Direct injection engine system and method
First Claim
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1. A method for controlling an engine during a cylinder air/fuel ratio change from a first cylinder air/fuel ratio to a second cylinder air/fuel ratio, the method comprising the steps of:
- determining a first number of cylinders to enable to perform combustion so that the cylinder air/fuel ratio change can occur without a disturbance in engine torque; and
enabling said first number of cylinders and changing the cylinder air/fuel from the first cylinder air/fuel ratio to the second cylinder air/fuel ratio when said number of cylinders are currently disabled.
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Abstract
A method for controlling mode transitions, such as from stratified to homogeneous mode, in a direct injection engine adjusts a number of cylinders carrying out combustion to prevent engine torque disturbances. Cylinder activation is used when changes in cylinder air/fuel ratio cannot be compensated using ignition timing adjustments. In addition, the number of cylinders to activate is also determined and measures are taken if the number of cylinders determined are not available to be activated.
112 Citations
20 Claims
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1. A method for controlling an engine during a cylinder air/fuel ratio change from a first cylinder air/fuel ratio to a second cylinder air/fuel ratio, the method comprising the steps of:
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determining a first number of cylinders to enable to perform combustion so that the cylinder air/fuel ratio change can occur without a disturbance in engine torque; and
enabling said first number of cylinders and changing the cylinder air/fuel from the first cylinder air/fuel ratio to the second cylinder air/fuel ratio when said number of cylinders are currently disabled. - View Dependent Claims (2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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5. The method recited in 4 wherein said third air/fuel ratio is further based on said second number of cylinder.
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15. A method for controlling an engine during a mode transition from homogeneous operation to stratified operation, wherein a cylinder air/fuel ratio changes from a first cylinder air/fuel ratio to a second cylinder air/fuel ratio, the method comprising the steps of:
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determining a first number of cylinders to enable to perform combustion so that the cylinder air/fuel ratio change can occur without a disturbance in engine torque; and
enabling said first number of cylinders and changing the operating mode from homogeneous mode to stratified mode when said number of cylinders are currently disabled, said enabling step further comprising changing cylinder air/fuel from the first cylinder air/fuel ratio to the second cylinder air/fuel ratio;
disabling a second number of cylinders and changing the cylinder air/fuel ratio from the first cylinder air/fuel ratio to a third homogeneous cylinder air/fuel ratio otherwise. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification