METHOD TO CONTROL SPEED OF TRACTION VEHICLES INTERNAL COMBUSTION ENGINEERING Russian patent published in 2006 - IPC G01M15/00 F02D29/02 

FIELD: mechanical engineering; internal combustion engines.

SUBSTANCE: according to proposed method, radius r_k of vehicle propulsor, namely, drive wheel or drive sprocket, and vehicle gross weight G, are measured, and using load brake, engine torque M_e id changed. Engine torque M_e and engine speed n set by means of governor are measured for each value of torque M_e, and fuel consumption for each value of engine torque M_e is measured and, basing on results of measurements, curve is plotted showing dependence of power N_e from engine torque M_e. Drawbar force P_dr of traction vehicle is found from expression P_dr= M_e(η_tr·i/r_k)-P_fmax, where η_tr is transmission efficiency; I is transmission gear ratio; P_fmax is traction vehicle maximum rolling resistance found from expression P_fmax=f_max·G, where f_max is maximum rolling resistance coefficient, and G is gross weight of traction vehicle. Skid coefficient δ 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 P_dr from engine torque M_e for different gears of vehicle and dependence of skid coefficient δ from drawbar force P_dr of traction vehicle after which maximum drawbar force P_drmax 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 δ from vehicle drawbar force P_dr, for each gear of vehicle signals are formed and sent to computer to determine corresponding value of torque M_e1 maximum drawbar force P_drmax dependence of drawbar force P_dr from torque M_e, then signal is formed and sent to computer to determine power N_e1 for maximum drawbar force P_drmax by value of torque M_e1 from curve showing dependence of engine power N_e from engine torque M_e, value of power N_e1, thus found, is compared with value of power N_e 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