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162 Florin Popa et al. Fig. 2 highlights characteristic of the propulsion system model is chosen, it is the actual power and timing variations in the actual engine propulsion system obtained by simulation, in the form of an executable. Fig. 1 – Basic parameters related coefficients picture. Fig. 2 – Characteristic of the propulsion system.
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 163 2. Simulations From these raw elements, further presented the most significant results of simulation MATCEL-PROP, looks especially the problem of propulsion system stability. Were considered, in particular, common situation of equipment for the real propulsion system model of car chosen, designed to lead to some conclusions with applicative features, useful in terms of its mechanical and functional optimization (Heywood, 1988). Results are summarized using the variation diagrams of engine torque, Mm, resistant torque reduced to motor shaft, Mrr and specific fuel consumption, ce, depending on the angular velocity ω of motor shaft, presented in figures below (Heisler, 2002),. For each case, algorithm simulation allows determining the position of the system operating point corresponding to maximum speed of the car. On the other hand, in order to emphasize the stability of propulsion, these diagrams contain the tangent lines to variation curves of torques in the operating point, Fct.tan.Mm, respectively, Fct.tan.Mrr. In this respect, a first case simulated and analyzed (ES1) with MATCEL- PROP considers basic equipment of the propulsion system, which includes an engine having the effective power value 64 kW, assimilated in the model with an engine power (Pe=Pm), and a 15" wheel diameter. By assigning the value 4 for main gear ratio, i0, variations in Fig. 3 shows a stable operating point at maximum speed of 149 km/h, and further characterized by an acceptable specific effective fuel consumption, respectively 173 g/kWh. M (Nm) 140 120 100 80 60 40 20 stable operation i0=4 Pe=64 [kW], d=15" 1200 2200 3200 4200 5200 6200 n (rpm) 160 230 220 210 200 190 180 170 160 0 150 126 230 335 440 545 649 ω (rad/s) ce (g/kWh) Mm Mr reduced Fct.tan.Mm Fct.tan.Mrr Fig. 3 – Conditions for stable operation of the propulsion system - highlighted by the simulation phase ES1. Still increasing main gear ratio by only 0.5, thus leading to the value i0=4.5, the propulsion system behavior becomes unstable, speed decreases slightly the value of 148 km/h, there the premises so that it can not be kept constant, while the value of specific effective fuel consumption rises to 173 g/kWh to 186.4 g/kWh, situation highlighted by the diagrams in Fig. 4. On the other hand, from baseline, summarized in Fig. 3, reducing by 0.5 the ratio main gear i0, it reaches i0=3.5, achieve a very stable operating point, leading to maximum speed 146.9 km/h, very stable value, made with a specific ce
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