Low emission combustion system for internal combustion engine using multiple spark

In an internal combustion engine having a cylinder and a piston therein, a reduced emission combustion system capable of accommodating a relatively lean air/fuel mixture comprising:

• a combustion chamber with a first end and a second end, a portion including the first end overlying the top of the cylinder and the second end spaced from the top of the cylinder;
• the second end of said combustion chamber having a greater volume than said first end;
• said combustion chamber having an upper wall formed to provide an undivided combustion chamber at top dead center of said piston;
• a squish area of relatively high area/volume ratio located above the top of the cylinder in registry with said first end of said combustion chamber for providing turbulence;
• an intake valve and an exhaust valve disposed in said combustion chamber;
• a first igniting means located proximate said first end of said combustion chamber;
• a second igniting means located proximate said second end of said combustion chamber;
• means for actuating said first igniting means and thereafter actuating said second igniting means;
• and
• means for introducing a relatively lean/air mixture into said combustion chamber.

In an internal combustion engine having a cylinder and a piston therein, a low emission type combustion system comprising:

• a combustion chamber with a relatively broad end a relatively narrow end spaced therefrom, a portion of the narrow end of said chamber overlying the top of said cylinder;
• said combustion chamber having an upper wall formed to provide an undivided combustion chamber at top dead center of said piston,
• an intake valve and an exhaust valve disposed in the broad end of said combustion chamber,
• a first igniting means located proximate the narrow end of said combustion chamber and having a portion extending through said upper wall and into said combustion chamber;
• a second igniting means located proximate the broad end of said combustion chamber and having a portion extending through said upper wall and into said combustion chamber;
• means for introducing a relatively lean fuel/air mixture into said combustion chamber;
• and
• means for actuating said first igniting means and thereafter actuating said second igniting means.

In an internal combustion engine having a cylinder and a piston therein, a reduced emission combustion system for accommodating a relatively lean air/fuel mixture comprising:

• a combustion chamber with a first end and a second end, a portion of the combustion chamber including the second end overlying the top of the cylinder;
• a squish area of relatively high area/volume ratio located above the top of the cylinder adjacent said second end of said combustion chamber for providing turbulence;
• intake and exhaust means communicating with said combustion chamber, said intake means including means for delivering a relatively lean fuel/air mixture to said combustion chamber;
• a first igniting means located proximate said second end of said combustion chamber and a second igniting means spaced from said first igniting means;
• and
• means for actuating said first and second igniting means sequentially, both said igniting means actuated before top dead center position of said piston and being actuated at least four crankshaft degrees apart.