阅读说明：本技术 油液压力监测电路、油位监测电路以及油位监测装置 (Oil pressure monitoring circuit, oil level monitoring circuit and oil level monitoring device ) 是由 侍书画 朱春明 刘兆萄 于 2020-06-11 设计创作，主要内容包括：本发明公开了一种油液压力监测电路、油位监测电路以及油位监测装置,其中,油液压力监测电路,包括：电源管理电路,用于与电源连接；所述气压传感器,与所述电源管理模块连接,包括第一气压监测单元,设置在油箱内部,用于监测油箱内液体压力；数据传输模块,与所述压力监测模块连接,用于将所述内部气压和所述外部气压传输至计算模块,以使所述计算模块基于所述内部气压和所述外部气压计算所述油液压力。气压传感器测量油液深度可以利用其分辨率精度高的特点,精确的测量油液底部压强,利用油品密度,计算油液高度,可以精确的测得油位。(The invention discloses an oil pressure monitoring circuit, an oil level monitoring circuit and an oil level monitoring device, wherein the oil pressure monitoring circuit comprises: the power supply management circuit is used for being connected with a power supply; the air pressure sensor is connected with the power management module, and comprises a first air pressure monitoring unit, a second air pressure monitoring unit and a control unit, wherein the first air pressure monitoring unit is arranged in the oil tank and used for monitoring the liquid pressure in the oil tank; and the data transmission module is connected with the pressure monitoring module and used for transmitting the internal air pressure and the external air pressure to the calculation module so that the calculation module calculates the oil pressure based on the internal air pressure and the external air pressure. The air pressure sensor can accurately measure the bottom pressure of the oil by utilizing the characteristic of high resolution precision of the air pressure sensor, and the oil level can be accurately measured by utilizing the density of the oil and calculating the height of the oil.)

1. An oil pressure monitoring circuit, comprising:

the power supply management circuit is used for being connected with a power supply;

the air pressure sensor is connected with the power management module, and comprises a first air pressure monitoring unit, a second air pressure monitoring unit and a control unit, wherein the first air pressure monitoring unit is arranged in the oil tank and used for monitoring the liquid pressure in the oil tank;

and the data transmission module is connected with the pressure monitoring module and used for transmitting the internal air pressure and the external air pressure to the calculation module so that the calculation module calculates the oil pressure based on the internal air pressure and the external air pressure.

2. The oil pressure monitoring circuit of claim 1, wherein the pressure monitoring module comprises:

the LPS27HHW air pressure sensor is provided with a third pin, a fifth pin, a ninth pin and an eleventh pin which are connected with low level;

and a tenth pin of the air pressure sensor is connected with the power supply module, and a filter capacitor is arranged between the tenth pin and the eighth pin.

3. The oil hydraulic pressure monitoring circuit according to claim 2, wherein the first pin of the air pressure sensor is connected with the second pin through a first resistor, and the first pin is connected with the fourth pin through a second resistor.

4. The oil pressure monitoring circuit of claim 1, wherein the air pressure sensor further comprises a temperature monitoring unit for monitoring the oil temperature in the mailbox and performing temperature compensation on the measured value of the internal air pressure based on the oil temperature.

5. The oil pressure monitoring circuit according to claim 1, wherein the air pressure sensor further comprises a second air pressure monitoring unit disposed inside the oil tank and being in non-contact with the oil for detecting the air pressure inside the oil tank.

6. The oil pressure monitoring circuit according to claim 5, wherein the air pressure sensor further comprises a third air pressure monitoring unit disposed outside the oil tank for detecting the atmospheric pressure outside the oil tank.

7. The oil pressure monitoring circuit according to any one of claims 1-6, wherein the power management circuit comprises: the power supply module comprises a power supply interface, a short-circuit protection module, a voltage reduction module and a filtering module;

the power interface is connected with the short-circuit protection module, and the voltage reduction module is connected with the short-circuit protection module and used for reducing the first direct-current voltage accessed by the power interface and outputting a second direct-current voltage; the filtering module is connected between the voltage reduction module and the short-circuit protection module, and/or is connected to the output end of the voltage reduction module.

8. The oil pressure monitoring circuit of claim 7, wherein the protection module comprises: and the self-recovery fuse is connected between the power interface and the voltage reduction module in series.

9. An oil level monitoring circuit, comprising

The oil pressure monitoring circuit according to any one of claims 1 to 8.

10. An oil level monitoring device comprising the oil level monitoring circuit of claim 9.

Technical Field

The invention relates to the technical field of circuits, in particular to an oil pressure monitoring circuit, an oil level monitoring circuit and an oil level monitoring device.

Background

The fuel level monitoring is the actual need of engineering machinery equipment, designs a high-tech product of research and development, and functions such as collection oil level collection, data analysis, bluetooth data transmission, simple to operate are integrated, can carry out real-time monitoring and analysis to equipment oil consumption process, and it is applicable to trades such as commodity circulation, engineering machinery and uses in various transportation or construction environment, is the indispensable monitoring devices of engineering machinery.

Disclosure of Invention

The invention mainly aims to provide an oil pressure monitoring circuit, which solves the problem of how to monitor the oil level,

in order to achieve the above object, according to a first aspect of the present invention, there is provided an oil pressure monitoring circuit comprising: the power supply management circuit is used for being connected with a power supply; the air pressure sensor is connected with the power management module, and comprises a first air pressure monitoring unit, a second air pressure monitoring unit and a control unit, wherein the first air pressure monitoring unit is arranged in the oil tank and used for monitoring the liquid pressure in the oil tank; and the data transmission module is connected with the pressure monitoring module and used for transmitting the internal air pressure and the external air pressure to the calculation module so that the calculation module calculates the oil pressure based on the internal air pressure and the external air pressure.

Optionally, the pressure monitoring module comprises: the LPS27HHW air pressure sensor is provided with a third pin, a fifth pin, a ninth pin and an eleventh pin which are connected with low level; and a tenth pin of the air pressure sensor is connected with the power supply module, and a filter capacitor is arranged between the tenth pin and the eighth pin.

Optionally, a first pin of the air pressure sensor is connected to a second pin through a first resistor, and the first pin is connected to a fourth pin through a second resistor.

Optionally, the air pressure sensor further includes a temperature monitoring unit, configured to monitor a temperature of the oil in the mailbox, and perform temperature compensation on the measured value of the internal air pressure based on the temperature of the oil.

Optionally, the air pressure sensor further comprises a second air pressure monitoring unit, which is arranged inside the oil tank, is in non-contact with the oil product, and is used for detecting the air pressure inside the oil tank.

Optionally, the air pressure sensor further includes a third air pressure monitoring unit, which is disposed outside the oil tank and is configured to detect the atmospheric pressure outside the oil tank.

Optionally, the power management circuit comprises: the power supply module comprises a power supply interface, a short-circuit protection module, a voltage reduction module and a filtering module; the power interface is connected with the short-circuit protection module, and the voltage reduction module is connected with the short-circuit protection module and used for reducing the first direct-current voltage accessed by the power interface and outputting a second direct-current voltage; the filtering module is connected between the voltage reduction module and the short-circuit protection module, and/or is connected to the output end of the voltage reduction module.

Optionally, the protection module comprises: and the self-recovery fuse is connected between the power interface and the voltage reduction module in series.

According to a second aspect, an embodiment of the present invention provides an oil level monitoring circuit, including the oil pressure monitoring circuit according to any one of the first aspect.

According to a third aspect, an embodiment of the present invention provides an oil level monitoring device, which is characterized by comprising the oil level monitoring circuit of the second aspect

Oil pressure monitoring circuit includes: the power supply management circuit is used for being connected with a power supply; the air pressure sensor is connected with the power management module, and comprises a first air pressure monitoring unit, a second air pressure monitoring unit and a control unit, wherein the first air pressure monitoring unit is arranged in the oil tank and used for monitoring the liquid pressure in the oil tank; and the data transmission module is connected with the pressure monitoring module and used for transmitting the internal air pressure and the external air pressure to the calculation module so that the calculation module calculates the oil pressure based on the internal air pressure and the external air pressure. The air pressure sensor can accurately measure the bottom pressure of the oil by utilizing the high-precision characteristic of the resolution ratio of the air pressure sensor, and the oil level can be accurately measured by utilizing the density of the oil and calculating the height of the oil.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a modular schematic diagram of a fluid pressure monitoring circuit according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a barometric pressure sensor circuit of an oil pressure monitoring circuit according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the circuit principle of the data transmission module of the oil pressure monitoring circuit according to the embodiment of the invention;

FIG. 4 is a schematic circuit diagram of a memory module of the oil pressure monitoring circuit according to an embodiment of the present invention;

FIG. 5 is a schematic circuit diagram of a power management module of the oil pressure monitoring circuit according to an embodiment of the invention;

FIG. 6 is a schematic diagram of a vibration sensor circuit of the oil pressure monitoring circuit according to an embodiment of the present invention;

fig. 7 is a schematic circuit diagram of a state monitoring module of the oil pressure monitoring circuit according to the embodiment of the invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "center", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The embodiment of the invention provides an oil pressure monitoring circuit, as shown in fig. 1, comprising: a power management circuit 10 for connecting to a power supply; the air pressure sensor 20 is connected with the power management module, and comprises a first air pressure monitoring unit which is arranged in the oil tank and used for monitoring the liquid pressure in the oil tank; and the data transmission module 30 is connected with the pressure monitoring module and is used for transmitting the internal air pressure and the external air pressure to the calculation module so that the calculation module calculates the oil pressure based on the internal air pressure and the external air pressure. In the present embodiment, as shown in fig. 2, the air pressure sensor 20 may include an LPS27HHW air pressure sensor 20, wherein the third pin, the fifth pin, the ninth pin, and the eleventh pin are connected to a low level; a tenth pin of the air pressure sensor 20 is connected to the power module, and a filter capacitor is disposed between the tenth pin and the eighth pin. In the embodiment, the air pressure sensor 20 can be placed at the bottom of the oil tank by utilizing the characteristic of high resolution and high precision of the oil liquid depth, the pressure at the bottom of the oil liquid can be accurately measured, the oil level can be accurately measured by utilizing the density of the oil product and calculating the height of the oil liquid. Specifically, as shown in fig. 3, the data transmission module 30 may include a radio frequency controller, specifically, a bluetooth chip, and the bluetooth chip is connected to the air pressure sensor 20, and may transmit the air pressure sensor 20 to an external computing device through bluetooth, so as to calculate the oil pressure through the external computing device. Specifically, the bluetooth chip may adopt a CC2640R2FRGZ chip.

As an exemplary embodiment, the air pressure sensor 20 further comprises a temperature monitoring unit for monitoring the temperature of the oil in the oil tank and performing temperature compensation on the measured value of the liquid pressure based on the oil temperature. In this embodiment, a plurality of pressure sensors 20 may be included, wherein one pressure sensor 20 is disposed in the oil tank and is in contact with the oil, for example, may be disposed at the bottom of the oil tank, and another pressure sensor 20 is disposed in the oil tank and is not in contact with the oil, for example, may be disposed at the top of the oil tank or at the oil filling port, and is used for measuring the pressure inside the oil tank, due to the evaporation of the gasoline inside the oil tank, the pressure inside the oil tank increases, which may result in a larger measured value of the sensor for measuring the oil pressure at the bottom of the oil tank, and therefore, the measured hydraulic pressure inside the mailbox may be corrected by the pressure inside the oil tank, for example, the measured hydraulic pressure inside the mailbox may be P1 with the standard atmospheric pressure, P2 with the measured oil pressure being P3, and the: P-P3- (P2-P1). And finally obtaining an accurate value of the hydraulic pressure of the oil tank.

In this embodiment, can also set up a baroceptor 20 in the oil tank outside, through the outside atmospheric pressure of real-time supervision oil tank, combine the inside atmospheric pressure of oil tank, the actual oil pressure of oil tank can be more accurate to the actual oil pressure of obtaining in the actual oil tank of actual oil pressure of actual oil tank in the actual oil pressure of actual oil tank. Specifically, the atmospheric pressure measured by the externally disposed air pressure sensor 20 is P11, the air pressure inside the mailbox is P2, and the measured oil pressure is P3, then the actual oil pressure P should be calculated as: P-P3- (P2-P11).

As an exemplary embodiment, the oil level monitoring circuit of fig. 4 may further include a storage module 40 for storing the monitoring data when the rf controller is interrupted. Specifically, the memory module 40 may adopt an MX25R8035F memory chip.

As an exemplary embodiment, as shown in fig. 5, the power management module 10 includes: the power supply comprises a power supply interface, a short-circuit protection module 11, a voltage reduction module 12 and a filtering module 13;

the power interface is connected with the short-circuit protection module 11, and the voltage reduction module 12 is connected with the short-circuit protection module 11 and is configured to reduce a first direct-current voltage accessed by the power interface and output a second direct-current voltage; the filtering module 13 is connected between the voltage reduction module 12 and the short-circuit protection module 11, and/or is connected to an output end of the voltage reduction module 12. As shown in fig. 5, the short-circuit protection module pack 11 includes: and the self-recovery fuse is connected between the power interface and the voltage reduction module in series. The short-circuit protection module 11 further includes: and the anode of the transient diode is connected with the cathode of the power supply and is grounded, and the cathode of the transient diode is connected with the anode of the power supply through the circuit protection module. The filtering module 13 includes: at least one filter capacitor disposed between an input of the voltage reduction module and ground and/or between an output of the voltage reduction module and ground. As shown in fig. 5, the buck module includes a TPS62740 buck converter. The first pin of the chip is connected with a voltage input end to input 3.6V first direct current voltage, the twelfth pin of the chip is connected with a high level, the eighth pin, the ninth pin, the tenth pin and the eleventh pin of the chip are connected with a low level, and the fifth pin of the chip is connected with a voltage output end to output 1.8V second direct current voltage. The power interface is used for being connected with the lithium sub-battery. The 3.6V voltage output by the battery is reduced to 1.8V through the voltage reduction module, and the energy consumption of the whole circuit can be reduced under the condition that the voltage is reduced and the current is unchanged. In the present embodiment, a high-capacity lithium subcell is used as the battery. In this embodiment, the method may further include: and the voltage monitoring module is used for being connected with a power supply, monitoring the power supply voltage and transmitting the power supply voltage to the radio frequency controller.

The embodiment of the invention provides an oil level monitoring circuit, which comprises the oil pressure monitoring circuit in any one of the embodiments; the vibration sensor U4 shown in fig. 6 is connected to the power management module 10, is disposed on the equipment where the oil tank is located, and is configured to monitor a vibration signal of the equipment; when the oil tank is stolen, the oil tank or equipment must vibrate, the vibration signal can be monitored through vibration, and whether the vibration is abnormal or not can be calculated based on the vibration signal. And the monitoring data of the air pressure sensor 20, such as the oil level descending speed, can be combined to realize the monitoring of the oil tank, for example, whether the oil is stolen or whether the oil consumption is normal can be monitored. As shown in fig. 7, the oil level monitoring circuit further includes: and the state monitoring module Q15 is connected with the vibration sensor U4 and is used for monitoring the plugging state of the vibration sensor U4. In this embodiment, the state monitoring module Q15 may perform state monitoring based on a hall device, and after the sensor U4 outside the oil tank is removed, a removal signal may be uploaded to the rf controller through the hall device.

The embodiment of the invention provides an oil level monitoring device, which is provided with the oil level monitoring circuit, and can also adopt a high-capacity lithium sub-battery to supply power for the oil level monitoring device.

Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.