AUXILIARY-COMBUSTION-CHAMBER TYPE SPARK-IGNITION GAS-ENGINE

摘要

PROBLEM TO BE SOLVED: To simply achieve more stable combustion using other parameters without detecting a pressure within an auxiliary combustion chamber.

SOLUTION: A main-combustion-chamber gas-pressure adjustment valve 48a is provided for a main-combustion-chamber gas-supply branch pipe 28a supplying a fuel gas g to a main combustion chamber 68, and an auxiliary-combustion-chamber gas-pressure adjustment valve 48b is provided for an auxiliary-combustion-chamber gas-supply branch pipe 28b supplying fuel gas g to an auxiliary combustion chamber 72. A controller 50 controls a ratio ΔPp/ΔPm of a differential pressure ΔPp between an auxiliary-combustion-chamber fuel-gas pressure Pp and an air supply pressure Ps to a differential pressure ΔPm between a main-combustion-chamber fuel-gas pressure Pm and the air supply pressure Ps to control an auxiliary-combustion-chamber excess air ratio λ to a theoretical air/fuel ratio. This achieves stable combustion in the main-combustion-chamber 68.

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