Pressure control system for controlling pressure in fuel tank of engine by controlling discharging of evaporated fuel in fuel tank into canister
First Claim
1. A pressure control system comprising:
- a pressure control means for allowing evaporated fuel in an fuel tank of an engine to be discharged to a canister during the engine running state, the canister absorbing the evaporated fuel;
the pressure control means continuing to allow evaporated fuel in the fuel tank to be discharged to the canister after the engine stops until a predetermined period has elapsed, Δ
the pressure control means allowing evaporated fuel in the fuel tank to be discharged to the canister while a pressure in the fuel tank is higher than a first predetermined pressure after the predetermined period has elapsed in the engine stopped state, the pressure control means preventing evaporated fuel in the fuel tank from being discharged to the canister when a pressure in the fuel tank is lower than the first predetermined pressure after the predetermined period has elapsed in the engine stopped state.
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Accused Products
Abstract
A pressure control device allows evaporated fuel evaporated in an fuel tank of an engine to be discharged to a canister during the engine running state. The canister absorbs the evaporated fuel. The pressure control device continues to allow evaporated fuel in the fuel tank to be discharged to the canister after the engine stops until a predetermined period has elapsed. The pressure control device allows evaporated fuel in the fuel tank to be discharged to the canister while a pressure in the fuel tank is higher than a first predetermined pressure after the predetermined period has elapsed in the engine stopped state. On the other hand, the pressure control device prevents evaporated fuel in the fuel tank from being discharged to the canister while a pressure in the fuel tank is lower than the first predetermined pressure after the predetermined period has elapsed in the engine stopped state.
54 Citations
20 Claims
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1. A pressure control system comprising:
a pressure control means for allowing evaporated fuel in an fuel tank of an engine to be discharged to a canister during the engine running state, the canister absorbing the evaporated fuel;
the pressure control means continuing to allow evaporated fuel in the fuel tank to be discharged to the canister after the engine stops until a predetermined period has elapsed, Δ
the pressure control means allowing evaporated fuel in the fuel tank to be discharged to the canister while a pressure in the fuel tank is higher than a first predetermined pressure after the predetermined period has elapsed in the engine stopped state, the pressure control means preventing evaporated fuel in the fuel tank from being discharged to the canister when a pressure in the fuel tank is lower than the first predetermined pressure after the predetermined period has elapsed in the engine stopped state.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A pressure control method comprising steps of:
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(a) allowing evaporated fuel in an fuel tank of an engine to be discharged to a canister during the engine running state, the canister absorbing the evaporated fuel; (b) continuing to allow evaporated fuel in the fuel tank to be discharged to the canister after the engine stops until a predetermined period has elapsed; (c-1) allowing evaporated fuel in the fuel tank to be discharged to the canister while a pressure in the fuel tank is higher than a first predetermined pressure after the predetermined period has elapsed; (c-2) preventing evaporated fuel in the fuel tank from being discharged to the canister while a pressure in the fuel tank is lower than the first predetermined pressure after the predetermined period has elapsed. - View Dependent Claims (17, 18, 19, 20)
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Specification