ah0010p201001a

Notes on performance correction

Type ah · topic 00.10 · version 0104 · 2012-07-14

Applies to: ENGINE 104, 111, 111.9 (except 111.943/944/947/955/956/957/958/973/975/982/983), 112, 112.9 (except 112.960), 113, 119, 120, 137, 166, 601, 602 (except 602.98), 603, 604 (except /912), 605 (except 605.96), 606 (except 606.96)

Where it sits

Function group 0 Overall › 00 Overall vehicle › 00.10 Complete vehicle, technical data, tests required by law — Series 166 · Series 601 · Series 602

EinPAS 45 Data/information › 45.10 Overall vehicle › 45.10.1 Basic information — Series 166 · Series 601 · Series 602

Also applies to engines/gearboxes: 104 ***, 111 ***, 111 920, 111 921, 111 940, 111 941, 111 942, 111 945, 111 946, 111 948, 111 950, 111 951, 111 952, 111 960, 111 961, 111 970, 111 974, 111 977, 111 978, 111 979, 111 980, 111 981, 111 984, 112 ***, 112 910, 112 911, 112 912, 112 913, 112 914, 112 915, 112 916, 112 917, 112 920, 112 921, 112 922, 112 923, 112 925, 112 940, 112 941, 112 942, 112 943, 112 944, 112 945, 112 946, 112 947, 112 949, 112 951, 112 953, 112 954, 112 955, 112 961, 112 970, 112 972, 112 973, 112 975, 112 976, 113 ***, 119 ***, 120 ***, 137 ***, 603 ***, 603 50*, 603 60*, 603 91*, 603 93*, 603 96*, 604 ***, 604 910, 604 915, 604 917, 605 91*, 606 91*

AH00.10-P-2010-01A

Notes on performance correction

ENGINE

104, 111, 111.9 (except 111.943/944/947/955/956/957/958/973/975/982/983), 112, 112.9 (except 112.960), 113, 119, 120, 137, 166, 601, 602 (except 602.98), 603, 604 (except /912), 605 (except 605.96), 606 (except 606.96)

General

The barometer of the weather station must be set to the air pressure as per the information from the local weather service.

The measured output value must be corrected with correction factors.

A distinction is made between 2 correction factors:

Altitude correction factor

Output correction factor

Output correction formula N eo = N e x K H

N eo = Output based on normal operating conditions in kW.

N e = Output measured on dynamometer in kW.

K H = Correction for intake air temperature, barometer reading and altitude of respective test location.

Calculation example

1 Read off air pressure, altitude and intake air temperature of test location from weather station.

Example:

Air pressure of test location =955 hPa (mbar)

Altitude of test location = 400 m

Intake air temperature of test location =+20 °C

2 Output determined on dynamometer = 100 kW

3 When the altitude value of the test location = 400 m, the altitude correction value in the altitude correction table is 46 hPa (mbar).

4 Air pressure of test location minus altitude correction factor equals air pressure value (p):

955 hPa (mbar) – 46 hPa (mbar) = 909 hPa (mbar)

To use the air pressure (p) in the table, it has to be rounded. In this example to 910 hPa.

5 Based on the air pressure (p) = 910 hPa, we read off a correction factor (KH) of 1.0787 from the output correction table at an intake air temperature (t) of 20 °C.

6 The output based on normal operating conditions is calculated as follows:

N eo = N e x K H

N eo = 100 kW x 1.0787 = 108 kW

Output on test stand: Ne = 100 kW

Air pressure of test location: P = 955 hPa (955 mbar)

Intake air temperature of

test location: t =+20 °C

Altitude of test location: 400 m above sea level

Units: hPa = Hectopascal

1 hPa = 1 mbar

1 Pa = 0.01 mbar