Component Description For The Differential Pressure Sensor (DPF) - GF07.04-D-6122HD
ENGINES 651.955/956/957 in MODEL 906
with CODE (XZ1) Model generation 1
with CODE (MZ0) Blue EFFICIENCY
Location
Shown on model 906, view of the engine from the rear
The diesel particulate filter differential pressure sensor is located at the rear right in the area of the cylinder head.
Task
The diesel particulate filter differential pressure sensor detects the exhaust pressure upstream and downstream of the diesel particulate filter (DPF) and determines the pressure differential.
The CDI control unit (N3/28) uses the pressure differential to determine the soot and ash contents in the DPF for the oxicat diesel particulate filter device.
Input and output signals
Direct input signals
- Supply voltage of CDI control unit
Direct output signals
- Sensor signal at CDI control unit
Design
The diesel particulate filter differential pressure sensor consists of a piezoresistive pressure sensor element, an electronic circuit for signal amplification and a temperature compensation circuit. All components are integrated in a silicon chip. The silicon chip is protected from corrosion by a protective gel and is cast in a plastic housing.
Function
the DPF differential pressure sensor detects the exhaust pressure upstream and downstream of the DPF over the exhaust gas pressure lines upstream and downstream of the DPF and determines the pressure differential.
The upstream and downstream of the DPF acts on the piezoresistive pressure sensor element.
This generates a voltage which is amplified by the integrated silicon chip and sent as a sensor signal to the CDI control unit.