Patent ID: 7395889
Filing Date: 2008-07-08
Classification: B60K,B60L,B60W,F16H,Y02T,Y10S

Abstract:
1. A hybrid drive unit for vehicles, in which an engine, a first motor generator, and a wheel are connected to a power distribution device constructed of a first planetary gear mechanism and a second planetary gear mechanism and having a plurality of rotary elements capable of rotating differentially with each other, and which is capable of steplessly controlling a speed change ratio as a speed ratio of the rotary element connected to the engine and the rotary element connected to the wheel by controlling the first motor generator or a second motor generator, wherein: the power distribution device comprises a first rotary element functions as an input element, a second rotary element capable of functioning as a reaction element, a third rotary element capable of functioning as an another reaction element, and a fourth rotary element functions as an output element; the engine is connected to the first rotary element, the first motor generator is connected to the second rotary element, the second motor generator is connected to the third rotary element, and the wheel is connected to the fourth rotary element; and comprising: a third motor generator connected to any of said wheel; an electric circuit for allowing exchange of electric power among individual motor generators; and an electronic control unit for carrying out a control to establish a reactive force against the engine torque by one of the first motor generator and the second motor generator the output of which is lower than that of the other one, and for carrying out a control to supply an electric power generated by the motor generator establishing the reactive force to the third motor generator in case the speed change ratio between the input element and the output element of the power distribution device is set larger than the larger speed change ratio out of the two speed change ratios which correspond to speed change ratios at inflection points where a transmission efficiency of the power transmitted from the engine to the wheel changes from increasing to decreasing.