Transmission control device and learning method for synchronizer balk position

Patent metadata

Field	Value
Publication number	US-9856979-B2
Application number	US-201715417531-A
Country	US
Kind code	B2
Filing date	Jan 27, 2017
Priority date	Feb 3, 2016
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A transmission includes first and second input shafts connected via a first clutch to a power source, an output shaft, a first shift gear group including shift gears arranged between the first input and output shafts, a first switching mechanism including a synchronizer for selecting one shift gear from the group, a second shift gear group including shift gears arranged between the second input shaft and the output shaft, and a second switching mechanism including a synchronizer for selecting one shift gear from the group. In order to learn a synchronizer balk position, either the first or second shift gear group, where no targeted synchronizer belongs, is set to any shift gear, both the first and second clutches are engaged, the balk position of the synchronizer is detected in a process of the targeted synchronizer being slid, and information specifying the detected position is stored.

First claim

What is claimed is:

1. A control device for a transmission, the control device comprising a learning control means for learning a balk position of a synchronizer in the transmission, the transmission comprising:
a first input shaft connected via a first clutch to a power source;
a second input shaft connected via a second clutch to the power source;
an output shaft;
a first shift gear group comprising a plurality of shift gears arranged between the first input shaft and the output shaft, the first shift gear group for transmitting a rotation of the first input shaft via one selected shift gear to the output shaft;
a first switching mechanism for selecting one shift gear from the first shift gear group, the first switching mechanism including a synchronizer for switching the selected shift gear from a state in which power is transmittable to a state in which power is intransmittable;
a second shift gear group comprising a plurality of shift gears arranged between the second input shaft and the output shaft, the second shift gear group for transmitting a rotation of the second input shaft via one selected shift gear to the output shaft; and
a second switching mechanism for selecting one shift gear from the second shift gear group, the second switching mechanism including a synchronizer for switching the selected shift gear from the state in which power is transmittable to the state in which power is intransmittable,
wherein the learning control means, in order to learn a balk position of one synchronizer, sets either the first or second shift gear group, to which the one synchronizer targeted for learning never belongs, to an arbitrary shift gear, engages both the first and second clutches, detects the balk position of the synchronizer in a process in which the synchronizer targeted for learning is slid, and stores information specifying the detected balk position.

2. The control device for the transmission according to claim 1 ,
wherein the first shift gear group includes a lowest shift gear,
wherein the lowest shift gear is configured to transmit a rotation of the first input shaft via a one-way clutch to the output shaft without being selected by the first switching mechanism, and
wherein the learning control means learns a balk position of a synchronizer at least belonging to the first shift gear group.

3. A learning method for a synchronizer balk position in a transmission, the transmission comprising:
a first input shaft connected via a first clutch to a power source;
a second input shaft connected via a second clutch to the power source;
an output shaft;
a first shift gear group comprising a plurality of shift gears arranged between the first input shaft and the output shaft, the first shift gear group for transmitting a rotation of the first input shaft via one selected shift gear to the output shaft;
a first switching mechanism for selecting one shift gear from the first shift gear group, the first switching mechanism including a synchronizer for switching the selected shift gear from a state in which power is transmittable to a state in which power is intransmittable;
a second shift gear group comprising a plurality of shift gears arranged between the second input shaft and the output shaft, the second shift gear group for transmitting a rotation of the second input shaft via one selected shift gear to the output shaft; and
a second switching mechanism for selecting one shift gear from the second shift gear group, the second switching mechanism including a synchronizer for switching the selected shift gear from the state in which power is transmittable to the state in which power is intransmittable,
wherein the learning method comprising:
in order to learn a balk position of one synchronizer, setting either the first or second shift gear group, to which the one synchronizer targeted for learning never belongs, to an arbitrary shift gear,
engaging both the first and second clutches,
detecting a balk position of the synchronizer in a process in which the synchronizer targeted for learning is slid, and
storing information specifying the detected balk position.

4. The learning method according to claim 3 wherein the output shaft is configured to idle while both the first and second clutches are in engagement.

Assignees

• Honda Motor Co Ltd

Inventors

• Taka Shohei
• Hanai Eiji

Classifications

• F16H61/12

  Detecting malfunction or potential malfunction, e.g. fail safe (in control of hydrostatic gearing F16H61/4192) {; Circumventing or fixing failures} · CPC title

• F16H61/688 Primary

  with two inputs, e.g. selection of one of two torque-flow paths by clutches · CPC title

• F16H3/093

  with two or more countershafts · CPC title

• F16H3/006

  power being selectively transmitted by parallel flow paths, e.g. dual clutch transmissions · CPC title

• F16H2342/04

  Calibrating engagement of friction elements · CPC title