A control system based on pressure relief variable pump

Abstract

The present invention provides a control system based on a pressure relief variable pump, comprising a pressure relief variable pump, a pilot valve, a solenoid valve, a pump outlet, a main oil channel, an oil pan, and an ECU, wherein the pressure relief variable pump is provided with a first feedback oil chamber and a second feedback oil chamber; the first feedback oil chamber and the second feedback oil chamber are respectively communicated with the pump outlet or the main oil channel through an oil circuit, wherein a pilot valve is provided on the oil circuit between the second feedback oil chamber and the pump outlet or the main oil channel, and the pilot valve comprises a control chamber and a transfer chamber; the solenoid valve is arranged on the oil circuit between the control chamber of the pilot valve and the main oil channel, and the feedback oil from the main oil channel controls the pilot valve through the solenoid valve, and as the valve core of the pilot valve moves, the second feedback oil chamber selectively communicates with the pump outlet / main oil channel or the oil pan through the transfer chamber of the pilot valve. The present invention realizes the full variable displacement control of the pressure relief variable pump through the combination of the proportional solenoid valve and the pilot valve, and the control accuracy is significantly improved.

Description

Technical Field

[0001] The invention relates to the technical field of internal combustion engine lubrication systems, and in particular to a control system based on a pressure relief variable pump. Background Art

[0002] The fully variable displacement oil pump control system can realize the on-demand oil supply of the engine lubrication system and improve the energy saving effect. In the prior art, the fully variable displacement oil pump control system generally adopts the boost type, that is, the oil pressure in the main oil channel drives the slider variable through the proportional solenoid valve. This variable method lacks a pressure compensation control device, and the control accuracy and response time are poor; while the pressure relief variable pump is mainly a two-stage variable displacement pump controlled by a switch solenoid valve, but it cannot achieve full displacement change. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a control system based on a pressure relief variable pump to achieve fully variable displacement.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: a control system based on a pressure relief variable pump, including a pressure relief variable pump, a pilot valve, a solenoid valve, a pump outlet, a main oil channel, an oil pan, and an ECU. The pressure relief variable pump includes a pump body, a variable slider, a variable spring, a first feedback oil chamber, and a second feedback oil chamber. The first feedback oil chamber is arranged on one side of the variable slider, and the second feedback oil chamber and the variable spring are arranged on the other side of the variable slider; the first feedback oil chamber and the second feedback oil chamber are respectively connected to the pump outlet or the main oil channel through oil circuits, wherein a pilot valve is provided on the oil circuit between the second feedback oil chamber and the pump outlet or the main oil channel. The pilot valve includes a control chamber and a transfer chamber; the solenoid valve is arranged on the oil circuit between the control chamber of the pilot valve and the main oil channel, and the feedback oil from the main oil channel controls the pilot valve through the solenoid valve. As the valve core of the pilot valve moves, the second feedback oil chamber is selectively connected to the pump outlet / main oil channel or the oil pan through the transfer chamber of the pilot valve; when the second feedback oil chamber is connected to the oil pan, the oil pressure in the first feedback oil chamber is greater than the sum of the oil pressure in the second feedback oil chamber and the preload force of the variable spring, and the oil pressure in the first feedback oil chamber will push the variable slider to compress the variable spring for radial movement, thereby reducing the eccentricity between the variable slider and the rotor, thereby reducing the output displacement.

[0005] Furthermore, a damping hole is provided on the oil passage between the pilot valve and the pump outlet or the main oil passage.

[0006] Preferably, the solenoid valve is a proportional solenoid valve, and the output pressure of the proportional solenoid valve is achieved by adjusting the duty cycle of the proportional solenoid valve by the ECU according to the sensor signals collected by the ECU.

[0007] Furthermore, a safety valve is installed on the oil circuit between the pump outlet and the oil pan.

[0008] The present invention realizes the fully variable displacement control of the pressure relief type variable pump through the combination of the proportional solenoid valve and the pilot valve, and the control accuracy is significantly improved, the response time is significantly shortened, and the energy saving effect of the engine lubrication system is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the control system structure in Example 1 of the present invention;

[0010] Figure 2 This is a schematic diagram of the control system structure in Example 2 of the present invention;

[0011] The accompanying drawings are marked as follows:

[0012] 1——pressure relief variable pump, 1a——first control chamber, 1b——second control chamber, 2——pilot valve, 3——solenoid valve, 4——pump outlet, 5——main oil channel, 6——ECU, 7——damping hole, 8——safety valve. DETAILED DESCRIPTION

[0013] 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.

[0014] 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.

[0015] Example 1

[0016] like Figure 1A control system based on a pressure relief variable pump is shown, comprising a pressure relief variable pump 1, a pilot valve 2, a proportional solenoid valve 3, a pump outlet 4, a main oil channel 5, an oil pan, and an ECU 6. The pressure relief variable pump comprises a pump body, a variable slider, a variable spring, a first feedback oil chamber 1a, and a second feedback oil chamber 1b. The first feedback oil chamber 1a is arranged on one side of the variable slider, and the second feedback oil chamber 1b and the variable spring are arranged on the other side of the variable slider; the first feedback oil chamber 1a and the second feedback oil chamber 1b are respectively connected to the pump outlet 4 through oil circuits, wherein a pilot valve 2 is provided on the oil circuit between the second feedback oil chamber 1b and the pump outlet 4, and the pilot valve 2 comprises a control chamber and a transfer chamber; a damping hole 7 is provided on the oil circuit between the transfer chamber of the pilot valve 2 and the pump outlet 4; the proportional solenoid valve 3 is arranged in the control chamber and In the oil circuit between the main oil channels 5, the ECU 6 adjusts the duty cycle of the proportional solenoid valve 3 according to the sensor signals collected by it. The feedback oil from the main oil channel 5 enters the control chamber of the pilot valve 2 through the proportional solenoid valve 3 and pushes the valve core of the pilot valve 2 to move. As the valve core of the pilot valve 2 moves, the second feedback oil chamber 1b is selectively connected to the pump outlet 4 or the oil pan through the transfer chamber of the pilot valve 2; when the second feedback oil chamber 1b is connected to the oil pan, the oil pressure in the first feedback oil chamber 1a is greater than the sum of the oil pressure in the second feedback oil chamber 1b and the preload of the variable spring, and the oil pressure in the first feedback oil chamber 1a will push the variable slider to compress the variable spring for radial movement, so that the eccentricity between the variable slider and the rotor is reduced, thereby reducing the output displacement; a safety valve 8 is installed in the oil circuit between the pump outlet 4 and the oil pan.

[0017] Example 2

[0018] like Figure 2 The control system based on the pressure relief variable pump shown in the figure is basically the same in structure and working principle as that of the embodiment 1, except that the first feedback oil chamber 1a and the second feedback oil chamber 1b in the embodiment are respectively connected to the main oil passage 5 through oil passages, wherein a pilot valve 2 is provided on the oil passage between the second feedback oil chamber 1b and the main oil passage 5, and a damping hole 7 is provided on the oil passage between the transfer chamber of the pilot valve 2 and the main oil passage 5. That is to say, the feedback oil of the first feedback oil chamber 1a and the second feedback oil chamber 1b in the embodiment comes from the main oil passage 5, while the feedback oil of the embodiment 1 comes from the pump outlet 4. In comparison, the oil of the main oil passage 5 has better cleanliness due to the machine cooling and oil filtering, and is not easy to block the feedback oil passage, thus avoiding variable sticking.

[0019] 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.

[0020] 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. A control system based on a pressure relief variable displacement pump, characterized in that: The invention comprises a pressure relief variable pump (1), a pilot valve (2), a solenoid valve (3), a pump outlet (4), a main oil channel (5), an oil pan, and an ECU (6). The pressure relief variable pump (1) comprises a pump body, a rotor, a variable slider, a variable spring, a first feedback oil chamber (1a), and a second feedback oil chamber (1b). The first feedback oil chamber (1a) is arranged on one side of the variable slider, and the second feedback oil chamber (1b) and the variable spring are arranged on the other side of the variable slider. The first feedback oil chamber (1a) and the second feedback oil chamber (1b) are respectively connected to the pump outlet (4) or the main oil channel (5) through oil channels. A pilot valve (2) is arranged on the oil channel between the second feedback oil chamber (1b) and the pump outlet (4) or the main oil channel (5). The pilot valve (2) comprises a control chamber and a The solenoid valve (3) is arranged on the oil path between the control chamber of the pilot valve (2) and the main oil channel (5). The feedback oil from the main oil channel (5) controls the pilot valve (2) through the solenoid valve (3). As the valve core of the pilot valve (2) moves, the second feedback oil chamber (1b) is selectively connected to the pump outlet (4) / main oil channel (5) or the oil pan through the transfer chamber of the pilot valve (2). When the second feedback oil chamber (1b) is connected to the oil pan, the oil pressure in the first feedback oil chamber (1a) is greater than the sum of the oil pressure in the second feedback oil chamber (1b) and the preload force of the variable spring. The oil pressure in the first feedback oil chamber (1a) pushes the variable slider to compress the variable spring to move radially, thereby reducing the eccentricity between the variable slider and the rotor, thereby reducing the output displacement.

2. The control system based on the pressure relief variable pump according to claim 1 is characterized in that: A damping hole (7) is provided on the oil passage between the pilot valve (2) and the pump outlet (4) or the main oil passage (5).

3. The control system based on the pressure relief variable pump according to claim 1 is characterized in that: The solenoid valve (3) is a proportional solenoid valve, and the output pressure of the proportional solenoid valve is achieved by the ECU (6) adjusting the duty cycle of the proportional solenoid valve according to the sensor signals collected by the ECU (6).

4. The control system based on the pressure relief variable pump according to claim 1 is characterized in that: A safety valve (8) is installed in the oil circuit between the pump outlet (4) and the oil pan.

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