FUEL SYSTEM HAVING PRESSURE PULSATION DAMPING
First Claim
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1. A fuel delivery system for an internal combustion engine, said system having fuel pressure damping and comprising:
- a fuel feed line;
a fuel rail defining a fuel passageway therein, said rail being connected to said feed line to receive fuel from said feed line into said passageway;
a plurality of fuel injectors connected to said rail to receive fuel from said passageway to be delivered to the engine;
a compliance member located within said system, said compliant member decreasing the bulk modulus of said system;
at least a portion of said system defining a critical element of said system, said critical element significantly contributing to a resonant mode of said system during operation wherein a pressure pulsation occurs within said system; and
a fluid flow restrictor located within said system, said restrictor being located in relation to said critical element whereby the distance (E) from said restrictor to an end of said critical element is generally defined by the equation D=(1−
E)/0.00226, where E is the percent optimal benefit gained.
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Abstract
The invention relates to a fuel system having pressure pulsation damping. The invention specifically locates restrictors in relation to identified critical elements of the system to control the maximum operating system pulse magnitude, as well as damping the overall pulsations of the system.
33 Citations
21 Claims
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1. A fuel delivery system for an internal combustion engine, said system having fuel pressure damping and comprising:
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a fuel feed line;
a fuel rail defining a fuel passageway therein, said rail being connected to said feed line to receive fuel from said feed line into said passageway;
a plurality of fuel injectors connected to said rail to receive fuel from said passageway to be delivered to the engine;
a compliance member located within said system, said compliant member decreasing the bulk modulus of said system;
at least a portion of said system defining a critical element of said system, said critical element significantly contributing to a resonant mode of said system during operation wherein a pressure pulsation occurs within said system; and
a fluid flow restrictor located within said system, said restrictor being located in relation to said critical element whereby the distance (E) from said restrictor to an end of said critical element is generally defined by the equation D=(1−
E)/0.00226, where E is the percent optimal benefit gained. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A fuel delivery system for an internal combustion engine, said system having fuel pressure damping and comprising:
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a fuel feed line;
a fuel rail defining a fuel passageway therein, said rail being connected to said feed line to receive fuel from said feed line into said passageway;
a plurality of fuel injectors connected to said rail to receive fuel from said passageway to be delivered to the engine;
a compliance member located within said system, said compliant member decreasing the bulk modulus of said system;
at least a portion of said system defining a critical element of said system, said critical element significantly contributing to a resonant mode of said system during operation wherein a pressure pulsation occurs within said system; and
a fluid flow restrictor located within said system, said restrictor being located in relation to said critical element whereby the distance (D) from said restrictor to an end of said critical element is generally defined by the equation D=(1−
[Rr/Ra])/0.00226, where Rr is the required effect on the maximum pulse magnitude and Ra is the actual effect on the pulse magnitude. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A fuel delivery system for an internal combustion engine, said system having fuel pressure damping and comprising:
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a fuel feed line;
a fuel rail defining a fuel passageway therein, said rail being connected to said feed line to receive fuel from said feed line into said passageway;
a plurality of fuel injectors connected to said rail to receive fuel from said passageway to be delivered to the engine;
a compliance member located within said system, said compliant member decreasing the bulk modulus of said system;
at least a portion of said system defining a critical element of said system, said critical element significantly contributing to a resonant mode of said system during operation wherein a pressure pulsation occurs within said system of a magnitude beyond a predetermined limit; and
a fluid flow restrictor located within said system, said restrictor being located in relation to said critical element whereby the distance (D) from said restrictor to an end of said critical element results in a percent optimal benefit gained (E) that reduces the magnitude of the pressure pulsation to within the predetermined limit. - View Dependent Claims (18, 19, 20, 21)
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Specification