Oil mass detection circuit and oil mass detection equipment

Abstract

The utility model provides an oil mass detection circuit and oil mass detection equipment. The oil mass detection circuit comprises an oil tank voltage division circuit and a first power supply circuit, the oil tank voltage division circuit comprises a first resistor, a sixth resistor and an eighth resistor, one end of the first resistor is a voltage acquisition end of the oil tank voltage division circuit and is connected with a level detector in the oil tank; the other end of the first resistor is a voltage output end of the oil tank voltage division circuit; the other end of the first resistor is also connected with one end of the eighth resistor; the other end of the eighth resistor is connected with the power supply output end of the first power supply circuit; the other end of the eighth resistor is also connected with one end of a sixth resistor; the other end of the sixth resistor is a voltage reference end of the oil tank voltage division circuit; according to the scheme, the voltage change caused by the resistance change brought by the level sensor can be accurately obtained only by matching the plurality of resistors and the triodes with the level detector in the oil tank, so that the accurate measurement of the oil quantity in the oil tank is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit detection technical field especially, it is an oil quantity detection circuit and oil quantity detection equipment. BACKGROUND

[0002] For the vehicle with fuel as energy, accurate fuel detection has important significance. Fuel detection is mainly realized through the change of oil level in the tank by horizontal sensor, these sensors usually work based on float principle, and the float moves up and down with the change of oil level, thereby the resistance of connected variable resistor is changed, and the resistance change is converted into electric signal to display the oil quantity, so the oil quantity detection circuit is often designed more complex. SUMMARY

[0003] Therefore, the utility model discloses a kind of oil quantity detection circuit and oil quantity detection equipment, only several resistors and triode are cooperated with horizontal detector in oil tank, voltage change caused by resistance change brought by horizontal sensor can be accurately obtained, to realize accurate measurement to oil quantity in oil tank, reduce the complexity of oil quantity detection circuit in prior art.

[0004] In a first aspect, the utility model provides an oil quantity detection circuit, which comprises: an oil tank voltage dividing circuit and a first power supply circuit.

[0005] The oil tank voltage dividing circuit comprises: a first resistor R1, a sixth resistor R6 and an eighth resistor R8. One end of the first resistor R1 is connected to the voltage collection end of the oil tank voltage dividing circuit and the horizontal detector in the oil tank. The other end of the first resistor R1 is the voltage output end of the oil tank voltage dividing circuit. The other end of the first resistor R1 is also connected to one end of the eighth resistor R8. The other end of the eighth resistor R8 is connected to the power supply output end of the first power supply circuit. The other end of the eighth resistor R8 is also connected to one end of the sixth resistor R6. The other end of the sixth resistor R6 is the voltage reference end of the oil tank voltage dividing circuit.

[0006] The first power supply circuit comprises: a first triode Q2 and a fourth resistor R4. The emitter of the first triode Q2 inputs the first power supply voltage. The collector of the first triode Q2 is connected to the other end of the eighth resistor R8 as the power supply output end of the first power supply circuit. The base of the first triode Q2 is grounded. One end of the fourth resistor R4 is connected to the base of the first triode Q2. The other end of the fourth resistor is connected to the emitter of the first triode Q2.

[0007] Optionally, the oil quantity detection circuit further comprises a second power supply circuit. The power supply output end of the second power supply circuit is connected to the base of the first triode Q2.

[0008] The second power supply circuit comprises a second triode Q1 and a fifth resistor R5; the base of the second triode Q1 is inputted with the second power supply voltage; the emitter of the second triode Q1 is grounded; and the collector of the second triode Q1 is connected with the base of the first triode Q2 through the fifth resistor R5.

[0009] Optionally, the second power supply circuit further comprises a second resistor R2 and a third resistor R3; one end of the second resistor R2 is inputted with the second power supply voltage; the other end of the second resistor R2 is connected with the base of the second triode Q1;

[0010] The other end of the third resistor R3 is grounded.

[0011] Optionally, the second power supply circuit further comprises a first capacitor C1; one end of the first capacitor C1 is connected with the base of the second triode Q1; and the other end of the first capacitor C1 is grounded.

[0012] Optionally, the oil tank voltage dividing circuit further comprises a seventh resistor R7 and a sixth capacitor C6; one end of the seventh resistor R7 is connected with the other end of the first resistor R1; and the other end of the seventh resistor R7 is a voltage output end of the oil tank voltage dividing circuit;

[0013] One end of the sixth capacitor C6 is connected with the other end of the seventh resistor R7; and the other end of the sixth capacitor C6 is grounded.

[0014] Optionally, the oil tank voltage dividing circuit further comprises a second capacitor C2; one end of the second capacitor C2 is connected with the other end of the eighth resistor R8 and the collector of the first triode Q2 respectively; and the other end of the second capacitor C2 is grounded.

[0015] Optionally, the oil tank voltage dividing circuit further comprises a fifth capacitor C5; one end of the fifth capacitor C5 is connected with the other end of the sixth resistor R6; and the other end of the fifth capacitor C5 is grounded.

[0016] Optionally, the oil tank voltage dividing circuit further comprises a first diode D1; the negative electrode of the first diode D1 is connected with the other end of the eighth resistor R8; and the positive electrode of the first diode D1 is grounded.

[0017] Optionally, the first power supply circuit further comprises a third capacitor C3 and a fourth capacitor C4; the capacitance value of the third capacitor C3 is greater than that of the fourth capacitor C4.

[0018] One end of the third capacitor C3 is connected with the emitter of the first triode Q2; and the other end of the third capacitor C3 is grounded.

[0019] One end of the fourth capacitor C4 is connected with the emitter of the first triode Q2; and the other end of the fourth capacitor C4 is grounded.

[0020] In a second aspect, the utility model discloses a kind of oil quantity detection equipment, which comprises: MCU controller and the oil quantity detection circuit mentioned in the first aspect above;

[0021] The first detection pin of the MCU controller is connected with the voltage output end of the oil tank voltage dividing circuit in the oil quantity detection circuit.

[0022] The second detection pin of the MCU controller is connected with the voltage reference end of the oil tank voltage dividing circuit in the oil quantity detection circuit.

[0023] The utility model discloses a kind of oil quantity detection circuit and oil quantity detection equipment, which comprises: oil tank voltage dividing circuit and first power supply circuit;Wherein, the oil tank voltage dividing circuit includes: first resistance, sixth resistance and eighth resistance;One end of the first resistance is the voltage acquisition end of the oil tank voltage dividing circuit and is connected with the level detector in oil tank;The other end of the first resistance is the voltage output end of the oil tank voltage dividing circuit;The other end of the first resistance is also connected with one end of the eighth resistance;The other end of the eighth resistance is connected with the power supply output end of the first power supply circuit;The other end of the eighth resistance is also connected with one end of the sixth resistance;The other end of the sixth resistance is the voltage reference end of the oil tank voltage dividing circuit.The oil quantity detection circuit uses the level detector in oil tank as variable resistor, voltage change caused by resistance change can be acquired by the voltage acquisition end of the oil tank voltage dividing circuit, and the voltage of the voltage acquisition end is monitored by the voltage value of the voltage output end and the voltage reference end of the oil tank voltage dividing circuit, to realize the accurate detection of oil quantity.Obviously, the scheme only needs several resistors and triodes to cooperate with the level detector in oil tank, so as to accurately acquire the voltage change caused by resistance change of level sensor, to realize accurate measurement of oil quantity in oil tank, and reduce the complexity of the oil quantity detection circuit in the prior art.

[0024] Other features and advantages of the present utility model will be set forth in the following description of the application, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present utility model. The objects and other advantages of the present utility model will be realized and achieved by means of the structures particularly pointed out in the description, claims and drawings.

[0025] In order to make the above-mentioned purposes, features and advantages of the present utility model more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0027] Figure 1 A structural schematic diagram of an oil amount detection circuit provided by the embodiment of the present application is shown in the figure.

[0028] Figure 2 A structural schematic diagram of another oil amount detection circuit provided by the embodiment of the present application is shown in the figure.

[0029] Figure 3 A structural schematic diagram of an oil amount detection device provided by the embodiment of the present application is shown in the figure.

[0030] Icon:

[0031] R1-first resistor; R2-second resistor; R3-third resistor; R4-fourth resistor; R5-fifth resistor; R6-sixth resistor; R7-seventh resistor; R8-eighth resistor;

[0032] Q1-second triode; Q2-first triode; D1-first diode;

[0033] C1-first capacitor; C2-second capacitor; C3-third capacitor; C4-fourth capacitor; C5-fifth capacitor; C6-sixth capacitor. Specific embodiments

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the present application will be described clearly and completely in combination with embodiments. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0035] In the era of coexistence of traditional fuel vehicles and extended-range vehicles, accurate detection of the fuel quantity of a vehicle is still of great significance. The fuel quantity detection is mainly achieved by detecting the change of the fuel level through a fuel quantity sensor. The sensor usually works on the principle of a float, which moves up and down with the change of the fuel level, thereby changing the resistance value of the connected variable resistor. The change of the resistance value is converted into an electric signal, which is used to display the fuel quantity. The fuel quantity detection circuit not only can display the current fuel quantity, but also can send an audible and visual alarm signal when the fuel quantity decreases below the safety line, reminding the driver to refuel in time to avoid vehicle failure or traffic accidents caused by insufficient fuel quantity. In addition, some advanced fuel quantity detection circuits can also be connected through a GPS positioning terminal to realize remote monitoring and alarm functions, which are very effective for preventing fuel stealing.

[0036] As can be seen, the fuel quantity detection of a vehicle plays an important role in ensuring the normal operation and driving safety of the vehicle. It not only improves the convenience of driving, but also enhances the intelligent level of vehicle management. In terms of circuit design, the fuel quantity detection circuit usually has a complex voltage stabilizing circuit, a fuel level display circuit, and a low fuel warning circuit, etc. Precise resistance measurement and voltage comparison are achieved through these circuits to ensure the accuracy of the fuel quantity display and prevent the display result from being affected by the fluctuation of the fuel level during vehicle driving. Therefore, the fuel quantity detection circuit is often designed to be complex.

[0037] Based on this, the utility model provides a kind of fuel quantity detection circuit and fuel quantity detection equipment, only several resistors and triode are cooperated with the level detector in fuel tank, the voltage change caused by the resistance change of level sensor can be accurately obtained, thereby realizing accurate measurement of the fuel quantity in fuel tank, reduce the complexity of fuel quantity detection circuit in prior art.

[0038] For the convenience of understanding this embodiment, first, a kind of fuel quantity detection circuit disclosed by the utility model embodiment is introduced in detail, as shown in Figure 1 The fuel quantity detection circuit includes a fuel tank voltage dividing circuit and a first power supply circuit.

[0039] The fuel tank voltage dividing circuit includes a first resistor R1, a sixth resistor R6 and an eighth resistor R8. One end of the first resistor R1 is connected to the voltage collection end of the fuel tank voltage dividing circuit and the level detector in the fuel tank. The other end of the first resistor R1 is the voltage output end of the fuel tank voltage dividing circuit. The other end of the first resistor R1 is also connected to one end of the eighth resistor R8. The other end of the eighth resistor R8 is connected to the power supply output end of the first power supply circuit. The other end of the eighth resistor R8 is also connected to one end of the sixth resistor R6. The other end of the sixth resistor R6 is the voltage reference end of the fuel tank voltage dividing circuit.

[0040] The first power supply circuit comprises a first triode Q2 and a fourth resistor R4; an emitter of the first triode Q2 inputs a first power supply voltage; a collector of the first triode Q2 is connected with the other end of an eighth resistor R8 as a power supply output end of the first power supply circuit; a base of the first triode Q2 is grounded; one end of the fourth resistor R4 is connected with the base of the first triode Q2; the other end of the fourth resistor is connected with the emitter of the first triode Q2.

[0041] Figure 1 The FUEL_SENSOR in the formula connects a level detector of an automobile oil tank, and the level detector is a float-controlled float potentiometer system connected with an instrument panel fuel gauge; when the oil tank is full of fuel, a float arm is lifted, the resistance of the potentiometer is changed, and the pointer of the fuel gauge is deflected to the full scale; when the fuel level in the oil tank is lowered, the resistance of the variable resistor is adjusted to be higher (or lower), the current flowing through the system circuit is changed, and the reading of the pointer of the fuel gauge is also changed.

[0042] According to the principle, the change of the fuel in the oil tank of the automobile can be regarded as a sliding rheostat, the voltage value is collected through a voltage collection end of an oil tank voltage dividing circuit, a first resistor R1 and an eighth resistor R8 form a series resistance voltage dividing application with a voltage output end of the oil tank voltage dividing circuit. The first triode Q2 in the first power supply circuit is a common switching triode, which is finally connected with a voltage reference end through the fourth resistor R4. The voltage of the voltage collection end is monitored through the voltage values of the voltage output end of the oil tank voltage dividing circuit and the voltage reference end, so that the accurate detection of the fuel quantity is realized.

[0043] As shown in another fuel quantity detection circuit shown in Figure 2 Optionally, the fuel quantity detection circuit further comprises a second power supply circuit; a power supply output end of the second power supply circuit is connected with the base of the first triode Q2; wherein the second power supply circuit comprises a second triode Q1 and a fifth resistor R5; a base of the second triode Q1 inputs a second power supply voltage; an emitter of the second triode Q1 is grounded; a collector of the second triode Q1 is connected with the base of the first triode Q2 through the fifth resistor R5.

[0044] Optionally, the second power supply circuit further comprises a second resistor R2 and a third resistor R3; wherein one end of the second resistor R2 inputs the second power supply voltage; the other end of the second resistor R2 is connected with the base of the second triode Q1; one end of the third resistor R3 is connected with the base of the second triode Q1; the other end of the third resistor R3 is grounded.

[0045] Optionally, the second power supply circuit further comprises a first capacitor C1; wherein one end of the first capacitor C1 is connected with the base of the second triode Q1; the other end of the first capacitor C1 is grounded.

[0046] Optionally, the oil tank voltage dividing circuit further comprises a seventh resistor R7 and a sixth capacitor C6; one end of the seventh resistor R7 is connected with the other end of the first resistor R1; the other end of the seventh resistor R7 is the voltage output end of the oil tank voltage dividing circuit; one end of the sixth capacitor C6 is connected with the other end of the seventh resistor R7, and the other end of the sixth capacitor C6 is grounded.

[0047] Optionally, the oil tank voltage dividing circuit further comprises a second capacitor C2; one end of the second capacitor C2 is connected with the other end of the eighth resistor R8 and the collector of the first triode Q2 respectively; and the other end of the second capacitor C2 is grounded.

[0048] Optionally, the oil tank voltage dividing circuit further comprises a fifth capacitor C5; one end of the fifth capacitor C5 is connected with the other end of the sixth resistor R6; and the other end of the fifth capacitor C5 is grounded.

[0049] Optionally, the oil tank voltage dividing circuit further comprises a first diode D1; the negative electrode of the first diode D1 is connected with the other end of the eighth resistor R8; and the positive electrode of the first diode D1 is grounded.

[0050] Optionally, the first power supply circuit further comprises a third capacitor C3 and a fourth capacitor C4; the capacitance value of the third capacitor C3 is greater than that of the fourth capacitor C4; one end of the third capacitor C3 is connected with the emitter of the first triode Q2; the other end of the third capacitor C3 is grounded; one end of the fourth capacitor C4 is connected with the emitter of the first triode Q2; and the other end of the fourth capacitor C4 is grounded.

[0051] Figure 2 The oil amount detection circuit in the oil tank voltage dividing circuit regards the change of the oil amount in the automobile oil tank as a slide rheostat, and the slide rheostat FUEL_SENSOR is connected in series with the first resistor R1, the eighth resistor R8 and the seventh resistor R7 to form a series resistance voltage dividing application, wherein the seventh resistor R7 is a protection resistor and does not play a role in voltage dividing; the FUEL_SENSOR_TO_MCU is the voltage output end of the oil tank voltage dividing circuit, and can realize the oil tank oil amount detection by the above series voltage dividing value.

[0052] Figure 2 The second triode Q1 and the first triode Q2 in the oil tank voltage dividing circuit are ordinary switching triodes, and the 3.3V of the first power supply circuit and the 3.3V of the second power supply circuit are finally output to the voltage reference end SYS_3V3_DET_TO_MCU of the oil tank voltage dividing circuit through the fourth resistor R4, the fifth resistor R5, the second resistor R2, the third resistor R3 and the sixth resistor R6, so as to realize the accurate monitoring of the reference voltage of the 3.3V power supply, and the voltage of the voltage output end of the oil tank voltage dividing circuit and the voltage reference end is used to monitor the voltage of the voltage collection end, thereby realizing the accurate detection of the oil amount. Figure 2The first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5 and the sixth capacitor C6 in the oil quantity detection circuit are used for filtering power supply and network port, and the values can be referred to the recommended values shown in the table Figure 2

[0053] The oil quantity detection circuit mentioned in the above embodiment can accurately obtain the voltage change caused by the resistance change of the level sensor, thereby accurately measuring the oil quantity in the oil tank and reducing the complexity of the oil quantity detection circuit in the prior art.

[0054] The oil quantity detection device provided in the embodiment of the utility model, as shown in the figure, comprises an MCU controller and the oil quantity detection circuit mentioned in the above embodiment. Figure 3 The first detection pin of the MCU controller is connected with the voltage output end of the oil tank voltage dividing circuit in the oil quantity detection circuit, and the second detection pin of the MCU controller is connected with the voltage reference end of the oil tank voltage dividing circuit in the oil quantity detection circuit.

[0055] Specifically, Figure 3 The MCU_3V3 in the oil quantity detection circuit is the 3.3V voltage output by the MCU controller, the SYS_3V3 is the system voltage value of the oil quantity detection device, and is also 3.3V; the FUEL_SENSOR_TO_MCU is the voltage output end of the oil tank voltage dividing circuit, is connected with one ADC (high-precision) detection pin of the MCU controller, that is, the first detection pin, can accurately quantify the voltage dividing value corresponding to the FUEL_SENSOR through the ADC detection pin, thereby realizing the oil quantity detection of the oil tank.

[0056] The SYS_3V3_DET_TO_MCU is connected with the second detection pin of the MCU controller as the voltage reference end of the oil tank voltage dividing circuit, the second detection pin is another ADC (high-precision) detection pin of the MCU controller, realizes the accurate monitoring of the reference voltage of the 3V3 power supply of the MCU controller, that is, the accurate monitoring of the MCU ADC detection port, ensures that the external power supply of the MCU controller and the 3V3 reference voltage inside the MCU controller are always accurate, thereby ensuring that the detected oil quantity data is accurate.

[0057] The oil quantity detection device provided in the embodiment of the utility model has the same implementation principle and technical effects as the above-mentioned oil quantity detection circuit embodiment, and for brief description, the part not mentioned in the device embodiment can refer to the corresponding content in the above-mentioned embodiment.

[0058] ​In several embodiments provided in the present application, it should be understood that the disclosed system and device can be implemented in other manners. The above described device embodiments are merely schematic, for example, the division of the units is only a logical function division, and there can be another division manner in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between different units, can be indirect couplings or communication connections through some interfaces, devices or units, and can be electrical, mechanical or in other forms.

[0059] The units described as separated components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments of the present application.

[0060] In addition, each functional unit in the various embodiments of the present application can be integrated into one processing unit, or each unit can exist physically, or two or more units can be integrated into one unit.

[0061] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a non-volatile computer readable storage medium executable by a processor. Based on this understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0062] Finally, it should be noted that the above-described embodiments are merely specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, but not to limit the same, and the protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily think of changes to the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to some of the technical features within the technical range disclosed by the present application. The modifications, changes or replacements do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An oil amount detection circuit characterized by comprising: The oil amount detection circuit comprises an oil tank voltage division circuit and a first power supply circuit; The oil tank voltage division circuit comprises a first resistor (R1), a sixth resistor (R6) and an eighth resistor (R8); one end of the first resistor (R1) is connected with a level detector in the oil tank as a voltage collection end of the oil tank voltage division circuit; the other end of the first resistor (R1) is a voltage output end of the oil tank voltage division circuit; the other end of the first resistor (R1) is also connected with one end of the eighth resistor (R8); the other end of the eighth resistor (R8) is connected with a power supply output end of the first power supply circuit; the other end of the eighth resistor (R8) is also connected with one end of the sixth resistor (R6); the other end of the sixth resistor (R6) is a voltage reference end of the oil tank voltage division circuit; The first power supply circuit comprises a first triode (Q2) and a fourth resistor (R4); an emitter of the first triode (Q2) inputs a first power supply voltage; a collector of the first triode (Q2) is connected with the other end of the eighth resistor (R8) as a power supply output end of the first power supply circuit; a base of the first triode (Q2) is grounded; one end of the fourth resistor (R4) is connected with the base of the first triode (Q2); the other end of the fourth resistor is connected with the emitter of the first triode (Q2).

2. The oil amount detection circuit according to claim 1, characterized by The oil amount detection circuit further comprises a second power supply circuit; a power supply output end of the second power supply circuit is connected with the base of the first triode (Q2); The second power supply circuit comprises a second triode (Q1) and a fifth resistor (R5); a base of the second triode (Q1) inputs a second power supply voltage; an emitter of the second triode (Q1) is grounded; a collector of the second triode (Q1) is connected with the base of the first triode (Q2) through the fifth resistor (R5).

3. The oil amount detection circuit according to claim 2, characterized by The second power supply circuit further comprises a second resistor (R2) and a third resistor (R3); one end of the second resistor (R2) inputs a second power supply voltage; the other end of the second resistor (R2) is connected with the base of the second triode (Q1); One end of the third resistor (R3) is connected with the base of the second triode (Q1); the other end of the third resistor (R3) is grounded.

4. The oil amount detection circuit according to claim 2, characterized by The second power supply circuit further comprises a first capacitor (C1); one end of the first capacitor (C1) is connected with the base of the second triode (Q1); the other end of the first capacitor (C1) is grounded.

5. The oil amount detection circuit according to claim 1, characterized by The oil tank voltage division circuit further comprises a seventh resistor (R7) and a sixth capacitor (C6); one end of the seventh resistor is connected with the other end of the first resistor (R1); the other end of the seventh resistor (R7) is a voltage output end of the oil tank voltage division circuit; One end of the sixth capacitor (C6) is connected with the other end of the seventh resistor (R7); the other end of the sixth capacitor (C6) is grounded.

6. The oil amount detection circuit according to claim 1, characterized by The oil tank voltage dividing circuit further comprises a second capacitor (C2); one end of the second capacitor (C2) is connected with the other end of the eighth resistor (R8) and the collector of the first triode (Q2) respectively; the other end of the second capacitor (C2) is grounded.

7. The oil amount detection circuit according to claim 1, characterized by The oil tank voltage dividing circuit further comprises a fifth capacitor (C5); one end of the fifth capacitor (C5) is connected with the other end of the sixth resistor (R6); the other end of the fifth capacitor (C5) is grounded.

8. The oil amount detection circuit according to claim 1, characterized by The oil tank voltage dividing circuit further comprises a first diode (D1); the negative electrode of the first diode (D1) is connected with the other end of the eighth resistor (R8); the positive electrode of the first diode (D1) is grounded.

9. The oil amount detection circuit according to claim 1, characterized by The first power supply circuit further comprises a third capacitor (C3) and a fourth capacitor (C4); the capacitance value of the third capacitor (C3) is greater than that of the fourth capacitor (C4); one end of the third capacitor (C3) is connected with the emitter of the first triode (Q2); the other end of the third capacitor (C3) is grounded; one end of the fourth capacitor (C4) is connected with the emitter of the first triode (Q2); the other end of the fourth capacitor (C4) is grounded.

10. An oil amount detecting apparatus characterized by comprising: The oil quantity detection device comprises an MCU controller and the oil quantity detection circuit according to any one of claims 1 to 9; one end of the third capacitor (C3) is connected with the emitter of the first triode (Q2); the other end of the third capacitor (C3) is grounded; one end of the fourth capacitor (C4) is connected with the emitter of the first triode (Q2); the other end of the fourth capacitor (C4) is grounded. The oil quantity detection device comprises an MCU controller and the oil quantity detection circuit according to any one of claims 1 to 9; one end of the third capacitor (C3) is connected with the emitter of the first triode (Q2); the other end of the third capacitor (C3) is grounded; one end of the fourth capacitor (C4) is connected with the emitter of the first triode (Q2); the other end of the fourth capacitor (C4) is grounded.

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