| 主权项 |
1. A variable cylinder engine, comprising:
an engine body having a plurality of cylinders; a cooling mechanism for cooling the engine body; and a controller for controlling the cooling mechanism and changing a number of active cylinders according to an operating state of the engine, for determining an engine load and an engine speed based on an engine speed sensor, an airflow sensor, and an accelerator sensor, and for controlling injectors, ignition plugs, and valve stopping mechanism parts to deactivate the active cylinders, wherein the controller reduces the number of the active cylinders in a reduced-cylinder operating range set within a partial engine load range, the partial engine load range having a lower engine load than a high-load all-cylinder operating range, dividing the reduced-cylinder operating range into a first reduced-cylinder operating range set within a high load part and a second reduced-cylinder operating range set within a low load part, and in the first reduced-cylinder range set within the high load part of the reduced-cylinder operating range, the controller improves a cooling performance of the cooling mechanism, compared with that in the second reduced-cylinder range set within the low load part of the reduced-cylinder operating range, by reducing a reference temperature above which the cooling mechanism is configured to flow coolant to cool the active cylinders. |
