CONTROL APPARATUS FOR A CYLINDER DIRECT-INJECTION INTERNAL COMBUSTION ENGINE
First Claim
1. A control apparatus for a four stroke cylinder direct-injection internal combustion engine having a cylinder and a piston disposed within the cylinder, the control apparatus comprising:
- a variable compression ratio mechanism for variably controlling the engine compression ratio by changing the top dead center position of the piston;
a fuel injection device for injecting fuel directly into the cylinder; and
a controller for controlling the fuel injection device and the variable compression ratio mechanism;
wherein when the actual compression ratio of the internal combustion engine is higher than a target compression ratio, the controller causes the variable compression ratio mechanism to reduce the compression ratio, and in accordance with the reduction in the compression ratio the controller controls the fuel injection device to inject an intake fuel injection amount in the intake stroke and a compression fuel injection amount in the compression stroke, and retards the timing for starting the fuel injection in the compression stroke.
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Accused Products
Abstract
A control apparatus is provided for a four stroke cylinder direct-injection internal combustion engine having a cylinder and a piston disposed within the cylinder. The control apparatus includes a variable compression ratio mechanism for variably controlling the engine compression ratio by changing the top dead center position of the piston and a fuel injection device for injecting fuel directly into the cylinder. When the actual compression ratio of the engine is higher than a target compression ratio, the variable compression ratio mechanism reduces the compression ratio, and in accordance with the reduction in the compression ratio, the fuel injecting device injects an intake fuel injection amount in the intake stroke and a compression fuel injection amount in the compression stroke, and the timing for starting the fuel injection in the compression stroke is retarded.
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Citations
20 Claims
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1. A control apparatus for a four stroke cylinder direct-injection internal combustion engine having a cylinder and a piston disposed within the cylinder, the control apparatus comprising:
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a variable compression ratio mechanism for variably controlling the engine compression ratio by changing the top dead center position of the piston; a fuel injection device for injecting fuel directly into the cylinder; and a controller for controlling the fuel injection device and the variable compression ratio mechanism; wherein when the actual compression ratio of the internal combustion engine is higher than a target compression ratio, the controller causes the variable compression ratio mechanism to reduce the compression ratio, and in accordance with the reduction in the compression ratio the controller controls the fuel injection device to inject an intake fuel injection amount in the intake stroke and a compression fuel injection amount in the compression stroke, and retards the timing for starting the fuel injection in the compression stroke. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for controlling fuel injection in a four stroke cylinder direct-injection internal combustion engine having a cylinder and a piston disposed within the cylinder, the method comprising:
when the actual compression ratio of the internal combustion engine is higher than a target compression ratio, reducing the compression ratio, and in accordance with the reduction in the compression ratio injecting an intake fuel injection amount in the intake stroke and a compression fuel injection amount in the compression stroke, and retarding the timing for starting the fuel injection in the compression stroke. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A control apparatus for a four stroke cylinder direct-injection internal combustion engine having a cylinder and a piston disposed within the cylinder, the control apparatus comprising:
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variable compression ratio means for variably controlling the engine compression ratio by changing the top dead center position of the piston; fuel injection means for injecting fuel directly into the cylinder; and control means for controlling the fuel injection means and the variable compression ratio means; wherein when the actual compression ratio of the internal combustion engine is higher than a target compression ratio, the variable compression ratio means reduces the compression ratio, and in accordance with the reduction in the compression ratio the fuel injecting means injects an intake fuel injection amount in the intake stroke and a compression fuel injection amount in the compression stroke, and the control means retards the timing for starting the fuel injection in the compression stroke.
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Specification