Motor vehicle valve train adjustment device
In a motor vehicle valve train adjustment device comprising at least one camshaft with at least two axially displaceable cam elements wherein at least one cam element has a cam track with a valve lift and a cam track with zero valve lift for a deactivation of at least one cylinder, and at least one other cam element of the at least two axially displaceable cam elements has a cam track with a first valve lift and a cam track with a second valve lift by which a cylinder which remains fueled during a partial cylinder deactivation is adapted to the at least one cylinder deactivation by special valve lift characteristics.
1. A motor vehicle valve train adjustment device comprising at least one camshaft ( 10 ) with first and second cam elements ( 12 , 13 , 14 , 15 ) axially displaceably disposed thereon, the first cam elements ( 13 , 14 ) having a cam track ( 20 , 21 , 22 , 23 ) with a first valve lift and an adjacent cam track ( 28 , 29 , 30 , 31 ) with zero cam lift for cylinder deactivation and the second cam elements ( 12 , 15 ) having a cam track ( 36 , 37 , 38 , 39 ) with the first valve lift and a cam track ( 44 , 45 , 46 , 47 ) with a second valve lift designed for operation in connection with a cylinder deactivation by activation of the zero lift cams ( 28 , 29 , 30 , 31 ) of the first cam elements ( 13 , 14 ), and a control unit ( 52 ) for axially displacing the first cam elements ( 13 , 14 ) between an all cylinder activation and a partial cylinder deactivation position, in which the zero lift cams are activated and the second cam element ( 12 , 15 ) are moved to a position providing for the second valve lift associated with the partial cylinder inactivation providing for a continuing engine power generation by increased power output of the remaining active cylinders.
2. The motor vehicle valve train adjustment device according to claim 1 , wherein the at least one camshaft ( 10 ) is an intake camshaft and an exhaust camshaft ( 11 ) is provided for operating exhaust valves.
3. The motor vehicle valve train adjustment device according to claim 2 , wherein the exhaust camshaft ( 11 ) comprises at least two axially displaceably arranged cam elements ( 16 , 17 , 18 , 19 ), wherein at least one cam element ( 17 , 18 ) of the at least two cam elements ( 16 , 17 , 18 , 19 ) has a cam track ( 24 , 25 , 26 , 27 ) with valve lift and a cam track ( 32 , 33 , 34 , 35 ) with zero lift for cylinder deactivation.
4. The motor vehicle valve train adjustment device according to claim 2 , wherein the at least one other cam element ( 16 , 19 ) of the at least two cam elements ( 16 , 17 , 18 , 19 ) of the exhaust camshaft ( 11 ) has a cam track ( 40 , 41 , 42 , 43 ) with a first valve lift and a cam track ( 48 , 49 , 50 , 51 ) with a second valve lift.
5. The motor vehicle valve train adjustment device according to claim 4 , wherein a control unit ( 52 ) is provided for switching, in at least one operating state, all cam elements ( 12 , 13 , 14 , 15 ) of the intake camshaft ( 10 ) and for switching only cam elements ( 17 , 18 ) to be deactivated of the exhaust camshaft.
6. The motor vehicle valve train adjustment device according to claim 3 , wherein a control unit ( 52 ) is provided for switching, in at least one operating state, all cam elements ( 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ) of the intake camshaft ( 10 ) and of the exhaust camshaft ( 11 ).
7. The motor vehicle valve train adjustment according to claim 4 , wherein a control unit ( 52 ) is provided for switching, in at least one operating state, at least one cam element ( 17 , 18 ) of the exhaust camshaft ( 11 ) to zero lift and for switching at least one cam element ( 16 , 19 ) of the an exhaust camshaft ( 11 ) to a valve lift that is associated with lower power.
8. An internal combustion engine comprising a motor vehicle valve train adjustment device according to claim 1 .