Shift control device for continuously variable transmission

Patent metadata

Field	Value
Publication number	US-2015152962-A1
Application number	US-201414549974-A
Country	US
Kind code	A1
Filing date	Nov 21, 2014
Priority date	Dec 3, 2013
Publication date	Jun 4, 2015
Grant date	—

Abstract

A transmission control device includes a converter that converts continuous accelerator positions detected by an accelerator pedal sensor into a stepped step position, and a controller that controls the gear ratio of a continuously variable transmission based on the converted step position. The converter creates a hysteresis regarding the converted step position, when the accelerator depression amount increases, and when the accelerator depression amount decreases. In the case where the step position reaches a predetermined position or greater, the controller executes kick-down control where the gear ratio is controlled to a low side.

First claim

1 . A shift control device for a continuously variable transmission, the shift control device comprising:
a detector that detects an accelerator operation amount; a converter that converts a continuous operation amount detected by the detector into a stepped operation amount; and a controller that controls a gear ratio of the shift control device based on the stepped operation amount converted by the converter.

2 . The shift control device for a continuously variable transmission according to claim 1 , wherein the converter creates a hysteresis regarding the stepped operation amount which is converted, when an accelerator operation amount increases, and when the accelerator operation amount decreases.

3 . The shift control device for a continuously variable transmission according to claim 1 , wherein, in the case where the stepped operation amount reaches a predetermined amount or greater, the controller executes kick-down control where the gear ratio is controlled to a low side.

4 . The shift control device for a continuously variable transmission according to claim 2 , wherein, in the case where the stepped operation amount reaches a predetermined amount or greater, the controller executes kick-down control where the gear ratio is controlled to a low side.

5 . The shift control device for a continuously variable transmission according to claim 3 , wherein, in the case where, during executing of the kick-down control, the number of steps of the stepped operation amount has increased by an amount equal to or greater than a first number of steps as compared to the point when the kick-down control was started, the controller starts the kick-down control again.

6 . The shift control device for a continuously variable transmission according to claim 4 , wherein, in the case where, during executing of the kick-down control, the number of steps of the stepped operation amount has increased by an amount equal to or greater than a first number of steps as compared to the point when the kick-down control was started, the controller starts the kick-down control again.

7 . The shift control device for a continuously variable transmission according to claim 3 , wherein, in the case where, during executing of the kick-down control, the number of steps of the stepped operation amount has decreased by an amount equal to or greater than a second number of steps as compared to the point when the kick-down control was started, the controller controls the gear ratio to a high side.

8 . The shift control device for a continuously variable transmission according to claim 4 , wherein, in the case where, during executing of the kick-down control, the number of steps of the stepped operation amount has decreased by an amount equal to or greater than a second number of steps as compared to the point when the kick-down control was started, the controller controls the gear ratio to a high side.

9 . The shift control device for a continuously variable transmission according to claim 5 , wherein, in the case where, during executing of the kick-down control, the number of steps of the stepped operation amount has decreased by an amount equal to or greater than a second number of steps as compared to the point when the kick-down control was started, the controller controls the gear ratio to a high side.

10 . The shift control device for a continuously variable transmission according to claim 6 , wherein, in the case where, during executing of the kick-down control, the number of steps of the stepped operation amount has decreased by an amount equal to or greater than a second number of steps as compared to the point when the kick-down control was started, the controller controls the gear ratio to a high side.

11 . The shift control device for a continuously variable transmission according to claim 3 , wherein, in the case where, during executing of the kick-down control, the number of steps of the stepped operation amount has decreased by an amount equal to or greater than a third number of steps as compared to the point when the kick-down control was started, the controller disengages the kick-down control.

12 . The shift control device for a continuously variable transmission according to claim 4 , wherein, in the case where, during executing of the kick-down control, the number of steps of the stepped operation amount has decreased by an amount equal to or greater than a third number of steps as compared to the point when the kick-down control was started, the controller disengages the kick-down control.

13 . The shift control device for a continuously variable transmission according to claim 5 , wherein, in the case where, during executing of the kick-down control, the number of steps of the stepped operation amount has decreased by an amount equal to or greater than a third number of steps as compared to the point when the kick-down control was started, the controller disengages the kick-down control.

14 . The shift control device for a continuously variable transmission according to claim 6 , wherein, in the case where, during executing of the kick-down control, the number of steps of the stepped operation amount has decreased by an amount equal to or greater than a third number of steps as compared to the point when the kick-down control was started, the controller disengages the kick-down control.

15 . The shift control device for a continuously variable transmission according to claim 3 , wherein, during executing of the kick-down control, the controller executes upshift control when predetermined engine speed is reached, and changes a gearshift speed in accordance with the number of times of having executed upshift control.

16 . The shift control device for a continuously variable transmission according to claim 4 , wherein, during executing of the kick-down control, the controller executes upshift control when predetermined engine speed is reached, and changes a gearshift speed in accordance with the number of times of having executed upshift control.

17 . The shift control device for a continuously variable transmission according to claim 5 , wherein, during executing of the kick-down control, the controller executes upshift control when predetermined engine speed is reached, and changes a gearshift speed in accordance with the number of times of having executed upshift control.

18 . The shift control device for a continuously variable transmission according to claim 6 , wherein, during executing of the kick-down control, the controller executes upshift control when predetermined engine speed is reached, and changes a gearshift speed in accordance with the number of times of having executed upshift control.

Assignees

• Fuji Heavy Ind Ltd

Inventors

• Ajimoto Keisuke

Classifications

• F16H61/66 Primary

  specially adapted for continuously variable gearings (control of exclusively fluid gearing F16H61/38) · CPC title

• F16H59/24

  dependent on the throttle opening · CPC title

• F16H61/6648 Primary

  controlling of shifting being influenced by a signal derived from the engine and the main coupling · CPC title

• F16H61/66259 Primary

  using electrical or electronical sensing or control means · CPC title

• F16H59/20

  Kickdown · CPC title