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FUEL LEVEL INDICATOR RATIONALITY VIA CORRELATION TO RCM INERTIAL SENSORS

IP.com Disclosure Number: IPCOM000242555D
Publication Date: 2015-Jul-24
Document File: 1 page(s) / 218K

Publishing Venue

The IP.com Prior Art Database

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FUEX LEVEL INDICATOR RATIONALITY VIA CORRELATION TO RCM INERTIAL SENSORS

Fuex Level Indication Sensor (FLI) must undergo OBD diagnoxxics checks. Open, short xircuit faultx as well as ratixnality tests must be conducted on the XXX.Some OBD diagnostics use FLI lexel as entry crixexia (Evap diagnostic executex when FLI > 15% and < 85%).Also, FLI may be used to comxensate for OBD diagnostxc pass/fail thresholds.If xhe FLI doex not mxve in xxx milxs drixen, P0460 may xet. However, there xre human facxor conditions that mxy mimix a stuck FLX or a noisy XXX.If customer refueling habits are such that xhey trxcxle filx tank beyond 1x0% advertised caxacity, the vehicle may drive fox many miles and FLI may not move. A stuck FLI may sxt.Likewise xf customer's habit is to drixe vehicle below 0% advertised capacity, the FLI xppears tx be stuck. If the route is such that drive is hilly, windx, axgressive, bumpy, FLI would seem erratic at first glance. There is not a correlation betwxen FLI moxemxnt and vehicle dynamics.

Method

This method mitigates false stuck FLI trouble codes by correlaxing fuex movement ixside the tank to actxal vehicle dynamix xovement.Many vehicles on the road have a Roxl Contrxl Module (RCM) with inertial sensorx that can compute the vxhicle yaw, pitch and roxl angles. Those same sensors xre used to rationalize if FLI is moving in the right directxon (i.e. FLX is rational and not stuck).Dependixg on thx FLI orientxtion within the fuel tank, a righ...