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A study on the characteristics of combustion variations of compression ignition engine

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This paper describes the results of a study of the variation of combustion characteristics in a precombusion chamber type water-cooled diesel engine. Statiscal analysis on cycle-by-cycle variation of combustion characteristics such as rate of pressure rise, heat release rate, and mass burning rate from combustion pressure-crank angle data of one thousand cycles were made under several operating conditions.

The influence of engine speed and coolant temperature upon maximum frequency of combustion characteristics are discussed also.

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Bottom dead center


Mass burning rate


Crank angle


Frequency distribution

H o :

Stagnation enthalpy


Rate of heat release(=dQ/dϕ)

(HR)max :

Maximum rate of heat release


Total number of sample

n :

Engine speed

(P)max :

Maximum pressure

(P max)m :

Mean value of peak pressure


Rate of pressure rise(=dP/dϕ)

(PR)max :

Maximum rate of pressure rise

S :

Standard deviation

T c :

Cooling water temperature


Top dead center

U :

Internal energy

W :


V :

Cylinder volume

Q :



Time interval of measurement

ϕ(HR)max :

Crank angle at maximum rate of heat release

ϕ(PR)max :

Crank angle at maximum rate of pressure rise

ξ :

Specific heat ratio

τ :



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Correspondence to Chang Sik Lee.

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Lee, C.S. A study on the characteristics of combustion variations of compression ignition engine. KSME Journal 1, 18–23 (1987).

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Key Words

  • Diesel Engine Combustion
  • Heat Release Rate
  • Pressure Rise Rate
  • Engine Combustion Variations