Due to increasing climate awareness and the introduction of much stricter exhaust emission legislation the internal combustion engine technology faces major challenges. Although the development and state of technology of internal combustion engines generally reached a very high level over the last years those need to be improved even more. Combining water injection with a diesel engine, therefore, seems to be the next logical step in developing a highly efficient drive train for future mobility. To investigate these potentials, a comprehensive evaluation of water injection on the diesel engine was carried out. This study covers >560 individual operating points on the test bench. The tests were carried out on a single-cylinder derived from a Euro 6d four-cylinder passenger car with the port water injection. Furthermore, a detailed pressure trace analysis (PTA) was performed to evaluate various aspects regarding combustion, emission, etc. The results show no significant effects of water injection on the combustion process, but great potential for NO_x reduction. It has been shown that with the use of water injection at water-to-fuel rates of 25%, 50%, and 100%, NO_x reduction without deterioration of soot levels can be achieved in 62%, 40%, and 20% of the experiments, respectively. Furthermore, water injection in combination with EGR offers additional reduction in NO_x emissions.

由于气候意识的提高和更严格的废气排放法规的引入，内燃机技术面临着重大挑战。尽管内燃机的发展和技术水平在过去几年中普遍达到了很高的水平，但还需要进一步改进。因此，将水喷射与柴油发动机相结合似乎是为未来移动开发高效传动系统的下一个合乎逻辑的步骤。为了研究这些潜力，对柴油发动机的注水进行了综合评估。这项研究涵盖了测试台上 560 个以上的独立工作点。测试是在源自欧 6d 四缸客车的单缸上进行的，带有端口注水。此外，_x减少。已经表明，通过在 25%、50% 和 100% 的水燃料比下使用注水，可以在 62%、40% 和 20% 的情况下实现NO _x减少而不降低烟尘水平的实验，分别。此外，注水与 EGR 相结合可进一步减少 NO _x排放。