Change of circuit current configuration during driving of a vehicle

Abstract

In the cases considered, a frequency shift of the maximum moment is observed both in the region of low and in the region of high revolutions, and the direction of displacement cannot be unambiguously tied to the type of engine or the manufacturer, although it is worth noting that for all the mentioned Volkswagen engines, the maxima are shifted to the right.

In most cases, the maximum torque during acceleration is reduced. On tested vehicles, the reduction does not go beyond 8%. This should be used when solving practical problems, for example, calculating the acceleration time of cars. In the low-frequency zone of some engines, the moment falls by 3–6 times in comparison with the nominal value obtained in steady-state modes. Presumably, the degree of this fall depends on the technical condition of the engine, for example, the deterioration of the cylinder-piston group.

The results obtained do not give reason to develop practical recommendations, but they clearly indicate the need for further study of the issue. More extensive and thorough research is needed, in particular, taking into account the age of the engine, in order to exclude the influence of the technical condition.

Experimental studies are presented in the form of experimental dependencies that reflect the torque curves of passenger car engines taken at steady loads during acceleration, depending on the speed range and the acceleration rate.

During acceleration in road conditions, the maximum value of the torque is obtained at a lower angular speed of rotation of 100–200 min ^{– 1}.

A technique has been developed for restoring the torque curve from the parameters of acceleration and coasting of the car, assuming that the static resistance during acceleration and coasting is the same, and the dynamic radius is equal to the radius of the rolling element.