METHOD AND SYSTEM FOR CONTROLLING A TURBOCHARGED ENGINE DURING AN UPSHIFT

摘要

A method for propulsion of a vehicle (100), the vehicle (100) has a combustion engine (101) and a gearbox (103) that can be adjusted to a number of gear ratios for the transfer of force between the combustion engine (101) and at least one driving wheel (113, 114). The engine (101) combustion chamber has at least one inlet for supply of combustion gas and at least one outlet for evacuation of exhaust gas from the combustion chamber, a turbocharger unit (203) for pressurizing the combustion gas in the combustion chamber. During a change of gear from a first higher to a second lower gear ratio, wherein the rate of revolution of the combustion engine (101) is reduced from a first rate to a second rate, increasing the pressure (Put) at the chamber outlet (202) at least through the use of the turbocharger unit for constriction of the exhaust gas flow to reduce the pressure (Pin) at the combustion gas through the opening of a first valve (221) and, when the rate of revolution (n) of the combustion engine (101) has at least partially fallen towards the second rate of revolution (n2), controlling the turbocharger unit (203) such that the combustion gas pressure (Pin) is increased. Also a system and a vehicle are disclosed.

主权项

1. A method for the propulsion of a vehicle, wherein the vehicle comprises:
a combustion engine having a rotatable shaft, a gearbox connected to the engine shaft and the gearbox is adjustable to a number of gear ratios for transfer of a force between the combustion engine and at least one driving wheel of the vehicle; the combustion engine comprises at least one combustion chamber with at least one inlet for supply of combustion gas and at least one outlet for evacuation of an exhaust gas flow that results from combustion of the combustion gas in the combustion chamber, a turbocharger unit located and configured for pressurizing the combustion gas; the method comprises: during a change of gear in the gearbox from a first higher gear ratio to a second lower gear ratio, wherein a rate of revolution of the combustion engine shaft is reduced from a first rate of revolution (n1) to a second rate of revolution (n2): increasing the pressure (Put) at the outlet from the combustion chamber at least through the use of the turbocharger unit which is configured for constriction of the exhaust gas flow; reducing the pressure (Pin) at the combustion gas inlet through the opening of a first valve; and when the rate of revolution (n) of the combustion engine shaft has at least partially fallen towards the said second rate of revolution (n2), controlling the turbocharger unit such that the combustion gas pressure (Pin) is increased.