Automotive internal combustion engine
First Claim
1. A spark-ignition multiple-cylinder internal combustion engine having a first set of cylinders connected to first mixture induction means operative to supply each of said first set of cylinders with a combustible mixture leaner than a stoichiometric mixture, a second set of cylinders connected to second mixture induction means operative to supply each of said second set of cylinders with a combustible mixture richer than the stoichiometric mixture, an exhaust system including exhaust re-combustion means for re-combusting the mixture of the exhaust gases from the first and second sets of cylinders, and a spark-ignition system comprising first and second ignition units respectively connected with said first and second sets of cylinders, wherein the first ignition unit is arranged to provide spark-advance characteristics enabling each of the first set of cylinders to produce a power output approximating maximum power output of the cylinder and the second ignition unit is arranged to provide spark-advance characteristics producing ignition timing retarded from ignition timing dictated by spark-advance characteristics which will provide maximum power output of each of the second set of cylinders.
0 Assignments
0 Petitions
Accused Products
Abstract
A spark-igniton multiple-cylinder internal combustion engine for an automotive vehicle, having a first set of cylinders to operate on a relatively lean air-fuel mixture and a second set of cylinders to operate on a relatively rich air-fuel mixture, wherein improvement is made so that the power outputs of each of the first set of cylinders and each of the second set of cylinders are substantially equalized with or at least made closer to each other.
28 Citations
14 Claims
- 1. A spark-ignition multiple-cylinder internal combustion engine having a first set of cylinders connected to first mixture induction means operative to supply each of said first set of cylinders with a combustible mixture leaner than a stoichiometric mixture, a second set of cylinders connected to second mixture induction means operative to supply each of said second set of cylinders with a combustible mixture richer than the stoichiometric mixture, an exhaust system including exhaust re-combustion means for re-combusting the mixture of the exhaust gases from the first and second sets of cylinders, and a spark-ignition system comprising first and second ignition units respectively connected with said first and second sets of cylinders, wherein the first ignition unit is arranged to provide spark-advance characteristics enabling each of the first set of cylinders to produce a power output approximating maximum power output of the cylinder and the second ignition unit is arranged to provide spark-advance characteristics producing ignition timing retarded from ignition timing dictated by spark-advance characteristics which will provide maximum power output of each of the second set of cylinders.
-
14. A spark-ignition multiple-cylinder internal combustion engine having a first set of cylinders connected to first mixture induction means operative to supply each of said first set of cylinders with a combustible mixture leaner than a stoichiometric mixture, a second set of cylinders connected to second mixture induction means operative to supply each of said second set of cylinders with a combustible mixture richer than the stoichiometric mixture, an exhaust system including exhaust re-combustion means for re-combusting the mixture of the exhaust gases from the first and second sets of cylinders, and a spark-ignition system comprising first and second ignition units which are respectively connected with said first and second sets of cylinders, wherein said first and second sets of cylinders are constructed and arranged in such a manner that each of the first sets of cylinders has a bottom-dead-center volume larger than and a compression ratio higher than those of each of said second set of cylinders and wherein said first ignition unit is arranged to provide spark-advance characteristics enabling each of the first set of cylinders to produce a power output approximating maximum power output of the cylinder and said second ignition unit is arranged to provide spark-advance characteristics producing ignition timing which is retarded from the ignition timing dictated by spark-advance characteristics which will provide maximum power output of each of said second set of cylinders.
Specification