JPH07163168A - Control method for motor - Google Patents

Abstract

PURPOSE:To stop a motor at a predetermined rotational position regardless of the processing rate of a microcomputor by rotating the motor by an amount corresponding to a single pulse, stopping the motor every time when it is rotated, and deciding the stopping conditions and counting conditions of the motor during stoppage of the motor. CONSTITUTION:The motor controller comprises a user switch connected with a microcomputor through an input interface, a speed meter, a motor lock sensor, an ignition switch, a rotational angle sensor, and a reclining motor connected with the microcomputor through an output interface. The reclining motor is rotated by an amount corresponding to a single pulse and stopped every time when it is rotated. Since decision steps from 111 to 114 are executed during stoppage of the reclining motor, the reclining motor does not run over a predetermined rotational position during execution of the steps 111-114.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a motor control method.

[0002]

2. Description of the Related Art As a type of power reclining device for adjusting a tilt angle of a seat back in a vehicle seat by a reclining motor, the operation of the reclining motor is controlled by a microcomputer so that the seat back can be operated by a simple switch operation. There is known a device for adjusting the tilt angle to a preset inclination angle of a seated person.

An example of the method of controlling the reclining motor in this type of device will be described with reference to the flowchart shown in FIG.

First, in step 101, it is judged whether or not a seated person has operated a user switch to adjust the seat back to a desired predetermined inclination angle, and when the user switch is operated and is on, the routine proceeds to step 102. In order to prevent the seat back from operating while the vehicle is traveling, in step 102, it is determined whether or not the vehicle is stopped based on the output signal of the speedometer, and when the vehicle is stopped, the process proceeds to step 103. When the seat back is at the maximum tilt angle, the motor may be damaged if the energization is performed in the direction of increasing the tilt angle, or when the seat back is at the minimum tilt angle, the motor may be damaged if energized in the direction of further decreasing the tilt angle. Based on the signal from the motor lock sensor, it is determined whether or not an overcurrent is flowing through the motor. When no overcurrent is flowing through the motor, the process proceeds to step 104. At step 104, the ignition switch is turned on,
When the engine is in operation, it is determined whether or not the engine is in operation by turning it off.

At step 105, the count value C of pulses output one by one each time the motor rotates by a predetermined angle is compared with a set value S according to a predetermined predetermined tilt angle, and the count value C is compared.
Is smaller than the set value S, the routine proceeds to step 106, where the motor is driven in the direction in which the tilt angle of the seat back increases, and then the routine returns to step 101. On the other hand, step 1
If the user switch is not operated in 01, the vehicle is not stopped in step 102, step 10
When the overcurrent flows in step 3, the engine is stopped in step 104, or when the counting condition that the count value C is smaller than the set value S is not satisfied in step 105, the process proceeds to step 107, where the motor is turned on. Stop.

[0006]

In the conventional motor control method by the microcomputer described above,
Step 10 of determining whether the user switch is on or off
During the step 105 of comparing the count value C of 1 with the pulse and the set value S, the inclination angle of the seat back is determined such as whether the vehicle is stopped, no overcurrent is flowing, or the engine is running. Steps 102, 103, 1 for ensuring safety and discovering abnormal situations that are essential for changing
04 is interposed. Therefore, in step 105, the pulse count value C and the set value S are compared, and even if the pulse count value C is reduced by one pulse or a few pulses, the pulse count value C and the set value S are then compared in step 105. When
Prior to that, the reclining motor rotates during processing of steps 102 to 104, and as a result, the tilt angle of the seat back increases and exceeds the set value, and the seat back may become larger than the desired tilt angle. To avoid this, a microcomputer capable of high-speed processing is required, but the cost is high because it is expensive.

In view of the above problems, it is an object of the present invention to provide a motor control method capable of accurately stopping a motor at a predetermined rotation position regardless of the processing speed of a microcomputer.

[0008]

According to the present invention, when any one of a plurality of motor stop conditions is satisfied, or the count value of the pulse output each time the motor rotates a predetermined angle corresponds to the predetermined count condition. A method of controlling a motor to stop the motor when performing a plurality of motor stop condition determination steps for determining each of the motor stop conditions, and a count for determining the predetermined counting condition subsequent to the plurality of motor stop condition determination steps. A condition determining step, a calculation step for calculating a variable obtained by adding 1 to the pulse count value following the counting condition judging step, and a magnitude comparison for comparing the pulse count value and the variable value following the calculation step A determination step, and when any one of the motor conditions is satisfied in the motor stop condition determination step,
Alternatively, the motor control is terminated when the predetermined counting condition is satisfied in the counting condition determination step, and the motor is started if the counted value is smaller than the variable value in the magnitude comparison determination step, and then the process proceeds to the magnitude comparison determination step again. In other cases, it is characterized in that the process proceeds to the motor stop condition determination step after stopping the motor.

[0009]

According to the present invention, the motor is rotated by one pulse, the motor is stopped each time, and the motor stop condition and the counting condition are judged while the motor is stopped. Regardless of this, the motor can be accurately stopped at a predetermined rotation position.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the functional configuration of a power reclining device to which the present invention is applied. The device is a microcomputer 1 via an input interface.
It has a user switch 11 connected to 0, a speedometer 12, a motor lock sensor 13, an ignition switch 14, a rotation angle sensor 15, and a reclining motor 20 connected to the microcomputer 10 via an output interface.

The user switch 11 is a switch operated when the seated person adjusts the seat back to a desired inclination angle set in advance. The speedometer 12 is connected to detect the stop of the vehicle, and the ignition switch 14 is connected to detect whether or not the engine is operating. The motor lock sensor 13 detects the overcurrent that flows when the reclining motor 20 rotates until the seat back reaches the maximum or minimum tilt angle, and further continues energization, and is provided integrally with the reclining motor 20. . The rotation angle sensor 15 is for detecting the rotation angle of the reclining motor 20, and is connected to the output shaft of the motor 20 so that one pulse is output each time the reclining motor 20 rotates by a certain angle. Reclining motor 20
Operates according to a predetermined procedure based on the output signals of these switches, and the tilt angle of the seat back is adjusted accordingly. An example of this procedure will be described based on the flowchart shown in FIG.

First, in step 111, it is determined whether or not the occupant has operated the user switch 11 to adjust the seat back to a desired predetermined inclination angle, and when the user switch 11 is operated and is on, the process proceeds to step 112. . In order to prevent the seat back from operating while the vehicle is traveling, it is determined in step 112 based on the output signal of the speedometer 12 whether or not the vehicle is stopped, and when the vehicle is stopped, the routine proceeds to step 113. When the seat back is at the maximum inclination angle, the reclining motor 20 may be damaged if the energization is performed in the direction in which the inclination angle increases, or if the seat back is in the minimum inclination angle, the reclining motor 20 may be damaged. In step 113, it is determined based on the signal from the motor lock sensor 13 whether or not an overcurrent is flowing through the reclining motor 20, and when no overcurrent is flowing through the reclining motor 20, the process proceeds to step 114. In step 114, it is determined whether or not the engine is in operation by turning on / off the ignition switch 14, and when it is in operation, the process proceeds to step 115.

In step 115, the number of pulses output from the rotation angle sensor 15 is counted every time the reclining motor 20 rotates by a certain angle, and the count value C is compared with a preset value S set according to a desired tilt angle. When the count value C is smaller than the set value S, the routine proceeds to step 116.

When the user switch 11 is not operated in step 111, when the vehicle is not stopped in step 112, and when overcurrent flows in step 113,
When the engine is stopped in step 114, or when the count value C matches the set value S in step 115, and the seat back is adjusted to the inclination angle desired by the seated person, the control is ended.

At step 116, 1 is added to the pulse count value C.
The variable V added with is calculated and the process proceeds to step 117. In step 117, the magnitude of the count value C and the variable V are compared, and if the count value C is smaller than the variable V, the process proceeds to step 118, otherwise the process proceeds to step 119. In step 118, the reclining motor 20 is driven and step 11
Return to 7. On the other hand, in step 119, the reclining motor 20 is stopped and the process returns to step 111.

According to this control method, for example, the set value S
Is set to 100, when the count value C is 98 at a certain stage, the routine proceeds from step 115 to step 116, where 99 by adding 1 to 98 is calculated as the variable V, and then the routine proceeds to step 17, where The count value C and the variable V are compared. At this stage, since the count value C is 98 and the variable V is 99, the routine proceeds to step 118, the reclining motor 20 is driven, and the routine returns to step 117. Step 118
After returning from step 117 to step 117, the count value C is increased by one by driving the reclining motor 20 in step 118 to reach 98, so next, when the count value C is compared with the variable V, the count condition is met. Since it has disappeared, the process proceeds to step 119. Here, after stopping the reclining motor 20, the process returns to step 11.

As described above, according to this embodiment, the reclining motor 20 is rotated by one pulse and stopped each time, and during that time, the steps 111 to 11 are repeated.
Since the determination process of step 4 is executed, steps 111 to 11 are executed.
The reclining motor does not exceed the predetermined rotational position during the execution of the process of No. 4. Therefore, the reclining motor 20 accurately rotates by the angle defined by the set value S and stops regardless of the processing speed of the microcomputer.

[Brief description of drawings]

FIG. 1 is a block diagram showing a functional configuration of a power reclining device for a vehicle seat to which a motor control method according to the present invention is applied.

FIG. 2 is a flowchart showing a procedure of operating a reclining motor in the device.

FIG. 3 is a flowchart showing a conventional motor control method.

[Explanation of symbols]

10 ... Microcomputer, 11 ... User switch, 12 ... Speedometer, 13 ... Motor lock sensor, 14 ... Ignition switch, 15 ... Rotation angle sensor, 20 ... Reclining motor.

Claims (1)

[Claims] 1. A motor that stops a motor when any one of a plurality of motor stop conditions is satisfied, or when a count value of pulses output each time the motor rotates a predetermined angle corresponds to a predetermined count condition. A control method,
A plurality of motor stop condition determining steps for determining each of the motor stop conditions, a counting condition determining step for determining the predetermined counting conditions subsequent to the plurality of motor stop condition determining steps, and a counting condition determining step In the motor stop condition judging step, there is included a calculation step for calculating a variable obtained by adding 1 to the pulse count value, and a magnitude comparison / judgment step for comparing the pulse count value and the variable value. When any one of the conditions is met, or when a predetermined counting condition is met in the counting condition judging step, the motor control is terminated, and in the magnitude comparison judging step,
A motor control method characterized in that if the count value is smaller than a variable value, the motor is started and then the process proceeds to the magnitude comparison and determination step again; otherwise, the motor is stopped and then the motor stop condition determination step is performed.