SYSTEMS AND METHODS FOR FUEL SYSTEM PRESSURE SENSOR RATIONALIZATION
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United States of America Patent
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Issued Date -
Apr 2, 2020
app pub date -
Oct 1, 2018
filing date -
Oct 1, 2018
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Abstract
Methods and systems are provided for determining an offset of a pressure sensor that is used for monitoring pressure in a fuel system that is sealed expect for refueling and other diagnostic events. In one example, a method includes waking a controller of a vehicle when it is expected that a pressure in a fuel system that is sealed from atmospheric pressure is at atmospheric pressure, unsealing the fuel system, and indicating an offset of the pressure sensor based on a pressure change after the fuel system is unsealed. In this way, pressure sensor offset may be determined regularly without undesirably loading a fuel vapor storage canister with vapors, which may be particularly advantageous for hybrid vehicles.
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