CN108843423B - A control system for a direct-push dual-chamber supercharged variable displacement oil pump - Google Patents

Abstract

The invention provides a control system of a direct-push type double-cavity supercharging variable-displacement oil pump, which comprises a variable-displacement vane pump and an on-off electromagnetic valve, wherein the variable-displacement vane pump comprises a pump body, a feedback oil cavity, a rotor, a variable sliding block and a variable spring, the feedback oil cavity and the variable spring are respectively positioned at two sides of the variable sliding block, and under the action of oil pressure in the feedback oil cavity and the elasticity of the variable spring, the variable sliding block can radially move in a rotor cavity; the feedback oil cavity comprises a first feedback cavity and a second feedback cavity, the first feedback cavity and the second feedback cavity are respectively connected to the main oil duct through an oil way, an on-off electromagnetic valve is arranged on the oil way between the first feedback cavity and the main oil duct, and the on-off electromagnetic valve can enable the oil way between the first feedback cavity and the main oil duct to be in a communicating state or a disconnecting state under the control of the ECU, and the second feedback cavity and the oil way directly arranged on the main oil duct are always in a communicating state.

Description

A control system for a direct-push dual-chamber supercharged variable displacement oil pump

Technical Field

The invention relates to the technical field of internal combustion engine lubrication systems, and in particular to a control system of a dual-chamber feedback variable displacement vane pump.

Background Art

The function of the oil pump is to supply lubricating oil to various sliding parts of the engine to ensure its normal operation. Its power source comes from the engine itself, and the oil flow at its outlet end is proportional to the engine speed. Since the engine speed is a variable, the required lubricating oil flow and the engine speed are not proportional. Therefore, when the engine works in a high-speed section, there will be a problem of excessive oil flow, which will cause a waste of engine power.

In the prior art, there are two main ways to control the flow of the oil pump. One is to set a pressure relief valve at the outlet of the pump. In this way, when the engine is operating in a low-speed section, as the speed gradually increases, the outlet oil pressure of the oil pump gradually increases; when the engine enters a high-speed section, the outlet oil pressure of the oil pump is higher than the pre-set pressure value of the pressure relief valve, and the pressure relief valve starts to work and discharges part of the oil, thereby maintaining the oil pressure at a constant value.

The other is to use a variable flow oil pump, which is equipped with a mechanical flow control mechanism, which is usually driven by the oil pressure feedback at one end of the oil pump outlet, for example, a vane-type variable flow oil pump. Compared with the first solution, this type of variable flow oil pump is conducive to improving the lubrication performance of the engine high-speed section, but due to the small number of adjustment sections, the delayed response of the oil pump flow change during operation, and the large range of oil pressure fluctuations, it cannot completely solve the lubrication problem of the engine at high speed or the problem of engine power waste.

With the increasing development and popularization of variable displacement technology of engine lubrication system oil pump, vane oil pump has been widely used. The existing vane pump includes two variable forms: single-acting chamber feedback and double-acting chamber feedback. The single-acting chamber feedback can be designed into a one-stage variable displacement mode, and MAP control can be achieved through an electro-hydraulic proportional control valve. The double-acting chamber feedback can be designed into a two-stage variable displacement mode.

Summary of the invention

The technical problem to be solved by the present invention is to provide a control system for a direct-push dual-chamber supercharged variable-displacement oil pump, which control system can realize a dual-chamber two-stage variable displacement mode.

In order to solve the above technical problems, the present invention adopts the following technical solutions: a control system of a direct-push dual-chamber supercharged variable-displacement oil pump, comprising a variable-displacement vane pump and a switch solenoid valve, wherein the variable-displacement vane pump comprises a pump body, a feedback oil chamber, a rotor, a variable slider and a variable spring, wherein the feedback oil chamber and the variable spring are respectively located on both sides of the variable slider, and under the action of the oil pressure in the feedback oil chamber and the elastic force of the variable spring, the variable slider can produce radial movement in the rotor chamber; the feedback oil chamber comprises a first feedback chamber and a second feedback chamber, wherein the first feedback chamber and the second feedback chamber are each connected to the main oil channel through an oil circuit, wherein a switch solenoid valve is provided on the oil circuit between the first feedback chamber and the main oil channel, and under the control of the ECU, the switch solenoid valve can make the oil circuit between the first feedback chamber and the main oil channel in a connected or disconnected state, and the oil circuit between the second feedback chamber and the main oil channel is always in a connected state.

In one embodiment, the switch solenoid valve is provided with a P port, an A port and a T port, wherein the P port is communicated with the main oil passage, the A port is communicated with the first feedback chamber, and the T port is communicated with the oil pan;

In the first-stage variable displacement stage, under the control of the ECU, the P port of the switch solenoid valve is connected to the A port, and the main oil channel pressure oil enters the first feedback chamber through the switch solenoid valve. At this stage, the first feedback chamber and the second feedback chamber are both filled with the main oil channel pressure oil; before the oil pressure in the main oil channel reaches the set low-pressure variable pressure point, the pressure oil in the first feedback chamber and the second feedback chamber is unable to push the variable slider to compress the variable spring for radial movement, and the eccentricity between the variable slider and the rotor is the largest at this time; when the oil pressure in the main oil channel reaches the set low-pressure variable pressure point, the oil pressure in the first feedback chamber and the second feedback chamber increases, thereby pushing the variable slider to compress the variable spring for radial movement, reducing the eccentricity between the variable slider and the rotor, thereby reducing the output displacement;

When the switch solenoid valve is switched to another working state under the control of the ECU, the P port of the switch solenoid valve is not connected to the A port, and the A port is connected to the T port, and the system enters the secondary variable displacement stage. In this stage, the second feedback chamber is filled with the main oil channel pressure oil, and there is no oil pressure supply in the first feedback chamber; before the oil pressure in the main oil channel reaches the set high-pressure variable pressure point, the pressure oil in the second feedback chamber is unable to push the variable slider to compress the variable spring for radial movement, and the eccentricity between the variable slider and the rotor is the largest at this time; when the oil pressure in the main oil channel reaches the set high-pressure variable pressure point, the oil pressure in the second feedback chamber increases, thereby pushing the variable slider to compress the variable spring for radial movement, reducing the eccentricity between the variable slider and the rotor, thereby reducing the output displacement.

The present invention uses a combination of dual feedback chambers and a switch solenoid valve to enable a dual-chamber feedback vane pump to achieve two-stage variable displacement, with simple control and timely response. At the same time, the present invention improves the structure of the variable slider, and the feedback oil chamber and the variable spring are respectively arranged on both sides of the variable slider, and the eccentricity of the variable slider and the rotor is adjusted by the radial movement of the variable slider in the rotor chamber, thereby eliminating the spring pressure block on the traditional variable slider, making the internal structure of the oil pump more compact.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of a control system of the present invention;

The accompanying drawings are marked as follows:

10——Variable displacement vane pump 11——Pump body 12——Variable displacement spring

13——Rotor 14——Variable slider 15——First feedback chamber

16——Second feedback chamber 20——Switch solenoid valve.

DETAILED DESCRIPTION

In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In the description of the present invention, it should be noted that, unless otherwise specified and defined, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two elements, it can be a direct connection, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meaning of the terms can be understood according to the specific circumstances.

As shown in FIG1 , a preferred embodiment of the present invention is: a control system of a direct-push dual-chamber supercharged variable displacement oil pump, comprising a variable displacement vane pump 10 and a switch solenoid valve 20, wherein the variable displacement vane pump 10 comprises a pump body 11, a variable spring 12, a rotor 13, a variable slider 14 and a feedback oil chamber, wherein the feedback oil chamber and the variable spring 12 are respectively located on both sides of the variable slider 14, and under the action of the oil pressure in the feedback oil chamber and the elastic force of the variable spring, the variable slider 14 can generate radial movement in the rotor chamber; the feedback oil chamber comprises a first feedback chamber 15 and a second feedback chamber 16. Feedback chamber 16, the first feedback chamber 15 and the second feedback chamber 16 are each connected to the main oil gallery through an oil circuit, wherein a switch solenoid valve 20 is provided on the oil circuit between the first feedback chamber 15 and the main oil gallery, the switch solenoid valve 20 is provided with a P port, an A port and a T port, wherein the P port is communicated with the main oil gallery, the A port is communicated with the first feedback chamber 15, and the T port is communicated with the oil pan; under the control of the ECU, the switch solenoid valve 20 can make the oil circuit between the first feedback chamber 15 and the main oil gallery in a connected or disconnected state, and the oil circuit between the second feedback chamber 16 and the main oil gallery is always in a connected state.

At different stages, the relevant components in the above technical solution are in different states.

In the first stage of variable displacement, under the control of the ECU, the P port of the switch solenoid valve 20 is connected to the A port, and the main oil channel pressure oil enters the first feedback chamber (25) through the switch solenoid valve 20. At this stage, the first feedback chamber 15 and the second feedback chamber 16 are both filled with the main oil channel pressure oil. Before the oil pressure of the main oil channel reaches the set low-pressure variable pressure point, the pressure oil in the first feedback chamber 15 and the second feedback chamber 16 is unable to push the variable slider 14 to compress the variable spring 12 for radial movement. At this time, the eccentricity between the variable slider 14 and the rotor (13) is the largest. When the oil pressure of the main oil channel reaches the set low-pressure variable pressure point, the oil pressure in the first feedback chamber 15 and the second feedback chamber 16 increases, thereby pushing the variable slider 14 to compress the variable spring 12 for radial movement, reducing the eccentricity between the variable slider 14 and the rotor 13, thereby reducing the output displacement.

When the switch solenoid valve 20 is switched to another working state under the control of the ECU, the P port of the switch solenoid valve 20 is not connected to the A port, and the A port is connected to the T port, and the system enters the secondary variable displacement stage. In this stage, the second feedback chamber 16 is filled with the main oil channel pressure oil, and there is no oil pressure supply in the first feedback chamber 15; before the oil pressure in the main oil channel reaches the set high-pressure variable pressure point, the pressure oil in the second feedback chamber 16 is unable to push the variable slider 14 to compress the variable spring 12 for radial movement, and the eccentricity between the variable slider 14 and the rotor 13 is the largest at this time; when the oil pressure in the main oil channel reaches the set high-pressure variable pressure point, the oil pressure in the second feedback chamber 16 increases, thereby pushing the variable slider 14 to compress the variable spring 12 for radial movement, reducing the eccentricity between the variable slider 14 and the rotor 13, thereby reducing the output displacement.

This embodiment uses a combination of dual feedback chambers and a switch solenoid valve to enable a dual-chamber feedback vane pump to achieve two-stage variable displacement, with simple control and timely response. At the same time, the present invention improves the structure of the variable slider, and the feedback oil chamber and the variable spring are respectively arranged on both sides of the variable slider. The variable slider generates radial movement in the rotor chamber to adjust the eccentricity between the variable slider and the rotor, thereby eliminating the spring pressure block on the traditional variable slider, making the internal structure of the oil pump more compact.

The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

In order to make it easier for ordinary technicians in the field to understand the improvements of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and for the sake of clarity, some other elements are omitted in this application document. Ordinary technicians in the field should realize that these omitted elements may also constitute the content of the present invention.

Claims (1)

1. A control system for a direct-push dual-chamber supercharged variable displacement oil pump, characterized in that it comprises a variable displacement vane pump (10) and a switch solenoid valve (20), wherein the variable displacement vane pump (10) comprises a pump body (11), a variable spring (12), a rotor (13), a variable slider (14) and a feedback oil chamber, wherein the feedback oil chamber and the variable spring (12) are respectively located on both sides of the variable slider (14), and under the action of the oil pressure in the feedback oil chamber and the elastic force of the variable spring, the variable slider (14) can generate radial movement in the rotor chamber; the feedback oil chamber comprises a first feedback chamber (15) and a second feedback chamber (16), wherein the first feedback chamber (15) and the second feedback chamber (16) are each connected to a main oil passage through an oil passage, wherein the first feedback chamber (15) and the main oil passage are connected to each other through an oil passage. A switch solenoid valve (20) is provided on the oil passage between the first feedback chamber (15) and the main oil passage. Under the control of the ECU, the switch solenoid valve can make the oil passage between the first feedback chamber (15) and the main oil passage in a connected or disconnected state, and the oil passage between the second feedback chamber (16) and the main oil passage always in a connected state; the switch solenoid valve (20) is provided with a P port, an A port and a T port, wherein the P port is connected to the main oil passage, the A port is connected to the first feedback chamber (15), and the T port is connected to the oil pan; in the first stage of variable displacement, under the control of the ECU, the P port of the switch solenoid valve (20) is connected to the A port, and the pressure oil of the main oil passage enters the first feedback chamber (15) through the switch solenoid valve (20). In this stage, the first feedback chamber (15) and the second feedback chamber (16) are both filled with the pressure oil of the main oil passage; in the stage of the oil pressure in the main oil passage Before reaching the set low-pressure variable pressure point, the pressure oil in the first feedback chamber (15) and the second feedback chamber (16) is unable to push the variable slider (14) to compress the variable spring (12) to move radially, and at this time the eccentricity between the variable slider (14) and the rotor (13) is the largest; when the oil pressure in the main oil channel reaches the set low-pressure variable pressure point, the oil pressure in the first feedback chamber (15) and the second feedback chamber (16) increases, thereby pushing the variable slider (14) to compress the variable spring (12) to move radially, so that the eccentricity between the variable slider (14) and the rotor (13) is reduced, thereby reducing the output displacement; when the switch solenoid valve (20) is switched to another working state under the control of the ECU, the P port of the switch solenoid valve (20) is not connected to the A port, and the A port is disconnected. The port is connected to the T port, and the system enters the secondary variable displacement stage. In this stage, the second feedback chamber (16) is filled with the main oil channel pressure oil, and the first feedback chamber (15) has no oil pressure supply; before the oil pressure of the main oil channel reaches the set high-pressure variable pressure point, the pressure oil in the second feedback chamber (16) is unable to push the variable slider (14) to compress the variable spring (12) for radial movement, and the eccentricity between the variable slider (14) and the rotor (13) is the largest at this time; when the oil pressure of the main oil channel reaches the set high-pressure variable pressure point, the oil pressure in the second feedback chamber (16) increases, thereby pushing the variable slider (14) to compress the variable spring (12) for radial movement, reducing the eccentricity between the variable slider (14) and the rotor (13), thereby reducing the output displacement.