Intake system of an internal combustion engine

Patent · Tue Jul 08 04:00:00 EDT 1986

OSTI ID:5504132

Kobayashi, N; Ito, T

An internal combustion engine is described which consist of: an intake passage; a swirl control valve arranged in the intake passage for creating a swirl motion in a combustion chamber when the swirl control valve is closed; an actuator having a vacuum chamber isolated from the outside air by a diaphragm which is connected to the swirl control valve, the actuator closing the swirl control valve when the level of vacuum in the vacuum chamber becomes greater than a predetermined level; valve means arranged between the intake passage and the vacuum chamber for confining vacuum in the vacuum chamber to close the swirl control valve when the engine is operating at a low speed, the valve means causing the vacuum chamber to open to the outside air for opening the swirl control valve when the engine is operating at a high speed; fuel supply means arranged in the intake passage for forming a lean air-fuel mixture therein; a vacuum sensor arranged in the intake passage for detecting the absolute pressure therein; means for calculating an elapsed time after the absolute pressure exceeds a predetermined pressure under a state where the engine is operating at a low speed; and control means controlling the valve means and the fuel supply means for causing the vacuum chamber to open to the outside air to open the swirl control valve and for changing an air-fuel mixture formed by the fuel supply means to an air-fuel mixture of an approximately stoichiometric air-fuel ratio from a lean air-fuel mixture when the elapsed time exceeds a predetermined time.

• Assignee: Toyota Jidosha Kabushiki Kaisha, Toyota
• Patent Number(s): US 4598678
• OSTI ID: 5504132
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
ACTUATORS
AIR FLOW
COMBUSTION CHAMBERS
COMPUTERIZED CONTROL SYSTEMS
CONTROL EQUIPMENT
CONTROL SYSTEMS
ENGINES
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
FUEL-AIR RATIO
GAS FLOW
HEAT ENGINES
INTAKE STRUCTURES
INTERNAL COMBUSTION ENGINES
MECHANICAL STRUCTURES
PRESSURE EFFECTS
PRESSURE MEASUREMENT
TIME MEASUREMENT
VACUUM SYSTEMS
VALVES
VELOCITY
VORTEX FLOW