ENGINE DESIGNED TO BE CAPABLE OF CHANGING THE NUMBER OF CYLINDERS TO BE OPERATED

摘要

PURPOSE:To prevent knocking of an engine which is designed to be capable of changing the number of cylinders to be operated, by providing a means for detecting the temperature of intake air, and making the engine operate with all of its cylinders when the temperature of intake air becomes higher than a prescribed value. CONSTITUTION:A sensor 30 for detecting the temperature of intake air is attached to an intake passage 8 of an engine 1 which is designed to be capable of changing the number of cylinders to be operated. A control unit 28 selects the number of cylinders to be operated according to various operational conditions of the engine and switches the operation mode of the engine to full-cylinder operation forcibly when the temperature of intake air becomes higher than a prescribed value. With such an arrangement, it is enabled to avoid partial-cylinder operation having high tendency to cause knocking.