From the fourth national emission upgrade to the national five, or even the country six, the most important thing is to continue to reduce the nitrogen oxides (NOX) and carbon particles (PM) in the tail gas composition. These reductions will bring greater challenges to the post-processing system manufacturers. In response to this, Bosch has its own technological advantages in the emission upgrades of China Five and Sixth, and uses integrated exhaust treatment solutions to create a tail gas post-processing system that meets China's road transportation conditions with a large amount of experimental data.

Coordinate and provide integrated solutions

Xiao Haodong, director of the Bosch Automotive Diesel Systems Co., Ltd. spare parts development center, once said at the 8th Asian Engine Emissions Summit in 2015: “The catalytic performance of the SCR exhaust gas aftertreatment system depends not only on the quality of the catalyst but also on the mixing of fuel and air. Concentration, degree of atomization of urea solution and catalytic proportion of DOC tail gas treatment system are related.” In response, Bosch Group regards heat preservation of exhaust pipe, EGR control, mixing uniformity of gas flow and ammonia, selection of SCR catalyst, DOC, and catalyst carrier Volume and other factors have been studied.

Director of Parts Development Center of Bosch Automotive Diesel Systems Co., Ltd. Xiao Haodong

In terms of tail gas emission generation, the Bosch Group controls the ratio between nitrogen oxides (NOX) and particulate emissions (PM) through the cooperation of high-pressure common rail system and EGR post-treatment system to achieve SCR+DOC+DPF, SCR +lightEGR+DOC+DPF and SCR+mediumEGR+DOC+DPF are combined with three Euro 6 post-processing solutions to suit different vehicle operating conditions.

In the treatment of exhaust emissions, the Bosch Group's match between the vehicle model and the DOC treatment system resulted in a 1:1 ratio of NO to NO2 emitted by the DOC, thereby realizing the three catalysts of vanadium-based, iron-boiling, and copper-based catalysts. When the temperature of the trachea reaches 250, the same catalytic efficiency can be achieved for the single oxide, and the cost of purchasing and using the vehicle under different working conditions can be reduced.

Bosch's research on the DOC system

In terms of the uniformity of the mixing of the gas flow with ammonia and the size of the catalytic carrier, the Bosch Group achieves the maximum catalytic efficiency with a minimum carrier volume by adjusting the injection pressure of the urea nozzle, the penetration distance, the injection angle and the shape of the exhaust pipe. Or avoid the clogging of urea nozzles and reduce the cost of car purchases and car use.

Field testing of precision farming in China market

According to the characteristics of the wide use of commercial vehicles in China and the complex operating conditions, the Bosch Group has taken the following measures.

The calibration of large and medium cities draws on Europe. Since China's large and medium-sized cities have basically the same vehicle operating conditions as European cities, there are precedents for China to find DPF and engine matching. As the oil becomes thinner during use, its combustion volume will also increase day by day. The metal element additives contained in the engine oil require a large amount of directional calibration in the DPF system without HCL.

Calibration of field measurements in low pressure areas. In view of China's vast geographical area and complex working conditions of vehicles, the Bosch Group has tailored many field calibration experiments for DPF carbon load regeneration targets in areas with relatively low atmospheric pressure such as cold and high plateau in China, and strives for vehicles in all terrain and climate. The working environment maintains normal discharge.

Bosch Group's research on DPF

Characteristic models set special standards. Compared with light trucks in other countries, China's light trucks have low power density and low emission temperature. The Bosch Group has added special catalytic materials when formulating DOC post-processing systems that meet China's requirements. Taking into account the different operating conditions of regional diesel sulfur content in China, the Bosch Group has made special treatment in the engine calibration process in addition to the conventional active regeneration DPF and passive regeneration DPF systems. Specially calibrated engine exhaust system can help the rapid formation of sulfur in sulfur in the tail gas, so that it can be burned off in time during the regeneration of DPF without affecting the next working cycle.

In today's increasingly exhaust emission standards, only the system, practical problem solutions can meet the user's favor. The Bosch Group is systematically and practically applying scientific solutions to the China commercial vehicle exhaust emission aftertreatment system supply market.

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