Air intake system for a fuel-injection engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTakao Fukuma, Hiroshi Okano
Life of this patent
Estimating the term…
Abstract
An air intake system for a fuel injection engine having cylinders equipped with a swirl port and a conventional straight port. The air intake system comprises a swirl control valve for opening or closing the inlet air passage to the straight port, and further comprises an adapter piece installed in the division wall separating the inlet air passages into the swirl port and the straight port. An aperture communicating both inlet air passages is formed in the adapter piece, and the size thereof is optimized in consideration of the size of an air induction hole disposed in the swirl control valve, to thereby obtain a larger operation area of the air fuel ratio of the lean air fuel mixture supplied to the engine.
Claims22
An air int system for an engine having cylinders equipped with a conventional straight inlet port and a swirl inlet port generating a swirl in inlet air flowing therethrough in the cylinder, said system, comprising:
- a first inlet air passage connected to said swirl inlet port;
- a second inlet air passage connected to said straight inlet port;
- a division wall formed between and separating said first and second inlet air passages;
- a swirl control valve installed in said second inlet air passage, and blocking said second inlet air passages when the engine is operated at predetermined load condition, so that a major portion of the inlet air flows into the cylinder through the first inlet air passages and the swirl port;
- a fuel injector disposed between said first and second inlet air passages and injecting fuel into both of said first and second inlet air passages;
- and
- an adaptor piece installed in the division wall at a position downstream of the swirl control valve and having a portion thereof forming a part of said division wall, said adapter piece comprising an installation seat for receiving the fuel injector, fuel injection passages for injecting fuel therethrough to the first and second inlet air passages, and an aperture formed in said portion forming a part of the division wall at the outlet of said fuel injection passages, for communicating the first and the second inlet air passages.
An air intake system for an engine having cylinders equipped with a conventional straight inlet port and a swirl inlet port generating a swirl of the inlet air therethrough in the cylinder, said system comprising:
- a first inlet air passage connected to said swirl inlet port;
- a second inlet air passage connected to said straight inlet port;
- a division wall formed between, and separating said first and second inlet air passages;
- a swirl control valve having a plate type valve element and installed in said second inlet air passage and blocking said second inlet air passage when the engine is operated at predetermined load condition, so that a major portion of the inlet air flows into the cylinder through the first inlet air passage and the swirl port;
- a fuel injector disposed between said first and second inlet air passages for injecting fuel into both inlet air passages downstream of the swirl control valves, through fuel injection passages formed in the division wall;
- an aperture disposed in the division wall near to the outlets of the fuel injection passages, and communicating said first and second inlet air passages;
- and
- an air induction hole formed in said valve element of the swirl control valve for introducing a portion of the inlet air to said second inlet air passage when the second inlet air passage is blocked by said valve element, said air induction hole being disposed at the upper half side of the valve element of the swirl control valve.
An air intake system for an engine having cylinders equipped with a conventional straight inlet port and a swirl inlet port generating a swirl of inlet air therethrough in the cylinder, said system comprising:
- a first inlet air passage connected to said swirl inlet port;
- a second inlet air passage connected to said straight inlet port;
- a division wall formed between, and separating said first and second inlet air passages;
- a swirl control valve having a plate type valve element and installed in said second inlet air passage and blocking said second inlet air passages when the engine is operated at predetermined load condition, so that a major portion of the inlet air flows into the cylinder through the first inlet air passages and the swirl port;
- a fuel injector disposed between said first and second inlet air passages for injecting fuel into both inlet air passages downstream of the swirl control valves through fuel injection passages formed in the division wall;
- an aperture disposed in the division wall near to the outlets of the fuel injection passages and communicating said first and second inlet air passages;
- and
- air induction hole formed in said valve element of the swirl control valve for introducing a portion of the inlet air to said second inlet air passage when the second inlet air passage is blocked by said valve element;
- and, a total of the area of said aperture of the division wall and the area of said air induction hole of the swirl control valve is approximately 25% of the area of the cross section of said second inlet air passage.
Dependencies are inferred from the claim text.