METHOD OF CONTROL SPEED OF VEHICLE INTERNAL COMBUSTION ENGINE Russian patent published in 2006 - IPC G01M15/00 F02D29/02 

FIELD: mechanical engineering; internal combustion engines.

SUBSTANCE: invention relates to testing and regulating of internal combustion engines. According to proposed method, radius r_k of vehicle propulsor is measuring and as well as vehicle gross weight G, and using load brake, engine torque M_e is changed. Engine torque M_e and engine speed n are measured. Fuel consumption for each value of engine torque M_e is measured and basing on results of measurement curve is plotted showing dependence of engine power N_e from engine torque M_e, tangential traction force P_t of vehicle propulsor on radius r_k is found from expression P_t= M_e·η_tr·i/r_k, where η_tr is transmission efficiency; I is transmission gear ratio, speed V of vehicle engine is found from expression V=3,377·r_k·n/i, maximum tangential traction force P_{t max}, created by propulsors of vehicle with gross weight G is found from expression P_{t max}=ϕ_max·G, where ϕ_max is maximum adhesion coefficient of propulsors with ground. Results are transformed into electric signals, signals are sent to computer and, basing on the signals curves are plotted showing dependence of traction force P_t from engine torque M_e and dependences of vehicle speeds V for different gears of vehicle from value of tangential traction force P_t and after determining maximum tangential traction force P_{t max} for each gear of vehicle, signals are formed and sent to computer to determine corresponding speed V_{max 1} for maximum tangential traction force P_{t max} from relationship of vehicle speed V and value of tangential traction force P_t and corresponding value of torque M_e1 for maximum tangential traction force P_{t max} from dependence of tangential traction force P_t from torque M_e after which signals are formed and sent to computer to determine power N_e for maximum tangential traction force P_{t max} by value of torque M_e1 from curve showing dependence of engine power N_e from engine torque M_e. If value of maximum tangential traction force P_{t max} exceeds value of tangential traction force P_t1 for first gear, signals are formed and sent to computer to determine power N_e1 and torque M_en1 from expressions N_e1=P_{t max}·V₁/270·η_tr1 and M_en1 P_{t max}·r_k/ η_tr1·i₁, where V₁ is speed of vehicle in first gear, i₁ is transmission gear ratio in first gear; η_tr1 is transmission efficiency in first gear, r_k is vehicle propulsor radius. Power values found by calculations and from curve, are compared, and if they do not coincide, speed n of engine and transmission gear ratio I are adjusted.

EFFECT: improved efficiency of use of vehicle internal combustion 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.

1 dwg