Journal ArticleDOI
Modelling and optimizing two- and four-stroke hybrid pneumatic engines
Christian Dönitz,Iulian Vasile,Christopher H. Onder,Lino Guzzella +3 more
- Vol. 223, Iss: 2, pp 255-280
Reads0
Chats0
TLDR
In this paper, a four-stroke hybrid pneumatic engine configuration is presented, where fixed camshafts for both intake and exhaust valves are employed, and variable valve actuation for one charge valve per cylinder only.Abstract:
Hybrid pneumatic engines, which are designed to follow the downsizing and supercharging paradigm, offer a fuel-saving potential that is almost equal to that of hybrid electric powertrains while inducing much lower additional mass and cost penalties. This paper presents a systematic optimization of the operation of such an engine system. Both two-stroke and four-stroke modes are analysed. The optimized valve and throttle actuation laws for all modes and operating areas lead to generic maps that are independent of the engine size. So far, the pneumatic hybridization of internal combustion engines was thought to require two-stroke operation. This paper presents a novel hybrid pneumatic engine configuration that entails fixed camshafts for both intake and exhaust valves while utilizing variable valve actuation for one charge valve per cylinder only. This configuration is operated entirely in four-stroke modes. Such a configuration requires a careful optimization of its operating strategy to achieve its fuel economy potential. Compared with a full two-stroke operation, only small efficiency losses result from using four-stroke modes with these new operating strategies. Initial measurement results with such an engine system are presented in this paper to confirm the validity of the principles of operation.read more
Citations
More filters
Journal ArticleDOI
Road and track irregularities: measurement, assessment and simulation
TL;DR: In this article, the authors proposed a distance domain description method for road and track irregularities in the distance domain and in the wavelength domain, and compared with respect to their processing steps.
Proceedings ArticleDOI
Realizing a Concept for High Efficiency and Excellent Driveability: The Downsized and Supercharged Hybrid Pneumatic Engine
Journal ArticleDOI
Experimental Investigation on the Performance of a Compressed-Air Driven Piston Engine
TL;DR: In this paper, the authors used a test bench to examine the power performance and pressure/temperature variations of the compressed air engine at pressures ranging from 5 to 9 bar (absolute pressure).
Journal ArticleDOI
Application of Adaptive Sliding Mode Control for Regenerative Braking Torque Control
TL;DR: In this paper, a nonlinear control approach based on adaptive sliding-mode control (ASMC) is employed to tackle the problem of engine torque control during regenerative mode, and the results show that the controller performs remarkably well in terms of the robustness, tracking error convergence, and disturbance attenuation.
Journal ArticleDOI
Economic and environmental evaluation of compressed-air cars.
TL;DR: In this article, the authors analyze the thermodynamic efficiency of a compressed-air car powered by a pneumatic engine and consider the merits of compressed air versus chemical storage of potential energy.
References
More filters
Book
Introduction to Modeling and Control of Internal Combustion Engine Systems
TL;DR: In this paper, a cost-effective model-based control-system design for internal combustion engines (ICE) is presented, where the primary emphasis is put on the ICE and its auxiliary devices.
Journal ArticleDOI
Optimal Hybridization in Two Parallel Hybrid Electric Vehicles using Dynamic Programming
TL;DR: In this article, different hybridization ratios of two types of parallel hybrid electric vehicles, a torque assist parallel hybrid and a full parallel hybrid, with equal power-to-weight ratio were compared by their optimal fuel consumption for eight different drive cycles.
Proceedings ArticleDOI
An aging model of Ni-MH batteries for hybrid electric vehicles
TL;DR: In this article, an aging model suitable for applications in which the battery is used with no pre-defined cycles, as in the case of hybrid-electric vehicles, is presented.
Proceedings ArticleDOI
Using Camless Valvetrain for Air Hybrid Optimization
TL;DR: In this article, the authors explored the fuel economy potential of an air hybrid engine by presenting the modeling results of a 25L V6 spark-ignition engine equipped with an electrohydraulic camless valvetrain and used in a 4531 kg passenger car.