When do open-loop strategies for combustion control work?
نویسنده
چکیده
This paper addresses open-loop control strategies that involve a low frequency modulation of the fuel injection for suppression of pressure oscillations in combustion systems. Such a strategy has been employed in a number of recent investigations including [1]-[5]. Using a physically based model, analytical explanations for the effectiveness of such a low pulsing strategy are provided in this paper. Conditions are derived on the frequency and the duty-cycle used in the control strategy that lead to stabilization in the combustor, under ideal and nonideal switching strategies, and in the presence of hysteresis.
منابع مشابه
Controlling the Power Output and Combustion Phasing in an HCCI Engine
In development of Homogeneous Charge Compression Ignition (HCCI) engines, simultaneous control of combustion phasing and power output has been a major challenge. In this study, a new strategy is developed to control the engine power output and combustion phasing at any desired operating condition. A single zone thermodynamic model coupled to a full kinetic mechanism of Primary Reference Fuels (...
متن کاملFeedback control of combustion instabilities from within limit cycle oscillations using H∞ loop-shaping and the ν-gap metric
Combustion instabilities arise owing to a two-way coupling between acoustic waves and unsteady heat release. Oscillation amplitudes successively grow, until nonlinear effects cause saturation into limit cycle oscillations. Feedback control, in which an actuator modifies some combustor input in response to a sensor measurement, can suppress combustion instabilities. Linear feedback controllers a...
متن کاملDynamic Load Carrying Capacity of Mobile-Base Flexible-Link Manipulators: Feedback Linearization Control Approach
This paper focuses on the effects of closed- control on the calculation of the dynamic load carrying capacity (DLCC) for mobile-base flexible-link manipulators. In previously proposed methods in the literature of DLCC calculation in flexible robots, an open-loop control scheme is assumed, whereas in reality, robot control is achieved via closed loop approaches which could render the calculated ...
متن کاملTransient combustion control of internal combustion engines
This thesis addresses the problem of combustion control for automotive engines. A method is proposed to complement existing controllers, which use lookup tables based on steady-state operation. During transients, the new control method adjusts fast control variables (ignition or injection time) to compensate for deviations in the cylinder initial conditions from their optimal values due to the ...
متن کاملModel-based Feedback Control for an Automated Transfer out of Si Operation during Si to Hcci Transitions in Gasoline Engines
This paper takes a first step towards model-based feedback control for the transition between spark ignition (SI) and homogeneous charge compression ignition (HCCI) combustion modes by approaching the transfer out of SI operation during the SI into HCCI transition in a closed-loop control framework. The combustion mode switch is taken to be directly from SI to HCCI without an intermediate combu...
متن کامل