Attenuation reference model based adaptive speed control tactic for automatic steering system

To reduce the adverse effect of the functional insufficiency of the steering system on the accuracy of path tracking, a path tracking approach considering safety of the intended functionality is proposed by coordinating automatic steering and differential braking in this paper. The proposed method adopts a hierarchical architecture consisting of a coordinated control layer and an execution control layer. In coordinated control layer, an extension controller considering functional insufficiency of the steering system, tire force characteristics and vehicle driving stability is proposed to determine the weight coefficients of automatic steering and the differential braking, and a model predictive controller is designed to calculate the desired front wheel angle and additional yaw moment. In execution control layer, a H∞ steering angle controller considering external disturbances and parameter uncertainty is designed to track desired front wheel angle, and a braking force distribution module is used to determine the wheel cylinder pressure of the controlled wheels. Both simulation and experiment results show that the proposed method can overcome the functional insufficiency of the steering system and improve the accuracy of path tracking while maintaining the stability of the autonomous vehicle.

Download Full-text

Bi-directional and targeted AMI: Reference model based on internet-of-things

2013 IEEE International Symposium on Consumer Electronics (ISCE) ◽

10.1109/isce.2013.6570164 ◽

2013 ◽

Author(s):

Hsiang-Yuan Hsueh ◽

Chen-Yu Lee ◽

Wen-Chiuan Liao ◽

Ko-Li Kan

Keyword(s):

Internet Of Things ◽

Reference Model ◽

Model Based

Download Full-text

Research on Power Regulation Schedule Control System for Turboprop Engine

International Journal of Turbo and Jet Engines ◽

10.1515/tjj-2018-0023 ◽

2018 ◽

Vol 0 (0) ◽

Author(s):

Tianqian Xia ◽

Xianghua Huang

Keyword(s):

Control System ◽

Steady State ◽

Fuel Consumption ◽

Reference Model ◽

Sliding Mode ◽

Speed Control ◽

Variable Speed ◽

Turboprop Engine ◽

Speed Control System ◽

Variable Speed Control

Abstract A method of variable speed control system for turboprop engine is presented in this paper. Firstly, the steady operation state of turboprop engine is analyzed, and the operating line is figured out in the steady state characteristic diagram, which is the design basis of Engine Thrust Management System (ETMS). Secondly, the reference model sliding mode multivariable control is used to design the control law to follow the speed instructions given by ETMS. Finally, the optimization of the minimum fuel consumption operating curve is realized, and the control system designed is applied to a numerical model of a turboprop engine. The simulation results show that compared with the constant speed control system, the variable speed control system can reduce the specific fuel consumption by 2.37 % on average and 3.1 % in steady state conditions. Furthermore, the method can enable the pilot to manipulate the turboprop aircraft by using only one throttle lever, which can greatly reduce the pilot operation burden.

Download Full-text