Engine induction system
AssigneeMazda Motor Corporation
InventorsMitsuo Hitomi, Tadashi Nakagawa, Kiyotaka Mamiya, Takayoshi Hayashi, Tadayoshi Kaide
Life of this patent
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Abstract
An engine induction system includes intake passages connected to inlet ports of an engine, an injector provided in the intake passage for injecting fuel in an intake plenum between the injector and the inlet port, the injector being disposed in such a position that the volume of the intake plenum is greater than the predetermined stroke volume. This ensures improved vaporization and atomization of fuel and mixing of fuel and air, and improves the combustibility and increases the charging efficiency of use of latent heat of vaporization.
Claims24
An induction system for use in an engine including a cylinder having an inlet port and a predetermined stroke volume comprising:
- an intake passage connected to the inlet port;
- an injector provided in the intake passage for injecting fuel in an intake plenum between the injector and the inlet port, the injector being disposed in such a position that the volume of the intake plenum is greater than the predetermined stroke volume.
An induction system for use in an engine including a cylinder having an inlet port and a predetermined stroke volume comprising:
- an intake passage connected to the inlet port;
- an upstream injector provided in the intake passage for injecting fuel in the intake plenum between the injector and the inlet port, the upstream injector being disposed in such a position that the volume of the intake plenum is greater than the predetermined stroke volume;
- and
- a downstream injector provided in the intake passage near the inlet port for injecting fuel.
An induction system for use in an engine including a plurality of cylinders having inlet ports respectively comprising:
- a plurality of intake passages connected to the respective inlet ports;
- a common intake passage to which upstream ends of the plurality of intake passages is connected equiangularly with respect to the intake direction of the common intake passage;
- an upstream injector provided in the connecting portion or upstream of the connecting portion;
- and
- a plurality of downstream injectors provided near the respective inlet ports.
An induction system for use in an engine including not more than four cylinders having inlet ports and a predetermined stroke volume comprising:
- intake passages connected to the respective inlet ports;
- a common intake passage to which upstream ends of the intake passages are connected;
- and
- an injector provided upstream of the connecting portion;
- the injector being disposed in such a position that a sum of the volume of the intake portion between the inlet port and the connecting portion and the volume of the intake portion between the connecting portion and the injector is greater than the predetermined stroke volume.
An induction system for use in an engine having more than four cylinders having inlet ports and a predetermined stroke volume comprising:
- intake passages connected to the respective inlet ports;
- a common intake passage to which upstream ends of the intake passages are connected;
- an injector provided upstream of the connecting portion, the injector being disposed in such a position that the volume of the intake portion between the inlet port and the connecting portion is greater than the predetermined stroke volume.
An induction system for use in an engine having a cylinder having an inlet port comprising:
- an intake passage connected to the inlet port, the intake passage having a linear portion and a curved portion, the linear portion having one end connected to the inlet port;
- a fuel supply tube branched from the intake passage exclusively for supplying fuel;
- and
- an injector provided in the fuel supply tube for injecting fuel;
- the fuel supply tube being so formed that the fuel injected from the injector reaches linearly the inlet port and the distance between the inlet port and the injector is greater than the maximum linear distance of the intake passage from the inlet port.
Dependencies are inferred from the claim text.