Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Electric vehicle
Reexamination Certificate
2001-04-17
2003-09-23
Nguyen, Thu (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Electric vehicle
Reexamination Certificate
active
06625524
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
The invention relates to a control apparatus and a control method for a hybrid vehicle.
2. Description of Related Art
A split, hybrid vehicle has been conventionally provided in which an engine, two electric motors, and a planetary gear unit, as a differential gear device, are provided. Three gear elements of the planetary gear unit are connected to the engine, one of the electric motors and an output shaft, respectively, and the other electric motor and the output shaft are connected (see Japanese Patent Application Laid-Open No. HEI 10-98805).
For example, when an accelerator pedal is depressed so that the rotation of one gear element of the various gear elements of the planetary gear unit changes, the rotation speed of one of the electric motors changes. Therefore, a design is provided such that a target motor torque of the other electric motor is set, taking the inertial torque of the one of the electric motors into consideration. Hence, the drive feeling of the hybrid type vehicle can be improved.
However, in the aforementioned conventional hybrid type vehicle, more specifically, in the case of a split, hybrid vehicle in which the planetary gear unit has four gear elements, and the gear elements are connected to the engine, the two electric motors, and the output shaft, respectively, the drive feeling of the hybrid type vehicle deteriorates, for example, in a situation where, when the accelerator pedal is depressed so that one of the gear elements of the planetary gear unit, for example, the gear element connected to the engine, changes in rotation speed, the two motors, which change in rotation speed with changes in the rotation speed of the gear element, are not properly controlled.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the invention to provide a control apparatus and a control method for a hybrid type vehicle, more specifically, a split, hybrid vehicle in which a differential gear device has four gear elements that are connected to an engine, two electric motors, and an output shaft, respectively, the control apparatus and method avoiding deterioration in the drive feeling of the hybrid vehicle when the rotation of a gear element of the gear elements of the differential gear device changes.
To achieve the aforementioned and other objects, a hybrid vehicle control apparatus in accordance with the invention includes an engine; first and second electric motors; an output shaft connected to a drive wheel; a differential gear device having at least four gear elements that are connected to the engine, the first and second electric motors, and the output shaft, respectively; generated control torque calculation processing means for calculating a control torque generated in association with an electrical control of the second electric motor; inertia torque calculation processing means for calculating first and second inertia torques occurring in association with changes in motor rotation speeds of the first and second electric motors; target control torque calculation processing means for calculating a control torque serving as a target for performing an electrical control of the first electric motor, based on the control torque and the first and second inertia torques; and torque control processing means for performing a torque control of the first electric motor in accordance with the control torque serving as the target.
Another hybrid vehicle control apparatus in accordance with the invention includes an engine; first and second electric motors; an output shaft connected to a drive wheel; a differential gear device having at least four gear elements that are connected to the engine, the first and second electric motors, and the output shaft, respectively; generated control torque calculation processing means for calculating a control torque generated in association with an electrical control of the second electric motor; inertia torque calculation processing means for calculating a first inertia torque that occurs in rotational elements from a rotor of the first electric motor to a gear element of the differential gear device in association with a change in a motor rotation speed of the first electric motor, and a second inertia torque that occurs in rotational elements from a rotor of the second electric motor to a gear element of the differential gear device in association with a change in a motor rotation speed of the second electric motor; target control torque calculation processing means for calculating a control torque serving as a target for performing an electrical control of the first electric motor, based on the control torque and the first and second inertia torques; and torque control processing means for performing a torque control of the first electric motor in accordance with the control torque serving as the target.
Still another hybrid vehicle control apparatus in accordance with the invention includes an engine; first and second electric motors; an output shaft connected to a drive wheel; a differential gear device having at least four gear elements that are connected to the engine, the first and second electric motors, and the output shaft, respectively; target output torque calculation processing means for calculating a target output torque of an output torque outputted to the output shaft; generated control torque calculation processing means for calculating a control torque generated in association with an electrical control of the second electric motor; inertia torque calculation processing means for calculating first and second inertia torques occurring in association with changes in motor rotation speeds of the first and second electric motors; target control torque calculation processing means for calculating, based on the control torque and the first and second inertia torques, a control torque serving as a target for performing an electrical control of the first electric motor such that the target output torque is generated; and torque control processing means for performing a torque control of the first electric motor in accordance with the control torque serving as the target.
A yet another hybrid vehicle control apparatus in accordance with the invention includes an engine; first and second electric motors; an output shaft connected to a drive wheel; a differential gear device having at least four gear elements that are connected to the engine, the first and second electric motors, and the output shaft, respectively; target output torque calculation processing means for calculating a target output torque of an output torque outputted to the output shaft; generated control torque calculation processing means for calculating a control torque generated in association with an electrical control of the second electric motor; inertia torque calculation processing means for calculating a first inertia torque that occurs in rotational elements from a rotor of the first electric motor to a gear element of the differential gear device in association with a change in a motor rotation speed of the first electric motor, and a second inertia torque that occurs in rotational elements from a rotor of the second electric motor to a gear element of the differential gear device in association with a change in a motor rotation speed of the second electric motor; target control torque calculation processing means for calculating, based on the control torque and the first and second inertia torques, a control torque serving as a target for performing an electrical control of the first electric motor such that the target output torque is generated; and torque control processing means for performing a torque control of the first electric motor in accordance with the control torque serving as the target.
The hybrid vehicle control apparatus of the invention may further include target engine revolution speed calculation processing means for calculating a target engine revolution speed of the engine; and rotation speed control processing means for performing a rotation speed control of the second el
Gotou Kenji
Yamaguchi Kozo
Aisin AW Co. Ltd.
Nguyen Thu
Oliff & Berridg,e PLC
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