CDI driving mode, function

One of the basic tasks of Common-Rail Diesel Injection (CDI) in driving mode includes provision of an engine torque, which corresponds to the driver request. At the same time, CDI should provide for ideal smooth running characteristics at the lowest possible fuel consumption and minimal exhaust emissions. For this purpose, the CDI control unit (N3/9) must match the CDI and the air and exhaust system according to the stored performance map data. Other functions controlled by CDI via the CDI control unit in addition to driving mode:

 Sliding operation

 Boil protection

 Exhaust gas recirculation (EGR)

 Shutting of the refrigerant compressor (A9)

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For this purpose, the CDI control unit evaluates the following sensor data:

 The air mass drawn in and its temperature, via the hot film MAF sensor (B2/5) and the integrated intake air temperature sensor (B2/5b1)

 Current rail pressure from rail pressure sensor (B4/6)

 The actual boost pressure via the boost pressure sensor (B5/1)

 Coolant temperature from the coolant temperature sensor (B11/4)

 The charge air temperature via the charge air temperature sensor (B17/8)

 The vacuum in the intake manifold via the pressure sensor downstream of the air filter (B28/5)

 The driver request via the accelerator pedal sensor (B37)

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 Fuel temperature from the fuel temperature sensor (B50)

 Engine speed from the crankshaft position sensor (L5)

 The residual oxygen content in the exhaust via the O2 sensor upstream of TWC (G3/2)

 The load status of the diesel particulate filter (DPF) via the differential pressure sensor (DPF) (B28/8) on vehicles with code (474) particulate filter

 The exhaust gas temperature upstream of the turbocharger via the temperature sensor upstream of the turbocharger (B19/11), for vehicles with code (474) Particulate filter

 The exhaust gas temperature upstream of the DPF via the temperature sensor upstream of the diesel particulate filter (B19/9), on vehicles with code (474) particulate filter

The CDI control unit is connected to the glow time output stage (N14/3) via the Local Interconnect Network (LIN) and requests the following glow functions as required:

 Afterglowing

 DPF glowing on vehicles with code (474) particulate filter

Furthermore, the CDI control unit communicates with the following control units via the Control Area Network bus Class C (engine compartment) (CAN-C) to obtain the associated information on further variables:

 With the instrument cluster (A1), the winter tire maximum speed, the roll test mode Electronic Stability Program) (ESP)

 With the electronic selector lever module control unit (N15/5), selector lever position "P" or "N"

 With the ESP control unit (N47-5)

 With the EIS control unit (N73), the interface to the Control Area Network bus class B (interior) (CAN-B), e.g. switched status of the AC system

 With the fully integrated transmission control control unit (VGS) (Y3/8n4), actual gear engaged

 With the steering column module (N80), signals from the CC [TPM] switch (S40/4), signals from the left steering wheel gear shifter (S110/2) and right steering wheel gear shifter (S111/2)