Novel double valve and switching method

Abstract

This invention discloses a novel double valve, comprising a double valve body, a motor assembly located at the bottom of the double valve body, two valve cores disposed within the double valve body, and two channels formed between each valve core, each valve core being driven to rotate by a corresponding motor assembly; it also includes a limit switch and a linkage element that rotates with the valve cores, and a push rod, one end of which is connected to the limit switch, and force is applied to the other end of the push rod to move the limit switch so that its stationary contact above it disengages from or contacts the moving contact on the linkage element, thereby realizing the connection or disconnection of the motor assembly. By improving the manual switching structure, the limit switch is moved by the push rod, making it convenient to use, simplifying operation, and providing a method for switching between high and low oil products.

Description

Technical Field

[0001] This invention relates to the field of oil switching device technology, specifically to a novel double valve and switching method. Background Technology

[0002] Traditional diesel vehicles typically use only one grade of fuel, such as 0# diesel in truck fuel tanks. However, when temperatures drop or in northern regions, 0# diesel often crystallizes, causing fuel line blockages, difficulty starting the engine, or even engine stalling during operation. While filling the tank with lower-grade fuels suitable for a wider temperature range, such as -10# diesel (4°C to -5°C) or -35# diesel (-14°C to -29°C), prevents crystallization, the lower-grade fuel's power and fuel economy are inferior to higher-grade diesel, thus increasing transportation costs. Therefore, diesel vehicles with dual-fuel systems have begun to be used and are gaining popularity.

[0003] To facilitate fuel switching in a dual-fuel system, a high-low fuel switching method is proposed in Patent Document 1, which uses a controller to automatically switch the channels of the fuel control valve and the heating control valve. However, the disadvantage is that if the control valve circuit is damaged, there is no manual switching method, which is inconvenient to use.

[0004] In response, Patent Document 2 proposes a dual valve that integrates the heating control valve and the oil control valve into one unit, uses a motor to control the rotation of the valve core, and adds a lever manual switching device, allowing for both manual and automatic switching methods. However, the drawback is that the manual operation of the lever is cumbersome and needs to be simplified.

[0005] Patent Document 1: Chinese Patent, Patent Title: A Fully Automatic Switching Method for High and Low Grade Oil Supply, Application No.: 201910508445.3.

[0006] Patent Document 2: Chinese Patent, Patent Name: Dual Valve, Application No.: 201910516761.5. Summary of the Invention

[0007] To address the aforementioned technical deficiencies, the present invention provides the following technical solution:

[0008] A novel double valve includes a double valve body, a motor assembly located at the bottom of the double valve body, two valve cores within the double valve body forming two channels with each valve core, and each valve core being driven to rotate by a corresponding motor assembly; it also includes a limit switch and a linkage element that rotates with the valve cores, with corresponding stationary contacts and elastic moving contacts on the limit switch and linkage element, respectively. When the stationary contact is in contact with the elastic moving contact, the motor assembly is in a closed circuit state; when the stationary contact is disengaged from the elastic moving contact, the motor assembly is in a closed circuit state; it also includes a push rod, one end of which is connected to the limit switch, and force is applied to the other end of the push rod to move the limit switch so that the stationary contact above it is disengaged from or in contact with the moving contact on the linkage element.

[0009] This new type of double valve improves the manual switching structure by using a push rod to move the limit switch so that its contact point is either disengaged from or makes contact with the contact point on the linkage element, thereby achieving the purpose of controlling the motor assembly to open or close. When the circuit is open, the valve core can be manually rotated to switch the channel port, which is convenient to use and simplifies operation.

[0010] Furthermore, it also includes a housing, inside which a motor assembly is installed. A limit switch is installed above the motor assembly. One end of the push rod is fixed to the limit switch, and the other end extends along the axial direction of the housing and protrudes from the bottom hole of the housing, which facilitates the installation of the push rod and the layout of other components.

[0011] Preferably, the top rod includes a longitudinal rod and a transverse rod. The longitudinal rod is arranged in parallel between the two motor assemblies inside the housing. One end of the longitudinal rod is connected to a limit switch, and the other end is connected to the transverse rod as a whole. The middle of the transverse rod is fixed to another longitudinal rod and extends from the bottom of the housing, which has good stability and is convenient for layout.

[0012] Furthermore, it also includes a spring, which is mounted on the push rod and one end of the spring is fixed to the housing wall. Applying force to the end of the push rod moves the limit switch, causing the stationary contact on the limit switch to disengage from the moving contact on the linkage element. When the external force is removed, the spring drives the push rod to reset, facilitating the automatic reset of the push rod.

[0013] Furthermore, it also includes a pressure cap. Two positions are provided on the bottom of the housing for fixing the pressure cap, a high position and a low position. When force is applied, the pressure cap moves from the high position to the low position, pushing the push rod to move. When force is applied, the pressure cap moves from the low position to the high position, and the push rod returns to its original position under the action of the spring. The pressure cap controls the position of the push rod, which facilitates continuous manual operation.

[0014] Furthermore, a protruding post is formed at the bottom of the housing, with an axial hole in the protruding post. The push rod extends from the hole, and the pressure cap is fitted onto the protruding post with threaded engagement, simplifying the connection structure between the pressure cap and the housing, making it simple and practical.

[0015] Furthermore, a connector is provided at the bottom of the valve core. The connector extends from the bottom of the double valve body, passes through the limit switch, and connects to the motor assembly. A linkage element is provided on the connector to facilitate docking with the motor assembly.

[0016] Furthermore, the top of the valve core extends from the top of the double valve body and is sealed. The upper peripheral wall of the valve core includes two orifices, both of which communicate with the valve core cavity. Correspondingly, two orifices are opened on the double valve body. The lower peripheral wall includes one orifice, which communicates with the valve core cavity. Correspondingly, an orifice is opened on the double valve body. Rotating the valve core aligns the two orifices on the upper part of the valve core with the two orifices on the double valve body, and the orifice on the lower part of the valve body is misaligned with the orifice on the double valve body, forming a first channel to supply oil to the engine or to allow coolant from the engine to flow into the oil tank. Rotating the valve core aligns one orifice on the upper part of the valve core with the orifice on the double valve body, and the other orifice is misaligned with the other orifice on the double valve body, and the orifice on the lower part of the valve core aligns with the orifice on the double valve body, forming a second channel to supply oil to the engine or to connect coolant from the engine to the external pipeline of the oil tank. The orifice positions are improved, allowing for side entry and exit, which facilitates layout and installation.

[0017] Furthermore, a groove is cut into the top surface of the valve core to facilitate rotation of the valve core with a screwdriver or similar tool.

[0018] Furthermore, the valve core includes upper and lower core bodies and a core cylinder. The upper and lower core bodies are respectively embedded in the cylinder cavities at the beginning and end of the core cylinder, and the upper core body extends from the top of the double valve body, which is convenient to form and can be quickly assembled.

[0019] The second aspect of this application provides a method for switching between high and low grade oils, including the following steps:

[0020] First, determine whether the double valve can operate automatically. If it can operate automatically, proceed to the process described in steps 1-9; if it cannot operate automatically, proceed to the process described in steps 10-18.

[0021] Step 1: Determine whether the parking action has been performed. If yes, proceed to Step 2; otherwise, continue supplying high-grade oil to the oil chamber.

[0022] Step 2: Delay engine shutdown, and the controller controls the dual valve to switch to supply fuel to the engine through the low-grade oil chamber;

[0023] Step 3: After the low-grade oil chamber is filled with oil to the engine and oil lines, turn off the engine;

[0024] Step 4: After starting the engine, the low-grade oil chamber supplies oil to the transmitter;

[0025] Step 5: After passing through the engine supplied with low-grade fuel, the coolant flows to the high-grade fuel chamber to be heated.

[0026] Step 6: The coolant is returned to the engine to cool it down;

[0027] Step 7: The temperature sensor in the high-grade oil chamber sends a temperature signal back to the controller;

[0028] Step 8: The controller compares the temperature signal to see if it reaches the temperature threshold. If it does, proceed to step 9; otherwise, continue to supply oil to the low-grade oil chamber.

[0029] Step 9: The controller controls the dual valve to switch the high-grade oil chamber to supply oil to the engine;

[0030] Step 10: Determine whether to perform a parking action. If yes, proceed to step 11; otherwise, continue supplying oil to the high-grade oil chamber.

[0031] Step 11: Delay shutting down the engine and manually control the dual valve to switch to supply fuel to the engine from the low-grade fuel chamber;

[0032] Step 12: After the low-grade oil chamber is filled with oil to the engine and oil lines, turn off the engine;

[0033] Step 13: After starting the engine, the low-grade oil chamber supplies oil to the transmitter;

[0034] Step 14: After passing through the engine supplied with low-grade fuel, the coolant flows to the high-grade fuel chamber to heat it.

[0035] Step 15: Coolant is returned to the engine to cool it.

[0036] Step 16: The temperature sensor in the high-grade oil chamber sends a temperature signal back to the controller;

[0037] Step 17: Compare whether the temperature signal has reached the temperature threshold. If it has, proceed to step 18; otherwise, continue to supply oil with the low-grade oil chamber.

[0038] Step 18: Manually control the dual valve to switch the high-grade oil chamber to supply oil to the engine, and manually control the dual valve to switch the coolant passage after a delay or at the same time.

[0039] This switching method integrates manual and automatic switching for ease of use.

[0040] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0041] 1. This double valve has an improved structure, using a push rod in conjunction with a limit switch to switch between on and off circuits, simplifying operation.

[0042] 2. This double valve features an improved valve core orifice structure, facilitating layout, installation, and operation.

[0043] 3. This method for switching between high and low grade oils integrates manual and automatic operation, making it more convenient to use. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 It is the flowchart in Patent Document 1;

[0046] Figure 2 It is the structure diagram of the double valve in Patent Document 2;

[0047] Figure 3 This is a structural diagram of a double valve;

[0048] Figure 4 This is a structural diagram of the connection between the valve core and the motor assembly of the double valve;

[0049] Figure 5 This is an exploded view of the valve core of the double valve.

[0050] Figure 6 This is a structural diagram of the double valve after the housing is installed;

[0051] Figure 7 yes Figure 6 Top view of the structure;

[0052] Figure 8 This is a diagram of the limit switch installation structure;

[0053] Figure 9 This is a diagram showing the fit between the pressure cap and the push rod in the low position.

[0054] Figure 10 This is a diagram showing the fit between the pressure cap and the push rod when in a high position.

[0055] The attached figures are labeled as follows:

[0056] 100. Double valve body; 101. Orifice; 102. Connector; 103. Valve core; 104. Panel; 200. Motor assembly; 201. Housing; 202. Protruding post; 300. Top rod; 301. Vertical rod; 302. Horizontal rod; 303. Spring; 400. Limit switch; 500. Linkage element; 600. Pressure cap; 700. Support column; 1031. Core cylinder; 1032. Upper core body; 1033. Lower core body. Detailed Implementation

[0057] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0058] Example 1

[0059] See Figure 3 , Figure 4 , Figure 5 In this embodiment, the double valve includes a double valve body 100, a motor assembly 200 located at the bottom of the double valve body, and two valve cores 103 installed inside the double valve body. The structure involves installing the valve cores in parallel cavities within the double valve body, forming two channels between the double valve body and each valve core. Each valve core is driven to rotate by a corresponding motor assembly. The valve also includes a limit switch 400 and a linkage element 500 that rotates with the valve cores. The limit switch and linkage element are respectively provided with cooperating stationary contacts and elastic moving contacts, as described in Patent Document 2. The stationary contact and the elastic moving contact are in contact, and the motor assembly is in a pass-through state. In this embodiment, the stationary contact is disengaged from the elastic moving contact, and the motor assembly is in an open-circuit state. Unlike Patent Document 2, this embodiment uses a push rod displacement limit switch 400. The first end of the push rod 300 is connected to the limit switch. Applying force to the tail end of the push rod moves the limit switch, causing the stationary contact above it to disengage from the moving contact on the linkage element, thus allowing direct manual rotation of the valve core. If the lever structure described in Patent Document 2 is used, the valve core can be rotated by directly moving the lever left and right to switch channels. When the push rod resets, the limit switch contacts the linkage element, allowing the motor assembly to directly control the rotation of the valve core via the vehicle's control system.

[0060] like Figure 3 , Figure 4 , Figure 5 As shown, in this embodiment, a connector 102 is installed at the bottom of the valve core to connect with the motor assembly. The connector extends from the bottom of the double valve body, passes through the limit switch and connects with the motor assembly. A linkage element is provided on the connector to facilitate connection with the motor assembly. There are no restrictions on the connector; common connectors on the market can be used for connection. The linkage element has a hole in the middle and is fixed on the connector. Of course, other methods such as welding and screw fixing can also be used.

[0061] See Figure 4 As shown, in this embodiment, to improve the stability of the push rod, the push rod 300 includes a longitudinal rod 301 and a transverse rod 302, and adopts a structure with two longitudinal rods arranged side by side in the middle of the motor assembly. The first ends of the two longitudinal rods are connected and fixed to the limit switch above the motor assembly. Preferably, the first ends of the two longitudinal rods pass through the plate of the limit switch and extend into the bottom hole of the double valve body, which makes the operation more stable. The tail ends of the two longitudinal rods are connected by the transverse rod, and the longitudinal rod is fixed in the middle of the transverse rod to facilitate the application of force.

[0062] To facilitate valve body installation, a housing 201 is added in this embodiment. Two motor assemblies are installed side-by-side within the housing cavity, and a limit switch is provided above the motor assemblies. Figure 8 As shown, the longitudinal rod in the top rod is fixed to the limit switch, and the other end extends along the axial direction of the housing and protrudes from the bottom hole of the housing.

[0063] To facilitate the reset of the push rod, such as Figure 9 , Figure 10 As shown, in this embodiment, a spring 303 is added. Its connection with the push rod can be selected by directly sleeved on the longitudinal rod in the middle of the crossbar. The two ends of the spring abut against the crossbar and the housing wall respectively, and the spring force assists in the reset. If the longitudinal rod is pressed, it pushes the static contact of the limit switch to contact the moving contact of the linkage element, the motor assembly is connected, and the vehicle control system controls the rotation of the valve core. At this time, the spring is in a stretched state. When the external force is removed, the push rod resets under the action of the spring force. Of course, the spring can also be fixed on the crossbar on both sides of the longitudinal rod.

[0064] To facilitate the positioning of the push rod, a pressure cap 600 is added in this embodiment. The housing wall has two positions for fixing the pressure cap, one at a high position and the other at a low position. Figure 9 , Figure 10 As shown, the pressure cap can be a common nut available on the market, with threads inside the cavity. The corresponding bottom end face of the housing is formed with a protrusion 202, and the outer circumference is also threaded. The nut is directly screwed onto the protrusion, and the longitudinal rod extends from the through hole in the middle of the protrusion. Tightening the nut to the low position presses down the longitudinal rod to push the limit switch plate, loosening the nut, and the push rod returns to its original position. Alternatively, the outer circumference of the nut is threaded, and the corresponding bottom end of the housing has a threaded hole. The longitudinal rod extends from the threaded hole, and the position of the nut is adjusted to adjust the position of the longitudinal rod. Of course, a concave-convex fit structure can also be used, such as multiple protrusions arranged inside the nut cavity, and the corresponding housing protrusion ball has a groove on its outer circumference. The concave-convex fit is used for positioning, and external force is applied to shift the position. This is a common structure, so it is not shown in the figure.

[0065] To facilitate valve body layout and installation, the valve body orifice structure is improved in this embodiment, such as... Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, the valve core is sealed at the top and extends from the top hole of the double valve body. In this embodiment, the upper peripheral wall of the valve core has two holes 101 spaced apart, both of which are connected to the valve core cavity. Correspondingly, two holes 101 are opened on the double valve body. The lower peripheral wall has one hole 101, which is connected to the valve core cavity. Correspondingly, an opening is opened on the double valve body.

[0066] Taking the oil chamber switching valve core as an example, one orifice on the upper part of the valve body is connected to the engine, and the other orifice is connected to the high-grade oil chamber. The orifice on the lower part of the valve body is connected to the low-grade oil chamber. In use, the valve core is rotated so that the two orifices on the upper part of the valve core correspond to the two orifices on the double valve body, and the orifice on the lower part of the valve body is misaligned with the orifice on the double valve body, forming the first high-grade oil supply channel to supply oil to the engine. The valve core is rotated so that one orifice on the upper part of the valve core corresponds to the orifice on the double valve body that connects to the engine, and the other orifice is misaligned with the other orifice on the double valve body. The orifice on the lower part of the valve core corresponds to the orifice on the double valve body, forming the second low-grade oil supply channel to supply oil to the engine. The orifice position is improved so that the oil enters and exits from the side.

[0067] Of course, the orifice of the coolant switching valve core is the same as that of the oil chamber switching valve core. It switches the high-temperature coolant from the engine to the pipeline in the high-grade oil chamber to heat the high-grade oil, and then returns it to the engine, or switches the high-temperature coolant from the engine to the cooling pipeline outside the high-grade oil chamber to dissipate heat and then returns it to the engine.

[0068] Of course, it is preferable to have a groove, such as a horizontal groove or a cross-shaped groove, cut on the top surface of the valve core to facilitate manual rotation of the valve core with a screwdriver or similar tool.

[0069] To facilitate the display of the oil type, a panel 200 can be fixed on the top of the valve body, with the top of the valve core extending from the panel hole. The panel displays text or numbers indicating which oil is supplied.

[0070] In this embodiment, the valve core adopts a split structure, including upper and lower core bodies and a core cylinder 1031. The upper and lower core bodies are respectively embedded in the end cavities of the core cylinder. The upper core body 1032, the lower core body 1033, and corresponding openings on the core cylinder are provided. Figure 5 As shown.

[0071] In addition, a support column 700 can be fixed at the bottom of the housing to facilitate the fixing of the valve body inside the vehicle body, such as... Figure 6 As shown.

[0072] The usage method is as follows:

[0073] First, determine whether the dual valve can operate automatically. For example, observe the oil switching on the panel; if it does not operate autonomously, or based on facts, such as not switching automatically last time.

[0074] When it can run automatically, proceed to steps 1-9 as follows:

[0075] Step 1: Determine whether the parking action has been performed. If yes, proceed to Step 2; otherwise, continue supplying high-grade oil to the oil chamber.

[0076] Step 2: Delay engine shutdown, and the controller controls the dual valve to switch to supply fuel to the engine through the low-grade oil chamber;

[0077] Step 3: After the low-grade oil chamber is filled with oil to the engine and oil lines, turn off the engine;

[0078] Step 4: After starting the engine, the low-grade oil chamber supplies oil to the transmitter;

[0079] Step 5: After passing through the engine supplied with low-grade fuel, the coolant flows to the high-grade fuel chamber to be heated.

[0080] Step 6: The coolant is returned to the engine to cool it down;

[0081] Step 7: The temperature sensor in the high-grade oil chamber sends a temperature signal back to the controller;

[0082] Step 8: The controller compares the temperature signal to see if it reaches the temperature threshold. If it does, proceed to step 9; otherwise, continue to supply oil to the low-grade oil chamber.

[0083] Step 9: The controller controls the dual valve to switch the high-grade oil chamber to supply oil to the engine.

[0084] If the process cannot run automatically, proceed to steps 10-18 as follows:

[0085] Step 10: Manually decide whether to perform the parking action. If yes, proceed to step 11; otherwise, continue supplying oil to the high-grade oil chamber.

[0086] Step 11: Delay shutting off the engine, manually tighten the pressure cap to the high position, or directly loosen the pressure cap to allow the spring to pull the push rod and disengage the limit switch from the linkage element. Use a screwdriver to control the valve core to rotate and switch to supply oil to the engine through the low-grade oil chamber.

[0087] Step 12: After the low-grade oil chamber is filled with oil to the engine and oil lines, turn off the engine;

[0088] Step 13: After starting the engine, the low-grade oil chamber supplies oil to the transmitter;

[0089] Step 14: Manually adjust the valve core for regulating the coolant. After passing through the engine supplied with low-grade fuel, the coolant flows to the high-grade fuel chamber to heat it.

[0090] Step 15: Coolant is returned to the engine to cool it.

[0091] Step 16: The temperature sensor in the high-grade oil chamber sends a temperature signal back to the controller;

[0092] Step 17: Manually compare the temperature signal to see if it reaches the temperature threshold. If it does, proceed to step 18; otherwise, continue supplying oil to the low-grade oil chamber.

[0093] Step 18: Manually control the dual valve to switch the high-grade oil chamber to supply oil to the engine, and switch the coolant to the external cooling pipe of the oil chamber.

[0094] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A novel double valve, comprising a double valve body, a motor assembly located at the bottom of the double valve body, two valve cores disposed within the double valve body, forming two channels with each valve core, each valve core being driven to rotate by a corresponding motor assembly; further comprising a limit switch and a linkage element rotating with the valve cores, the limit switch and the linkage element respectively being provided with cooperating stationary contacts and elastic moving contacts, the stationary contact being in contact with the elastic moving contact when the motor assembly is in a closed circuit state, and the stationary contact being disengaged from the elastic moving contact when the motor assembly is in a closed circuit state, characterized in that: It also includes a push rod, one end of which is connected to a limit switch. Applying force to the other end of the push rod moves the limit switch so that the stationary contact above it is disengaged from or in contact with the moving contact on the linkage element. It also includes a housing, inside which a motor assembly is installed, and above the motor assembly a limit switch is installed. One end of the push rod is fixed to the limit switch, and the other end extends along the axial direction of the housing and protrudes from the hole at the bottom of the housing. The top rod includes a longitudinal rod and a transverse rod. The longitudinal rod is arranged in parallel between the two motor assemblies inside the housing. One end of the longitudinal rod is connected to the limit switch, and the other end is connected to the transverse rod as a whole. The middle of the transverse rod is fixed to another longitudinal rod and extends from the bottom of the housing. It also includes a spring, which is set on the push rod and one end of the spring is fixed to the housing wall. Force is applied to the end of the push rod to move the limit switch, so that the stationary contact on the limit switch is separated from the moving contact on the linkage element. When the external force is removed, the spring drives the push rod to reset. A connector is provided at the bottom of the valve core. The connector extends from the bottom of the double valve body, passes through the limit switch, and connects to the motor assembly. A linkage element is provided on the connector.

2. The novel double valve as described in claim 1, characterized in that: It also includes a pressure cap, with two positions on the bottom of the housing for fixing the pressure cap, a high position and a low position. When force is applied, the pressure cap moves from the high position to the low position, pushing the push rod to move. When force is applied, the pressure cap moves from the low position to the high position, and the push rod returns to its original position under the action of the spring.

3. The novel double valve as described in claim 2, characterized in that: The bottom of the housing is formed with a protruding post, which has an axial hole. The push rod extends out of the hole, and the pressure cap is fitted onto the protruding post with threaded engagement.

4. The novel double valve as described in any one of claims 1-3, characterized in that: The top of the valve core extends from the top of the double valve body and is sealed. The upper peripheral wall of the valve core includes two orifices, both of which communicate with the valve core cavity. Correspondingly, two orifices are opened on the double valve body. The lower peripheral wall includes one orifice, which communicates with the valve core cavity. Correspondingly, an orifice is opened on the double valve body. Rotating the valve core aligns the two orifices on the upper part of the valve core with the two orifices on the double valve body, and the orifice on the lower part of the valve body is misaligned with the orifice on the double valve body, forming a first channel to supply oil to the engine or to allow coolant from the engine to flow into the oil tank. Rotating the valve core again aligns one orifice on the upper part of the valve core with the orifice on the double valve body, and the other orifice is misaligned with the other orifice on the double valve body, and the orifice on the lower part of the valve core aligns with the orifice on the double valve body, forming a second channel to supply oil to the engine or to connect coolant from the engine to the external pipeline of the oil tank.

5. The novel double valve as described in claim 4, characterized in that: The top surface of the valve core is grooved.

6. The novel double valve as described in claim 4, characterized in that: The valve core includes upper and lower core bodies and a core cylinder. The upper and lower core bodies are respectively embedded in the cylinder cavities at the beginning and end of the core cylinder, and the upper core body extends out from the top of the double valve body.

7. A method for switching between high and low grade oils using the novel dual valve as described in claim 1, characterized in that: Includes the following steps: First, determine whether the double valve can operate automatically. If it can operate automatically, proceed to steps 1-9; if it cannot operate automatically, proceed to steps 10-18. Step 1: Determine whether the parking action has been performed. If yes, proceed to Step 2; otherwise, continue supplying high-grade oil to the oil chamber. Step 2: Delay engine shutdown, and the controller controls the dual valve to switch to supply fuel to the engine through the low-grade oil chamber; Step 3: After the low-grade oil chamber is filled with oil to the engine and oil lines, turn off the engine; Step 4: After starting the engine, the low-grade oil chamber supplies oil to the transmitter; Step 5: After passing through the engine supplied with low-grade fuel, the coolant flows to the high-grade fuel chamber to be heated. Step 6: The coolant is returned to the engine to cool it down; Step 7: The temperature sensor in the high-grade oil chamber sends a temperature signal back to the controller; Step 8: The controller compares the temperature signal to see if it reaches the temperature threshold. If it does, proceed to step 9; otherwise, continue to supply oil to the low-grade oil chamber. Step 9: The controller controls the dual valve to switch the high-grade oil chamber to supply oil to the engine; Step 10: Determine whether to perform a parking action. If yes, proceed to step 11; otherwise, continue supplying oil to the high-grade oil chamber. Step 11: Delay shutting down the engine and manually control the dual valve to switch to supply fuel to the engine from the low-grade fuel chamber; Step 12: After the low-grade oil chamber is filled with oil to the engine and oil lines, turn off the engine; Step 13: After starting the engine, the low-grade oil chamber supplies oil to the transmitter; Step 14: After passing through the engine supplied with low-grade fuel, the coolant flows to the high-grade fuel chamber to heat it. Step 15: Coolant is returned to the engine to cool it. Step 16: The temperature sensor in the high-grade oil chamber sends a temperature signal back to the controller; Step 17: Compare whether the temperature signal has reached the temperature threshold. If it has, proceed to step 18; otherwise, continue to supply oil with the low-grade oil chamber. Step 18: Manually control the dual valve to switch the high-grade oil chamber to supply oil to the engine, and manually control the dual valve to switch the coolant passage after a delay or at the same time.

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