Impact of Vehicle Load on Heavy-Duty Vehicle Carbon Emissions
The existing issues that current transportation carbon emission models do not adequately consider the load variation characteristics of heavy-duty vehicles under real-world road conditions,and have not yet analyzed the impact of vehicle load on emissions from the perspective of microscopic emission rates,lead to the biggish uncertainty of carbon emission estimation.To address this issue,firstly,extensive data on the operational conditions and fuel consumption of heavy-duty trucks under real-world conditions were collected.A fuel consumption-based CO2 emission calculation model was used to calculate the CO2 emissions of heavy-duty trucks.Then,different categories of trucks were classified and discussed.An emission model based on VSP(Vehicle Specific Power)was used to study the impact of vehicle load on CO2 emissions,and a LC-VSP(Load-Considered VSP)emission model considering vehicle weight was established.A comparison was made between the LC-VSP model and the traditional mobile source emissions model MOVES(Motor Vehicle Emission Simulator Model)in terms of emission calculation errors.The results of the research indicate that load capacity has a significant impact on CO2 emission rates and VSP distribution of heavy-duty trucks,thus significantly affects the CO2 emission factors,as follows:①When VSP is in a small positive range,CO2 emission rates linearly increase with the increase of load;②In the same speed range,with the increase of load,the mean and variance of VSP distribution gradually decrease;③Under average operating conditions,the CO2 emission factors for fully loaded vehicles increase by approximately 24%to 113%compared to empty vehicles,depending on the vehicle type.When the vehicle speed is low(less than 20 km/h),the load has a significant impact on CO2 emission factors.The CO2 emission factor of fully loaded vehicles(49 t)is 2.8 times that of empty vehicles(18 t).However,as the speed increases,the impact of load on CO2 emission factors gradually diminishes;④Compared to emission models that do not consider the actual vehicle load,considering actual vehicle load can reduce CO2 estimation errors by 3%to 12%.It emphasizes the necessity of considering vehicle load in emission estimations,providing a certain theoretical basis for accurate emission modeling and assessment.
国家科技期刊平台
NSTL
万方数据
维普
