# US 10,865,742 B2 · Evaporated fuel processing device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,742 B2 - Document ID: US10865742B2 - Status: Granted - Kind: B2 - Application number: 16/669,776 - Filed: 2019-10-31 - Published: 2020-05-07 - Granted: 2020-12-15 - Earliest claimed: 2018-11-06 - Assignees: Denso Corporation - Applicants: Denso Corporation - Inventors: Kosei Takagi - Web page: https://patentgrep.com/patent/US10865742B2 ## CPC - F02M 25/0818: {having means for pressurising the evaporative emission space} - B60K 15/03: Fuel tanks - F02D 41/003: {Adding fuel vapours, e.g. drawn from engine fuel reservoir} - F02M 25/0809: {Judging failure of purge control system} - 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} - F02M 25/0854: {Details of the absorption canister} - 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} - B60K 2015/0319: {with electronic systems, e.g. for controlling fuelling or venting} - B60K 2015/0321: {characterised by special sensors, the mounting thereof} - B60K 2015/03302: {Electromagnetic valves} - B60K 2015/03514: {with vapor recovery means} - F02M 2025/0845: {Electromagnetic valves} - 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 - F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W) ## Abstract An evaporated fuel processing device is configured to collect evaporated fuel from a fuel tank of an internal combustion engine. The evaporated fuel processing device includes the fuel tank, a canister, a tank sealing valve, a switching valve, and a differential pressure sensor. The fuel tank stores fuel for the internal combustion engine. The canister adsorbs evaporated fuel generated in the fuel tank. The switching valve switches between allowing and blocking off communication between the canister and open air. The differential pressure sensor detects a system differential pressure between the pressure on the canister side of the tank sealing valve and the pressure on the fuel tank side of the tank sealing valve in the detection target system. ## Claims ### Claim 1 An evaporated fuel processing device for recovering evaporated fuel from a fuel tank of an internal combustion engine, comprising: a fuel tank which stores fuel; a canister that adsorbs the evaporated fuel generated in the fuel tank; a tank sealing valve that switches between allowing and blocking communication between the fuel tank and the canister; a switching valve that switches between allowing and blocking communication between the canister and open air; and a differential pressure sensor configured to detect a system differential pressure of a detection target system including the canister and the fuel tank, the system differential pressure being a pressure difference between a pressure on the canister side of the tank sealing valve and a pressure on the fuel tank side of the tank sealing valve. ### Claim 2 (depends on 1) The evaporated fuel processing device according to claim 1, further comprising: a leakage diagnosis unit configured to perform a leakage diagnosis in the detection target system based on the system differential pressure. ### Claim 3 (depends on 2) The evaporated fuel processing device according to claim 2, wherein the differential pressure sensor is configured to detect a differential pressure ΔP1, the differential pressure ΔP1 being the system differential pressure while the switching valve is open and the tank sealing valve is closed, and the leakage diagnosis unit is configured to, based on the differential pressure ΔP1, perform a leakage diagnosis for a tank-side region of the detection target system, the tank-side region being on the fuel tank side of the tank sealing valve. ### Claim 4 (depends on 2) The evaporated fuel processing device according to claim 2, further comprising: a pump disposed on the open air side of the canister within the detection target system, the pump being configured to pressurize or depressurize the detection target system, wherein the differential pressure sensor is configured to detect a differential pressure ΔP2, the differential pressure ΔP2 being the system differential pressure after the switching valve is closed, the tank sealing valve is closed, and the pump is operated, the leakage diagnosis unit is configured to perform a leakage diagnosis for a canister-side region of the detection target system based on: whether the differential pressure ΔP2 has reached a predetermined value, or a change in the differential pressure ΔP2 during a predetermined time period after the pump is stopped, and the canister-side region is a region on the canister side of the tank sealing valve. ### Claim 5 (depends on 2) The evaporated fuel processing device according to claim 2, further comprising: a pump disposed on the open air side of the canister within the detection target system, the pump being configured to pressurize or depressurize the detection target system, wherein the differential pressure sensor is configured to detect a differential pressure ΔP3, the differential pressure ΔP3 being the system differential pressure after the pump is operated while the switching valve is closed and the tank sealing valve is open, the leakage diagnosis unit is configured to perform a leakage diagnosis for a tank-side region of the detection target system based on: whether the differential pressure ΔP3 has reached a predetermined value, or a change in the differential pressure ΔP3 during a predetermined time period after the pump is operated for a preset period, the pump is stopped, and then the tank sealing valve is closed and the switching valve is opened, and the tank-side region is a region on the fuel tank side of the tank sealing valve. ### Claim 6 An evaporated fuel processing device for recovering evaporated fuel from a fuel tank of an internal combustion engine, comprising: a fuel tank which stores fuel; a canister that adsorbs the evaporated fuel generated in the fuel tank; a tank sealing valve that switches between allowing and blocking communication between the fuel tank and the canister; a switching valve that switches between allowing and blocking communication between the canister and open air; a differential pressure sensor configured to detect a system differential pressure of a detection target system including the canister and the fuel tank, the system differential pressure being a pressure difference between a pressure on the canister side of the tank sealing valve and a pressure on the fuel tank side of the tank sealing valve; and a processor coupled to the differential pressure sensor programmed to perform a leakage diagnosis in the detection target system based on the system differential pressure received from the differential pressure sensor. ### Claim 7 (depends on 6) The evaporated fuel processing device according to claim 6, wherein the differential pressure sensor is configured to detect a differential pressure ΔP1, the differential pressure ΔP1 being the system differential pressure while the switching valve is open and the tank sealing valve is closed, and the processor is programmed to determine, based on the differential pressure ΔP1, whether a leak has occurred in a tank-side region of the detection target system, the tank-side region being on the fuel tank side of the tank sealing valve. ### Claim 8 (depends on 6) The evaporated fuel processing device according to claim 6, further comprising: a pump disposed on the open air side of the canister within the detection target system, the pump being configured to pressurize or depressurize the detection target system, wherein the differential pressure sensor is configured to detect a differential pressure ΔP2, the differential pressure ΔP2 being the system differential pressure after the switching valve is closed, the tank sealing valve is closed, and the pump is operated, the processor is programmed to: determine whether the differential pressure ΔP2 has reached a predetermined value, and determine whether a leak has occurred in a canister-side region of the detection target system on the canister side of the tank sealing valve based on whether the differential pressure ΔP2 has reached the predetermined value. ### Claim 9 (depends on 6) The evaporated fuel processing device according to claim 6, further comprising: a pump disposed on the open air side of the canister within the detection target system, the pump being configured to pressurize or depressurize the detection target system, wherein the differential pressure sensor is configured to detect a differential pressure ΔP2, the differential pressure ΔP2 being the system differential pressure after the switching valve is closed, the tank sealing valve is closed, and the pump is operated, the processor is programmed: monitor the differential pressure ΔP2 for a predetermined time period after the pump is stopped, and determine whether a leak has occurred in a canister-side region of the detection target system on the canister side of the tank sealing valve based on whether a change in the differential pressure ΔP2 during the predetermined time period is under a predetermined threshold. ### Claim 10 (depends on 6) The evaporated fuel processing device according to claim 6, further comprising: a pump disposed on the open air side of the canister within the detection target system, the pump being configured to pressurize or depressurize the detection target system, wherein the differential pressure sensor is configured to detect a differential pressure ΔP3, the differential pressure ΔP3 being the system differential pressure after the pump is operated while the switching valve is closed and the tank sealing valve is open, the processor is programmed to: determine whether the differential pressure ΔP3 has reached a predetermined value, and determine whether a leak has occurred in a tank-side region of the detection target system on the fuel tank side of the tank sealing valve based on whether the differential pressure ΔP3 has reached the predetermined value. ### Claim 11 (depends on 6) The evaporated fuel processing device according to claim 6, further comprising: a pump disposed on the open air side of the canister within the detection target system, the pump being configured to pressurize or depressurize the detection target system, wherein the differential pressure sensor is configured to detect a differential pressure ΔP3, the differential pressure ΔP3 being the system differential pressure after the pump is operated while the switching valve is closed and the tank sealing valve is open, the processor is programmed to: control the pump to operate for a preset period then stop the pump, after stopping the pump, controlling the tank sealing valve to close and the switching valve to open, after controlling the tank sealing valve and the switching valve, monitor the differential pressure ΔP3 for a predetermined time period, and determine whether a leak has occurred in a tank-side region of the detection target system on the fuel tank side of the tank sealing valve based on whether a change in the differential pressure ΔP3 during the predetermined time period is under a predetermined threshold.