Device and method for diagnosing evaporated fuel processing device
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01M-003/04
F02M-025/08
G01M-003/32
G01M-003/26
출원번호
US-0380787
(2013-03-05)
등록번호
US-9494481
(2016-11-15)
우선권정보
JP-2012-052523 (2012-03-09)
국제출원번호
PCT/JP2013/055901
(2013-03-05)
국제공개번호
WO2013/133237
(2013-09-12)
발명자
/ 주소
Takakura, Shinsuke
출원인 / 주소
NISSAN MOTOR CO., LTD.
대리인 / 주소
Drinker Biddle & Reath LLP
인용정보
피인용 횟수 :
0인용 특허 :
12
초록▼
An evaporated fuel processing apparatus includes a valve between a canister and a fuel tank, and maintains the fuel tank in hermetic state by closing the valve while a vehicle is stationary, and adsorbs evaporated fuel by the canister by opening the valve during fuel filling, wherein the evaporated
An evaporated fuel processing apparatus includes a valve between a canister and a fuel tank, and maintains the fuel tank in hermetic state by closing the valve while a vehicle is stationary, and adsorbs evaporated fuel by the canister by opening the valve during fuel filling, wherein the evaporated fuel occurs in the fuel tank. A diagnostic apparatus includes: a pump connected to a canister-side region with respect to the valve, and configured to pressurize a system of the canister and the fuel tank; and a pressure sensor for sensing an internal pressure of the system. The diagnostic apparatus starts pressurization by the pump with the valve closed; brings the system into a pressurized state by opening the valve with a delay after the start of pressurization; and performs a leakage diagnosis based on a change in the internal pressure of the system from the pressurized state.
대표청구항▼
1. A diagnostic apparatus for an evaporated fuel processing apparatus, wherein the evaporated fuel processing apparatus includes a blocking valve configured to selectively allow and shut off communication between a canister and a fuel tank, and maintains the fuel tank in hermetic state by closing th
1. A diagnostic apparatus for an evaporated fuel processing apparatus, wherein the evaporated fuel processing apparatus includes a blocking valve configured to selectively allow and shut off communication between a canister and a fuel tank, and maintains the fuel tank in hermetic state by closing the blocking valve while a vehicle is stationary, and adsorbs evaporated fuel by the canister by opening the blocking valve during fuel filling, wherein the evaporated fuel occurs in the fuel tank, the diagnostic apparatus comprising: a pump connected to a canister-side region with respect to the blocking valve, and configured to pressurize an inside of a system, wherein the system includes the canister and the fuel tank; andat least one pressure sensor configured to sense an internal pressure of the system;wherein the diagnostic apparatus is configured to: start pressurization by the pump with the blocking valve closed;bring the inside of the system into a pressurized state by opening the blocking valve with a delay of a predetermined period after the start of pressurization; andperform a leakage diagnosis based on a change in the internal pressure of the system from the pressurized state. 2. The diagnostic apparatus as claimed in claim 1, wherein the diagnostic apparatus is configured to open the blocking valve in response to a condition where a pressure of the canister-side region becomes higher than or equal to a pressure of a fuel-tank-side region after the start of pressurization by the pump. 3. The diagnostic apparatus as claimed in claim 2, wherein the diagnostic apparatus is configured to open the blocking valve in response to a condition where the pressure of the canister-side region becomes higher than the pressure of the fuel-tank-side region by a predetermined pressure difference. 4. The diagnostic apparatus as claimed in claim 1, wherein the diagnostic apparatus is configured to open the blocking valve in response to a condition where a predetermined time has elapsed after the start of pressurization by the pump. 5. The diagnostic apparatus as claimed in claim 1, wherein the canister includes a first end and a second end in a flow direction, wherein a charge port and a purge port is arranged at the first end, and a drain port is disposed at the second end, wherein the second end is connected to the pump. 6. The diagnostic apparatus as claimed in claim 1, wherein the diagnostic apparatus is configured to maintain an inside of the fuel tank pressurized, by closing the blocking valve after termination of the diagnosis. 7. The diagnostic apparatus as claimed in claim 1, wherein: the at least one pressure sensor includes a pressure sensor provided in the canister-side region with respect to the blocking valve, and a pressure sensor provided in the fuel-tank-side region with respect to the blocking valve; andthe diagnostic apparatus is configured to: close the blocking valve after the inside of the entire system has been made pressurized by opening the blocking valve; andperform a leakage diagnosis for each of the canister-side region and the fuel-tank-side region. 8. A diagnostic method for an evaporated fuel processing apparatus, wherein the evaporated fuel processing apparatus includes a blocking valve configured to selectively allow and shut off communication between a canister and a fuel tank, and maintains the fuel tank in hermetic state by closing the blocking valve while a vehicle is stationary, and adsorbs evaporated fuel by the canister by opening the blocking valve during fuel filling, wherein the evaporated fuel occurs in the fuel tank, the diagnostic method comprising: bringing an inside of a system into hermetic state, wherein the system includes the canister and the fuel tank;starting pressurization by a pump via a canister-side region with respect to the blocking valve, with the blocking valve closed;opening the blocking valve with a delay of a predetermined period after the start of pressurization;stopping the pressurization in response to a condition where the inside of the entire system has been brought into a predetermined pressurized state; andperforming a leakage diagnosis based on a change in internal pressure of the system from the pressurized state. 9. The diagnostic method as claimed in claim 8, comprising opening the blocking valve in response to a condition where a pressure of the canister-side region becomes higher than or equal to a pressure of a fuel-tank-side region after the start of pressurization by the pump. 10. The diagnostic method as claimed in claim 8, comprising opening the blocking valve in response to a condition where a predetermined time has elapsed after the start of pressurization by the pump.
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이 특허에 인용된 특허 (12)
Otsuka Takayuki (Susono JPX) Osawa Kouichi (Susono JPX) Sugiyama Tatsumasa (Kariya JPX) Teraoka Katsuhiko (Aichi JPX) Kobayashi Nobuyuki (Toyota JPX) Okawa Koji (Toyota JPX), Apparatus for detecting malfunction in evaporated fuel purge system used in internal combustion engine.
DeBastos, Timothy; Kacewicz, John Michael; Bohr, Scott; Pearce, Russell Randall; Kragh, Christopher; Sullivan, Patrick; Euliss, William; Kluzner, Michael Igor, Method and system for fuel vapor control.
Kidokoro Toru (Susono JPX) Itoh Takaaki (Mishima JPX) Hyodo Yoshihiko (Susono JPX) Osanai Akinori (Susono JPX), Pressure control system for controlling pressure in fuel tank of engine by controlling discharging of evaporated fuel in.
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