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US 7,921,700 B2Granted
Method for determining cylinder-specific combustion features of an internal combustion engine
AssigneeRobert Bosch GmbH
InventorsFranz Raichle, Peter Skala, Andreas Rupp, Wolfgang Fischer, Michael Kessler, Mohamed Youssef, Joerg Breuninger, Haris Hamedovic, Axel Loeffler
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Abstract
A method for determining cylinder-specific combustion features of an internal combustion engine, the cylinder-specific combustion features being ascertained from a variable which represents the crankshaft speed, especially being ascertained from a signal of a crankshaft sensor or camshaft sensor. The cylinder-specific combustion features include a combustion position of at least one cylinder and/or a torque of the crankshaft.
Claims24
A method for determining cylinder-specific combustion features of an internal combustion engine, the method comprising:
- ascertaining, using a processor arrangement, the cylinder-specific combustion features from a variable which represents a speed of a crankshaft, the cylinder-specific combustion features including:
- i) a combustion position of at least one cylinder, and ii) a torque of the crankshaft;
- wherein the torque is a mean indicated torque over an angular range of a crankshaft angle,
- wherein the combustion position is determined from a differential gas-torque curve ascertained over the angular range of the crankshaft angle,
- wherein the differential gas-torque curve is ascertained from the difference between a gas-torque curve and an overrun-torque curve, and
- wherein the cylinder-specific combustion features are ascertained from a signal of one of a crankshaft sensor and a camshaft sensor.
3 more elements
A method for determining cylinder-specific combustion features of an internal combustion engine, the method comprising:
- ascertaining the cylinder-specific combustion features from a variable which represents a speed of a crankshaft, the cylinder-specific combustion features including:
- i) a combustion position of at least one cylinder, and ii) a torque of the crankshaft;
- wherein the torque is a mean indicated torque over an angular range of a crankshaft angle,
- wherein the combustion position is determined from a differential gas-torque curve ascertained over the angular range of the crankshaft angle,
- wherein the combustion position is determined from a centroid of the differential gas-torque curve ascertained over the angular range of the crankshaft angle,
- wherein the differential gas-torque curve is ascertained from the difference between a gas-torque curve and an overrun-torque curve, and
- wherein the cylinder-specific combustion features are ascertained from a signal of one of a crankshaft sensor and a camshaft sensor.
4 more elements
A control unit for an internal combustion engine, comprising:
- an arrangement adapted to determine cylinder-specific combustion features of an internal combustion engine, the cylinder-specific combustion features being ascertained from a variable which represents a speed of a crankshaft from a signal of one of a crankshaft sensor or camshaft sensor,
- wherein the cylinder-specific combustion features include a combustion position of one cylinder and a torque of the crankshaft,
- wherein the torque is a mean indicated torque over an angular range of a crankshaft angle,
- wherein the combustion position is determined from a differential gas-torque curve ascertained over the angular range of the crankshaft angle,
- wherein the combustion position is determined from a centroid of the differential gas-torque curve ascertained over the angular range of the crankshaft angle,
- wherein the differential gas-torque curve is ascertained from the difference between a gas-torque curve and an overrun-torque curve, and
- wherein the cylinder-specific combustion features are ascertained from the signal of one of the crankshaft sensor and the camshaft sensor.
4 more elements
An internal combustion engine, comprising:
- a control unit adapted to determine cylinder-specific combustion features of an internal combustion engine, the cylinder-specific combustion features being ascertained from a variable which represents a speed of a crankshaft from a signal of at least one of a crankshaft sensor or camshaft sensor,
- wherein the cylinder-specific combustion features include at least one of a combustion position of one cylinder and a torque of the crankshaft,
- wherein the torque is a mean indicated torque over an angular range of a crankshaft angle,
- wherein the combustion position is determined from a differential gas-torque curve ascertained over the angular range of the crankshaft angle,
- wherein the combustion position is determined from a centroid of the differential gas-torque curve ascertained over the angular range of the crankshaft angle,
- wherein the differential gas-torque curve is ascertained from the difference between a gas-torque curve and an overrun-torque curve, and
- wherein the cylinder-specific combustion features are ascertained from the signal of one of the crankshaft sensor and the camshaft sensor.
4 more elements
A non-transitory computer-readable medium having a computer program, the computer program being executable by a computer, comprising:
- a computer program arrangement having program code for performing the following:
- ascertaining cylinder-specific combustion features from a variable which represents a speed of a crankshaft, the cylinder-specific combustion features including:
- i) a combustion position of at least one cylinder, and ii) a torque of the crankshaft;
- wherein the torque is a mean indicated torque over an angular range of a crankshaft angle,
- wherein the combustion position is determined from a differential gas-torque curve ascertained over the angular range of the crankshaft angle,
- wherein the combustion position is determined from a centroid of the differential gas-torque curve ascertained over the angular range of the crankshaft angle,
- wherein the differential gas-torque curve is ascertained from the difference between a gas-torque curve and an overrun-torque curve, and
- wherein the cylinder-specific combustion features are ascertained from the signal of one of the crankshaft sensor and the camshaft sensor.
5 more elements
A method for determining cylinder-specific combustion features of an internal combustion engine, the method comprising:
- ascertaining the cylinder-specific combustion features from a variable which represents a speed of a crankshaft, the cylinder-specific combustion features including:
- i) a combustion position of at least one cylinder, and ii) a torque of the crankshaft, wherein the torque is a mean indicated torque over an angular range of a crankshaft angle, and wherein the combustion position is determined from a differential gas-torque curve ascertained over the angular range of the crankshaft angle;
- wherein the cylinder-specific combustion features are ascertained from a signal of one of a crankshaft sensor or a camshaft sensor, wherein the differential gas-torque curve is ascertained from the difference between a gas-torque curve and an overrun-torque curve, and wherein the overrun gas-torque curve is ascertained from a model of the internal combustion engine with the aid of a function, into which are entered at least a charge-air pressure, an ambient pressure, a wall-heat loss and a gas composition in the cylinders.
Dependencies are inferred from the claim text.