Patent Number: 6,332,446

Title: Internal combustion engine having solenoid-operated valves and control method

Abstract: An internal combustion engine including solenoid-operated intake and exhaust valves is operable in a partial operating mode with at least one cylinder being deactivated, without suffering from vibration of the engine. Where particular cylinders are deactivated under cylinder deactivation control, the exhaust valve of each deactivated or inactive cylinder is opened for a certain period of time which starts ahead of the bottom dead center. The timing of opening the exhaust valve is determined so that the pressure within the inactive cylinder is lower than the atmospheric pressure when the exhaust valve is opened. The timing of closing the exhaust valve is determined so that the peak value of the pressure within the inactive cylinder becomes almost equal to the peak value of the pressure within active cylinders. Where the cylinders are successively deactivated with the engine operating on a six-stroke cycle, opening and closing actions of the exhaust valve are controlled so that an increase in the cylinder pressure due to compression of gas in the currently deactivated cylinder and an increase in the cylinder pressure due to combustion in an active cylinder do not occur at the same time.

Inventors: Matsumoto; Isao (Susono, JP), Nishida; Hideyuki (Susono, JP)

Assignee: Toyota Jidosha Kabushiki Kaisha

International Classification: F02D 17/02 (20060101); F01L 9/04 (20060101); F02D 17/00 (20060101); F02D 41/36 (20060101); F02D 13/06 (20060101); F02D 41/32 (20060101); F02B 75/02 (20060101); F02B 077/00 ()

Expiration Date: 12/25/2018