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1. (WO2017153525) A METHOD FOR OPERATING AN INTERNAL COMBUSTION PISTON ENGINE

Pub. No.:    WO/2017/153525    International Application No.:    PCT/EP2017/055548
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Fri Mar 10 00:59:59 CET 2017
IPC: F02D 19/08
F02B 75/02
F02D 41/00
Applicants: VOLVO TRUCK CORPORATION
Inventors: LUNDGREN, Staffan
Title: A METHOD FOR OPERATING AN INTERNAL COMBUSTION PISTON ENGINE
Abstract:
The invention provides a method for operating an internal combustion piston engine, comprising - introducing (S1, IOS) air into a cylinder (3) of the engine, - compressing the air in a first compression stroke (CS1) of the cylinder (3), - providing (S3, I1) fuel into the cylinder (3) for a first combustion, with a portion of the oxygen in the compressed air as oxidant, in a first power stroke (PS1) succeeding the first compression stroke (CS1), to produce residues including oxygen, - compressing (S5) the residues in a second compression stroke (CS2) succeeding the first power stroke (PS1), and - providing (S5, I2), after the first combustion, fuel into the cylinder (3) for a second combustion, with at least a portion of the oxygen of the residues as oxidant, in a second power stroke (PS2) succeeding the second compression stroke (CS2), - characterized in that the first compression stroke is repeated immediately after the second power stroke, and the introduction of air into the cylinder is done at the end of the second power stroke and/or at the beginning of the first compression stroke.