System for vaporizing air-fuel mixture supplied to cylinders of an internal combustion engine for a motor vehicle

Claim 1

A system for vaporizing air-fuel mixtures supplied to cylinders of an internal combustion engine for a motor vehicle, the internal combustion engine having means for supplying the air-fuel mixtures, each of the cylinders being provided with an intake valve and an exhaust valve, which system cmprises, an intake manifold communicating with said air-fuel mixture supply means and communicable with said cylinders via said intake valves for distributing said mixtures to said cylinders, an exhaust manifold havibg a first set of exhaust branch passages communicable with predetermined cylinders selected from said cylinders via the exhaust valves thereof and a second set of exhaust branch passages communicable with the remaining cylinders via the exhaust valves thereof, said first and second sets of exhaust branch passages being communicable with the atmospheric air, means for raising the temperature of the exhaust gases flowing through said first set of exhaust branch passages and comprising a first means for providing normal ignition timing to said remaining cylinders and a second means for providing retarded ignition timing to said predetermined cylinders when said engine is running below a predetermined speed, said first means including a DC power source, a first ignition coil having a primary winding and a secondary winding, said primary winding being connected at one terminal thereof with said DC power source and said secondary winding being connected at one terminal thereof selectively with the ignition plugs of said remaining cylinders and a first ignition distributor having an interruptor connected to the other terminals of said first and secondary windings, said first ignition distributor being arranged to provide normal ignition timing, and said second means including a second ignition coil having a primary winding and a secondary winding, said primary winding of said second ignition coil being connected at one terminal thereof with said DC power source and said secondary winding of said second ignition coil being connected at one terminal thereof selectively with ignition plugs of said predetermined cylinders and a second ignition distributor having an interruptor being connected to the other terminals of said first and secondary windings of said second ignition coil, said second ignition distributor being arranged to provide retarded ignition timing when said engine is running below said predetermined speed and to provide normal ignition timing when saiD engine is running above said predetermined speed.

Claim 2

A system for vaporizing air-fuel mixtures supplied to cylinders of an internal combustion engine for a motor vehicle, the internal combustion engine having means for supplying the air-fuel mixtures, each of the cylinders being provided with an intake valve and an exhaust valve, which system cmprises, an intake manifold communicating with said air-fuel mixture supply means and communicable with said cylinders via said intake valves for distributing said mixtures to said cylinders, an exhaust manifold havibg a first set of exhaust branch passages communicable with predetermined cylinders selected from said cylinders via the exhaust valves thereof and a second set of exhaust branch passages communicable with the remaining cylinders via the exhaust valves thereof, said first and second sets of exhaust branch passages being communicable with the atmospheric air, means for raising the temperature of the exhaust gases flowing through said first set of exhaust branch passages and comprising a first means for providing normal ignition timing to said remaining cylinders and a second means for providing retarded ignition timing to said predetermined cylinders when said engine is running below a predetermined speed, said first means including a DC power source, a first ignition coil having a primary winding and a secondary winding, said primary winding being connected at one terminal thereof with said DC power source and said secondary winding being connected at one terminal thereof selectively with the ignition plugs of said remaining cylinders and a first ignition distributor having an interruptor connected to the other terminals of said first and secondary windings, said first ignition distributor being arranged to provide normal ignition timing, and said second means including a second ignition coil having a primary winding and a secondary winding, said primary winding of said second ignition coil being connected at one terminal thereof with said DC power source and said secondary winding of said second ignition coil being connected at one terminal thereof selectively with ignition plugs of said predetermined cylinders and a second ignition distributor having an interruptor being connected to the other terminals of said first and secondary windings of said second ignition coil, said second ignition distributor being arranged to provide retarded ignition timing when said engine is running below said predetermined speed and to provide normal ignition timing when saiD engine is running above said predetermined speed.