The meaning of ECU is basically the same as that of door control unit (ECU) of family car. The main difference is that small cars are basically EFI gasoline engines, so they are called ECU. The truck uses EFI high-pressure rail diesel engine.
Principle of DCU control unit:
The urea injection control unit (DCU) knows the state of the vehicle in real time through sensors, and accurately controls the work of each actuator in real time through software calculation, so as to realize the accurate control of each system of the vehicle. It can be integrated in Bosch EDC 17CV electronic control unit.
Diesel selective catalytic reduction system (SCR) is used to remove nitrogen oxides from diesel engine emissions.
In the high temperature environment, the urea injection unit injects urea aqueous solution into the exhaust pipe, and urea releases ammonia at high temperature. Ammonia reacts with nitrogen oxides in exhaust gas in SCR catalyst to regenerate nitrogen and water, so as to reduce the emission of nitrogen oxides from diesel engine.
Extended data:
The DCU control unit includes:
Central interface panel (PSC), local control panel (PSL), door control unit (DCU), motor and screen door power supply system, etc.
Functions of DCU control unit:
Like an ordinary computer, it consists of a microprocessor (MCU), a memory (ROM, RAM), an input/output interface (I/O), an analog-to-digital converter (A/D) and a large-scale integrated circuit such as shaping and driving. To describe it in a simple sentence is "ECU is the brain of a car".
self-diagnostic function
DCU generally has the functions of fault self-diagnosis and protection. When the system fails, it can also automatically record the fault code in RAM, and take protective measures to read the replacement program from the above-mentioned inherent program to maintain the engine running. At the same time, these fault information will be displayed on the dashboard and will be immortal, so that the owner can find the problem in time and drive the car to the repair shop.
Adaptive function
Under normal circumstances, RAM will constantly record your driving data, which is a learning program of DCU to provide the best control state to adapt to your driving habits. This program is also called adaptive program.
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