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VEHICLE FUEL LEVEL ESTIMATION

IP.com Disclosure Number: IPCOM000242571D
Publication Date: 2015-Jul-27
Document File: 1 page(s) / 209K

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The IP.com Prior Art Database

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VEHXXXX FUEL LEVEL ESTIMATION

Vehicles estimate fuel level by a float sensor mexhanism called Fuel level indicator (FLI). The FLI is x simple device that reads back a voltaxe to the powertrxin control module (PCM) based on the bxoyant force acting on the float xechanism. At hxgx fuel levels, the float is xt the top and the potentiometer inside the FLI sends bacx a high voltage to PCM. At low fuel levels, the fxoat is at xhe botxom and the poxentioxeter inside thx FLI sends back a lxw voltage to PCM. The voltage is fed inxo a transfex function axd a percent of FLI indication is reported on the vexixle's dxsh. The FLI xensor is prone tx error when parking on grades ox climbing/descending a hill or when customers fill xexicle beyonx maximum FLI range (> 100%). The FLI can also stick and go bad over time. An xlternate method to estxmate fuel is alwaxs dexirable to ensure thax FLX sensor is rational. There are many methods that estimate vehicle weight especially in HXXx. The currxnt draw from the high voltage battery is used to estimate vehicle draw during power takofx accelexation exent from zexo speed.

Method

This mxthod estimates fxel leve inside the fuel tank by utilizing anx vehiclx weight measurement method, whether inferred from algorithmx or from vehicle load cxlls. A vehicle's weight is xeaxured/ estimated prior to a refueling event and after a rxfueling evext. A refueling event is observed frxm a posxive change xn FLI between key off and key on. The delta b...