Engine pre-oiling system and method

Abstract

The present application relates to a kind of engine pre-oiling system and method, including main oil tank and auxiliary oil tank, main oil tank is sequentially connected with main oil passage by pipeline by oil pump;Auxiliary oil tank is connected with the outlet of oil pump by corresponding pipeline with main oil passage respectively, and the pipeline connected with the outlet of oil pump is equipped with first pre-oiling pump, and the pipeline connected with main oil passage is equipped with second pre-oiling pump, and heating device is equipped on auxiliary oil tank.By increasing auxiliary oil tank and the pipeline and oil pump matched, the oil passage pressure fluctuation when engine is started first or normally is used to inject lubricating oil into auxiliary oil tank, so that when the viscosity of engine oil is increased in low temperature environment, the lubricating oil in auxiliary oil tank can be heated by heating device and sent into main oil passage, to avoid the problem of dry grinding, lubrication and damage caused by the influence of oil viscosity in bearing region.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engine technology, in particular to an engine pre-oil supply system and method. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] An engine needs a lubricating system to deliver oil to the required positions to ensure normal operation. The common lubricating system currently used is shown in the figure, which pre-supplies oil to a set pressure or after a set time, the engine is started. Figure 1

[0004] In cold regions, the viscosity of the oil increases due to the low temperature, affecting the running effect of the oil supply pump when the engine starts, making it difficult for the main oil passage, especially the bearing bush area far from the main oil passage inlet, to be covered with oil. At this time, if the oil pressure reaches the set value or the oil supply pump runs for a set period of time, the engine will perform a start action, and at this time the bearing bush is still in a state of lack of lubrication, causing the bearing bush to dry wear and damage. SUMMARY

[0005] In order to solve the technical problems existing in the background art, the present application provides an engine pre-oil supply system and method, which adds a sub-oil tank and a matching pipeline, valve and sensor in the existing lubricating system, forming four oil supply branches that play different roles to solve the problem of poor lubrication caused by increased oil viscosity.

[0006] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0007] The first aspect of the present application provides an engine pre-oil supply system, comprising:

[0008] A main oil tank is connected to an oil pump and a main oil passage through a pipeline.

[0009] A sub-oil tank is connected to the main oil passage and the outlet of the oil pump through a corresponding pipeline, and a first pre-oil supply pump is provided on the pipeline connected to the outlet of the oil pump, a second pre-oil supply pump is provided on the pipeline connected to the main oil passage, and a heating device is provided on the sub-oil tank.

[0010] The inlet of the oil pump is connected to the main oil tank, and the outlet of the oil pump is connected to a thermostat, a first oil filter and the main oil tank through a pipeline, and the first oil filter has a bypass valve arranged side by side.

[0011] ​The inlet of the first pre-oil pump is connected with the main oil tank, and the outlet is connected with the first interface of the first electromagnetic valve, the second interface of the first electromagnetic valve is connected with the second oil filter and the auxiliary oil tank through a pipeline, and the third interface of the first electromagnetic valve is connected with the outlet of the oil pump.

[0012] The first interface of the first electromagnetic valve is in communication with the second interface, or the first interface is in communication with the third interface.

[0013] The inlet of the second pre-oil pump is connected with the auxiliary oil tank, and the outlet is connected with the main oil passage through a pipeline, and a one-way valve is arranged on the pipeline.

[0014] The auxiliary oil tank is connected with the main oil passage through a pipeline, and a second electromagnetic valve is arranged on the pipeline.

[0015] A pressure sensor and a pressure limiting valve are arranged on the main oil passage, a liquid level sensor is arranged on the auxiliary oil tank, and the opening sequence of the second electromagnetic valve and the pressure limiting valve is determined according to the pressure of the main oil passage and the liquid level of the auxiliary oil tank.

[0016] The second aspect of the present application provides a system for realizing the engine pre-oil method, comprising the following steps:

[0017] According to the result of whether the engine is started for the first time, the first interface of the first electromagnetic valve is in communication with the third interface;

[0018] When the temperature of the main oil tank is not greater than a set value T1, the heating device of the auxiliary oil tank is started, and after being heated to a temperature greater than T1, the second pre-oil pump is started to pump the heated lubricating oil in the auxiliary oil tank into the main oil passage, and when the temperature of the end of the oil passage is greater than 90% x T1, the engine is started;

[0019] When the temperature of the main oil tank is greater than a set value T1, the first pre-oil pump is started to pump the lubricating oil in the main oil tank into the main oil passage, and when the pressure of the main oil passage is greater than a set value a, the engine is started; if the pressure of the main oil passage is not greater than the set value a, whether the engine starting condition is met is determined according to the working time of the first pre-oil pump.

[0020] When the engine is started, the oil pump works, and the first pre-oil pump stops.

[0021] During the operation of the engine, when the pressure of the main oil passage is greater than a set value b, if the liquid level in the auxiliary oil tank does not exceed a set position, the second electromagnetic valve is opened to drain the lubricating oil in the main oil passage into the auxiliary oil tank, and the second electromagnetic valve is closed; if the liquid level in the auxiliary oil tank exceeds the set position, the second electromagnetic valve is maintained in a closed state, and the lubricating oil is drained into the main oil tank or a set area.

[0022] Whether the engine is started for the first time is determined, specifically:

[0023] If yes, the first interface of the first electromagnetic valve is communicated with the second interface, the first pre-oil supply pump pumps the lubricating oil in the main oil tank into the auxiliary oil tank, and after reaching the set liquid level, the first pre-oil supply pump stops, and the first electromagnetic valve is actuated to communicate the first interface with the third interface.

[0024] If no, the first pre-oil supply pump stops, and the first interface of the first electromagnetic valve is communicated with the third interface.

[0025] Compared with the prior art, the above one or more technical solutions have the following beneficial effects:

[0026] 1. By increasing the auxiliary oil tank and the matched pipeline and the oil pump, the lubricating oil is injected into the auxiliary oil tank by using the pressure fluctuation of the oil passage when the engine is started for the first time or normally operated, so that when the viscosity of the engine oil is increased in a low-temperature environment, the lubricating oil in the auxiliary oil tank can be heated by using the heating device and then sent into the main oil passage, thereby avoiding the problems of dry grinding, lubrication and damage caused by the influence of the viscosity of the oil on the bearing bush region.

[0027] 2. The auxiliary oil tank can absorb the lubricating oil discharged from the main oil passage pressure relief when the engine is working, thereby reducing the opening times of the main oil passage pressure limiting valve and reducing the influence on the main oil passage pressure.

[0028] 3. The first pre-oil supply pump serves as a component for supplementing the lubricating oil to the auxiliary oil tank when the engine is started for the first time, and also serves as a power component for pre-supplying the lubricating oil when the engine is started at normal temperature, and after the engine is normally operated, the first pre-oil supply pump forms a standby component of the oil pump, thereby playing multiple roles.

[0029] 4. The original engine lubricating oil passage is not changed, but is decomposed into multiple branches that play different roles by increasing components, so that the engine can quickly locate the fault point during maintenance, which is beneficial to improve the work efficiency during maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0030] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the exemplary embodiments of the application given below, serve to explain the application, and do not constitute an improper limitation on the application.

[0031] Figure 1 is a schematic diagram of the lubricating system in the prior art;

[0032] Figure 2 is a schematic diagram of the engine pre-oil supply system provided by one or more embodiments of the application;

[0033] Figure 3 is a schematic diagram of the opening characteristic curve of the main oil passage pressure limiting valve provided by one or more embodiments of the application;

[0034] Figure 4is a flow chart of the engine pre-oil supply system according to one or more embodiments of the present application. DETAILED DESCRIPTION

[0035] The present application will be further described with reference to the drawings and embodiments.

[0036] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0037] It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting, as the scope of the application will be limited only by the appended claims. As used herein, except as otherwise expressly provided herein, by its use, the word "or" is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless specified otherwise, or as is clear by context, the word "or" is used in the inclusive sense of "and / or" even though the word "or" is often used in the exclusive sense. Also, unless otherwise indicated, terms such as "before," "after," "first," "second," and the like, are used herein to describe a chronological or relative sequence. However, such terms can be used simply to more particularly describe embodiments and can not be intended to or required to convey a strict chronological sequence in all cases or in every embodiment. Also, the use of "a" or "an" to describe embodiments is intended to be a description of "one or more" unless otherwise modified.

[0038] As described in the background section, due to the low temperature in cold regions, the viscosity of the engine oil is high, which affects the performance of the oil supply pump and thus the engine oil cannot be supplied to all the lubrication points. At this time, if the engine oil pressure reaches the set value or the oil supply pump operates for a set period of time, the engine performs a start-up action, and the bearing shell can still be in a state of lacking lubrication, thereby causing damage to the bearing shell due to dry wear.

[0039] The following embodiments provide an engine pre-oil supply system and method. A sub-oil tank and a supporting pipeline, valve, and sensor are added to the existing lubrication system to form four oil supply branches that cooperate with each other to address the problem of poor lubrication caused by the increase in the viscosity of the engine oil.

[0040] Embodiment 1

[0041] The present embodiment is as shown in FIG. 1, in which the engine oil filter 1 corresponds to the first engine oil filter in the foregoing, Figure 2 the engine oil filter 2 corresponds to the second engine oil filter in the foregoing, Figure 2 the electromagnetic valve 1 corresponds to the first electromagnetic valve in the foregoing, Figure 2 the electromagnetic valve 2 corresponds to the second electromagnetic valve in the foregoing, and the pre-oil supply pump 1 corresponds to the first pre-oil supply pump in the foregoing, Figure 2 the pre-oil supply pump 2 corresponds to the second pre-oil supply pump in the foregoing, Figure 2 the branch 1 corresponds to the branch ① in the foregoing, Figure 2 the branch 2 corresponds to the branch ② in the foregoing, Figure 2 the branch 3 corresponds to the branch ③ in the foregoing, Figure 2 the branch 3 corresponds to the branch ③ in the foregoing, Figure 2 the branch 3 corresponds to the branch ③ in the foregoing, Figure 2Branch 4 in the text corresponds to branch ④ in the previous text.

[0042] like Figure 2 As shown, an engine pre-fueling system includes a main fuel tank and an auxiliary fuel tank. The auxiliary fuel tank is equipped with a heating device and a level sensor. In this embodiment, the main fuel tank is located at the oil pan.

[0043] The main oil tank is connected to the oil pump and the main oil passage in sequence through pipes to form branch ②; branch ② is equipped with a thermostat, an oil cooler and an oil filter 1. The outlet of the oil pump is connected to the thermostat and the oil filter 1 in sequence through pipes and then connected to the main oil tank. The oil filter 1 has a bypass valve connected in parallel with it.

[0044] The auxiliary oil tank is connected to the outlet of the pre-supply pump 1 and the oil pump in sequence through pipes to form branch ①; the branch ① is equipped with solenoid valve 1 and oil filter 2. The inlet of the pre-supply pump 1 is connected to the main oil tank, and the outlet of the pre-supply pump 1 is connected to the solenoid valve 1 and the oil filter 2 in sequence through pipes and then connected to the auxiliary oil tank; the solenoid valve 1 is a two-position three-way solenoid valve. The first port is connected to the outlet of the pre-supply pump 1 through a pipe, the second port is connected to the oil filter 2 through a pipe, and the third port is connected to the outlet of the oil pump through a pipe.

[0045] The auxiliary oil tank is connected to the pre-supply pump 2 and the main oil passage in sequence through pipelines to form a branch ③; a one-way valve is installed on the pipeline between the outlet of the pre-supply pump 2 and the main oil passage;

[0046] The auxiliary oil tank is connected to the main oil passage through a pipeline to form a branch line ④; a solenoid valve 2 is installed on the pipeline between the auxiliary oil tank and the main oil passage.

[0047] Branch ①: When the engine is started for the first time, solenoid valve 1 is switched to position 1, enabling pre-supply pump 1 to pump lubricating oil from the main oil tank into the auxiliary oil tank. This branch is equipped with an oil filter 2 to ensure the cleanliness of the oil in the auxiliary oil tank. When the engine is started for the first time and the oil pump is finished, pre-supply pump 1 is used as a backup oil pump. When the oil pump fails to work or needs to be stopped for inspection, solenoid valve 1 is switched to position 2, and lubricating oil from the main oil tank is sent to the thermostat in branch ② through pre-supply pump 1, playing the same role as the oil pump.

[0048] Branch ②: Pre-supply oil circuit when the engine starts at normal temperature, which is consistent with the current lubrication system; during operation, the lubricating oil in the main oil tank is sent to the main oil passage through the oil pump in sequence via the thermostat and oil filter 1 to participate in the lubrication cycle.

[0049] Branch ③: Heating device (for engine cold starts) Figure 2The heating rod in the auxiliary oil tank is activated to heat the lubricating oil in the auxiliary oil tank to the set temperature. The pre-supply oil pump 2 pumps the heated lubricating oil from the auxiliary oil tank into the main oil passage through a one-way valve for lubrication circulation, so as to ensure that there is always lubricating oil in the bearing area when the engine starts at low temperature, and to avoid dry friction.

[0050] Branch line ④: Auxiliary oil tank replenishment branch line, which is connected to the main oil passage and controlled by solenoid valve 2. According to... Figure 3 The opening characteristic of the main oil passage pressure relief valve shown prioritizes the connection time of branch line ④ over the opening time of the pressure relief valve. This ensures that when the engine is operating normally, the oil pressure released during pressure fluctuations in the main oil passage first enters the auxiliary oil tank. Once the level in the auxiliary oil tank exceeds the set value, the oil returns to the main oil tank, thereby reducing the impact on the pressure of the main oil passage.

[0051] By adding an auxiliary oil tank and matching pipelines, valves, and sensors to the existing engine lubrication system, four mutually cooperating oil supply branches are formed to address the problem of poor lubrication caused by increased oil viscosity in low-temperature environments, as well as the problem of excessively high pressure in the main oil passage.

[0052] Example 2:

[0053] like Figure 4 As shown, the system implementation method for engine pre-fueling based on Embodiment 1 includes the following steps:

[0054] If it is the first start of the engine, branch ① will work, solenoid valve 1 will be switched to position 1, and pre-supply pump 1 will pump lubricating oil from the main oil tank into the auxiliary oil tank. When the auxiliary oil tank level reaches the set value, pre-supply pump 1 will stop, and solenoid valve 1 will be closed or switched to position 2. If it is not the first start of the engine, branch ① will not work, pre-supply pump 1 will stop, and solenoid valve 1 will be closed or switched to position 2.

[0055] The main oil tank temperature (or oil pan temperature) is obtained. When the temperature is not greater than the set value T1, the auxiliary oil tank heating device is started. After heating to a temperature greater than the set value T1, branch ③ is activated, and the pre-supply pump 2 is started to pump the heated lubricating oil in the auxiliary oil tank into the main oil passage. When the temperature at the end of the oil passage is close to the set value T1 (for example, greater than 90% × T1), the engine is started.

[0056] When the temperature of the main oil tank (or the temperature of the oil pan) is greater than the set value T1, branch ② works, and the pre-supply pump 1 starts to pump the lubricating oil in the main oil tank into the main oil passage. When the pressure of the main oil passage is greater than the set value a, the engine starts. When the pressure of the main oil passage is not greater than the set value a, the pre-supply pump 1 continues to work for a set time period (t1) and continues to judge the pressure of the main oil passage until the engine starting conditions are met.

[0057] During the engine operation, when the main oil passage pressure is greater than the set value b, the electromagnetic valve 2 is opened to make the branch 4 work, the liquid level in the auxiliary oil tank is judged, when the liquid level does not exceed the high position, the lubricating oil released in the main oil passage due to the excessively high pressure is discharged into the auxiliary oil tank through the branch 4, then the electromagnetic valve 2 is closed; if it exceeds the high position, the lubricating oil is discharged into the main oil tank or the designated position.

[0058] By adding the auxiliary oil tank and the matched pipeline, valve and sensor and other devices in the existing engine lubricating system, four oil supply branches are formed to cooperate with each other, so as to solve the problem of poor lubrication caused by the increased viscosity of the oil in the low temperature environment and the problem of the excessively high pressure of the main oil passage.

[0059] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for operating an engine pre-fuel supply system, characterized in that, The engine pre-fuel system includes: The main oil tank is connected to the oil pump and the main oil passage via pipes. The auxiliary oil tank is connected to the main oil passage and the outlet of the oil pump through corresponding pipes. The pipe connected to the oil pump inlet is equipped with a first pre-supply pump, and the pipe connected to the main oil passage is equipped with a second pre-supply pump. The auxiliary oil tank is equipped with a heating device. The inlet of the oil pump is connected to the main oil tank, and the outlet of the oil pump is connected in sequence to the thermostat, the first oil filter and the main oil passage through a pipeline. The first oil filter has a bypass valve arranged in parallel with it. The inlet of the first pre-supply oil pump is connected to the main oil tank, the outlet is connected to the first interface of the first solenoid valve, the second interface of the first solenoid valve is connected to the second oil filter and the auxiliary oil tank through a pipeline, and the third interface of the first solenoid valve is connected to the oil pump outlet. The operation method of the engine pre-fuel supply system includes the following steps: Based on whether the engine is starting for the first time, determine whether the first interface and the third interface of the first solenoid valve are connected. When the temperature of the main oil tank is not greater than the set value T1, the heating device of the auxiliary oil tank is activated. After heating to a temperature greater than T1, the second pre-supply oil pump is activated to pump the heated lubricating oil in the auxiliary oil tank into the main oil passage. When the temperature at the end of the oil passage is greater than 90%×T1, the engine is started. When the temperature of the main oil tank is greater than the set value T1, the first pre-supply oil pump starts to pump the lubricating oil in the main oil tank into the main oil passage. When the pressure in the main oil passage is greater than the set value a, the engine starts. If the pressure in the main oil passage is not greater than the set value a, the engine starting conditions are determined based on the working time of the first pre-supply oil pump. When the engine starts, the oil pump works, and the first pre-supply oil pump stops at the same time; Specifically, based on whether the engine is starting for the first time, the connection between the first and third interfaces of the first solenoid valve is determined as follows: If the engine is starting for the first time, the first port of the first solenoid valve is connected to the second port, and the first pre-supply oil pump pumps the lubricating oil in the main oil tank into the auxiliary oil tank. After reaching the set level, the first pre-supply oil pump stops, and the first solenoid valve is activated to connect the first port to the third port. If the engine is not starting for the first time, the first pre-supply pump stops, and the first port of the first solenoid valve connects to the third port.

2. The operating method of the engine pre-fuel supply system as described in claim 1, characterized in that, The first interface of the first solenoid valve is connected to the second interface, or the first interface is connected to the third interface.

3. The operating method of an engine pre-fuel supply system as described in claim 1, characterized in that, The inlet of the second pre-supply oil pump is connected to the auxiliary oil tank, and the outlet is connected to the main oil passage through a pipeline, which is equipped with a check valve.

4. The operating method of an engine pre-fuel supply system as described in claim 1, characterized in that, The auxiliary oil tank is connected to the main oil passage via a pipeline, and a second solenoid valve is installed on the pipeline.

5. The operating method of an engine pre-fuel supply system as described in claim 1, characterized in that, The main oil passage is equipped with a pressure sensor and a pressure relief valve, and the auxiliary oil tank is equipped with a liquid level sensor. The opening sequence of the second solenoid valve and the pressure relief valve is determined according to the pressure of the main oil passage and the liquid level of the auxiliary oil tank.

6. The operating method of an engine pre-fuel supply system as described in claim 1, characterized in that, During engine operation, if the pressure in the main oil passage is greater than the set value b, and the level in the auxiliary oil tank does not exceed the set position, the second solenoid valve opens, draining the lubricating oil in the main oil passage into the auxiliary oil tank, and then the second solenoid valve closes; if the level in the auxiliary oil tank exceeds the set position, the second solenoid valve remains closed, and the lubricating oil drains into the main oil tank or the set area.

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