Vehicle and control device for vehicle
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsYosuke Akiyama, Akira Ijichi, Taichi Kobayashi, Koji Takaira, Akinori Homan, Yoshio Itou, Kunihiko Usui
Life of this patent
Estimating the term…
Abstract
When temperature of a second power source of a vehicle becomes higher than a threshold value during a first mode in which three rotating elements of a differential gear can make differential movement and when four-wheel drive is needed, switching is performed to a second mode in which the three rotating elements are unified, and when four-wheel drive is not needed even when the temperature of the second power source becomes higher than the threshold value during the first mode, output of the second power source is restricted, while the first mode is maintained.
Claims15
A vehicle comprising a transmission system,
- the transmission system including:
- a first input shaft to which motive power from a first power source is input;
- a second input shaft to which motive power from a second power source is input;
- a first output shaft that outputs the motive power to a first drive wheel;
- a second output shaft that outputs the motive power to a second drive wheel;
- a differential gear including, as three rotating elements,
- a first rotating element to which the second input shaft is coupled,
- a second rotating element to which the second output shaft is coupled, and
- a third rotating element to which the first output shaft is coupled;
- and
- an engagement device that selectively couples any two rotating elements of the three rotating elements, and
- the transmission system being capable of switching between a first mode in which the engagement device is released and the three rotating elements can make differential movement, and a second mode in which the engagement device is engaged and the three rotating elements are mechanically unified,
- wherein when temperature of the second power source becomes higher than a threshold value during the first mode and when both the first drive wheel and the second drive wheel need to be driven, switching is performed from the first mode to the second mode, and when the first drive wheel and the second drive wheel do not both need to be driven even when the temperature of the second power source becomes higher than the threshold value during the first mode, output of the second power source is restricted, while the first mode is maintained.
A control device for a vehicle equipped with a transmission system,
- the transmission system including:
- a first input shaft to which motive power from a first power source is input;
- a second input shaft to which motive power from a second power source is input;
- a first output shaft that outputs the motive power to a first drive wheel;
- a second output shaft that outputs the motive power to a second drive wheel;
- a differential gear including, as three rotating elements,
- a first rotating element to which the second input shaft is coupled,
- a second rotating element to which the second output shaft is coupled, and
- a third rotating element to which the first output shaft is coupled;
- and
- an engagement device that selectively couples any two rotating elements of the three rotating elements, and
- the transmission system being capable of switching between a first mode in which the engagement device is released and the three rotating elements can make differential movement, and a second mode in which the engagement device is engaged and the three rotating elements are mechanically unified,
- the control device comprising a control section that switches a state of the differential gear from the first mode to the second mode when temperature of the second power source becomes higher than a threshold value during the first mode and when both the first drive wheel and the second drive wheel need to be driven,
- wherein when the first drive wheel and the second drive wheel do not both need to be driven even when the temperature of the second power source becomes higher than the threshold value during the first mode, the control section restricts output of the second power source, while maintaining the first mode.
Dependencies are inferred from the claim text.