A cooling water pump offline upgrade circuit

By designing an offline upgrade circuit for the cooling water pump that includes components such as TVS diodes, filter capacitors, and NPN transistors, the upgrade difficulty caused by the lack of a LIN transceiver in the MCU chip was solved. Direct software upgrades and multiple communication methods were enabled on the vehicle, improving repair and maintenance efficiency.

CN119596783BActive Publication Date: 2025-09-30BOZU TECH (SUZHOU) CO LTD
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Patent Information

Application Number
CN202411731212.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-29
Publication Date
2025-09-30
Estimated Expiration
2044-11-29

AI Technical Summary

Technical Problem

In the existing technology, the lack of an MCU chip with an integrated LIN transceiver means that the cooling water pump cannot upgrade its software offline via the signal line. It must be disassembled and reinstalled into the car, making the upgrade process time-consuming, labor-intensive and inefficient.

Method used

A cooling water pump offline upgrade circuit was designed, which realizes LIN communication function through signal lines and peripheral components. The circuit consists of a TVS diode, filter capacitor, pull-up resistor, current-limiting resistor and NPN transistor, allowing software upgrades to be performed directly on the car.

Benefits of technology

It enables software upgrades without disassembling the cooling water pump, improving the convenience of repair and maintenance, and supports LIN and PWM input and output communications, improving work efficiency.

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Abstract

The present invention relates to the technical field of radiator water pump controllers, and specifically to an offline upgrade circuit for a radiator water pump, comprising: a radiator water pump power and signal line terminal J1, whose positive pins are respectively connected to the VBAT pin and whose negative pins are both grounded; an external offline upgrade software module J2; and an MCU microcontroller U1; wherein the radiator water pump power and signal line terminal J1 and the external offline upgrade software module J2 are connected to a TVS diode TV1, a filter capacitor C2, a pull-up resistor R4, a 0Ω jumper resistor R7, and a current-limiting resistor R5 via interconnected signal lines. The present invention utilizes a single signal line and peripheral components to enable automotive radiator water pumps to support LIN communication functions, thereby resolving the issue on the market where, due to price and other factors, some MCU chips lack internal LIN transceivers, resulting in a time-consuming, labor-intensive, and inefficient upgrade process.
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Description

Technical Field

[0001] The present invention relates to the technical field of cooling water pump controllers, in particular to an offline upgrading circuit for a cooling water pump. Background Art

[0002] The automotive cooling water pump controller is a key component in modern vehicle cooling systems, primarily responsible for controlling the water pump's operation and ensuring the engine operates within the optimal temperature range. Its primary function is to improve engine efficiency and lifespan, optimize fuel economy, and provide a more reliable and comfortable driving experience for the driver through precise temperature monitoring and intelligent speed regulation.

[0003] Currently, due to price and other reasons, there are MCU chips on the market that do not have an integrated LIN transceiver. Without an integrated LIN transceiver inside the MCU, the software cannot be upgraded offline through the signal line. Therefore, the cooling water pump must be disassembled from the car, the board-side software upgrade must be performed, and finally the cooling water pump must be reinstalled in the car for use. The entire upgrade process is time-consuming, labor-intensive, and inefficient. Therefore, we propose a cooling water pump offline upgrade circuit. Summary of the Invention

[0004] The object of the present invention is to provide an offline upgrade circuit for a radiator water pump, which has the advantage of supporting LIN communication function of the radiator water pump of an automobile through a single signal line and peripheral components. The circuit solves the problem that, due to price and other reasons, there are MCU chips on the market that do not have an integrated LIN transceiver. If the MCU does not have an integrated LIN transceiver, the software cannot be upgraded offline via the signal line. Therefore, the radiator water pump must be disassembled from the automobile, the board-side software upgrade must be performed, and finally the radiator water pump must be reinstalled in the automobile for use. The entire upgrade process is time-consuming, labor-intensive, and inefficient.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a heat dissipation water pump offline upgrade circuit, characterized in that it includes:

[0006] The positive pins of the cooling water pump power supply and signal line terminal J1 are connected to the VBAT pin and the negative pins are grounded, and the external offline upgrade software module J2 and the MCU microcontroller U1;

[0007] Among them, the cooling water pump power supply and signal line terminal J1 and the external offline upgrade software module J2 are connected to the TVS diode TV1, the filter capacitor C2, the pull-up resistor R4, the 0Ω jumper resistor R7 and the current limiting resistor R5 through interconnected signal lines, and one end of the TVS diode TV1 and the filter capacitor C2 are grounded, one end of the current limiting resistor R5 is connected to the pull-down resistor R8 and the base of the NPN transistor Q2, the emitter of the NPN transistor Q2 is grounded, and the collector of the NPN transistor Q2 is connected to the pull-up resistor R2 and a current-limiting resistor R3, one end of the current-limiting resistor R3 is connected to a pull-down resistor R6, a LIN communication line matching capacitor C1, and a base of an NPN transistor Q1, the emitter of the NPN transistor Q1 is grounded, the collector of the NPN transistor Q1 is connected to the pull-up resistor R1, the current-limiting resistor R16, and the current-limiting resistor R17, one end of the current-limiting resistor R16 is connected to the RXD terminal of the MCU microcontroller U1, and one end of each of the pull-up resistor R2 and the pull-up resistor R1 is connected to the output terminal of the MCU microcontroller U1;

[0008] The TXD end of the MCU microcontroller U1 is connected to the current limiting resistor R11, one end of the current limiting resistor R11 is connected to the current limiting resistor R13, the pull-down resistor R14 and the base of the NPN transistor Q4, one end of the pull-down resistor R14 is grounded, the emitter of the NPN transistor Q4 is grounded, the collector of the NPN transistor Q4 is connected to the pull-up resistor R9 and the current limiting resistor R10, one end of the pull-up resistor R9 is connected to the output end of the MCU microcontroller U1, one end of the current limiting resistor R10 is connected to the pull-down resistor R12 and the collector of the NPN transistor Q5 and the base of the NPN transistor Q3, one end of the pull-down resistor R12 is grounded, and the collector of the NPN transistor Q3 is connected to one end of the 0Ω jumper resistor R7.

[0009] Preferably, the voltage of the VBAT pin is 12V and is compatible with the LIN communication level.

[0010] Preferably, the output voltage of the MCU microcontroller U1 is 5V.

[0011] Preferably, the MCU microcontroller U1 adopts serial port communication.

[0012] Preferably, the MCU microcontroller U1 is an MCU chip without an internal integrated LIN transceiver.

[0013] Preferably, the IO port 1 end of the MCU microcontroller U1 is connected to one end of the current limiting resistor R13.

[0014] Preferably, the IO port 2 end of the MCU microcontroller U1 is connected to one end of the current limiting resistor R17.

[0015] Preferably, the emitter of the NPN transistor Q3 is connected to the current sampling resistor R15 and the base of the NPN transistor Q5, and one end of the current sampling resistor R15 and the emitter of the NPN transistor Q5 are both grounded.

[0016] Preferably, the VBE voltage value of the NPN transistor Q5 is between 0.6V and 0.7V.

[0017] Preferably, one end of the pull-up resistor R4 is connected to the output end of the reverse isolation diode D1 , and the input end of the reverse isolation diode D1 is connected to the VBAT pin.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In the design of the automobile radiator water pump drive circuit, the present invention can make the chip support LIN communication for the MCU chip on the market that does not have an integrated LIN transceiver, that is, the radiator water pump offline software upgrade provides great convenience for the subsequent radiator water pump repair, maintenance and detection.

[0020] 2. The automobile cooling water pump of the present invention supports three communication modes at the same time, namely LIN communication, PWM input communication and PWM output communication.

[0021] 3. The present invention has the function of protecting the NPN transistor Q3 component. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a circuit diagram of the present invention. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Example 1

[0025] See also Figure 1As shown, the present invention provides a technical solution: a cooling water pump offline upgrade circuit, comprising: a cooling water pump power supply and signal line terminal J1, whose positive pins are respectively connected to the VBAT pins and whose negative pins are both grounded, an external offline upgrade software module J2, and an MCU microcontroller U1, wherein the voltage of the VBAT pin is 12V and is compatible with the LIN communication level, the output voltage of the MCU microcontroller U1 is 5V, the MCU microcontroller U1 adopts serial port communication, the MCU microcontroller U1 is an MCU chip without an integrated LIN transceiver, the cooling water pump power supply and signal line terminal J1 and the external The offline upgrade software module J2 is connected to the TVS diode TV1, the filter capacitor C2, the pull-up resistor R4, the 0Ω jumper resistor R7 and the current limiting resistor R5 through interconnected signal lines, and one end of the TVS diode TV1 and the filter capacitor C2 are grounded, one end of the pull-up resistor R4 is connected to the output end of the reverse isolation diode D1, the input end of the reverse isolation diode D1 is connected to the VBAT pin, one end of the current limiting resistor R5 is connected to the pull-down resistor R8 and the base of the NPN transistor Q2, the emitter of the NPN transistor Q2 is grounded, and the collector of the NPN transistor Q2 is connected to the pull-up resistor R2 and The current limiting resistor R3 is connected, one end of the current limiting resistor R3 is connected to the pull-down resistor R6, the LIN communication line matching capacitor C1 and the base of the NPN transistor Q1, the emitter of the NPN transistor Q1 is grounded, the collector of the NPN transistor Q1 is connected to the pull-up resistor R1, the current limiting resistor R16 and the current limiting resistor R17, one end of the current limiting resistor R16 is connected to the RXD end of the MCU microcontroller U1, one end of the pull-up resistor R2 and the pull-up resistor R1 are both connected to the output end of the MCU microcontroller U1, the TXD end of the MCU microcontroller U1 is connected to the current limiting resistor R11, and the current limiting resistor R11 is connected to the RXD end of the MCU microcontroller U1. One end is connected to the current limiting resistor R13, the pull-down resistor R14 and the base of the NPN transistor Q4, one end of the pull-down resistor R14 is grounded, the emitter of the NPN transistor Q4 is grounded, the collector of the NPN transistor Q4 is connected to the pull-up resistor R9 and the current limiting resistor R10, one end of the pull-up resistor R9 is connected to the output end of the MCU microcontroller U1, one end of the current limiting resistor R10 is connected to the pull-down resistor R12 and the collector of the NPN transistor Q5 and the base of the NPN transistor Q3, one end of the pull-down resistor R12 is grounded, and the collector of the NPN transistor Q3 is connected to one end of the 0Ω jumper resistor R7.

[0026] This technical solution: By setting the reverse isolation diode D1, it can prevent the external host computer from supplying power to the cooling water pump. By setting the TVS diode TV1, it plays an anti-static and anti-surge protection role. When the cooling water pump needs to use the LIN communication (cooling water pump offline upgrade software) function, under the premise that the cooling water pump has been installed on the car, the cooling water pump power and signal line terminal J1 and the external offline upgrade software module J2 are connected as follows Figure 1After the connection is completed as shown, when the MCU microcontroller U1 wants to receive the LIN signal sent by the LIN signal line in the module of the external offline upgrade software module J2, the LIN signal is sent to the RXD pin of the MCU microcontroller U1 through the filter capacitor C2, current limiting resistor R5, pull-down resistor R8, NPN transistor Q2, pull-up resistor R2, current limiting resistor R3, pull-down resistor R6, LIN communication line matching capacitor C1, NPN transistor Q1, pull-up resistor R1, current limiting resistor R16 components and lines, so that the MCU microcontroller U1 receives the LIN signal sent by the module of the external offline upgrade software module J2. When the MCU micro When the controller U1 wants to send a LIN signal to the external offline upgrade software module J2, the LIN signal is sent through the TXD of the MCU microcontroller U1, and is given to the current limiting resistor R11, pull-down resistor R14, NPN transistor Q4, pull-up resistor R9, current limiting resistor R10, pull-down resistor R12, NPN transistor Q3, 0Ω jumper resistor R7 components and lines to send the LIN signal to the LIN signal line in the external offline upgrade software module J2, thereby achieving the purpose of offline upgrading the cooling water pump software without disassembling the cooling water pump in the car, which provides great convenience for the later repair, maintenance and inspection of the cooling water pump.

[0027] Example 2

[0028] Based on the first embodiment, the present invention is as follows Figure 1 As shown, it is disclosed that the IO port 2 end of the MCU microcontroller U1 is connected to one end of the current limiting resistor R17.

[0029] This technical solution: When the cooling water pump requires the host computer to use a PWM input signal to regulate its speed, the signal line of the external host computer is connected to the signal line of the cooling water pump power supply and signal line terminal J1, and the PWM input signal of the external host computer is sent to the IO port 2 of the MCU microcontroller U1 through the filter capacitor C2, current limiting resistor R5, pull-down resistor R8, NPN transistor Q2, pull-up resistor R2, current limiting resistor R3, pull-down resistor R6, LIN communication line matching capacitor C1, NPN transistor Q1, pull-up resistor R1, current limiting resistor R17 components and lines, so that the MCU microcontroller U1 receives the PWM input signal sent by the host computer, and the cooling water pump is speed-regulated according to the input PWM signal.

[0030] Example 3

[0031] Based on the first embodiment, the present invention is as follows Figure 1 As shown, it is disclosed that the IO port 1 end of the MCU microcontroller U1 is connected to one end of the current limiting resistor R13.

[0032] This technical solution: When the external host computer needs the PWM output feedback signal of this cooling water pump, this cooling water pump will send the PWM output feedback signal of the cooling water pump to the current limiting resistor R13, pull-down resistor R14, NPN transistor Q4, pull-up resistor R9, current limiting resistor R10, pull-down resistor R12, NPN transistor Q3, 0Ω jumper resistor R7 components and lines through the IO port 1 of the MCU microcontroller U1 to send the PWM output feedback signal to the signal line of the external host computer. The external host computer will know the current working status of the cooling water pump based on the received signal.

[0033] Example 4

[0034] Based on the first embodiment, the present invention is as follows Figure 1 As shown, the emitter of the NPN transistor Q3 is connected to the current sampling resistor R15 and the base of the NPN transistor Q5, one end of the current sampling resistor R15 and the emitter of the NPN transistor Q5 are both grounded, and the VBE voltage value of the NPN transistor Q5 is between 0.6V and 0.7V.

[0035] This technical solution: When the signal line of the cooling water pump needs to be short-connected to the positive pole of the power supply for testing, when the current flowing through the current sampling resistor R15 is too large, the VBE of the NPN transistor Q5 reaches the conduction condition of 0.6V to 0.7V, and the NPN transistor Q5 is turned on. At this time, the VBE of the NPN transistor Q3 is close to 0V, and the NPN transistor Q3 is turned off, so that the current cannot flow into the NPN transistor Q3, thereby achieving the purpose of protecting the NPN transistor Q3.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A cooling water pump offline upgrade circuit, characterized in that: include: The positive pins of the cooling water pump power and signal line terminal J1 are connected to the VBAT pin and the negative pins are grounded, and the external offline upgrade software module J2 and the MCU microcontroller U1; Among them, the cooling water pump power supply and signal line terminal J1 and the external offline upgrade software module J2 are connected to the TVS diode TV1, the filter capacitor C2, the pull-up resistor R4, the 0Ω jumper resistor R7 and the current limiting resistor R5 through interconnected signal lines, and one end of the TVS diode TV1 and the filter capacitor C2 are grounded, one end of the current limiting resistor R5 is connected to the pull-down resistor R8 and the base of the NPN transistor Q2, the emitter of the NPN transistor Q2 is grounded, and the collector of the NPN transistor Q2 is connected to the pull-up resistor R2 and a current-limiting resistor R3, one end of the current-limiting resistor R3 is connected to a pull-down resistor R6, a LIN communication line matching capacitor C1, and a base of an NPN transistor Q1, the emitter of the NPN transistor Q1 is grounded, the collector of the NPN transistor Q1 is connected to the pull-up resistor R1, the current-limiting resistor R16, and the current-limiting resistor R17, one end of the current-limiting resistor R16 is connected to the RXD terminal of the MCU microcontroller U1, and one end of each of the pull-up resistor R2 and the pull-up resistor R1 is connected to the output terminal of the MCU microcontroller U1; The TXD end of the MCU microcontroller U1 is connected to the current limiting resistor R11, one end of the current limiting resistor R11 is connected to the current limiting resistor R13, the pull-down resistor R14 and the base of the NPN transistor Q4, one end of the pull-down resistor R14 is grounded, the emitter of the NPN transistor Q4 is grounded, the collector of the NPN transistor Q4 is connected to the pull-up resistor R9 and the current limiting resistor R10, one end of the pull-up resistor R9 is connected to the output end of the MCU microcontroller U1, one end of the current limiting resistor R10 is connected to the pull-down resistor R12 and the collector of the NPN transistor Q5 and the base of the NPN transistor Q3, one end of the pull-down resistor R12 is grounded, and the collector of the NPN transistor Q3 is connected to one end of the 0Ω jumper resistor R7.

2. The offline upgrade circuit for a heat dissipation water pump according to claim 1, characterized in that: The voltage of the VBAT pin is 12V and is compatible with the LIN communication level.

3. The offline upgrade circuit for a heat dissipation water pump according to claim 1, characterized in that: The output voltage of the MCU microcontroller U1 is 5V.

4. The offline upgrade circuit for a heat dissipation water pump according to claim 1, characterized in that: The MCU microcontroller U1 uses serial port communication.

5. The offline upgrade circuit for a heat dissipation water pump according to claim 1, characterized in that: The MCU microcontroller U1 is an MCU chip without an internal integrated LIN transceiver.

6. The offline upgrade circuit for a heat dissipation water pump according to claim 1, characterized in that: The IO port 1 of the MCU microcontroller U1 is connected to one end of the current limiting resistor R13.

7. The offline upgrade circuit for a heat dissipation water pump according to claim 1, characterized in that: The IO port 2 of the MCU microcontroller U1 is connected to one end of the current limiting resistor R17.

8. The offline upgrade circuit for a heat dissipation water pump according to claim 1, characterized in that: The emitter of the NPN transistor Q3 is connected to the current sampling resistor R15 and the base of the NPN transistor Q5. One end of the current sampling resistor R15 and the emitter of the NPN transistor Q5 are both grounded.

9. The offline upgrade circuit for a heat dissipation water pump according to claim 1, characterized in that: The VBE voltage value of the NPN transistor Q5 is between 0.6V and 0.7V.

10. The offline upgrade circuit for a heat dissipation water pump according to claim 1, characterized in that: One end of the pull-up resistor R4 is connected to the output end of the reverse isolation diode D1 , and the input end of the reverse isolation diode D1 is connected to the VBAT pin.