Fuel vapor leak check module
First Claim
1. A fuel vapor leak check module for detecting a fuel vapor leakage from a fuel tank, comprising:
- a canister port which is installed so that the port can be opened to the air and is connected to the interior of the fuel tank through a canister for absorbing fuel vapor produced in the fuel tank;
a pump means which depressurizes or pressurizes the interior of the fuel tank through the canister port;
a connecting passage which is coaxially provided in the canister port, is connected to the canister port, and is depressurized or pressurized by the pump means; and
a standard orifice which is coaxially provided in the connecting passage and reduces the passage area of the connecting passage.
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Accused Products
Abstract
A fuel vapor leakage check module has a canister port which is provided so that the port can be opened to the air and is connected to the interior of a fuel tank through a canister for absorbing fuel vapor produced in the fuel tank. A pump depressurizes or pressurizes the interior of the fuel tank through the canister port. A connecting passage which is coaxially provided in the canister port, is connected to the canister port. The connecting passage is depressurized or pressurized by the pump. A standard orifice is coaxially provided in the connecting passage and reduces the passage area of the connecting passage.
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Citations
13 Claims
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1. A fuel vapor leak check module for detecting a fuel vapor leakage from a fuel tank, comprising:
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a canister port which is installed so that the port can be opened to the air and is connected to the interior of the fuel tank through a canister for absorbing fuel vapor produced in the fuel tank;
a pump means which depressurizes or pressurizes the interior of the fuel tank through the canister port;
a connecting passage which is coaxially provided in the canister port, is connected to the canister port, and is depressurized or pressurized by the pump means; and
a standard orifice which is coaxially provided in the connecting passage and reduces the passage area of the connecting passage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification