The Study Of Load Characteristics Curve Of Engine

As the heart of vehicles, the motors' performance affects the vehicls' dynamical,economical performance,exhaust pollution etc, directly. Researching and improving the vehicles' performance has very great significance on the improving the vehicles' various performance. The movements of the motors are decided by the speed,power and wresting moment of the cranks. These motors have the different purpose are used in different working situation. We have to research the characteristic of the motors in order to estimate the dynamical,economical performance targets and perfect degree of the working procedure of the vehicles in different working situation, namely to research the relation between the dynamical,economical performance targets with the diversification of working situation and express this relation with curve form. This is the motors characteristic curve. The purpose of researching engins' characteristic curve is find the changing regularity of the engins' dynamical,economical performance targets and the speed which is corresponded to the max power,maximum wresting moment and minimum consuming rate of fuel when they are working in different speed, and then we can confirm the favorable working speed range of the motors. There are several familiar engins' characteristic curve such as load characteristic curve,all-purpose characteristic curve,speed characteristic curve,external characteristic curve,speed-adjusting characteristic curve, etc.The motors' load characteristic curve is one of the main characteristic curves. The purpose of researching engins' load characteristic curve is to find the changing regularity of the engins' dynamical,economical performance targets at the situation of the motors' constant speed, this is relation curve between the fuel consuming qualities per hour,fuel consuming rate of the motors and the changing of the motors' loads(the accelerograph size of petrolic motors and the position of the rack of diesel motors).The X-coordinate of the road characteristic curve is power or average effective press, then the Y-coordinate is its performance targets, and mainly discussing the mutative relation between the fuel consuming rate and the loads. We can estimate the engines' economical performance by load characteristic curve when working on different loads, as well as draw the speed characteristic curve and the all-purpose characteristic curve according to load characteristic on various speed. Additionally, the load characteristic is available easily. So during the procedure of adjusting the motors, we often use the load characteristic as the criterion to compare the performance targets.These new designed and produced motors and great mended motors all needs console stands test to measure and validate their load characteristic whether achieving the require of former design, then we must supply necessary gists on improving work.This article analyses development trend and current status about the domestic and overseas research on motors' load characteristic curve and present the buildup and working principle of the whole system on research and test of motors' characteristic. With the help of theoretical analysis of the motors' characteristic and the motors' test console stand(it is usually composed of these parts:1)power measurement machine2)console and electric controlling system3)parameter measurement system4)data processing system5)the controlling instruments directed by testing program. Furthermore, in order to meet the require of the testing work, the cooling wind system for the wind cooling motors ,deflating system for exhaust emission and motors' throttle controller and other assistant devices are also needed to collocate), We can collect motors' load characteristic testing data----motors' output speed,wresting moment,power,fuel consuming qualities per hour,fuel consuming rate of the motors etc, and process the data, establish math model, inserting value and recursive modulus computer the testing data, develop drawing software of cubic spli...