A dual high-pressure oil tank system with a switching valve

Abstract

This invention relates to a dual high-pressure fuel tank system with a switching valve. The system includes a first fuel tank, a second fuel tank, an ECU, a switching valve, a fuel tank isolation valve, a carbon canister, and an engine. Fuel tanks one and two are connected to the switching valve via exhaust pipes. The switching valve is connected to the fuel tank isolation valve via an exhaust pipe. The isolation valve is connected to the carbon canister via an exhaust pipe. The carbon canister is connected to the engine via a desorption pipe. Vapor pressure sensors in fuel tank one and two fuel tanks, the switching valve, and the fuel tank isolation valve are directly connected to the ECU via wiring harnesses. This technical solution is ingeniously designed and compact. It replaces two isolation valves with one isolation valve and one switching valve. The switching valve has a simple internal structure, is inexpensive, and has a low error rate, thus reducing the operating cost and error risk of the dual high-pressure fuel tank system.

Description

Technical Field

[0001] This invention relates to a dual high-pressure oil tank system, specifically a dual high-pressure oil tank system with a switching valve, belonging to the technical field of oil tank structural components. Background Technology

[0002] To achieve functions such as fuel tank sealing, pressure regulation, and safety pressure relief, and to ensure that the high-pressure fuel tank meets environmental regulations and guarantees driving safety, hybrid vehicles typically have an FTIV (Fuel Tank Isolation Valve) installed in the passage from the fuel tank to the carbon canister. Under normal conditions (non-refueling, non-abnormal pressure conditions), the FTIV remains closed, isolating the high-pressure fuel tank from the carbon canister pipeline, creating an independent, sealed space within the fuel tank. At this time, the vapor generated by fuel evaporation is trapped inside the fuel tank, preventing the carbon canister from continuously absorbing vapor and causing premature saturation, while also reducing direct emissions of fuel vapor into the atmosphere, meeting the China VI emission standards. When the ECU (Engine Control Unit) receives signals such as "refueling request," "fuel tank pressure over-limit," or "leakage diagnosis requirement," it immediately instructs the FTIV to open, connecting with the carbon canister or pressure relief pipeline to address the corresponding pressure or functional needs. Therefore, valves like the FTIV are essential components in every high-pressure fuel tank system.

[0003] Large hybrid vehicles typically employ two high-pressure fuel tanks to effectively extend their driving range. Currently, the common practice is to equip each high-pressure fuel tank with a separate FTIV (Fuel Transfer Valve). However, the internal structure of the FTIV valve is complex, making it expensive. A dual-high-pressure fuel tank system requires a separate isolation valve for each high-pressure fuel tank. These isolation valves also have complex internal structures, resulting in high costs and a high error rate, significantly increasing the operating cost and risk of failure for the dual-high-pressure fuel tank system. This invention offers a novel approach: achieving isolation between the two high-pressure fuel tanks using a single FTIV valve and a switching valve. Summary of the Invention

[0004] This invention addresses the technical problems existing in the prior art by providing a dual high-pressure oil tank system with a switching valve. This technical solution is ingeniously designed and has a compact structure. The solution uses one isolation valve and one switching valve instead of two isolation valves. The switching valve has a simple internal structure, is not only inexpensive but also has a low error rate, which can reduce the operating cost and error risk of the dual high-pressure oil tank system.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: a dual high-pressure fuel tank system with a switching valve, the system comprising a fuel tank I, a fuel tank II, an ECU, a switching valve, a fuel tank isolation valve, a carbon canister and an engine;

[0006] Fuel tank one and fuel tank two are connected to the switching valve through the exhaust pipe. The switching valve is connected to the fuel tank isolation valve through the exhaust pipe. The isolation valve is connected to the carbon canister through the exhaust pipe. The carbon canister is connected to the engine through the desorption pipe. These paths are used to transfer oil vapor.

[0007] The steam pressure sensor in fuel tank one, the steam pressure sensor in fuel tank two, the switching valve, and the fuel tank isolation valve are directly connected to the ECU via wiring harnesses. These paths are used to transmit electrical signals.

[0008] As an improvement of the present invention, the external structure of the switching valve includes three air pipe connectors and one wiring harness connector. The three air pipe connectors are connected to the oil tank isolation valve, the one air pipe connector is connected to the oil tank, the two air pipe connectors are connected to the oil tank, and the wiring harness connector is connected to the ECU.

[0009] As an improvement of the present invention, the internal structure of the switching valve includes an electromagnetic coil, a sealing component and a spring. When the electromagnetic coil is energized, it generates a magnetic field, and the iron core inside the coil is magnetized into an electromagnet. The sealing component, i.e. the valve core, includes a metal part and a rubber part. The metal part is attracted by the electromagnet, the rubber part seals the air pipe joint, and the spring connects to the sealing component and gives the sealing component a continuous pulling force.

[0010] A dual high-pressure oil tank system with a switching valve, the control process of which is as follows:

[0011] When the ECU command is "the solenoid coil is not energized", the sealing assembly is located at the position of air pipe joint three under the pull of the spring, and at the same time it seals joint three. At this time, air pipe joint two and air pipe joint one are connected, so the airflow flows between fuel tank one and FTIV.

[0012] When the ECU commands "energize the electromagnetic coil", the electromagnetic coil magnetizes the iron core inside into an electromagnet. Under the action of electromagnetic force, the sealing component overcomes the spring tension and moves to the position of air pipe connector two. At the same time, it also seals connector two. At this time, air pipe connector three and air pipe connector one are connected, so the airflow flows between fuel tank two and FTIV.

[0013] Compared with the prior art, the present invention has the following advantages: 1) The overall structure of the technical solution is compact and ingenious. The solution solves the pressure relief problem of dual high-pressure oil tanks and reduces costs and system error rate; 2) Since the price of the switching valve is only about half that of the isolation valve, the solution proposes for the first time to replace the two isolation valves in the prior art with one isolation valve and one switching valve, which greatly reduces the production cost of enterprises; 3) The switching valve has a compact overall structure, small size, and more flexible installation and arrangement, and has broad market prospects. Attached Figure Description

[0014] Figure 1 This is a framework diagram of an existing technology system.

[0015] Figure 2 This is a diagram of the overall system framework of the present invention.

[0016] Figure 3 This is a schematic diagram of the external structure of the switching valve;

[0017] Figure 4 This is a schematic diagram of the internal structure of the switching valve;

[0018] Figure 5 This is a schematic diagram of the control process when the electromagnetic coil is not energized;

[0019] Figure 6 This is a schematic diagram of the control process when the electromagnetic coil is energized. Detailed Implementation

[0020] To enhance understanding of the present invention, the embodiments will be described in detail below with reference to the accompanying drawings.

[0021] Example 1: Figure 2 A dual high-pressure fuel tank system with a switching valve is disclosed. The system includes a primary fuel tank, a secondary fuel tank, an ECU, a switching valve, a fuel tank isolation valve, a carbon canister, and an engine. The primary and secondary fuel tanks are connected to the switching valve via exhaust pipes. The switching valve is connected to the fuel tank isolation valve via an exhaust pipe. The isolation valve is connected to the carbon canister via an exhaust pipe. The carbon canister is connected to the engine via a desorption pipe. These paths are used to transmit fuel vapor. The vapor pressure sensors in the primary and secondary fuel tanks, the switching valve, and the fuel tank isolation valve are directly connected to the ECU via wiring harnesses. These paths are used to transmit electrical signals.

[0022] See Figure 3 The external structure of the switching valve includes three air pipe connectors and one wiring harness connector. Air pipe connector three connects to the fuel tank isolation valve, air pipe connector one connects to fuel tank one, air pipe connector two connects to fuel tank two, and the wiring harness connector connects to the ECU.

[0023] See Figure 4 The internal structure of the switching valve includes an electromagnetic coil, a sealing component, and a spring. When the electromagnetic coil is energized, it generates a magnetic field, and the iron core inside the coil is magnetized into an electromagnet. The sealing component, i.e., the valve core, includes metal parts and rubber parts. The metal parts are attracted by the electromagnet, and the rubber parts seal the air pipe joint. The spring connects to the sealing component and provides a continuous pulling force to the sealing component.

[0024] A dual high-pressure oil tank system with a switching valve, see [link / reference]. Figure 5 , Figure 6 The control process is as follows:

[0025] When the ECU command is "the solenoid coil is not energized", the sealing assembly is located at the position of air pipe joint three under the pull of the spring, and at the same time it seals joint three. At this time, air pipe joint two and air pipe joint one are connected, so the airflow flows between fuel tank one and FTIV.

[0026] When the ECU commands "energize the electromagnetic coil", the electromagnetic coil magnetizes the iron core inside into an electromagnet. Under the action of electromagnetic force, the sealing component overcomes the spring tension and moves to the position of air pipe connector two. At the same time, it also seals connector two. At this time, air pipe connector three and air pipe connector one are connected, so the airflow flows between fuel tank two and FTIV.

[0027] The present invention can also combine at least one of the technical features described in embodiments 2, 3, and 4 with embodiment 1 to form a new implementation.

[0028] It should be noted that the above embodiments are not intended to limit the scope of protection of the present invention. Equivalent transformations or substitutions made based on the above technical solutions all fall within the scope of protection of the claims of the present invention.

Claims

1. A dual high pressure tank system with a switching valve, characterized in that The system includes a fuel tank, a fuel tank, an ECU, a switching valve, a fuel tank isolation valve, a carbon canister, and an engine. in, Fuel tank one and fuel tank two are connected to a switching valve via exhaust pipes. The switching valve is connected to a fuel tank isolation valve via an exhaust pipe. The isolation valve is connected to a carbon canister via an exhaust pipe. The carbon canister is connected to the engine via a desorption pipe. The steam pressure sensor in fuel tank one, the steam pressure sensor in fuel tank two, the switching valve, and the fuel tank isolation valve are directly connected to the ECU via wiring harnesses.

2. The dual high-pressure oil tank system with switching valve according to claim 1, characterized in that, The external structure of the switching valve includes three air pipe connectors and one wiring harness connector. Air pipe connector three connects to the fuel tank isolation valve, air pipe connector one connects to fuel tank one, air pipe connector two connects to fuel tank two, and the wiring harness connector connects to the ECU.

3. The dual high-pressure tank system with a transfer valve according to claim 1, characterized in that, The internal structure of the switching valve includes an electromagnetic coil, a sealing assembly, and a spring. When the electromagnetic coil is energized, it generates a magnetic field, and the iron core inside the coil is magnetized into an electromagnet. The sealing assembly, i.e., the valve core, includes metal parts and rubber parts. The metal parts are attracted by the electromagnet, and the rubber parts seal the air pipe joint. The spring connects to the sealing assembly and provides a continuous pulling force to the sealing assembly.

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