METHOD AND CONTROL DEVICE FOR DETECTING A COMBUSTION PROCESS OF AN INTERNAL COMBUSTION ENGINE OF A HYBRID VEHICLE
First Claim
1. A method for detecting a combustion process of an internal combustion engine of a hybrid vehicle wherein the internal combustion engine includes a crankshaft, the method comprising:
- acquiring a rotational speed signal representing a rotational speed of the crankshaft;
acquiring a crankshaft angle signal representing a crankshaft angle of the crankshaft; and
determining, based on the rotational speed signal and the crankshaft angle signal, whether a combustion occurs in the internal combustion engine, wherein the step of determining includes detecting a rotational speed curve shape based on the rotational speed signal, wherein the rotational speed curve shape includes a dead center rotational speed and a rotational speed maximum, wherein the dead center rotational speed is reached when a cylinder piston of the internal combustion engine is at a top dead center in a power stroke, and wherein the step of determining further includes ascertaining a maximum increase of the rotational speed, starting from the dead center rotational speed up to the rotational speed maximum, wherein the step of determining further includes ascertaining a reference rotational speed, at which a given percentage of the maximum increase is reached, and ascertaining a reference crankshaft angle associated with the reference rotational speed, wherein the step of determining whether a combustion occurs is based on a threshold angle and includes comparing the reference crankshaft angle to the threshold angle and detecting that a combustion occurs when the reference crankshaft angle exceeds the threshold angle.
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Accused Products
Abstract
A method for detecting a combustion process of an internal combustion engine of a hybrid vehicle includes the steps of acquiring a rotational speed signal representing a rotational speed of the crankshaft, acquiring a crankshaft angle signal representing a crankshaft angle of the crankshaft, and determining, based on the rotational speed signal and the crankshaft angle signal, whether a combustion occurs in the internal combustion engine. A control device for detecting a combustion process of an internal combustion engine of a hybrid vehicle is also provided.
6 Citations
12 Claims
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1. A method for detecting a combustion process of an internal combustion engine of a hybrid vehicle wherein the internal combustion engine includes a crankshaft, the method comprising:
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acquiring a rotational speed signal representing a rotational speed of the crankshaft; acquiring a crankshaft angle signal representing a crankshaft angle of the crankshaft; and determining, based on the rotational speed signal and the crankshaft angle signal, whether a combustion occurs in the internal combustion engine, wherein the step of determining includes detecting a rotational speed curve shape based on the rotational speed signal, wherein the rotational speed curve shape includes a dead center rotational speed and a rotational speed maximum, wherein the dead center rotational speed is reached when a cylinder piston of the internal combustion engine is at a top dead center in a power stroke, and wherein the step of determining further includes ascertaining a maximum increase of the rotational speed, starting from the dead center rotational speed up to the rotational speed maximum, wherein the step of determining further includes ascertaining a reference rotational speed, at which a given percentage of the maximum increase is reached, and ascertaining a reference crankshaft angle associated with the reference rotational speed, wherein the step of determining whether a combustion occurs is based on a threshold angle and includes comparing the reference crankshaft angle to the threshold angle and detecting that a combustion occurs when the reference crankshaft angle exceeds the threshold angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A data memory containing a computer program with instructions for executing a method of:
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acquiring a rotational speed signal representing a rotational speed of a crankshaft of an internal combustion engine of a hybrid vehicle; acquiring a crankshaft angle signal representing a crankshaft angle of the crankshaft; and determining, based on the rotational speed signal and the crankshaft angle signal, whether a combustion occurs in the internal combustion engine, wherein the step of determining includes detecting a rotational speed curve shape based on the rotational speed signal, wherein the rotational speed curve shape includes a dead center rotational speed and a rotational speed maximum, wherein the dead center rotational speed is reached when a cylinder piston of the internal combustion engine is at a top dead center in a power stroke, and wherein the step of determining further includes ascertaining a maximum increase of the rotational speed, starting from the dead center rotational speed up to the rotational speed maximum, wherein the step of determining further includes ascertaining a reference rotational speed, at which a given percentage of the maximum increase is reached, and ascertaining a reference crankshaft angle associated with the reference rotational speed, wherein the step of determining whether a combustion occurs is based on a threshold angle and includes comparing the reference crankshaft angle to the threshold angle and detecting that a combustion occurs when the reference crankshaft angle exceeds the threshold angle.
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11. A control device for detecting a combustion process of an internal combustion engine of a hybrid vehicle, the internal combustion engine having a crankshaft and a cylinder piston, the control device comprising:
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a signal input configured to acquire a rotational speed signal representing a rotational speed of the crankshaft and a crankshaft angle signal representing a crankshaft angle of the crankshaft; and a processor configured to determine, based on the rotational speed signal and the crankshaft angle signal, whether a combustion occurs in the internal combustion engine, wherein said processor detects a rotational speed curve shape based on the rotational speed signal, wherein the rotational speed curve shape includes a dead center rotational speed and a rotational speed maximum, wherein the dead center rotational speed is reached when the cylinder piston of the internal combustion engine is at a top dead center in a power stroke, and said processor ascertains a maximum increase of the rotational speed, starting from the dead center rotational speed up to the rotational speed maximum, said processor ascertains a reference rotational speed at which a given percentage of the maximum increase is reached, said processor ascertains a reference crankshaft angle associated with the reference rotational speed, and said processor determines whether a combustion occurs based on a threshold angle and compares the reference crankshaft angle to the threshold angle and detects that a combustion occurs when the reference crankshaft angle exceeds the threshold angle.
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12. A hybrid vehicle comprising:
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a plurality of drive systems, a first one of said drive systems being configured as an internal combustion engine with a crankshaft and a cylinder piston, a second one of said drive systems being configured as an electric drive; a control device for detecting a combustion process of the internal combustion engine, said control device acquiring a rotational speed signal representing a rotational speed of said crankshaft and acquiring a crankshaft angle signal representing a crankshaft angle of said crankshaft; and said control device determining, based on the rotational speed signal and the crankshaft angle signal, whether a combustion occurs in said internal combustion engine, wherein said control device detects a rotational speed curve shape based on the rotational speed signal, wherein the rotational speed curve shape includes a dead center rotational speed and a rotational speed maximum, wherein the dead center rotational speed is reached when said cylinder piston of said internal combustion engine is at a top dead center in a power stroke, and said control device ascertains a maximum increase of the rotational speed, starting from the dead center rotational speed up to the rotational speed maximum, said control device ascertains a reference rotational speed at which a given percentage of the maximum increase is reached, said control device ascertains a reference crankshaft angle associated with the reference rotational speed, and said control device determines whether a combustion occurs based on a threshold angle and compares the reference crankshaft angle to the threshold angle and detects that a combustion occurs when the reference crankshaft angle exceeds the threshold angle.
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Specification