Method and device for operating an internal combustion engine
Various embodiments include a method comprising: determining a torque output of each cylinder resulting from a fuel injection into the cylinder; determining a difference in the respective torque; comparing the difference in the respective torque output with a threshold; if the difference exceeds the threshold, changing the injection mass for at least one cylinder based on the difference; determining a further torque output of the cylinder resulting from the injection of the changed injection mass; determining whether the further torque output corresponds to the changed injection mass; if the further torque output lies outside a predetermined tolerance range for a corresponding injection mass, setting the injection mass to be injected to the original value; and changing the injection time in at least the one of the at least two cylinders.
1. A method for operating an internal combustion engine having at least two cylinders, the method comprising:
injecting a first amount of fuel into each of the at least two cylinders;
determining a respective torque output of each of the at least two cylinders resulting from the injection of the first amount of fuel into each cylinder;
determining a difference in the respective torque of each of the at least two cylinders;
comparing the difference in the respective torque with a predetermined threshold value;
if the determined difference exceeds the threshold value, injecting a second amount of fuel, different from the first amount of fuel for at least one of the at least two cylinders based at least in part on the determined difference;
determining a further torque output of the at least one of the at least two cylinders resulting from the injection of the second amount of fuel;
determining whether the further torque output corresponds to the second amount of fuel;
if the further torque output lies outside a predetermined tolerance range for a corresponding injection mass, setting an injection mass to be injected to the first amount of fuel; and
changing the injection time in at least the one of the at least two cylinders.
2. The method as claimed in claim 1 , further comprising:
determining a crankshaft acceleration of a crankshaft of the internal combustion engine resulting from an injection of fuel into the respective cylinder; and
determining the respective torque output based at least in part on the respective crankshaft acceleration.
3. The method as claimed in claim 2 , wherein determining the crankshaft acceleration includes monitoring a transmitter wheel sensor and a transmitter wheel coupled to the crankshaft.
4. The method as claimed in claim 2 , wherein determining the crankshaft acceleration includes monitoring a running smoothness of the internal combustion engine.
5. The method as claimed in claim 2 , wherein determining the crankshaft acceleration includes monitoring a change in rotational speed of the crankshaft.
6. The method as claimed in claim 1 , further comprising repeating the method until a further determined difference in the torque outputs is less than the predetermined threshold value for the torque output.
7. The method as claimed in claim 6 , further comprising determining another defect if, after a predetermined time interval, the further determined difference is not less than the predetermined threshold value for the torque output.
8. A device comprising:
a processor; and
a memory storing a set of instructions, the set of instructions, when loaded and executed by the processor, causing the processor to:
determine a respective torque output of each of at least two cylinders of an internal combustion engine resulting from a first amount of fuel injected into each of the at least two cylinders respective cylinder;
determine a difference in the respective torque generated by each of the at least two cylinders;
comparing the difference in the respective torque with a predetermined threshold value;
if the determined difference exceeds the threshold value, injecting a second amount of fuel different from the first amount of fuel for at least one of the at least two cylinders based at least in part on the determined difference;
determining a further torque output of the at least one of the at least two cylinders resulting from the injection of the second amount of fuel;
determining whether the further torque output corresponds to the second amount of fuel;
if the further torque output lies outside a predetermined tolerance range for a corresponding injection mass, setting an injection mass to be injected to the first amount of fuel; and
changing the injection time in at least one of the at least two cylinders.