Method for estimating quantity of fuel injected
AssigneeSiemens Aktiengesellschaft
InventorsRalf Bohnig, Michael Hardt, Peter Russe
Life of this patent
Estimating the term…
Abstract
The invention discloses a method for estimating an injected quantity of fuel of an isolated injection. The segment time of the cylinder in which the isolated injection takes place is evaluated numerically by forming the second temporal derivation. With the aid of the second temporal derivation of the segment time the injection parameters are updated using test quantity—test torque performance data.
Claims4
Method for estimating a quantity of fuel injected into a internal combustion engine with a number of cylinders, which features the following steps:
- a. Injection and combustion or a test quantity of fuel in a cylinder of the internal combustion engine during a phase of deactivated fuel feed,
- b. Determining a segment time T(k) of the internal combustion engine from signals of a crankshaft sensor,
- c. Calculating the test torque C(k) generated by the combustion of the test quantity from a numerically determined second temporal derivation of the segment time T(k) and
- d. Determining a size of the test quantity from the test torque C(k) calculated, based on a test quantity—test torque performance data.
The method as claimed in one of the previous claims, with the further step:
- Calculating the test torque from the difference between the test torque after the injection of the test quantity and the test torque before the injection of the test quantity.
Dependencies are inferred from the claim text.