Automatic transmission control device

Patent metadata

Field	Value
Publication number	US-9874278-B2
Application number	US-201314768835-A
Country	US
Kind code	B2
Filing date	Dec 27, 2013
Priority date	Mar 13, 2013
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

A control device for an automatic transmission disposed in a vehicle driving system, the automatic transmission having an engaging clutch as shift element, has a shift controller that performs a shift control of the automatic transmission. The shift controller is configured such that, during a shift control to release the engaging clutch in response to a first shift request and after determination of a releasing start of the engaging clutch, when a second shift request to engage the engaging cutch is generated, the shift control in response to the first shift request will be continued.

First claim

The invention claimed is:

1. A control device for an automatic transmission disposed in a vehicle driving system, the automatic transmission having an engaging clutch as shift element and a friction clutch for switching shift from the engaging clutch, comprising:
a shift controller that performs a shift control of the automatic transmission to release the engaging clutch to connect the friction clutch,
wherein the shift controller is configured such that, during the shift control to release the engaging clutch in response to a first shift request and after determination of a releasing start of the engaging clutch, when a second shift request to engage the engaging clutch is generated, the shift control in response to the first shift request will be continued,
wherein the engaging clutch is controlled by allowing an actuator for the engaging clutch to stroke for engagement/release, and
wherein the shift controller determines the releasing start of the engaging clutch when the actuator for the engaging clutch strokes towards a releasing side.

2. The control device for an automatic transmission as claimed in claim 1 ,
wherein the automatic transmission comprises the engaging clutch and a friction clutch for switching shift from the engaging clutch,
wherein the shift controller sets the transmission torque of the friction clutch in a case in which the shift control in response to the first shift request is continued despite the second shift request being generated greater than the transmission torque of the friction clutch during the shift control in response to the first shift request without the second shift request being generated.

3. A control device for an automatic transmission disposed in a vehicle driving system, the automatic transmission having an engaging clutch as shift element, comprising:
a shift controller that performs a shift control of the automatic transmission,
wherein the shift controller is configured such that, during a shift control to release the engaging clutch in response to a first shift request and after determination of a releasing start of the engaging clutch, when a second shift request to engage the engaging clutch is generated, the shift control in response to the first shift request will be continued,
wherein the engaging clutch is controlled by allowing an actuator for the engaging clutch to stroke for engagement/release,
wherein the shift controller determines the releasing start of the engaging clutch when the actuator for the engaging clutch strokes towards a releasing side,
wherein the shift controller is further configured such that, during the shift control to release the engaging clutch in response to the first shift request and before determination of the releasing start of the engaging clutch, when the second shift request to engage the engaging clutch is generated, the shift control in response to the second shift request will be executed.

4. The control device for an automatic transmission as claimed in claim 3 , wherein the shift controller determines the releasing start of the engaging clutch when a releasing request has been output to the engaging clutch.

5. The control device for an automatic transmission as claimed in claim 3 ,
wherein the automatic transmission comprises the engaging clutch and a friction clutch for switching shift from the engaging clutch,
wherein the shift controller sets the transmission torque of the friction clutch in a case in which the shift control in response to the first shift request is continued despite the second shift request being generated greater than the transmission torque of the friction clutch during the shift control in response to the first shift request without the second shift request being generated.

6. The control device for an automatic transmission as claimed in claim 4 ,
wherein the automatic transmission comprises the engaging clutch and a friction clutch for switching shift from the engaging clutch,
wherein the shift controller sets the transmission torque of the friction clutch in a case in which the shift control in response to the first shift request is continued despite the second shift request being generated greater than the transmission torque of the friction clutch during the shift control in response to the first shift request without the second shift request being generated.

Assignees

• Nissan Motor

Inventors

• Toyota Ryohey
• Tsukizaki Atsushi
• Hibi Toshifumi
• Kaneko Yutaka

Classifications

• F16H61/16 Primary

  Inhibiting  {or initiating}  shift during unfavourable conditions  {, e.g. preventing forward-reverse shift at high vehicle speed, preventing engine overspeed}   (F16H61/18 takes precedence) · CPC title

• F16H2306/24

  Interruption of shift, e.g. if new shift is initiated during ongoing previous shift · CPC title

• F16H61/0204

  for gearshift control, e.g. control functions for performing shifting or generation of shift signal · CPC title