Double-layer oil pan and method for improving cold start of engine

Abstract

The invention discloses a double-layer oil pan for improving cold start of an engine, which comprises an oil pan and a parking heater system, the oil pan is a double-layer oil pan and comprises an inner shell and an outer shell, a containing cavity is arranged between the inner shell and the outer shell, and the front end and the rear end of the outer shell are respectively provided with an inlet and an outlet which are communicated with the containing cavity; the parking heater system comprises a heat exchanger, a water tank, a first water pump and a parking heater, the water tank, the first water pump, the parking heater and the heat exchanger are connected in series to form a parking circulating water path, the rear end of the degassing pipe is connected with an inlet of the oil pan containing cavity, and the rear end of the degassing pipe is connected with an exhaust pipe. The front end of the smoke outlet is connected with a parking heater; the rear end of the exhaust pipe is connected with an outlet of the oil pan containing cavity, and the front end of the exhaust pipe is communicated with the atmospheric environment. Engine oil in the oil pan is heated through waste heat of the parking heater, and meanwhile the starting time of the engine can be shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engines, in particular to a double-layer oil pan and method for improving cold start of an engine. BACKGROUND

[0002] The engine lubrication system is an important system for ensuring the normal operation of the engine. The main function of the lubrication system is to continuously deliver clean engine oil to the friction surfaces of various parts of the engine to reduce friction and wear of the parts, and also to cool, clean, seal, and buffer.

[0003] The parking heater is a vehicle-mounted heating device independent of the engine of the vehicle, which can preheat and warm up the engine and cab of the vehicle parked in a low-temperature cold environment without starting the engine. The parking heater is of great benefit to the cold start of the vehicle in a low-temperature environment. Today, in cold regions, the parking heater has become a standard configuration of many vehicles. The working principle of the parking heater is as follows: Combustion air enters the combustion chamber through the air inlet system, mixes with the fuel in the combustion chamber to form a combustible mixture, then ignites and burns to form a heating flame into the combustion cylinder, and heat transfer is achieved through the heat exchange system to achieve the purpose of rapid preheating and warming up. For example, the existing patent document CN118457161A discloses a cyclone parking heater with a preheating structure, and the existing patent document CN118372613A discloses a gas-water integrated parking heater heat exchange method. For another example, the parking heater of Eberspacher Company can heat the vehicle to the desired temperature without starting the engine, greatly improving the safety and comfort of vehicle use.

[0004] The existing patent document CN119531987A discloses a double-layer oil pan lubrication system integrated with an air conditioner, which replaces the original oil cooler for heat dissipation and improves the structural strength, and the NVH of the engine is also improved.

[0005] The disclosure of the above background art is only used to assist in understanding the concept and technical solutions of the present application, and does not necessarily belong to the prior art of the present patent application. In the absence of explicit evidence that the above content has been disclosed on the filing date of the present patent application, the above background art should not be used to evaluate the novelty and inventiveness of the present application. SUMMARY

[0006] The present application aims to provide a double-layer oil pan and method for improving the cold start of an engine to solve the technical problem of long start-up time when the engine is cold started.

[0007] To this end, the present application provides a double-layer oil pan and method for improving the cold start of an engine.

[0008] Preferably, the present application can also have the following technical features:

[0009] The double-layer oil pan for improving the cold start of an engine comprises an oil pan and a parking heater system, the oil pan is a double-layer oil pan comprising an inner shell and an outer shell, a containing cavity is arranged between the inner shell and the outer shell, and an inlet and an outlet communicating with the containing cavity are arranged at the front end and the rear end of the outer shell respectively; the parking heater system comprises a heat exchanger, a water tank, a first water pump and a parking heater, the water tank, the first water pump, the parking heater and the heat exchanger are connected in series to form a parking circulating water circuit, and the parking circulating water circuit further comprises a degassing pipe and an exhaust pipe, wherein the rear end of the degassing pipe is connected to the inlet of the containing cavity of the oil pan, and the front end of the degassing pipe is connected to the exhaust port of the parking heater; the rear end of the exhaust pipe is connected to the outlet of the containing cavity of the oil pan, and the front end of the exhaust pipe is connected to the atmospheric environment.

[0010] Further, the two sides of the containing cavity are also respectively provided with symmetrically arranged baffles, and the two sides of the baffles are respectively connected to the outer side of the inner shell and the inner side of the outer shell.

[0011] Further, the lower end of the baffle is located above the bottom surface of the inner shell, and the upper end of the baffle is located below the upper end surface of the inner shell.

[0012] Further, the baffle is arranged in an inclined manner, the lower end of the baffle is close to the inlet side, and the upper end of the baffle extends obliquely to the outlet side.

[0013] Further, the front end and the rear end of the inner shell are respectively provided with stepped surfaces, and at least one vertical partition plate is arranged in the middle part of the inner shell, wherein the outer sides of the front end and the rear end of the inner shell are respectively provided with concave surfaces, and the concave surfaces form first and second stepped surfaces in the interior of the inner shell.

[0014] Further, the position of the inlet is arranged on the outer shell corresponding to the concave surface of the front end of the inner shell; a clamping cavity is formed between the rear end of the outer shell and the rear end of the inner shell, the clamping cavity is part of the containing cavity, and the outlet communicates with the clamping cavity.

[0015] Further, the partition plate is in an n-shaped structure, the two sides and the lower end of the partition plate abut against the two sides and the bottom surface of the inner shell respectively, and an oil passage is arranged in the lower part of the partition plate.

[0016] Further, the partition plate is welded to the side wall of the inner shell.

[0017] Further, the partition plate is detachably assembled to the side wall of the inner shell, the side wall of the inner shell is provided with a mounting block, the mounting block is provided with a mounting groove which is vertically arranged and matches the thickness of the partition plate, and the partition plate is clamped in the mounting groove.

[0018] A method for improving engine cold start by using the combustion flue gas of a parking heater, comprising the double-layer oil sump described above, and further comprising the following steps:

[0019] S101, the ECU is powered on, and the current engine coolant temperature is obtained; if the engine coolant temperature is lower than-15 DEG C or the oil sump oil temperature is lower than-15 DEG C, the engine is suspended to start, and the vehicle controller gives an instruction, which includes controlling the parking heater system to start;

[0020] S102, the oil sump oil temperature and the engine water jacket coolant temperature are monitored, the flue gas generated by the parking heater combustion is introduced into the double-layer oil sump containing cavity through the gas removal pipe; when the coolant temperature in the engine water jacket is higher than-4 DEG C and the oil temperature is higher than-10 DEG C, the parking heater system stops working, and the engine starts to start.

[0021] The beneficial effects of the present application compared with the prior art include: on the basis of the design of the double-layer oil sump, the high-temperature flue gas generated by the parking heater combustion is introduced into the containing cavity of the oil sump, the residual heat of the flue gas is used to heat the oil sump, and then the oil temperature in the oil sump is increased. That is, the flue gas generated by the parking heater combustion is discharged into the containing cavity through the gas removal pipe to heat the oil sump, and the flue gas is discharged into the atmosphere through the exhaust pipe after coming out of the containing cavity. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a sectional view of the present application.

[0023] Figure 2 is a baffle arrangement schematic diagram of the present application.

[0024] Figure 3 is a front view of the present application.

[0025] Figure 4 is a top view of the present application.

[0026] Figure 5 is a perspective view of the present application.

[0027] Figure 6 is a parking heater connection schematic diagram of the present application.

[0028] Figure 7 is a method control flowchart of the present application. DETAILED DESCRIPTION

[0029] The present application will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope of the present application and its applications.

[0030] With reference to the following drawings, non-limiting and non-exclusive embodiments will be described, in which the same reference numerals indicate the same parts, unless otherwise specifically indicated.

[0031] As Figures 1-6 shown in one of the embodiments of the application, a double-layer oil sump for improving cold start of an engine, comprising an oil sump 16 and a parking heater system, the oil sump 16 is a double-layer oil sump, which comprises an inner sump 2 and an outer sump 1, a containing cavity 8 is arranged between the inner sump 2 and the outer sump 1, the outer sump 1 is respectively provided with an inlet 4 and an outlet 3 at the front and rear ends thereof, the inlet 4 is arranged at a lower height than the outlet 3, the parking heater system comprises a heat exchanger 11, a water tank 12, a first water pump 13 (a water pump provided with the parking heater), and a parking heater 14, the water tank 12, the first water pump 13, the parking heater 14, and the heat exchanger 11 are connected in series to form a parking circulation water circuit, the cooling liquid in the parking circulation water circuit is heated by the parking heater 14, and then the cooling liquid exchanges heat with the cooling liquid in the engine cooling circulation system through the heat exchanger 11, so as to preheat the engine, thereby facilitating the rapid start of the engine in a low-temperature condition. For example, in the prior art, such as the patent document CN118372613A, a gas-water integrated parking heater heat exchange method is disclosed, which usually connects the engine water jacket (cylinder block water jacket and cylinder head water jacket), a second water pump 15, and the heat exchanger 11 in series to form a preheating circulation pipeline. In operation, the parking circulation water circuit and the preheating circulation pipeline exchange heat through the heat exchanger 11, and then the engine (cylinder block and cylinder head) is heated to a certain temperature before starting the engine. However, the parking heater 11 used in the prior art only heats the engine, without heating the oil in the oil sump 16, resulting in the need to preheat the engine to a higher temperature, long preheating time, and high energy consumption. As an improvement, to further improve the cold start of the engine, a gas removal pipe 19 and an exhaust pipe 20 are provided, wherein the rear end of the gas removal pipe 19 is connected to the inlet 4 of the containing cavity 8 of the oil sump 16, and the front end is connected to the exhaust port of the parking heater 14; the rear end of the exhaust pipe 20 is connected to the outlet 3 of the containing cavity 8 of the oil sump 16, and the front end is connected to the atmospheric environment. Preferably, the outside of the gas removal pipe 19, and the outside of the oil sump 16 are provided with a heat preservation layer, such as pasting heat preservation cotton, to reduce the heat loss of the flue gas.

[0032] In the above embodiment, during the combustion operation of the parking heater 14, the high-temperature flue gas generated reaches more than 600°C. The flue gas is generally directly discharged into the environment without being fully utilized. Therefore, on the basis of the design of the double-layer oil sump, the high-temperature flue gas generated by the combustion of the parking heater 14 is introduced into the containing cavity 8 of the oil sump 16, and the residual heat of the flue gas is used to heat the oil sump 16. That is, the flue gas generated by the combustion of the parking heater 14 is discharged into the containing cavity 8 through the gas removal pipe 19, and then discharged into the atmospheric environment through the exhaust pipe 20.

[0033] In the preferred embodiment, two sides of the accommodating cavity 8 are respectively provided with symmetrically arranged baffles 7, two sides of the baffle 7 are respectively connected to the outer side of the inner shell 2 and the inner side of the outer shell 1, the lower end of the baffle 7 is located above the bottom surface of the inner shell 2, and the upper end is located below the upper end surface of the inner shell 2. The baffle 7 separates the middle part of the side surface of the accommodating cavity 8, forms a passage at the upper and lower ends of the accommodating cavity 8, so that the medium entering the accommodating cavity 8 can pass through the passage formed by the upper and lower ends of the baffle 7, which is beneficial to strengthen the contact between the medium and the inner shell 2 of the oil pan for heat exchange.

[0034] Preferably, the baffle 7 is arranged obliquely, the lower end of the baffle 7 is close to the inlet side, and the upper end extends obliquely to the outlet 3 side.

[0035] Preferably, the front and rear ends of the inner shell 2 are respectively provided with stepped surfaces, and the middle part is provided with at least one vertically arranged partition plate 5. The outer sides of the front and rear ends of the inner shell 2 are respectively provided with concave surfaces (23, 24), which form first and second stepped surfaces 21 and 22 inside the inner shell 2, and also make the inner cavity of the inner shell 2 have a structure of small at the bottom and large at the top. The position of the inlet 4 is arranged on the outer shell 1 corresponding to the inner concave surface 23 of the front end of the inner shell 2, so that the medium entering the accommodating cavity 8 from the inlet 4 is not blocked, and the passing property is increased. The rear end of the outer shell 1 and the rear end of the inner shell 2 form a vertical clamping cavity 81, the clamping cavity 81 is part of the accommodating cavity 8, and the outlet 3 communicates with the clamping cavity 81.

[0036] The partition plate 5 has an n-shaped structure, the two sides and the lower end of the partition plate 5 respectively abut the two sides and the bottom surface of the inner shell 2, and the lower part of the partition plate 5 is provided with an oil passing hole 51. Preferably, the partition plate 5 is provided with two, including a first partition plate and a second partition plate, and the first partition plate and the second partition plate divide the inner shell 2 into three regions.

[0037] In one installation example of the partition plate 5, the partition plate 5 is welded to the side wall of the inner shell 2. In this way, the engine oil at the bottom of the inner shell 2 flows through the oil passing hole 51.

[0038] In combination Figure 1 and 5 , in another installation example of the partition plate 5, the partition plate 5 is detachably assembled to the side wall of the inner shell 2. For example, the side wall of the inner shell 2 is provided with a mounting block 6, the mounting block 6 is provided with a mounting groove with a thickness matched with that of the partition plate 5 and arranged vertically, and the partition plate 5 is clamped in the mounting groove. Preferably, the partition plate 5 and the mounting groove are interference fit.

[0039] In order to facilitate the discharge of the oil pan 16 of the engine oil, the bottom of the inner shell 2 is provided with a drain valve, the opening of which penetrates the outer side of the outer shell 1. When the drain valve is opened, the engine oil of the inner shell 2 is discharged from the drain valve. The top of the inner shell 2 is also provided with a plurality of reinforcing ribs 9, the two ends of which are connected to the two sides of the inner shell 2, respectively.

[0040] Referring to Figure 7 A method for improving the cold start of an engine using the combustion fumes of a parking heater, comprising the aforementioned double oil pan, further comprising the steps of:

[0041] S101, the ECU is powered on, and the current engine coolant temperature is obtained. If the engine coolant temperature is lower than -15℃, or the oil pan 16 engine oil temperature is lower than -15℃, the engine is suspended, and the vehicle controller gives instructions, including controlling the parking heater system to start the heating preheating cycle pipeline to preheat the engine coolant;

[0042] S102, monitor the oil pan oil temperature and the coolant temperature in the preheating cycle pipeline, and guide the fumes generated by the parking heater combustion into the double oil pan containing cavity. When the coolant temperature in the preheating cycle pipeline is higher than -4℃, and the engine oil temperature is higher than -10℃, the parking heater system stops working, and the engine starts.

[0043] Those skilled in the art will recognize that numerous modifications can be made to the above description, and that the embodiments and figures are only used to describe one or more specific implementations.

[0044] Although the exemplary embodiments of the present application have been described and illustrated, it is to be understood that a variety of changes might be made therein without departing from the spirit of the present application. Further, it is intended that all such modifications fall within the scope of the present application. Accordingly, the present application is not limited to the specific embodiments described herein, but only by the scope of the appended claims.

Claims

1. A double-layered oil pan for improving engine cold start, comprising an oil pan and a parking heater system, wherein the oil pan is a double-layered oil pan, comprising an inner shell and an outer shell, wherein a cavity is provided between the inner shell and the outer shell, and an inlet and an outlet communicating with the cavity are respectively provided at the front and rear ends of the outer shell; the parking heater system comprises a heat exchanger, a water tank, a first water pump, and a parking heater, wherein the water tank, the first water pump, the parking heater, and the heat exchanger are connected in series to form a parking circulating water circuit, characterized in that: It also includes a degassing pipe and an exhaust pipe, wherein the rear end of the degassing pipe is connected to the inlet of the oil pan cavity and the front end is connected to the exhaust port of the parking heater; the rear end of the exhaust pipe is connected to the outlet of the oil pan cavity and the front end is connected to the atmospheric environment.

2. The double-layer oil pan for improving engine cold start as described in claim 1, characterized in that: The cavity is provided with symmetrically arranged baffles on both sides, and the two sides of the baffles are respectively connected to the outer side of the inner shell and the inner side of the outer shell.

3. A double-layer oil pan for improving engine cold start as described in claim 2, characterized in that: The lower end of the baffle is located above the bottom surface of the inner shell, and the upper end is located below the upper surface of the inner shell.

4. A double-layer oil pan for improving engine cold start as described in claim 2, characterized in that: The baffle is inclined, with its lower end close to the inlet side and its upper end extending obliquely towards the outlet side.

5. A double-layer oil pan for improving engine cold start as described in claim 1, characterized in that: The inner shell has stepped surfaces at both ends and at the middle, and at least one vertically placed partition. The outer sides of the front and rear ends of the inner shell have concave surfaces, which form a first stepped surface and a second stepped surface inside the inner shell.

6. A double-layer oil pan for improving engine cold start as described in claim 5, characterized in that: The inlet is located on the outer shell corresponding to the concave surface at the front end of the inner shell; a cavity is formed between the rear end of the outer shell and the rear end of the inner shell, the cavity being part of the accommodating cavity, and the outlet is connected to the cavity.

7. A double-layer oil pan for improving engine cold start as described in claim 5, characterized in that: The partition has an n-shaped structure, with its two sides and lower end abutting against the two sides and bottom surface of the inner shell, respectively, and an oil passage hole is provided at its lower part.

8. A double-layer oil pan for improving engine cold start as described in claim 7, characterized in that: The partition is welded to the side wall of the inner shell.

9. A double-layer oil pan for improving engine cold start as described in claim 7, characterized in that: The partition is detachably assembled to the side wall of the inner shell. The side wall of the inner shell is provided with a mounting block. The mounting block is provided with a vertically arranged mounting groove that matches the thickness of the partition. The partition is snapped into the mounting groove.

10. A method for improving engine cold start using combustion flue gas from a parking heater, comprising the double-layered oil pan as described in claim 1, characterized in that: It also includes the following steps: S101: When the ECU is powered on, it obtains the current engine coolant temperature. If the engine coolant temperature is below -15℃ or the oil temperature in the oil pan is below -15℃, the engine will pause starting. The vehicle controller will issue instructions, including controlling the parking heater system to start. S102. Monitor the oil temperature in the oil pan and the coolant temperature in the engine water jacket. Guide the flue gas generated by the combustion of the parking heater into the cavity of the double-layer oil pan through the degassing pipe. When the coolant temperature in the engine water jacket is higher than -4℃ and the oil temperature is higher than -10℃, the parking heater system stops working and the engine starts.

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