Hybrid vehicle control device

Patent metadata

Field	Value
Publication number	US-2016193994-A1
Application number	US-201314917058-A
Country	US
Kind code	A1
Filing date	Oct 4, 2013
Priority date	Oct 4, 2013
Publication date	Jul 7, 2016
Grant date	—

Abstract

A hybrid vehicle control device for a drive system is provided with an engine, a motor and an automatic transmission. The hybrid vehicle control device is configured such that when there is a mode switch request during an EV mode where only the motor is used as a drive source, a shift is made to an HEV mode where the engine and the motor are used as drive sources. The hybrid vehicle control device is further configured such that if a mode switch request and a downshift request for the automatic transmission (are generated, mode switch control is immediately started first. The configuration is also such that downshift control is started once the rotational speed of the engine has reached a combustion possible rotational speed, and the transmission speed at this time is made to be faster than an ordinary transmission speed.

First claim

1 . A hybrid vehicle control device for controlling a drive system including an engine, a motor, a first clutch that is interposed between the engine and the motor, and an automatic transmission, the hybrid vehicle control device comprising:
a hybrid control module programmed to shift from an electric vehicle traveling mode where only the motor is a drive source to a hybrid vehicle traveling mode where the engine and the motor are drive sources upon receiving a mode switch request during the electric vehicle traveling mode; the hybrid control module being further programmed to immediately starts a mode switch control, which shifts from the electric vehicle traveling mode to the hybrid vehicle traveling mode by engaging the first clutch and starting the engine, and starts a downshift control once a rotational speed of the engine has reached a combustion possible rotational speed, upon generation of both the mode switch request and a downshift request of the automatic transmission, the hybrid control module being further programmed to comprise a transmission speed control section which sets a transmission speed during the downshift control to be faster than the transmission speed during the downshift control when only a downshift request of the automatic transmission is generated.

2 . The hybrid vehicle control device according to claim 1 , wherein
the transmission speed control section is programmed to increase the transmission speed during the downshift control as a required driving force of the driver is increased.

3 . The hybrid vehicle control device according to claim 1 , comprising:
a timer that detects a stopped time of the engine before the mode switch control is started, wherein the transmission speed control section is programmed to decrease the transmission speed during the downshift control when the stopped time of the engine is short as compared to the transmission speed during the downshift control when the stopped time of the engine is long.

4 . The hybrid vehicle control device according to claim 1 , comprising:
a vehicle speed sensor that detects the vehicle speed, wherein the transmission speed control section is programmed to decrease the transmission speed during the downshift control when the vehicle speed is fast as compared to the transmission speed during the downshift control when the vehicle speed is slow.

5 . The hybrid vehicle control device according to claim 3 , wherein
the transmission speed control section is programmed to increase the transmission speed during the downshift control after the first clutch is engaged as compared to the transmission speed during the downshift control before the first clutch is engaged.

6 . The hybrid vehicle control device according to claim 1 , comprising:
an accelerator position opening amount sensor that detects an accelerator position opening amount, the transmission speed control section being programmed to decrease the transmission speed during the downshift control upon determining that the accelerator position opening amount is at a low opening amount and an accelerator depression speed is low as compared to the transmission speed during a downshift control when only the downshift request of the automatic transmission has been generated.

7 . The hybrid vehicle control device according to claim 2 , comprising:
a timer that detects a stopped time of the engine before the mode switch control is started, wherein the transmission speed control section is programmed to decrease the transmission speed during the downshift control when the stopped time of the engine is short as compared to the transmission speed during the downshift control when the stopped time of the engine is long.

8 . The hybrid vehicle control device according to claim 2 , comprising
a vehicle speed sensor that detects the vehicle speed, wherein the transmission speed control section is programmed to decrease the transmission speed during the downshift control when the vehicle speed is fast as compared to—the transmission speed during the downshift control when the vehicle speed is slow.

9 . The hybrid vehicle control device according to claim 4 , wherein
the transmission speed control section is programmed to increase the transmission speed during the downshift control after the first clutch is engaged as compared to the transmission speed during the downshift control before the first clutch is engaged.

10 . The hybrid vehicle control device according to claim 2 , comprising
an accelerator position opening amount sensor that detects an accelerator position opening amount, the transmission speed control section being programmed to decrease the transmission speed during the downshift control upon determining that the accelerator position opening amount is at a low opening amount and an accelerator depression speed is low as compared to the transmission speed during a downshift control when only the downshift request of the automatic transmission has been generated.

11 . The hybrid vehicle control device according to claim 3 , comprising
a vehicle speed sensor that detects the vehicle speed, wherein the transmission speed control section is programmed to decrease the transmission speed during the downshift control when the vehicle speed is fast as compared to—the transmission speed during the downshift control when the vehicle speed is slow.

12 . The hybrid vehicle control device according to claim 11 , wherein
the transmission speed control section is programmed to increase the transmission speed during the downshift control after the first clutch is engaged as compared to the transmission speed during the downshift control before the first clutch is engaged.

13 . The hybrid vehicle control device according to claim 12 , comprising
an accelerator position opening amount sensor that detects an accelerator position opening amount, the transmission speed control section being programmed to decrease the transmission speed during the downshift control upon determining that the accelerator position opening amount is at a low opening amount and an accelerator depression speed is low as compared to the transmission speed during a downshift control when only the downshift request of the automatic transmission has been generated.

14 . The hybrid vehicle control device according to claim 3 , comprising
an accelerator position opening amount sensor that detects an accelerator position opening amount, the transmission speed control section being programmed to decrease the transmission speed during the downshift control upon determining that the accelerator position opening amount is at a low opening amount and an accelerator depression speed is low as compared to the transmission speed during a downshift control when only the downshift request of the automatic transmission has been generated.

15 . The hybrid vehicle control device according to claim 4 , comprising
an accelerator position opening amount sensor that detects an accelerator position opening amount, the transmission speed control section being programmed to decrease the transmission speed during the downshift control upon determining that the accelerator position opening amount is at a low opening amount and an accelerator depression speed is low as compared to the transmission speed during a downshift control when only the downshift request of the automatic transmission has been generated.

16 . The hybrid vehicle control device according to claim 5 , comprising
an accelerator position opening amount sensor that detects an accelerator position opening amount,

Assignees

• Nissan Motor

Inventors

• Ando Takao
• Ito Ryosuke

Classifications

• B60W2400/00

  Indexing codes relating to detected, measured or calculated conditions or factors · CPC title

• B60W2520/10

  Longitudinal speed · CPC title

• B60W10/11

  Stepped gearings · CPC title

• B60W10/08

  including control of electric propulsion units, e.g. motors or generators · CPC title

• B60W2710/1005

  Transmission ratio engaged · CPC title