CN-115315896-B - Motor control device

CN115315896BCN 115315896 BCN115315896 BCN 115315896BCN-115315896-B

Abstract

A motor control device (40) controls the driving of a motor (10) having a motor winding (11), and is provided with a driving control unit (51) and a parameter setting unit (55). A drive control unit (51) controls the driving of the motor (10). A parameter setting unit (55) sets control parameters for driving control of the motor (10) so that at least one of the motor torque and the motor speed can be changed according to the system temperature.

Inventors

KAWABATA HIROSHI

Assignees

株式会社电装

Dates

Publication Date: 20260508
Application Date: 20210318
Priority Date: 20200401

Claims (8)

1. A motor control device for controlling the driving of a motor having a motor winding, comprising: a drive control unit for controlling the drive of the motor, and A parameter setting unit that sets a control parameter for controlling driving of the motor so that at least one of a motor torque and a motor speed can be changed, based on a system temperature; When the motor is controlled to maintain the rotation speed by repeating the acceleration control and the deceleration control, When it is determined that the system temperature is normal, the parameter setting unit does not suppress the braking torque at the time of the deceleration request as a predetermined normal temperature parameter, When it is determined that the system temperature is low, the parameter setting unit sets the control parameter so that the braking torque at the time of the deceleration request is smaller than that at the time of normal temperature.
2. The motor control device according to claim 1, wherein, The control parameter is the target current and, When it is determined that the temperature is low, the parameter setting unit makes the target current at the time of the deceleration request smaller than that at the time of the normal temperature.
3. The motor control device according to claim 1, wherein, The control parameter is the amount of hysteresis, When it is determined that the temperature is low, the parameter setting unit makes the hysteresis angle amount at the time of the deceleration request smaller than that at the time of normal temperature.
4. The motor control device according to claim 1, wherein, When it is determined that the system temperature is low, the parameter setting unit sets the control parameter so that the driving torque at the time of the acceleration request is larger than that at the time of normal temperature.
5. The motor control device according to claim 4, wherein, The control parameter is the target current and, When it is determined that the temperature is low, the parameter setting unit makes the target current at the time of the acceleration request larger than that at the time of the normal temperature.
6. The motor control device according to claim 4, wherein, The control parameter is the advance angle quantity, When it is determined that the temperature is low, the parameter setting unit makes the advance angle amount at the time of the acceleration request larger than that at the time of normal temperature.
7. The motor control device according to claim 1, wherein, The control parameter is a target speed of the motor, When it is determined that the system temperature is low, the parameter setting unit makes the target speed greater than that at normal temperature.
8. The motor control device according to any one of claims 1 to 7, wherein, The motor control device is applied to a power transmission switching system, The parameter setting unit sets the control parameter according to the system temperature when the motor is driven by setting the number of energized phases to be constant and switching the energized phases in a learning process for learning a driving limit position of the motor without using information of a position of an output shaft to which rotation of the motor is transmitted.

Description

Motor control device Cross Reference to Related Applications The present application is based on Japanese patent application No. 2020-066013 filed on 1 month 4 in 2020, the contents of which are incorporated herein by reference. Technical Field The present disclosure relates to a motor control device. Background Conventionally, a shift stage switching device has been known that switches a shift stage by controlling the driving of a motor. For example, in patent document 1, as a current-carrying method in which the number of current-carrying phases is set to be constant at the time of performing the collision control, the current-carrying phases of the motor are sequentially switched by a single-phase current-carrying method or a two-phase current-carrying method to rotationally drive the motor. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2014-100041 Disclosure of Invention When the motor is driven by single-phase energization or two-phase energization, torque is more likely to be reduced near the angle at which the energized phase is switched than when energization is performed in such a manner that single-phase energization and two-phase energization are repeated. In the angular position where the torque decreases, if the motor is stopped due to the influence of the load torque, the torque is insufficient, and therefore, there is a possibility that the motor cannot be restarted. The purpose of the present disclosure is to provide a motor control device that can appropriately continue driving a motor. The motor control device controls driving of a motor having a motor winding, and includes a drive control unit and a parameter setting unit. The drive control unit controls the driving of the motor. The parameter setting unit sets a control parameter for controlling the driving of the motor so that at least one of the motor torque and the motor speed can be changed according to the system temperature. This can prevent the motor from stopping due to insufficient torque, and thus, the motor can be driven continuously appropriately. Drawings The above and other objects, features, and advantages of the present disclosure will become more apparent by the following detailed description with reference to the accompanying drawings. The drawing is as follows: fig. 1 is a perspective view showing a shift-by-wire system of a first embodiment; fig. 2 is a schematic configuration diagram showing a shift-by-wire system of the first embodiment; Fig. 3 is a circuit diagram showing a shift range control device according to the first embodiment; Fig. 4 is a block diagram showing an ECU of the first embodiment; fig. 5A is a diagram showing an energization pattern and an energization phase of the first embodiment; fig. 5B is a diagram showing a relationship between an electric angle and a motor torque in the first embodiment; Fig. 6 is a flowchart illustrating the motor driving process of the first embodiment; fig. 7 is a flowchart illustrating the low temperature determination processing of the first embodiment; fig. 8 is a flowchart for explaining the parameter setting process of the first embodiment; Fig. 9 is a timing chart for explaining the motor driving process of the first embodiment; fig. 10 is a flowchart illustrating a parameter setting process according to the second embodiment; fig. 11 is a timing chart for explaining the motor driving process of the second embodiment; Fig. 12 is a flowchart illustrating a parameter setting process according to the third embodiment; fig. 13 is a timing chart for explaining the motor driving process of the third embodiment; Fig. 14 is a timing chart for explaining the motor driving process of the reference example. Detailed Description The motor control device will be described below with reference to the drawings. In the following, in the embodiments, substantially the same structures are denoted by the same reference numerals, and description thereof is omitted. < First embodiment > Fig. 1 to 9 show a first embodiment. As shown in fig. 1 and 2, the shift-by-wire system 1 includes a motor 10, a shift position switching mechanism 20, a parking lock mechanism 30, a shift position control device 40 as a motor control device, and the like. The motor 10 is rotated by being supplied with electric power from a battery 90 mounted in a vehicle, not shown, and functions as a drive source of the shift range switching mechanism 20. The motor 10 is, for example, a switched reluctance motor. The motor 10 has motor windings 11 wound around salient poles of a stator, not shown. The motor winding 11 has a U-phase winding 111, a V-phase winding 112, and a W-phase winding 113 (see fig. 3). By controlling the energization to the motor winding 11, a rotor, not shown, is rotated. As shown in fig. 2, an encoder 13 as a rotational position sensor detects the rotational position of a rotor, not shown, of the motor 10. The encoder 13 is, for example, a ma