Internal combustion engine and method, computer program and control apparatus for operating the internal combustion engine
AssigneeRobert Bosch GmbH
InventorUwe Liskow
Life of this patent
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Abstract
In an internal combustion engine, the fuel reaches a combustion chamber via at least one fuel-injecting device. The fuel-injecting device includes a piezo actuator. The drive energy (U), which is necessary for a specific stroke (h) of the piezo actuator, is determined from at least one function (34 to 40) which couples the stroke (h), the drive energy (U) and the drive time (t) of the piezo actuator with each other. In order to more accurately adjust the stroke of the piezo actuator, it is suggested that a function (34 to 40) be used for the determination of the drive energy (U). These functions (34 to 40) were previously determined for a typical collective load (L1, L2) to which a piezo actuator is subjected.
Claims13
A method for operating an internal combustion engine wherein fuel reaches a combustion chamber of said engine via a fuel injection device which includes a piezo actuator operating over a running or operating time (t) and for which a drive energy (U) is required for a specific stroke (h), the method comprising the steps of:
- determining a function which couples said stroke (h), said drive energy (U) and said operating time (t) for a typical collective load (L1, L2) to which a piezo actuator can be subjected;
- and,
- utilizing said function to determine said required drive energy (U) for said specific stroke (h).
A computer program comprising a method which can be carried out when said computer program is run on a computer, the method being for operating an internal combustion engine wherein fuel reaches a combustion chamber of said engine via a fuel injection device which includes a piezo actuator operating over a running or operating time (t) and for which a drive energy (U) is required for a specific stroke (h), the method comprising the steps of:
- determining a function which couples said stroke (h), said drive energy (U) and said operating time (t) for a typical collective load (L1, L2) to which a piezo actuator can be subjected;
- and,
- utilizing said function to determine said required drive energy (U) for said specific stroke (h).
A control apparatus for operating an internal combustion engine, the control apparatus comprising:
- a memory storing a computer program for carrying out a method for operating an internal combustion engine wherein fuel reaches a combustion chamber of said engine via a fuel injection device which includes a piezo actuator operating over a running or operating time (t) and for which a drive energy (U) is required for a specific stroke (h), the method comprising the steps of:
- determining a function which couples said stroke (h), said drive energy (U) and said operating time (t) for a typical collective load (L1, L2) to which a piezo actuator can be subjected;
- and,
- utilizing said function to determine said required drive energy (U) for said specific stroke (h).
An internal combustion engine comprising:
- a combustion chamber;
- an injection device via which fuel reaches said combustion chamber and said injection device including a piezo actuator;
- a control apparatus including means for determining a drive energy (U) required for a specific stroke (h) of said piezo actuator from at least a function which couples said stroke (h), the drive energy (U) and the operating time (t) and which had been determined for a typical collective load (L1, L2) to which a piezo actuator can be subjected.
Dependencies are inferred from the claim text.