Diesel pressure departure ratio algorithm for combustion feedback and control

Abstract

The pursuit for higher efficiency and ultra-low exhaust emissions from diesel engines requires the combustion process to be precisely controlled so as to minimize departures from the intended engine operation. The combustion control system must be able to perform corrective actions on a cycle-by-cycle basis, with a robust feedback on the combustion process. The combustion phasing, commonly represented by the crank angle of 50% heat release and derived from the measured cylinder pressure data, shows a strong correlation to the efficiency and the engine-out nitrogen oxide emissions. To accurately estimate the combustion phasing from the derived heat-release rate, the authors previously introduced and experimentally validated a computationally efficient diesel pressure departure ratio algorithm, against selected cases of boost, engine load and exhaust gas recirculation. In this work, the formulation of the pressure departure ratio algorithm is presented in detail along with its implementation to enable combustion control during both transient and steady-state engine operations. Engine tests demonstrate that the algorithm was effective in stabilizing the combustion process on a cycle-by-cycle basis for a range of engine speeds, load and exhaust gas recirculation, which included conventional and low-temperature diesel combustion modes.

Fast and robust adaptation of lookup tables in internal combustion engines: feedback and feedforward controllers designed independently

“…This issue is discussed in this section using the NLMS algorithm presented previously Combining (2), (7) and (8) leads to the following recursion of the adaptive feedforward controller:…”

“…These indicators are used as the plant output in order to enable feedback control. In-cylinder pressure feedback control finds application in classical spark-ignition engines 5,6 and compression ignition engines, 7,8 but also in advanced combustion concepts. [9][10][11][12] Control is an important topic for modern internal combustion engines and will even become more important as the systems are getting more complex in the future.…”

Innovative Control Strategies for the Diagnosis of Injector Performance in an Internal Combustion Engine via Turbocharger Speed

“…The reliability and efficiency of internal combustion engines make them the most applied technology solution throughout the world in multiple roles, such as transport, power generation, and industrial application. In order to guarantee a high level of performance and to comply with challenging new regulations, continuous supervision of engine operating conditions is needed (e.g., [1,2]), with particular reference to fuel consumption [3], combustion control [4], and pollution emissions [5,6]. To this end, the monitoring of the engine's thermodynamic cycle is the most suitable approach.…”

Fast and robust adaptation of lookup tables in internal combustion engines: feedback and feedforward controllers designed independently

“…These indicators are used as the plant output in order to enable feedback control. In-cylinder pressure feedback control finds application in classical spark-ignition engines 5,6 and compression ignition engines, 7,8 but also in advanced combustion concepts. 9–12…”