Evaporative emission control system for internal combustion engines
First Claim
1. In an evaporative emission control system for an internal combustion engine, including a fuel tank, a canister for adsorbing evaporative fuel generated from the fuel tank, a passage communicating between said fuel tank and said canister, valve means for opening said passage when pressure within part of said evaporative emission control system upstream of said valve means exceeds a predetermined value and closing said passage when said pressure within said part of said evaporative emission control system is below said predetermined value, and pressure-detecting means for detecting said pressure within said part of said evaporative emission control system,the improvement comprising:
- diagnosis means for determining that said evaporative emission control system is normal when a value of said pressure within said part of said evaporative emission control system detected by said pressure-detecting means is lower than a predetermined reference value below atmospheric pressure.
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Abstract
An evaporative emission control system includes a valve arranged in a passage communicating between a fuel tank and a canister. The valve opens the passage when pressure within part of the evaporative emission control system upstream of the valve exceeds a predetermined value and, closes the passage when the pressure is below the predetermined value. It is determined that the evaporative emission control system is normal when a value of the pressure with the part of the system detected by a pressure sensor is lower than a predetermined reference value below atmospheric pressure.
35 Citations
10 Claims
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1. In an evaporative emission control system for an internal combustion engine, including a fuel tank, a canister for adsorbing evaporative fuel generated from the fuel tank, a passage communicating between said fuel tank and said canister, valve means for opening said passage when pressure within part of said evaporative emission control system upstream of said valve means exceeds a predetermined value and closing said passage when said pressure within said part of said evaporative emission control system is below said predetermined value, and pressure-detecting means for detecting said pressure within said part of said evaporative emission control system,
the improvement comprising: diagnosis means for determining that said evaporative emission control system is normal when a value of said pressure within said part of said evaporative emission control system detected by said pressure-detecting means is lower than a predetermined reference value below atmospheric pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
Specification