SHIFT POSITION SWITCHING DEVICE

• US 20160003349A1
• Filed: 07/01/2015
• Published: 01/07/2016
• Est. Priority Date: 07/02/2014
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: KIMURA, Kiyoshi, YAMADA, Jun
• Granted Patent: US 10,144,282 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60K 23/02 for main transmission clutches
• CPC Class Codes: B60K 2702/02 Automatic transmission with toothed gearing
• CPC Class Codes: B60Y 2300/70 Control of gearings
• CPC Class Codes: F16H 2061/0087 Adaptive control, e.g. the control parameters adapted by learning
• CPC Class Codes: F16H 2061/326 Actuators for range selection, i.e. actuators for controlling the range selector or the manual range valve in the transmission
• CPC Class Codes: F16H 59/105 consisting of electrical switches or sensors
• CPC Class Codes: F16H 61/32 Electric motors actuators or related electrical control means therefor

Abstract

A shift position switching device for shifting gears in association with a shift position. The device includes a shift mechanism switching between shift positions using a drive power of a motor, an encoder outputting pulse signals in sync with a rotation of the motor, and a controller rotating the motor to a target rotation position corresponding to an intended gear. The controller rotates the motor toward a dead-end on a first shift position side of the shift mechanism while observing a motor rotation speed or an acceleration of rotation of the motor based on the outputted pulse signals of the encoder. Also, the controller learns, as a reference position on the first shift position side, a first rotation position of the motor.

Claims

1. A shift position switching device for shifting gears in association with a shift position, the device comprising:

a shift mechanism switching between shift positions using a drive power of a motor;

an encoder outputting pulse signals in sync with a rotation of the motor; and

a controller rotating the motor to a target rotation position corresponding to an intended gear, wherein

the controller rotates the motor toward a dead-end on a first shift position side of the shift mechanism while observing a motor rotation speed or an acceleration of rotation of the motor based on the outputted pulse signals of the encoder, and

the controller learns, as a reference position on the first shift position side, a first rotation position of the motor at which a fall of the motor rotation speed or a fall of the acceleration of rotation of the motor down to or below a threshold value is observed.

2. The shift position switching device of claim 1, wherein

the controller sets a reference position on a second shift position side based on (i) a rotatable amount of the motor for the switching between a first shift position and a second shift position, and (ii) the reference position on the first shift position side.

3. The shift position switching device of claim 1, wherein

when the switching from the first shift position to a second shift position is performed,

the controller rotates the motor toward a dead-end on the second shift position side of the shift mechanism while observing the motor rotation speed or the acceleration of the rotation of the motor based on the outputted pulse signals of the encoder, and

the controller learns, as a reference position on the second shift position side, a second rotation position of the motor at which the fall of the motor rotation speed or the fall of the acceleration of rotation of the motor down to or below the threshold value is observed.

4. The shift position switching device of claim 1, wherein

the controller rotates at a preset timing the motor toward another dead-end on a second shift position side that is different from the first shift position side, for a correction of secular change influence on the shift mechanism, while observing the motor rotation speed or the acceleration of rotation of the motor based on the outputted pulse signals of the encoder, and

the controller learns, as a reference position on the second shift position side, the rotation position of the motor at which the fall of the motor rotation speed or the fall of the acceleration of rotation of the motor down to or below the threshold value is observed.

5. The shift position switching device of claim 3, wherein

the controller calculates a rotatable amount of the motor based on the reference position on the first shift position side and the reference position on the second shift position side.

6. The shift position switching device of claim 1, wherein

the controller controls a rotational drive of the motor so that a per-unit-time output of the motor becomes smaller at a time of the learning of the reference position than at a time of the switching between the shift positions.

7. The shift position switching device of claim 1, wherein

the controller sets the target rotation position of the motor for the switching between the shift positions based on at least one of the reference position on the first shift position side and a reference position on a second shift position side.

8. The shift position switching device of claim 7, wherein

at the time of the switching between the shift positions, the controller controls the rotation of the motor so that a rotation position of the motor matches the target rotation position.