Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 36
Book Description
Measurement of Diesel Engine Emissions During Transient Operation
Author: Diesel Engine Transient Operation
Author: Constantine D. RakopoulosPublisher: Springer Science & Business Media
ISBN: 1848823754
Category : Technology & Engineering
Languages : en
Pages : 408
Book Description
Traditionally, the study of internal combustion engines operation has focused on the steady-state performance. However, the daily driving schedule of automotive and truck engines is inherently related to unsteady conditions. In fact, only a very small portion of a vehicle’s operating pattern is true steady-state, e. g. , when cruising on a motorway. Moreover, the most critical conditions encountered by industrial or marine engines are met during transients too. Unfortunately, the transient operation of turbocharged diesel engines has been associated with slow acceleration rate, hence poor driveability, and overshoot in particulate, gaseous and noise emissions. Despite the relatively large number of published papers, this very important subject has been treated in the past scarcely and only segmentally as regards reference books. Merely two chapters, one in the book Turbocharging the Internal Combustion Engine by N. Watson and M. S. Janota (McMillan Press, 1982) and another one written by D. E. Winterbone in the book The Thermodynamics and Gas Dynamics of Internal Combustion Engines, Vol. II edited by J. H. Horlock and D. E. Winterbone (Clarendon Press, 1986) are dedicated to transient operation. Both books, now out of print, were published a long time ago. Then, it seems reasonable to try to expand on these pioneering works, taking into account the recent technological advances and particularly the global concern about environmental pollution, which has intensified the research on transient (diesel) engine operation, typically through the Transient Cycles certification of new vehicles.
Comparison of Predicted and Measured Diesel Exhaust Emission Levels During Transient Operation
Author: Timothy J. CallahanPublisher:
ISBN:
Category : Coal mines and mining
Languages : en
Pages : 8
Book Description
Experimental Investigation of Transient Operation and Low Temperature Combustion in a Light Duty Diesel Engine
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Detailed and highly time resolved experimental measurements were used to characterize the effects of transient operation on the performance of a light duty diesel engine, and to identify the physical processes responsible for transient-specific combustion behavior. The engine response to transient events varied with the size and type of transition and the combustion strategy used, but the underlying processes were similar in all cases. Differences in the response rate of the fuel and air systems caused large variations in the equivalence ratio of the combustion charge during transient events. For moderate to low load conditions, this was primarily due to the discrepancy between the instantaneous intake air flow rate and the composition of the intake charge caused by storage of exhaust gas in the EGR system. This effect was particularly significant for early injection LTC operation due to higher EGR rates and greater dependence of combustion phasing on intake charge composition. Individual combustion cycles during transient events were compared to steady state operation at the same speed and load to quantify the differences in physical conditions. The greatest effect on combustion and emissions was due to differences in intake charge composition, which varied significantly between transient and steady state operation. The response time of the common rail pressure also contributed to transient behavior in situations where the target pressure varied with changes in speed or load. During larger load transitions, thermal inertia of the engine system had a significant effect on emissions, particularly UHC, but did not influence the combustion phasing or heat release rate. The characteristic rates of change of the charge gas, fluid, and physical component temperatures in response to speed or load transitions were much slower than those of other variables such as pressures or flow rates, and were consistent with concurrent variations in engine-out emissions levels. Numerous mechanisms by which thermal inertia could affect emissions formation were identified, including variation of the intake manifold charge gas temperature, in-cylinder heat transfer, and changing physical properties of the fuel.
The Effects of Fuel Additives on Diesel Engine Emissions During Steady State and Transient Operation
Author: John NuszkowskiPublisher:
ISBN:
Category : Diesel fuels
Languages : en
Pages :
Book Description
Transient Diesel Emissions: Analysis of Engine Operation During a Tip-In
Author: Jonathan R. HagenaInterpreting Measurements of Hydrocarbon Emissions from a Diesel Engine Under Steady and Transient Operating Conditions
Author: Richard GardinerPublisher:
ISBN:
Category : Diesel motor exhaust gas
Languages : en
Pages : 294
Book Description
Measurements of Exhaust Emissions During Transient Engine Operations
Author: Hoong Gheow WongPublisher:
ISBN:
Category : Internal combustion engines
Languages : en
Pages :
Book Description
Measuring and Predicting Transient Diesel Engine Emissions
Author: Anders WestlundTime Series Analysis of Diesel Exhaust Gas Emissions Under Transient Operation
Author: Noboru MiyamotoPublisher:
ISBN:
Category : Diesel motor exhaust gas
Languages : en
Pages : 8
Book Description