Cold start mechanism, power system and vehicle

Abstract

The utility model belongs to vehicle technical field discloses a cold start mechanism, power system and vehicle. The cold start mechanism includes cold start oil circuit, cold start valve, control unit and temperature sensor. Cold start oil circuit is connected between the oil inlet of the oil tank of power system and the oil inlet of transmission, cold start valve is arranged in the cold start oil circuit, and the transmission is selectively connected to the oil tank through the cold start valve, and when the cold start valve opens, the oil in the cold start oil circuit can be unloaded to the oil tank. The cold start valve and the temperature sensor are respectively communicated and connected to the control unit, the temperature sensor is configured to detect the oil temperature at the oil tank, the control unit can receive the temperature signal of the temperature sensor, and can control the cold start valve to open. The cold start mechanism can realize the cold start of the engine under the condition of low temperature, and realizes the simplification of structure under the premise of guaranteeing the cold start function.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to a cold start mechanism, a power system, and a vehicle. Background Technology

[0002] A hydraulic-mechanical continuously variable transmission (CVT) is a composite transmission device that achieves continuously variable speed through the parallel operation of hydraulic and mechanical transmissions. Its core consists of a hydraulic speed regulating mechanism, a mechanical speed changing mechanism, and a torque converter, forming a parallel transmission of hydraulic and mechanical power flows. The hydraulic-mechanical CVT can achieve continuous speed ratio changes by adjusting the hydraulic pump displacement, and simultaneously utilizes components such as planetary gear sets and synchronous clutches to complete power splitting and merging, featuring high transmission efficiency and a wide speed range. However, when starting a hydraulic-mechanical CVT at low temperatures, the following problem arises: The low temperature causes excessively high oil viscosity, resulting in significant viscous resistance and excessively high starting torque for the oil pump. The engine cannot overcome this starting torque, leading to vehicle start-up failure.

[0003] The existing method involves installing a clutch at the connection point between the hydraulic continuously variable transmission (CVT) and the engine to disconnect the transmission system between the engine and the CVT. Through manual control, the clutch is engaged again when the engine output torque exceeds the starting torque of the CVT, thereby driving the CVT to work. This avoids the problem of vehicle starting failure due to excessive starting torque of the CVT.

[0004] However, the above method has the following problems: the clutch structure is complex and the manufacturing and installation costs are high. It requires a large installation space and corresponding oil passages. Moreover, the current structure requires manual control, which places high demands on the space of the hydraulic mechanical continuously variable transmission and the operator. It is impossible to upgrade the cold start function on the hydraulic mechanical continuously variable transmission with the final design.

[0005] Therefore, there is an urgent need for a cold start mechanism, power system, and vehicle to solve the above problems. Utility Model Content

[0006] According to one aspect of the present invention, the objective is to provide a cold start mechanism that enables cold starting of an engine under low temperature conditions, while simplifying the structure while ensuring the cold start function.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] Cold start mechanism, including:

[0009] The cold start oil circuit connects the oil inlet of the powertrain's oil tank to the oil inlet of the transmission.

[0010] A cold start valve is provided in the cold start oil circuit. The transmission is selectively connected to the oil tank through the cold start valve. When the cold start valve is opened, the oil in the cold start oil circuit can be discharged to the oil tank.

[0011] The control unit and the temperature sensor are respectively communicatively connected to the control unit. The temperature sensor is configured to detect the oil temperature at the oil tank. The control unit can receive the temperature signal from the temperature sensor and control the cold start valve to open.

[0012] As a preferred embodiment of the cold start mechanism provided by this utility model, the cold start mechanism further includes a first check valve, which is disposed in the cold start oil circuit and configured to restrict the flow of oil in the cold start oil circuit from the oil inlet of the transmission to the oil tank.

[0013] As a preferred embodiment of the cold start mechanism provided by this utility model, the temperature sensor is disposed at the oil outlet of the oil tank.

[0014] As a preferred embodiment of the cold start mechanism provided by this utility model, the cold start mechanism further includes an oil supply circuit, which is connected between the oil outlet of the oil tank and the oil inlet of the transmission. The oil in the oil tank can flow to the transmission through the oil supply circuit. The inlet of the cold start circuit is located upstream of the oil inlet of the transmission and is connected to the oil supply circuit.

[0015] As a preferred embodiment of the cold start mechanism provided by this utility model, the cold start mechanism further includes an oil pump assembly, which is disposed in the oil supply circuit and configured to pump oil from the oil tank to the transmission.

[0016] As a preferred embodiment of the cold start mechanism provided by this utility model, the cold start mechanism further includes a filter assembly, which is disposed in the oil supply circuit and located between the oil pump assembly and the oil tank. The filter assembly is configured to filter the oil.

[0017] As a preferred embodiment of the cold start mechanism provided by this utility model, the cold start mechanism further includes a second one-way valve, which is disposed in the oil supply circuit and configured to restrict the flow of oil in the oil supply circuit from the oil outlet of the oil tank to the oil inlet of the transmission.

[0018] As a preferred embodiment of the cold start mechanism provided by this utility model, the cold start mechanism further includes an engine speed detection device, which is communicatively connected to the control unit and configured to detect the engine speed of the power system. The control unit is able to receive the speed signal from the engine speed detection device and control the cold start valve to close.

[0019] According to another aspect of the present invention, the object is to provide a power system comprising a fuel tank, a transmission, and an engine, and further comprising a cold start mechanism as described in any of the above embodiments, wherein the engine is connected to the fuel tank and the fuel tank is capable of providing power oil to the engine, the transmission is connected to the output end of the engine and connected to the fuel tank, and the fuel tank is capable of providing lubricating oil to the transmission.

[0020] According to another aspect of the present invention, the object is to provide a vehicle comprising wheels and a power system as described above, the wheels being connected to the output end of the transmission.

[0021] The beneficial effects of this utility model are:

[0022] The cold start mechanism provided by this utility model includes a cold start oil circuit, a cold start valve, a control unit, and a temperature sensor. The cold start oil circuit connects the oil inlet of the powertrain's oil tank and the oil inlet of the transmission. The cold start valve is located in the cold start oil circuit, and the transmission is selectively connected to the oil tank via the cold start valve. When the cold start valve opens, the oil in the cold start oil circuit can be discharged into the oil tank. Through the aforementioned cold start oil circuit, the lubricating oil about to enter the transmission's oil inlet can be unloaded, reducing the amount of lubricating oil in the transmission and simplifying the structure. During initial starts at low engine speeds and temperatures, it avoids the problem of excessively high oil viscosity and starting torque due to low temperatures, thus ensuring the cold start function. The cold start valve and the temperature sensor are communicatively connected to the control unit. The temperature sensor is configured to detect the oil temperature at the oil tank, and the control unit can receive the temperature signal from the temperature sensor and control the opening of the cold start valve. The aforementioned control unit can automatically unload the oil in the cold start oil circuit when the oil temperature at the oil tank is too low, thereby improving the automation level of the cold start mechanism. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the cold start mechanism provided in an embodiment of the present utility model;

[0025] Figure 2 This is a schematic diagram of the cold start valve provided in an embodiment of the present invention.

[0026] In the picture:

[0027] 10. Fuel tank;

[0028] 100. Cold start oil circuit;

[0029] 200. Cold start valve; 210. Cold start oil passage; 211. First branch; 212. Second branch; 220. Sealing component;

[0030] 300. Temperature sensor;

[0031] 400. Fuel supply line;

[0032] 500. Oil pump assembly;

[0033] 600. Filter components. Detailed Implementation

[0034] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connect," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In this embodiment, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0042] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0043] This embodiment provides a cold start mechanism, a power system, and a vehicle. The power system includes a fuel tank 10, a transmission, and an engine, as well as the cold start mechanism provided in this embodiment. The vehicle includes wheels and the aforementioned power system. The engine is connected to the fuel tank 10, which provides power oil to the engine. The transmission is connected to the output end of the engine and to the fuel tank 10, which provides lubricating oil to the transmission. The wheels are connected to the output end of the transmission. The engine outputs power to drive the wheels, and the transmission optimizes the engine's output efficiency.

[0044] Figure 1 A schematic diagram of the cold start mechanism provided in an embodiment of the present invention is shown. (Refer to...) Figure 1 The cold start mechanism provided in this embodiment includes a cold start oil circuit 100, a cold start valve 200, a control unit, and a temperature sensor 300. The cold start oil circuit 100 connects the oil inlet of the powertrain's oil tank 10 and the oil inlet of the transmission. The cold start valve 200 is disposed in the cold start oil circuit 100, and the transmission is selectively connected to the oil tank 10 through the cold start valve 200. When the cold start valve 200 is open, the oil in the cold start oil circuit 100 can be discharged into the oil tank 10. Through the aforementioned cold start oil circuit 100, the lubricating oil about to enter the transmission's oil inlet can be unloaded, reducing the amount of lubricating oil in the transmission. This eliminates the need for a clutch between the transmission and the engine, simplifying the structure. During initial starts at low engine speeds and temperatures, it avoids the problem of excessively high oil viscosity in the transmission due to low temperatures, which could lead to excessive starting torque and affect the normal starting of the engine, thus ensuring the cold start function.

[0045] Specifically, the cold start valve 200 and the temperature sensor 300 are communicatively connected to the control unit. The temperature sensor 300 is configured to detect the oil temperature at the oil tank 10. The control unit can receive the temperature signal from the temperature sensor 300 and control the cold start valve 200 to open when the oil temperature collected by the temperature sensor 300 is too low, thereby unloading the oil. Through the aforementioned control unit, the oil in the cold start oil circuit 100 can be automatically unloaded when the oil temperature at the oil tank 10 is too low, thereby improving the automation level of the cold start mechanism. In this embodiment, the control unit may specifically be a PLC controller, etc., and it can also be integrated into the vehicle's overall control system.

[0046] To be more specific, continue to refer to Figure 1 The temperature sensor 300 is located at the oil outlet of the oil tank 10. Specifically, the temperature sensor 300 can detect the oil temperature and, during engine cold starts, determine whether excessive transmission starting torque is due to excessively high oil viscosity at low temperatures or insufficient oil cleanliness. If the temperature sensor 300 detects that the oil temperature is within the normal engine starting temperature range, but the engine still fails to start, then the oil cleanliness needs to be checked.

[0047] More specifically, the cold start mechanism also includes a first check valve (not shown). This first check valve is disposed in the cold start oil circuit 100 and configured to restrict the flow of oil in the cold start oil circuit 100 from the transmission inlet to the oil tank 10. This configuration prevents backflow of oil in the cold start oil circuit 100. The aforementioned first check valve is prior art, and its structure and principle will not be described in detail in this embodiment.

[0048] More specifically, the cold start mechanism also includes an oil supply line 400. This oil supply line 400 connects the oil outlet of the oil tank 10 and the oil inlet of the transmission, allowing oil in the oil tank 10 to flow to the transmission via the oil supply line 400. The inlet of the cold start oil line 100 is located upstream of the transmission's oil inlet and is connected to the oil supply line 400. When the cold start valve 200 is opened, oil flowing to the transmission's oil inlet via the oil supply line 400 can be unloaded into the oil tank 10 via the cold start oil line 100, preventing it from continuing to flow downstream of the oil supply line 400, thus preventing oil in the oil supply line 400 from entering the transmission.

[0049] More specifically, the cold start mechanism also includes an oil pump assembly 500. The oil pump assembly 500 is disposed in the oil supply passage 400 and is configured to pump oil from the oil tank 10 to the transmission.

[0050] Preferably, the cold start mechanism further includes a filter assembly 600, which is disposed in the oil supply circuit 400, located between the oil pump assembly 500 and the oil tank 10. The filter assembly 600 is configured to filter the oil. By filtering the oil through the filter assembly 600, damage to the oil pump assembly 500 and gears in the transmission can be avoided when impurities are mixed in the oil in the oil tank 10.

[0051] Preferably, the cold start mechanism further includes a second check valve (not shown). This second check valve is disposed in the oil supply circuit 400 and configured to restrict the flow of oil in the oil supply circuit 400 from the outlet of the oil tank 10 to the inlet of the transmission. This configuration prevents backflow of oil in the oil supply circuit 400. The aforementioned second check valve is prior art, and its structure and principle will not be described in detail in this embodiment.

[0052] Preferably, the cold start mechanism further includes an engine speed detection device, which is communicatively connected to the control unit and configured to detect the engine speed of the power system. The control unit can receive the speed signal from the engine speed detection device and control the cold start valve 200 to close.

[0053] Figure 2 A schematic diagram of a cold start valve provided in an embodiment of this utility model is shown. (Refer to...) Figure 2 The cold start valve 200 provided in this embodiment specifically has a cold start oil passage 210. To accommodate the arrangement of various structures in existing power systems, the cold start oil passage 210 is specifically L-shaped, including a first branch 211 and a second branch 212 that are perpendicular to and interconnected with each other. The end of the first branch 211 furthest from the second branch 212 is specifically connected to the oil supply line 400 via the cold start oil passage 100, and the end of the second branch 212 furthest from the first branch 211 is specifically connected to the oil inlet of the oil tank 10 via the cold start oil passage 100. When the cold start valve 200 is opened, oil can flow in the first branch 211 and the second branch 212; when the cold start valve 200 is closed, the valve core of the cold start valve 200 can block the first branch 211 and the second branch 212.

[0054] Specifically, when processing the existing cold start valve 200, it is necessary to machine two mutually perpendicular channels from the outer wall of the cold start valve 200. Then, the openings of the two channels on the outer wall of the cold start valve 200 are sealed using a sealing member 220, thereby forming a first branch 211 and a second branch 212 in the cold start valve 200. In this embodiment, the sealing member 220 can be a sealing screw or the like.

[0055] The above description is merely a preferred embodiment of this utility model and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of disclosure involved in this utility model is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this utility model.

[0056] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A cold start mechanism, characterized in that, include: The cold start oil circuit (100) is connected between the oil inlet of the oil tank (10) of the power system and the oil inlet of the transmission; A cold start valve (200) is provided in the cold start oil circuit (100). The transmission is selectively connected to the oil tank (10) through the cold start valve (200). When the cold start valve (200) is opened, the oil in the cold start oil circuit (100) can be discharged to the oil tank (10). The control unit and the temperature sensor (300) are respectively communicatively connected to the control unit. The temperature sensor (300) is configured to detect the oil temperature at the oil tank (10). The control unit can receive the temperature signal from the temperature sensor (300) and can control the cold start valve (200) to open.

2. The cold start mechanism according to claim 1, characterized in that, The cold start mechanism further includes a first check valve, which is disposed in the cold start oil circuit (100) and configured to restrict the flow of oil in the cold start oil circuit (100) from the oil inlet of the transmission to the oil tank (10).

3. The cold start mechanism according to claim 1, characterized in that, The temperature sensor (300) is located at the oil outlet of the oil tank (10).

4. The cold start mechanism according to claim 1, characterized in that, The cold start mechanism also includes an oil supply line (400), which is connected between the oil outlet of the oil tank (10) and the oil inlet of the transmission. The oil in the oil tank (10) can flow to the transmission through the oil supply line (400). The inlet of the cold start oil line (100) is located upstream of the oil inlet of the transmission and is connected to the oil supply line (400).

5. The cold start mechanism according to claim 4, characterized in that, The cold start mechanism further includes an oil pump assembly (500) disposed in the oil supply circuit (400) and configured to pump oil from the oil tank (10) to the transmission.

6. The cold start mechanism according to claim 5, characterized in that, The cold start mechanism further includes a filter assembly (600), which is disposed in the oil supply circuit (400) and located between the oil pump assembly (500) and the oil tank (10). The filter assembly (600) is configured to filter oil.

7. The cold start mechanism according to claim 4, characterized in that, The cold start mechanism further includes a second check valve, which is disposed in the oil supply circuit (400) and configured to restrict the flow of oil in the oil supply circuit (400) from the oil outlet of the oil tank (10) to the oil inlet of the transmission.

8. The cold start mechanism according to claim 1, characterized in that, The cold start mechanism also includes an engine speed detection device, which is communicatively connected to the control unit and configured to detect the engine speed of the power system. The control unit is able to receive the speed signal from the engine speed detection device and control the cold start valve (200) to close.

9. A power system, characterized in that, The system includes an oil tank (10), a transmission, and an engine, and further includes a cold start mechanism as described in any one of claims 1-8, wherein the engine is connected to the oil tank (10) and the oil tank (10) is capable of providing power oil to the engine, the transmission is connected to the output end of the engine and to the oil tank (10), and the oil tank (10) is capable of providing lubricating oil to the transmission.

10. A vehicle, characterized in that, It includes wheels and the power system as described in claim 9, wherein the wheels are connected to the output end of the transmission.

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