HYBRID VEHICLE AND METHOD OF CONTROLLING HYBRID VEHICLE

摘要

An ECU performs control processing including setting an inverter to a gate blocking state when an abnormal condition of the inverter occurs, activating a converter, driving an engine, carrying out first suppression control when an abnormal condition of a resolver occurs and when an MG2 rotation speed immediately before occurrence of the abnormal condition is equal to or smaller than a first speed threshold value, and carrying out second suppression control when the MG2 rotation speed immediately before occurrence of the abnormal condition is greater than the first speed threshold value and when there is no record of stop.

主权项

1. A hybrid vehicle comprising:
an engine; a first rotating electric machine including a permanent magnet in a rotor; an output shaft connected to a wheel; a planetary gear mechanism including a carrier coupled to the engine, a sun gear coupled to the first rotating electric machine, and a ring gear coupled to the output shaft; a second rotating electric machine connected to the output shaft; a battery; an inverter configured to convert power among the battery, the first rotating electric machine, and the second rotating electric machine; a first sensor configured to detect a rotation speed and a direction of rotation of the first rotating electric machine; a second sensor configured to detect a rotation speed and a direction of rotation of the second rotating electric machine; an engine rotation speed sensor configured to detect a rotation speed of the engine; a wheel speed sensor configured to detect a rotation speed of the wheel, the wheel speed sensor being unable to detect a direction of rotation of the wheel; and a controller configured to carry out inverterless running control when the first rotating electric machine and the second rotating electric machine cannot normally be driven by the inverter, the inverterless running control being control in which the inverter is set to a gate blocking state, the engine is driven to generate in the first rotating electric machine, braking torque originating from a counter-electromotive voltage, and a vehicle runs with torque applied to the output shaft as reaction force of the braking torque, and when the controller cannot obtain output values from the first sensor and the second sensor during the inverterless running control, the controller being configured to:
calculate (i) a first estimated value of a rotation speed of the first rotating electric machine when the wheel is assumed to rotate forward and (ii) a second estimated value of a rotation speed of the first rotating electric machine when the wheel is assumed to rotate rearward, by using an output value from the engine rotation speed sensor and an output value from the wheel speed sensor; andcontrol the rotation speed of the engine such that both of the first estimated value and the second estimated value are within a predetermined rotation speed region.