Work on the construction of a hybrid drive for a city bus has led to a solution in which hydropneumatic energy accumulators and a variable-speed transmission with a parallel power flow are used. In the controllable part of the variable-speed transmission there is a hydrostatic transmission operating in four quarters of the power field, owing to which it is possible to transfer energy to and from the vehicle wheels through the variable-speed transmission. A charge in the direction of an energy flow results in a change in the value of pressure in the operating conduits of the hydrostatic transmission from suction to force. The hydropneumatic accumulators were connected to the operating system by means of a system of logic valves controlling the flow and pressure, irrespective of the fact which operating conduit is a pressure conduit at a given moment.
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