TY - CHAP

T1 - Gaussian trajectories in motion control for camless engines

AU - Haus, Benedikt

AU - Mercorelli, Paolo

AU - Werner, Nils

N1 - Conference code: 21

PY - 2017/7/11

Y1 - 2017/7/11

N2 - In the last few years, variable engine valve control has attracted a lot of attention because of its ability to reduce pumping losses and increase torque performance over a wider speed and load range. Variable valve timing also allows control of internal exhaust gas recirculation, thus improving fuel economy and reducing NOx emissions. One of the most important issues in this context is to track suitable variable (optimized in terms of engine speed and load) motion profiles for the intake and exhaust valves. This can be achieved using dedicated actuators for the valves instead of a traditional camshaft. This contribution considers a new kind of actuator for this purpose and its control for motion tracking in the context of camless systems. However, this paper's main intention is to introduce a method of generating variable engine valve trajectories that are based on Gaussian curves and exemplarily provide the reader with information on how to exploit their favorable mathematical properties for control design purposes. As a demonstration of this kind of curve's variability, a delay-compensating phase-adaptive feedforward action is derived from a linear model description of the actuator. Simulations show the effectiveness of a simple heuristic delay-estimation algorithm in combination with the mentioned feedforward action.

AB - In the last few years, variable engine valve control has attracted a lot of attention because of its ability to reduce pumping losses and increase torque performance over a wider speed and load range. Variable valve timing also allows control of internal exhaust gas recirculation, thus improving fuel economy and reducing NOx emissions. One of the most important issues in this context is to track suitable variable (optimized in terms of engine speed and load) motion profiles for the intake and exhaust valves. This can be achieved using dedicated actuators for the valves instead of a traditional camshaft. This contribution considers a new kind of actuator for this purpose and its control for motion tracking in the context of camless systems. However, this paper's main intention is to introduce a method of generating variable engine valve trajectories that are based on Gaussian curves and exemplarily provide the reader with information on how to exploit their favorable mathematical properties for control design purposes. As a demonstration of this kind of curve's variability, a delay-compensating phase-adaptive feedforward action is derived from a linear model description of the actuator. Simulations show the effectiveness of a simple heuristic delay-estimation algorithm in combination with the mentioned feedforward action.

KW - Engine applications

KW - servo hydraulic systems

KW - trajectory generation

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=85027519053&partnerID=8YFLogxK

U2 - 10.1109/PC.2017.7976192

DO - 10.1109/PC.2017.7976192

M3 - Article in conference proceedings

AN - SCOPUS:85027519053

SN - 978-1-5386-4012-8

SP - 76

EP - 80

BT - Proceedings of the 2017 21st International Conference on Process Control (PC)

A2 - Fikar, M.

A2 - Kvasnica, M.

PB - IEEE - Institute of Electrical and Electronics Engineers Inc.

T2 - 21st International Conference on Process Control - PC 2017

Y2 - 6 June 2017 through 9 June 2017

ER -