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Method and device for integrative control of gas engine

  • US 7,650,222 B2
  • Filed: 08/28/2008
  • Issued: 01/19/2010
  • Est. Priority Date: 08/30/2007
  • Status: Active Grant
First Claim
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1. An integrative control method of a gas engine in which fuel gas is introduced via a fuel gas flow control valve to a charging air supply pipe to be mixed with air therein and the mixture is controlled in its flow rate by a throttle valve and supplied to combustion chambers of the engine, comprising:

  • a speed control process for controlling engine rotation speed by calculating a command value of fuel gas flow rate based on deviation of a detected engine rotation speed from a target command value of engine rotation speed and controlling fuel gas flow rate flowing through the fuel gas flow control valve to coincide with the calculated command value of fuel gas flow rate, andan air fuel ratio control process for controlling air fuel ratio of fuel-air mixture supplied to the combustion chamber of the engine through performing feedback control in which such a command value of fuel-air mixture flow rate is calculated that air fuel ratio of the mixture coincides with an adequate value prescribed for each of detected values of operating conditions of the gas engine with the fuel gas flow flowing at the commanded fuel gas flow rate and a target opening of the throttle valve is determined based on deviation of an actual mixture flow rate calculated based on detected values of operating conditions of the gas engine from the calculated command value of fuel-air mixture flow rate,whereby at least either fuel gas flow correction or fuel-air mixture flow correction is performed when time-series variation of input signals relating to performance change of the gas engine exceeds a reference range determined beforehand, the fuel gas flow correction being performed by correcting control variables of the fuel gas flow control valve in the speed control process, and the mixture flow correction being performed by correcting opening of the throttle valve in the air fuel ratio control process.

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