DEVICE AND METHOD FOR DIAGNOSING EVAPORATED FUEL PROCESSING DEVICE
First Claim
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; and
at 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; and
perform a leakage diagnosis based on a change in the internal pressure of the system from the pressurized state.
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Accused Products
Abstract
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.
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Citations
10 Claims
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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:
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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; and at 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; and perform a leakage diagnosis based on a change in the internal pressure of the system from the pressurized state. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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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:
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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; and performing a leakage diagnosis based on a change in internal pressure of the system from the pressurized state. - View Dependent Claims (9, 10)
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Specification