# US 2013/0252784 A1 · Failsafe device for shift-by-wire system

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- Number: US 2013/0252784 A1
- Document ID: US20130252784A1
- Status: Published application
- Kind: A1
- Application number: 13/794,605
- Filed: 2013-03-11
- Published: 2013-09-26
- Earliest claimed: 2012-03-23
- Assignees: Fuji Jukogyo Kabushiki Kaisha
- Applicants: Fuji Jukogyo Kabushiki Kaisha
- Inventors: Takahiro Kinoshita; Koichi Inoue
- Web page: https://patentgrep.com/patent/US20130252784A1

## CPC

- B60W 10/184: with wheel brakes
- B60W 10/11: Stepped gearings
- B60W 10/182: {including control of parking brakes}
- F16H 61/12: Detecting malfunction or potential malfunction, e.g. fail safe (in control of hydrostatic gearing F16H61/4192) {; Circumventing or fixing failures}
- F16H 63/48: Signals to a parking brake {or parking lock; Control of parking locks or brakes being part of the transmission}
- F16H 63/486: {Common control of parking locks or brakes in the transmission and other parking brakes, e.g. wheel brakes}
- B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- F16H: GEARING

## Abstract

There is provided a failsafe device for a shift-by-wire system, including: a parking range operation unit with which a diver inputs a request to shift to a parking range; a control unit that changes the state of an automatic transmission to a parking range state in response to the shift request from the parking range operation unit; a failure determination unit that determines whether or not the actual state of the automatic transmission is the parking range state; and a brake device that brakes wheels of a vehicle with an actuator. The control unit brakes the wheels with the brake device when the failure determination unit determines that the actual state of the automatic transmission is not the parking range state after the request to shift to the parking range has been issued from the parking range operation unit.

## Claims

### Claim 1

A failsafe device for a shift-by-wire system, comprising:
a parking range operation unit to allow a diver to input a request to shift to a parking range;
a control unit to change a state of an automatic transmission to a parking range state in response to the shift request from the parking range operation unit;
a failure determination unit to determine whether or not an actual state of the automatic transmission is the parking range state; and
a brake device that brakes wheels of a vehicle with an actuator, wherein
the control unit brakes the wheels with the brake device when the failure determination unit determines that the actual state of the automatic transmission is not the parking range state after the request to shift to the parking range has been issued from the parking range operation unit.

### Claim 2 (depends on 1)

The failsafe device for a shift-by-wire system according to claim 1, wherein
the brake device is an electric parking brake device in which a parking brake is driven by an electric actuator.

### Claim 3 (depends on 1)

The failsafe device for a shift-by-wire system according to claim 1, wherein
the automatic transmission has a lock mechanism that is driven by an actuator and locks the rotation of an output shaft when shifting is performed to the parking range, and
the failure determination unit determines whether or not the actual state of the automatic transmission is the parking range state on the basis of drive position information of the actuator.