Internal-combustion engines – Multiple cylinder
Patent
1985-01-22
1986-06-03
Cross, E. Rollins
Internal-combustion engines
Multiple cylinder
123432, 123 9015, 123 9017, 123190A, F02B 7518
Patent
active
045923108
ABSTRACT:
An intake device for an internal combustion engine is provided with an intake passage-length change mechanism for changing the effective length of the intake passage for each cylinder, and a valve timing change mechanism for changing the closure timing of the intake valve for each cylinder. The intake passage-length change mechanism is actuated, in a particular engine speed range, to change the effective length of the intake passage according to the engine speed so that the natural frequency of the intake system is tuned with the frequency of the pressure change in the intake passage which is determined by the engine speed, thereby enhancing the intake inertia effect to improve the engine output power. In the particular engine speed range, the valve timing change mechanism is actuated to make better use of the inertia effect enhanced by the intake passage-length change mechanism. Outside the particular engine speed range, the valve timing change mechanism is actuated to change the intake valve closure timing so that the volumetric efficiency is improved according to the engine speed.
REFERENCES:
patent: 2835235 (1958-05-01), Gassmann
patent: 3897760 (1975-08-01), Hisserich
patent: 4438737 (1984-03-01), Burandt
Hitomi Mitsuo
Sasaki Junzo
Ueda Kazuhiko
Cross E. Rollins
Ferguson Jr. Gerald J.
Mazda Motor Corporation
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