Volvo Car Corporation

Volvo Lastvagner Ab

Mats Moren

A cylinder deactivation arrangement and method of cylinder deactivation are disclosed for an internal combustion engine having a number of cylinders with at least one intake valve and at least one exhaust valve per cylinder. Each intake valve includes two different lifting levels, wherein the cylinder deactivation arrangement has an even number of cylinders. A first set of cylinders constituted by half of the even number of cylinders have intake valves configured for fully opened and partly opened lifting levels, and a second set of cylinders constituted by the other half of the even number of cylinders have intake valves configured for fully opened and closed lifting levels. The first set of cylinders have exhaust valves configured for fully opened lifting levels and the second set of cylinders have exhaust valves configured for fully opened and closed lifting levels.

Method and arrangement for cylinder deactivation

A method of calibration of at least one fuel injector for a fuel burner in an exhaust gas treatment system for an internal combustion engine is provided. The method is adapted for an exhaust gas system having the fuel burner mounted upstream of a diesel particle filter (DPF). The method of calibration is performed during an idle speed of the combustion engine, this to assure a constant temperature of the burner during the calibration. Hence, the method is started when a first steady tempera tore is registered in the fuel burner, wherein the at least one fuel injector, is operated with a first pulse width. A first temperature of an exhaust gas is registered directly downstream of the fuel burner. After this first temperature is registered, the pulse width, of the fuel injector changed into a second pulse width, which is different from the first pulse width.

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Torslanda, Sweden

Mats Moren