# US 8,788,167 B2 · Control system of transmission

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- Number: US 8,788,167 B2
- Document ID: US8788167B2
- Status: Granted
- Kind: B2
- Application number: 12/356,796
- Filed: 2009-01-21
- Published: 2009-10-08
- Granted: 2014-07-22
- Earliest claimed: 2008-04-07
- Assignees: Mitsubishi Electric Corporation
- Applicants: Osamu Ishikawa; Takeru Okabe; Nozomu Kamioka; Tomohisa Shoda; Masaki Horii; Yasufumi Ogawa; Shiro Yonezawa
- Inventors: Osamu Ishikawa; Takeru Okabe; Nozomu Kamioka; Tomohisa Shoda; Masaki Horii; Yasufumi Ogawa; Shiro Yonezawa
- Web page: https://patentgrep.com/patent/US8788167B2

## CPC

- F16D 48/064: {Control of electrically or electromagnetically actuated clutches (F16D48/062, F16D48/068 take precedence)}
- F16D 2500/3022: Current
- F16D 2500/501: Relating the actuator
- F16D 2500/70418: Current
- F16D 2500/7061: Feed-back
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES

## Abstract

A clutch control unit includes a clutch motor controller that controls a clutch motor. The clutch motor controller has a target clutch motor current computing unit that computes a target clutch motor current for adjusting torque of the clutch motor to be torque corresponding to an operating state of the vehicle, and a motor driving and braking selection unit that selects a motor driving mode in which the clutch motor is driven by applying feedback control on an output of the clutch motor or a motor braking mode in which the clutch motor is braked by short-circuiting the clutch motor according to a difference between the target clutch motor current and an actually detected clutch motor current. It thus becomes possible to provide a control system of a transmission that engages a clutch by a motor braking force in a manner that suits the running state of the vehicle.

## Claims

### Claim 1

A control system of a transmission comprising:
an engine mounted on a vehicle;
a transmission having a clutch formed of an engine clutch that is connected to an output shaft of the engine so as to transmit motive power of the engine to a transmission assembly portion and a transmission assembly clutch; and
a clutch control unit that engages and disengages the clutch,
wherein the clutch control unit has a clutch motor and a clutch motor controller that controls the clutch motor, and is configured to make the rotation angle of the clutch motor proportional to a stroke volume of the automatic transmission assembly clutch,
wherein the clutch motor controller has:
a target clutch motor current computing unit that computes a target clutch motor current for adjusting torque of the clutch motor to be torque corresponding to an operating state of the vehicle; and
a motor driving and braking selection unit that selects one of a motor driving mode in which the clutch motor is driven by applying feedback control to an output of the clutch motor and a motor braking mode in which the clutch motor is braked by short-circuiting the clutch motor so as to generate braking torque in a direction opposite to the force that causes the automatic transmission assembly clutch to stroke to the disengagement side, and
wherein, in a case where a difference between the rotation number of the engine clutch and the rotation number of the transmission assembly clutch is larger than a predetermined value in the motor braking mode, the motor driving mode is selected by the motor driving and braking unit for driving the clutch motor.