Fuel vapor leak detecting apparatus, and fuel supplying apparatus to be applied to the same
First Claim
1. A fuel vapor leak detecting apparatus, comprising:
- a valve which is in a vapor purge system including a canister that is communicated with a fuel tank and an internal combustion engine, and which controllably closes the vapor purge system;
a pressurizing section which introduces atmospheric air into the vapor purge system to pressurize the vapor purge system; and
an internal-pressure measuring section which detects an internal pressure of the vapor purge system;
wherein the pressurizing section supplies the air for a predetermined time in a state where the vapor purge system is closed, and, when the internal pressure measured by the internal-pressure measuring section at the air supply is equal to or lower than a preset criterion pressure, it is judged that leak occurs.
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Accused Products
Abstract
A fuel vapor leak detecting apparatus, includes: a valve which is in a vapor purge system including a canister that is communicated with a fuel tank and an internal combustion engine, and which controllably closes the vapor purge system; a pressurizing section which introduces atmospheric air into the vapor purge system to pressurize the vapor purge system; and an internal-pressure measuring section which detects an internal pressure of the vapor purge system. The pressurizing section supplies the air for a predetermined time in a state where the vapor purge system is closed. When the internal pressure measured by the internal-pressure measuring section at the air supply is equal to or lower than a preset criterion pressure, it is judged that leak occurs.
28 Citations
17 Claims
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1. A fuel vapor leak detecting apparatus, comprising:
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a valve which is in a vapor purge system including a canister that is communicated with a fuel tank and an internal combustion engine, and which controllably closes the vapor purge system;
a pressurizing section which introduces atmospheric air into the vapor purge system to pressurize the vapor purge system; and
an internal-pressure measuring section which detects an internal pressure of the vapor purge system;
wherein the pressurizing section supplies the air for a predetermined time in a state where the vapor purge system is closed, and, when the internal pressure measured by the internal-pressure measuring section at the air supply is equal to or lower than a preset criterion pressure, it is judged that leak occurs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A fuel vapor leak detecting apparatus, comprising:
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a bypass valve which is openable and closable, which is in a vapor purge system including a canister that is communicated with a fuel tank and an internal combustion engine, and which bypasses a two-way valve interposed between the fuel tank and the canister;
a reference orifice which is connected in series to the bypass valve;
a communication valve which controls communication between the canister and an ambient;
a pressurizing section which introduces atmospheric air into the fuel tank; and
an internal-pressure measuring section which detects an internal pressure of the fuel tank;
wherein a reference pressure rise rate at a timing when the pressurizing section supplies the air for a second predetermined time in a state where the communication valve and the bypass valve are opened is set, and, when a pressure rise rate at a timing when a time which is twice the second predetermined time has elapsed after the communication valve is closed is equal to or smaller than the reference pressure rise rate, it is judged that leak occurs. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A fuel supplying apparatus which is to be applied to a fuel vapor leak detecting apparatus, and which is to be disposed inside a fuel tank through an opening, comprising:
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a fuel pump;
a fuel filter;
a jet pump;
an air intake pipe;
an internal-pressure sensor; and
an electrical connector wherein the fuel pump, the fuel filter, the jet pump, the air intake pipe, the internal-pressure sensor, and the electrical connector are configured integrally with a flange for closing the opening, or a support member continuous to the flange.
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Specification