Method and apparatus for determining the cylinder charge in the case of unthrottled internal-combustion engines
AssigneeBayerische Motoren Werke Aktiengesellschaft
InventorGerd Kraemer
Life of this patent
Estimating the term…
Abstract
A method and apparatus is provided for determining the cylinder charge in the case of unthrottled internal-combustion engines with a variable valve gear. For determining the fresh-air cylinder charge in the case of such internal-combustion engines, the following steps are followed (i) at least one engine operating value is determined, (ii) a standardized air flow rate is determined relative to a defined inlet and outlet spread as a function of the at least one engine operating value, and (iii) the influence of the actual inlet spread existing in comparison to the defined inlet spread on the air flow rate is determined and a corrected air flow rate is calculated.
Claims16
Method for determining a cylinder charge in the case of unthrottled internal-combustion engines, which have valves with a variable valve gear, said method comprising;
- determining at least one engine operating value,
- determining a standardized air flow rate relative to at least one of a defined inlet spread and a defined outlet spread as a function of the at least one engine operating value, and
- determining the influence of a respective one of at least one of an actual inlet spread and an actual outlet spread existing in comparison to the corresponding respective one of the defined inlet spread and defined outlet spread on the air flow rate and calculating a corrected air flow rate based on the determined influence.
Apparatus for determining a cylinder charge in the case of unthrottled internal-combustion engines which have valves with a variable valve gear, comprising:
- means for determining at least one engine operating value,
- means for determining a standardized air flow rate relative to at least one of a defined inlet spread and a defined outlet spread as a function of the at least one engine operating value, and
- means for determining the influence of at least one of an actual inlet spread existing in comparison to the defined inlet spread and an actual outlet spread existing in comparison to the defined outlet spread on the air flow rate and calculating a corrected air flow rate based on the determined influence.
Dependencies are inferred from the claim text.