Despite the stringent emission requirements, engineers and technicians did not give up. Dr. Rolf Leonhard, head of Bosch's research and development department for diesel engine systems, believes that Bosch is actively preparing for such stringent emission requirements and is providing appropriate solutions at the right time. They mainly adopted measures to optimize the combustion technology of diesel engines:
Figure 1 In the red zone: Euro VI emission standards specify a narrow "observation hole" for particulate matter and NOx
1. In the case of partial load conditions, high supercharging pressure composes a very high utilization rate of AGR exhaust gas;
2. High diesel injection pressure is still used under partial load conditions;
3, flexible fuel injection process, 8 fuel injections during a work process.
The success of engineering technicians
Bosch's engineers and technicians have successfully achieved the established objectives: In the mass production of vehicles, all vehicles with Bosch diesel injection technology have significantly reduced NOx emissions and particulate emissions under various load conditions.
The very high supercharging pressure and diesel injection pressure, multiple injections during a working process, and AGR exhaust gas recycling and reuse are among the core features of the Bosch Diesel Engine Optimized Combustion Method (HCCI, Homogeneous Charge Compression Ignition). The particulates and NOx emitted by the diesel engine have been greatly reduced in diesel engines. The premise of realizing HCCI combustion is the correct gas mixture and the oil gas mixture that is evenly mixed in the combustion chamber. Therefore, a full-variable injection system is indispensable, which can ensure the pre-injection, main injection and supplementation of diesel at different times in a working process. injection.
At present, automotive engines that meet Euro V emission standards have been successfully developed, and this was difficult to accomplish several years ago. From 2009 onwards, we will be able to use DPF (diesel particle filter) to successfully control particulate emissions within the 0.003 g/km limit. The Euro VI emission standard, which is expected to be implemented in 2014, imposes stricter regulations on the emission of harmful substances from the engine, and in particular, the requirements for NOx emissions are nearly harsh. At that time, the engine's NOx emissions were only allowed to be 80μg/km, which is only 1/3 of the current standard, and the demand for engine particulate emissions was not changed much.
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