Controller and shift-by-wire system using the controller

• US 9,683,661 B2
• Filed: 07/22/2015
• Issued: 06/20/2017
• Est. Priority Date: 07/23/2014
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Yoshida, Kazuhiro
• Primary Examiner(s): OH, HARRY Y
• Application Number:
  US14/805,724
• Publication Number:
  US 20160025214A1
• Time in Patent Office: 699 Days
• Field of Search: 701 45
• CPC Class Codes: F16H 2061/326 Actuators for range selection, i.e. actuators for controlling the range selector or the manual range valve in the transmission
• CPC Class Codes: F16H 63/48 Signals to a parking brake or parking lock; Control of parking locks or brakes being part of the transmission

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.

Claims

1. A controller, comprising:

a motor driver; and

a microcomputer connected to the motor driver to control a motor that drives a controlled object that has a park lock mechanism having a lock state and an unlock state,

wherein the lock state and the unlock state are switched according to an operation position of the controlled object, wherein

the controller is configured to;

determine 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 an estimated tilt of a vehicle when the operation position of the controlled object is changed for switching the lock state to the unlock state, wherein

the controller is configured to adjust a target rotation speed of the motor when the vehicle is in a sliding state to be smaller than a target rotation speed of the motor when the vehicle is in a level state.

2. 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 pulse from an encoder, the output signal pulse corresponding to 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.

3. 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 controlled object that has a park lock mechanism having a lock state and an unlock state,

wherein the lock state and the unlock state are switched according to an operation position of the controlled object, wherein

the controller is configured to;

determine 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 an estimated tilt of a vehicle when the operation position of the controlled object is changed for switching the lock state to the unlock state;

a shift position switcher switching a shift position of a controlled object based on a drive of the controlled object by using the motor; and

a park lock mechanism taking a lock state when the shift position is in a park position and an unlock state when the shift position is in a position other than the park position, wherein

the controller is configured to adjust a target rotation speed of the motor when the vehicle is in a sliding state to be smaller than a target rotation speed of the motor when the vehicle is in a level state.