System and method for performing partial cylinder cut-off of internal combustion engine
First Claim
1. A system for performing partial cylinder cut-off of an internal combustion engine, comprising:
- a rocker arm including first and second arms selectively operable jointly or independently;
a rocker arm connecting unit selectively joining said first and second arms for joint operation;
a separation-preventing unit interposed between the rocker arm and the rocker arm connecting unit, the separation-preventing unit preventing separation of the rocker arm from the rocker arm connecting unit; and
a hydraulic pressure supply to supply and exhaust hydraulic pressure to and from the rocker arm connecting unit wherein supplied pressure activates said connecting unit for said joint operation.
1 Assignment
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Accused Products
Abstract
A system and method for performing partial cylinder cut-off of an internal combustion engine is provided, the system including a rocker arm including first and second arms that are selectively joined together; a rocker arm connecting unit operated by hydraulic pressure and which performs the operation of selectively joining the first and second arms of the rocker arm; a separation-preventing unit interposed between the rocker arm and the rocker arm connecting unit, the separation-preventing unit preventing the separation of the rocker arm from the rocker arm connecting unit; and a hydraulic pressure supply unit controlled by an electronic control unit to supply and exhaust hydraulic pressure to and from the rocker arm connecting unit, the electronic control unit performing control of the hydraulic pressure supply unit according to comparisons made between received signals of vehicle state and pre-installed data.
27 Citations
18 Claims
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1. A system for performing partial cylinder cut-off of an internal combustion engine, comprising:
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a rocker arm including first and second arms selectively operable jointly or independently;
a rocker arm connecting unit selectively joining said first and second arms for joint operation;
a separation-preventing unit interposed between the rocker arm and the rocker arm connecting unit, the separation-preventing unit preventing separation of the rocker arm from the rocker arm connecting unit; and
a hydraulic pressure supply to supply and exhaust hydraulic pressure to and from the rocker arm connecting unit wherein supplied pressure activates said connecting unit for said joint operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for performing partial cylinder cut-off of an internal combustion engine comprising:
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determining if cut-off conditions are satisfied; and
discontinuing opening and closing of intake and exhaust valves for a predetermined number of cylinders if the cut-off conditions are satisfied. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for performing partial cylinder cut-off of an internal combustion engine comprising:
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determining if a time that a transmission is in neutral exceeds a first predetermined time;
determining if a vehicle speed is 0 if the time that the transmission is in neutral exceeds the first predetermined time;
discontinuing the operation of intake and exhaust valves for a first predetermined number of cylinders if the vehicle speed is 0;
determining if an accelerator pedal is controlled to on in a state where the operation of the intake and exhaust valves for the first predetermined number of cylinders is discontinued, reactivating the operation of the intake and exhaust valves for the first predetermined number of cylinders if the accelerator pedal is controlled to on, and returning to discontinuing the operation of the intake and exhaust valves for the first predetermined number of cylinders if the accelerator pedal is not controlled to on;
determining if the accelerator pedal is controlled to on if the time that the transmission is in neutral does not exceed the first predetermined time;
determining if a time that the accelerator pedal is in an off state exceeds a second predetermined time and if a change in vehicle speed is less than 0, in the case where the accelerator pedal is not controlled to on;
discontinuing operation of intake and exhaust valves for a second predetermined number of cylinders if the time that the accelerator pedal is in an off state exceeds the second predetermined time and if the change in vehicle speed is less than 0;
determining if the accelerator pedal is controlled to on in a state where the operation of the intake and exhaust valve for the second predetermined number of cylinders is discontinued, and reactivating the operation of the intake and exhaust valves for the second predetermined number of cylinders if the accelerator pedal is controlled to on; and
determining that the vehicle speed is 0 if the accelerator pedal is not controlled to on, returning to discontinuing the operation of the intake and exhaust valves for the first predetermined number of cylinders if the vehicle speed is 0, and returning to discontinuing the operation of the intake and exhaust valves for the second predetermined number of cylinders if the vehicle speed is not 0.
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Specification