Abstract
A system with independent, early inlet valve closure (EIVC) has been analysed. The open, theoretical cycle has been assumed as a model of processes proceeding in the engine with variable inlet valve actuation. The system has been analysed individually and comparatively with open Seiliger-Sabathe cycle which is theoretical cycle for the classic throttle governing of engine load. The influence of EIVC on fuel economy, cycle work, relative charge exchange work and cycle efficiency has been theoretically investigated. The use of the analysed system to governing of an engine load will enable to eliminate a throttling valve from inlet system and reduce the charge exchange work, especially within the range of partial load. The decrease of the charge exchange work leads to an increase of the internal and effective works, which results in an increase of the effective efficiency of the spark ignition engine.
Highlights
Realization of a charge exchange process in a combustion engine requires surmounting flow resistances in inlet and exhaust systems so execution of an adequate work co-called the charge exchange work
Each element installed in the charge exchange system generates flow resistance of a fresh charge in a intake system and combustion products in a exhaust system
These resistances bring about an increase of the charge exchange work which contributes to a decrease of the internal and the effective work of an engine
Summary
Realization of a charge exchange process in a combustion engine requires surmounting flow resistances in inlet and exhaust systems so execution of an adequate work co-called the charge exchange work. Each element installed in the charge exchange system generates flow resistance of a fresh charge in a intake system and combustion products in a exhaust system These resistances bring about an increase of the charge exchange work which contributes to a decrease of the internal and the effective work of an engine. Increasing the energy efficiency of an internal combustion engine with spark ignition is possible by eliminating the throttle This may be accomplished by using fully independent control of intake or/and exhaust valves [3,4,5]. The use of the independent inlet valve actuation has been proposed in order to increase of efficiency of the open, ideal cycle and effective efficiency of the spark-ignition engine [2]. The open Seiliger-Sabathe cycle (presented in Fig. 1) is the reference cycle for an assessment of advantages and effectiveness of work gaining in consequence of application of the early inlet valve closure [4, 5]
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