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A METHOD TO WAKEUP PCM DURING VEHICLE REFUELING EVENT

IP.com Disclosure Number: IPCOM000241640D
Publication Date: 2015-May-19
Document File: 1 page(s) / 245K

Publishing Venue

The IP.com Prior Art Database

Abstract

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A METHOD TO WAKEUP PCM DURING VEHICLE REFUELING EVENT

Most PCMs are typically in an off state during vehicle refueling as the driver turns the key off before commencing a refueling event.Refueling operation can occur at any time after key off. It is difficult to predict when the customer is going to refuel, as some customers choose to go inside the gas station and buy goods before refueling. Hence keeping the PCM alive after key off for a few minutes to see if refueling is taking place is not an efficient way to sense refueling. There are many advantages to waking up the PCM during a refueling event. A list includes: 1) Canister diagnostics and loading estimation, 2) Fuel level indicator diagnostics, 3) Aborting post key off Evap leak detection method. The state of the canister is typically unknown at key up. By having a temperature sensor or hydrocarbon sensor in the canister, the loading state can be estimated during refueling. Even though the canister gets hot during refueling, the heat goes away after few hours. To determine canister loading using a temperature heat gain, the PCM must be awakened to record the refueling event canister's heat gain. Fuel Level Indicator (FLI) diagnostics are more efficient during refueling as the sender moves faster. The entire resistive track of the fuel sender can be diagnosed in a matter of minutes when refueling at 10 GPM rate. Most methods rationalize the FLI on the slow fuel consumption cycle, which can take many days....