Offline upgrading circuit of heat dissipation water pump

Abstract

The invention relates to the technical field of heat dissipation water pump controllers, in particular to a heat dissipation water pump off-line upgrading circuit which comprises a heat dissipation water pump power source and signal line terminal J1, an external off-line upgrading software module J2 and an MCU microcontroller U1, and positive electrode pins of the heat dissipation water pump power source and signal line terminal J1 are connected with VBAT pins, and negative electrode pins of the heat dissipation water pump power source and signal line terminal J1 are grounded. Wherein the heat dissipation water pump power supply and signal line terminal J1 and the external off-line upgrading software module J2 are connected with a TVS diode TV1, a filter capacitor C2, a pull-up resistor R4, a 0 omega patch resistor R7 and a current-limiting resistor R5 through mutually connected signal lines. The circuit has the advantage that the automobile heat dissipation water pump supports the LIN communication function through one signal line and peripheral components, and the problems that the whole upgrading process is time-consuming and labor-consuming and the working efficiency is low due to the fact that no MCU chip integrated with an LIN transceiver exists in the interior due to the price and the like in the market are solved.

Description

Technical Field

[0001] The 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 the cooling system of modern vehicles. It is mainly responsible for controlling the operation of the water pump to ensure that the engine runs within the optimal temperature range. Its main function is to improve the efficiency and life of the engine, optimize fuel economy, and bring a more reliable and comfortable driving experience to the driver through precise temperature monitoring and intelligent speed regulation.

[0003] At present, due to price and other reasons, there are MCU chips without integrated LIN transceivers on the market. If the MCU does not have an integrated LIN transceiver, 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 must be upgraded, and finally the cooling water pump must be installed back on the car for use. The entire upgrade process is time-consuming and labor-intensive, and the work efficiency is low. For this reason, we propose a cooling water pump offline upgrade circuit. Summary of the invention

[0004] The purpose of the present invention is to provide an offline upgrade circuit for a cooling water pump, which has the advantage of a signal line and peripheral components to enable the automobile cooling water pump to support the LIN communication function, and solves the problem that there are MCU chips without an integrated LIN transceiver on the market due to price and other reasons. If the MCU does not have an integrated LIN transceiver, the software cannot be upgraded offline through the signal line, and the cooling water pump must be disassembled from the automobile, the board-side software must be upgraded, and finally the cooling water pump must be installed back on the automobile for use. The entire upgrade process is time-consuming, labor-intensive, and has low work efficiency.

[0005] To achieve the above object, the present invention provides the following technical solution: a cooling 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, the external offline upgrade software module J2 and the MCU microcontroller U1 are connected to the VBAT pins and the negative pins are grounded;

[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 a pull-up resistor R1, a current limiting resistor R16 and a current limiting resistor R17, one end of the current limiting resistor R16 is connected to an RXD terminal of an MCU microcontroller U1, and one end of the pull-up resistor R2 and the pull-up resistor R1 are both connected to an 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 internally 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 cooling water pump driving 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 cooling water pump offline upgrade software, which provides great convenience for the subsequent repair, maintenance and detection of the cooling water pump.

[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 The schematic diagram of the circuit of the present invention is shown in FIG. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0024] Embodiment 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 all 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 mutually connected 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 A 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 is possible to prevent the cooling water pump from being powered by the external host computer. 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, the cooling water pump power supply and signal line terminal J1 and the external offline upgrade software module J2 are connected as follows on the premise that the cooling water pump has been installed on the car 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, the current limiting resistor R5, the pull-down resistor R8, the NPN transistor Q2, the pull-up resistor R2, the current limiting resistor R3, the pull-down resistor R6, the LIN communication line matching capacitor C1, the NPN transistor Q1, the pull-up resistor R1, the 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 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 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 on the car without disassembling the cooling water pump, which provides great convenience for the later repair, maintenance and detection of the cooling water pump.

[0027] Embodiment 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 needs the host computer to use PWM input signal to adjust 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 adjusted according to the input PWM signal.

[0030] Embodiment 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 the cooling water pump, the 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] Embodiment 4

[0034] Based on the first embodiment, the present invention is as follows Figure 1 As shown, it is disclosed 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, 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, when the VBE0.6V to 0.7V conduction condition of the NPN transistor Q5 is reached, 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 solution 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 solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution 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 supply and signal line terminal J1, the external offline upgrade software module J2 and the MCU microcontroller U1 are connected to the VBAT pins and the negative pins are grounded; 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 a pull-up resistor R1, a current limiting resistor R16 and a current limiting resistor R17, one end of the current limiting resistor R16 is connected to an RXD terminal of an MCU microcontroller U1, and one end of the pull-up resistor R2 and the pull-up resistor R1 are both connected to an 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 cooling water pump offline upgrade circuit 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 off-line 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 off-line upgrade circuit for a heat dissipation water pump according to claim 1, characterized in that: The MCU microcontroller U1 adopts serial port communication.

5. The off-line 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 internally integrated LIN transceiver.

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

7. The off-line 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 off-line 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, and one end of the current sampling resistor R15 and the emitter of the NPN transistor Q5 are both grounded.

9. The cooling water pump offline upgrade circuit 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 cooling water pump offline upgrade circuit 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.

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