Valve timing control system for internal combustion engine
A valve timing control system is described for an internal combustion engine having at least one cylinder, the cylinder defining a combustion chamber of the engine, comprising: a pair of intake ports communicating with the combustion chamber and a pair of intake valve provided for each cylinder which open and close respective intake ports; valve operating means for opening and closing the intake valves in a timed relation in synchronization with rotation of the engine, an opening period of each intake valve being kept substantially constant; and a valve timing changing means of controlling opening and closing timing of one of the intake valves for each cylinder by shifting the opening timing and closing timing of one intake valve in the same direction with the opening timing and closing timing of the other intake valve being fixed without substantially changing the opening period of the valves. This is done so that the opening timing and closing timing of one of the intake valves are retarded with the total intake valve opening period being relatively elongated during operation of the engine at high speed under heavy load as compared with that during operation of the engine at low speed under heavy load so as to prevent back flow when the intake valve are closed, thereby improving the volumetric efficiency.
- Assignee:
- Mazda Motor Corp., Hiroshima
- Patent Number(s):
- US 4651684
- OSTI ID:
- 6652572
- Resource Relation:
- Patent File Date: Filed date 9 Sep 1983
- Country of Publication:
- United States
- Language:
- English
Similar Records
Internal combustion engine
Internal combustion engine
Related Subjects
INTERNAL COMBUSTION ENGINES
CONTROL SYSTEMS
VALVES
COMBUSTION CHAMBERS
CYLINDERS
EFFICIENCY
INTAKE STRUCTURES
ROTATION
SYNCHRONIZATION
TIMING CIRCUITS
VELOCITY
CONTROL EQUIPMENT
ELECTRONIC CIRCUITS
ENGINES
EQUIPMENT
FLOW REGULATORS
HEAT ENGINES
MECHANICAL STRUCTURES
MOTION
330100* - Internal Combustion Engines