Engine lubrication system

Abstract

The invention discloses an engine lubricating system which comprises an oil pan, an electronic oil pump and a main oil duct, the main oil duct is communicated with an oil chamber of the oil pan through the electronic oil pump, and the electronic oil pump is controlled to guide lubricating oil in the oil pan to the main oil duct; the hydraulic system further comprises a piston cooling nozzle oil duct, the piston cooling nozzle oil duct is communicated with the main oil duct through a valve body, and the valve body is controlled to be opened and closed so that the piston cooling nozzle oil duct can be communicated with or disconnected from the main oil duct. A plurality of piston cooling nozzles are arranged on the piston cooling nozzle oil duct, and the plurality of piston cooling nozzles are controlled to be opened and closed uniformly through a valve body; the problem of energy waste of a current lubricating system can be solved, meanwhile, the size of an oil pump is reduced under the same oil pumping condition, and the difficulty of vehicle structural layout is lowered.

Description

Technical Field

[0001] The invention relates to the field of engine lubrication, and in particular to an engine lubrication system. Background Art

[0002] The existing engine lubrication system generally uses a crankshaft-driven oil pump to pump oil. The oil pump speed is proportional to the engine crankshaft speed. The low oil pressure at low speed makes it difficult to meet the engine's lubrication pressure requirements. In order to meet the set pressure requirements, the oil pump's displacement needs to be increased. The oil pump is large in size, difficult to arrange, and has high oil consumption.

[0003] Therefore, in order to solve the above problems, an engine lubrication system is needed that can solve the problem of energy waste in the current lubrication system, while reducing the volume of the oil pump under the same pumping conditions and reducing the difficulty of vehicle structural layout. Summary of the invention

[0004] In view of this, the purpose of the present invention is to overcome the defects in the prior art and provide an engine lubrication system that can solve the problem of energy waste in the current lubrication system, while reducing the volume of the oil pump under the same pumping conditions and reducing the difficulty of vehicle structural layout.

[0005] The engine lubrication system of the present invention comprises an oil pan, an electronic oil pump and a main oil gallery, wherein the electronic oil pump connects the main oil gallery with the oil chamber of the oil pan, and the electronic oil pump is controlled to guide the lubricating oil in the oil pan to the main oil gallery; the main body is consistent with the existing solution and will not be described in detail here;

[0006] It also includes a piston cooling nozzle oil passage, which is connected to the main oil passage through a valve body, and the valve body is controlled to open or close so that the piston cooling nozzle oil passage is connected or disconnected with the main oil passage; a plurality of piston cooling nozzles are arranged on the piston cooling nozzle oil passage, and the plurality of piston cooling nozzles are controlled to open or close uniformly through the valve body. The valve body is arranged so that the plurality of piston cooling nozzles are controlled to open or close simultaneously, and the piston cooling nozzle of this scheme is always open, and the lubricating oil flows into the piston cooling nozzle oil passage through the opening and closing of the valve body. The plurality of piston cooling nozzles are arranged to cool the designated position, and the uniformity and consistency are guaranteed, and there will be no oil hysteresis of different nozzles, which will affect the engine performance, and the waste of oil can be improved, wherein the valve body is controlled by the control system to open a preset angle to meet the oil supply requirements of different working conditions, wherein the control system can select any one of the existing technologies to achieve the existing purpose, and will not be repeated here.

[0007] Furthermore, it also includes a pressure sensor, which is arranged on the main oil channel and is used to monitor the oil supply pressure of the main oil channel. The pressure sensor is electrically connected to the control system to provide pressure parameters, so that the control time and opening of the valve body can be more accurately controlled, and the oil output of the piston cooling nozzle can be more accurately controlled.

[0008] Furthermore, it also includes a supercharger, which connects the main oil channel and the oil chamber of the oil pan, and the lubricating oil in the main oil channel is guided to flow back to the oil pan through the supercharger.

[0009] Furthermore, it also includes an oil cooler and an oil filter, the oil inlet end of the electronic oil pump is connected to the oil chamber of the oil pan, the oil inlet end of the oil cooler is connected to the oil outlet end of the electronic oil pump, the oil inlet end of the oil filter is connected to the oil outlet end of the oil cooler, and the oil outlet end of the oil filter is connected to the main oil channel.

[0010] Furthermore, the main oil passage is also connected to a preset oil passage, and the main oil passage, the piston cooling nozzle oil passage and the preset oil passage are connected via a three-way valve, and the three-way valve is controlled to connect the main oil passage with the piston cooling nozzle oil passage and / or the preset oil passage. The meaning of the and / or is that two oil passages can be connected at the same time, or one of the oil passages can be connected independently, which will not be described in detail here. The setting of the three valves can control the cooling of the piston as needed.

[0011] Furthermore, the preset oil passages include a lubricating oil passage on the intake side of the cylinder head and a lubricating oil passage on the exhaust side of the cylinder head.

[0012] Furthermore, the exhaust-side camshaft in the engine is lubricated by the lubricating oil drawn from the lubricating oil passage on the exhaust side of the cylinder head. The lubricating oil drawn from the lubricating oil passage on the exhaust side of the cylinder head also lubricates the hydraulic tappets and VVT. The intake-side camshaft in the engine is lubricated by the lubricating oil drawn from the lubricating oil passage on the intake side of the cylinder head. The lubricating oil drawn from the lubricating oil passage on the intake side of the cylinder head also lubricates the hydraulic tappets, the high-pressure fuel pump and the VVT.

[0013] The beneficial effects of the present invention are as follows: the engine lubrication system disclosed by the present invention realizes the oil pressure decoupling control of the engine lubrication system through the pressure sensor and the modified piston cooling nozzle oil channel, compares the pressure monitored by the pressure sensor of the main oil channel with the required pressure of the current working condition, and makes adjustments in real time to ensure that the oil pump shaft power is consumed to the minimum extent under the premise of the pressure requirements of each oil circuit of the engine, reduces energy waste, and improves mileage; the invention selects and designs the oil pump according to the maximum required flow rate of the engine, and when the engine is at low speed, the electronic oil pump can run at a high speed to ensure the oil pressure of the engine at low speed, reduce the minimum displacement of the oil pump, thereby reducing the overall size of the oil pump, and the layout is simple and the space utilization rate is high. The invention is provided with an electronically controlled PCJ valve for uniformly controlling the injection time of the piston cooling nozzle PCJ. Generally speaking, when the engine power per liter is below 30kw, the piston heat load is relatively low and does not need to be cooled. The electronic proportional three-way valve in this working condition switches between 1-2 and 1-2 / 1-3 modes according to the engine power per liter, and controls the cooling of the piston as needed. The PCJ proportional three-way valve of the electronically controlled piston cooling nozzle is set on the main oil channel and is controlled in two ways: 1-2 / 1-3 and 1-2. It is closed when the engine power is less than 30kw, and opened when the power is greater than 30kw. Moreover, as the power increases, the flow cross-sectional area of ​​the 1-2 flow channel is increased, so that a larger flow of oil can be used to cool the piston cooling nozzle (i.e., cooling on demand). BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0015] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0016] Figure 1 The schematic diagram of the structure of the present invention is shown in the figure. The engine lubrication system in this embodiment includes an oil pan, an electronic oil pump and a main oil gallery. The electronic oil pump connects the main oil gallery with the oil chamber of the oil pan. The electronic oil pump is controlled to guide the lubricating oil in the oil pan to the main oil gallery. The main body is consistent with the existing solution and will not be described in detail here.

[0017] It also includes a piston cooling nozzle oil passage, which is connected to the main oil passage through a valve body, and the valve body is controlled to open or close so that the piston cooling nozzle oil passage is connected or disconnected with the main oil passage; a plurality of piston cooling nozzles are arranged on the piston cooling nozzle oil passage, and the plurality of piston cooling nozzles are controlled to open or close uniformly through the valve body. The valve body is arranged so that the plurality of piston cooling nozzles are controlled to open or close simultaneously, and the piston cooling nozzle of this scheme is always open, and the lubricating oil flows into the piston cooling nozzle oil passage through the opening and closing of the valve body. The plurality of piston cooling nozzles are arranged to cool the designated position, and the uniformity and consistency are guaranteed, and there will be no oil hysteresis of different nozzles, which will affect the engine performance, and the waste of oil can be improved, wherein the valve body is controlled by the control system to open a preset angle to meet the oil supply requirements of different working conditions, wherein the control system can select any one of the existing technologies to achieve the existing purpose, and will not be repeated here.

[0018] In this embodiment, a pressure sensor is also included, and the pressure sensor is arranged on the main oil channel, and the pressure sensor is used to monitor the oil supply pressure of the main oil channel. The pressure sensor is electrically connected to the control system to provide pressure parameters, so that the control time and opening of the valve body can be controlled more accurately, and the oil output of the piston cooling nozzle can be controlled more accurately.

[0019] In this embodiment, a supercharger is further included, and the supercharger connects the main oil channel and the oil chamber of the oil pan. The lubricating oil in the main oil channel is guided to flow back to the oil pan through the supercharger.

[0020] In this embodiment, an oil cooler and an oil filter are also included. The oil inlet end of the electronic oil pump is connected to the oil chamber of the oil pan, the oil inlet end of the oil cooler is connected to the oil outlet end of the electronic oil pump, the oil inlet end of the oil filter is connected to the oil outlet end of the oil cooler, and the oil outlet end of the oil filter is connected to the main oil channel.

[0021] In this embodiment, the main oil passage is also connected to a preset oil passage, and the main oil passage, the piston cooling nozzle oil passage and the preset oil passage are connected via a three-way valve, and the three-way valve is controlled to connect the main oil passage with the piston cooling nozzle oil passage and / or the preset oil passage. The meaning of and / or is that two oil passages can be connected at the same time, or one of the oil passages can be connected independently, which will not be described in detail here. The setting of the three valves can control the cooling of the piston as needed.

[0022] In this embodiment, the preset oil passages include a lubricating oil passage on the intake side of the cylinder head and a lubricating oil passage on the exhaust side of the cylinder head.

[0023] In this embodiment, the exhaust side camshaft in the engine is lubricated by the lubricating oil drawn from the lubricating oil passage on the exhaust side of the cylinder head. The lubricating oil drawn from the lubricating oil passage on the exhaust side of the cylinder head also lubricates the hydraulic tappets and VVT. The intake side camshaft in the engine is lubricated by the lubricating oil drawn from the lubricating oil passage on the intake side of the cylinder head. The lubricating oil drawn from the lubricating oil passage on the intake side of the cylinder head also lubricates the hydraulic tappets, the high-pressure fuel pump and the VVT.

[0024] This invention realizes the oil pressure decoupling control of the engine lubrication system. The pressure monitored by the pressure sensor of the main oil channel is compared with the required pressure of the current working condition, and real-time adjustment is made to ensure the minimum consumption of oil pump shaft power under the premise of ensuring the pressure requirements of each oil circuit of the engine, reduce energy waste, and increase mileage. This invention selects and designs the oil pump according to the maximum required flow rate of the engine. When the engine is at low speed, the electronic oil pump can run at a high speed to ensure the oil pressure of the engine at low speed, reduce the minimum displacement of the oil pump, and thus reduce the overall size of the oil pump. The layout is simple and the space utilization rate is high. This invention sets an electronically controlled PCJ valve to uniformly control the injection time of the piston cooling nozzle PCJ. Generally speaking, when the engine power per liter is below 30kw, the piston heat load is relatively low and does not need to be cooled. The electronic proportional three-way valve in this working condition switches between 1-2 and 1-2 / 1-3 modes according to the engine power per liter, and controls the cooling of the piston as needed. The PCJ proportional three-way valve of the electronically controlled piston cooling nozzle is set on the main oil channel and is controlled in two ways: 1-2 / 1-3 and 1-2. It is closed when the engine power is less than 30kw, and opened when the power is greater than 30kw. Moreover, as the power increases, the flow cross-sectional area of ​​the 1-2 flow channel is increased, so that a larger flow of oil can be used to cool the piston cooling nozzle (i.e., cooling on demand).

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An engine lubrication system, characterized in that: It includes an oil pan, an electronic oil pump and a main oil gallery, wherein the electronic oil pump connects the main oil gallery with the oil chamber of the oil pan, and the electronic oil pump is controlled to guide the lubricating oil in the oil pan to the main oil gallery; It also includes a piston cooling nozzle oil passage, the piston cooling nozzle oil passage is connected to the main oil passage through a valve body, and the valve body is controlled to open and close so that the piston cooling nozzle oil passage is connected or disconnected with the main oil passage; A plurality of piston cooling nozzles are arranged on the piston cooling nozzle oil passage, and the plurality of piston cooling nozzles are controlled to open and close uniformly by a valve body.

2. The engine lubrication system according to claim 1, characterized in that: It also includes a pressure sensor, which is arranged on the main oil channel and is used to monitor the oil supply pressure of the main oil channel.

3. The engine lubrication system according to claim 1, characterized in that: It also includes a supercharger, which connects the main oil channel and the oil chamber of the oil pan, and the lubricating oil in the main oil channel is guided to flow back to the oil pan through the supercharger.

4. The engine lubrication system according to claim 1, characterized in that: It also includes an oil cooler and an oil filter, the oil inlet end of the electronic oil pump is connected to the oil chamber of the oil pan, the oil inlet end of the oil cooler is connected to the oil outlet end of the electronic oil pump, the oil inlet end of the oil filter is connected to the oil outlet end of the oil cooler, and the oil outlet end of the oil filter is connected to the main oil channel.

5. The engine lubrication system according to claim 1, characterized in that: The main oil passage is also connected to a preset oil passage. The main oil passage, the piston cooling nozzle oil passage and the preset oil passage are connected via a three-way valve. The three-way valve is controlled to connect the main oil passage with the piston cooling nozzle oil passage and / or the preset oil passage.

6. The engine lubrication system according to claim 5, characterized in that: The preset oil passages include a lubricating oil passage on the intake side of the cylinder head and a lubricating oil passage on the exhaust side of the cylinder head.

7. The engine lubrication system according to claim 6, characterized in that: The exhaust-side camshaft in the engine is lubricated by the lubricating oil led out of the lubricating oil passage on the exhaust side of the cylinder head, and the intake-side camshaft in the engine is lubricated by the lubricating oil led out of the lubricating oil passage on the intake side of the cylinder head.

8. The engine lubrication system according to claim 1, characterized in that: The piston cooling nozzles are normally open.

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