Electronic control device and combustion state detection system
AssigneeHitachi Astemo, Ltd.
InventorsToshihiro Aono, Osamu Mukaihara, Kotaro Oki
Life of this patent
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Abstract
A rotation speed or a rotation time of a crankshaft at a certain angle is calculated on a basis of a change in a detection signal of a sensor of the crankshaft. Then, when a combustion cylinder is switched, information on the rotation speed or the rotation time for at least two combustion cycles is obtained, and a combustion phase is calculated on the basis of the rotation speed or the rotation time. Accordingly, by using the that measures rotation of the crankshaft, it becomes possible to detect a combustion state of the internal combustion engine with high accuracy.
Claims6
An electronic control device that controls an internal combustion engine by detecting a combustion state of the internal combustion engine on a basis of a sensor signal of a crank angle sensor that measures rotation of a crankshaft of the internal combustion engine, the electronic control device comprising:
- a crank angle synchronization processing unit that calculates a rotation speed or a rotation time of the crankshaft at a certain angle on a basis of a change in the sensor signal;
- and
- a time synchronization processing unit that receives information on the rotation speed or the rotation time for at least two combustion cycles from the crank angle synchronization processing unit when a combustion cylinder of the internal combustion engine is switched, and calculates a combustion phase on a basis of the received rotation speed or rotation time;
- and
- wherein the time synchronization processing unit calculates a combustion torque by performing filtering processing on the received information of the rotation speed or the rotation time with a filter in which a gain is proportional to a frequency up to a predetermined frequency and the gain attenuates at the predetermined frequency or more, and calculates a combustion phase of the internal combustion engine by searching for a peak of the calculated combustion torque.
A combustion state detection system that detects a combustion state of the internal combustion engine on a basis of a sensor signal of a crank angle sensor that measures rotation of a crankshaft of the internal combustion engine, the combustion state detection system comprising:
- a crank angle synchronization processing unit that calculates a rotation speed or a rotation time of the crankshaft at a certain angle on a basis of a change in the sensor signal;
- and
- a time synchronization processing unit that receives information on the rotation speed or the rotation time for at least two combustion cycles from the crank angle synchronization processing unit when a combustion cylinder of the internal combustion engine is switched, and calculates a combustion phase on a basis of the received rotation speed or rotation time;
- wherein the time synchronization processing unit calculates a combustion torque by performing filtering processing on the received information of the rotation speed or the rotation time with a filter in which a gain is proportional to a frequency up to a predetermined frequency and the gain attenuates at the predetermined frequency or more, and calculates a combustion phase of the internal combustion engine by searching for a peak of the calculated combustion torque.
Dependencies are inferred from the claim text.