A Study To The Optimal Matching Of Automobile Driveline

There are many technical indexes to appraise the performance of an automobile. Such as evaluating the index of an automobile dynamic performance which includes maximum vehicle speed, climbing grade ability and acceleration ability, the index of fuel consumption efficiency which includes the oil consumption per hundred kilometers when the automobile is under standard, testing cycle and so on. But it is insufficient to appraise the performance of an automobile by the indexes mentioned above comprehensively. The performance of an automobile includes dynamic performance and fuel consumption efficiency and the two parts can't be divided into two separate piece. Meanwhile the two indexes are mutually contradictory. Therefore each separate index only reflects one side of a automobile but not the whole.The development of the modern automobile technology has caused the dynamic performance and the fuel consumption efficiency to achieve the unprecedented high level, but between the two has a reasonable match problem. If we want to get high dynamic performance of an automobile, we should enable the automobile to have a high vehicle speed and a strong force of traction. While we want to get better fuel consumption efficiency , we should not only make the engine's fuel consumption at the lowest rate, but also make the engine work in the economic region of the lowest fuel consumption rate when the automobile is in its actual driving condition. Regarding a certain specific automobile, the gross weight, the weight assignment, the tire and so on have been determined .In the situation ,if we want to achieve this point, we mainly depend upon the reasonable match between engine and the power transmission. That is to say we should choose various parameters of the engine and the transmission system to cause it display its best dynamic performance and the fuel consumption efficiency.This article introduces many research results and in the correlation laws and regulations system foundation in the full elaboration domestic overseas automobile dynamic system, proposes a set of appraisals automobiles power match method, carries on the quantification appraisal to the vehicles dynamic system match. And ten thousand has the characteristic mathematical model establishment from the motor car engine mathematical model to obtain, the utilization value method and the partial optimized theory, simulate automobile dynamic performance and the fuel consumption efficient equation, takes the establishment appraisal target the basic basis. Uses the multi- factors weighting method of correlates, has establishedthe automobile power match appraisal system. High keeps off the maximum speed factor the good road surface to take the automobile dynamic performance appraisal target, high keeps off the commonly used vehicle speed compared to the oil consumption factor to take the automobile fuel oil efficient appraisal target, the automobile energy use factor by a overall target took the third appraisal target, carries on these three targets weighting processing, obtains a quality synthetic evaluation equation, by this measure automobile dynamic system concrete match fit and unfit quality. This method has carried on the abstract summary to each kind of performance index and the formula of the automobile, forms a set of simple direct-viewing assessment methods, has avoided the massive numerous and diverse computations, namely has balanced in each kind of target contradiction, also has highlighted the automobile integrity and thus has more manipulative feasibility.