Multicylinder engine and method for controlling the same
First Claim
1. A plurality of cylinders operable in a normal mode in which all of the cylinders are operating and a partially deactivated mode in which at least one of the cylinders is deactivated and the remaining cylinders are operating cylinders, and wherein ignition takes place in the operating cylinders at uneven intervals according to a firing order in the partially deactivated mode;
- anda control unit configured to increase an output torque of an immediately subsequent operating cylinder after the at least one deactivated cylinder in the firing order, the increased output torque maintained to be greater than an output torque of any other operating cylinder during the partially deactivated mode, in order to smooth the output torque of the operating cylinders in the partially deactivated mode.
1 Assignment
0 Petitions
Accused Products
Abstract
In some cylinder deactivation modes (e.g. virtual V-four operation mode in which two cylinders of a V-six engine are deactivated), ignition/combustion may take place in operating cylinders at uneven intervals. In this case, the output torque varies between the immediately subsequent operating cylinders after the deactivated cylinders in the firing order and the other operating cylinders. A multicylinder engine includes an ignition timing adjustment unit. When the ignition takes place in the operating cylinders at uneven intervals during cylinder deactivation, the ignition timing adjustment unit adjusts ignition timing in each of the operating cylinders to smooth the output torque of the operating cylinders.
21 Citations
12 Claims
-
1. A plurality of cylinders operable in a normal mode in which all of the cylinders are operating and a partially deactivated mode in which at least one of the cylinders is deactivated and the remaining cylinders are operating cylinders, and wherein ignition takes place in the operating cylinders at uneven intervals according to a firing order in the partially deactivated mode;
- and
a control unit configured to increase an output torque of an immediately subsequent operating cylinder after the at least one deactivated cylinder in the firing order, the increased output torque maintained to be greater than an output torque of any other operating cylinder during the partially deactivated mode, in order to smooth the output torque of the operating cylinders in the partially deactivated mode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- and
-
8. A method for controlling a multicylinder engine having a plurality of cylinders operable in a normal mode in which all of the cylinders are operating and a partially deactivated mode in which at least one of the cylinders is deactivated and the remaining cylinders are operating cylinders, said method comprising:
increasing an output torque of an immediately subsequent operating cylinder after a deactivated cylinder in a firing order undergoing ignition at uneven intervals, the increased output torque is maintained to be greater than an output torque of any other operating cylinder during the partially deactivated mode, in order to smooth the output torque of the operating cylinders. - View Dependent Claims (9, 10, 11, 12)
Specification