| 摘要 |
FIELD: mechanical engineering; internal combustion engines. ^ SUBSTANCE: according to proposed method, radius rk of vehicle propulsor, namely, drive wheel or drive sprocket, and vehicle gross weight G, are measured, and using load brake, engine torque Me id changed. Engine torque Me and engine speed n set by means of governor are measured for each value of torque Me, and fuel consumption for each value of engine torque Me is measured and, basing on results of measurements, curve is plotted showing dependence of power Ne from engine torque Me. Drawbar force Pdr of traction vehicle is found from expression Pdr= Me(etatr.i/rk)-Pfmax, where etatr is transmission efficiency; I is transmission gear ratio; Pfmax is traction vehicle maximum rolling resistance found from expression Pfmax=fmax.G, where fmax is maximum rolling resistance coefficient, and G is gross weight of traction vehicle. Skid coefficient delta of traction vehicle is found and result are transformed into electric signals which are sent to computer to plot curves showing dependence of drawbar force Pdr from engine torque Me for different gears of vehicle and dependence of skid coefficient delta from drawbar force Pdr of traction vehicle after which maximum drawbar force Pdrmax created by propulsors of traction vehicle with gross weight is determined and signals are formed and sent to computer to determine skid coefficient from dependence of skid coefficient delta from vehicle drawbar force Pdr, for each gear of vehicle signals are formed and sent to computer to determine corresponding value of torque Me1 maximum drawbar force Pdrmax dependence of drawbar force Pdr from torque Me, then signal is formed and sent to computer to determine power Ne1 for maximum drawbar force Pdrmax by value of torque Me1 from curve showing dependence of engine power Ne from engine torque Me, value of power Ne1, thus found, is compared with value of power Ne from engine specifications and if they do not coincide, engine speed n and transmission gear ratio I are adjusted. ^ EFFECT: improved efficiency of use of vehicle engine owing to increased accuracy of measurement of engine power with account of specific operating conditions of vehicle, reduced labor input at measurements and processing of results of measurements. ^ 2 cl, 1 dwg |
