Internal combustion engine intake system having auxiliary passage bypassing main throttle to produce swirl in intake port
First Claim
1. In an intake system of an internal combustion engine, having an induction passage, an intake port as an endmost portion of the induction passage adjoining a combustion chamber of the engine, a main throttle valve installed in the induction passage upstream of said intake port, an intake valve for periodically providing communication of the intake port with the combustion chamber according to the engine cycle, and means for introducing fuel into the induction passage through a fuel nozzle opening into the induction passage at a section upstream of the intake port, the improvement comprising an auxiliary induction passage which has a smaller cross-sectional area than said induction passage and is arranged to bypass said main throttle valve and extend to said intake port, an endmost portion of said auxiliary induction passage taking the form of a conduit which extends in said intake port such generally circumferentially of said intake port and has an open end so shaped as to constitute a nozzle opening into said intake port in a direction generally circumferentially of said intake port such that a gas injected from said nozzle makes a swirling flow in said intake port.
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Accused Products
Abstract
An auxiliary passage of a relatively small cross-sectional area bypasses the main throttle valve of a usual induction passage to extend to each intake port. The auxiliary passage allows air or an air-fuel mixture to pass therethrough according to the magnitude of vacuum in the intake port and, in its endmost portion, takes the form of a nozzle directioned circumferentially of the intake port, so that the air-fuel mixture flowing in the intake port is agitated to thorough homogenization by a swirling movement of the injected gas particularly efficiently during low load operation of the engine.
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Citations
14 Claims
- 1. In an intake system of an internal combustion engine, having an induction passage, an intake port as an endmost portion of the induction passage adjoining a combustion chamber of the engine, a main throttle valve installed in the induction passage upstream of said intake port, an intake valve for periodically providing communication of the intake port with the combustion chamber according to the engine cycle, and means for introducing fuel into the induction passage through a fuel nozzle opening into the induction passage at a section upstream of the intake port, the improvement comprising an auxiliary induction passage which has a smaller cross-sectional area than said induction passage and is arranged to bypass said main throttle valve and extend to said intake port, an endmost portion of said auxiliary induction passage taking the form of a conduit which extends in said intake port such generally circumferentially of said intake port and has an open end so shaped as to constitute a nozzle opening into said intake port in a direction generally circumferentially of said intake port such that a gas injected from said nozzle makes a swirling flow in said intake port.
Specification