Shift position switch controller

Patent metadata

Field	Value
Publication number	US-9970539-B2
Application number	US-201715428436-A
Country	US
Kind code	B2
Filing date	Feb 9, 2017
Priority date	Feb 12, 2016
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A shift position switch controller includes a reference position learner, learning a reference rotation position of an electric motor in a reference shift position, a target position setter, while setting a target rotation position based on an absolute rotation position detected by an absolute position detector until a satisfaction of a first condition, which is an initialization of a learned reference rotation position in the reference shift position or a second condition, which is a post-switch shift position being set as the reference shift position in a shift position switch instruction that is input after the initialization of the learned reference rotation position, and setting the target rotation position based on a rotation position that is detected by a rotation position detector with reference to the reference rotation position serving as a rotation start position.

First claim

What is claimed is:

1. A shift position switch controller that performs a switch control a transmission, comprising:
a rotation position detector detecting a rotation position of an electric motor;
an absolute rotation position detector detecting an absolute rotation position of an output shaft;
a reference position learner learning a reference rotation position of the electric motor in a reference shift position, the reference shift position being one of a plurality of shift positions;
a target position setter that
(A) sets a target rotation position of the electric motor according to a shift position switch instruction that is based on the absolute rotation position detected by the absolute rotation position detector, until a satisfaction of a first condition or a second condition, and
(B) sets the target rotation position according to a shift position switch instruction that is based on the rotation position that is detected by the rotation position detector, with reference to the reference rotation position serving as a rotation start position, after the satisfaction of the first condition or the second condition, wherein
the first condition is defined as an initialization of a learned reference rotation position learned by the reference position learner in the reference shift position, and
the second condition is defined as a post-switch shift position being set as the reference shift position in the shift position switch instruction that is input after the initialization of the learned reference rotation position; and

a rotation controller controlling the rotation position of the electric motor toward the target rotation position, based on a detected rotation position detected by the rotation position detector.

2. The shift position switch controller of claim 1 , wherein
the rotation controller regulates a rotation speed of the electric motor under a regulated speed until a satisfaction of the first condition or the second condition, the regulated speed being lower than a rotation speed after the satisfaction of the first condition or the second condition.

3. The shift position switch controller of claim 2 , wherein
the rotation control section controls the rotation speed of the electric motor to a further-lower regulated speed, after a detection of the absolute rotation position by the absolute position detector corresponding to a post-switch shift position in the shift position switch instruction, until the first condition or the second condition is satisfied, the further-lower regulated speed being lower than the regulated speed.

4. The shift position switch controller of claim 1 , wherein
the target position setter sets, prior to setting the target rotation position, a temporary target rotation position to a far side position on a far side of the reference rotation position that is based on the detected rotation position detected by the rotation position detector with reference to the rotation start position, after the first condition or the second condition is satisfied.

5. The shift position switch controller of claim 4 further comprising:
a stopper mechanically stopping a rotation of the electric motor beyond the reference rotation position.

Assignees

• Denso Corp
• Honda Motor Co Ltd

Inventors

• Sakaguchi Koji
• Iwata Masayoshi
• Takemori Yuichiro
• Mori Taizo

Classifications

• F16H2061/283

  Adjustment or calibration of actuator positions, e.g. neutral position · CPC title

• F16H2061/2823

  Controlling actuator force way characteristic, i.e. controlling force or movement depending on the actuator position, e.g. for adapting force to synchronisation and engagement of gear clutch · CPC title

• F16H61/32 Primary

  Electric motors  {, actuators or related electrical control means}  therefor · CPC title

• F16H2061/0087

  Adaptive control, e.g. the control parameters adapted by learning · CPC title

• F16H61/00

  Control functions within {control units of} change-speed- or reversing-gearings for conveying rotary motion {; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing} · CPC title