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AssigneeRobert Bosch GmbH
InventorsHermann Gaessler, Udo Diehl, Karsten Mischker, Rainer Walter, Bernd Rosenau, Juergen Schiemann, Christian Grosse, Georg Mallebrein, Volker Beuche, Stefan Reimer
Estimating the term…
A method and a device for controlling a gas fill of a plurality of cylinders in an internal combustion engine having variable valve timing, in which a detection signal of a filling sensor is sampled with a sampling rate. Furthermore, a detection interval is determined for one cylinder. The sampling values for ascertaining a sampling-value sum are added up within this detection interval. In addition, a number of sampling values within the first detection interval are counted for ascertaining a first count value. The air mass filled into the first cylinder is then ascertained by forming a quotient from the sampling-value sum and the count value.
A method for controlling a gas fill of a plurality of cylinders in an internal combustion engine having variable valve timing, comprising the steps of:
A device for controlling a gas fill of a plurality of cylinders in an internal combustion engine having variable valve timing, comprising:
Dependencies are inferred from the claim text.
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Circuit arrangements for generating control signals: by measuring intake air flow
Variable control of intake and exhaust valves: changing valve lift or valve lift and timing
Electrical control of supply of combustible mixture or its constituents: controlling intake air
During engine operation: fully variable control of valve lift and timing using camless actuation systems such as hydraulic, pneumatic or…
Term ended 21 Jan 2022 (estimated)
The present invention relates to a method and a device for controlling a gas fill of a plurality of cylinders in an internal combustion engine having variable valve timing.
Conventional internal combustion engines have one or more camshafts for controlling the engine valves with a predefined lifting curve. The lifting curve of valve actuators of the engine valves is defined by the design of the camshaft. However, a defined lifting curve does not permit optimal operation of the internal combustion engine in each operating state, since in general, different operating states of the internal combustion engine require different lifting curves.
Because of the fixed lifting curve, control of a gas exchange, i.e. filling a gas into a cylinder and letting gas out, is possible only to a limited extent in a conventional internal combustion engine having cam-actuated valves, and cannot be optimized for all operating states. A gas fill denotes the charge of a combustion chamber of the cylinder with air, added fuel and, depending on the operating state and the type of internal combustion engine, a recirculated exhaust gas from the combustion.
FIG. 1 shows a schematic representation of an internal combustion engine having a fully variable valve train.
FIG. 2 shows a gas-exchange actuator.
FIG. 3 shows a diagram for clarifying the present invention.
FIG. 1 shows a schematic representation of a cylinder of an internal combustion engine 1 having a fully variable valve train. In a fully variable valve train, a phase and lift of the corresponding valve is alterable. Reference numeral 2 denotes a piston of a cylinder that is connected via a connecting rod 3 to a schematically represented crankshaft 4. Piston 2 bounds a combustion chamber of the cylinder. Arranged on crankshaft 4 is a crank-angle sensor 6 which detects a crank angle.
A spark plug 5 is arranged in the combustion chamber of the cylinder. The combustion chamber of the cylinder can be filled with gas via an intake valve 7 and emptied via an exhaust valve 8.
Intake valve 7 and exhaust valve 8 are opened or closed by a gas-exchange actuator 9 for intake valve 7 and a gas-exchange actuator 10 for the exhaust valve.