gf0715w4008a

Determination of the fuel temperature, function

Typ gf · téma 07.15 · verze 0102 · 2007-07-20

Platí pro: ENGINE 904.9 in MODEL 375.1 with BODY 375.830 ENGINE 904.9 in MODEL 970, 972, 975, 976 with BODY 972.899 ENGINE 906.9 in MODEL 970, 972, 974, 975, 976 with BODY 972.899 ENGINE 906.9 in MODEL 375.3 with BODY 375.810 ENGINE 906.9, 926.9 in MODEL 950, 952, 953, 954 with BODY 940.899

Není k dispozici v jazyce „cs“; zobrazeno v jazyce Angličtina.

Zařazení

Funkční skupina 1 Motor › 07 Příprava směsi › 07.15 Systém vstřikování paliva vznětového motoru (PLD), regulace motoru (MR) — Řada 375 (modely 1**, 3**, 810, 830) · Řada 904 (modely 9**) · Řada 906 (modely 9**) · Řada 940 (modely 899) · Řada 950 · Řada 952 · Řada 953 · Řada 954 · Řada 970 · Řada 972 · Řada 974 · Řada 975 · Řada 976

Platí také pro motory/převodovky: 926 9**

GF07.15-W-4008A

Determination of the fuel temperature, function

4.7.07

ENGINE 904.9 in MODEL 375.1 with BODY 375.830

ENGINE 904.9 in MODEL 970, 972, 975, 976 with BODY 972.899

ENGINE 906.9 in MODEL 970, 972, 974, 975, 976 with BODY 972.899

ENGINE 906.9 in MODEL 375.3 with BODY 375.810

ENGINE 906.9, 926.9 in MODEL 950, 952, 953, 954 with BODY 940.899

Determination of the fuel temperature, function

W07.15-1337-81

Shown on engine 906.9

A6 MR/PLD control unit

B10 Fuel temperature sensor

General

The properties of the fuel (volume, viscosity) change significantly with increases or decreases in temperature so it is essential to determine the fuel temperature, particularly for calculating the start of injection or start of delivery.

The fuel temperature is also an important factor for calculating the fuel quantity since one can obtain the actual mass of the fuel from this, which is turn is essential for specified engine torque correction.

Function

The fuel temperature is determined by the MR/PLD control unit (A6) from measurement values delivered by the fuel temperature sensor (B10).

There is a temperature-dependent resistance with a negative temperature coefficient (NTC) in the fuel temperature sensor (B10), an electrical resistance which reduces as the temperature increases. The voltage being applied to the MR/PLD control unit (A6) alters according to the temperature of the fuel, the value of which is the basis for calculating the fuel temperature.

The engine control (MR) control unit will work with replacement values if the fuel temperature sensor (B10) fails. This does, however, mean that optimum fuel consumption, pollutant emission levels etc. will no longer be achievable.

Fuel temperature sensor, location/task/design/function

GF07.04-W-4110A

MR/PLD control unit, location/task

GF07.15-W-4100B

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