CN214007334U

CN214007334U - Fuel system

Info

Publication number: CN214007334U
Application number: CN202022218697.3U
Authority: CN
Inventors: 苗翠婷; 付永刚; 孙宗升; 王永亮; 李凯
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-08-20
Anticipated expiration: 2030-09-29

Abstract

The utility model relates to the technical field of fuel oil systems, in particular to a fuel oil system, wherein a first pressure sensor is arranged at an oil inlet of an oil transfer pump; the second pressure sensor is arranged at an oil outlet of the oil transfer pump; one end of the oil return pipe is communicated with an oil outlet of the oil transfer pump, the other end of the oil return pipe is communicated with an oil inlet of the oil transfer pump, and the oil return pipe is provided with an electromagnetic valve; the controller controls the electromagnetic valve to open or close according to the signal of the second pressure sensor, and the controller controls the alarm to give an alarm according to the signal of the first pressure sensor and the signal of the second pressure sensor. The utility model discloses an among the fuel oil system, according to second pressure sensor's signal control solenoid valve open or close, control solenoid valve opens and switches on back oil pipe, and the fuel of fuel delivery pump flows back to oil inlet department from the oil-out. Meanwhile, the alarm is controlled to alarm according to the signal of the first pressure sensor and the signal of the second pressure sensor, and the fault of the oil delivery pump and the fault of the overflow valve can be reported.

Description

Fuel system

Technical Field

The utility model relates to a fuel oil system technical field, concretely relates to fuel oil system.

Background

The existing oil transfer pump is integrated with an overflow valve, when the pressure reaches a certain value, the overflow valve is opened, an oil outlet channel is communicated with an oil inlet channel, the pressure at the outlet of the oil transfer pump is reduced, fuel oil self-circulates in the oil transfer pump to achieve the purpose of keeping the pressure of the oil outlet of the oil transfer pump constant, if the overflow valve is blocked and cannot be opened, the pressure at the outlet of the oil transfer pump is increased, the pressure can be released only through a one-way throttle valve, but the orifice of the one-way throttle exhaust valve is very small, and if the pressure is too large, the pressure cannot be released, so that a fuel fine filter behind the oil transfer pump can be damaged by bulging or safety accidents can be caused. If the overflow valve is blocked and can not return, the oil inlet and the oil outlet of the oil transfer pump are always communicated, and the pressure behind the oil transfer pump is too low, so that the faults of insufficient oil supply, rail pressure reduction, insufficient power and the like are caused.

At present, the clamping stagnation of an overflow valve of the existing oil delivery pump easily causes the faults of damage of a fuel fine filter or insufficient oil supply and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problem that the overflow valve jamming of the existing oil transfer pump easily causes the damage of the fuel fine filter or the insufficient oil supply and other faults. The purpose is realized by the following technical scheme:

the utility model provides a fuel oil system, including fuel delivery pump and overflow valve, the oil inlet of fuel delivery pump with the oil-out of fuel delivery pump passes through the overflow pipe intercommunication, the overflow valve set up in on the overflow pipe, wherein, fuel oil system still includes:

the first pressure sensor is arranged at an oil inlet of the oil transfer pump;

the second pressure sensor is arranged at an oil outlet of the oil transfer pump;

one end of the oil return pipe is communicated with an oil outlet of the oil transfer pump, the other end of the oil return pipe is communicated with an oil inlet of the oil transfer pump, and an electromagnetic valve is arranged on the oil return pipe;

the controller controls the electromagnetic valve to be opened or closed according to the signal of the second pressure sensor, the controller is connected with the alarm, and the controller controls the alarm to give an alarm according to the signal of the first pressure sensor and the signal of the second pressure sensor.

According to the utility model discloses an among the fuel oil system, set up first pressure sensor, second pressure sensor and solenoid valve, can open or close according to second pressure sensor's signal control solenoid valve, control solenoid valve opens and switches on back oil pipe, and the fuel of fuel delivery pump flows back to oil inlet department from the oil-out, avoids the high fuel fine filter that leads to of pressure to damage. Meanwhile, an alarm is controlled to give an alarm according to the signal of the first pressure sensor and the signal of the second pressure sensor, so that the fault of the oil delivery pump and the fault of the overflow valve can be reported, and personnel can be prompted to repair.

In addition, according to the utility model discloses a fuel oil system still can have following additional technical characterstic:

in some embodiments of the present invention, the fuel system further comprises an oil tank, the oil tank is communicated with the oil inlet of the oil transfer pump, and the end of the oil return pipe is communicated with the oil tank.

In some embodiments of the present invention, the fuel system further comprises a fuel strainer, the fuel strainer being disposed between the fuel tank and the oil inlet of the fuel delivery pump.

In some embodiments of the present invention, the fuel system further comprises a fuel fine filter, the fuel fine filter being in communication with an oil outlet of the fuel delivery pump.

In some embodiments of the present invention, the fuel system further comprises a one-way throttle valve, the one-way throttle valve is communicated with the fuel fine filter and the fuel tank.

In some embodiments of the present invention, the electromagnetic valve is a normally closed two-position two-way valve, the controller closes the normally closed two-position two-way valve, and an oil inlet of the oil transfer pump is communicated with an oil outlet of the oil transfer pump; the controller opens the normally closed two-position two-way valve, and the oil inlet of the oil transfer pump is disconnected with the oil outlet of the oil transfer pump.

The utility model discloses an in some embodiments, be provided with computational element and judgement unit in the controller, computational element is used for calculating first pressure sensor with second pressure sensor's pressure difference value, the judgement unit is used for judging signal difference value and the size of predetermineeing the pressure difference.

In some embodiments of the present invention, the controller is an ECU.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:

FIG. 1 is a schematic structural diagram of a fuel system according to an embodiment of the present invention;

FIG. 2 is a logic control diagram in the fuel system provided by the embodiment of the present invention.

The reference numerals in the drawings denote the following:

1: an oil tank; 2: a fuel oil strainer; 3: an oil transfer pump; 4: an overflow valve; 5: a fuel fine filter; 6: a one-way throttle valve; 7: an injection pump; 8: a common rail pipe; 9: an ECU;

31: a first pressure sensor; 32: a second pressure sensor; 33: an electromagnetic valve.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As shown in fig. 1 and fig. 2, the fuel system in this embodiment includes a fuel delivery pump 3 and an overflow valve 4, an oil inlet of the fuel delivery pump 3 is communicated with an oil outlet of the fuel delivery pump 3 through an overflow pipe, and the overflow valve 4 is disposed on the overflow pipe, wherein the fuel system further includes: a first pressure sensor 31, a second pressure sensor 32, an oil return pipe and a controller; the first pressure sensor 31 is arranged at an oil inlet of the oil transfer pump 3; the second pressure sensor 32 is arranged at an oil outlet of the oil transfer pump 3; one end of the oil return pipe is communicated with an oil outlet of the oil transfer pump 3, the other end of the oil return pipe is communicated with an oil inlet of the oil transfer pump 3, and the oil return pipe is provided with an electromagnetic valve 33; the controller controls the electromagnetic valve 33 to be opened or closed according to the signal of the second pressure sensor 32, is connected with the alarm, and controls the alarm to give an alarm according to the signal of the first pressure sensor 31 and the signal of the second pressure sensor 32.

Specifically, when the overflow valve 4 is stuck and the overflow valve 4 is stuck in a closed state, the overflow valve 4 cannot be opened, the signal value P2 of the second pressure sensor 32 continuously rises, when the signal value P2 is greater than a set value, the controller controls the electromagnetic valve 33 to be switched on, fuel at the oil outlet of the fuel delivery pump 3 flows back to the oil inlet, the signal value P2 falls, the situation that the fuel fine filter 5 is blown out or other safety accidents are caused by overhigh pressure is avoided, and meanwhile, the controller reports out the pressure overrun fault after the fuel delivery pump 3. Because the P2 overrun may also be caused by an excessively high oil inlet pressure of the oil delivery pump 3, it is necessary to determine whether the differential pressure Δ P between the front and rear sides of the oil delivery pump 3 is greater than a set value P2-P1, and if the differential pressure Δ P is greater than the set value, it is determined that the relief valve 4 is stuck, and a stuck fault of the relief valve 4 is reported.

When the overflow valve 4 is stuck and stuck in an opening state of the overflow valve 4, the overflow valve 4 cannot return and close, an oil inlet and an oil outlet of the oil delivery pump 3 are always communicated, and the pressure P2 behind the oil delivery pump 3 may be too low, so that the oil supply is insufficient, the rail pressure is too low, and the power-down engine cannot normally operate, and the pressure P2 is too low and may be caused by other reasons, such as too large pipeline resistance before the oil delivery pump 3, too low atmospheric pressure, and the like, so that whether the pressure difference Δ P between the front and the rear of the oil delivery pump 3 is less than a set value or not needs to be judged, if the pressure difference Δ P is less than the set value, the oil delivery pump 3 is considered to be stuck or the.

In some embodiments of the utility model, the fuel oil system still includes oil tank 1, and oil tank 1 communicates with the oil inlet of fuel delivery pump 3, and the tip that returns the oil pipe communicates with oil tank 1.

The oil output from the oil transfer pump 3 is returned to the oil tank 1, so that the pipeline resistance in front of the oil transfer pump 3 can be better prevented from being too large, and the usability is better.

In some embodiments of the present invention, the fuel system further includes a fuel strainer 2, and the fuel strainer 2 is disposed between the oil tank 1 and the oil inlet of the oil transfer pump 3.

In some embodiments of the present invention, the fuel system further comprises a fuel fine filter 5, and the fuel fine filter 5 is communicated with the oil outlet of the fuel delivery pump 3.

The outlet of the fuel fine filter 5 is communicated with an oil injection pump 7, and the oil injection pump 7 is communicated with a common rail pipe 8.

In some embodiments of the present invention, the fuel system further comprises a one-way throttle valve 6, and the one-way throttle valve 6 is communicated with the fuel fine filter 5 and the fuel tank 1. The provision of the one-way throttle valve 6 facilitates the release of oil at an elevated delivery pump outlet pressure or venting of oil in use in the event of failure of the solenoid valve 33 to open.

In some embodiments of the present invention, the electromagnetic valve 33 is a normally closed two-position two-way valve, the controller closes the normally closed two-position two-way valve, and an oil inlet of the oil transfer pump 3 is communicated with an oil outlet of the oil transfer pump 3; the controller opens the normally closed two-position two-way valve, and the oil inlet of the oil transfer pump 3 is disconnected with the oil outlet of the oil transfer pump 3.

The utility model discloses an in some embodiments, be provided with computational element and judgement unit in the controller, computational element is used for calculating the pressure difference value of first pressure sensor 31 and second pressure sensor 32, and the judgement unit is used for judging the size of pressure difference value and preset pressure differential.

In some embodiments of the present invention, the controller is the ECU 9.

The utility model discloses a when fuel oil system used, through increasing second pressure sensor 32 and solenoid valve 33, can carry out automatic pressure release when the pressure transfinites behind oil transfer pump 3, prevent that the filter from bulging broken trouble and incident, to improving product reliability, reduce loss has great meaning. Increase first pressure sensor 31 and second pressure sensor 32 defeated oil pump 3 front and back pressure differential and judge, can discern defeated oil pump 3 trouble fast, for the time that engine troubleshooting and maintenance saved, promote user experience.

The utility model discloses an among the fuel oil system, set up first pressure sensor 31, second pressure sensor 32 and solenoid valve 33, can open or close according to second pressure sensor 32's signal control solenoid valve 33, control solenoid valve 33 opens and switches on back oil pipe, and the fuel of fuel feed pump 3 flows back to oil inlet department from the oil-out, avoids the high fuel fine filter 5 that leads to of pressure to damage. Meanwhile, the alarm is controlled to alarm according to the signal of the first pressure sensor 31 and the signal of the second pressure sensor 32, so that the fault of the oil delivery pump 3 and the fault of the overflow valve 4 can be reported, and personnel can be prompted to repair.

It should be noted that, in the embodiment of the present invention, the portions of the fuel system that are not involved are all the same as or can be implemented by using the prior art, and thus are not described herein repeatedly.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a fuel oil system, includes oil transfer pump and overflow valve, the oil inlet of oil transfer pump with the oil-out of oil transfer pump passes through the overflow pipe intercommunication, the overflow valve set up in on the overflow pipe, its characterized in that, fuel oil system still includes:

the first pressure sensor is arranged at an oil inlet of the oil transfer pump;

2. The fuel system as recited in claim 1, further comprising a fuel tank in communication with said fuel feed pump inlet, an end of said return line being in communication with said fuel tank.

3. The fuel system as recited in claim 2, further comprising a fuel strainer disposed between the fuel tank and the fuel inlet of the fuel transfer pump.

4. The fuel system as recited in claim 2, further comprising a fine fuel filter in communication with an outlet of said fuel transfer pump.

5. The fuel system as recited in claim 4, further comprising a one-way throttle valve in communication with the fine fuel filter and the fuel tank.

6. The fuel system as recited in claim 1, wherein the solenoid valve is a normally closed two-position two-way valve, the controller closes the normally closed two-position two-way valve, and an oil inlet of the oil transfer pump is communicated with an oil outlet of the oil transfer pump; the controller opens the normally closed two-position two-way valve, and the oil inlet of the oil transfer pump is disconnected with the oil outlet of the oil transfer pump.

7. The fuel system as recited in claim 1, wherein a calculating unit and a judging unit are arranged in the controller, the calculating unit is used for calculating a pressure difference value between the first pressure sensor and the second pressure sensor, and the judging unit is used for judging the magnitude of the pressure difference value and a preset pressure difference value.

8. The fuel system as recited in claim 1, wherein said controller is an ECU.