General principles of expanding the speed range of operation of autonomous power supply systems for passenger cars
Authors address the issues of expanding the speed range for operation of autonomous power supply systems for air-conditioned passenger cars. For the first time in the domestic car construction, the issue of reducing the minimum start-up speed of a generator-drive unit arose when the passenger fleet of the Sakhalin Railway was renewed, where the speed of passenger cars is much lower than the overall network speed. Research carried out by CJSC SO “TIV” and JSC “TVZ” has shown that the use of V-belts in the modernization of the textropic-reduction-cardan drive allows solving this problem. Kinematic diagram of the drive was adopted without changes, but with the replacement of the V-belts C (B)-2360T with new narrow belts XPC-2360 without working surface wrap and with a formed tooth on the lower base. In the tensioner, the main spring with a stiffness of 75 N/mm was replaced with a spring of increased stiffness (100 N/mm). The main change was the replacement of the 2GV003 generator with a 2GV008 low-speed generator, which has a minimum rotation at full power (700 rpm). This modernization of the drive made it possible to turn on the generator 2GV008 at rated power, starting at a speed of 30 km/h. The article sets the task of expanding the speed range of operation of the EV-7 and EV-10 autonomous power supply systems for cars without air conditioning. It is solved by forcing the excitation of the generators. Analysis of modern systems of autonomous power supply of passenger cars showed that the expansion of the speed range of its operation can be achieved in three ways: • raising the gear ratio of the gearbox to ensure it is switched on to the nominal mode at a carriage speed of 15 - 20 km/h without changing the parameters of the generator and the entire system of autonomous power supply; • modernization of the electrical equipment complex for passenger cars to ensure the operation of the main power consumers and charge the battery while driving at low speeds (over 18 km/h) without changing the mechanical parameters and composition of the serial generator-drive unit; • modernization of the generator in order to reduce its turn-on revolutions to the power required to provide the main power consumers without changing the mechanical parameters of the drive. All three methods have its advantages and disadvantages, the choice of any of them is determined by the technical requirements for a specific car model.