Fuel evaporative emission control system of all-terrain vehicle

Abstract

The utility model discloses a fuel evaporative emission control system for an all-terrain vehicle. The fuel evaporative emission control system comprises a fuel system, a power system, an air inlet system, a carbon tank system and a circuit control system. The system can adsorb fuel steam escaping from the fuel tank, the fuel steam is guided into the carbon tank through the fuel return pipe to be adsorbed, and fuel is controlled by the carbon tank electromagnetic valve to enter a throttle valve body of a power system again. An engine control unit ECU controls opening and closing of a carbon tank electromagnetic valve according to state parameters such as whether an engine is started or not, the working duration of the engine, the temperature of engine cooling liquid, the rotating speed of the engine, the concentration of a mixer and the opening degree of a throttle valve, and fuel steam stored in a carbon tank is sucked into the engine through a vacuum oil pipe to participate in combustion. The system is reasonable in layout, simple in structure and reliable in function, meets the requirements of the whole vehicle emission regulation standard, and meanwhile reduces air pollution caused by fuel evaporation emission.

Description

Technical Field

[0001] The utility model relates to an all-terrain vehicle, more specifically, to a fuel evaporation emission control system for the all-terrain vehicle. Background Art

[0002] All-terrain vehicles have the characteristics of high maneuverability, strong passability in complex terrain, strong anti-rollover ability, stable, safe and reliable driving, and strong off-road capability. They can adapt to complex and changeable road conditions and can travel freely in harsh terrain conditions such as mountains, forest roads, wetlands, etc., meet multi-functional mission requirements, and are suitable for various application scenarios such as agricultural and animal husbandry production, emergency rescue, and entertainment, and are becoming more and more popular among people.

[0003] Currently, most all-terrain vehicles on the market use fuel-powered engines, making it difficult to balance power and emissions requirements. my country's ATVs are primarily exported to the European Union and the Americas. As countries around the world promote carbon neutrality, countries and regions around the world have enacted corresponding standards and regulations, and ATV emission standards are becoming increasingly stringent. To reduce environmental pollution and meet local emission limits, appropriate measures are needed to control ATV emissions. Utility Model Content

[0004] Based on this, it is necessary to provide an all-terrain vehicle fuel evaporation emission control system to address the above technical problems.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A fuel evaporative emission control system for an all-terrain vehicle, characterized in that the fuel evaporative emission control system for an all-terrain vehicle comprises a fuel system, a power system, an air intake system, a carbon canister system and a circuit control system.

[0007] The fuel system includes a fuel tank assembly, a fuel tank mounting strap, a fuel pump, a fuel pump sealing ring, a fuel pump pressure plate, an A-type linear quick connector, a B-type linear quick connector, an oil outlet pipe, an oil return pipe, a fuel filter, an A-type right-angle quick connector, a three-way quick connector, a B-type right-angle quick connector, an oil inlet pipe, an oil pump-dump valve return pipe, a dump valve, a dump valve fixing bracket, and a fuel filter mounting bracket. The fuel tank assembly is mounted on the vehicle body via the fuel tank mounting strap, the fuel pump is mounted on the fuel tank assembly via the fuel pump sealing ring and the fuel pump pressure plate, and the fuel filter is mounted on the vehicle body via the fuel filter mounting bracket.

[0008] The power system includes an engine assembly, an engine mounting buffer sleeve, a throttle valve body and an engine breather pipe. The bottom of the engine assembly is mounted on the vehicle body through the engine buffer sleeve. The engine assembly is connected to the intake system through the throttle valve body.

[0009] The air intake system includes an air filter connecting pipe, an air filter assembly, an air filter mounting clamp, an air filter intake connecting pipe, an air filter intake pipe and an air filter intake pipe cover. The air filter assembly is provided with a first air filter interface, a second air filter interface and a third air filter interface. The air filter assembly is arranged on the vehicle body through the air filter mounting clamp. The air filter assembly is provided with an air filter connecting pipe and an air filter intake connecting pipe at the positions of the first air filter interface and the second air filter interface respectively. The air filter assembly is connected to the throttle valve body of the power system through the air filter connecting pipe. The air filter assembly is connected to the air filter intake pipe through the air filter intake connecting pipe.

[0010] The carbon canister system includes a carbon canister, a carbon canister mounting bracket, a carbon canister connecting plate, a dump valve-carbon canister oil return pipe, a carbon canister-solenoid valve oil return pipe, a carbon canister solenoid valve, a carbon canister solenoid valve mounting bracket, a solenoid valve-valve body oil return pipe and a carbon canister vent pipe. The carbon canister is provided with a carbon canister connecting plate and is mounted on the vehicle body through the carbon canister mounting bracket. The carbon canister is provided with a first carbon canister interface, a second carbon canister interface and a third carbon canister interface. The carbon canister is provided with a dump valve-carbon canister oil return pipe, a carbon canister-solenoid valve oil return pipe and a carbon canister vent pipe at the first carbon canister interface, the second carbon canister interface and the third carbon canister interface respectively. The carbon canister is connected to the dump valve outlet on the dump valve of the fuel system through the dump valve-carbon canister oil return pipe.

[0011] The circuit control system includes a power supply, a relay, a voltage stabilizer and an engine control unit.

[0012] As a preferred embodiment of the present utility model, one end of the oil outlet pipe is connected to the A-type interface of the fuel pump through an A-type linear quick connector, and the other end is connected to the fuel filter inlet through the A-type right-angle quick connector. One end of the return oil pipe is connected to the B-type interface of the fuel pump through a B-type linear quick connector, and the other end of the return oil pipe is connected to the fuel filter outlet through a three-way quick connector. The B-type right-angle quick connector is arranged on the other interface of the three-way quick connector. One end of the oil inlet pipe is arranged on the B-type right-angle quick connector, and the other end of the oil inlet pipe is connected to the throttle valve body on the power system. One end of the oil pump-dump valve return pipe is arranged on the C-type interface of the fuel pump, and the other end of the oil pump-dump valve return pipe is arranged on the dump valve inlet.

[0013] As a preferred embodiment of the present invention, the engine assembly is connected to the fuel system and the carbon canister system respectively through the oil inlet pipe and the solenoid valve-valve body return oil pipe, and the engine assembly is connected to the air filter assembly of the intake system through the engine ventilation pipe at the third interface of the air filter.

[0014] As a preferred embodiment of the present utility model, an air filter intake pipe is provided with an air filter intake pipe cover, the air filter intake pipe is mounted on the vehicle body by bolts, and is connected to the air filter assembly at the second interface of the air filter through the air filter intake connecting pipe, the air filter connecting pipe is connected to the throttle valve body through a throat clamp, and the intake system is assembled and connected to the engine assembly through the throttle valve body.

[0015] As a preferred embodiment of the present utility model, the carbon canister solenoid valve is arranged on the vehicle body through a carbon canister solenoid valve mounting bracket, the carbon canister solenoid valve is connected to the carbon canister at the second interface position of the carbon canister through a carbon canister-solenoid valve return pipe, and is connected to the throttle valve body of the power system through a solenoid valve-valve body return pipe, the input end of the carbon canister system is connected to the fuel system through a dump valve-carbon canister return pipe, and the output end of the carbon canister system is connected to the power system through a carbon canister-solenoid valve return pipe, a carbon canister solenoid valve and a solenoid valve-valve body return pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This utility model provides a fuel evaporative emissions control system for all-terrain vehicles. This system absorbs fuel vapor escaping from the fuel tank and directs it into a carbon canister via a return line for adsorption. A carbon canister solenoid valve controls the re-entry of fuel into the powertrain's throttle body. The engine control unit (ECU) controls the opening and closing of the carbon canister solenoid valve based on parameters such as engine startup, engine operating hours, engine coolant temperature, engine speed, mixer concentration, and throttle opening, allowing fuel vapor stored in the carbon canister to be drawn into the engine through a vacuum oil line for combustion. This system boasts a rational layout, simple structure, and reliable functionality, meeting vehicle emission regulations and standards while reducing air pollution caused by fuel evaporative emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the solutions in the present invention, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of the connection structure of an existing all-terrain vehicle fuel evaporation system;

[0020] Figure 2 This is a schematic diagram of the connection structure of the fuel evaporative emission control system for an all-terrain vehicle of the present invention;

[0021] Figure 3 for Figure 2A further schematic diagram of the connection structure of the all-terrain vehicle fuel evaporative emission control system;

[0022] Figure 4 for Figure 2 Schematic diagram of further connection structure of the all-terrain vehicle fuel evaporative emission control system

[0023] Figure 5 for Figure 2 Schematic diagram of the assembly of the fuel evaporative emission control system for an all-terrain vehicle;

[0024] Figure 6 This is a control flow chart of the fuel evaporative emission control system for an all-terrain vehicle of the present utility model;

[0025] The markings in the figure are as follows:

[0026] 101-Fuel tank assembly;

[0027] 102-tank mounting strap;

[0028] 103 - fuel pump;

[0029] 1031-Fuel pump type A interface;

[0030] 1032-Fuel pump type B interface;

[0031] 1033-Fuel pump C-type interface

[0032] 104-Oil pump seal;

[0033] 105-Oil pump pressure plate;

[0034] 106-A type straight quick connector;

[0035] 107-B straight quick connector;

[0036] 108 - oil outlet pipe;

[0037] 109 - oil return pipe;

[0038] 110-Fuel filter;

[0039] 1101-Fuel filter inlet;

[0040] 1102-Fuel filter outlet;

[0041] 111-A type right angle quick connector;

[0042] 112-Tee type quick connector;

[0043] 113-B right angle quick connector;

[0044] 114 - oil inlet pipe;

[0045] 115 - Oil pump - dump valve return pipe;

[0046] 116 - dump valve;

[0047] 1161-dump valve inlet;

[0048] 1162-dump valve outlet;

[0049] 117-dump valve fixing bracket;

[0050] 118-Fuel filter mounting bracket;

[0051] 119-Hose clamp;

[0052] 200 - power system;

[0053] 201-Engine assembly;

[0054] 202-Engine mounting buffer sleeve;

[0055] 203-throttle valve body;

[0056] 204-engine breather pipe;

[0057] 300 - air intake system;

[0058] 301-air filter connecting pipe;

[0059] 302-air filter assembly;

[0060] 3021-Air filter first interface;

[0061] 3022-Air filter second interface;

[0062] 3023-Air filter third interface;

[0063] 303-Air filter mounting clamp

[0064] 304-air filter intake connecting pipe;

[0065] 305-air filter intake pipe;

[0066] 306-air filter intake pipe cover;

[0067] 400-Carbon canister system;

[0068] 401-Carbon canister;

[0069] 4011-Carbon canister first interface;

[0070] 4012-Carbon canister second interface;

[0071] 4013-Carbon canister third interface;

[0072] 402-Carbon canister mounting bracket;

[0073] 403-Carbon canister connecting plate;

[0074] 404-dump valve-carbon canister return pipe;

[0075] 405-Carbon canister-solenoid valve oil return pipe;

[0076] 406-carbon canister solenoid valve;

[0077] 407-carbon canister solenoid valve mounting bracket;

[0078] 408-Solenoid valve-valve body oil return pipe;

[0079] 409-Carbon canister vent pipe;

[0080] 410-clamp;

[0081] 500-Electrical control system;

[0082] 501 - power supply;

[0083] 502-relay;

[0084] 503 - voltage regulator;

[0085] 504 - Engine Control Unit (ECU);

[0086] 600 - vehicle body. DETAILED DESCRIPTION

[0087] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0088] The fuel evaporative emission control system of the all-terrain vehicle includes a fuel system 100, a power system 200, an air intake system 300, a carbon canister system 400, a circuit control system 500 and a vehicle body 600. Figure 1 The original system structure shown in the figure, this application adds a carbon canister system and a circuit control system, which participates in combustion through carbon canister adsorption and carbon canister solenoid valve opening and closing control to meet the fuel evaporation emission regulatory limit requirements of all-terrain vehicles, such as Figure 2 shown.

[0089] The fuel system 100 includes a fuel tank assembly 101, a fuel tank mounting strap 102, a fuel pump 103, a fuel pump seal 104, a fuel pump pressure plate 105, a type A straight quick connector 106, a type B straight quick connector 107, an oil outlet pipe 108, an oil return pipe 109, a fuel filter 110, a type A right-angle quick connector 111, a three-way quick connector 112, a type B right-angle quick connector 113, an oil inlet pipe 114, an oil pump-dump valve return pipe 115, a dump valve 116, a dump valve fixing bracket 117, a fuel filter mounting bracket 118, a hose clamp 119, etc. Figure 3 shown.

[0090] It should be noted that the fuel tank assembly 101 is mounted on the vehicle body 600 via the fuel tank mounting strap 102. The fuel pump 103 is mounted on the fuel tank assembly 101 via the fuel pump seal 104 and the fuel pump pressure plate 105. The fuel filter 110 is mounted on the vehicle body 600 via the fuel filter mounting bracket 118. One end of the fuel outlet pipe 108 is connected to the fuel pump's A-type port 1031 via an A-type linear quick connector 106, and the other end is connected to the fuel filter inlet 1101 via an A-type right-angle quick connector 111. One end of the fuel return pipe 109 is connected to the fuel pump's B-type port 1032 via a B-type linear quick connector 107, and the other end is connected to the fuel filter outlet 1102 via a T-type quick connector 112. A B-type right-angle quick connector 113 is mounted on the other end of the T-type quick connector 112. One end of the oil inlet pipe 114 is provided on the B-type right-angle quick connector 113 , and the other end is connected to the throttle valve body 302 on the power system 300 .

[0091] One end of the oil pump-dump valve oil return pipe 115 is arranged on the fuel pump C-type interface 1033, and the other end is arranged on the dump valve inlet 1161.

[0092] In addition, each oil pipe and each component of the fuel system 100 are fastened together by a hose clamp 119 .

[0093] The power system 200 includes an engine assembly 201 , an engine mounting buffer sleeve 202 , a throttle valve body 203 , an engine breather pipe 204 , and the like.

[0094] The bottom of the engine assembly 201 is mounted on the vehicle body 600 through the engine buffer sleeve 202, and is connected to the intake system 300 through the throttle valve body 203. It is connected to the fuel system 100 and the carbon canister system 400 through the oil inlet pipe 114 and the solenoid valve-valve body return oil pipe 407 respectively, and is connected to the air filter assembly 302 of the intake system 300 through the engine breather pipe 204 at the air filter third interface 3023. Figure 3 and Figure 5 shown.

[0095] The air intake system 300 includes an air filter connecting pipe 301, an air filter assembly 302, an air filter mounting clamp 303, an air filter intake connecting pipe 304, an air filter intake pipe 305, an air filter intake pipe cover 306, etc. The relationship between the system components and other components is as follows: Figure 3 and Figure 5 shown.

[0096] The air filter assembly 302 is provided with a first air filter interface 3021, a second air filter interface 3022, and a third air filter interface 3023, and is mounted on the vehicle body 600 via an air filter mounting clamp 303. An air filter connecting pipe 301 and an air filter intake connecting pipe 304 are respectively provided at the positions of the first air filter interface 3021 and the second air filter interface 3022 of the air filter assembly 302. The air filter assembly 302 is connected to the throttle valve body 203 of the power system 200 via the air filter connecting pipe 301, and is connected to the air filter intake pipe 305 via the air filter intake connecting pipe 304. The air filter intake pipe 305 is provided with an air filter intake pipe cover 306, which is mounted to the vehicle body 600 via bolts and connected to the air filter assembly 302 at the second air filter interface 3022 via the air filter intake connecting pipe 304. In addition, the air filter connecting pipe 301 is connected to the throttle valve body 203 through a throat clamp.

[0097] In addition, the intake system 300 is assembled and connected to the engine assembly 201 through the throttle valve body 203 .

[0098] The carbon canister system 400 includes a carbon canister 401, a carbon canister mounting bracket 402, a carbon canister connecting plate 403, a dump valve-carbon canister oil return pipe 404, a carbon canister-solenoid valve oil return pipe 405, a carbon canister solenoid valve 406, a carbon canister solenoid valve mounting bracket 407, a solenoid valve-valve body oil return pipe 408, a carbon canister vent pipe 409, a clamp 410, etc. Figure 4 shown.

[0099] It should be noted that the carbon canister 401 is equipped with a carbon canister connecting plate 403 and is mounted to the vehicle body 600 via a carbon canister mounting bracket 402. The carbon canister 401 is provided with a first carbon canister port 4011, a second carbon canister port 4012, and a third carbon canister port 4013. A dump valve-to-carbon canister oil return pipe 404, a carbon canister-to-solenoid valve oil return pipe 405, and a carbon canister vent pipe 409 are respectively provided at the locations of the first carbon canister port 4011, the second carbon canister port 4012, and the third carbon canister port 4013. The carbon canister 401 is connected to the dump valve outlet 1162 of the dump valve 116 of the fuel system 100 via the dump valve-to-carbon canister oil return pipe 404. The carbon canister solenoid valve 406 is mounted on the vehicle body 600 via a carbon canister solenoid valve mounting bracket 407. The carbon canister solenoid valve 406 is connected to the carbon canister 401 at the carbon canister second interface 4012 through the carbon canister-solenoid valve return pipe 405 , and is connected to the throttle valve body 203 of the power system 200 through the solenoid valve-valve body return pipe 408 .

[0100] The input of the carbon canister system 400 is connected to the fuel system 100 via a dump valve-to-carbon canister oil return line 404. The output of the carbon canister system 400 is connected to the power system 200 via a carbon canister-to-solenoid valve oil return line 405, a carbon canister solenoid valve 406, and a solenoid valve-to-valve body oil return line 408. The various oil lines of the carbon canister system 400 are connected to various components via clamps 410.

[0101] The circuit control system 500 includes a power supply 501, a relay 502, a voltage regulator 503, an engine control unit (ECU) 504, etc., and all are arranged on the vehicle body 600. Figure 5 shown.

[0102] The engine control unit (ECU) 504 controls the opening or closing of the carbon canister solenoid valve 406 according to the different operating conditions of the engine assembly 201, water temperature, mixer concentration, throttle opening and other parameters. The fuel vapor escaping from the fuel tank assembly 101 is adsorbed by the carbon canister 401 and then introduced into the engine for combustion, thereby reducing the direct emission of fuel vapor into the atmosphere and ensuring that the all-terrain vehicle meets the relevant regulatory requirements of the exporting country.

[0103] It should be noted that the amount of recovered fuel vapor entering the throttle body 203 must be controlled to prevent the normal mixture composition from being disrupted. This control process is achieved by the engine control unit (ECU) 504 by manipulating the opening and closing of the carbon canister solenoid valve 406 based on operating parameters such as the water temperature, mixer concentration, and throttle opening of the engine assembly 201. Figure 6 shown.

[0104] When the engine assembly 201 is shut down or idling, the ECU closes the carbon canister solenoid valve 406 , and the fuel vapor escaping from the fuel tank assembly 101 is absorbed by the activated carbon in the carbon canister 401 .

[0105] When the engine assembly 201 is running at a medium to high speed, the carbon canister solenoid valve 406 opens, and the fuel vapor stored in the carbon canister 401 is sucked into the engine assembly 201 through the vacuum hose. At this time, because the intake volume of the engine assembly 201 is large, the small amount of fuel vapor will not affect the composition of the mixture.

[0106] When the vehicle is parked for a long time, the carbon canister 401 may exceed its own adsorption capacity. At this time, the ECU will control the vehicle's engine assembly 201 to automatically start when no one is around and immediately open the carbon canister solenoid valve 406, so that the fuel vapor adsorbed by the carbon canister 401 can participate in combustion as soon as possible, and immediately shut down the engine assembly 201 after completion.

[0107] This system absorbs fuel vapor escaping from the fuel tank and directs it through a return line into a carbon canister for adsorption. The canister solenoid valve controls the re-entry of fuel into the powertrain's throttle body. The engine control unit (ECU) controls the opening and closing of the canister solenoid valve based on parameters such as engine startup, engine operating hours, engine coolant temperature, engine speed, mixer concentration, and throttle opening, allowing the fuel vapor stored in the canister to be drawn into the engine through a vacuum oil line for combustion. The system boasts a rational layout, simple structure, and reliable functionality, meeting vehicle emission regulations and standards while reducing air pollution caused by fuel evaporative emissions.

[0108] Obviously, the embodiments described above are only part of the embodiments of the present application, rather than all the embodiments. The drawings provide preferred embodiments of the present application, but do not limit the patent scope of the present application.

Claims

1. A fuel evaporative emission control system for an all-terrain vehicle, characterized in that: The all-terrain vehicle fuel evaporative emission control system comprises a fuel system (100), a power system (200), an air intake system (300), a carbon canister system (400) and a circuit control system (500). The fuel system (100) comprises a fuel tank assembly (101), a fuel tank mounting belt (102), a fuel pump (103), a fuel pump sealing ring (104), a fuel pump pressure plate (105), an A-type linear quick connector (106), a B-type linear quick connector (107), an oil outlet pipe (108), an oil return pipe (109), a fuel filter (110), an A-type right-angle quick connector (111), a three-way quick connector (112), a B-type right-angle quick connector (113), an oil inlet pipe (114), and a fuel pump. - a dump valve oil return pipe (115), a dump valve (116), a dump valve fixing bracket (117) and a fuel filter mounting bracket (118); the fuel tank assembly (101) is mounted on the vehicle body (600) via a fuel tank mounting belt (102); the fuel pump (103) is mounted on the fuel tank assembly (101) via a fuel pump sealing ring (104) and a fuel pump pressure plate (105); and the fuel filter (110) is mounted on the vehicle body (600) via a fuel filter mounting bracket (118). The power system (200) includes an engine assembly (201), an engine mounting buffer sleeve (202), a throttle valve body (203), and an engine ventilation pipe (204). The bottom of the engine assembly (201) is mounted on the vehicle body (600) through the engine buffer sleeve (202). The engine assembly (201) is connected to the intake system (300) through the throttle valve body (203). The air intake system (300) comprises an air filter connecting pipe (301), an air filter assembly (302), an air filter mounting clamp (303), an air filter intake connecting pipe (304), an air filter intake pipe (305) and an air filter intake pipe cover (306). The air filter assembly (302) is provided with an air filter first interface (3021), an air filter second interface (3022) and an air filter third interface (3023). The air filter assembly (302) is provided with an air filter mounting clamp (303). On the vehicle body (600), the air filter assembly (302) is provided with an air filter connecting pipe (301) and an air filter intake connecting pipe (304) at the positions of the first air filter interface (3021) and the second air filter interface (3022), respectively. The air filter assembly (302) is connected to the throttle valve body (203) of the power system (200) through the air filter connecting pipe (301), and the air filter assembly (302) is connected to the air filter intake pipe (305) through the air filter intake connecting pipe (304). The carbon canister system (400) comprises a carbon canister (401), a carbon canister mounting bracket (402), a carbon canister connecting plate (403), a dump valve-carbon canister oil return pipe (404), a carbon canister-solenoid valve oil return pipe (405), a carbon canister solenoid valve (406), a carbon canister solenoid valve mounting bracket (407), a solenoid valve-valve body oil return pipe (408) and a carbon canister vent pipe (409). The carbon canister (401) is provided with a carbon canister connecting plate (403) and is mounted on a vehicle body (600) via a carbon canister mounting bracket (402). The carbon canister (401) is provided with a carbon canister connecting plate (403). A first interface (4011), a second interface (4012) of a carbon canister and a third interface (4013) of a carbon canister are provided. The carbon canister (401) is provided with a dump valve-carbon canister oil return pipe (404), a carbon canister-solenoid valve oil return pipe (405) and a carbon canister vent pipe (409) at the positions of the first interface (4011), the second interface (4012) and the third interface (4013) of the carbon canister, respectively. The carbon canister (401) is connected to the dump valve outlet (1162) on the dump valve (116) of the fuel system (100) through the dump valve-carbon canister oil return pipe (404). The circuit control system (500) includes a power supply (501), a relay (502), a voltage stabilizer (503) and an engine control unit (504).

2. The all-terrain vehicle fuel evaporative emission control system according to claim 1, characterized in that: One end of the oil outlet pipe (108) is connected to the fuel pump A-type interface (1031) through the A-type linear quick connector (106), and the other end is connected to the fuel filter inlet (1101) through the A-type right-angle quick connector (111). One end of the oil return pipe (109) is connected to the fuel pump B-type interface (1032) through the B-type linear quick connector (107), and the other end of the oil return pipe (109) is connected to the fuel filter outlet (1102) through the three-way quick connector (112). A B-type right-angle quick connector (113) is arranged on the other interface of the three-way quick connector (112); one end of the oil inlet pipe (114) is arranged on the B-type right-angle quick connector (113); the other end of the oil inlet pipe (114) is connected to the throttle valve body (203) on the power system (200); one end of the oil pump-dump valve return pipe (115) is arranged on the fuel pump C-type interface (1033); and the other end of the oil pump-dump valve return pipe (115) is arranged on the dump valve inlet (1161).

3. The all-terrain vehicle fuel evaporative emission control system according to claim 1, characterized in that: The engine assembly (201) is connected to the fuel system (100) and the carbon canister system (400) respectively through the oil inlet pipe (114) and the solenoid valve-valve body oil return pipe (408). The engine assembly (201) is connected to the air filter assembly (302) of the intake system (300) through the engine ventilation pipe (204) at the air filter third interface (3023).

4. The all-terrain vehicle fuel evaporative emission control system according to claim 1, characterized in that: An air filter intake pipe cover (306) is provided on the air filter intake pipe (305). The air filter intake pipe (305) is mounted on the vehicle body (600) via bolts and is connected to the air filter assembly (302) at the air filter second interface (3022) via the air filter intake connecting pipe (304). The air filter connecting pipe (301) is connected to the throttle valve body (203) via a throat clamp. The air intake system (300) is assembled and connected to the engine assembly (201) via the throttle valve body (203).

5. The all-terrain vehicle fuel evaporative emission control system according to claim 1, characterized in that: The carbon canister solenoid valve (406) is arranged on the vehicle body (600) via a carbon canister solenoid valve mounting bracket (407). The carbon canister solenoid valve (406) is connected to the carbon canister (401) at the carbon canister second interface (4012) via a carbon canister-solenoid valve return pipe (405), and is connected to the throttle valve body (203) of the power system (200) via a solenoid valve-valve body return pipe (408). The input end of the carbon canister system (400) is connected to the fuel system (100) via a dump valve-carbon canister return pipe (404), and the output end of the carbon canister system (400) is connected to the power system (200) via a carbon canister-solenoid valve return pipe (405), a carbon canister solenoid valve (406), and a solenoid valve-valve body return pipe (408).

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