Engine exhaust gas emissions from non-road mobile machinery

Non-road mobile machinery is used for a range of different operations with varying engine load characteristics. Fuel consumption and emission amounts from such machinery are dependent on the operation performed. The engine load during many of the operations performed is largely transient in nature. However, the majority of fuel consumption and emission data reported in the literature are based on static measurements and engine load patterns not representative of the real use of the vehicle. Emission data derived from the average annual use of agricultural tractors, based on three different typical areas of use, were compared with emission data obtained from European and international standards. The results showed that the emission amounts obtained from the engine load cycles stipulated in European and international emissions regulations were not representative of the real use of non-road mobile machinery. Furthermore, operations can be performed using a variety of different approaches depending on factors such as vehicle characteristics and driver behaviour. An engine load simulation model was developed and the results from the simulations showed that by using different driving strategies or transmission characteristics, it was possible to affect the emissions for a specific operation without affecting the fuel consumption or duration of the operation. Changes in engine speed and torque, i.e. transients, are likely to affect the fuel consumption and formation of emissions due to periods of time lags in e.g. the fuel injection system or the boost pressure. During normal operations a decrease in the fuel efficiency due to transient loads was detected. The fuel consumption increased with up to 13% compared with the corresponding steady-state condition. In order to study the effects of transients, special transient test cycles were developed. At high transients, both in engine speed and torque, the effects on fuel consumption and emissions were substantial. For example emissions of particulate matter increased with up to twelve times. Based on these results, a mathematical model was developed that could derive transient fuel consumption and emission amounts for all types of operations using a limited amount of emission measurements.

[1]  D. B. Tinker.  Integration of Tractor Engine, Transmission and Implement Depth Controls: Part 1, Transmissions , 1993 .

[2]  Jaime E. Sauerteig,et al.  Present and Future European Exhaust Emission Regulations for Off-Road Diesel Engines , 1991 .

[3]  H G Neumann,et al.  Health risk of combustion products: toxicological considerations. , 2001, Chemosphere.

[4]  H. D. Harris.  Prediction of tractor engine performance using OECD Standard Test data , 1992 .

[5]  N. Clark,et al.  Models for Predicting Transient Heavy Duty Vehicle Emissions , 1998 .

[6]  Magnus Lindgren,et al.  Jordbruks- och anläggningsmaskiners motorbelastning och avgasemissioner : samt metoder att minska bränsleförbrukning och avgasemissioner , 2002 .

[7]  Birger Danfors,et al.  Bränsleförbrukning och avverkning vid olika system för jordbearbetning och sådd , 1988 .

[8]  Bengt Johansson,et al.  Utveckling av relevanta arbetscykler och emissionsfaktorer samt reducering av bränsleförbrukning för arbetsmaskiner (EMMA) , 2002 .

[9]  Craig T. Bowman,et al.  Kinetics of pollutant formation and destruction in combustion , 1975 .

[10]  John J. Moskwa,et al.  The Development of Vehicular Powertrain System Modeling Methodologies: Philosphy and Implementation , 1997 .

[11]  Christian E. Lindhjem,et al.  A Method for Comparing Transient NOx Emissions With Weighted Steady State Test Results , 1998 .

[12]  M. Guillemin,et al.  Health effects of diesel emissions. , 1998, The Annals of occupational hygiene.

[13]  J. Raub,et al.  Health effects of exposure to ambient carbon monoxide , 1999 .

[14]  K. Siegmann,et al.  Physical and chemical properties of airborne nanoscale particles and how to measure the impact on human health , 1998 .

[15]  Evangelos G. Giakoumis,et al.  A computer program for simulating the steady-state and transient behaviour of direct-acting engine governors , 1999 .

[16]  J. Benajes,et al.  Predictive Modelling Study of the Transient Load Response in a Heavy-Duty Turbocharged Diesel Engine , 2000 .

[17]  R O McClellan,et al.  1985 Stokinger lecture. Health effects of diesel exhaust: a case study in risk assessment. , 1986, American Industrial Hygiene Association journal.

[18]  Gerhard Jahns.  A method of describing diesel engine performance maps : for presentation at ASAE North Central Region Conference ASAE , Weyburn Inn, Weyburn, Saskatchewan, October 14 - 15, 1983 , 1983 .

[19]  Timothy J. Callahan,et al.  Comparison of Predicted and Measured Diesel Exhaust Emission Levels During Transient Operation , 1987 .

[20]  Cleophas C. Jackson,et al.  Effects of Steady-State and Transient Operation on Exhaust Emissions from Nonroad and Highway Diesel Engines , 1998 .

[21]  J. Heywood,et al.  Experimental and Theoretical Study of Nitric Oxide Formation in Internal Combustion Engines , 1970 .

[22]  Timothy J. Callahan,et al.  The effects of discrete transients in speed and load on diesel engine exhaust emissions , 1985 .

[23]  Cynthia C. Webb,et al.  Nonroad Engine Activity Analysis and Transient Cycle Generation , 1999 .

[24]  Dimitrios T. Hountalas,et al.  Modeling the Structural Thermal Response of an Air-Cooled Diesel Engine under Transient Operation Including a Detailed Thermodynamic Description of Boundary Conditions , 1998 .

[25]  P A Valberg,et al.  Analysis of diesel-exhaust unit-risk estimates derived from animal bioassays. , 1996, Regulatory toxicology and pharmacology : RTP.

[26]  Jan Berdowski.  Overview of national programmes to reduce greenhouse gas emission , 1999 .

[27]  Ahmed Rachid,et al.  Measurement and prediction of diesel engine exhaust emissions , 1998 .

[28]  Per-Anders Hansson,et al.  Effects of Specific Operational Weighting Factors on Standardized Measurements of Tractor Engine Emissions , 1999 .

[29]  J L Mauderly,et al.  Relevance of particle-induced rat lung tumors for assessing lung carcinogenic hazard and human lung cancer risk. , 1997, Environmental health perspectives.

[30]  Per-Anders Hansson,et al.  Influence of derived operation-specific tractor emission data on results from an LCI on wheat production , 1999 .

[31]  M. Schrock,et al.  A Device for Aiding Gear Selection in Agricultural Tractors , 1986 .

[32]  K.Th. Renius,et al.  Trends in Tractor Design with Particular Reference to Europe , 1994 .

[33]  Stephen W. Searcy,et al.  Microcomputer-based tractor performance monitoring and optimization system , 1987 .

[34]  Mark Goedkoop,et al.  Life-Cycle Impact Assessment: Striving towards Best Practice , 2002 .

[35]  A A Sjoedin,et al.  NATIONELL EMISSIONSSTATISTIK FOER VAEGTRAFIKSEKTORN - OEKAD KVALITET, TROVAERDIGHET OCH KONSENSUS: FOERSTUDIE , 2003 .

[36]  Lidia Morawska,et al.  Combustion sources of particles. 1. Health relevance and source signatures. , 2002, Chemosphere.

[37]  Eva-Lotta Lindholm,et al.  Energy Use in Swedish Forestry and its Environmental Impact , 2006 .

[38]  P. C. D. F. Gomes,et al.  The Influence of Some Engine Operating Parameters on Particulate Emissions , 1992 .

[39]  Jun Kagawa,et al.  Health effects of diesel exhaust emissions--a mixture of air pollutants of worldwide concern. , 2002, Toxicology.

[40]  John B. Heywood,et al.  Internal combustion engine fundamentals , 1988 .

[41]  Per-Anders Hansson,et al.  Bestämning av motoremissioner från arbetsmaskiner inom jord- och skogsbruk , 1998 .

[42]  Christopher H. Onder,et al.  FUEL-OPTIMAL CONTROL OF CVT POWERTRAINS , 2001 .

[43]  Giorgio M. Cornetti,et al.  US Transient Cycle Versus ECE R.49 13-Mode Cycle , 1988 .