Method and apparatus for the charging-pressure-dependent control of a turbocharger in an internal combustion engine

Claim 1

An arrangement for the load-dependent control of a turbocharger of an internal combustion engine, comprising turbine guide means, adjusting drive means, control means, the turbine guide means being operable to be moved in the direction toward an open position or in the direction toward a closed position by way of the adjusting drive means controllable by the control means in dependence on a charging pressure signal, the control means being operable to initially guide the turbine guide means during a positive load change according to a first predetermined characteristic curve in the direction toward a closed position and subsequently according to a second predetermined characteristic curve again in the direction toward an open position in dependence on the charging pressure increase conditioned on load increase, wherein the internal combustion engine includes an injection pump having an adjusting lever, a vacuum pump, pressure converter means which receives by way of a first connection a first vacuum signal produced by the vacuum pump, by way of a second connection, a second vacuum signal which is modulated in dependence on the position of the adjusting lever, and by way of a third connection a charging pressure signal, the pressure converter means being operable in dependence on the applied signals to produce a control vacuum for the control of an aggregate arranged in a vehicle, and valve means arranged in a line feeding the second vacuum signal to the pressure converter means, said valve means being operable to close said last-mentioned line and at the same time to establish a connection between the vacuum pump and the second connection at the pressure converter means, the adjusting drive means being acted upon by the control vacuum.

Claim 9

A method for the load-dependent control of a turbocharger which is arranged at an internal combustion engine and includes a guide apparatus which is adapted to be moved in the direction toward an open position or in the direction toward a closed position by way of an adjusting drive controllable by a control device in dependence on charging pressure signals, comprising the steps of guiding the turbine guide apparatus in case of a positive load change initially according to a first predetermined characteristic curve in the direction toward a closed position and subsequently again in the direction toward an open position according to a second predetermined characteristic curve in dependence on the charging pressure increase conditioned on load increase, wherein the internal combustion engine includes an injection pump having an adjusting lever, a vacuum pump, pressure converter means which receives by way of a first connection a first vacuum signal produced by the vacuum pump, by way of a second connection, a second vacuum signal which is modulated in dependence on the position of the adjusting lever, and by way of a third connection a charging pressure signal, the pressure converter means being operable in dependence on the applied signals to produce a control vacuum for the control of an aggregate arranged in a vehicle, and valve means arranged in a line feeding the second vacuum signal to the pressure converter means, said valve means being operable to close said last-mentioned line and at the same time to establish a connection between the vacuum pump and the second connection at the pressure converter means, the adjusting drive means being acted upon by the control vacuum.

Claim 10

A method for the load-dependent control of a turbocharger which is arranged at an internal combustion engine and includes a guide apparatus which is adapted to be moved in the direction toward an open position or in the direction toward a closed position by way of an adjusting drive controllable by a control device in dependence on charging pressure signals, comprising the steps of guiding the turbine guide apparatus in case of a positive load change initially according to a first predetermined characteristic curve in the direction toward a closed position and subsequently again in the direction toward an open position according to a second predetermined characteristic curve in dependence on the charging pressure increase conditioned on load increase, wherein the internal combustion engine includes an injection pump having an adjusting lever, a vacuum pump, pressure converter means which receives by way of a first connection a first vacuum signal produced by the vacuum pump, by way of a second connection, a second vacuum signal which is modulated in dependence on the position of the adjusting lever, and by way of a third connection a charging pressure signal, the pressure converter means being operable in dependence on the applied signals to produce a control vacuum for the control of an aggregate arranged in a vehicle, and valve means arranged in a line feeding the second vacuum signal to the pressure converter means, said valve means being operable to close said last-mentioned line and at the same time to establish a connection between the vacuum pump and the second connection at the pressure converter means, the adjusting drive means being acted upon by the control vacuum.