It is crucial for the diesel particulate filter (DPF) that the exhaust temperature at the DPF inlet is well managed and accurately controlled during the thermal regeneration process, in order to ensure the integrity of the filter and improve regeneration efficiency simultaneously. However, this is challenging because the DPF and the upstream diesel oxidation catalyst are complex systems with complicated chemical, thermal and fluid phenomena, especially in real-world driving where the operation and environment conditions are varying and unpredictable. In some cases when the engine speed is suddenly dropped to idle (DTI) from normal operation conditions, uncontrolled regeneration events may occur and result in excessive temperature spikes inside the DPF that may melt down the filter. The objective of this work is to improve safe, reliable and efficient filter operation during the DPF thermal regeneration process, thus reducing the risk of destructive melting of the DPF. Firstly, an experimental method based on the DTI regeneration tests is investigated under a wide range of operation conditions with different soot load levels and regeneration temperatures. Results indicate that the target regeneration temperature curve can be derived as an empirical function of the amount of soot loading in the DPF, which is essential to ensure regeneration safety of the filter in runtime. Then, a novel control strategy combining a model-based feedforward control law and a feedback control law based on the internal model control approach is proposed and developed. The presented control strategy is finally validated under transient conditions in the real driving cycles. Results show that the temperature overshoot is less than 5% during the initial regeneration control stage and the tracking error remains within ± 15 °C of the target regeneration temperature, which is beneficial to safe and efficient thermal regenerations of the filter.

对于柴油机微粒过滤器（DPF）而言，至关重要的是，在热再生过程中，必须对DPF入口处的排气温度进行良好的管理和精确控制，以确保过滤器的完整性并同时提高再生效率。但是，这是具有挑战性的，因为DPF和上游柴油氧化催化剂是具有复杂的化学，热和流体现象的复杂系统，尤其是在操作和环境条件变化且不可预测的实际驾驶中。在某些情况下，当发动机转速从正常运行条件突然降至怠速（DTI）时，可能会发生不受控制的再生事件，并导致DPF内部温度过高而导致过滤器融化。这项工作的目的是提高安全性，DPF热再生过程中可靠而有效的过滤器操作，从而降低了DPF破坏性熔化的风险。首先，研究了一种基于DTI再生测试的实验方法，该方法在多种运行条件下，具有不同的烟尘负荷水平和再生温度。结果表明，目标再生温度曲线可以作为DPF中烟尘负载量的经验函数得出，这对于确保过滤器在运行时的再生安全性至关重要。然后，提出并开发了一种基于内部模型控制方法的基于模型的前馈控制律和反馈控制律相结合的新型控制策略。所提出的控制策略最终在实际驾驶循环中的瞬态条件下得到验证。