Evaporative emissions control for a vehicle
A fuel system comprising a fuel tank, a mixing volume configured to mix fuel vapor and air, the mixing volume comprising an outlet configured to be fluidly coupled to an engine, and a fuel vapor line configured to fluidly couple the fuel tank to the mixing volume.
1. A vehicle comprising:
a frame;
a plurality of ground engaging members supporting the frame;
a powertrain assembly operably coupled to the ground engaging members, the powertrain assembly comprising:
an engine having a first cylinder and a second cylinder; and
at least one throttle body fluidly coupled to the first cylinder and the second cylinder;
an intake assembly coupled to the engine, the intake assembly comprising a first intake port and a second intake port;
an exhaust assembly coupled to the engine; and
a fuel system fluidly coupled to the engine, the fuel system including;
a first throttle body fluidly coupled to the first intake port,
a second throttle body fluidly coupled to the second intake port,
a mixing volume fluidly coupled to each of the first throttle body and the second throttle body,
a fuel tank, and the mixing volume and the fuel tank each fluidly coupled to each of the first throttle body and the second throttle body,
an evaporative canister fluidly coupled intermediate the fuel tank and the mixing volume
a first check valve operably coupled to the first cylinder and positioned intermediate the mixing volume and the first throttle body,
a second check valve operably coupled to the second cylinder and positioned intermediate the mixing volume and the second throttle body, and
a fuel vapor line fluidly coupling the fuel tank to the first check valve and the second check valve.
2. The vehicle of claim 1 , wherein the first and second check valves are positioned within approximately 150 millimeters of the first and second cylinders.
3. The vehicle of claim 1 , wherein the fuel system further includes a purge valve, the purge valve being positioned downstream of the fuel tank and upstream of the mixing volume and the mixing volume being positioned downstream of the fuel tank and the purge valve and upstream of the first and second check valves.
4. The vehicle of claim 1 , wherein the first and second check valves inhibit fluid communication between the first cylinder and the second cylinder.
5. The vehicle of claim 1 , further comprising a seat supported by the frame, the seat configured to support an operator, and each of the first check valve and the second check valve are positioned rearward of the seat.
6. The vehicle of claim 1 , wherein the mixing volume is positioned vertically higher than the first intake port.
7. The vehicle of claim 1 , wherein the fuel tank is positioned longitudinally forward of the mixing volume.
8. The vehicle of claim 1 , further comprising a purge valve positioned intermediate the evaporative canister and the mixing volume.
9. The vehicle of claim 1 , wherein the first check valve is positioned less than 150 millimeters from the first intake port.
10. The vehicle of claim 9 , wherein the first check valve is positioned between 25-75 millimeters from the first intake port.
11. A vehicle comprising:
a frame;
a plurality of ground engaging members supporting the frame;
an operator area including at least one seat supported by the frame;
a powertrain assembly operably coupled to the ground engaging members, the powertrain assembly comprising an engine positioned generally rearward of the at least one seat, and an intake assembly coupled to the engine, the intake assembly comprising a first intake port and a second intake port; and
a fuel system fluidly coupled to the engine, the fuel system including:
a fuel tank positioned below the at least one seat and fluidly coupled to the intake assembly through a fuel delivery line,
a mixing volume fluidly coupled to the engine,
a fuel vapor line fluidly coupling the fuel tank to the mixing volume,
an evaporation canister positioned fluidly along the fuel vapor line,
a first check valve positioned fluidly intermediate the evaporation canister and the first intake port, and
a second check valve positioned fluidly intermediate the evaporation canister and the second intake port,
wherein mixing volume, the first check valve, and the second check valve are positioned rearward of the at least one seat.
12. The vehicle of claim 11 , wherein the evaporation canister is positioned under the fuel tank.
13. The vehicle of claim 11 , wherein the at least one seat includes a first seat and a second seat in side-by-side arrangement with the first seat, and the evaporation canister is positioned under the second seat and the fuel tank is positioned under the first seat.
14. The vehicle of claim 11 , wherein the mixing volume is positioned vertically higher than an uppermost surface of the engine.
15. The vehicle of claim 11 , wherein the mixing volume comprises an inlet fluidly coupled to the evaporative canister, a first outlet fluidly coupled to the first intake port and a second outlet fluidly coupled to the second intake port.
16. The vehicle of claim 15 , wherein the first check valve is positioned intermediate the mixing volume and the first intake port, and the second check valve is positioned intermediate the mixing volume and the second intake port.
17. The vehicle of claim 11 , wherein the first check valve is positioned less than 150 millimeters from the first intake port.
18. The vehicle of claim 17 , wherein the first check valve is positioned between 25-75 millimeters from the first intake port.
19. The vehicle of claim 11 , wherein at least a portion of the first check valve overlaps, in a vertical direction, at least a portion of the first intake port.
20. The vehicle of claim 11 , wherein a portion of the first check valve is positioned within a vertical envelope of the engine.
21. The vehicle of claim 11 , further comprising a mixing volume positioned intermediately the evaporative canister and the first check valve, and the mixing volume is positioned vertically higher than the fuel tank.