Experimental Study of Moving Truck Emissions on Inter-City National Road : A Case Study of Malino Main Road

The research aimed to determine exhaust emission and speed of the truck when moving. Measurements were made using a mobile emission analyzer that absorbed emission from truck exhaust. Data collection was done by putting mobile emission analyzer on the right side of the vehicle which absorbs 5 emissions of approximately 5 minutes.The relationship of exhaust emission and speed uses the polynomial model of the average value of exhaust emission and speed. The reliability of mobile emission analyzer uses the multiplier factor to solve the data difference between mobile emission analyzer and Bosowa equipment. The results of research indicate emission of CO 2 , NOx, Smoke, CO, andHC forming driving cycle pattern.This pattern shows the pattern follows parabola tendency. Emission on damaged road is higher than good road although the emission values are not much different. However, the value of emission of Smoke is relatively equal in both road conditions.


Introduction
The transport sector is one major cause of current environmental problems.Increased carbon dioxide, noise, air pollution, and physical and environmental disturbances are the negative impacts of transport.Globally, motor vehicles emit 14% of carbon dioxide-based fossil fuels, 50%-60% of carbon monoxide and hydrocarbons, and about 30% of nitrous oxide emissions [1].The main causes of air pollution are due to motor vehicle exhaust due to poorly used fuel oil quality, traffic congestion, and traffic behavior on the road [2][3][4][5].Emission is a problem that causes air pollution everywhere in both the surrounding environment on the road and the global environment that can affect the hotter air.It is one of the most basic problems.Each motor vehicle will exhaust emission that is large depending on the year of the vehicle and the type of fuel used.Vehicles for longer manufacturing years will exhaust more emissions than new; vehicles with gasoline will exhaust different types of emissions with diesel-fueled vehicles [6].Emissions of vehicles containing heavy metals (lead, PB, etc.) if inhaled can interfere with human health.
Models of vehicle emissions prediction developed with the development of emission models as multiplying vehicle kilometer travel (VKT) and emission factor (EF). VKT is the multiplication of vehicle distance traveled (D) and traffic volume (N); EF is the basic emission factor of each vehicle category.Variables that significantly affect vehicle emissions in urban areas with heterogeneous traffic situations are no longer the distance of vehicle travel (D) [7,8].Influential variables are travel time (TT) and actual vehicle driving cycle pattern [9].The determination of driving cycle pattern on the highway has never been done in Indonesia.[4,5] also conducted a study related to their respective driving cycle measurements in Bangkok, Thailand, and in Hanoi, Vietnam.Automotive emissions analysis is highly dependent on vehicle speed and acceleration.Speed and acceleration of the vehicle are a characteristic of the vehicle driving pattern [4,5].The driving pattern of the vehicle in question is characteristic of the driving pattern on an urban highway determined on the basis of appropriate road trails and current traffic conditions.To date, no method has been found to choose the right route to analyze the actual driving pattern [4].According to [10], the variable driving cycle patterns are idle situation, acceleration, deceleration, oncoming vehicle, and average speed of the vehicle.The largest composition of truck emissions on A.P. Pettarani road is CO 2 , but the percentage of vehicle type is small enough, 0.63% to 27.29%, where its frequency distribution rate of the day is not similar for all arterial roads in Makassar city [11].A study conducted on gas emissions generally found that the tendency that arises is the faster the vehicle speed, the greater the CO 2 , NOx, Smoke, CO, and HC released or this will increase with increasing vehicle speed.Thus, the relationship of emission with vehicle speed is a linear relationship [12].Examined vehicle exhaust gas emissions, CO, NO, NOx, and CO 2 , are measured at variations in the speed of moving vehicles 0, 20, 40, and 60 km/h.The relationship of emission and vehicle speed uses a polynomial model.The result of emission measurement of the IVEM Model showed a low value of CO 2 , as well as other types of emissions [13].The emission measurement results of the IVEM Model show a low CO 2 value, as well as other types of emissions.Speed will also affect the amount of emissions issued by a vehicle.According to [6] emissions test in the United States, the higher speed used in a vehicle, the smaller amount of HC and CO emitted.This is inversely proportional to NO 2 , where the higher speed of motor vehicles use, the larger NO 2 emitted.The measurements of running vehicle emissions starting by recording a pre-moving vehicle (zero speed) are described, but vehicle engine has been turned on [14].
The emission measurement equipment mounted on the diesel power plant valve is examined.The compounds consist of carbon monoxide (CO), sulfur dioxide (SO 2 ), and nitrogen oxide (NOx).The information about emission can be accessed using an online information system [15].Percentage of trucks passing Malino Main Road is the Single Engkel 2.68%, Double Engkel 84%, Trintin 0%, Tronton 12.64%, and Trintin 0.26% [16].The Bina Marga method has the final result in the analysis as the priority sequence and maintenance of road damage, while the PCI (Pavement Condition Index) method has the final result, namely, the pavement quality classification on the road segment.The form of maintenance that can be done is by giving an additional layer and compacting, the gap is filled with a mixture of asphalt and sand, and the pavement is dismantled and then overlaid with the same material [17].
Looking at the strategic issues and previous studies on vehicle emissions, then this research focused on developing mobile emission recording to assess emissions of trucks into good road and damaged road using driving cycle approach on Inter-City National Roads.

Materials and Methods
Method of research used is experimental method with quantitative approach.Research was conducted on Inter-City National Road of Malino Main, the segment of Gowa Malino Main Km. 6-8 road type 2/1 (1 lane 2 ways).Based on [16], the type of vehicle used for the sampling activity was determined where the volume of Double Engkel is the type of vehicle that dominates the trucks that pass Malino Main Road.Then in this research, the type of sample vehicle used is Double Engkel.
The survey was conducted by developing an Arduino Mega-based recording device, a device capable of recording the types of emissions such as CO 2 , NOx, Smoke, CO, and HC.The presence of flue gas detected by the sensor will make a difference in the resistance of the sensor so that it will affect the amount of output voltage from the sensor.The output from the sensor will be forwarded to the Arduino circuit, converted into digital data so that it can be read on the LCD, and the data is stored to the MicroSD.The work system diagram of moving truck emission measurement can be seen in Figure 1.
Emission recording of running truck was done by using mobile emission analyzer equipment made by Hasanuddin University.Vehicles operate on varying speeds starting from the beginning of the move at the first point until it stops at the second point.The vehicle exhaust gas is captured by a hose connected directly to the mobile emission analyzer.The activity of emission sampling is done by capturing the exhaust gases from the exhaust using an iron pipe.This gas pipeline is made in the right-angle shape and at one end is connected to a plastic hose to move flexibly.This hose is then connected to a tube containing CO 2 , NOx, Smoke, CO, and HC sensors.The end of the pipe that enters the exhaust is tied wires and rope so that the gas pipeline does not fall.Mobile emission analyzer is placed in the center of the vehicle beside the exhaust along with the battery.
Mobile emission analyzer is turned on and after heating for 2 minutes, the sample of vehicle is run with varying speed starting from the beginning of move until it stops.Determination of measurement duration is 5 minutes.Gas that comes from the exhaust is then flowed into a tube containing CO 2 , NOx, Smoke, CO, and HC sensors.Then the exhaust gas is read on the LCD screen of mobile emission analyzer.The data of gas compounds read by sensors is stored in MicroSD memory.The data can be copied to PC (Laptop, Notebook, Computer) using card reader, to then proceed with data processing.Exhaust emissions data and speed of truck observed on running vehicle are expressed in driving cycle patterns.Stages of emission measurements are shown in Figure 2.  Based on Figure 3 obtained the data difference from mobile emission analyzer and equif tachometer Bosowa where the average CO 2 of Bosowa equipment is 15.00% and the self-equipment is 22.53%, then to solve the data difference of Bosowa and self-equipment needed correction factor 0.666; average CO of Bosowa equipment is 0.007% and self-equipment is 0.028%, then to solve the data differs from the self-equipment and Bosowa needed correction factor 0.243; average value of NOx of Bosowa is 46.5 ppm and self-equipment is 37,6 ppm, then to solve the data difference from the self-equipment and Bosowa needed correction factor 1.236; and the average HC of Bosowa equipment is 9.76% and the self-equipment is 12.773%, then to solve the data difference from the self-equipment and Bosowa needed a multiplier factor 0.764.

. . Spectrum of Mobile Emission Recording on Truck.
Assessment surfaces road damaged condition was identified visually using Bina Marga method (1990) and PCI method (1994).Exhaust emission patterns of CO 2 , CO, Smoke, NOx, and HC on running truck condition in good and damaged road are shown Figure 4, with the truck running in Poros Malino street on good road condition until 85 seconds and speed 0 km/h to 49,1 km/h, emission of CO 2 4%-16%, CO 0%-3%, Smoke 0%-13%, NOx 0%-12%, HC 0%-11%, and with the truck running on damaged road conditions until 197 seconds and speed 0 km/h to 35,8 km/h, emission of CO 2 3%-18%, CO 0%-5%, Smoke 0%-13%, NOx 0%-15%, and HC 5%-14%.From the above data can be seen the relationship between exhaust emissions and speed in damaged road conditions with higher CO 2 , CO, NOx, and HC values than good road conditions although the  emission value is not much different.However, value of emission Smoke is relatively equal in both road conditions.

Conclusions
The road condition was identified as good or damaged by using the criteria of Bina Marga and PCI.The reliability of mobile emission analyzer uses the multiplier factor to solve the data difference between mobile emission analyzer and Bosowa equipment.The result of emission analysis truck with driving cycle pattern shows the pattern follows parabolic tendency.Emission values of CO 2 , CO, NOx, and HC in damaged road are higher than good road even though the emission values are not much different.However, value of emission of Smoke is relatively the same in both road conditions.

Figure 1 :
Figure 1: Work system diagram of mobile emission recording.

Figure 5 :
Figure 5: Exhaust emission driving cycle pattern on good road conditions.

Figure 6 :
Figure 6: Exhaust emission driving cycle pattern of truck on damaged road conditions.
Tecnomotor on dieselfueled Colt Diesel vehicles with injection combustion system and Mirage model of gasoline-fueled Bosowa brand, 1200 CC, manufacturing year 2012, traveled distance 1218 km in PT.Bosowa Berlian International Motor and test results in emission correction factor.Comparison of emission tests is shown in Figure 3.
Driving Cycle Pattern of Truck . . .Exhaust Emission Driving Cycle Pattern of Trucks on Good Road Conditions.Exhaust emission driving cycle pattern of truck on running condition into good road is shown Figure 5. Driving cycle pattern depicts parabolic curve, where emission values to show go up maximal at a certain speed of CO 2 23,22 Km/h, CO 33,12 Km/h, Smoke 33,12 Km/h, NOx 31,98 Km/h, and HC 36,82 Km/h.Looking at Figures 5 and 6 trucks loaded on good and damaged roads show that the magnitude of CO 2 , CO, and Smoke emissions is not significantly different, ≈ 1%, NOx and HC emission of good and damaged roads.It appears that the emission difference is ≈ 4 ppm.