Multi-point spark ignition engine provided with exhaust recirculation circuit
Patent 4202306 Issued on May 13, 1980. Estimated Expiration Date: 
October 24, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 24, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMulti-point spark ignition engine provided with exhaust recirculation circuit Patent #: 4133330 InventorsAssigneeApplicationNo. 05/954182 filed on 10/24/1978US Classes:123/310COMBUSTION CHAMBER HAVING MULTIPLE SPARK GAPSExaminersPrimary: Cox, Ronald B.International ClassesF02B 1/02 (20060101)F02F 1/24 (20060101) F02B 23/08 (20060101) F02B 1/00 (20060101) F02P 15/00 (20060101) F02M 25/07 (20060101) F02P 15/02 (20060101) F02D 37/02 (20060101) F02D 37/00 (20060101) F02B 1/04 (20060101) AbstractAn internal combustion engine of the reciprocating piston type, which is provided with an exhaust gas recirculation circuit to suppress the formation of NOx and has two or three spark plugs for each combustion chamber. There is a substantial overlap of the opening periods of exhaust and intake valves, so that a portion of the combustion gas is left unexhausted. The combustion chamber has a simple shape such as hemisphere, and the spark gaps of the plural spark plugs are arranged distant from each other in each combustion chamber so as to respectively share approximately equally divided portions of each combustion chamber. The number of the spark plugs is two when the volume of the recirculated exhaust gas, including the unexhausted combustion gas, is about 50% at the maximum of the volume of air admitted into the combustion chamber but three when the recirculated exhaust gas amounts to about 60% of the air at the maximum.Other References
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