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Method and device for integrative control of gas engine

  • US 7,650,223 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 the air and the mixture is controlled in its flow rate by a throttle valve and supplied to combustion chambers and the gas burnt in the combustion chamber is exhausted through an exhaust pipe of the engine, comprisinga 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 the 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,wherein correction of theoretical air fuel ratio in accordance with exhaust temperature is performed in the air fuel ratio control process, the correction being done to correct the theoretical air fuel ratio used to calculate the command value of fuel-air mixture flow rate in accordance with exhaust temperature based on deviation of actual exhaust temperature from target exhaust temperature prescribed for various engine rotation speeds and load factors.

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