Electronic Control Units/Overview 　 Electronic Control Units   This high-power microcontroller for the Motronic/DI-Motronic electronic engine-management systems controls the cylinder charge, the gasoline injection, and the ignition. Sensors register the operating status and all the relevant influencing variables. Deviations in emissions behavior are immediately detected by the integrated On-Board Diagnostics (OBD). The ETC/EGAS system: 1 Accelerator-pedal module, 2 Engine-management ECU, 3 Throttle device Characteristics 1. Software: Shorter development times thanks to automated code generation 2. Mechanics/plug: More efficient thermal management than preceding generation 3. Uniform platform for gasoline and diesel-engine management 4. Hardware: Computer power double that of preceding generation. High levels of integration are consistently pursued 　 Function ETC/EGAS components: 1 Accelerator-pedal module, 2 Throttle device, 3 Engine-management ECU The ETC electronic throttle control (also known as drive-by-wire), comprises throttle device, accelerator-pedal module, and ECU. It adapts the engine torque to the driver's accelerator-pedal input and to the operating parameters of engine and gearbox. Thanks to ETC, such safety systems as ESP are able to reduce torque rapidly and precisely, without causing any increases in emissions. With the advent of EDC it became possible to implement more innovative functions. These allow the diesel engine equipped vehicle to satisfy customer demands for comfort and convenience, dynamic performance, fuel economy, and low emissions. In addition, the ECU permits on-board diagnostics (OBD) and communication with other ECU's in the vehicle. Basic design of the ECU is the same for both, passenger cars and commercial vehicles, but the construction various by the application. Supplementary functions can be integrated either as hardware or as software.