Internal combustion engine with turbocharger having variable compression ratio device


PURPOSE: To prevent the occurrence of sudden fluctuation in engine output torque during switching of a compression ratio, by a method wherein a variable compression ratio device is forced to perform supercharging when it is actuated on the low compression ratio side, meanwhile, it is forced to stop supercharging or widely reduce supercharging when it is actuated on the high compression ratio side. CONSTITUTION: An eccentric bearing 6 is rotatably located between a piston insertion hole 5, formed in the end part of a connecting rod 3 through which a crank shaft and a piston 2 are interconnected, a piston pin 4. Through engagement of a lock pin 8 with a lock pin engaging hole 9 formed in the eccentric bearing 6, the piston 2 is displaced to a high and a low stage, and a compression ratio is formed so that it is switchable in 2 stages of the one being a high and the other being a low stage. In this case, when a low compression ratio is selected, a vacuum switching valve 47 is opened by means of an ECU 23 and an actuator 40 is driven to close a waist gate valve situated to a turbocharger 31 to perform turbocharging. Meanwhile, when a high compression ratio is selected, control is effected so that, reversely, supercharging is stopped or reduced. COPYRIGHT: (C)1988,JPO&Japio




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Cited By (3)

    Publication numberPublication dateAssigneeTitle
    JP-5854152-B2February 09, 2016トヨタ自動車株式会社可変圧縮比機構を備える内燃機関
    US-5146879-ASeptember 15, 1992Mitsubishi Jidosha Kogyo Kabushiki KaishaVariable compression ratio apparatus for internal combustion engine
    WO-2014057534-A1April 17, 2014トヨタ自動車株式会社Moteur à combustion interne muni d'un mécanisme à taux de compression variable