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A METHOD TO WAKEUP PCM DURING REFUELING EVENT

IP.com Disclosure Number: IPCOM000240456D
Publication Date: 2015-Jan-30
Document File: 1 page(s) / 258K

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The IP.com Prior Art Database

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A METHOD TO WAKEUP PCM DURING REFUELING EVENT

Normally, a non-PHEV vehicle's powertrain control module (PCM) is typically in an off state during refueling. The driver normally keys off before commencing a refueling event.PHEV have sealed tanks and operator must press a switch button on the dash to request refueling. At that point, the PCM wakes up and relieves any pressure or vacuum inside the fuel system to facilitate refueling.Conventional cars have vented tanks. Hence, there is no need to depressurize the fuel tank during refueling, so refueling normally occurs with the PCM off as noted above.However, there are advantages to waking up the PCM during a refueling event. A short list of these advantages are as follows :1) canister loading estimation during refueling,2) fuel level indicator (FLI) diagnostics, 3) aborting afterrun Evap leak detection methods, 4) Evap System restriction analysis, 5) FTPT sensor rationality.

Method

Our new method provides for PCM wakeup during refueling. In one design, we have added proximity sensors to detect the insertion of the fuel filler. One particular design uses a capless unit having two flaps for better sealing in the closed position. When the dispensing nozzle is inserted into the capless unit, both flaps open/deflect. Proximity sensors detect when the flap is deflected sufficiently and when both sensors detect, a "wake" up signal to the PCM is sent to notify that a refueling nozzle is already inside the capless and a refuel event is about...