Fuel water content sensor, water content monitoring method, internal combustion engine, ECU and vehicle

Abstract

This invention relates to the field of internal combustion engine technology, providing a fuel water content sensor, a water content monitoring method, an internal combustion engine, an ECU, and a vehicle. The sensor includes: a first transistor, a power interface, a detection signal output interface, a first protective resistor, and first and second detection contacts. The first and second detection contacts are arranged at intervals and are used to contact the fuel to be detected. The base of the first transistor is connected to the first detection contact, the collector is connected to the second detection contact and the power interface, and the emitter is connected to the detection signal output interface through the first protective resistor. When the power interface is connected to an external power source and the detection signal output interface is connected to a signal acquisition terminal, if the fuel to be detected contains water, a current is generated between the first and second detection contacts, and the signal acquisition terminal acquires the transistor's conduction signal. This invention addresses the shortcomings of existing technologies that use float-type sensors for fuel water content monitoring, which result in low monitoring accuracy and affect the reliability of internal combustion engines.

Description

Technical Field

[0001] This invention relates to the field of internal combustion engine technology, and in particular to a fuel water content sensor, a water content monitoring method, an internal combustion engine, an ECU, and a vehicle. Background Technology

[0002] The operation of an internal combustion engine places high demands on fuel quality. With the continuous upgrading of common rail systems and emissions standards, fuel quality is becoming increasingly important. If a large amount of water in the fuel is not removed in time, it will seriously affect the reliability of the internal combustion engine. Therefore, a high-quality fuel water content alarm device is a crucial component of an internal combustion engine.

[0003] In fuel water content alarm devices, float-type sensors are typically used to monitor the fuel water content. This involves a float with a density between fuel and water, whose height changes as the amount of water in the fuel increases. When the fuel water content reaches a certain level, a magnetic reed inside the float triggers a sensor within the reed column, activating the alarm circuit and alerting the user. Therefore, the effectiveness of a fuel water content alarm depends on the distance between the magnetic reed in the float and the sensor. Setting the distance too small can easily cause false alarms, while setting it too large can lead to excessively high fuel water content, affecting the reliability of the internal combustion engine. Summary of the Invention

[0004] This invention provides a fuel water content sensor, a fuel water content monitoring method, an internal combustion engine, and a vehicle, to solve the defects in the prior art where the use of float-type sensors for fuel water content monitoring results in low monitoring accuracy and affects the reliability of the internal combustion engine.

[0005] In a first aspect, the present invention provides a fuel water content sensor, comprising: a first transistor, a power interface, a detection signal output interface, a first protection resistor, a first detection contact, and a second detection contact;

[0006] The first detection contact and the second detection contact are arranged at intervals and are used to contact the fuel to be detected;

[0007] The base of the first transistor is connected to the first detection contact, the collector of the first transistor is connected to the second detection contact and the power interface respectively, and the emitter of the first transistor is connected to the detection signal output interface through the first protection resistor.

[0008] When an external power source is connected to the power interface and a signal acquisition terminal is connected to the detection signal output interface, if the fuel to be detected contains water, a current is generated between the first detection contact and the second detection contact to conduct the collector and emitter of the first transistor. The signal acquisition terminal acquires the transistor conduction signal through the detection signal output interface.

[0009] In a second aspect, the present invention also provides a fuel water content sensor, comprising: the structure of the fuel water content sensor as described above, a second transistor, a second protection resistor, and a third detection contact arranged at intervals from both the first detection contact and the second detection contact;

[0010] The base of the second transistor is connected to the first detection contact, the collector of the second transistor is connected to the third detection contact and the detection signal output interface respectively, the emitter of the second transistor is connected to the power interface through the second protection resistor, and a diode is connected in series on both the second and third detection contacts.

[0011] When the power interface is connected to an external power source and the detection signal output interface is connected to a signal acquisition terminal, if the fuel to be detected contains water, a current is generated between the first detection contact and the second detection contact to conduct the collector and emitter of the first transistor. The signal acquisition terminal acquires the transistor conduction signal through the detection signal output interface. When the power interface is connected to the signal acquisition terminal and the detection signal output interface is connected to the external power source, if the fuel to be detected contains water, a current is generated between the first detection contact and the third detection contact to conduct the collector and emitter of the second transistor. The signal acquisition terminal acquires the transistor conduction signal through the power interface.

[0012] The fuel water content sensor according to the present invention further includes a voltage divider resistor;

[0013] The voltage divider resistor is connected between the power interface and the detection signal output interface to divide the voltage of the pull-up resistor connected to the signal acquisition terminal, so as to determine the working status of the fuel water content sensor and whether the fuel to be tested contains water based on the voltage value of the pull-up resistor. The working status includes normal connection, abnormal connection, and the type of abnormal connection.

[0014] Thirdly, the present invention also provides a method for monitoring fuel water content based on a fuel water content sensor as described above, comprising:

[0015] Acquire the detection signal collected by the signal acquisition terminal;

[0016] Based on the detection signal, it is determined whether the fuel to be tested contains water;

[0017] Specifically, when the detection signal is a transistor on signal, the water content of the fuel to be detected is determined;

[0018] When the detection signal is a transistor off signal, it is determined that the fuel to be tested does not contain water.

[0019] Fourthly, the present invention also provides a method for monitoring fuel water content based on the fuel water content sensor as described above, comprising:

[0020] Obtain the voltage value of the pull-up resistor acquired by the signal acquisition terminal;

[0021] Based on the voltage value, determine the operating status of the fuel water content sensor and whether the fuel to be tested contains water;

[0022] Wherein, when the voltage value is within the first preset voltage range, it is determined that the working state of the fuel water content sensor is normal connection and the fuel to be detected does not contain water. The first preset voltage range is a voltage range formed by extending the first preset range based on the first voltage. The first voltage is the voltage value of the pull-up resistor when the first transistor and / or the second transistor is disconnected.

[0023] When the voltage value is within the second preset voltage range, it is determined that the working state of the fuel water content sensor is normal connection, and the fuel water content to be detected is determined. The second preset voltage range is a voltage range formed by extending the second preset range based on the second voltage. The second voltage is the voltage value of the pull-up resistor when the first transistor or the second transistor is turned on.

[0024] When the voltage value is within the third preset voltage range, the working state of the fuel water content sensor is determined to be a connection abnormality, and the type of the connection abnormality is a short circuit to ground of the power interface, a short circuit to ground of the detection signal output interface, or an open circuit of the fuel water content sensor. The third preset voltage range is a voltage range formed by extending the third preset range based on the third voltage, and the third voltage is 0.

[0025] When the voltage value is within the fourth preset voltage range, the working state of the fuel water content sensor is determined to be a connection abnormality, and the type of the connection abnormality is that the power interface and the detection signal output interface are short-circuited to each other or the detection signal output interface is short-circuited to an external power source. The fourth preset voltage range is a voltage range formed by extending the fourth preset range based on the fourth voltage, and the fourth voltage is the output voltage of the external power source.

[0026] Fifthly, the present invention also provides an internal combustion engine equipped with a fuel water content sensor as described in any of the above claims.

[0027] Sixthly, the present invention also provides an engine ECU (Electronic Control Unit), which provides an external power supply to the fuel water content sensor as described in any of the above embodiments and acquires the detection signal of the fuel water content sensor.

[0028] According to the engine ECU of the present invention, the engine ECU further includes a pull-up resistor.

[0029] In a seventh aspect, the present invention also provides a vehicle comprising an engine ECU as described above, and a fuel water content sensor as described above, or an internal combustion engine.

[0030] Eighthly, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the fuel water content monitoring method as described above.

[0031] This invention provides a fuel water content sensor, a water content monitoring method, an internal combustion engine, an ECU, and a vehicle. By incorporating a fuel water content sensor including a first transistor, the power interface of the fuel water content sensor is connected to an external power source, and the detection signal output interface is connected to a signal acquisition terminal. When the fuel water content is to be detected, a weak current is generated between the first and second detection contacts to the base of the first transistor. This weak current at the base of the first transistor amplifies the current at the collector of the first transistor, causing the base and emitter of the first transistor to conduct. Consequently, the signal acquisition terminal can acquire the transistor conduction signal through the detection signal output interface. In other words, by utilizing the current amplification effect of the transistor, accurate detection of whether water is present in the fuel is achieved, thereby improving the reliability of the internal combustion engine. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a fuel water content sensor provided in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of another fuel water content sensor provided in an embodiment of the present invention;

[0035] Figure 3 This is an embodiment of the present invention that provides a method for... Figure 1 The diagram shows the structure of the improved fuel water content sensor.

[0036] Figure 4 This is an embodiment of the present invention that provides a method for... Figure 2 The diagram shows the structure of the improved fuel water content sensor.

[0037] Figure 5 This is a schematic flowchart of a fuel water content monitoring method provided in an embodiment of the present invention;

[0038] Figure 6 This is a schematic flowchart of another fuel water content monitoring method provided in an embodiment of the present invention;

[0039] Figure 7 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention;

[0040] Figure label:

[0041] 1: First transistor; 2: Power interface; 3: Detection signal output interface; 4: First protection resistor; 5: First detection contact; 6: Second detection contact; 7: External power supply; 8: Signal acquisition terminal; 9: Second transistor; 10: Second protection resistor; 11: Third detection contact; 12: First diode; 13: Second diode; 14: Voltage divider resistor; 15: Pull-up resistor. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0043] A fuel water content sensor of the present invention will now be described with reference to the accompanying drawings. The structure of the sensor is as follows: Figure 1 As shown, it includes: a first transistor 1, a power interface 2, a detection signal output interface 3, a first protection resistor 4, a first detection contact 5, and a second detection contact 6;

[0044] The first detection contact 5 and the second detection contact 6 are arranged at intervals and are used to contact the fuel to be tested;

[0045] The base of the first transistor 1 is connected to the first detection contact 5, the collector of the first transistor 1 is connected to the second detection contact 6 and the power interface 2 respectively, and the emitter of the first transistor 1 is connected to the detection signal output interface 3 through the first protection resistor 4.

[0046] When the power interface 2 is connected to an external power source 7 and the detection signal output interface 3 is connected to a signal acquisition terminal 8, if the fuel to be detected contains water, a current is generated between the first detection contact 5 and the second detection contact 6 to conduct the collector and emitter of the first transistor 1. The signal acquisition terminal 8 acquires the transistor conduction signal from the detection signal output interface 3.

[0047] Specifically, when using the fuel water content sensor provided in this embodiment of the invention to monitor fuel water content, the power interface of the fuel water content sensor can be connected to an external power source, and the detection signal output interface can be connected to a signal acquisition terminal, such as the detection contact of an engine ECU (Electronic Control Unit), with the first and second detection contacts exposed in the fuel filter. When the fuel to be detected in the fuel filter contains water, a weak current can be generated between the first and second detection contacts to the base of the first transistor. This weak current at the base of the first transistor can amplify the current at the collector of the first transistor, causing the base and emitter of the first transistor to conduct. Consequently, the detection contact of the engine ECU can acquire the transistor conduction signal of the first transistor through the detection signal output interface. When the fuel to be tested does not contain water, that is, when the medium between the first detection contact and the second detection contact is fuel, the first detection contact and the second detection contact are insulated from each other, and no current flows through the base of the first transistor. Therefore, there is no current amplification phenomenon, and the first transistor is in the open state. The detection contact of the engine ECU can collect the transistor open signal of the first transistor through the detection signal output interface. This realizes the accurate detection of whether there is water in the fuel by utilizing the current amplification effect of the transistor, thereby improving the reliability of the internal combustion engine.

[0048] More specifically, by setting the emitter of the first transistor to be connected to the detection signal output interface through the first protection resistor, on the one hand, the current passing through the first transistor can be reduced when the first transistor is turned on, thereby preventing the first transistor from burning out and improving the service life of the fuel water content sensor; on the other hand, excessive current can be avoided from affecting other circuits.

[0049] It should be noted that the water content and water-free status of the fuel to be tested in the embodiments of the present invention do not correspond to a water content greater than 0% and a water content equal to 0%, respectively. Rather, they represent a degree of water content. That is, the water content of the fuel to be tested means that the water content in the fuel is sufficient to generate a weak current between the first detection contact and the second detection contact, while the water-free status of the fuel to be tested means that the water content in the fuel is insufficient to generate a weak current between the first detection contact and the second detection contact.

[0050] It is understood that when the power interface of the fuel water content sensor provided in the above embodiment is connected to the signal acquisition terminal and the detection signal output interface is connected to an external power source, the first transistor will not conduct due to the weak current formed between the first detection contact and the second detection contact, regardless of whether the fuel to be detected contains water. Therefore, it is impossible to detect whether the fuel to be detected contains water.

[0051] Based on this, in the fuel water content sensor provided in the following embodiments of the present invention, by adding a second transistor and a third detection contact to the structure of the fuel water content sensor provided in the above embodiments of the present invention, it is possible to detect whether the fuel contains water when the power interface and detection signal output interface of the fuel water content sensor are connected to any two external power supplies and signal acquisition terminals.

[0052] Specifically, embodiments of the present invention also provide a method such as Figure 2 As shown in Figure 1 The fuel water content sensor shown has a structure in which a second transistor 9, a second protection resistor 10, and a third detection contact 11 arranged at intervals from both the first detection contact 5 and the second detection contact 6 are added.

[0053] The base of the second transistor 9 is connected to the first detection contact 5, the collector of the second transistor 9 is connected to the third detection contact 11 and the detection signal output interface 3, the emitter of the second transistor 9 is connected to the power interface 2 through the second protection resistor 10, and diodes are connected in series on both the second detection contact 6 and the third detection contact 11, that is, a first diode 12 is connected in series on the second detection contact 6, and a second diode 13 is connected in series on the third detection contact 11.

[0054] Therefore, when the power interface 2 is connected to the external power supply 7 and the detection signal output interface 3 is connected to the signal acquisition terminal 8, if the fuel to be tested contains water, a current is generated between the first detection contact 5 and the second detection contact 6 to conduct the collector and emitter of the first transistor 1. The signal acquisition terminal 7 acquires the transistor conduction signal through the detection signal output interface 3. When the power interface 2 is connected to the signal acquisition terminal 8 and the detection signal output interface 3 is connected to the external power supply 7, if the fuel to be tested contains water, a current is generated between the first detection contact 5 and the third detection contact 10 to conduct the collector and emitter of the second transistor 9. The signal acquisition terminal 8 can also acquire the transistor conduction signal through the power interface 2.

[0055] More specifically, by configuring the fuel water content sensor to include a first transistor and a second transistor, when using the fuel water content sensor provided in this embodiment of the invention to detect whether the fuel contains water, it is not necessary to consider the correspondence between the power interface and the detection signal output interface of the fuel water content sensor and the external power supply and signal acquisition terminal. This avoids the inability to detect the fuel when the interface is connected incorrectly, and also facilitates the placement of the fuel water content sensor on the internal combustion engine.

[0056] Furthermore, the second protective resistor serves the same function as the first protective resistor. By adding a second protective resistor to the fuel water content sensor, the second transistor and other circuits are protected, thus extending the lifespan of the fuel water content sensor. Simultaneously, by incorporating both a first diode and a second diode in the fuel water content sensor, backflow current can be effectively prevented, thereby improving the sensor's safety and lifespan.

[0057] It should be noted that the fuel water content sensor provided in the above embodiments of the present invention detects whether the fuel contains water by determining the on / off state of the fuel water content sensor based on digital signals. Considering that during the process of detecting whether the fuel contains water, detection errors may occur due to faults such as short circuits or open circuits of the fuel water content sensor, it is necessary to further test the working status of the fuel water content sensor itself.

[0058] Therefore, based on the content of the above embodiments, such as Figure 3 or Figure 4 As shown, this embodiment of the invention also uses a voltage divider resistor 14 in the fuel water content sensor to determine the working state of the fuel water content sensor and whether the fuel to be tested contains water based on an analog signal.

[0059] The voltage divider resistor 14 is connected between the power interface 2 and the detection signal output interface 3 to divide the voltage of the pull-up resistor 15 connected to the signal acquisition terminal 8, so as to determine the working status of the fuel water content sensor and whether the fuel to be tested contains water based on the voltage value of the pull-up resistor 15. The working status includes normal connection, abnormal connection, and the type of abnormal connection.

[0060] It should be noted that, Figure 3 and Figure 4 They are respectively in such Figure 1 and Figure 2 The diagram shows the structure of the fuel water content sensor after adding a voltage divider resistor.

[0061] Specifically, by adding a voltage divider resistor to the structure of the fuel water content sensor and connecting a pull-up resistor to the signal acquisition terminal, the working status detection of whether the fuel contains water and whether the fuel water content sensor is correctly connected to the power interface, signal acquisition terminal, etc. is realized based on the voltage value of the pull-up resistor.

[0062] In one specific embodiment, to such Figure 3 The fuel water content sensor shown is connected to the engine ECU to detect whether the fuel in the fuel filter contains water. Assuming the power interface is connected to the 24V power supply provided by the engine ECU, the detection signal output interface is connected to the voltage measurement point of the engine ECU, and the first protection resistor R... P1 Voltage divider resistor R Z and pull-up resistor R L The resistance values ​​are 1kΩ, 20kΩ, and 20kΩ respectively. If the fuel to be tested does not contain water, the first and second detection contacts are insulated from each other, no current flows through the base of the first transistor, and therefore no amplified current flows through the first transistor. The current output from the 24V power supply can only pass through the voltage divider resistor R. Z and pull-up resistor R L Therefore, the pull-up resistance R measured at the voltage measuring point at this time is... L The voltage value is U = 24 * [R] L / (R Z +R L )] = 12V; If the fuel to be detected contains water, a weak current can be generated between the first and second detection contacts to the base of the first transistor. The weak current at the base of the first transistor will amplify the current at the collector of the first transistor. Then, the current output from the 24V power supply can pass through the first transistor and the first protection resistor R. P1 and pull-up resistor R L Finally, it reaches ground; therefore, the pull-up resistance R measured at the voltage measuring point at this time... L The voltage value is U = 24 * RL / [R z *R p1 / (R p1 +R z )+R L = 22.9V; however, if the power interface or detection signal output interface is short-circuited to ground, or the fuel water content sensor is open-circuited, the pull-up resistor R measured at the voltage measuring point will be 22.9V; L The voltage value is 0V; however, when the power interface and the detection signal output interface are short-circuited to each other, or when the power interface is short-circuited to the 24V power supply, the pull-up resistor R measured at the voltage measuring point is 0V. L The voltage value is 24V.

[0063] In another specific embodiment, to such Figure 4 The fuel water content sensor shown is connected to the engine ECU and is used to detect whether the fuel in the fuel filter contains water. Assuming the power supply from the engine ECU is still 24V, the first protection resistor R... P1 Second protection resistor R P1 Voltage divider resistor R Z and pull-up resistor R L The resistance values ​​are 1kΩ, 1kΩ, 20kΩ, and 20kΩ, respectively. If the fuel to be tested does not contain water, regardless of whether the power interface is connected to a 24V power supply and the detection signal output interface is connected to a voltage measuring point, or vice versa, the first, second, and third detection contacts are all mutually insulated. No current flows through the bases of the first and second transistors, therefore no amplified current flows through either transistor. The current output from the 24V power supply can only pass through the voltage divider resistor R. Z and pull-up resistor R L Therefore, the pull-up resistance R measured at the voltage measuring point at this time is... L The voltage value is U = 24 * [R] L / (R Z +R L )] = 12V;

[0064] If the fuel to be tested contains water, and the power interface is connected to a 24V power supply, and the detection signal output interface is connected to a voltage measuring point, a weak current can be generated between the first and second detection contacts to the base of the first transistor. This weak current at the base of the first transistor will amplify the current at its collector. Therefore, the current output from the 24V power supply can pass through the first transistor and the first protection resistor R. P1 and pull-up resistor R L Finally, the voltage reaches ground. Simultaneously, the second transistor will not conduct. Therefore, the pull-up resistance R measured at the voltage measuring point at this time... L The voltage value is U = 24 * R L / [R z *R p1 / (R p1 +R z )+R L = 22.9V.

[0065] If the fuel to be tested contains water, and the power interface is connected to a voltage measuring point, and the detection signal output interface is connected to a 24V power supply, then a weak current can be generated between the first and third detection contacts to the base of the second transistor. This weak current at the base of the second transistor will amplify the current at its collector. Therefore, the current output from the 24V power supply can pass through the second transistor and the second protection resistor R. P2 and pull-up resistor R L Finally, the voltage reaches ground. Simultaneously, the first transistor will not conduct. Therefore, the pull-up resistance R measured at the voltage measuring point at this time... L The voltage value is U = 24 * R L / [R z *R p2 / (R p2 +R z )+R L = 22.9V.

[0066] Similarly, if the power interface or detection signal output interface is short-circuited to ground, or the fuel water content sensor is open-circuited, the voltage measurement point will detect the pull-up resistor R. L The voltage value is 0V; however, when the power interface and the detection signal output interface are short-circuited to each other, or when the power interface is short-circuited to the 24V power supply, the pull-up resistor R measured at the voltage measuring point is 0V. L The voltage value is 24V.

[0067] As can be seen, the fuel water content sensor provided in this embodiment of the invention can not only measure the pull-up resistor R at the engine ECU voltage measurement point, but also... L The voltage value can accurately detect whether the fuel contains water. It can also detect faults such as open circuit of sensor, short circuit between two wires of sensor, and short circuit to ground of sensor detection signal output interface wiring harness, thereby facilitating users to troubleshoot internal combustion engine faults and improving fault removal efficiency.

[0068] It is understood that the values ​​mentioned in the above specific embodiments, such as the 24V power supply and the 1kΩ resistance of the first protection resistor, are exemplary values ​​and not absolute values. For example, the power supply could also be 5V, 12V, etc. Meanwhile, regarding the operating state of the fuel or fuel water content sensor to be detected, the pull-up resistor R measured at the voltage measuring point... LThe voltage value is also an exemplary theoretical value. Because of factors such as fluctuations in the external power supply output voltage and internal resistance in the wiring harness of the fuel water content sensor, the actual voltage value measured at the voltage measurement point may deviate from the theoretical value. Therefore, in order to improve the engine ECU's performance based on the pull-up resistor R... L The voltage value is used to determine the accuracy of the working state of the fuel and fuel water content sensor. The engine ECU is allowed to use the state corresponding to the actual measured voltage value as the determined result when there is a certain deviation between the actual measured voltage value and the theoretical value, for example, a deviation of ±0.5V from the theoretical value.

[0069] The present invention provides a method for monitoring the water content of fuel. The method described below can be referred to in correspondence with the fuel water content sensor described above.

[0070] The fuel water content monitoring method based on the fuel water content sensor provided in any of the above embodiments, as provided in this invention, is executed in the engine ECU of a vehicle. This fuel water content monitoring method is as follows: Figure 5 As shown, it includes the following steps:

[0071] 501. Acquire the detection signal collected by the signal acquisition terminal;

[0072] 502. Based on the detection signal, determine whether the fuel to be detected contains water;

[0073] Specifically, when the detection signal is a transistor on signal, it is determined that the fuel to be detected contains water; when the detection signal is a transistor off signal, it is determined that the fuel to be detected does not contain water.

[0074] The fuel water content monitoring method provided in this invention uses the detection signal of a transistor fuel water content sensor to determine whether the fuel to be tested contains water. This achieves accurate detection of whether the fuel contains water by utilizing the current amplification effect of the transistor, thereby improving the reliability of the internal combustion engine.

[0075] This invention also provides another fuel water content monitoring method based on the fuel water content sensor provided in any of the above embodiments, which is also executed in the vehicle's engine ECU. This fuel water content monitoring method is as follows: Figure 6 As shown, it includes the following steps:

[0076] 601. Obtain the voltage value of the pull-up resistor acquired by the signal acquisition terminal;

[0077] 602. Based on the voltage value, determine the working state of the fuel water content sensor and whether the fuel to be tested contains water;

[0078] Specifically, when the voltage value is within a first preset voltage range, the fuel water content sensor is determined to be in normal working condition, and the fuel to be detected does not contain water. The first preset voltage range is a voltage range formed by extending a first preset range based on a first voltage, where the first voltage is the voltage value of the pull-up resistor when the first transistor and / or the second transistor is disconnected. When the voltage value is within a second preset voltage range, the fuel water content sensor is determined to be in normal working condition, and the fuel to be detected contains water. The second preset voltage range is a voltage range formed by extending a second preset range based on a second voltage, where the second voltage is the voltage value of the pull-up resistor when the first transistor or the second transistor is turned on. When the voltage value is within a third preset voltage range... When the voltage value is within the specified range, the operating state of the fuel water content sensor is determined to be a connection abnormality, and the type of connection abnormality is a short circuit between the power interface and ground, a short circuit between the detection signal output interface and ground, or an open circuit of the fuel water content sensor. The third preset voltage range is a voltage range formed by extending the third preset range based on the third voltage, and the third voltage is 0. When the voltage value is within the fourth preset voltage range, the operating state of the fuel water content sensor is determined to be a connection abnormality, and the type of connection abnormality is a short circuit between the power interface and the detection signal output interface or a short circuit between the detection signal output interface and the external power supply. The fourth preset voltage range is a voltage range formed by extending the fourth preset range based on the fourth voltage, and the fourth voltage is the output voltage of the external power supply.

[0079] This invention also provides an internal combustion engine including a fuel water content sensor as described in any of the above embodiments.

[0080] It is understood that internal combustion engines including fuel water content sensors as described in any of the above embodiments have all the advantages and technical effects of fuel water content sensors provided in any of the above embodiments, which will not be repeated here.

[0081] This invention also provides an engine ECU, which provides an external power supply to the fuel water content sensor as described in any of the above embodiments and acquires the detection signal of the fuel water content sensor.

[0082] Based on the above embodiments, the engine ECU also includes a pull-up resistor.

[0083] The engine ECU provided in this embodiment of the invention, by adding a pull-up resistor, in conjunction with the first protection resistor, the second protection resistor, and the voltage divider resistor in the fuel water content sensor provided in this embodiment of the invention, not only achieves accurate detection of whether the fuel to be tested contains water, but also achieves detection of faults such as open circuit and short circuit of the fuel water content sensor.

[0084] This invention also provides a vehicle including an engine ECU as described in any of the above embodiments, and a fuel water content sensor or internal combustion engine as described in any of the above embodiments.

[0085] It is understood that vehicles including the engine ECU as described in any of the above embodiments, as well as the fuel water content sensor or internal combustion engine as described in any of the above embodiments, have all the advantages and technical effects of the engine ECU, fuel water content sensor or internal combustion engine provided in any of the above embodiments, which will not be repeated here.

[0086] Figure 7A schematic diagram of the physical structure of an electronic device is provided. This electronic device may include a processor 710, a communications interface 720, a memory 730, and a communication bus 740. The processor 710, communications interface 720, and memory 730 communicate with each other via the communication bus 740. The processor 710 can call logical instructions in the memory 730 to execute a fuel water content monitoring method. The method includes: acquiring a detection signal collected by a signal acquisition terminal; determining whether the fuel to be detected contains water based on the detection signal; wherein, when the detection signal is a transistor on signal, the fuel to be detected is determined to contain water; and when the detection signal is a transistor off signal, the fuel to be detected is determined to not contain water. Alternatively, it may include: acquiring the voltage value of the pull-up resistor collected by the signal acquisition terminal; determining the operating state of the fuel water content sensor and whether the fuel to be tested contains water based on the voltage value; wherein, when the voltage value is within a first preset voltage range, the operating state of the fuel water content sensor is determined to be normally connected, and the fuel to be tested does not contain water, the first preset voltage range is a voltage range formed by extending a first preset range based on a first voltage, and the first voltage is the voltage value of the pull-up resistor when the first transistor and / or the second transistor is disconnected; when the voltage value is within a second preset voltage range, the operating state of the fuel water content sensor is determined to be normally connected, and the fuel to be tested contains water, the second preset voltage range is a voltage range formed by extending a second preset range based on a second voltage, and the second voltage is the voltage value of the pull-up resistor when the first transistor and / or the second transistor is disconnected. When the transistor is turned on, the voltage value of the pull-up resistor; when the voltage value is within a third preset voltage range, the working state of the fuel water content sensor is determined to be a connection abnormality, and the type of the connection abnormality is a short circuit to ground of the power interface, a short circuit to ground of the detection signal output interface, or an open circuit of the fuel water content sensor, the third preset voltage range is a voltage range formed by extending the third preset range based on the third voltage, and the third voltage is 0; when the voltage value is within a fourth preset voltage range, the working state of the fuel water content sensor is determined to be a connection abnormality, and the type of the connection abnormality is a short circuit between the power interface and the detection signal output interface or a short circuit between the detection signal output interface and the external power supply, the fourth preset voltage range is a voltage range formed by extending the fourth preset range based on the fourth voltage, and the fourth voltage is the output voltage of the external power supply.

[0087] Furthermore, the logical instructions in the aforementioned memory 730 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0088] On the other hand, the present invention also provides a computer program product, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, wherein when the program instructions are executed by a computer, the computer is able to execute a fuel water content monitoring method provided by the above methods, the method comprising: acquiring a detection signal acquired by a signal acquisition terminal; determining whether the fuel to be detected contains water based on the detection signal; wherein, when the detection signal is a transistor on signal, the fuel to be detected is determined to contain water; and when the detection signal is a transistor off signal, the fuel to be detected is determined to not contain water. Alternatively, it may include: acquiring the voltage value of the pull-up resistor collected by the signal acquisition terminal; determining the operating state of the fuel water content sensor and whether the fuel to be tested contains water based on the voltage value; wherein, when the voltage value is within a first preset voltage range, the operating state of the fuel water content sensor is determined to be normally connected, and the fuel to be tested does not contain water, the first preset voltage range is a voltage range formed by extending a first preset range based on a first voltage, and the first voltage is the voltage value of the pull-up resistor when the first transistor and / or the second transistor is disconnected; when the voltage value is within a second preset voltage range, the operating state of the fuel water content sensor is determined to be normally connected, and the fuel to be tested contains water, the second preset voltage range is a voltage range formed by extending a second preset range based on a second voltage, and the second voltage is the voltage value of the pull-up resistor when the first transistor and / or the second transistor is disconnected. When the transistor is turned on, the voltage value of the pull-up resistor; when the voltage value is within a third preset voltage range, the working state of the fuel water content sensor is determined to be a connection abnormality, and the type of the connection abnormality is a short circuit to ground of the power interface, a short circuit to ground of the detection signal output interface, or an open circuit of the fuel water content sensor, the third preset voltage range is a voltage range formed by extending the third preset range based on the third voltage, and the third voltage is 0; when the voltage value is within a fourth preset voltage range, the working state of the fuel water content sensor is determined to be a connection abnormality, and the type of the connection abnormality is a short circuit between the power interface and the detection signal output interface or a short circuit between the detection signal output interface and the external power supply, the fourth preset voltage range is a voltage range formed by extending the fourth preset range based on the fourth voltage, and the fourth voltage is the output voltage of the external power supply.

[0089] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a method for monitoring the water content of fuel. The method includes: acquiring a detection signal collected by a signal acquisition terminal; determining whether the fuel to be detected contains water based on the detection signal; wherein, when the detection signal is a transistor on signal, the fuel to be detected is determined to contain water; and when the detection signal is a transistor off signal, the fuel to be detected is determined to not contain water. Alternatively, it may include: acquiring the voltage value of the pull-up resistor collected by the signal acquisition terminal; determining the operating state of the fuel water content sensor and whether the fuel to be tested contains water based on the voltage value; wherein, when the voltage value is within a first preset voltage range, the operating state of the fuel water content sensor is determined to be normally connected, and the fuel to be tested does not contain water, the first preset voltage range is a voltage range formed by extending a first preset range based on a first voltage, and the first voltage is the voltage value of the pull-up resistor when the first transistor and / or the second transistor is disconnected; when the voltage value is within a second preset voltage range, the operating state of the fuel water content sensor is determined to be normally connected, and the fuel to be tested contains water, the second preset voltage range is a voltage range formed by extending a second preset range based on a second voltage, and the second voltage is the voltage value of the pull-up resistor when the first transistor and / or the second transistor is disconnected. When the transistor is turned on, the voltage value of the pull-up resistor; when the voltage value is within a third preset voltage range, the working state of the fuel water content sensor is determined to be a connection abnormality, and the type of the connection abnormality is a short circuit to ground of the power interface, a short circuit to ground of the detection signal output interface, or an open circuit of the fuel water content sensor, the third preset voltage range is a voltage range formed by extending the third preset range based on the third voltage, and the third voltage is 0; when the voltage value is within a fourth preset voltage range, the working state of the fuel water content sensor is determined to be a connection abnormality, and the type of the connection abnormality is a short circuit between the power interface and the detection signal output interface or a short circuit between the detection signal output interface and the external power supply, the fourth preset voltage range is a voltage range formed by extending the fourth preset range based on the fourth voltage, and the fourth voltage is the output voltage of the external power supply.

[0090] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0091] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fuel water sensor, characterized by, The application relates to a fuel water content detection device, which comprises the following components: a first transistor (1), a power supply interface (2), a detection signal output interface (3), a first protection resistor (4), a first detection contact (5) and a second detection contact (6); the first detection contact (5) and the second detection contact (6) are arranged at intervals and are used for contacting the fuel to be detected; the base of the first transistor (1) is connected to the first detection contact (5), the collector of the first transistor (1) is connected to the second detection contact (6) and the power supply interface (2) respectively, and the emitter of the first transistor (1) is connected to the detection signal output interface (3) through the first protection resistor (4); when the power supply interface (2) is connected to an external power supply (7) and the detection signal output interface (3) is connected to a signal acquisition terminal (8), if the fuel to be detected contains water, a current that makes the collector of the first transistor (1) and the emitter of the first transistor (1) conductive is generated between the first detection contact (5) and the second detection contact (6), and the signal acquisition terminal (8) acquires a transistor conduction signal from the detection signal output interface (3); the device further comprises a second transistor (9), a second protection resistor (10) and a third detection contact (11) arranged at intervals with the first detection contact (5) and the second detection contact (6); the base of the second transistor (9) is connected to the first detection contact (5), the collector of the second transistor (9) is connected to the third detection contact (11) and the detection signal output interface (3) respectively, the emitter of the second transistor (9) is connected to the power supply interface (2) through the second protection resistor (10), and diodes are connected in series to the second detection contact (6) and the third detection contact (11); when the power supply interface (2) is connected to an external power supply (7) and the detection signal output interface (3) is connected to a signal acquisition terminal (8), if the fuel to be detected contains water, a current that makes the collector of the first transistor (1) and the emitter of the first transistor (1) conductive is generated between the first detection contact (5) and the second detection contact (6), and the signal acquisition terminal (8) acquires a transistor conduction signal from the detection signal output interface (3), and when the power supply interface (2) is connected to the signal acquisition terminal (8) and the detection signal output interface (3) is connected to the external power supply (7), if the fuel to be detected contains water, a current that makes the collector of the second transistor (9) and the emitter of the second transistor (9) conductive is generated between the first detection contact (5) and the third detection contact (11), and the signal acquisition terminal (8) acquires the transistor conduction signal from the power supply interface (2).

2. The fuel water sensor of claim 1, wherein, The device further comprises a voltage dividing resistor (14). The voltage dividing resistor (14) is connected between the power supply interface (2) and the detection signal output interface (3), and is used for voltage division for a pull-up resistor (15) connected to the signal acquisition terminal (8), so as to determine the working state of the fuel water sensor and whether the fuel to be detected contains water based on the voltage value of the pull-up resistor (15), the working state including normal connection, abnormal connection, and the type of abnormal connection.

3. A method of monitoring water content of fuel oil based on the water-in-fuel sensor according to claim 1, characterized by, It comprises: acquiring the detection signal collected by the signal acquisition terminal; based on the detection signal, determine whether the fuel to be detected contains water; wherein, when the detection signal is a transistor conduction signal, it is determined that the fuel to be detected contains water; when the detection signal is a transistor off signal, it is determined that the fuel to be detected does not contain water.

4. A method of monitoring water content of fuel oil based on the water-in-fuel sensor according to claim 2, characterized by, It comprises: acquiring the voltage value of the pull-up resistor collected by the signal acquisition terminal; based on the voltage value, determine the working state of the fuel water sensor and whether the fuel to be detected contains water; wherein, when the voltage value is in a first preset voltage range, it is determined that the working state of the fuel water sensor is normal connection, and the fuel to be detected does not contain water, the first preset voltage range is a voltage range formed by extending a first preset range based on a first voltage, and the first voltage is the voltage value of the pull-up resistor when the first transistor and the second transistor are off; when the voltage value is in a second preset voltage range, it is determined that the working state of the fuel water sensor is normal connection, and the fuel to be detected contains water, the second preset voltage range is a voltage range formed by extending a second preset range based on a second voltage, and the second voltage is the voltage value of the pull-up resistor when the first transistor or the second transistor is on; when the voltage value is in a third preset voltage range, it is determined that the working state of the fuel water sensor is abnormal connection, and the type of abnormal connection is power supply interface to ground short circuit, detection signal output interface to ground short circuit or open circuit of the fuel water sensor, the third preset voltage range is a voltage range formed by extending a third preset range based on a third voltage, and the third voltage is 0; when the voltage value is in a fourth preset voltage range, it is determined that the working state of the fuel water sensor is the connection abnormality, and the type of the connection abnormality is that the power supply interface and the detection signal output interface are shorted with each other or that the detection signal output interface is shorted with an external power supply, the fourth preset voltage range is a voltage range formed by extending a fourth preset range based on a fourth voltage, and the fourth voltage is the output voltage of the external power supply.

5. An internal combustion engine characterized by comprising: The internal combustion engine is provided with the fuel water sensor according to any one of claims 1 to 2.

6. An engine ECU characterized by The engine ECU provides an external power supply for the fuel water sensor according to any one of claims 1 to 2, and collects the detection signal of the fuel water sensor.

7. The engine ECU according to claim 6, characterized in that, The engine ECU further comprises a pull-up resistor.

8. A vehicle characterized by comprising: The vehicle comprises the engine ECU according to claim 6 or 7, and the fuel water sensor according to any one of claims 1 to 2 or the internal combustion engine according to claim 5.

9. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor implements the fuel water content monitoring method as claimed in claim 3 or 4 when executing the program.

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