Patent ID: 7028678

Claim:
An internal combustion engine having a plurality of cylinders ( 2 a , 2 b . 2 c , 2 d , 3 a , 3 b , 3 c , 3 d ) with some of said cylinders ( 3 a , 3 b , 3 c , 3 d ) being deactivatable during low load operation of said engine, said deactivatable cylinders ( 3 a , 3 b , 3 c , 3 d ) being configured specifically for high load engine operation and having a lower compression ratio (ε) than the rest of the cylinders ( 2 a , 2 b , 2 c , 2 d ), which are configured specifically for low load engine operation, a first turbocharger ( 12 ) connected to the cylinders ( 2 a – 2 d ) configured for low load engine operation for supplying charge air to the cylinders configured for low load engine operation and a second turbo-charger ( 13 ) connected to the cylinders ( 3 a – 3 d ) configured for high load engine operation for supplying charge air to the cylinders configured for high load engine operation, said second turbocharger ( 13 ) having a higher air throughput rate than said first turbocharger ( 12 ) for supplying more air to the cylinders which are configured for high load operation and have the lower compression ratio.