A vehicle fuel evaporation leakage diagnostic device
By designing a vehicle fuel evaporation and leakage diagnosis device, using components such as locking valves and Venturi valves, the limitations of leakage diagnosis of fuel evaporation system in turbocharged engines are solved, and accurate leakage diagnosis of dual-fuel vehicles is achieved.
Patent Information
- Application Number
- CN202010974658.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-09-16
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2040-09-16
AI Technical Summary
The prior art cannot effectively diagnose the leakage of fuel evaporation systems in turbocharged engines, resulting in great limitations in diagnosis and cannot be applied to dual-fuel vehicles.
A vehicle fuel evaporation leakage diagnosis device is designed, including a gasoline tank and a methanol oil tank. The carbon canister is connected through a gasoline steam recovery pipe and a methanol steam recovery pipe. The first and second locking valves are used to control the air extraction process respectively, and the Venturi valve is used to control the The turbocharger is used in conjunction with the turbocharged engine to ensure accurate fuel evaporation and leakage diagnosis while the turbocharged engine is running.
The gasoline and methanol fuel are respectively pumped separately, ensuring the accuracy of leakage diagnosis and pumping quality, and are suitable for dual-fuel vehicles in turbocharged engines.
Smart Images
Figure CN111997795B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of automobile detection, and in particular to a vehicle fuel evaporation leakage diagnosis device. Background Art
[0002] The function of the fuel system is to supply a certain amount of clean, well-atomized gasoline to the engine according to the needs of the engine operating conditions, so as to mix with a certain amount of air to form a combustible mixture. At the same time, the fuel system also needs to store a considerable amount of fuel to ensure that the car has a considerable driving range. At present, the fuel used by cars is mainly gasoline and diesel. With the annual increase in the number of cars, the environmental pollution caused by automobile emissions and leakage can no longer be ignored; although methanol has many advantages as an alternative fuel for vehicles, it has a high ignition point and is difficult to start at low temperatures, and methanol filling stations are not popular; automobile manufacturers generally adopt the technical route of gasoline and methanol dual fuel to solve the above problems, switching to methanol fuel after gasoline low-temperature start, and using turbocharging technology to improve engine performance. With the tightening of emission regulations, relevant regulations stipulate that vehicles have a diagnostic detection function for fuel evaporation system leakage, prevent the leakage of the fuel evaporation system of the vehicle in use, and control the pollution of fuel vapor to the air; the leakage diagnosis of the fuel evaporation system in the existing technology is limited to single-fuel fuel vehicles, and it cannot be applied to vehicles powered by turbocharged engines, which has great limitations. Summary of the invention
[0003] The purpose of the present invention is to solve the defect of large leakage diagnosis limitation in the prior art and to propose a vehicle fuel evaporation leakage diagnosis device.
[0004] In order to achieve the above object, the present invention adopts the following technical solutions:
[0005] A vehicle fuel evaporation leakage diagnostic device is designed, comprising a gasoline tank, a gasoline vapor recovery pipe is fixedly installed at the outlet end of the gasoline tank, a first closing valve is fixedly installed on the gasoline vapor recovery pipe, a carbon canister is connected to the outlet end of the gasoline vapor recovery pipe, a methanol vapor recovery pipe is fixedly installed at the inlet end of the carbon canister, a second closing valve is fixedly installed on the methanol vapor recovery pipe, the inlet end of the second closing valve is connected to the methanol tank through the methanol vapor recovery pipe, the outlet end of the carbon canister is fixedly connected to an air introduction pipe, and a ventilation valve is fixedly installed at the inlet end of the air introduction pipe;
[0006] A gasoline rail assembly is installed at the inlet end of the gasoline tank, and an intake pipe assembly is fixedly connected to the outlet end of the gasoline rail assembly. A methanol rail assembly is fixedly installed at the outlet end of the methanol tank, and the outlet end of the methanol rail assembly is connected to the intake pipe assembly. The intake pipe assembly includes an intake manifold, an intake main pipe and a throttle valve. The intake manifold is fixedly connected to the intake main pipe, and the outlet end of the intake main pipe is connected to the throttle valve. The intake manifold is connected to the gasoline rail assembly and the methanol rail assembly respectively. When the fuel evaporation leakage diagnosis process is performed by pumping air, one of the first closing valve and the second closing valve remains closed.
[0007] Preferably, the outlet end of the throttle is fixedly connected to an air intercooler via a conduit, the outlet end of the air intercooler is fixedly connected to a turbocharger via a conduit, the outlet end of the turbocharger is fixedly installed with a boost pipe, and the outlet end of the boost pipe is fixedly installed with an air filter assembly.
[0008] Preferably, a first branch pipe is fixedly mounted on the throttle valve, an outlet end of the first branch pipe is connected to the boost pipe, and a Venturi valve is fixedly mounted on the first branch pipe.
[0009] Preferably, a steam desorption tube is fixedly installed on the inlet end of the venturi valve, the inlet end of the steam desorption tube is connected to the carbon canister, a gas circulation valve is fixedly installed on the outlet end of the steam desorption tube, and a carbon canister cleaning valve is fixedly installed on the inlet end of the steam desorption tube.
[0010] Preferably, a gasoline pump is placed inside the gasoline tank, a first filter is provided below the gasoline pump, the first filter is fixedly installed in the gasoline tank, and a gasoline level sensor is fixedly installed on the inner wall of the gasoline tank.
[0011] Preferably, a heating chamber and a storage chamber are provided inside the methanol fuel tank, a through air guide port is opened between the heating chamber and the storage chamber, a second filter is fixedly installed at the top of the heating chamber, a methanol liquid level sensor is fixedly installed at the top of the inner wall of the heating chamber, a methanol temperature sensor is fixedly installed at the bottom of the inner wall of the heating chamber, a heating wire is fixedly installed at the bottom of the inner side of the heating chamber, a plurality of condensation plates are fixedly installed inside the storage chamber, the condensation plates are evenly distributed in the storage chamber, and a corresponding methanol pump is fixedly installed inside the storage chamber.
[0012] Preferably, an oil filter is fixedly installed at the outlet ends of the gasoline tank and the methanol tank, and the oil filter comprises a shell, a gas washing layer is fixedly installed at the bottom end inside the shell, and a water absorption layer is fixedly installed on the top of the gas washing layer.
[0013] The vehicle fuel evaporation leakage diagnostic device proposed by the present invention has the following beneficial effects:
[0014] 1. When the fuel evaporation leak diagnosis process is being evacuated, keep one of the first locking valve and the second locking valve closed to achieve separate evaporation of gasoline fuel and methanol fuel in the fuel evaporation leak diagnosis system to ensure the accuracy of the leak diagnosis;
[0015] 2. The pipeline in the Venturi valve is only conducted when the turbocharger of the turbocharged engine is running, so that the first branch pipe and the second branch pipe can separately pump air to the fuel evaporation leakage diagnosis system to ensure the pumping quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 A schematic diagram of the structure of a vehicle fuel evaporation leakage diagnostic device according to an embodiment of the present invention Figure 1 ;
[0017] Figure 2 A schematic diagram of the structure of a vehicle fuel evaporation leakage diagnostic device according to an embodiment of the present invention Figure 2 ;
[0018] Figure 3 A schematic diagram of the internal structure of a gasoline tank of a vehicle fuel evaporation leakage diagnostic device according to an embodiment of the present invention;
[0019] Figure 4 A schematic diagram of the internal structure of a methanol fuel tank of a vehicle fuel evaporation leakage diagnostic device according to an embodiment of the present invention;
[0020] Figure 5 The present invention is a schematic structural diagram of an oil filter of a vehicle fuel evaporation leakage diagnostic device according to an embodiment of the present invention.
[0021] In the figure: gasoline tank 1, gasoline pump 111, first filter 112, gasoline level sensor 113, gasoline vapor recovery pipe 2, first locking valve 3, carbon canister 4, methanol vapor recovery pipe 5, second locking valve 6, methanol tank 7, heating chamber 71, storage chamber 72, methanol level sensor 73, second filter 74, methanol temperature sensor 75, heating wire 76, air guide port 77, condensation plate 78, methanol pump 79, oil filter 8, shell 81, suction Water layer 82, air washing layer 83, gasoline rail assembly 9, intake pipe assembly 10, intake manifold 101, intake main pipe 102, throttle valve 103, methanol rail assembly 11, air intercooler 12, turbocharger 13, boost pipe 14, air filter assembly 15, first branch pipe 16, venturi valve 17, steam desorption pipe 18, gas circulation valve 19, second branch pipe 20, carbon canister cleaning valve 21, air inlet pipe 22, ventilation valve 23. DETAILED DESCRIPTION
[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.
[0023] Reference Figure 1-2 A vehicle fuel evaporation leakage diagnostic device comprises a gasoline tank 1, a gasoline vapor recovery pipe 2 is fixedly installed at the outlet end of the gasoline tank 1, a first closing valve 3 is fixedly installed on the gasoline vapor recovery pipe 2, a carbon canister 4 is connected to the outlet end of the gasoline vapor recovery pipe 2, a methanol vapor recovery pipe 5 is fixedly installed at the inlet end of the carbon canister 4, a second closing valve 6 is fixedly installed on the methanol vapor recovery pipe 5, the inlet end of the second closing valve 6 is connected to a methanol tank 7 through the methanol vapor recovery pipe 5, an air introduction pipe 22 is fixedly connected to the outlet end of the carbon canister 4, and a ventilation valve 23 is fixedly installed at the inlet end of the air introduction pipe 22; when the fuel evaporation leakage diagnostic process is to be exhausted, one of the first closing valve 3 and the second closing valve 6 is kept closed, so as to realize the separate exhaust of gasoline fuel and methanol fuel in the fuel evaporation leakage diagnostic system and ensure the accuracy of leakage diagnosis.
[0024] A gasoline rail assembly 9 is installed at the inlet end of the gasoline tank 1, and an intake pipe assembly 10 is fixedly connected to the outlet end of the gasoline rail assembly 9. A methanol rail assembly 11 is fixedly installed at the outlet end of the methanol tank 7, and the outlet end of the methanol rail assembly 11 is connected to the intake pipe assembly 10. The intake pipe assembly 10 includes an intake manifold 101, an intake manifold 102 and a throttle valve 103. The intake manifold 101 is fixedly connected to the intake manifold 102. The intake manifold 103 is connected to the intake manifold 102. The outlet end of 02 is connected to the throttle valve 103, the intake manifold 101 is connected to the gasoline rail assembly 9 and the methanol rail assembly 11 respectively, the outlet end of the throttle valve 103 is fixedly connected to the air intercooler 12 through a conduit, the outlet end of the air intercooler 12 is fixedly connected to the turbocharger 13 through a conduit, the outlet end of the turbocharger 13 is fixedly installed with a boost pipe 14, and the outlet end of the boost pipe 14 is fixedly installed with an air filter assembly 15.
[0025] A first branch pipe 16 is fixedly installed on the throttle valve 103, and the outlet end of the first branch pipe 16 is connected to the boost pipe 14. A venturi valve 17 is fixedly installed on the first branch pipe 16, and a steam desorption pipe 18 is fixedly installed on the inlet end of the venturi valve 17, and the inlet end of the steam desorption pipe 18 is connected to the carbon canister 4. A gas circulation valve 19 is fixedly installed on the outlet end of the steam desorption pipe 18, and a second branch pipe 20 is fixedly installed on the inlet end of the gas circulation valve 19, and the inlet end of the second branch pipe 20 is connected to the throttle valve 103. A carbon canister cleaning valve 2 is fixedly installed on the inlet end of the steam desorption pipe 18.
[0026] Working principle: When the turbocharger 13 of the turbocharger engine is not running, the pressure in the intake manifold 101 of the turbocharger 13 is less than the atmospheric pressure, and the gasoline fuel leak diagnosis module / methanol fuel leak diagnosis module is evacuated through the second branch pipe 20 (the gasoline tank 1, gasoline vapor recovery pipe 2, carbon canister 4, and steam desorption pipe 18 constitute the gasoline fuel leak diagnosis module, and the methanol tank 7, methanol vapor recovery pipe 5, carbon canister 4, and steam desorption pipe 18 constitute the methanol fuel leak diagnosis module); when the turbocharger 13 of the turbocharger engine is running, the venturi valve 17 is turned on, and the first branch pipe 16 evacuates the gasoline fuel leak diagnosis module / methanol fuel leak diagnosis module. The first branch pipe 16 and the second branch pipe 20 can evacuate the fuel evaporation leak diagnosis system separately to ensure the quality of the evaporation.
[0027] The ventilation valve 23 is closed, and the carbon canister cleaning valve 21 is opened. When the first closing valve 3 is opened and the second closing valve 6 is closed, the engine working fuel is gasoline, and the gasoline fuel leakage diagnosis module composed of the gasoline tank 1, the gasoline vapor recovery pipe 2, the carbon canister 4, and the vapor desorption pipe 18 is evacuated; when the first closing valve 3 is closed and the second closing valve 6 is opened, the engine working fuel is methanol, and the methanol fuel leakage diagnosis module composed of the methanol tank 7, the methanol vapor recovery pipe 5, the carbon canister 4, and the vapor desorption pipe 18 is evacuated. It is possible to achieve separate evacuation of methanol and gasoline to ensure the accuracy of leakage diagnosis.
[0028] As a preferred example, Figure 3-4 As shown, a gasoline pump 111 is placed inside the gasoline tank 1, a first filter 112 is arranged below the gasoline pump 111, the first filter 112 is fixedly installed in the gasoline tank 1, and a gasoline level sensor 113 is fixedly installed on the inner wall of the gasoline tank 1; a heating chamber 71 and a storage chamber 72 are arranged inside the methanol tank 7, a through air guide port 77 is opened between the heating chamber 71 and the storage chamber 72, a second filter 74 is fixedly installed at the top of the heating chamber 71, a methanol level sensor 73 is fixedly installed at the top of the inner wall of the heating chamber 71, a methanol temperature sensor 75 is fixedly installed at the bottom of the inner wall of the heating chamber 71, a heating wire 76 is fixedly installed at the bottom inside the heating chamber 71, a plurality of condensation plates 78 are fixedly installed inside the storage chamber 72, the condensation plates 78 are evenly distributed in the storage chamber 72, and a corresponding methanol pump 79 is fixedly installed inside the storage chamber 72.
[0029] The gasoline or methanol is filtered through the first filter 112 and the second filter 72, so as to ensure the purity of the gasoline or methanol. In addition, the methanol mixture can be heated by the heating wire 76. Since the boiling point of methanol is lower than that of water, the heating temperature is obtained in real time through the methanol temperature sensor 75 during the heating process to ensure that the methanol is completely evaporated and the water is not evaporated. Then the methanol gas is introduced into the storage chamber 72 through the air inlet 77. The high-temperature methanol gas returns to a liquid state after contacting the condensation plate 78, and is finally discharged by the methanol pump 79. The whole process can effectively separate the water in the methanol mixture, greatly improve the purity of the methanol, and ensure safe use.
[0030] Preferably, the outlet ends of the gasoline tank 1 and the methanol tank 7 are both fixedly mounted with an oil filter 8, such as Figure 5 As shown, the oil filter 8 includes a housing 81, a gas washing layer 83 is fixedly installed at the bottom of the housing 81, and a water absorbing layer 82 is fixedly installed on the top of the gas washing layer 83. The oil filter 8 can filter gasoline or methanol, absorb the mixed water and gas inside the gasoline or methanol, thereby ensuring the cleanliness of the gasoline or methanol.
[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A vehicle fuel evaporation leakage diagnostic device, comprising a gasoline tank (1), wherein a gasoline vapor recovery pipe (2) is fixedly installed at the outlet end of the gasoline tank (1), It is characterized in that A first closing valve (3) is fixedly mounted on the gasoline vapor recovery pipe (2); the outlet end of the gasoline vapor recovery pipe (2) is connected to a carbon canister (4); the inlet end of the carbon canister (4) is fixedly mounted with a methanol vapor recovery pipe (5); a second closing valve (6) is fixedly mounted on the methanol vapor recovery pipe (5); the inlet end of the second closing valve (6) is connected to a methanol tank (7) via the methanol vapor recovery pipe (5); the outlet end of the carbon canister (4) is fixedly connected to an air introduction pipe (22); the inlet end of the air introduction pipe (22) is fixedly mounted with a ventilation valve (23); The inlet end of the gasoline tank (1) is equipped with a gasoline rail assembly (9), the outlet end of the gasoline rail assembly (9) is fixedly connected to an intake pipe assembly (10), the outlet end of the methanol tank (7) is fixedly equipped with a methanol rail assembly (11), the outlet end of the methanol rail assembly (11) is connected to the intake pipe assembly (10), the intake pipe assembly (10) comprises an intake manifold (101), an intake manifold (102) and a throttle valve (103), the intake manifold (101) is fixedly connected to the intake manifold (102), the outlet end of the intake manifold (102) is connected to the throttle valve (103), the intake manifold (101) is connected to the gasoline rail assembly (9) and the methanol rail assembly (11), respectively, wherein, when the fuel evaporation leakage diagnosis process is performed by pumping air, one of the first closing valve (3) and the second closing valve (6) remains closed; The outlet end of the throttle valve (103) is fixedly connected to an air intercooler (12) via a conduit, the outlet end of the air intercooler (12) is fixedly connected to a turbocharger (13) via a conduit, the outlet end of the turbocharger (13) is fixedly installed with a boost pipe (14), the outlet end of the boost pipe (14) is fixedly installed with an air filter assembly (15), the throttle valve (103) is fixedly installed with a first branch pipe (16), the outlet end of the first branch pipe (16) is connected to the boost pipe (14), and the first branch pipe (16) is fixedly installed with a Venturi valve (17); An oil filter (8) is fixedly installed at the outlet ends of the gasoline tank (1) and the methanol tank (7), and the oil filter (8) comprises a shell (81), a gas washing layer (83) is fixedly installed at the bottom end of the shell (81), and a water absorption layer (82) is fixedly installed at the top of the gas washing layer (83).
2. A vehicle fuel evaporation leakage diagnostic device according to claim 1, It is characterized in that A steam desorption pipe (18) is fixedly mounted on the inlet end of the venturi valve (17), the inlet end of the steam desorption pipe (18) is connected to the carbon canister (4), a gas circulation valve (19) is fixedly mounted on the outlet end of the steam desorption pipe (18), and a carbon canister cleaning valve (21) is fixedly mounted on the inlet end of the steam desorption pipe (18).
3. A vehicle fuel evaporation leakage diagnostic device according to claim 1, It is characterized in that A gasoline pump (111) is placed inside the gasoline tank (1), a first filter screen (112) is arranged below the gasoline pump (111), the first filter screen (112) is fixedly installed in the gasoline tank (1), and a gasoline liquid level sensor (113) is fixedly installed on the inner wall of the gasoline tank (1).
4. A vehicle fuel evaporation leakage diagnostic device according to claim 1, It is characterized in that The methanol tank (7) is provided with a heating chamber (71) and a storage chamber (72) inside, and a through air guide port (77) is provided between the heating chamber (71) and the storage chamber (72). A second filter screen (74) is fixedly installed at the top of the heating chamber (71), a methanol liquid level sensor (73) is fixedly installed at the top of the inner wall of the heating chamber (71), a methanol temperature sensor (75) is fixedly installed at the bottom of the inner wall of the heating chamber (71), a heating wire (76) is fixedly installed at the bottom of the inner side of the heating chamber (71), a plurality of condensation plates (78) are fixedly installed inside the storage chamber (72), and the condensation plates (78) are evenly distributed in the storage chamber (72). A corresponding methanol pump (79) is fixedly installed inside the storage chamber (72).