Internal-combustion engines – Charge forming device – Supercharger
Patent
1989-01-19
1991-03-05
Koczo, Michael
Internal-combustion engines
Charge forming device
Supercharger
123564, F02B 3338, F02D 2300
Patent
active
049969668
ABSTRACT:
An engine is provided with a mechanical supercharger which is disposed in an intake passage of the engine and is driven by the output power of the engine. The supercharger is connected to and disconnected from the output power of the engine by a clutch. The engine has intake and exhaust valves which are opened and closed with an overlap time. A valve timing changing mechanism changes the overlap time in order to change the amount of air communicated between the intake and exhaust ports. A controller controls the valve timing changing mechanism and the clutch so that the amount of air communicated between the intake and exhaust ports is reduced and the supercharger is disconnected from the output power of the engine and does not operate when the operating condition of the engine is in a first operational range in which the amount of intake air is not more than a first preset value, the former is increased and the latter is connected with the output power of the engine so as to operate when the operating condition of the engine is in a second operational range in which the amount of intake air is not less than a second preset value which is larger than the first preset value, and the former is increased and the latter is disconnected from the output power of the engine when the operating condition of the engine is in a third operational range in which the amount of intake air is between the first and second preset values.
REFERENCES:
patent: 4708119 (1987-11-01), Miyake
patent: 4730593 (1988-03-01), Regar
Fujimoto Hidefumi
Hitomi Mitsuo
Nishikawa Toshio
Sasaki Junso
Yamashita Akinori
Koczo Michael
Mazda Motor Corporation
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