Power supply structure of liquid level sensor

Abstract

The utility model relates to the technical field of sensor power supply, in particular to a power supply structure of a liquid level sensor. The device comprises a power supply end, an interface end and a low-voltage wire harness used for connection. The power supply end is a system controller FCU of the hydrogen fuel engine; the interface end is a whole vehicle low-voltage port; a wiring harness butt joint interface is reserved at a low-voltage port of the whole vehicle; a system controller FCU of the hydrogen fuel engine is connected to a low-voltage port of the whole vehicle through a cable; one end of the low-voltage wire harness is connected to the low-voltage port, and the other end is connected to the liquid level sensor; the power supply end provides stable output voltage to supply power to the liquid level sensor, and a liquid level signal of the liquid level sensor is fed back to a system controller FCU of the hydrogen fuel engine. Compared with a traditional liquid level sensor power supply system, the liquid level sensor power supply system has the advantages that safety is not used, the high-side driving Pin of the system controller of the hydrogen fuel engine is used for supplying power to the liquid level sensor, the reliability of the system is improved, electrical connection is simplified, and the fault risk of the liquid level sensor power supply system is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor power supply, in particular to a power supply structure for a liquid level sensor. Background Art

[0002] The power supply of a traditional automotive radiator liquid level sensor is provided by the vehicle's battery through a fuse in the fuse box. In a vehicle with a hydrogen fuel engine, when the fuse burns out, the power supply to the liquid level sensor is interrupted, resulting in the inability to accurately monitor the radiator liquid level, thus affecting the operation of the vehicle's cooling system and the stability of the hydrogen fuel engine temperature control. Especially when the liquid level is below a certain value, it will affect the heat dissipation of the fuel cell stack in the hydrogen fuel engine, and in severe cases, it will cause damage to the fuel cell stack. In this case, the power supply of the liquid level sensor is particularly important to ensure that the liquid level sensor can work properly and guarantee the normal operation and safety of the vehicle. Therefore, a safe power supply structure for the liquid level sensor is needed. Summary of the Utility Model

[0003] The purpose of the utility model is to address the problems in the background art and propose a power supply structure for a liquid level sensor, which uses the high-side drive Pin of the system controller (FCU) of the hydrogen fuel engine to supply power to the liquid level sensor. This design not only improves the reliability of the system but also simplifies the electrical connection and reduces the failure risk of the liquid level sensor power supply system.

[0004] The technical solution of the utility model is a power supply structure for a liquid level sensor, including a power supply end, an interface end, and a low-voltage wire harness for connection;

[0005] The power supply end is the system controller FCU of the hydrogen fuel engine, which is used to supply power to the liquid level sensor;

[0006] The interface end is the vehicle low-voltage port; the vehicle low-voltage port reserves a wire harness docking interface; the system controller FCU of the hydrogen fuel engine is connected to the vehicle low-voltage port through a cable;

[0007] One end of the low-voltage wire harness is connected to the low-voltage port through the wire harness docking interface, and the other end is connected to the liquid level sensor;

[0008] The power supply end provides a stable output voltage to supply power to the liquid level sensor, and the liquid level signal of the liquid level sensor is fed back to the system controller FCU of the hydrogen fuel engine.

[0009] Preferably, the high-side drive output Pin of the system controller FCU of the hydrogen fuel engine is connected to the vehicle low-voltage port through a cable, and the high-side drive output Pin is connected to output a 24V voltage.

[0010] Preferably, the liquid level signal of the liquid level sensor is first fed back to the engine harness docking interface through a low-voltage harness, and then transmitted to the system controller FCU of the hydrogen fuel engine.

[0011] Preferably, the high-side drive output Pin circuit includes a GPIO interface, a high-side drive module, and an inductor;

[0012] The GPIO interface is the control end; after the key is powered on, the GPIO interface raises the voltage to turn on the thyristor of the high-side drive module, and the potential of the PIN foot OUT of the circuit output is equal to the potential of BAT, 24V, and the PIN foot outputs 24V voltage.

[0013] Preferably, when a short circuit occurs in the circuit, it is equivalent to the OUT terminal being directly connected to the ground, the potential of OUT is equal to 0V, the thyristor conducts, and the circuit is in an abnormal state; at this time, the GPIO interface pulls down the voltage to turn off the thyristor, and the OUT terminal no longer outputs.

[0014] Preferably, when an open circuit occurs in the circuit, the current on the thyristor pin is 0, and the circuit detects an abnormality; at this time, the GPIO interface pulls down the voltage to turn off the thyristor, and the OUT terminal no longer outputs.

[0015] Preferably, when a short circuit or open circuit occurs in the circuit, the fault signal is reported through CAN communication to the instrument to display a liquid level sensor fault.

[0016] Compared with the prior art, the present utility model has the following beneficial technical effects:

[0017] The present utility model is a power supply structure for a safe liquid level sensor. Compared with the traditional liquid level sensor power supply system, the present utility model does not use a fuse, but uses the high-side drive Pin of the system controller (FCU) of the hydrogen fuel engine to supply power to the liquid level sensor. This design scheme not only improves the reliability of the system, but also simplifies the electrical connection and reduces the fault risk of the liquid level sensor power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the power supply structure of the liquid level sensor in the embodiment of the present utility model;

[0019] Figure 2 It is a schematic diagram of the high-side drive output Pin circuit in the embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Embodiment 1

[0021] As Figure 1 shown, a liquid level sensor power supply structure proposed by the present utility model includes a power supply end, an interface end, and a low-voltage harness for connection;

[0022] The power supply end is the system controller FCU of the hydrogen fuel engine, which is used to supply power to the liquid level sensor;

[0023] The interface end is the vehicle low-voltage port; the vehicle low-voltage port reserves a wiring harness docking interface; the system controller FCU of the hydrogen fuel engine is connected to the vehicle low-voltage port through a cable;

[0024] One end of the low-voltage wiring harness is connected to the low-voltage port through the wiring harness docking interface, and the other end is connected to the liquid level sensor;

[0025] The power supply end provides a stable output voltage to supply power to the liquid level sensor, and the liquid level signal of the liquid level sensor is fed back to the system controller FCU of the hydrogen fuel engine. The high-side drive output Pin of the system controller FCU of the hydrogen fuel engine is connected to the vehicle low-voltage port through a cable, and the high-side drive output Pin is connected to output a 24V voltage; the liquid level signal of the liquid level sensor is first fed back to the engine wiring harness docking interface through the low-voltage wiring harness and then transmitted to the system controller FCU of the hydrogen fuel engine.

[0026] In the present utility model, the high-side drive Pin of the system controller (FCU) of the hydrogen fuel engine is used to supply power to the liquid level sensor, and the liquid level signal of the liquid level sensor is then transmitted to the system controller (FCU) through the low-voltage interface between the vehicle and the hydrogen fuel engine; different from the traditional power supply method using a fuse, this design scheme not only improves the reliability of the system but also simplifies the electrical connection and reduces the failure risk of the liquid level sensor power supply system.

[0027] Embodiment 2

[0028] As Figure 2 shown, a liquid level sensor power supply structure proposed by the present utility model, in which the high-side drive output Pin circuit includes a GPIO interface, a high-side drive module, and an inductor;

[0029] The GPIO interface is the control end; after the key is powered on, the GPIO interface pulls up the voltage to turn on the thyristor of the high-side drive module, and the potential of the circuit output PIN foot OUT is equal to the potential of BAT, 24V, and the PIN foot outputs 24V voltage.

[0030] When a short circuit occurs in the circuit, it is equivalent to the OUT end being directly connected to the ground, the potential of OUT is equal to 0V, the thyristor path is on, and the circuit is in an abnormal state; at this time, the GPIO interface pulls down the voltage to turn off the thyristor, and the OUT end no longer outputs.

[0031] When an open circuit occurs in the circuit, the current on the thyristor pin is 0, and the circuit detects an abnormality; at this time, the GPIO interface pulls down the voltage to turn off the thyristor, and the OUT end no longer outputs.

[0032] When a short circuit or open circuit occurs in the circuit, the fault signal is reported to the instrument through CAN communication to display the fault of the liquid level sensor. Both of these situations will be sent to the instrument through CAN communication, and the fault of the liquid level sensor line can be monitored in time, ensuring that the power supply system of the liquid level sensor is a complete closed loop. When a fault occurs, it can be monitored. After the fault is eliminated, the FCU automatically resumes the 24V power output. It constitutes a safe power supply structure for the liquid level sensor.

[0033] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to this. Within the scope of knowledge possessed by those skilled in the art to which the present invention pertains, various changes can be made without departing from the gist of the present invention.

Claims

1. A power supply structure for a liquid level sensor, characterized in that, It includes a power supply terminal, an interface terminal, and a low-voltage wire harness for connection; The power supply terminal is the system controller FCU of the hydrogen fuel engine, which is used to supply power to the liquid level sensor; The interface terminal is the vehicle low-voltage port; the vehicle low-voltage port reserves a wire harness docking interface; the system controller FCU of the hydrogen fuel engine is connected to the vehicle low-voltage port through a cable; One end of the low-voltage wire harness is connected to the low-voltage port through the wire harness docking interface, and the other end is connected to the liquid level sensor; The power supply terminal provides a stable output voltage to supply power to the liquid level sensor, and the liquid level signal of the liquid level sensor is fed back to the system controller FCU of the hydrogen fuel engine.

2. The power supply structure of a liquid level sensor according to claim 1, characterized in that, The high-side drive output Pin of the system controller FCU of the hydrogen fuel engine is connected to the vehicle low-voltage port through a cable, and the high-side drive output Pin is connected to output a 24V voltage.

3. The power supply structure of a liquid level sensor according to claim 1, characterized in that The liquid level signal of the liquid level sensor is first fed back to the engine wire harness docking interface through the low-voltage wire harness, and then transmitted to the system controller FCU of the hydrogen fuel engine.

4. A power supply structure for a liquid level sensor according to claim 2, characterized in that, The high-side drive output Pin circuit includes a GPIO interface, a high-side drive module, and an inductor; The GPIO interface is the control end; after the key is powered on, the GPIO interface pulls up the voltage to turn on the thyristor of the high-side drive module, and the potential of the circuit output PIN foot OUT is equal to the potential of BAT, which is 24V, and the PIN foot outputs a 24V voltage.

5. A power supply structure for a liquid level sensor according to claim 4, characterized in that, When a short circuit occurs in the circuit, it is equivalent to the OUT end being directly connected to the ground, the potential of OUT is equal to 0V, the thyristor path is on, and the circuit is in an abnormal state; at this time, the GPIO interface pulls down the voltage to turn off the thyristor, and the OUT end no longer outputs.

6. The power supply structure of a liquid level sensor according to claim 4, characterized in that, When an open circuit occurs in the circuit, the current on the thyristor pin is 0, and the circuit detects an abnormality; at this time, the GPIO interface pulls down the voltage to turn off the thyristor, and the OUT end no longer outputs.

7. A power supply structure for a liquid level sensor according to claim 5 or 6, characterized in that, When a short circuit or open circuit occurs in the circuit, the fault signal is reported through CAN communication to the instrument to display a liquid level sensor fault.

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