Travel control device of hybrid vehicle

摘要

A travel control device is applied to a hybrid vehicle which includes a planetary gear mechanism capable of distributing power of an internal combustion engine to a first MG and an output part, and a second MG capable of outputting power to the output part. The travel control device allows the vehicle to travel in an acceleration-deceleration travel mode in which, when a high-speed steady travel condition is established during travel of the vehicle, acceleration travel for accelerating the vehicle with power output from the internal combustion engine and coasting travel for allowing the vehicle to coast with the internal combustion engine in a stop state are alternately repeated within a target vehicle speed range. In the travel control device, given power is output from the internal combustion engine at the time of acceleration travel, and the internal combustion engine is controlled such that the vehicle is accelerated at an acceleration such that the rotation speed of the first MG becomes zero.

主权项

1. A travel control device for a hybrid vehicle, the hybrid vehicle including
an internal combustion engine, a first motor generator, an output part configured to transmit power to a driving wheel, a differential mechanism including a first rotary element, a second rotary element, and a third rotary element, the first rotary element, the second rotary element, and the third rotary element being configured to mutually perform differential rotation, the first rotary element being connected to the internal combustion engine, the second rotary element being connected to the first motor generator, and the third rotary element being connected to the output part, and a second motor generator configured to output power to the output part, the travel control device comprising: an electronic control unit configured to i) when a predetermined acceleration-deceleration travel condition is established during travel of the vehicle, a) set a target vehicle speed range based on a requested speed requested for the vehicle, and b) control the internal combustion engine, the first motor generator, and the second motor generator such that the vehicle travels in an acceleration-deceleration travel mode, the acceleration-deceleration travel mode being a travel mode in which acceleration travel and coasting travel are alternately and repeatedly performed within the target vehicle speed range, the acceleration travel being a travel in which the vehicle is accelerated with power from the internal combustion engine by putting the internal combustion engine in an operation state, and the coasting travel being a travel in which the vehicle coasts by putting the internal combustion engine in a stop state, and ii) control an operation of the internal combustion engine such that at a time of the acceleration travel, the vehicle is accelerated at an acceleration at which given power is output from the internal combustion engine and a rotation speed of either the first motor generator or the second motor generator becomes zero.