SHIFT RANGE SWITCHING APPARATUS

• US 20150222211A1
• Filed: 06/16/2014
• Published: 08/06/2015
• Est. Priority Date: 02/04/2014
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: ONO, Takahiko, MARUO, Toshiaki, HASHIMOTO, Takeshi
• Granted Patent: US 9,209,729 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02P 23/0027 using different modes of control depending on a parameter, e.g. the speed
• CPC Class Codes: H02P 6/24 Arrangements for stopping

Abstract

An actuator control unit has a first pattern in which the energization phase is switched on every switching of pulse signals, and a second pattern in which, even when a switching timing of the energization phase due to the switching of the pulse signals exists, the energization phase is not switched during a predetermined period, and, in an acceleration period before a specific position in which the actual rotation angle position of the detent plate is going toward the target rotation angle position and then the rotation becomes stable, the energization phase is switched with the first pattern set, then, in a deceleration period after the specific position in which the rotation of the motor is stable and then the actual rotation angle position generally matches the target rotation angle position, the energization phase of the motor is switched with the second pattern set.

Claims

1. A shift range switching apparatus comprising:

an actuator for providing rotation output of a three-phase motor;

a detent plate that is rotated by the rotation output of the actuator;

a detent spring for holding the rotational position of the detent plate by engaging with one of a plurality of engagement parts provided in the detent plate;

a shift range switching mechanism for switching the actual shift range of an automatic transmission according to the actual rotation angle position that is a rotational position of the detent plate held by the engagement of the detent spring with the engagement part;

a detent position sensor for detecting the actual rotation angle position of the detent plate;

an actual shift range determination unit for determining the actual shift range of the automatic transmission based on the actual rotation angle position detected by the detent position sensor;

a shift range setting unit for outputting the requested shift range depending on the operation by a driver;

a target rotation angle position calculation unit for calculating the target rotation angle position of the detent plate depending on the requested shift range output from the shift range setting unit; and

an actuator control unit for driving the actuator so that the actual rotation angle position of the detent plate generally matches the target rotation angle position when the actual shift range determined by the actual shift range determination unit does not match the requested shift range,

wherein the shift range switching apparatus comprises a motor rotational position sensor for outputting a pulse signal in synchronization with the rotational position of the three-phase motor,

wherein the actuator control unit controls switching of an energization phase of the three-phase motor based on pulse signals of the motor rotational position sensor, and also has, as a switching control pattern of the energization phase, a first control pattern in which the energization phase is switched on every switching of the pulse signals of the motor rotational position sensor, and a second control pattern in which, even when a switching timing of the energization phase due to the switching of the pulse signals of the motor rotational position sensor exists, the energization phase is not switched at least during a predetermined period longer than the switching period of the pulse signals of the motor rotational position sensor, and

wherein in an acceleration period before a specific position in which the actual rotation angle position (Rang) of the detent plate is going toward the target rotation angle position and then the rotation of the three-phase motor becomes stable, the energization phase is switched with the first control pattern set, then, in a deceleration period after the specific position in which the rotation of the three-phase motor is stable and then the actual rotation angle position generally matches the target rotation angle position, the energization phase is switched with the second control pattern set.

2. The shift range switching apparatus according to claim 1, wherein, in the second control pattern, the predetermined period is set by calculating a period capable of obtaining a maximum deceleration effect based on the switching period of the motor rotational position sensor.

3. The shift range switching apparatus according to claim 1, wherein, in the second control pattern, the predetermined period is changed depending on the deviation of the actual rotation angle position from the target rotation angle position.

4. The shift range switching apparatus according to claim 1, wherein, a third control pattern of 180 degrees energization drive is provided, and the second control pattern is switched to the third control pattern depending on the deviation of the actual rotation angle position from the target rotation angle position.

5. The shift range switching apparatus according to claim 1, wherein, with a certain combination of the actual shift range and the requested shift range, the switching of the energization phase with the first control pattern set is not performed, but the switching of the energization phase with the second control pattern set is performed first.