초록 ▼

A method is presented for controlling fuel tank pressure in an internal combustion engine. The engine, the fuel tank and the carbon canister are connected in a three-way connection. The engine can be selectively isolated by a purge control valve, and the fuel tank can be selectively isolated by a fu

A method is presented for controlling fuel tank pressure in an internal combustion engine. The engine, the fuel tank and the carbon canister are connected in a three-way connection. The engine can be selectively isolated by a purge control valve, and the fuel tank can be selectively isolated by a fuel tank control valve. The operation of both valves is coordinated by an electronic engine controller. By isolating the fuel tank during the carbon canister purge, better estimate of the fuel fraction flowing into the engine can be achieved, thereby improving fuel economy.

대표청구항 ▼

1. A method for controlling an internal combustion engine in a vehicle having a fuel purge control system having a fuel vapor storage device, a fuel tank, a purge control valve and a tank control valve, the method comprising the steps of:estimating a fuel fraction coming from the fuel vapor storage

1. A method for controlling an internal combustion engine in a vehicle having a fuel purge control system having a fuel vapor storage device, a fuel tank, a purge control valve and a tank control valve, the method comprising the steps of:estimating a fuel fraction coming from the fuel vapor storage device into the engine when the fuel tank is isolated from the engine and from the canister; and adjusting an engine parameter based on said estimated fuel fraction.