Method and device for controlling a turbocharger
AssigneeGe Jenbacher GmbH & Co Og
InventorsJakub HOLECEK, Guenther WALL
Life of this patent
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Abstract
A method for establishing a permitted maximum differential pressure (Δpmax) of an air filter (3) arranged in an intake tract (2) of an internal combustion engine (1), wherein a control reserve of the internal combustion engine (1) is determined and the maximum permissible differential pressure (Δpmax) of the air filter (3) is established as a function of the determined control reserve.
Claims14
A method for establishing a permitted maximum differential pressure (Δpmax) of an air filter (3) arranged in an intake tract (2) of an internal combustion engine (1), wherein a control reserve of the internal combustion engine (1) is determined and the maximum permissible differential pressure (Δpmax) of the air filter (3) is established as a function of the determined control reserve.
A method according to at least one of the preceding claims, wherein a load state of the air filter (3) is being determined.
A method according to at least one of the preceding claims, wherein:
- a standard air flow is calculated from the operating variables of the internal combustion engine
- the actual present air flow is calculated taking into account the ambient pressure and the charge-air temperature from the standard air flow
- a comparison of a measured differential pressure (Δp) via the air filter with the maximum permitted differential pressure (Δpmax) for the actual present air flow takes place
A method according to at least one of the preceding claims, wherein based on the calculated actual present air flow and a maximum permitted differential pressure (Δpmax) adjusted via the actual present air flow, the load condition and/or the remaining operating time of the air filter (3), particularly in a partial-load operation, of the internal combustion engine is estimated.
A method according to at least one of the preceding claims, wherein the degradation of the air filter (3) and the internal combustion engine (1) are monitored and
- it gets calculated which maximum permitted differential pressure (Δpmax) may be authorized
- and/or extrapolated into the future and estimated, when the air filter (3) must be replaced.
Internal combustion engine (1) comprising
- at least one air filter (3) arranged in an intake tract (2) of an internal combustion engine (1)
- a control device (9), in which a maximum permitted differential pressure (Δpmax) for the air filter can be stored
- characterized in that the control device (9) is designed to determine a specific control reserve of the internal combustion engine (1) and the maximum permitted differential pressure (Δpmax) of the air filter (3) from the measurement values of the at least one sensor and the operating data of the internal combustion engine (1) as a function of the determined control reserve.
An internal combustion engine according to the preceding claim, wherein a control range of a control variable for the flow of a fuel-air mixture or an exhaust gas is given as a control reserve, preferably in isolation or any combination:
- the position of a bypass valve (4) of a turbocharger bypass (5) of the internal combustion engine (1)
- the position of a throttle valve (6) of the internal combustion engine (1)
- the position of a wastegate (7)
- an adjustable geometry of a turbocharger (8)
An internal combustion engine according to at least one of the preceding claims, wherein the control reserve is given by:
- a control range of a control element for the specific energy density of the fuel-air mixture, preferably a lambda value
- a control range of a control element for the ignition time for the spark ignition of a fuel-air mixture in the combustion chambers of the internal combustion engine
- a control range of a control element for the volumetric efficiency, preferably adjustment of a variable valve train
- a control range of a control element for an EGR rate
An internal combustion engine according to at least one of the preceding claims, wherein the control device (9) is designed to determine the load state of the air filter (3).
An internal combustion engine according to at least one of the preceding claims, wherein the control device (9) is designed to:
- calculate a standard air flow from the operating variables of the internal combustion engine (1)
- calculate an actual present air flow taking into account the ambient pressure and the charge air temperature from the standard air flow
- carry out a comparison of a measured differential pressure (Δp) via the air filter (3) with the maximum permitted differential pressure (Δpmax) for the actual present air flow
An internal combustion engine according to at least one of the preceding claims, wherein the control device (9) is designed to carry out the measurement of the actual present differential pressure (Δp) and of the operating variables of the internal combustion engine (1) for the calculation of the standard air flow and the measurement of the ambient pressure and the charge-air temperature continuously or cyclically.
Dependencies are inferred from the claim text.