Spark-ignited gas engine

Abstract

Conventional spark-ignited gas engines with a mechanically controlled fuel feed valve have several disadvantages in terms of operation, expensive control, irregular combustion or unstable and unreliable operation, which in turn can lead to operational and mechanical problems. In order to eliminate these disadvantages it is suggested, according to the invention, that a controlled valve is installed in the fuel line upstream of the fuel feed valve so that in the fuel line between fuel feed valve and controlled valve a defined intermediate volume is created and gaseous fuel is fed via the controlled valve into the intermediate volume.

1 . A spark-ignited gas engine with a number of cylinders (z), wherein on each cylinder (z) a mechanical fuel feed valve ( 11 ) for the direct feeding of gaseous fuel into the cylinder (Z) and a fuel line ( 2 ) opening into the cylinder (Z) are provided and the fuel line ( 2 ) can be closed by the mechanical fuel feed valve ( 11 ) in the direction of the cylinder (Z), wherein the fuel line ( 2 ) upstream of the fuel feed valve ( 11 ) includes a controlled valve ( 10 ), so that in the fuel line ( 2 ) between fuel feed valve ( 11 ) and controlled valve ( 10 ) a defined intermediate volume ( 12 ) is created and in via the controlled valve ( 10 ) gaseous fuel can be fed to the intermediate volume ( 12 ). 
   
   
       2 . The spark-ignited gas engine according to  claim 1 , wherein the controlled valve ( 10 ) is a solenoid valve. 
   
   
       3 . The spark-ignited gas engine according to  claim 1 , including a control unit ( 20 ) for controlling the controlled valves ( 10 ) is connected to each controlled valve ( 10 ) via a control output (S). 
   
   
       4 . A method for controlling a spark-ignited gas engine with a number of cylinders (Z), wherein on each cylinder (Z) a mechanical fuel feed valve ( 11 ) for the direct feeding of gaseous fuel into the cylinder (Z) and a fuel line ( 2 ) opening into the cylinder (Z) are provided and the fuel line ( 2 ) is closed by the mechanical fuel feed valve ( 11 ) in the direction of the cylinder (Z), including positioning a controlled valve in the fuel line ( 2 ) upstream of the fuel feed valve ( 11 ) so that in the fuel line ( 2 ) between fuel feed valve ( 11 ) and controlled valve ( 10 ) a defined intermediate volume ( 12 ) is created and the amount of fuel fed to the cylinder (Z) is set in that a defined amount of fuel is supplied to the intermediate volume ( 12 ) through the controlled valve ( 10 ). 
   
   
       5 . The method according to  claim 4 , including opening the controlled valve ( 10 ) after the fuel feed valve ( 11 ) is opened and closing the controlled valve before the fuel feed valve ( 11 ) is closed. 
   
   
       6 . The method according to  claim 4 , including opening the controlled valve ( 10 ) before the fuel feed valve ( 11 ) is opened. 
   
   
       7 . The method according to  claim 6 , including closing the controlled valve ( 10 ) before the fuel feed valve ( 11 ) is opened. 
   
   
       8 . The method according to  claim 4 , comprising feeding different amounts of fuel into different cylinders (Z). 
   
   
       9 . The method for converting a gas engine with a number of cylinders (Z), wherein on each cylinder (Z) a mechanical fuel feed valve ( 11 ) for the direct feeding of gaseous fuel into the cylinder (Z) and a fuel line ( 2 ) opening into the cylinder (Z) are provided which can be closed by the mechanical fuel feed valve ( 11 ) in the direction of the cylinder (Z), including inserting a controlled valve ( 10 ) in the fuel line ( 2 ) upstream of the fuel feed valve ( 11 ) so that a defined intermediate volume is created between fuel feed valve ( 11 ) and controlled valve ( 10 ). 
   
   
       10 . The method according to  claim 9 , wherein a fuel chamber is arranged between cylinder (Z) and fuel line ( 2 ).