Purge valve and fuel vapor management system
First Claim
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1. A fuel combustion engine comprising:
- a purge line comprising a carbon lined purge hose;
a combined purge throttle valve comprising;
a purge valve having a first inlet for coupling with an air cleaner to receive a first flow from the air cleaner and a second inlet for coupling with an evaporative canister via the purge line to receive a second flow from the evaporative canister; and
a throttle having an upstream side fluidically coupled to an outlet of the purge valve, the throttle providing a fluid path to a combustion chamber of the engine, the throttle integrally made with the purge valve in a common housing upstream of a turbo compressor;
an additional purge line fluidically coupled to the purge line between the evaporative canister and the second inlet and to an engine intake manifold downstream of the throttle;
an additional purge valve arranged in the additional purge line; and
a controller with instructions to send a signal to the purge valve and the additional purge valve to selectively adjust relative amounts of the first flow and the second flow allowed to pass through the outlet and to the combustion chamber,wherein the purge valve includes an operative position to allow hydrocarbons from the engine to migrate into the carbon lined purge hose, andwherein the additional purge line has an inner diameter smaller than an inner diameter of the purge line.
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Abstract
A purge valve and a fuel vapor management system for use with an engine emission control system are disclosed. The purge valve may include a first inlet for receiving a first flow of air from an air cleaner, a second inlet for receiving a second flow of purge vapors from an evaporative canister, and an outlet directing a controlled mixture of the first and second flows to an engine, upstream of an intake throttle. Relative amounts of the first flow and second flow may be selectively controlled by varying a position of the valve.
27 Citations
18 Claims
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1. A fuel combustion engine comprising:
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a purge line comprising a carbon lined purge hose; a combined purge throttle valve comprising; a purge valve having a first inlet for coupling with an air cleaner to receive a first flow from the air cleaner and a second inlet for coupling with an evaporative canister via the purge line to receive a second flow from the evaporative canister; and a throttle having an upstream side fluidically coupled to an outlet of the purge valve, the throttle providing a fluid path to a combustion chamber of the engine, the throttle integrally made with the purge valve in a common housing upstream of a turbo compressor; an additional purge line fluidically coupled to the purge line between the evaporative canister and the second inlet and to an engine intake manifold downstream of the throttle; an additional purge valve arranged in the additional purge line; and a controller with instructions to send a signal to the purge valve and the additional purge valve to selectively adjust relative amounts of the first flow and the second flow allowed to pass through the outlet and to the combustion chamber, wherein the purge valve includes an operative position to allow hydrocarbons from the engine to migrate into the carbon lined purge hose, and wherein the additional purge line has an inner diameter smaller than an inner diameter of the purge line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A fuel vapor management system, comprising:
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a purge valve arranged in an engine intake passage, the purge valve comprising; a first inlet for receiving atmospheric air as a first flow; a second inlet for receiving a purge flow from an evaporative canister as a second flow, the evaporative canister fluidically coupled with a fuel tank and configured for absorbing fuel vapor, the purge flow including desorbed fuel vapor; and an outlet for directing a selected mixture of the first flow and the second flow to an engine combustion chamber; a purge line fluidically coupling a downstream side of the evaporative canister with the second inlet; an additional purge line fluidically coupled to the purge line between the evaporative canister and the second inlet and to an engine intake manifold downstream of a throttle, wherein the additional purge line has an inner diameter smaller than an inner diameter of the purge line; an additional purge valve arranged in the additional purge line; and a controller with instructions to send a signal to the purge valve and the additional purge valve to adjust and coordinate opening of the purge valve and the additional purge valve based on a desired purge flow rate. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A fuel vapor management system for an engine comprising:
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an evaporative canister including a fuel vapor absorbing material; a turbo compressor on an induction air path for compressing an induction fluid before the induction fluid is passed to an intake manifold of the engine; a purge valve on the induction air path upstream from the turbo compressor having a first inlet to receive a first flow of atmospheric air, and having a second inlet to receive a second flow from the evaporative canister; the purge valve controllable to adjust relative amounts of the first flow and the second flow to pass to the turbo compressor; a purge line between the evaporative canister and the second inlet and including a fuel vapor absorbing material, the purge valve configured to selectively allow fuel vapors to migrate from the intake manifold to the purge line; an additional purge valve arranged in an additional purge line fluidically coupled to the purge line between the evaporative canister and the second inlet and to the intake manifold downstream of the turbo compressor, wherein the additional purge line has an inner diameter smaller than an inner diameter of the purge line; and a controller with instructions to; in a first mode, send a signal to open the purge valve during an engine off condition, and during a first purging operation following the engine off condition, send a signal to open each of the additional purge valve and the purge valve; and in a second mode, send a signal to close the purge valve during the engine off condition, and during a first purging operation following the engine off condition, send a signal to open the purge valve and close the additional purge valve. - View Dependent Claims (18)
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Specification