Controller and shift-by-wire system using the controller

Patent metadata

Field	Value
Publication number	US-2016025214-A1
Application number	US-201514805724-A
Country	US
Kind code	A1
Filing date	Jul 22, 2015
Priority date	Jul 23, 2014
Publication date	Jan 28, 2016
Grant date	—

Abstract

A shift-by-wire system, including a controller that includes a motor driver, and a microcomputer connected to the motor driver to control a motor that drives a control object. The control object has a park lock mechanism having a lock state and an unlock state. The lock state and the unlock state are switched according to an operation position of the control object. The controller is configured to estimate a tilt of a vehicle, detect whether the lock mechanism is in the lock state or in the unlock state, and adjust a target rotation speed of the motor according to the estimated tilt when the operation position of the control object is changed for switching the lock state to the unlock state.

First claim

What is claimed is:

1 . A controller, comprising:
a motor driver; and a microcomputer connected to the motor driver to control a motor that drives a control object that has a park lock mechanism having a lock state and an unlock state, the lock state and the unlock state switched according to an operation position of the control object, wherein the controller is configured to:
estimate a tilt of a vehicle;
detect whether the lock mechanism is in the lock state or in the unlock state; and
adjust a target rotation speed of the motor according to the estimated tilt when the operation position of the control object is changed for switching the lock state to the unlock state.

2 . The controller of claim 1 , wherein
the controller is configured to adjust a target rotation speed of the vehicle when in a sliding state to be smaller than a target rotation speed of the vehicle when in a level state.

3 . The controller of claim 1 , wherein
the motor comprises a switched-reluctance motor in which a power supply phase is switched according to a count value of an output signal from an encoder, the output signal therefrom in a pulse shape being in sync with a rotation of a rotor of the motor, and the controller variably adjusts a phase advance amount of the power supply phase relative to a rotation phase of the rotor according to the tilt of the vehicle.

4 . A shift-by-wire system comprising:
a controller, comprising:
a motor driver; and
a microcomputer connected to the motor driver to control a motor that drives a control object that has a park lock mechanism having a lock state and an unlock state, the lock state and the unlock state switched according to an operation position of the control object, wherein
the controller is configured to:
estimate a tilt of a vehicle;
detect whether the lock mechanism is in the lock state or in the unlock state; and
adjust a target rotation speed of the motor according to the estimated tilt when the operation position of the control object is changed for switching the lock state to the unlock state;

a shift position switcher switching a shift position of a control object based on a drive of the control object by using the motor; and a park lock mechanism taking a lock state when the shift position is in a park position and taking an unlock state when the shift position is in a position other than the park position.

Assignees

• Denso Corp

Inventors

• Yoshida Kazuhiro

Classifications

• F16H2061/326

  Actuators for range selection, i.e. actuators for controlling the range selector or the manual range valve in the transmission · CPC title

• F16H63/48 Primary

  Signals to a parking brake {or parking lock; Control of parking locks or brakes being part of the transmission} · CPC title

• F16H2061/223

  Electrical gear shift lock, e.g. locking of lever in park or neutral position by electric means if brake is not applied; Key interlock, i.e. locking the key if lever is not in park position · CPC title

• F16H61/22 Primary

  Locking {of the control input devices} (constructional features of locking or disabling mechanisms F16H63/34) · CPC title