Heating monitoring system of high-power load input cable

Abstract

The invention discloses a heating monitoring system for a high-power load input cable, which is characterized in that a monitoring device is arranged in a connecting loop of a storage battery and a controller, collects the voltage of the positive electrode end of the storage battery and the voltage of the input end of the controller, and can compare and judge the voltage difference between the voltage of the positive electrode end of the storage battery and the voltage of the input end of the controller; the method comprises the following steps: determining the resistance floating and electrical loss conditions of a storage battery input loop, judging whether the impedance of the storage battery input loop is overlarge or not, and generating a voltage abnormity alarm signal, so that an ECU (Electronic Control Unit) can control the working state of a controller according to the voltage abnormity alarm signal, and timely turn off a high-power load; therefore, overcurrent detection and judgment on the input circuit of the storage battery are realized, abnormal overheating damage of a system loop is prevented, and the stability of the system loop is ensured.

Description

Technical Field

[0001] The invention relates to the field of automobile control systems, and in particular to a heating monitoring system for a high-power load input cable. Background Art

[0002] In the existing automotive field, the working principle of the controller is as follows Figure 1 As shown, the battery 1' inputs current to the controller 2', and the external ECU control unit 3' enables the controller 2' output through the CAN bus signal, so that the controller 2' sets the switching operating frequency of the high-power MOSFET gate driver through SPI communication, thereby driving the external high-power load 4' output. By changing the switching operating frequency, the current output by the external high-power load can be controlled.

[0003] The high-power load input cable is mainly used to connect the battery 1' and the controller 2' as an input circuit. When the controller 2' enables the external high-power load 4' to output, it provides a path guarantee for the power required by it. Usually, the power of the high-power load is about 2000W.

[0004] However, when the controller drives an external high-power load, as the switching operating frequency increases, the output current will continue to increase. Since there is a certain amount of internal resistance inside the battery power supply, when the external drive current continues to increase, the voltage drop caused by the internal resistance of the battery will also increase synchronously. At this time, the battery output voltage will decrease, causing the entire system circuit to become unstable and causing the system circuit to heat up.

[0005] To solve the above problems, the existing technology usually only sets overcurrent and short-circuit protection detection in the high-power load output part, while abnormal problems such as overcurrent and short circuit in the high-power input part will greatly increase the risk of system loop failure and heating. For example, when an abnormality occurs in the high-power input part but the high-power load output part has not fully reached the preset overcurrent threshold value, the existing technology cannot detect the abnormality, and the high-power input part will have overcurrent heating, thereby causing functional failure and heating of the entire system loop.

[0006] Therefore, how to effectively monitor the loop of the high-power input cable, detect the battery, and ensure the stability of the system loop in a timely manner has become an urgent problem to be solved in this field. Summary of the invention

[0007] In view of the defects of the prior art, the purpose of the present invention is to provide a heating monitoring system for high-power load input cables that can effectively detect and judge overcurrent in the input circuit of the battery to ensure the stability of the system circuit.

[0008] In order to achieve the above-mentioned object, the present invention provides a heating monitoring system for a high-power load input cable, comprising a battery, a controller, an ECU control unit and a high-power load, wherein the positive electrode of the battery is connected to the input end of the controller, and the ECU control unit controls the output end of the controller to transmit current to the high-power load, and also comprises a monitoring device,

[0009] One end of the monitoring device is connected to the positive electrode of the battery to collect the positive terminal voltage of the battery, and the other end is connected to the input end of the controller to collect the input terminal voltage of the controller, and compare and judge the voltage difference between the positive terminal voltage and the input terminal voltage to obtain a voltage abnormality alarm signal.

[0010] The monitoring device establishes a communication connection with the controller and the ECU control unit, and is configured to transmit the abnormal voltage alarm signal to the ECU control unit, so that the ECU control unit controls the working state of the controller.

[0011] Furthermore, the monitoring device includes an MCU module, a power module, a communication module and a voltage acquisition module. The power module is connected to a battery, and the communication module is configured to establish communication with the controller and the ECU control unit.

[0012] Furthermore, the voltage acquisition module is configured to periodically acquire the positive terminal voltage of the battery and the input terminal voltage of the controller through an acquisition PIN pin, and report the acquired data to the MCU module in real time through a GPIO port.

[0013] Furthermore, the MCU module is preset with a fault threshold value and is configured to receive data from the voltage acquisition module and perform comparison and judgment. If the voltage difference between the input terminal voltage and the positive terminal voltage exceeds the fault threshold value, the MCU module generates a voltage abnormality alarm signal and transmits the voltage abnormality alarm signal to the ECU control unit in real time.

[0014] Furthermore, the ECU control unit receives the voltage abnormality alarm signal and sends an enable signal for shutting down the high-power load to the controller, so as to control the controller to shut down the high-power load.

[0015] Furthermore, the controller shuts down the switching operating frequency of the high-power MOSFET gate driver through SPI communication to turn off the output of the high-power load.

[0016] Furthermore, if the voltage difference between the input terminal voltage and the positive terminal voltage does not exceed the fault threshold value, the monitoring device continues to collect and compare the positive terminal voltage of the battery and the input terminal voltage of the controller.

[0017] Furthermore, the positive electrode of the battery is connected to an external fuse.

[0018] Furthermore, the monitoring device and the controller are connected to the ECU control unit via a CAN bus.

[0019] The heating monitoring system for the high-power load input cable provided by the present invention adopts a monitoring device arranged in the connection circuit between the battery and the controller, and collects the positive terminal voltage of the battery and the input terminal voltage of the controller. The monitoring device can compare the voltage difference between the positive terminal voltage of the battery and the input terminal voltage of the controller to determine the resistance value fluctuation and power loss of the battery input circuit, judge whether the impedance of the battery input circuit is too large, and generate a voltage abnormality alarm signal, so that the ECU control unit can control the working state of the controller according to the voltage abnormality alarm signal, and shut down the high-power load in time, thereby realizing overcurrent detection and judgment of the battery input circuit, preventing the system circuit from abnormal overheating and damage, and ensuring the stability of the system circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] Figure 1 It is a connection diagram of a controller in the prior art;

[0022] Figure 2 A schematic diagram of a heating monitoring system for a high-power load input cable provided by the present invention;

[0023] Figure 3 is a schematic diagram of a monitoring device in the present invention;

[0024] Figure 4 This is a flow chart of the heating monitoring system for high-power load input cables provided by the present invention.

[0025] Reference numerals:

[0026] 1. Battery; 11. Positive electrode; 2. Controller; 21. Input terminal; 22. Output terminal; 3. High-power load; 4. ECU control unit; 5. Monitoring device; 51. MCU module; 52. Power module; 53. Communication module; 54. Voltage acquisition module; 6. CAN bus. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0028] See also Figure 2 , which shows an example of a heating monitoring system for a high-power load input cable provided by the present invention.

[0029] As can be seen from the figure, the heating monitoring system of the high-power load input cable in this example mainly includes a battery 1, a controller 2, a high-power load 3, an ECU control unit 4 and a monitoring device 5.

[0030] The positive pole 11 of the battery 1 is connected to the input terminal 21 of the controller 2 to provide power to the controller 2 . The output terminal 22 of the controller 2 is connected to the high-power load 3 . The ECU control unit 4 is configured to control the controller 2 to transmit current to the high-power load 3 .

[0031] Furthermore, one end of the monitoring device 5 is connected to the positive electrode 11 of the battery 1 to collect the positive terminal voltage of the battery 1, and the other end is connected to the input terminal 21 of the controller 2 to collect the input terminal voltage of the controller 2. The monitoring device 5 is configured to compare and judge the voltage difference between the positive terminal voltage and the input terminal voltage to determine the resistance fluctuation and power loss of the input circuit of the battery 1, and obtain the voltage abnormality alarm signal, so that the ECU control unit 4 can control the working state of the controller 2 according to the voltage abnormality alarm signal, shut down the high-power load 3 in time, and realize overcurrent detection and judgment of the input circuit of the battery 1, prevent abnormal overheating damage of the system circuit, and ensure the stability of the system circuit.

[0032] Specifically, combined Figure 3 The monitoring device 5 mainly includes an MCU module 51, a power module 52, a communication module 53 and a voltage acquisition module 54. The MCU module 51, the power module 52, the communication module 53 and the voltage acquisition module 54 can cooperate with each other to realize voltage acquisition, comparison judgment and signal transmission of the monitoring device 5 to ensure the effective operation of the monitoring device 5.

[0033] Furthermore, the power module 52 is connected to the battery 1 through an external power harness, so that the battery 1 can provide working power for the monitoring device 5, so that the power module 52 can provide working power for the MCU module 51, the communication module 53 and the voltage acquisition module 54, thereby ensuring the stable operation of the MCU module 51, the communication module 53 and the voltage acquisition module 54.

[0034] Furthermore, the voltage acquisition module 54 is configured to periodically collect the positive terminal voltage of the battery 1 and the input terminal voltage of the controller 2 through the acquisition PIN pin, and report the collected positive terminal voltage and input terminal voltage to the MCU module 51 in real time through the GPIO port, providing processing data for the MCU module 51.

[0035] In conjunction with this, the MCU module 51 is preset with a fault threshold value, so that after the MCU module 51 receives the data collected by the voltage acquisition module 54, it compares the voltage difference between the positive terminal voltage and the input terminal voltage with the fault threshold value. If the voltage difference exceeds the fault threshold value, the MCU module 51 determines that a voltage abnormality occurs in the input circuit of the battery 1, and generates a voltage abnormality alarm signal, and transmits the voltage abnormality alarm signal to the communication module 53 in real time.

[0036] Furthermore, the communication module 53 is configured to establish communication with the controller 2 and the ECU control unit 4. The communication module 53 and the controller 2 are twisted-pair connected via the CAN bus 6, and can receive and transmit the abnormal voltage alarm signal to the CAN bus 6, so that the CAN bus 6 transmits the abnormal voltage alarm signal to the ECU control unit 4, thereby enabling the ECU control unit 4 to control the working state of the controller 2 and ensure the safety and reliability of the system loop.

[0037] The monitoring device 5 thus constructed cooperates with the MCU module 51, the power module 52, the communication module 53 and the voltage acquisition module 54 to collect the positive terminal voltage of the battery 1 and the input terminal voltage of the controller 2, and then synchronously compares and judges the voltage difference between the positive terminal voltage and the input terminal voltage. When the voltage difference between the positive terminal voltage and the input terminal voltage exceeds the preset fault threshold value, it is judged that there is a large current abnormality in the input circuit of the battery 1, resulting in abnormal voltage drop at both ends of the wiring harness of the battery 1, causing the system circuit to heat up, and thus generating a voltage abnormality alarm signal, and transmitting the voltage abnormality alarm signal to the ECU control unit 4.

[0038] Combination Figure 4 Furthermore, the ECU control unit 4 receives the abnormal voltage warning signal and synchronously controls the controller 2 to shut down the high-power load 3, and no longer transmits current to the high-power load 3, so as to prevent long-term overcurrent from causing overheating and damage to the system circuit.

[0039] Specifically, the ECU control unit 4 sends an enable signal for shutting down the high-power load to the controller 2 through the CAN bus 6. Further, after the controller 2 receives the enable signal for shutting down the high-power load, the controller 2 shuts down the switching operating frequency of the high-power MOSFET gate driver through the SPI communication method inside the controller 2, thereby shutting down the output of the high-power load 3 to prevent abnormal overheating and damage to the system circuit.

[0040] Correspondingly, when the voltage difference between the input terminal voltage of the controller and the positive terminal voltage of the battery does not exceed the preset fault threshold value, the monitoring device 5 determines that the input circuit of the battery 1 is in a normal process state, and will not generate a voltage abnormality alarm signal, and continues to collect and compare the positive terminal voltage of the battery 1 and the input terminal voltage of the controller 2, so that the monitoring device 5 can perform real-time detection of the system loop.

[0041] Here, the monitoring device 5 and the controller 3 are connected to the ECU control unit 4 via the CAN bus 6, so that the ECU control unit 4 can maintain a reliable connection with the monitoring device 5 and the controller 3, receive the abnormal voltage alarm signal in time and control the working state of the controller 3, while extending the communication distance.

[0042] Furthermore, the positive pole 11 of the battery 1 is also connected to an external fuse, so that when an abnormally large current occurs in the controller 2, the external fuse can be blown, disconnecting the controller 2 from the battery 1, thereby protecting the system circuit from damage.

[0043] The heating monitoring system for high-power load input cables provided by the present invention adopts a monitoring device 5 in cooperation with a battery 1, a controller 2 and an ECU control unit 4 to achieve real-time monitoring of the input circuit of the battery 1 and ensure the safety and stability of the system loop.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A heating monitoring system for a high-power load input cable, comprising a battery, a controller, an ECU control unit and a high-power load, wherein the positive electrode of the battery is connected to the input end of the controller, and the ECU control unit controls the output end of the controller to transmit current to the high-power load, characterized in that: It also includes monitoring equipment, One end of the monitoring device is connected to the positive electrode of the battery to collect the positive terminal voltage of the battery, and the other end is connected to the input end of the controller to collect the input terminal voltage of the controller, and compare and judge the voltage difference between the positive terminal voltage and the input terminal voltage to obtain a voltage abnormality alarm signal. The monitoring device establishes a communication connection with the controller and the ECU control unit, and is configured to transmit the abnormal voltage alarm signal to the ECU control unit, so that the ECU control unit controls the working state of the controller.

2. The heating monitoring system for high-power load input cables according to claim 1 is characterized in that: The monitoring device includes an MCU module, a power module, a communication module and a voltage acquisition module. The power module is connected to a battery, and the communication module is configured to establish communication with the controller and the ECU control unit.

3. The heating monitoring system for high-power load input cables according to claim 2, characterized in that: The voltage acquisition module is configured to periodically acquire the positive terminal voltage of the battery and the input terminal voltage of the controller through the acquisition PIN pin, and report the acquired data to the MCU module in real time through the GPIO port.

4. The heating monitoring system for high-power load input cables according to claim 3 is characterized in that: The MCU module is preset with a fault threshold value and is configured to receive data from the voltage acquisition module and perform comparison and judgment. If the voltage difference between the input terminal voltage and the positive terminal voltage exceeds the fault threshold value, the MCU module generates a voltage abnormality alarm signal and transmits the voltage abnormality alarm signal to the ECU control unit in real time.

5. The heating monitoring system for high-power load input cables according to claim 4, characterized in that: The ECU control unit receives the voltage abnormality alarm signal and sends an enable signal for shutting down the high-power load to the controller, so as to control the controller to shut down the high-power load.

6. The heating monitoring system for high-power load input cables according to claim 5, characterized in that: The controller shuts down the switching operating frequency of the high-power MOSFET gate driver through the SPI communication mode to turn off the output of the high-power load.

7. The heating monitoring system for high-power load input cables according to claim 4, characterized in that: If the voltage difference between the input terminal voltage and the positive terminal voltage does not exceed the fault threshold value, the monitoring device continues to collect and compare the positive terminal voltage of the battery and the input terminal voltage of the controller.

8. The heating monitoring system for high-power load input cables according to claim 1, characterized in that: The positive pole of the battery is connected with an external fuse.

9. The heating monitoring system for high-power load input cables according to claim 1, characterized in that: The monitoring device and the controller are connected to the ECU control unit via a CAN bus.

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