Control of diesel engines using NO_x-emission feedback

Abstract

Variations of engine-out emissions due to ageing, component drift or production tolerances pose serious problems to meet legislative restrictions on exhaust tailpipe pollutant emissions. This paper addresses feedback of the raw emissions for improved control of diesel engines. A discussion of issues regarding the inclusion of raw-emission feedback into the engine control structure is provided, and a novel control structure for combined feedback control of the air-path variables boost pressure and exhaust gas recirculation rate and of the NO x emissions is presented. The proposed control structure basically consists of an optimal linear output feedback controller and a setpoint-adaption loop on the exhaust gas recirculation rate. With this approach, a simple control structure is available requiring a marginal calibration effort to meet desired NO x -emission values. Unfavourable injection timing in connection with NO x control is minimized by adapting the exhaust gas recirculation rate setpoint. The performance of the proposed approach is demonstrated by experimental results.

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

“…The resulting signal has the typical square-wave shape (see Figure 7). The instantaneous TC speed on time base is obtained from the time interval (∆Time) between two consecutive rising edges (or falling edge) of the signal and it is associated with the average time of the interval, as shown in Equation (6), where N blades is the number of compressor blades.…”

“…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.…”

A New Approach for NOx Soft Sensors for the Aftertreatment of Diesel Engines

“…Hence, concentration [2,3] as control ensors that monitor these controlled variables as feedback controllers. Instead, a concentration from state quantities of engine accuracy of the sensor improve the accuracy dy state.…”

Zero-dimensional modelling of a four-cylinder turbocharged diesel engine with variable compression ratio and its effects on emissions

“…Although new technologies like the control methods, exhaust gas recirculation (EGR), and variable valve timing (VVT), have helped to reduce the NOx and soot emissions considerably [1][2][3][4][5][6][7][8], further measures are to be taken to meet the increasingly restrictive emission standards. It is of no contradiction that diesel engines are in the top list to face emission limitations in near future and the trade-offs between NOx-CO 2 -Soot emissions must be handled without compromising on the performance outputs [9,10].…”