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US 8,281,643 B2Granted
Cetane number determination apparatus for fuel of diesel engine and method of determining cetane number of fuel of diesel engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorHiromichi Yasuda
Life of this patent
Estimating the term…
Abstract
A minute amount of fuel is injected into a combustion chamber during fuel cut, and a cylinder pressure is detected when the minute amount of fuel is being combusted. Then a combustion ratio is calculated based on the detected cylinder pressure, and a determination crank angle, which is used for determining a cetane number based on the combustion ratio, is determined. The cetane number is determined based on the determination crank angle.
Claims6
A cetane number determination apparatus for a diesel engine, comprising:
- a cylinder pressure sensor that detects a pressure in a cylinder of the diesel engine;
- a crank angle sensor that detects a rotational position of a crankshaft of the diesel engine;
- and
- a control device that calculates the combustion ratio at a threshold crank angle at a combustion midpoint based on a first pressure in the cylinder at a first crank angle at a combustion start point, a second pressure in the cylinder at a second crank angle at a combustion end point, and a third pressure in the cylinder at the threshold crank angle, and determines the cetane number based on the combustion ratio at the threshold crank angle.
1 more element
The method of determining a cetane number for a diesel engine, comprising:
- detecting a first pressure in a cylinder at a first crank angle at a combustion start point, a second pressure in the cylinder at a second crank angle at a combustion end point, and a third pressure in the cylinder at a threshold crank angle at a combustion midpoint;
- calculating a combustion ratio at the threshold crank angle based on the first pressure, the second pressure, and the third pressure;
- and
- determining the cetane number based on a correlation map of the calculated combustion ratio at the threshold crank angle and the cetane number.
1 more element
Dependencies are inferred from the claim text.