Aiming at the shortage of methods confirming vehicle type with truck-load in the current analysis of highway freight vehicle operating cost (VOC), the research mode of VOC based on vehicle axle type classification is established.
5. For the real project, the method of life cycle cost analysis is adopted, by means of reasonable economic influence modeling, considering pavement initial construction cost, maintenance cost, vehicle operating cost and pavement residual value, economic analysis is made for pavement construction by one-stage and stages, and detailed economic comparisons between the two schemes are made separately by the methods of present value and annual value.
Given the shortage of methods to determine the vehicle type and truck load in the current analysis of highway freight vehicle operating cost, the model of VOC based on vehicle axle type classification is brought up. After the investigations of traffic and axle weight classified by axle types, truck axle load distribution model is established to estimate the truck load.
A system dynamics (SD) model with five sub-models, such as freight demand, vehicle usage, vehicle operating cost, vehicle evolvement and road performance, is established to simulate the above relationships quantificationally.
⑶ Thanks to the difference GPS and map matching technology , the remote statistics of the monitored vehicle operating condition is made and the relative error of range statistics is less than 0.5%. The capability is moderate and reliable.
Based on the multi-objective programming theory, according to the real operation conditions of a typical type of the commercial vehicle made in China, and under the several objectives such as the vehicle operating safety, the use reliability of engine oil, and the cost per kilogram of vehicle detecting test, diagnosis, maintenance and repair, this paper researches how to realize the optimization of the given vehicle's maintenance period, and gives out the exact value of the class Ⅱ maintenance period of the given type commercial vehicle.
And the preliminary results indicate that the design of the engine-generator control system can satisfy the power requirement of vehicle in all of vehicle operating conditions,and the control system has a good responsibility.
In this paper above all a test bed for gasoline engine to simulate vehicle operating conditions is presented in brief. The testing results with the emphasis upon the engine dynamic characteristics of simulative acceleration and deceleration on vehicle are introduced and the experimental results in detail are analysed.
In this paper, a fuel consumption prediction model is developed for 5 types of vehicle, based on fuel consumption experiments on road sections with various roughness levels, and a steady-state speed prediction model is also established by surveying the desired speed of vehicles, and by using probabilistic limiting speed approach. Thus, the fuel consumption-roughness relationship for 5 types of vehicle can be derived, for developing the vehicle operating cost model for pavement management system.
A method, laying a triangular wood under the untested wheel, for testing and measuring parking brake force is described in this paper. In this way, over a wide range of parking brake force could be measured, and by this method it is possible to measure the parking brake force to be in accordance with the relevant stipulations in vehicles operating on roads>, i.e.the total parking brake force should not be less than 20% of the gross vehicle weight.