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A METHOD TO INFER VEHICLE FUEL TYPE VIA GPS LOCATION AND MAPPED SEASONAL FUEL INFORMATION

IP.com Disclosure Number: IPCOM000235552D
Publication Date: 2014-Mar-07
Document File: 1 page(s) / 297K

Publishing Venue

The IP.com Prior Art Database

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A METHOD TO INFER VEHICLE FUEL TYPE VIA

GPS LOCATION AND MAPPED SEASONAL FUEL INFORMATION

Vehicles sold in North America are required to perform diagnostics on various powertrain subsystems. One such subsystem is the Evap. For federal states, the Evap system is monitored for a leak size of 0.04". For green states, the system is monitored for a leak size of 0.02". Fuel characteristics such as(octane level, % ethanol, RVP) is a major unknown factor in most vehicles. PCM strategies have to infer the fuel characteristics from combustion event feedback (O2) sensors. Many powertrain control features (spark, fueling, knock) need knowledge of the fuel type in order to function properly. OBDII diagnostics (misfire, Evap) also need fuel type knowledge. The Evap monitor needs to know the fuel RVP (summer vs. winter fuel) in order to adjust pass/fail thresholds accordingly. The Misfire monitor needs knowledge of % ethanol and octane type. Currently, PCM strategy attempts to infer some fuel characteristics such as % ethanol. However, this inference can have errors in it and only works in a combusting engine. In HEV, the fuel type inference may not be available at times due to limited engine run time.

Method

The novelty of this method is to leverage built in GPS in the vehicle and infer the fuel RVP, methanol mix from mapped fuel types for different seasons inside the PCM. See map below for types of fuels used in different seasons in the US. When vehicle fills up at a gas sta...