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Table 5 Accuracy and relative error of measured parameters

From: Numerical simulation of a diesel engine performance powered by soybean biodiesel and diesel fuels

Measured parameter

Accuracy

Relative error (%)

Engine brake power

 

3.96

 Torque

 ± 2%

2

 Speed

 ± 2%

2

In-cylinder pressure

 

4.92

 Piezoelectric pressure sensor

 ± 2%

2

 Charge amplifier

 ± 1%

1

 Digitizing oscilloscope

 ± 2%

2

Air flow rate

 ± 0.2 mm H2O

1.64

Diesel fuel flow rate

 ± 8.27 × 10–3 kg/h

1.51

Thermocouple

 ± 0.55 °C

1.57

Crankshaft position

 

3.9

 Magnetic pickup

 ± 1%

1

 Wave shaper

 ± 1%

1

NO

 ± 5 ppm

5.88

CO

 ± 1%

3.28

CO2

 ± 1%

3.57

HC

 ± 3 ppm

3.08