The differential pressure sensor measures the pressure drop between two points in the flow pattern and is used at two different points in the exhaust manifold. At one point it reports the charge status of the particle filter and monitors its function. At the other point it is used to control the low-pressure exhaust gas recirculation.
Precise sensor measurement allows demand-controlled regeneration of the diesel particulate filter to save fuel
Monitoring of the particulate filter charge
Control of the low-pressure exhaust gas recirculation rate