Variable valve type internal combustion engine and control method thereof
First Claim
1. A variable valve type internal combustion engine in which the intake airflow is controlled with a plurality of intake valves, comprising a plurality of intake ports provided in each cylinder, an intake valve which individually opens and shuts each intake port, a variable valve gear which continuously and changeably sets at least one of the lift amount and the open valve period of each intake valve, and a control means in which at least one of the lift amount and the open valve period of plural intake valves can be set independently for each intake valve, and the operation modes of said plural intake valves in one cylinder can be set respectively and independently according to the operating states of the internal combustion engine,wherein said control means stops at least one of said plural intake valves provided in one cylinder in a low air amount region and operates at least one other of said plural intake valves in the low air amount region, and at least two of the plural intake valves are operated in medium and high air amount regions.
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Accused Products
Abstract
The operation modes of plural intake valves 7a and 7b provided in one cylinder is independently changed according to the drive region of the internal combustion engine. In the low air amount region, the intake airflow is controlled only with intake valve 7a which operates in the low air amount region and the other intake valve 7b is operated in the medium and high air amount regions.
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Citations
16 Claims
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1. A variable valve type internal combustion engine in which the intake airflow is controlled with a plurality of intake valves, comprising a plurality of intake ports provided in each cylinder, an intake valve which individually opens and shuts each intake port, a variable valve gear which continuously and changeably sets at least one of the lift amount and the open valve period of each intake valve, and a control means in which at least one of the lift amount and the open valve period of plural intake valves can be set independently for each intake valve, and the operation modes of said plural intake valves in one cylinder can be set respectively and independently according to the operating states of the internal combustion engine,
wherein said control means stops at least one of said plural intake valves provided in one cylinder in a low air amount region and operates at least one other of said plural intake valves in the low air amount region, and at least two of the plural intake valves are operated in medium and high air amount regions.
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14. A method of controlling a variable valve type internal combustion engine in which the intake airflow is controlled with a plurality of intake valves, comprising a plurality of intake ports provided in each cylinder, an intake valve which individually opens and shuts each intake port, and a variable valve gear which continuously and changeably sets at least one of the lift amount and the open valve period of each of the intake valves, wherein at least one of said plural intake valves provided in one cylinder is stopped in a low air amount region and at least one of said plural intake valves is operated in the low air amount region, and at least two of the plural intake valves are operated in medium and high air amount regions.
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15. A variable valve type internal combustion engine in which the intake airflow is controlled with a plurality of intake valves, comprising a plurality of intake ports provided in each cylinder, an intake valve which individually opens and shuts each intake port, and a variable valve gear which continuously and changeably sets at least one of the lift amount and the open valve period of each intake valve, further comprising a controller in which at least one of the lift amount and the open valve period of plural intake valves can be set independently for each intake valve, and the operation modes of said plural intake valves in one cylinder can be set respectively and independently according to the operating states of the internal combustion engine, further comprising
a negative pressure generator which generates a negative pressure upstream of the intake valve in the low air amount region, wherein the control of the intake airflow in the low air amount region is performed by using one intake valve among said plural intake valves provided in one cylinder.
Specification