US 11,703,122 B2 · Motor sticking diagnosis and repair method and device in shift-by-wire system

Abstract

A motor sticking diagnosis and repair method includes the steps of, when an operation of a shift lever is detected, determining whether a current position matches a target position, when the current position does not match the target position, rotating the motor toward the target position, determining once again whether the current position matches the target position after rotation of the motor, when the current position does not match the target position, diagnosing whether the motor sticking has occurred, when the motor is diagnosed as being stuck, allowing the motor to switch to a free-rotation mode by temporarily blocking the current being applied to the motor upon sticking diagnosis, and selecting either a first repair strategy or a second repair strategy depending on whether the position of the motor changes after switching to the free-rotation mode.

Claims17

Dependent claims

A method of diagnosing and repairing motor sticking in a Shift-By-Wire (SBW) system in which a shift range change of an automatic transmission is implemented by a motor, the method comprising:

(a) when an operation of a shift lever is detected, determining whether or not a current position of the motor matches a target position;
(b) when the current position does not match the target position, rotating the motor in a direction of the target position;
(c) determining once again whether or not the current position of the motor matches the target position after rotation of the motor;
(d) when it is determined that the current position does not match the target position, diagnosing whether or not the motor sticking has occurred;
(e) when the motor is diagnosed as being stuck, allowing the motor to switch to a free-rotation mode in which the motor is freely rotatable by temporarily blocking a current being applied to the motor at the time of diagnosis;
and
(f) selecting either a first repair strategy or a second repair strategy depending on whether or not the position of the motor changes after switching to the free-rotation mode to repair the motor sticking.

4 more elements

A device for diagnosing and repairing motor sticking in a Shift-By-Wire (SBW) system in which a shift range change of an automatic transmission is implemented by a motor, the device comprising:

a motor generating a driving force for rotating a detent plate to a target position of the detent plate;
a Hall sensor and a current sensor provided to specify a position of a rotor inside of the motor and an intensity of a current applied to the motor, respectively;
a position sensor provided to detect a signal change according to the rotation of the motor and output a PWM signal corresponding to a current shift range;
and
a Shift-By-Wire (SBW) controller configured to analyze a signal from a shift lever sensor detecting a change in a position of a shift lever to set the target position of the detent plate, and control the driving of the motor on the basis of signals of the Hall sensor and the position sensor to rotate the detent plate toward the set target position of the detent plate,
wherein the SBW controller is configured to diagnose whether or not the motor sticking has occurred from the signals of the position sensor and the current sensor, and when the motor sticking is diagnosed, to apply different repair strategies depending on a position of the motor being stuck to repair the motor sticking.

3 more elements

Dependencies are inferred from the claim text.

Motor sticking diagnosis and repair method and device in shift-by-wire system

Life of this patent

Motor sticking diagnosis and repair method and device in shift-by-wire system

Life of this patent

Abstract

Claims17