Oiling pump control circuit and vehicle

Abstract

The utility model belongs to the technical field of vehicles, and provides a petrol pump control circuit and a vehicle, the petrol pump control circuit comprises a power supply, a first relay, a second relay, a third relay, a petrol pump and a controller; the contact of the first relay is a normally closed contact, and the contacts of the second relay and the third relay are normally open contacts; the second end of the coil of the first relay is connected with the cathode of the power supply; the first end of the coil of the second relay is connected with the controller, and the second end is connected to the cathode of the power supply through the contact of the first relay; the first end of the coil of the third relay is connected to the positive pole of the power supply through the contact of the second relay, and the second end is connected to the negative pole of the power supply; a contact of the third relay and the refueling pump are connected in series between positive and negative electrodes of the power supply. The refueling convenience of the refueling vehicle can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicles, and more specifically, relates to a refueling pump control circuit and a vehicle. Background Art

[0002] For construction machinery vehicles, due to their inconvenient mobility, in actual use, they cannot be refueled as conveniently as ordinary cars.

[0003] Construction machinery vehicles generally use mobile refueling trucks to refuel, and some models are equipped with electric refueling pumps so that they can be refueled from the refueling truck at any time. However, when the refueling pump on the refueling truck or construction machinery vehicle is not equipped with a refueling gun, personnel are required to observe the refueling progress in real time during the refueling process so that they can stop refueling at any time to prevent the fuel tank from overflowing when it is full. It is very likely that fuel overflow will occur due to negligence of personnel, which will not only cause waste of resources, but also may cause serious safety accidents such as fires, and will also pollute the soil and groundwater, causing long-term negative impacts on the environment. In addition, due to the large capacity of the excavator's fuel tank, each refueling takes a long time, and when the weather is cold or other bad weather, the personnel are extremely hard. Utility Model Content

[0004] The utility model aims to provide a refueling pump control circuit and a vehicle, so as to improve the convenience of refueling of the refueling vehicle.

[0005] In a first aspect, an embodiment of the utility model provides a refueling pump control circuit, comprising: a power supply, a first relay, a second relay, a third relay, a refueling pump and a controller; the contact of the first relay is a normally closed contact, and the contacts of the second relay and the third relay are normally open contacts;

[0006] The first end of the coil of the first relay is connected to the controller, and the second end is connected to the negative pole of the power supply; the first end of the coil of the second relay is connected to the controller, and the second end is connected to the negative pole of the power supply through the contacts of the first relay; the first end of the coil of the third relay is connected to the positive pole of the power supply through the contacts of the second relay, and the second end is connected to the negative pole of the power supply; the contacts of the third relay are connected in series with the gas pump between the positive and negative poles of the power supply.

[0007] In combination with the first aspect, in a possible implementation of the first aspect, a combination switch is further provided on the series branch between the contacts of the third relay and the refueling pump, and the combination switch is used to control the current direction of the refueling pump to make the refueling pump rotate forward or reverse.

[0008] In combination with the first aspect, in a possible implementation of the first aspect, the combination switch includes a first single-pole double-throw switch and a second single-pole double-throw switch;

[0009] The movable end of the first single-pole double-throw switch is connected to the first end of the gas pump; the first fixed end of the first single-pole double-throw switch is connected to the contact of the third relay; the second fixed end of the first single-pole double-throw switch is respectively connected to the negative electrode of the power supply and the contact of the third relay;

[0010] The moving end of the second single-pole double-throw switch is connected to the second end of the gas pump; the first fixed end of the second single-pole double-throw switch is respectively connected to the negative pole of the power supply and the contact of the third relay; the second fixed end of the second single-pole double-throw switch is connected to the contact of the third relay.

[0011] In combination with the first aspect, in a possible implementation manner of the first aspect, the combination switch has a first state and a second state;

[0012] When the movable end of the first single-pole double-throw switch contacts the first fixed end and the movable end of the second single-pole double-throw switch contacts the first fixed end, the combination switch is in the first state;

[0013] When the movable end of the first single-pole double-throw switch contacts the second fixed end and the movable end of the second single-pole double-throw switch contacts the second fixed end, the combination switch is in the second state.

[0014] In combination with the first aspect, in a possible implementation of the first aspect, the second fixed end of the first single-pole double-throw switch and the first fixed end of the second single-pole double-throw switch are both connected to the contact of the third relay through a first diode.

[0015] In combination with the first aspect, in a possible implementation manner of the first aspect, the first end of the coil of the third relay is further connected to the positive electrode of the power supply through a manual switch.

[0016] In combination with the first aspect, in a possible implementation manner of the first aspect, a capacitor with a preset capacitance is connected in parallel between the positive and negative electrodes of the power supply.

[0017] In combination with the first aspect, in a possible implementation of the first aspect, the first end of the contact of the second relay is connected to the positive electrode of the power supply, the second end of the contact of the second relay is connected to the first end of the coil of the third relay through a second diode; the second end of the coil of the third relay is connected to the negative electrode of the power supply through a third diode.

[0018] In combination with the first aspect, in a possible implementation of the first aspect, a resistor with a preset resistance is connected in parallel between the first end and the second end of the coil of the second relay, and the second end of the contact of the second relay is also connected to the first end of the coil of the second relay through a fourth diode.

[0019] In a second aspect, an embodiment of the utility model provides a vehicle, comprising a refueling pump automatic control circuit as described in the first aspect or any possible implementation of the first aspect, and further comprising: an oil level sensor and a display control screen; the oil level sensor and the display control screen are both connected to the controller.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] In an embodiment of the utility model, the controller can be used to control the coil of the second relay to be energized during refueling, the normally open contact of the second relay is closed, the coil of the third relay is energized, the normally open contact of the third relay is closed, and the refueling pump is powered on. After refueling is completed, the controller controls the coil of the first relay to be energized, the normally closed contact of the first relay is disconnected, the coil of the second relay is de-energized, the normally open contact of the second relay is disconnected, and then the coil of the third relay is de-energized, the normally open contact of the third relay is disconnected, and the refueling pump loses power and stops running. Through this circuit, personnel can control the refueling pump through the vehicle controller in the cab. Alternatively, the vehicle controller can also automatically control the refueling pump according to the written control program, thereby improving the convenience of refueling the refueling truck. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of the fuel pump control circuit provided by the embodiment of the utility model Figure 1 ;

[0023] Figure 2 A schematic diagram of the structure of the fuel pump control circuit provided by the embodiment of the utility model Figure 2 . DETAILED DESCRIPTION

[0024] The present application is described more clearly below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the effects of the present application, but are not intended to limit the present application in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present application. These all fall within the scope of protection of the present application.

[0025] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0026] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0027] In the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and should not be understood as indicating or implying relative importance.

[0028] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0029] In addition, the “plurality” mentioned in the embodiments of the present application should be interpreted as two or more.

[0030] In order to illustrate the technical solution of the present invention, specific embodiments are provided below for illustration.

[0031] Engineering vehicles play a vital role in many industries such as construction, mining, road construction, water conservancy, and landscaping. They not only greatly improve work efficiency but also reduce labor costs. However, due to the characteristics of engineering vehicles, in actual use, they cannot be refueled as conveniently as ordinary cars. For example, excavators cannot be refueled as conveniently as ordinary vehicles due to the following characteristics:

[0032] Harsh working conditions: Excavators usually work in complex environments such as construction sites and mines, which may be far away from gas stations and have rugged terrain, making fuel transportation and replenishment difficult.

[0033] Difficult to drive: Unlike ordinary cars, excavators are mainly off-road vehicles. They are designed mainly for digging, loading and other operations on uneven ground, rather than driving long distances. Therefore, they often do not have the ability to travel long distances to gas stations on their own, nor can they easily drive on the road to find a refueling point.

[0034] High fuel consumption: Due to the need to drive a large body and perform high-intensity excavation operations, the fuel consumption of excavators is relatively high. This means that even if you can find a way to refuel, you need to refuel regularly and in large quantities, which increases the difficulty and cost of refueling.

[0035] Due to the above reasons, currently, mobile refueling trucks are generally used to refuel excavators. For larger-scale mining areas, specific refueling areas will be configured, and some models will be equipped with electric refueling pumps so that fuel can be refueled from refueling trucks at any time. When the refueling truck and the refueling pump on the excavator are not equipped with a refueling gun, the refueling process requires personnel to observe the refueling progress in real time so that they can stop refueling at any time to prevent the fuel tank from overflowing when it is full, which is very inconvenient.

[0036] In view of the above problems, the embodiment of the present application proposes a refueling pump automatic control circuit, which can control the fuel filling through a controller (which can be a vehicle controller, etc.), and personnel can observe the refueling process in real time in the cab and perform operations to improve the convenience of refueling. Here, the refueling pump is used to pump fuel from a refueling truck to an engineering machinery vehicle, and it can be located on a refueling truck or an engineering machinery vehicle. The refueling pump automatic control circuit follows the refueling pump and can be integrated into a refueling truck or an engineering machinery vehicle.

[0037] Figure 1 : is a schematic diagram of the structure of a fuel pump control circuit provided by an embodiment of the utility model, and the fuel pump control circuit comprises:

[0038] Power supply, first relay RE1, second relay RE2, third relay RE3, refueling pump M and controller. Among them, the contact k1 of the first relay RE1 is a normally closed contact, and the contact k2 of the second relay RE2 and the contact k3 of the third relay RE3 are normally open contacts.

[0039] The first end of the coil J1 of the first relay RE1 is connected to the controller, and the second end is connected to the negative pole of the power supply; the first end of the coil J2 of the second relay RE2 is connected to the controller, and the second end is connected to the negative pole of the power supply through the contact k1 of the first relay RE1; the first end of the coil J3 of the third relay RE3 is connected to the positive pole of the power supply through the contact k2 of the second relay RE2, and the second end is connected to the negative pole of the power supply; the contact k3 of the third relay RE3 is connected in series with the gas pump M between the positive and negative poles of the power supply.

[0040] according to Figure 1 In the structure shown in the embodiment of the utility model, the refueling process is as follows:

[0041] When the external refueling pipeline is arranged, the fuel filling personnel can operate it in the cab. The operation button can be a physical button or a virtual button on the display control screen. For example, when the preparation work is completed, the fuel filling personnel presses the virtual button "Add Fuel" on the display control screen in the cab. After the display control screen receives the signal, it sends the corresponding message to the vehicle controller through the vehicle CAN communication. The vehicle controller receives the fuel addition signal request, and the DO1_H pin sends a high-level signal to control the coil J2 of the second relay RE2 to be energized, and the normally open contact k2 of the second relay RE2 is closed, so that the coil J3 of the third relay RE3 is energized, and the normally open contact k3 of the third relay RE3 is closed, and the refueling pump M is energized to start refueling.

[0042] Typically, vehicles (engineering vehicles and refueling trucks) are equipped with oil level sensors, and the oil level sensor signals are fed back to the vehicle controller in real time.

[0043] In one case, the fueling personnel can see the change of fuel volume on the display control screen. When the fuel level of the construction machinery vehicle increases to a certain value, or the storage oil volume of the refueling truck decreases to a certain value, the fueling personnel can manually press the virtual button "Stop refueling" on the display control screen. After receiving the signal, the display control screen sends the corresponding message to the vehicle controller through the vehicle CAN communication. The vehicle controller receives the stop refueling signal request, and the DO2_H pin sends a high-level signal to control the coil J1 of the first relay RE1 to attract, and the normally closed contact k1 of the first relay RE1 is disconnected, so that the coil J2 of the second relay RE2 is de-energized, and the normally open contact k2 of the second relay RE2 is disconnected, and then the coil J3 of the third relay RE3 is de-energized, and the normally open contact k3 of the third relay RE3 is disconnected, and the refueling pump M loses power and stops running, and the refueling is completed.

[0044] In another case, an automatic refueling program can be embedded in the vehicle controller. When the vehicle controller determines that the fuel level of the construction machinery vehicle increases to a certain value, or the amount of oil stored in the refueling truck decreases to a certain value, the DO2_H pin automatically sends a high-level signal to control the refueling pump M to stop.

[0045] It can be seen that in the embodiment, the controller can be used to control the coil of the second relay to be energized during refueling, the normally open contact of the second relay is closed, the coil of the third relay is energized, the normally open contact of the third relay is closed, and the refueling pump is powered on. After refueling is completed, the controller controls the coil of the first relay to be energized, the normally closed contact of the first relay is disconnected, the coil of the second relay is de-energized, the normally open contact of the second relay is disconnected, and then the coil of the third relay is de-energized, the normally open contact of the third relay is disconnected, and the refueling pump loses power and stops running. Through this circuit, personnel can control the refueling pump through the vehicle controller in the cab, which effectively solves the situation where the refueling progress needs to be observed outside in real time when there is no refueling gun to refuel, especially in bad weather, after the refueling personnel have set up the refueling pipeline outside, they can wait for the end of refueling in the cab. Alternatively, the vehicle controller can also automatically control the refueling pump according to the written control program to improve the convenience of refueling.

[0046] The above embodiment is a simple schematic diagram of the fuel pump control circuit. Figure 1 On the basis of the embodiment, the functions are expanded. Alternatively, in order to make the circuit run more reasonably, auxiliary devices such as diodes and resistors need to be added at appropriate positions.

[0047] Figure 2 is Figure 1 Based on the embodiment, a more detailed structural schematic diagram of a fuel pump control circuit is provided, and the added content is introduced below:

[0048] Optionally, the first end of the coil J3 of the third relay RE3 is also connected to the positive pole of the power supply through the manual switch S1.

[0049] In this embodiment, a manual switch S1 is configured in the fuel pump control circuit. When the fuel pipeline is arranged, the manual switch S1 is pressed, the coil J3 of the third relay RE3 is directly energized, the normally open contact k3 of the third relay RE3 is closed, the fuel pump is powered on, and fuel filling begins. In this mode, the person who needs to refuel observes the progress of refueling in real time. When the fuel tank is nearly full, the manual switch S1 is pressed again, the coil J3 of the third relay RE3 is de-energized, the normally open contact k3 is disconnected, and the fuel pump stops running. That is, the conventional manual fuel filling function can be realized through the manual switch S1.

[0050] Optionally, a combination switch S2 is further provided in the series branch between the contact k3 of the third relay RE3 and the refueling pump M. The combination switch S2 is used to control the current direction of the refueling pump M so that the refueling pump M rotates forward or reversely.

[0051] When the refueling truck and excavator have their own refueling pump but are not equipped with a refueling gun, the oil remaining in the refueling pipe after refueling with the electric refueling pump cannot be discharged in time, and will slowly flow out to the frame and the bottom plate. After a long period of accumulation, waste oil will accumulate, greatly increasing the possibility of causing serious safety accidents such as fires. At the same time, oil leakage to the ground will also pollute the soil and groundwater, causing long-term negative impacts on the environment. In this embodiment, the combination switch S2 controls the refueling pump M to reverse after refueling, so that the oil remaining in the refueling pipe can be emptied after refueling.

[0052] Here, the combination switch S2 includes a first single-pole double-throw switch and a second single-pole double-throw switch; the moving end a5 of the first single-pole double-throw switch is connected to the first end of the gas pump M; the first fixed end a1 of the first single-pole double-throw switch is connected to the contact k3 of the third relay RE3; the second fixed end a2 of the first single-pole double-throw switch is respectively connected to the negative pole of the power supply and the contact k3 of the third relay RE3; the moving end a6 of the second single-pole double-throw switch is connected to the second end of the gas pump M; the first fixed end a3 of the second single-pole double-throw switch is respectively connected to the negative pole of the power supply and the contact k3 of the third relay RE3; the second fixed end a4 of the second single-pole double-throw switch is connected to the contact k3 of the third relay RE3.

[0053] In this embodiment, the combination switch S2 has a first state and a second state.

[0054] When the moving end a5 of the first single-pole double-throw switch contacts the first fixed end a1, and the moving end a6 of the second single-pole double-throw switch contacts the first fixed end a3, the combination switch S2 is in the first state. The current direction is: positive pole of power supply → a1 → a5 → refueling pump M → a6 → a3 → negative pole of power supply, and the refueling pump M rotates forward at this time.

[0055] When the moving end a5 of the first single-pole double-throw switch contacts the second fixed end a2, and the moving end a6 of the second single-pole double-throw switch contacts the second fixed end a4, the combination switch S2 is in the second state. The current direction is: positive pole of power supply → a4 → a6 → refueling pump M → a5 → a2 → negative pole of power supply, and the refueling pump M reverses at this time.

[0056] When refueling, the combination switch S2 is in the first state. After refueling, press the combination switch S2 first, the combination switch S2 switches to the second state, the polarity of the power supply of the refueling pump M is reversed, and the residual oil in the refueling pipe is discharged. Finally, press S1 and S2, and the refueling pump stops running.

[0057] Optionally, in order to make the circuit run more reasonably and ensure the flow direction of the current, diodes D1, D2, D3, D4, a resistor R and a capacitor C are further added in this embodiment.

[0058] The second fixed terminal a2 of the first single-pole double-throw switch and the first fixed terminal a3 of the second single-pole double-throw switch are both connected to the contact k3 of the third relay RE3 through the first diode D1.

[0059] Capacitor C is connected in parallel between the positive and negative electrodes of the power supply, and its capacitance is set according to requirements.

[0060] A first end of the contact k2 of the second relay RE2 is connected to the positive electrode of the power supply, a second end of the contact k2 of the second relay RE2 is connected to a first end of the coil J3 of the third relay RE3 via a second diode D2; a second end of the coil J3 is connected to the negative electrode of the power supply via a third diode D3.

[0061] A resistor R with a preset resistance is connected in parallel between the first and second ends of the coil J2 of the second relay RE2. The second end of the contact k2 of the second relay RE2 is also connected to the first end of the coil J2 of the second relay RE2 via a fourth diode D4.

[0062] Through the setting of these auxiliary components, the correct operation of the circuit can be guaranteed.

[0063] The utility model also provides a vehicle, which includes the above-mentioned automatic control circuit for a fuel pump, and further includes: an oil level sensor and a display control screen; the oil level sensor and the display control screen are both connected to a controller.

[0064] The present invention effectively solves the problem of needing to observe the refueling progress in real time when there is no refueling gun, especially in bad weather. After the refueling personnel have set up the refueling pipeline externally, they can operate and wait for the completion of refueling in the cab, thereby improving the convenience of refueling the tanker truck.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A refueling pump control circuit, characterized in that: include: A power supply, a first relay, a second relay, a third relay, a refueling pump and a controller; the contact of the first relay is a normally closed contact, and the contacts of the second relay and the third relay are normally open contacts; The first end of the coil of the first relay is connected to the controller, and the second end is connected to the negative pole of the power supply; the first end of the coil of the second relay is connected to the controller, and the second end is connected to the negative pole of the power supply through the contacts of the first relay; the first end of the coil of the third relay is connected to the positive pole of the power supply through the contacts of the second relay, and the second end is connected to the negative pole of the power supply; the contacts of the third relay are connected in series with the gas pump between the positive and negative poles of the power supply.

2. The refueling pump control circuit according to claim 1, characterized in that: A combination switch is also provided on the series branch between the contact of the third relay and the refueling pump, and the combination switch is used to control the current direction of the refueling pump to make the refueling pump rotate forward or reverse.

3. The fuel pump control circuit according to claim 2, characterized in that: The combination switch comprises a first single-pole double-throw switch and a second single-pole double-throw switch; The movable end of the first single-pole double-throw switch is connected to the first end of the gas pump; the first fixed end of the first single-pole double-throw switch is connected to the contact of the third relay; the second fixed end of the first single-pole double-throw switch is respectively connected to the negative electrode of the power supply and the contact of the third relay; The moving end of the second single-pole double-throw switch is connected to the second end of the gas pump; the first fixed end of the second single-pole double-throw switch is respectively connected to the negative pole of the power supply and the contact of the third relay; the second fixed end of the second single-pole double-throw switch is connected to the contact of the third relay.

4. The refueling pump control circuit according to claim 3, characterized in that: The combination switch has a first state and a second state; When the movable end of the first single-pole double-throw switch contacts the first fixed end and the movable end of the second single-pole double-throw switch contacts the first fixed end, the combination switch is in the first state; When the movable end of the first single-pole double-throw switch contacts the second fixed end and the movable end of the second single-pole double-throw switch contacts the second fixed end, the combination switch is in the second state.

5. The fuel pump control circuit according to claim 3, characterized in that: The second fixed end of the first single-pole double-throw switch and the first fixed end of the second single-pole double-throw switch are both connected to the contact of the third relay through a first diode.

6. The fuel pump control circuit according to claim 1, characterized in that: The first end of the coil of the third relay is also connected to the positive pole of the power supply through a manual switch.

7. The fuel pump control circuit according to claim 1, characterized in that: A capacitor with a preset capacitance value is also connected in parallel between the positive and negative electrodes of the power supply.

8. The fuel pump control circuit according to claim 1, characterized in that: The first end of the contact of the second relay is connected to the positive pole of the power supply, the second end of the contact of the second relay is connected to the first end of the coil of the third relay through the second diode; the second end of the coil of the third relay is connected to the negative pole of the power supply through the third diode.

9. The fuel pump control circuit according to claim 8, characterized in that: A resistor with a preset resistance is connected in parallel between the first end and the second end of the coil of the second relay, and the second end of the contact of the second relay is connected to the first end of the coil of the second relay through a fourth diode.

10. A vehicle, characterized in that: The fuel pump control circuit comprises any one of items 1 to 9 above, and further comprises: a fuel level sensor and a display control screen; The oil level sensor and the display control screen are both connected to the controller.

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