Ignition system in dual spark plug ignition engine with EGR system
First Claim
1. A four stroke internal combustion engine having a combustion chamber defined between a cylinder head and a piston, said engine having an exhaust and an intake and an electric source, said engine further including means for recirculating a portion of exhaust gases from the engine back to the engine intake, said engine including:
- first and second spark plugs disposed in the combustion chamber and operative to ignite an air-fuel mixture applied to said combustion chamber;
first transforming means for transforming electric current from said electric source into a high voltage current, electrically connectable to said first spark plug for placing said first spark plug in an operative condition;
second transforming means for transforming electric current from said electric source into a high voltage current, electrically connectable to said second spark plug for putting said second spark plug into an operative condition;
first switching means, responsive to at least one engine operating parameter, for interrupting an electrical connection between said first transforming means and said electric source when said at least one engine operating parameter is at a predetermined value indicative of a high power output engine operating range; and
second switching means, responsive to an engine operating parameter indicative of engine starting, for establishing an electrical connection between said first transforming means and said electric source, said second switching means independent of the operation of said first switching means;
said first switching means comprises a relay switch electrically connected between said first transforming means and the electric source to interrupt the electrical connection therebetween when actuated, andan intake vacuum responsive switch to be actuated to, in turn, actuate said relay switch when intake vacuum of the engine is below a predetermined level which is encountered at the high power output engine operating range, and said second switching means comprises;
an engine starting sensing switch to interrupt the electrical connection between said relay switch and said intake vacuum responsive switch when the engine operating parameter represents the engine starting.
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Abstract
A dual spark plug ignition engine with an EGR system is provided with an ignition system which is arranged to achieve single spark plug ignition by sensing a considerably low intake vacuum which represents high power output engine operating range. The engine is further provided with an engine starting sensing switch to cause the ignition system to carry out dual spark plug ignition during engine starting although the intake vacuum is considerably low as at the high power output engine operating range.
15 Citations
14 Claims
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1. A four stroke internal combustion engine having a combustion chamber defined between a cylinder head and a piston, said engine having an exhaust and an intake and an electric source, said engine further including means for recirculating a portion of exhaust gases from the engine back to the engine intake, said engine including:
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first and second spark plugs disposed in the combustion chamber and operative to ignite an air-fuel mixture applied to said combustion chamber; first transforming means for transforming electric current from said electric source into a high voltage current, electrically connectable to said first spark plug for placing said first spark plug in an operative condition; second transforming means for transforming electric current from said electric source into a high voltage current, electrically connectable to said second spark plug for putting said second spark plug into an operative condition; first switching means, responsive to at least one engine operating parameter, for interrupting an electrical connection between said first transforming means and said electric source when said at least one engine operating parameter is at a predetermined value indicative of a high power output engine operating range; and second switching means, responsive to an engine operating parameter indicative of engine starting, for establishing an electrical connection between said first transforming means and said electric source, said second switching means independent of the operation of said first switching means; said first switching means comprises a relay switch electrically connected between said first transforming means and the electric source to interrupt the electrical connection therebetween when actuated, and an intake vacuum responsive switch to be actuated to, in turn, actuate said relay switch when intake vacuum of the engine is below a predetermined level which is encountered at the high power output engine operating range, and said second switching means comprises; an engine starting sensing switch to interrupt the electrical connection between said relay switch and said intake vacuum responsive switch when the engine operating parameter represents the engine starting. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification