In a fuel injection system, a fuel tank is disposed below an electronically controlled fuel injection apparatus. A fuel reservoir chamber for supplying fuel from the fuel tank is disposed above the electronically controlled fuel injection apparatus, and the fuel stored in the fuel reservoir chamber
In a fuel injection system, a fuel tank is disposed below an electronically controlled fuel injection apparatus. A fuel reservoir chamber for supplying fuel from the fuel tank is disposed above the electronically controlled fuel injection apparatus, and the fuel stored in the fuel reservoir chamber is supplied to the electronically controlled fuel injection apparatus via a fuel supply passage. The fuel reservoir chamber and the fuel tank are connected by a first fuel return passage through which vapor is ejected and fuel in the fuel reservoir chamber overflows. A second fuel return passage for returning surplus fuel from the electronically controlled fuel injection apparatus is connected to either of the fuel reservoir chamber and the first fuel return passage at the position above the connecting position at which the fuel reservoir chamber connects with the first fuel return passage.
대표청구항▼
What is claimed is: 1. A fuel injection system, comprising: a fuel tank; an electronically controlled fuel injection apparatus which is located above said fuel tank; a fuel reservoir chamber which is located above said electronically controlled fuel injection apparatus; a fuel introduction passage
What is claimed is: 1. A fuel injection system, comprising: a fuel tank; an electronically controlled fuel injection apparatus which is located above said fuel tank; a fuel reservoir chamber which is located above said electronically controlled fuel injection apparatus; a fuel introduction passage which connects said fuel tank and said fuel reservoir chamber; a fuel pump which introduces fuel from said fuel tank to said fuel reservoir chamber via said fuel introduction passage; a first fuel return passage which connects said fuel reservoir chamber and said fuel tank, and returns fuel overflowing from said fuel reservoir chamber and vapor to said fuel tank, said first fuel return passage connecting with said fuel reservoir chamber at a first connecting position; a fuel supply passage which connects said fuel reservoir chamber and said electronically controlled fuel injection apparatus; a filter arranged upstream of said electronically controlled fuel injection apparatus in said fuel supply passage for eliminating vapor from fuel passing through said fuel supply passage prior to entry of the fuel into said electronically controlled fuel injection apparatus; and a second fuel return passage connecting said electronically controlled fuel injection apparatus with said fuel reservoir chamber, said second fuel return passage having a portion disposed higher than said first connecting position. 2. The fuel injection system according to claim 1, wherein said filter has an inner space formed therein; a branch passage branches from some midpoint of said second fuel return passage at a branching position disposed below said first connecting position ; and said branch passage and said fuel supply passage are connected with said inner space of said filter, and said branch passage is horizontal or declined from said branching position at which said branch passage connects towards a second connecting position with said inner space of said filter. 3. The fuel injection system according to claim 2, wherein in a route from said branching position through said branch passage and said inner space of said filter to third connecting position at which said inner space connects with said fuel supply passage on a downstream side of said filter, said branching position is the highest position, and said third connecting position is the lowest position; and said route from said branching position to said third connecting position does not have a portion that declines in a direction from said branching position toward said third connecting position. 4. The fuel injection system according to claim 2, wherein an inner diameter of said second fuel return passage above said branching position is equal to or larger than 12 millimeters. 5. The fuel injection system according to claim 4, wherein an inner diameter of said second fuel return passage below said branching position is smaller than the inner diameter of said second fuel return passage above said branching position. 6. The fuel injection system according to claim 1, wherein a filter which does not allow foreign particles to pass through but allows vapor to pass through is disposed at said second fuel return passage above said first connecting position. 7. A fuel injection system, comprising: a fuel tank; an electronically controlled fuel injection apparatus which is located above said fuel tank; a fuel reservoir chamber which is located above said electronically controlled fuel injection apparatus; a fuel introduction passage which connects said fuel tank and said fuel reservoir chamber; a fuel pump which introduces fuel from said fuel tank to said fuel reservoir chamber via said fuel introduction passage; a first fuel return passage which connects said fuel reservoir chamber and said fuel tank, and returns fuel overflowing from said fuel reservoir chamber and vapor to said fuel tank, said first fuel return passage connecting with said fuel reservoir chamber at a first connecting position; a fuel supply passage which connects said fuel reservoir chamber and said electronically controlled fuel injection apparatus; a filter arranged upstream of said electronically controlled fuel injection apparatus in said fuel supply passage for eliminating vapor from fuel passing through said fuel supply passage prior to entry of the fuel into said electronically controlled fuel injection apparatus; and a second fuel return passage connecting said electronically controlled fuel injection apparatus with said first fuel return passage, said second fuel return passage having a portion disposed higher than said first connecting position. 8. The fuel injection system according to claim 7, wherein said filter has an inner space formed therein; a branch passage branches from some midpoint of said second fuel return passage at a branching position disposed below said first connecting position ; and said branch passage and said fuel supply passage are connected with said inner space of said filter, and said branch passage is horizontal or declined from said branching position at which said branch passage connects towards a second connecting position with said inner space of said filter. 9. The fuel injection system according to claim 8, wherein in a route from said branching position through said branch passage and said inner space of said filter to third connecting position at which said inner space connects with said fuel supply passage on a downstream side of said filter, said branching position is the highest position, and said third connecting position is the lowest position; and said route from said branching position to said third connecting position does not have a portion that declines in a direction from said branching position toward said third connecting position. 10. The fuel injection system according to claim 8, wherein an inner diameter of said second fuel return passage above said branching position is equal to or larger than 12 millimeters. 11. The fuel injection system according to claim 10, wherein an inner diameter of said second fuel return passage below said branching position is smaller than the inner diameter of said second fuel return passage above said branching position. 12. The fuel injection system according to claim 7, wherein a filter which does not allow foreign particles to pass through but allows vapor to pass through is disposed at said second fuel return passage above said first connecting position. 13. A fuel injection system, comprising: a fuel tank; an electronically controlled fuel injection apparatus which is located above said fuel tank; a fuel reservoir chamber which is located above said electronically controlled fuel injection apparatus; a fuel introduction passage which connects said fuel tank and said fuel reservoir chamber; a fuel pump which introduces fuel from said fuel tank to said fuel reservoir chamber via said fuel introduction passage; a first fuel return passage which connects said fuel reservoir chamber and said fuel tank, and returns fuel overflowing from said fuel reservoir chamber and vapor to said fuel tank, said first fuel return passage connecting with said fuel reservoir chamber at a first connecting position; a fuel supply passage which connects said fuel reservoir chamber and said electronically controlled fuel injection apparatus; a filter arranged upstream of said electronically controlled fuel injection apparatus in said fuel reservoir chamber for eliminating vapor from fuel passing through said fuel supply passage prior to entry of the fuel into said electronically controlled fuel injection apparatus; and a second fuel return passage connecting said electronically controlled fuel injection apparatus with said fuel reservoir chamber, said second fuel return passage having a portion disposed higher than said first connecting position. 14. The fuel injection system according to claim 13, wherein said fuel supply passage projects above a fuel level location in said fuel reservoir chamber, said fuel supply passage includes an opening that opens into said fuel reservoir chamber above the fuel level location, said fuel supply passage includes a fuel inlet opening which opens into a said fuel reservoir chamber below the fuel level location, and said fuel inlet opening is covered by said filter. 15. The fuel injection system according to claim 14, wherein a filter which does not allow foreign particles to pass through but allows vapor to pass through is attached to said opening of said fuel supply passage that opens into said fuel reservoir chamber above the fuel level location. 16. The fuel injection system according to claim 13, wherein a filter which does not allow foreign particles to pass through but allows vapor to pass through is disposed at said second fuel return passage above said first connecting position. 17. A fuel injection system, comprising: a fuel tank; an electronically controlled fuel injection apparatus which is located above said fuel tank; a fuel reservoir chamber which is located above said electronically controlled fuel injection apparatus; a fuel introduction passage which connects said fuel tank and said fuel reservoir chamber; a fuel pump which introduces fuel from said fuel tank to said fuel reservoir chamber via said fuel introduction passage; a first fuel return passage which connects said fuel reservoir chamber and said fuel tank, and returns fuel overflowing from said fuel reservoir chamber and vapor to said fuel tank, said first fuel return passage connecting with said fuel reservoir chamber at a first connecting position; a fuel supply passage which connects said fuel reservoir chamber and said electronically controlled fuel injection apparatus; a filter arranged upstream of said electronically controlled fuel injection apparatus in said fuel reservoir chamber for eliminating vapor from fuel passing through said fuel supply passage prior to entry of the fuel into said electronically controlled fuel injection apparatus; and a second fuel return passage connecting said electronically controlled fuel injection apparatus with said first fuel return passage, said second fuel return passage having a portion disposed higher than said first connecting position. 18. The fuel injection system according to claim 17, wherein a filter which does not allow foreign particles to pass through but allows vapor to pass through is disposed at said second fuel return passage above said first connecting position. 19. The fuel injection system according to claim 17, wherein said fuel supply passage projects above a fuel level location in said fuel reservoir chamber, said fuel supply passage includes an opening that opens into said fuel reservoir chamber above the fuel level location, said fuel supply passage includes a fuel inlet opening which opens into a said fuel reservoir chamber below the fuel level location, and said fuel inlet opening is covered by said filter. 20. The fuel injection system according to claim 19, wherein a filter which does not allow foreign particles to pass through but allows vapor to pass through is attached to said opening of said fuel supply passage that opens into said fuel reservoir chamber above the fuel level location.
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이 특허에 인용된 특허 (5)
Cotton Kenneth J. (Caro MI) Roche Ronald H. (Cass City MI), Fuel handling system.
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