ANALYSIS OF PASSENGER VEHICLE CRUISION BY THE MODIFIED METHOD OF CLOSED SPEEDS

Abstract

Monitoring and diagnosing the technical condition of vehicles is one of the most crucial issues. Recent studies conducted at Kharkiv National Automobile and Highway University (KhNADU) confirm that the condition of transmission aggregates and the chassis of a vehicle can be characterized by the distance traveled during coasting. Several factors influence coasting distance, including operational and design features, as well as the aerodynamic properties of the vehicle and the condition of its transmission and chassis components. The constant improvement of automobiles necessitates a reevaluation of methods for assessing motion resistance, making the modified method for determining approximate speeds relevant. Research has shown that for testing passenger cars, a horizontal road section of over 750 meters is needed for coasting from a speed of 50 km/h to a stop, which is not always available. However, coasting tests can be conducted at different speeds on shorter sections. Changes have also been made to the well-known coasting analysis method, and empirical formulas for air and rolling resistance have been developed, allowing for more accurate calculation of coasting distance and time than the classical method. The results of experiments have improved the method for estimating total resistance when a vehicle is in motion during coasting, dividing it into road and aerodynamic components. Additionally, advancements in vehicle technology underscore the importance of developing comprehensive diagnostic tools and procedures to ensure optimal performance and safety. This includes integrating advanced sensors and diagnostic systems into vehicles to provide real-time feedback on their condition, enabling proactive maintenance and minimizing the risk of unexpected failures.

Keywords: сar breakaway, car test, acceleration time, coasting time, tire, car.