March 24, 2016 - 11:26 AM EDT
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Patent Issued for Methods and Apparatuses for Diagnosing Leaks in a Compressed Natural Gas Delivery System (USPTO 9284895)

By a News Reporter-Staff News Editor at Energy Weekly News -- From

Alexandria, Virginia
, VerticalNews journalists report that a patent by the inventors Naidu, Srini (
Northville, MI
); Cottrell, Michael (
White Lake, MI
), filed on October 23, 2012, was published online on March 15, 2016.

The patent's assignee for patent number 9284895 is FCA UA LLC (

Auburn Hills, MI
).

News editors obtained the following quote from the background information supplied by the inventors: "As natural gas is becoming a viable alternative energy source to oil, a move towards manufacturing vehicles powered by compressed natural gas (CNG) is gaining momentum. In order to store CNG in a fuel tank, the CNG is pressurized and stored in a CNG tank of the vehicle. The CNG is delivered to a vehicle engine by a CNG delivery system. Generally, the CNG delivery system depressurizes and injects the CNG into the vehicle engine."

As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "According to various embodiments of the present disclosure, a method for detecting a leak in a compressed natural gas (CNG) delivery system of a vehicle is disclosed. The method includes determining a first amount of CNG in a CNG tank of the vehicle, the first amount corresponding to a first time, and determining a second amount of CNG in the CNG tank at a second time, the second time being subsequent to the first time. The method further includes determining an expected CNG consumption of the vehicle during a period of time, the period of time beginning at the first time and ending at the second time. The method also includes determining an actual CNG consumption during the period of time based on the first amount of CNG and the second amount of CNG, and comparing the actual CNG consumption and the expected CNG consumption to determine whether a leak has occurred.

"According to various embodiments of the present disclosure, a method for detecting a leak in a compressed natural gas (CNG) delivery system of a vehicle is disclosed. The method includes determining a first CNG pressure measurement at a predetermined section in the CNG delivery system at a first time and obtaining a second CNG pressure measurement at the predetermined section. The second CNG pressure measurement is indicative of a CNG pressure measurement taken at a second time. The second time is previous to the first time and corresponding to when the vehicle was last turned off. The method also includes determining an actual pressure difference based on the first CNG pressure measurement and the second CNG pressure measurement and determining a first ambient temperature at the first time. The method further includes obtaining a second ambient temperature corresponding to the second time, the second ambient temperature corresponding to when the vehicle was last turned off. The method further includes determining an ambient temperature difference based on the first ambient temperature and the second ambient temperature, the ambient temperature difference being indicative of a change in temperature from the second time to the first time. The method also includes determining an expected pressure difference based on the ambient temperature difference and comparing the actual pressure difference with the expected pressure difference to determine whether a leak has occurred.

"Further areas of applicability of the teachings of the present disclosure will become apparent from the detailed description, claims and the drawings provided hereinafter, wherein like reference numerals refer to like features throughout the several views of the drawings. It should be understood that the detailed description, including disclosed embodiments and drawings referenced therein, are merely exemplary in nature intended for purposes of illustration only and are not intended to limit the scope of the present disclosure, its application or uses. Thus, variations that do not depart from the gist of the present disclosure are intended to be within the scope of the present disclosure."

For additional information on this patent, see: Naidu, Srini; Cottrell, Michael. Methods and Apparatuses for Diagnosing Leaks in a Compressed Natural Gas Delivery System.

U.S.
Patent Number 9284895, filed October 23, 2012, and published online on March 15, 2016. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=9284895.PN.&OS=PN/9284895RS=PN/9284895

Keywords for this news article include: Energy, Oil & Gas, FCA UA LLC, Natural Gas.

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