# US 10,502,165 B2 · Systems and methods for fuel vapor canister purge routing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,165 B2 - Document ID: US10502165B2 - Status: Granted - Kind: B2 - Application number: 15/827,039 - Filed: 2017-11-30 - Published: 2018-03-22 - Granted: 2019-12-10 - Earliest claimed: 2015-11-23 - Assignees: Ford Global Technologies, LLC - Applicants: Ford Global Technologies, LLC - Inventors: Aed M. Dudar - Web page: https://patentgrep.com/patent/US10502165B2 ## CPC - F02M 25/0836: {Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold} - B60K 15/03504: {adapted to avoid loss of fuel or fuel vapour, e.g. with vapour recovery systems} - B60K 15/03519: {Valve arrangements in the vent line} - F02M 25/0854: {Details of the absorption canister} - F02M 25/0872: {Details of the fuel vapour pipes or conduits} - F02M 25/089: {Layout of the fuel vapour installation} - B60K 2015/03514: {with vapor recovery means} - B60Y 2200/92: Hybrid vehicles - F02M 25/0809: {Judging failure of purge control system} - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY ## Abstract A method for an engine is presented, wherein purge air is routed through a fuel vapor canister during a first condition such that desorbed fuel vapor traverses a canister purge port en route to an engine intake, and wherein purge air is routed through a fuel vapor canister during a second condition such that desorbed fuel vapor traverses a canister load port en route to the engine intake. Bypassing the canister purge port during a canister purge event allows for cleaning adsorbed fuel vapor from the canister even if flow through the canister purge port is restricted. In this way, vehicle emissions may be mitigated during conditions where a carbon dust filter at the canister load port is clogged. ## Claims ### Claim 1 A method for an engine, comprising: during a first condition, placing a purge routing valve in a first conformation and routing purge air through a fuel vapor canister such that desorbed fuel vapor traverses a canister purge port en route to an engine intake; and during a second condition, placing the purge routing valve in a second conformation and routing purge air through the fuel vapor canister such that desorbed fuel vapor traverses a canister load port en route to the engine intake, a fuel tank coupled to the load port via a fuel tank ventilation line, wherein the purge routing valve is coupled to the load port via the fuel tank ventilation line, a vapor blocking valve coupled within the fuel tank ventilation line between the fuel tank and the fuel vapor canister. ### Claim 2 (depends on 1) The method of claim 1, further comprising opening a canister purge valve during the first condition, wherein the canister purge port is fluidically coupled to a canister purge line when the purge routing valve is in the first conformation. ### Claim 3 (depends on 2) The method of claim 2, further comprising opening the canister purge valve during the second condition, wherein the canister load port is fluidically coupled to the canister purge line when the purge routing valve is placed in the second conformation, and wherein the canister purge port is not fluidically coupled to the canister purge line when the purge routing valve is placed in the second conformation. ### Claim 4 (depends on 1) The method of claim 1, wherein the first condition includes an indication that flow through the canister purge port is not restricted. ### Claim 5 (depends on 1) The method of claim 1, wherein the second condition includes an indication that flow through the canister purge port is restricted. ### Claim 6 A fuel system, comprising: a fuel vapor canister comprising at least a load port and a purge port; a canister purge line coupled between the fuel vapor canister and an engine intake; a purge routing valve coupled to the canister purge line, such that when the purge routing valve is in a first conformation, the canister purge line is fluidically coupled to the fuel vapor canister via the purge port, and when the purge routing valve is in a second conformation, the canister purge line is fluidically coupled to the fuel vapor canister via the load port and not via the purge port; a fuel tank coupled to the load port via a fuel tank ventilation line, wherein the purge routing valve is coupled to the load port via the fuel tank ventilation line; and a vapor blocking valve coupled within the fuel tank ventilation line between the fuel tank and the fuel vapor canister. ### Claim 7 (depends on 6) The fuel system of claim 6, wherein the purge routing valve is coupled to the fuel tank ventilation line at an intersection between the vapor blocking valve and the load port. ### Claim 8 (depends on 7) The fuel system of claim 7, wherein the purge routing valve is coupled to the fuel tank ventilation line via a branch conduit. ### Claim 9 (depends on 6) The fuel system of claim 6, wherein the fuel vapor canister further comprises a vent port coupled to a canister vent line, wherein a canister vent valve is coupled between the vent port and atmosphere, and wherein a canister purge valve is coupled between the purge routing valve and the engine intake. ### Claim 10 (depends on 6) The fuel system of claim 6, further comprising a carbon dust filter coupled within the fuel vapor canister at the purge port.