gf4920w3003h

Exhaust temperature sensor upstream of diesel oxidation catalytic converter, component description

Type gf · emne 49.20 · version 0101 · 2012-06-04

Gælder for: ENGINES 470.9 in MODEL 963, 964 with CODE (M5Z) Engine version Euro VI ENGINES 471.9 in MODEL 963, 964 with CODE (M5Z) Engine version Euro VI

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Placering

Funktionsgruppe 1 Motor › 49 Udstødningssystem, udstødningsrensning › 49.20 Udstødningsefterbehandling — Serie 470 (modeller 9**) · Serie 471 (modeller 9**) · Serie 963 · Serie 964

GF49.20-W-3003H

Exhaust temperature sensor upstream of diesel oxidation catalytic converter, component description

10.5.12

ENGINES 470.9 in MODEL 963, 964 with CODE (M5Z) Engine version Euro VI

ENGINES 471.9 in MODEL 963, 964 with CODE (M5Z) Engine version Euro VI

Exhaust temperature sensor upstream of diesel oxidation catalytic converter, component description

W14.40-1579-76

Location

1 Exhaust aftertreatment unit:

B67 Exhaust temperature sensor upstream of diesel oxidation catalytic converter

Task

Via the exhaust temperature sensor upstream of the diesel oxidation catalytic converter (B67), the exhaust aftertreatment control unit (ACM) (A60) records the temperature of the exhaust flow in the deflection chamber upstream of the diesel oxidation catalytic converter (DOC).

Design

The sensor consists of a stainless steel housing. The inside contains a measuring element, a PTC resistor. PTC stands for "Positive Temperature Coefficient" and means that the electrical resistance increases as the temperature increases.

Function

The exhaust blowing by the sensor influences the measuring element on the inside depending on its temperature and leads to a change in its electric resistance.

Since the sensor has a constant measuring current flowing through it, the resistance change causes a voltage drop, via which the exhaust aftertreatment control unit (ACM) (A60) can work out the associated temperature value.