Cylinder-disabling control system for multi-cylinder engine
First Claim
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1. A cylinder-disabling control system for a multi-cylinder engine provided with an exhaust manifold to which each exhaust port is connected, said control system comprising:
- an engine performance sensor for sensing the engine performance;
an operation mode selector for selecting either a cylinder-disabling mode in which at least one but not all of the cylinders are disabled, or an all-cylinders-engaged mode in which all of the cylinders are operated, depending on the engine performance; and
a disabled-cylinder designator for designating as disabled at least one of;
the most upstream cylinder, which is a cylinder located most upstream in the direction of exhaust gas flow, and the exhaust pulse-affected downstream cylinder, which is a cylinder receiving exhaust pulse from said most upstream cylinder, when the cylinder-disabling mode is selected.
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Abstract
A cylinder-disabling control system for a multi-cylinder engine provided with an exhaust manifold to which each exhaust port is connected, which control system comprises: an engine performance sensor; an operation mode selector for selecting the cylinder-disabling mode or the all-cylinders-engaged mode; and a disabled-cylinder designator for designating as disabled at least one of the most upstream cylinder and the exhaust pulse-affected downstream cylinder, when the cylinder-disabling mode is selected, thereby improving driving stability at low rpm'"'"'s.
12 Citations
14 Claims
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1. A cylinder-disabling control system for a multi-cylinder engine provided with an exhaust manifold to which each exhaust port is connected, said control system comprising:
- an engine performance sensor for sensing the engine performance;
an operation mode selector for selecting either a cylinder-disabling mode in which at least one but not all of the cylinders are disabled, or an all-cylinders-engaged mode in which all of the cylinders are operated, depending on the engine performance; and
a disabled-cylinder designator for designating as disabled at least one of;
the most upstream cylinder, which is a cylinder located most upstream in the direction of exhaust gas flow, and the exhaust pulse-affected downstream cylinder, which is a cylinder receiving exhaust pulse from said most upstream cylinder, when the cylinder-disabling mode is selected. - View Dependent Claims (2)
- an engine performance sensor for sensing the engine performance;
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3. A cylinder-disabling control system for a multi-cylinder engine provided with an exhaust manifold to which each exhaust port is connected, said control system comprising:
- an engine performance sensor for sensing the engine performance;
an operation mode selector for selecting either a cylinder-disabling mode in which at least one but not all of the cylinders are disabled, or an all-cylinders-engaged mode in which all of the cylinders are operated, depending on the engine performance; and
a fuel/air ratio detecting means for detecting the fuel/air ration in the operating cylinder(s) while in the cylinder-disabling mode.
- an engine performance sensor for sensing the engine performance;
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4. A cylinder-disabling control system for a multi-cylinder engine provided with an exhaust manifold to which each exhaust port is connected, said control system comprising:
- an engine performance sensor for sensing the engine performance;
an operation mode selector for selecting either a cylinder-disabling mode in which at least one but not all of the cylinders are disabled, or an all-cylinders-engaged mode in which all of the cylinders are operated, depending on the engine performance; and
a controller for controlling the fuel injection volume and the ignition timing in the cylinders, said controller including a first control map for setting the fuel injection volume and the ignition timing for each cylinder in the all-cylinder-engaged mode, and a second control map for setting the fuel injection volume and the ignition timing for each cylinder when the cylinder-disabling mode is selected. - View Dependent Claims (5, 6, 7)
- an engine performance sensor for sensing the engine performance;
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8. A method for cylinder-disabling control for a multi-cylinder engine provided with an exhaust manifold to which each exhaust port is connected, said method comprising the steps of:
- sensing the engine performance;
selecting either a cylinder-disabling mode in which at least one but not all of the cylinders are disabled, or an all-cylinders-engaged mode in which all of the cylinders are operated, depending on the engine performance; and
detecting the fuel/air ration in the operating cylinder(s) while in the cylinder-disabling mode.
- sensing the engine performance;
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9. A method for cylinder-disabling control for a multi-cylinder engine provided with an exhaust manifold to which each exhaust port is connected, said method comprising the steps of:
- sensing the engine performance;
selecting either a cylinder-disabling mode in which at least one but not all of the cylinders are disabled, or an all-cylinders-engaged mode in which all of the cylinders are operated, depending on the engine performance; and
designating as disabled at least one of the most upstream cylinder, which is a cylinder located most upstream in the direction of exhaust gas flow, and the exhaust pulse-affected downstream cylinder, which is a cylinder receiving exhaust pulse from said most upstream cylinder, when the cylinder-disabling mode is selected. - View Dependent Claims (10)
- sensing the engine performance;
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11. A method for cylinder-disabling control for a multi-cylinder engine provided with an exhaust manifold to which each exhaust port is connected, said method comprising the steps of:
- sensing the engine performance;
selecting either a cylinder-disabling mode in which at least one but not all of the cylinders are disabled, or an all-cylinders-engaged mode in which all of the cylinders are operated, depending on the engine performance; and
controlling the fuel injection volume and the ignition timing in the cylinders, based on a first control map for setting the fuel injection volume and the ignition timing for each cylinder in the all-cylinder-engaged mode, and a second control map for setting the fuel injection volume and the ignition timing for each cylinder when the cylinder-disabling mode is selected. - View Dependent Claims (12, 13, 14)
- sensing the engine performance;
Specification