Oil pump device, vehicle, and control method

Abstract

The invention relates to the field of vehicles, in particular to an oil pump device, a vehicle and a control method.The oil pump device comprises a motor mechanism, a plunger and a pump body, and the plunger is in driving connection with the motor mechanism; the end, away from the motor mechanism, of the plunger extends into the pump body and is movably connected with the pump body, and the motor mechanism can drive the plunger to move in the pump body so as to control the pump body to pump oil. According to the oil pump device, the plunger is driven by the motor mechanism to move in the pump body so as to control the pump body to pump oil, the oil pumping amount in the oil pumping process of the pump body can be more accurately controlled, the oil return amount can be reduced, and even the oil return process can be directly reduced, so that energy is effectively saved, and the use cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and in particular to an oil pump device, a vehicle, and a control method. Background Art

[0002] The automotive industry is rapidly developing, and regulations regarding emissions, power, and fuel consumption are becoming increasingly stringent. Consumer demand for vehicle performance is also increasing. The current operating mode of a high-pressure fuel pump is as follows: the engine ECU monitors the fuel rail pressure in real time via a rail pressure sensor and, based on engine operating conditions, pumps fuel from the pump into the rail. The current mainstream method for driving the high-pressure fuel pump is a camshaft-plunger mechanism. However, the plunger mechanism's continuous reciprocating motion with the camshaft makes it difficult to precisely control the amount of fuel pumped. Summary of the Invention

[0003] An embodiment of the present application provides an oil pump device that can accurately control the amount of pumped oil.

[0004] In order to achieve the above-mentioned object, according to a first aspect of the present application, an oil pump device is provided, comprising:

[0005] Motor mechanism;

[0006] a plunger drivingly connected to the motor mechanism; and

[0007] The pump body has one end of the plunger away from the motor mechanism extending into the pump body and being movably connected to the pump body. The motor mechanism can drive the plunger to move in the pump body to control the pump body to pump oil.

[0008] Optionally, the motor mechanism includes a linear motor, which is drive-connected to the plunger.

[0009] Optionally, the linear motor includes:

[0010] stator assembly; and,

[0011] A mover assembly is fixedly connected to the plunger, and the mover assembly can be electromagnetically coupled with the stator assembly to drive the plunger to move in a straight line under the drive of the stator assembly.

[0012] Optionally, the motor mechanism further includes a motor cover, the motor cover is connected to the pump body, and a motor cavity is formed between the motor cover and the pump body, and the linear motor is arranged in the motor cavity.

[0013] Optionally, the stator assembly is connected to the motor cover, and the mover assembly is movable in the motor cavity.

[0014] Optionally, the stator assembly includes a coil and a first connecting member, the first connecting member is connected to the motor cover, and the coil is arranged on the first connecting member; the mover assembly includes a magnet and a second connecting member, the plunger extends into the motor cavity and is connected to the second connecting member, the magnet is mounted on the second connecting member, and the magnet can be electromagnetically coupled with the coil; or,

[0015] The stator assembly includes a magnet and a first connecting member, the first connecting member is connected to the motor cover, and the magnet is arranged on the first connecting member; the mover assembly includes a coil and a second connecting member, the plunger extends into the motor cavity and is connected to the second connecting member, the coil is installed on the second connecting member, and the magnet can be electromagnetically coupled with the coil.

[0016] Optionally, the stator assembly is connected to the pump body and extends into the motor cavity, and the mover assembly is movable relative to the pump body.

[0017] Optionally, a stator cavity is formed between the stator assembly and the pump body, and the mover assembly is movably arranged in the stator cavity.

[0018] Optionally, the stator assembly includes a magnet and a first connecting member, the first connecting member is fixedly connected to the pump body, and the stator cavity is formed between the first connecting member and the pump body, the magnet is arranged in the stator cavity and connected to the first connecting member; the mover assembly includes a coil and a second connecting member, the coil and the second connecting member are both arranged in the stator cavity, the plunger extends into the stator cavity and is connected to the second connecting member, the coil is mounted on the second connecting member, and the magnet can be electromagnetically coupled to the coil; or,

[0019] The stator assembly includes a coil and a first connecting member, the first connecting member is fixedly connected to the pump body, and the stator cavity is formed between the first connecting member and the pump body, the coil is arranged in the stator cavity and connected to the first connecting member; the mover assembly includes a magnet and a second connecting member, the magnet and the second connecting member are both arranged in the stator cavity, the plunger extends into the stator cavity and is connected to the second connecting member, the magnet is installed on the second connecting member, and the magnet can be electromagnetically coupled with the coil.

[0020] Optionally, the oil pump device further comprises a sealing member, which is provided on the pump body, and the end of the plunger away from the motor mechanism passes through the sealing member and extends into the pump body.

[0021] According to a second aspect of the present application, a vehicle is provided, comprising the oil pump device according to the first aspect.

[0022] Optionally, the vehicle further includes a fuel injector and a high-pressure fuel rail, the high-pressure fuel rail is connected to the fuel pump device, and the fuel injector is connected to the high-pressure fuel rail.

[0023] According to a third aspect of the present application, a control method is provided. The control method is applied to the oil pump device described in the first aspect, wherein the oil pump device is connected to a high-pressure oil rail. The control method includes:

[0024] controlling the plunger to be located at a first position in the pump body, and controlling the pump body to absorb oil;

[0025] Obtaining the fuel rail pressure of the high-pressure fuel rail;

[0026] When the oil rail pressure of the high-pressure oil rail is lower than a threshold value, the motor mechanism drives the plunger to move to the second position of the pump body, so that the pump body pumps oil into the high-pressure oil rail;

[0027] When the rail pressure of the high-pressure rail is not lower than a threshold value, the plunger is maintained at the first position of the pump body.

[0028] Optionally, the motor mechanism drives the plunger to move toward the second position of the pump body so that the pump body pumps oil into the high-pressure oil rail, comprising:

[0029] The motor mechanism drives the plunger to move toward a second position within the pump body, so that the pump body pumps oil;

[0030] When the plunger moves to the second position in the pump body and the oil rail pressure is still lower than the threshold value, the motor mechanism drives the plunger to move to the first position in the pump body and then moves to the second position in the pump body again. The pump body repeatedly absorbs and pumps oil until the oil rail pressure increases to no less than the threshold value.

[0031] Optionally, the motor mechanism drives the plunger to move to the second position of the pump body so that the pump body pumps oil into the high-pressure oil rail further includes:

[0032] When the plunger moves to the second position in the pump body or the oil rail pressure is not lower than a threshold during the movement, the motor mechanism drives the plunger to stop and move to the first position in the pump body.

[0033] Optionally, when the oil rail pressure of the high-pressure oil rail is not lower than a threshold value, after the plunger is maintained at the first position of the pump body, the control method further includes:

[0034] Obtaining the injection amount and / or rail pressure of the high-pressure oil rail, and calculating the number of oil pumping times of the pump body, and the stop position of the plunger when the pump body pumps oil for the last time;

[0035] The motor mechanism drives the plunger to move so that the pump body completes the corresponding number of oil pumpings, and during the last oil pumping, drives the plunger to move and stop at a stop position, and then drives the plunger to move to the first position in the pump body.

[0036] In the oil pump device of the embodiment of the present application, the plunger is driven by a motor mechanism to move in the pump body to control the pumping of oil by the pump body. The amount of oil pumped during the pumping process can be more accurately controlled, the amount of oil returned can be reduced, and the oil return process can even be directly eliminated, thereby effectively saving energy and reducing usage costs.

[0037] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0039] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0040] Figure 1 FIG. 1 is a schematic structural diagram of a first embodiment of an oil pump device provided in an exemplary embodiment of the present disclosure.

[0041] Figure 2 yes Figure 1 The diagram shows the structure of the pump body, plunger, seal and mover assembly of the oil pump device.

[0042] Figure 3 yes Figure 1 Schematic diagram of the structure of the motor cavity and stator assembly of the oil pump device shown.

[0043] Figure 4 FIG. 2 is a schematic structural diagram of a second embodiment of an oil pump device provided in an exemplary embodiment of the present disclosure.

[0044] Figure 5 yes Figure 4 The diagram shows the structure of the oil pump device hiding the motor cover.

[0045] Figure 6 is a flowchart of a control method provided in an exemplary embodiment of the present disclosure.

[0046] Description of reference numerals:

[0047] 1. Pump body;

[0048] 2. Plunger;

[0049] 3. Motor mechanism; 31. Coil; 32. First connecting member; 321. Connector; 322. Limiting member; 323. Stator cavity; 33. Magnet; 34. Second connecting member; 35. Motor cover; 351. Motor cavity;

[0050] 4. Seals. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0052] The first aspect of the present application provides an oil pump device. Figure 1 The oil pump device includes a pump body 1, a plunger 2 and a motor mechanism 3. The plunger 2 is driven and connected to the motor mechanism 3. The end of the plunger 2 away from the motor mechanism 3 extends into the pump body 1 and is movably connected to the pump body 1. The motor mechanism 3 can drive the plunger 2 to move in the pump body 1 to control the pump body 1 to pump oil.

[0053] By driving the plunger 2 to move in the pump body 1 through the motor mechanism 3, the pumping of oil by the pump body 1 can be controlled. This driving method of the motor mechanism 3 can more accurately control the amount of oil pumped by the pump body 1 during the oil pumping process, reduce the amount of oil return, and even directly subtract the oil return process, thereby effectively saving energy and reducing usage costs.

[0054] In some embodiments, the motor mechanism 3 includes a linear motor that is drivably connected to the plunger 2. This linear motor eliminates the need for an intermediate transmission mechanism and can directly drive the plunger 2 to move linearly within the pump body 1, thereby controlling the pumping of oil by the pump body 1. This can reduce both cost and the size of the oil pump assembly.

[0055] In some embodiments, the linear motor comprises:

[0056] stator assembly; and,

[0057] The mover assembly is fixedly connected to the plunger 2 and can be electromagnetically coupled with the stator assembly to drive the plunger 2 to move in a straight line under the drive of the stator assembly.

[0058] The stator assembly drives the mover assembly to perform linear motion through electromagnetic coupling with the mover assembly, thereby driving the plunger 2 to perform linear motion in the pump body 1. This driving method is more direct and efficient.

[0059] In some embodiments, the motor mechanism 3 further includes a motor cover 35 , which is connected to the pump body 1 , and a motor cavity 351 is formed between the motor cover 35 and the pump body 1 , and the linear motor is disposed in the motor cavity 351 .

[0060] When the oil pump device is being transported or installed on a vehicle for use, based on the linear motor being located in the motor cavity 351, the linear motor can be protected by the motor cover 35 to prevent the linear motor from being damaged by collision with external structures, thereby effectively improving the reliability of the oil pump device.

[0061] For example, when the oil pump device is installed on the engine, the motor cover 35 can be fixed on the engine, or the motor cover 35 is directly a part of the engine housing.

[0062] In some embodiments, the stator assembly is connected to the motor cover 35 , and the mover assembly is movable within the motor cavity 351 .

[0063] The stator assembly and the mover assembly are arranged separately. When the linear motor needs to be maintained or repaired, the stator assembly and the mover assembly can be quickly disassembled by removing the motor cover 35 from the pump body 1, so as to facilitate maintenance or repair of the stator assembly and the mover assembly.

[0064] In some embodiments, the stator assembly includes a coil 31 and a first connector 32, the first connector 32 is connected to the motor cover 35, and the coil 31 is disposed on the first connector 32; the mover assembly includes a magnet 33 and a second connector 34, the plunger 2 extends into the motor cavity 351 and is connected to the second connector 34, the magnet 33 is mounted on the second connector 34, and the magnet 33 is capable of electromagnetically coupling with the coil 31. In other implementations, the stator assembly may include a magnet 33 and a first connector 32, the first connector 32 is connected to the motor cover 35, and the magnet 33 is disposed on the first connector 32; the mover assembly includes a coil 31 and a second connector 34, the plunger 2 extends into the motor cavity 351 and is connected to the second connector 34, the coil 31 is mounted on the second connector 34, and the magnet 33 is capable of electromagnetically coupling with the coil 31.

[0065] Please combine Figure 3 , the coil 31 can be fixed on the motor cover 35 in advance through the first connecting member 32, please combine Figure 2 , and the magnet 33 is fixed to the plunger 2 in advance through the second connecting member 34. When the oil pump device needs to be assembled, the motor cover 35 can be directly docked and installed with the pump body 1, which can improve the installation efficiency of the oil pump device.

[0066] Optionally, the first connecting member 32 includes a connecting body 321 and a limiting body 322. The connecting body 321 is vertically fixed to the inner side of the stator cavity 323 of the motor cover 35, and the limiting body 322 is fixed to the end of the connecting body 321 away from the motor cover 35. The connecting body 321 and the limiting body 322 are combined to form a "T" shape. The coil 31 is wound on the connecting body 321, and the diameter of the coil 31 does not exceed the length of the limiting body 322.

[0067] In some embodiments, the second connecting member 34 may be fixed to the plunger 2 or may be directly integrally formed with the plunger 2 .

[0068] In some embodiments, this embodiment and Figure 1 The difference between the embodiments shown is the structure of the linear motor. Figure 4 In this embodiment, the stator assembly is connected to the pump body 1 and extends into the motor cavity 351 , and the mover assembly can move relative to the pump body 1 .

[0069] The stator assembly is mounted on the pump body 1, and the mover assembly is mounted on the plunger 2 connected to the pump body 1. That is to say, the stator assembly and the mover assembly are both maintained in position by the pump body 1, so that the performance of the mover assembly and the stator assembly will not be affected by the installation error between the pump body 1 and the motor cover 35; and when the oil pump device is in use, the relative position between the stator assembly and the mover assembly can also be more stable.

[0070] In some embodiments, a stator cavity 323 is formed between the stator assembly and the pump body 1 , and the mover assembly is movably disposed in the stator cavity 323 .

[0071] When installing the oil pump device, the mover assembly is installed on the plunger 2, and then the stator assembly is installed on the pump body 1, and the mover assembly is accommodated in the stator cavity 323, and finally the pump body 1 is connected to the motor cover 35; when the pump body 1 and the motor cover 35 are assembled, since the mover assembly and the plunger 2 are both located in the stator cavity 323 and are protected by the stator assembly, the mover assembly and the plunger 2 can be prevented from colliding with the motor cover 35.

[0072] In some embodiments, the stator assembly includes a magnet 33 and a first connecting member 32, the first connecting member 32 is fixedly connected to the pump body 1, and a stator cavity 323 is formed between the first connecting member 32 and the pump body 1, the magnet 33 is arranged in the stator cavity 323 and connected to the first connecting member 32; the mover assembly includes a coil 31 and a second connecting member 34, the coil 31 and the second connecting member 34 are both arranged in the stator cavity 323, the plunger 2 extends into the stator cavity 323 and is connected to the second connecting member 34, the coil 31 is installed on the second connecting member 34, and the magnet 33 can be electromagnetically coupled with the coil 31; In another embodiment, the stator assembly may include a coil 31 and a first connecting member 32, the first connecting member 32 is fixedly connected to the pump body 1, and a stator cavity 323 is formed between the first connecting member 32 and the pump body 1, and the coil 31 is arranged in the stator cavity 323 and connected to the first connecting member 32; the mover assembly may include a magnet 33 and a second connecting member 34, the magnet 33 and the second connecting member 34 are both arranged in the stator cavity 323, the plunger 2 extends into the stator cavity 323 and is connected to the second connecting member 34, the magnet 33 is installed on the second connecting member 34, and the magnet 33 can be electromagnetically coupled with the coil 31.

[0073] When installing the oil pump unit, please combine Figure 5 , after installing the coil 31 on the plunger 2 through the second connecting piece 34, the magnet 33 is installed on the first connecting piece 32, and finally the first connecting piece 32 is installed on the pump body 1 to complete the assembly of the linear motor; when the pump body 1 and the motor cover 35 are assembled, the mover assembly and the plunger 2 are both located in the stator cavity 323 of the first connecting piece 32 and are protected by the first connecting piece 32, which can prevent the mover assembly and the plunger 2 from colliding with the motor cover 35.

[0074] In some embodiments, the oil pump device further includes a seal 4 , which is disposed on the pump body 1 . The end of the plunger 2 away from the motor mechanism 3 passes through the seal 4 and extends into the pump body 1 , thereby preventing oil leakage from the pump body 1 .

[0075] Exemplarily, the seal 4 is an annular structure, which can be specifically a rubber sealing ring. The seal 4 is fixed to the pump body 1 for installation in the hole of the plunger 2. The plunger 2 passes through the seal 4 and extends into the pump body 1 to be movably connected with the pump body 1; when the plunger 2 moves relative to the pump body 1, the seal 4 can play a sealing role at the connection between the two to prevent oil leakage.

[0076] A second aspect of the present application provides a vehicle comprising the oil pump device of the first aspect.

[0077] In some embodiments, the vehicle further includes a fuel injector and a high-pressure fuel rail, the high-pressure fuel rail is connected to the fuel pump device, and the fuel injector is connected to the high-pressure fuel rail.

[0078] The third aspect of this application provides a control method, please combine Figure 6 The control method is applied to the oil pump device of the first aspect, the oil pump device is connected to the high-pressure oil rail, and the control method specifically includes the following steps:

[0079] S101 , controlling the plunger 2 to be located at the first position in the pump body 1 , and controlling the pump body 1 to absorb oil.

[0080] During the oil suction process of the pump body 1 , the low-pressure oil pump connected to the pump body 1 can pump the oil inside the pump body 1 into the pump body 1 .

[0081] For example, the first position is the bottom dead center, i.e., when the motor mechanism 3 drives the plunger 2 to its lowest point, the end of the plunger 2 is located within the pump body 1. At this time, the volume of the cavity of the pump body 1 is at its maximum. It is also worth noting that in this application, the structure of the pump body 1 itself and its connection to the high-pressure oil rail are conventional.

[0082] S102: Obtain the fuel rail pressure of the high-pressure fuel rail.

[0083] For vehicles, the rail pressure of the high-pressure fuel rail is related to the fuel injection effect, affecting engine performance, emissions and fuel economy; therefore, when the rail pressure of the high-pressure fuel rail is low, in order to improve the fuel injection effect, the rail pressure of the high-pressure fuel rail needs to be quickly increased.

[0084] S103 : When the oil rail pressure of the high-pressure oil rail is lower than the threshold, the motor mechanism 3 drives the plunger 2 to move to the second position of the pump body 1 , so that the pump body 1 pumps oil into the high-pressure oil rail.

[0085] By driving the plunger 2 to move in the pump body 1 through the motor mechanism 3, the pumping of oil by the pump body 1 can be controlled. This driving method of the motor mechanism 3 can more accurately control the amount of oil pumped by the pump body 1 during the oil pumping process, reduce the amount of oil return, and even directly subtract the oil return process, thereby effectively saving energy and reducing usage costs.

[0086] In some embodiments, the threshold rail pressure is 350 bar.

[0087] For example, the top dead center can be used as the second position, that is, when the motor mechanism 3 drives the plunger 2 to rise to the highest point, the end of the plunger 2 is in the position inside the pump body 1, and the volume of the space inside the pump body 1 is the smallest.

[0088] Among them, when the plunger 2 moves from the bottom dead center to the top dead center, the solenoid valve between the pump body 1 and the low-pressure oil pump is closed. Under the action of pressure, the one-way oil outlet valve between the pump body 1 and the high-pressure oil rail is opened, and the fuel in the pump body 1 flows into the high-pressure oil rail, so that the pump body 1 can pump oil into the high-pressure oil rail.

[0089] In some embodiments, the motor mechanism 3 drives the plunger 2 to move to the second position of the pump body 1 so that the pump body 1 pumps oil into the high-pressure oil rail, including:

[0090] The motor mechanism 3 drives the plunger 2 to move to the second position in the pump body 1, so that the pump body 1 pumps oil;

[0091] When the plunger 2 moves to the second position in the pump body 1 and the oil rail pressure is still lower than the threshold value, the motor mechanism 3 drives the plunger 2 to move to the first position in the pump body 1 and moves to the second position in the pump body 1 again. The pump body 1 repeats the oil suction and oil pumping until the oil rail pressure increases to no less than the threshold value.

[0092] The motor mechanism 3 drives the plunger 2 to repeatedly move between the first position and the second position in the pump body 1 to control the pump body 1 to repeatedly absorb and pump oil, so that the oil rail pressure can be quickly increased to near the threshold.

[0093] In some embodiments, the motor mechanism 3 drives the plunger 2 to move to the second position of the pump body 1 so that the pump body 1 pumps oil into the high-pressure oil rail further includes:

[0094] When the plunger 2 moves to the second position in the pump body 1 or the oil rail pressure is not lower than the threshold during the movement, the motor mechanism 3 drives the plunger 2 to stop and move to the first position in the pump body 1 .

[0095] When the motor mechanism 3 drives the plunger 2 to move, when the oil rail pressure increases to no less than a threshold value, the motor mechanism 3 can stop driving the pump oil in time and drive the plunger 2 to move to the first position in the pump body 1, so as to accurately control the pumping amount of the pump body 1 and effectively avoid excessive oil pumping.

[0096] For example, when the oil rail pressure is lower than the threshold and the pump body 1 repeatedly absorbs and pumps oil, the ECU can determine whether oil injection is required. If oil injection is required, the ECU calculates the injection amount and controls the injector to inject oil.

[0097] S104 : When the oil rail pressure of the high-pressure oil rail is not lower than the threshold, the plunger 2 is maintained at the first position of the pump body 1 .

[0098] For the high-pressure oil rail, this is the rail pressure stabilization stage. During this stage, the rail pressure of the high-pressure oil rail is stable near the threshold, and the plunger 2 does not need to move in the pump body 1 to pump oil.

[0099] In some embodiments, when the oil rail pressure of the high-pressure oil rail is not lower than the threshold, after the plunger 2 is maintained in the first position of the pump body 1, the control method further includes:

[0100] Obtain the injection volume and / or rail pressure of the high-pressure fuel rail, and calculate the number of times the pump body 1 pumps oil, as well as the stop position of the plunger 2 when the pump body 1 pumps oil for the last time;

[0101] The motor mechanism 3 drives the plunger 2 to move so that the pump body 1 completes the corresponding number of oil pumpings, and during the last oil pumping, drives the plunger 2 to move and stop at the stop position, and then drives the plunger 2 to move to the first position in the pump body 1.

[0102] When the high-pressure oil rail is spraying oil, the motor mechanism 3 can accurately control the oil pumping amount of the pump body 1 according to the oil injection amount, effectively avoiding excessive oil pumping.

[0103] Exemplarily, the injection of the high-pressure oil rail is completed by the injector connected thereto; specifically, the ECU determines whether oil injection is required. If oil injection is required, the ECU calculates the injection amount and controls the injector to inject oil; after the injection, the ECU comprehensively calculates the oil pumping displacement distance of the motor mechanism 3 driving the plunger 2 based on the injection amount and / or the rail pressure value.

[0104] The specific method is as follows:

[0105] Pump oil volume V 泵油量 and injection volume V 喷油量 The calculation formula is as follows:

[0106] V 泵油量 =V 喷油量 +α;

[0107] α is the correction value. After correction, the pumped oil brings the rail pressure closer to the target value. Data can be obtained through experiments, and then the value fitted based on the injection volume, temperature, rail pressure, etc. can be used as α. Alternatively, after experiments, the experimental values ​​can be organized into a table, and a table lookup method can be used to select the closest value based on the input value as α. It can be understood that this correction value is a fixed correction value obtained through experiments.

[0108] The calculation formula of the pump oil volume V pump oil volume and the pump oil displacement distance l driven by the motor mechanism 3 to drive the plunger 2 is as follows:

[0109] V 泵油量 =S 泵 ×l;

[0110] Among them, S 泵 is the bottom area of ​​the pump chamber (or the end of the plunger 2). It is worth noting that the oil pump displacement distance l refers to the displacement distance from the bottom dead center to the top dead center, and does not include the displacement distance from the top dead center back to the bottom dead center. When l is greater than the distance from the bottom dead center to the top dead center, the motor mechanism 3 needs to drive the plunger 2 to pump oil multiple times.

[0111] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0112] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0113] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0114] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. An oil pump device, characterized in that: include: Motor mechanism; a plunger, the plunger being drivingly connected to the motor mechanism; and, The pump body has one end of the plunger away from the motor mechanism extending into the pump body and being movably connected to the pump body. The motor mechanism can drive the plunger to move in the pump body to control the pump body to pump oil.

2. The oil pump device according to claim 1, characterized in that The motor mechanism includes a linear motor, and the linear motor is drivingly connected to the plunger.

3. The oil pump device according to claim 2, characterized in that The linear motor comprises: stator assembly; and, A mover assembly is fixedly connected to the plunger, and the mover assembly can be electromagnetically coupled with the stator assembly to drive the plunger to move in a straight line under the drive of the stator assembly.

4. The oil pump device according to claim 3, characterized in that The motor mechanism further includes a motor cover, which is connected to the pump body. A motor cavity is formed between the motor cover and the pump body, and the linear motor is disposed in the motor cavity.

5. The oil pump device according to claim 4, characterized in that The stator assembly is connected to the motor cover, and the mover assembly can move in the motor cavity.

6. The oil pump device according to claim 5, characterized in that The stator assembly includes a coil and a first connecting member, the first connecting member is connected to the motor cover, and the coil is arranged on the first connecting member; the mover assembly includes a magnet and a second connecting member, the plunger extends into the motor cavity and is connected to the second connecting member, the magnet is mounted on the second connecting member, and the magnet can be electromagnetically coupled with the coil; or, The stator assembly includes a magnet and a first connecting member, the first connecting member is connected to the motor cover, and the magnet is arranged on the first connecting member; the mover assembly includes a coil and a second connecting member, the plunger extends into the motor cavity and is connected to the second connecting member, the coil is installed on the second connecting member, and the magnet can be electromagnetically coupled with the coil.

7. The oil pump device according to claim 4, characterized in that The stator assembly is connected to the pump body and extends into the motor cavity, and the mover assembly can move relative to the pump body.

8. The oil pump device according to claim 7, characterized in that A stator cavity is formed between the stator assembly and the pump body, and the mover assembly is movably arranged in the stator cavity.

9. The oil pump device according to claim 8, characterized in that The stator assembly includes a magnet and a first connecting member, the first connecting member is fixedly connected to the pump body, and the stator cavity is formed between the first connecting member and the pump body, the magnet is arranged in the stator cavity and connected to the first connecting member; the mover assembly includes a coil and a second connecting member, the coil and the second connecting member are both arranged in the stator cavity, the plunger extends into the stator cavity and is connected to the second connecting member, the coil is mounted on the second connecting member, and the magnet can be electromagnetically coupled to the coil; or, The stator assembly includes a coil and a first connecting member, the first connecting member is fixedly connected to the pump body, and the stator cavity is formed between the first connecting member and the pump body, the coil is arranged in the stator cavity and connected to the first connecting member; the mover assembly includes a magnet and a second connecting member, the magnet and the second connecting member are both arranged in the stator cavity, the plunger extends into the stator cavity and is connected to the second connecting member, the magnet is installed on the second connecting member, and the magnet can be electromagnetically coupled with the coil.

10. The oil pump device according to any one of claims 1 to 9, characterized in that: The oil pump device further includes a sealing member, which is disposed on the pump body. An end of the plunger away from the motor mechanism passes through the sealing member and extends into the pump body.

11. A vehicle, characterized in that: The oil pump device comprises the oil pump device according to any one of claims 1 to 10.

12. The vehicle according to claim 11, characterized in that The vehicle further comprises a fuel injector and a high-pressure fuel rail, wherein the high-pressure fuel rail is connected to the fuel pump device, and the fuel injector is connected to the high-pressure fuel rail.

13. A control method, characterized in that: The control method is applied to the oil pump device according to any one of claims 1 to 10, wherein the oil pump device is connected to a high-pressure oil rail, and the control method comprises: controlling the plunger to be located at a first position in the pump body, and controlling the pump body to absorb oil; Obtaining the fuel rail pressure of the high-pressure fuel rail; When the oil rail pressure of the high-pressure oil rail is lower than a threshold value, the motor mechanism drives the plunger to move to the second position of the pump body, so that the pump body pumps oil into the high-pressure oil rail; When the rail pressure of the high-pressure rail is not lower than a threshold value, the plunger is maintained at the first position of the pump body.

14. The control method according to claim 13, characterized in that: The motor mechanism drives the plunger to move to the second position of the pump body so that the pump body pumps oil into the high-pressure oil rail, which includes: The motor mechanism drives the plunger to move toward a second position within the pump body, so that the pump body pumps oil; When the plunger moves to the second position in the pump body and the oil rail pressure is still lower than the threshold value, the motor mechanism drives the plunger to move to the first position in the pump body and then moves to the second position in the pump body again. The pump body repeatedly absorbs and pumps oil until the oil rail pressure increases to no less than the threshold value.

15. The control method according to claim 14, characterized in that: The motor mechanism drives the plunger to move to the second position of the pump body so that the pump body pumps oil into the high-pressure oil rail, and the like further comprises: When the plunger moves to the second position in the pump body or the oil rail pressure is not lower than a threshold during the movement, the motor mechanism drives the plunger to stop and move to the first position in the pump body.

16. The control method according to claim 13, characterized in that: When the oil rail pressure of the high-pressure oil rail is not lower than a threshold value, after the plunger is maintained at the first position of the pump body, the control method further includes: Obtaining the injection amount and / or rail pressure of the high-pressure oil rail, and calculating the number of oil pumping times of the pump body, and the stop position of the plunger when the pump body pumps oil for the last time; The motor mechanism drives the plunger to move so that the pump body completes the corresponding number of oil pumpings, and during the last oil pumping, drives the plunger to move and stop at a stop position, and then drives the plunger to move to the first position in the pump body.

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