Vehicle regenerative speed control device

Patent metadata

Field	Value
Publication number	US-2018106367-A1
Application number	US-201515556374-A
Country	US
Kind code	A1
Filing date	Mar 20, 2015
Priority date	Mar 20, 2015
Publication date	Apr 19, 2018
Grant date	—

Abstract

A vehicle regenerative speed control device is provided for suppressing undershooting, in which an actual transmission input rotational speed falls below a lower-limit rotational speed, when decreasing a transmission input rotational speed based on a request for a decrease in the regeneration amount during regenerative speed control. The vehicle regenerative speed control device includes a controller which performs a regenerative speed control for downshifting a continuously variable transmission to a low gear ratio side and increasing a rotational speed of a transmission input shaft to which a motor generator is connected when there is a request for an increase in the regeneration amount while decelerating.

First claim

1 . A vehicle regenerative speed for a vehicle having a continuously variable transmission, an electric motor connected to an input shaft side of the continuously variable transmission and that regenerates energy during deceleration, and an oil pump connected to the input shaft side of the continuously variable transmission, in which a rotational speed for producing a necessary hydraulic pressure to the continuously variable transmission during deceleration is set as a lower-limit rotational speed;
the vehicle regenerative speed control device comprising a controller configured to perform a regenerative speed control for downshifting the continuously variable transmission to a low gear ratio side and increasing a transmission input rotational speed of a transmission input shaft to which the electric motor is connected upon receiving a request for an increase in a regeneration amount while decelerating; the controller being further configured to perform a control for making a rotational speed decrease change rate of the transmission input rotational speed lower than a rotational speed increase change rate of the transmission input rotational speed, when the transmission input rotational speed is decreased based on a request for a decrease in the regeneration amount during regenerative speed control.

2 . The vehicle regenerative speed control device according to claim 1 , wherein
the controller carries out a shift control by other than an upshift control, as the shift control for the continuously variable transmission upon receiving a request for a decrease in the regeneration amount during regenerative speed control.

3 . The vehicle regenerative speed control device according to claim 2 , wherein
the controller carries out a control to decrease the transmission input rotational speed along a constant gear ratio line of the continuously variable transmission, upon receiving the request for the decrease in the regeneration amount during regenerative speed control, and switches from the constant gear ratio line to a down gear ratio line to decrease the transmission input rotational speed, when the transmission input rotational speed approaches the lower-limit rotational speed.

4 . The vehicle regenerative speed control device according to claim 3 , wherein
the controller carries out a control to decrease the transmission input rotational speed by switching from the constant gear ratio line to the down gear ratio line, when the operation point at the time of decrease start is in the low gear ratio side region.

Assignees

• Nissan Motor

Inventors

• Mouri Takanobu
• Yoshino Takahiro
• Kageyama Yuuzou
• Ono Masashi
• Maruyama Hideki
• Ishizuka Takuya

Classifications

• B60W10/10

  including control of change-speed gearings · CPC title

• B60W2520/10

  Longitudinal speed · CPC title

• B60W30/18127

  Regenerative braking · CPC title

• B60K6/442

  Series-parallel switching type · CPC title

• B60W20/00

  Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)} · CPC title