, R2, and R11. The LIN bus access terminal MCU_LIN is electrically connected to the peripheral circuit Q1. This LIN bus access terminal is used for communication control of the oil pump, enabling the transmission of oil pump status information, such as motor speed, current, overvoltage, and undervoltage fault information, via the LIN bus for rapid diagnosis and maintenance. Resistor R3 is electrically connected to the peripheral circuit Q1 and is used to control the operating state of the peripheral circuit Q1. Resistor R2 is also electrically connected to the peripheral circuit Q1 and is used to control the operating state of the peripheral circuit Q1. Resistor R11 is electrically connected to the LIN bus access terminal MCU_LIN and serves as the receiving resistor for the LIN bus access terminal MCU_LIN. Resistor R11 is used to transmit signals from the LIN bus to the microcontroller MCU for processing. The resistance value of resistor R11 ensures that the microcontroller MCU can accurately read and respond to signals on the LIN bus. In this embodiment, resistors R2 and R3 work together to control the on / off state of the peripheral circuit Q1 and simultaneously limit current. This helps to set the operating state of the peripheral circuit Q1, ensuring that it drives the LIN bus normally without burning out components due to excessive current. Resistors R2 and R3 ensure that the peripheral circuit Q1 has appropriate current protection during operation.

[0043] In this embodiment, to facilitate understanding of how the compatibility control circuit performs compatibility, the compatibility control circuit includes an NMOS transistor M1 and a protection diode D1. The NMOS transistor M1 is electrically connected to both the start / stop signal conditioning circuit and the LIN bus control circuit. The NMOS transistor M1 is used to convert the start / stop signal into the voltage required by the LIN bus. The protection diode D1 is electrically connected to the start / stop control circuit, the start / stop signal conditioning circuit, the LIN bus circuit, and the LIN bus control circuit. The protection diode D1 limits voltage peaks to prevent high voltage from damaging other electronic components, thus protecting the oil pump control circuit from electrostatic discharge (ESD) and surge voltage. Specifically, the NMOS transistor M1 is responsible for converting the 24V start / stop signal into the voltage (12V) required by the LIN bus. The NMOS transistor M1 ensures that the circuit operates within the normal voltage range by controlling the current flow. Furthermore, the NMOS transistor M1 is electrically connected to resistors R2 and R3, which ensure appropriate current protection for the NMOS transistor M1 during operation. It should be noted that the protection diode D1 includes a TVS protection diode.

[0044] In this embodiment, the LIN bus control circuit includes a resistor R1, which is electrically connected to the LIN bus access terminal MCU_LIN and the NMOS transistor M1. Resistor R1 is used to maintain the LIN bus at a high level when there is no drive signal (i.e., resistor R1 is a pull-up resistor). Additionally, resistor R1, with an appropriate resistance value, prevents the NMOS transistor M1 from being falsely triggered. Resistor R1 controls the level stability of the LIN bus, preventing abnormal LIN bus levels.

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A LIN bus-based oil pump control circuit compatible with start / stop signals, characterized in that, include: A start-stop control circuit, which generates oil pump start-stop signals; A start / stop signal conditioning circuit is electrically connected to the start / stop control circuit, and the start / stop signal conditioning circuit is used to perform electrical signal processing on the start / stop signal; LIN bus circuit, which is used for communication control of the oil pump; A LIN bus control circuit is electrically connected to the LIN bus circuit, and the LIN bus control circuit is used to provide current limiting protection for the electrical signals in the LIN bus circuit. A compatible control circuit is provided, which is electrically connected to both the start / stop control circuit and the LIN bus circuit. The compatible control circuit is used to perform compatible control and matching of the start / stop signal and the LIN bus.

2. The LIN bus oil pump control circuit compatible with start / stop signals according to claim 1, characterized in that, The start / stop control circuit includes: The microcontroller MCU is used to generate a 24V start / stop signal by reading the AD interface MCU_ON / OFF. Reverse connection protection diode D3 is used to control the power supply connection position; Resistor R5 is electrically connected to the microcontroller MCU and is used to divide the 24V start / stop signal voltage. Resistor R12 is electrically connected to the microcontroller MCU and is used to divide the 24V start / stop signal voltage.

3. The LIN bus oil pump control circuit compatible with start / stop signals according to claim 2, characterized in that, The start / stop signal adjustment circuit includes: The filter resistor R13 is used to filter out high-frequency noise in the start / stop signal; The filter capacitor C1 is used to perform capacitive filtering on the start / stop signal.

4. The LIN bus oil pump control circuit compatible with start / stop signals according to claim 1, characterized in that, The LIN bus circuit includes: The LIN bus access terminal MCU_LIN is electrically connected to the peripheral circuit Q1 and is used for communication control of the oil pump. Resistor R3 is electrically connected to peripheral circuit Q1 and is used to control the operating state of peripheral circuit Q1. Resistor R2 is electrically connected to peripheral circuit Q1 and is used to control the working state of peripheral circuit Q1. Resistor R11 is electrically connected to the LIN bus access terminal MCU_LIN, and resistor R11 is the receiving resistor of the LIN bus access terminal MCU_LIN.

5. A LIN bus oil pump control circuit compatible with start / stop signals according to claim 4, characterized in that, The compatible control circuit includes: NMOS transistor M1 is electrically connected to the start / stop signal conditioning circuit and the LIN bus control circuit respectively. NMOS transistor M1 is used to convert the start / stop signal into the voltage required by the LIN bus. The protection diode D1 is electrically connected to the start / stop control circuit, the start / stop signal conditioning circuit, the LIN bus circuit, and the LIN bus control circuit.

6. A LIN bus oil pump control circuit compatible with start / stop signals according to claim 5, characterized in that, The protection diode D1 includes a TVS protection diode.

7. A LIN bus oil pump control circuit compatible with start / stop signals according to claim 5 or 6, characterized in that, The LIN bus control circuit includes: Resistor R1 is electrically connected to the LIN bus access terminal MCU_LIN and NMOS transistor M1.

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