JPH07250497A - Stepping motor controller - Google Patents

Abstract

PURPOSE:To properly detect whether the step number calculation result of a terminal processing means is abnormal or not by comparing the step number of a stepping motor transmitted from a stored step number transmission means with the step number of the stepping motor calculated by a current step number calculation means. CONSTITUTION:The current step number calculation means of a terminal processing means calculates a current step number based on the drive state of a stepping motor by a stepping motor drive means and the current step number transmission means transmits the step number of a central processing means via a signal line. Then, a stored step number transmission means transmits the step number stored at a storage means to the abnormality detection means of the terminal processing means. Then, the abnormality detection means compares the step number from the calculation means with the received step number and then determines that the step number calculation result is abnormal when both step numbers do not match.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a step motor control device for controlling a step motor, and more particularly to a step motor control capable of detecting whether or not the calculation result of the number of steps matches the actual number of steps. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, a central processing means such as a manager ECU for transmitting control information of a step motor is connected to the central processing means via a signal line, and is transmitted from the central processing means via a signal line. There is known a step motor control device including terminal processing means such as a step motor module that drives a step motor based on the control information. In this type of step motor control device, the central processing means sends control information such as the target number of steps to the terminal processing means, and the terminal processing means outputs a drive signal to the step motor according to the control information.

[0003]

However, in the apparatus of this type, the terminal processing means calculates the current number of steps of the step motor according to the drive signal output by itself.
For this reason, if the terminal processing means is reset or its power supply is cut off, the current step number of the step motor is lost or the step number is erroneously calculated. Then, the actual number of steps of the step motor cannot be brought close to the target number of steps, and there are cases where good control cannot be performed.

Therefore, it is an object of the present invention to provide a step motor control device capable of satisfactorily detecting whether or not an abnormality has occurred in the number of steps of a step motor calculated by a terminal processing means such as a step motor module. Was made as.

[0005]

The invention according to claim 1 made in order to achieve the above-mentioned object, as shown in FIG. 4, includes a control information transmitting means for transmitting the control information of the step motor. A terminal comprising a processing means and a step motor driving means connected to the central processing means via a signal line and driving the step motor based on control information transmitted from the control information transmitting means via the signal line. A stepping motor control device having a processing means, the present stepping number calculating means being provided in the terminal processing means and calculating the current stepping number of the stepping motor based on the driving state of the stepping motor by the stepping motor driving means. And the current step number of the step motor calculated by the current step number calculation means provided in the terminal processing means. Is transmitted to the central processing means via the signal line, and the current step number of the step motor transmitted from the current step number transmitting means provided in the central processing means is stored. A step number storage unit for storing the number of steps, and a storage step number transmission unit provided in the central processing unit for transmitting the step number of the step motor stored by the step number storage unit to the terminal processing unit through the signal line. , The number of steps of the step motor provided in the terminal processing means and transmitted from the storage step number transmitting means is compared with the step number of the step motor calculated by the current step number calculating means, and both step numbers are compared. Abnormality detection means for detecting an abnormality in the above step number calculation result when the values do not match. The motor control unit is set to the gist.

According to the second aspect of the invention, as illustrated in FIG. 5, when the abnormality detecting means detects an abnormality in the step number calculation result in the terminal processing means, the step motor is driven. The step motor control device according to claim 1 is characterized in that a drive prohibiting means for prohibiting the above is provided.

Further, the invention according to claim 3 is based on the step motor control device according to claim 1 or 2, characterized in that the step motor opens and closes an idle speed control valve of an internal combustion engine. There is.

[0008]

According to the present invention having the above-mentioned structure, the current step number calculating means calculates the current step number of the step motor based on the driving state of the step motor by the step motor driving means, and calculates the current step number. The number transmitting means transmits the number of steps to the central processing means via the signal line. Then, the step number storage means stores the transmitted step number, and the stored step number transmission means transmits the step number of the step motor stored in the step number storage means to the terminal processing means via the signal line. To do.

If no power failure or reset is performed, the step number of the step motor transmitted from the stored step number transmitting means to the terminal processing means and the step motor step calculated by the current step number calculating means are determined. It should agree with the number. However, if there is a power failure or reset in the terminal processing means between the present step number transmitting means transmitting the step number and receiving the step number from the stored step number transmitting means, the above two step numbers will be different. There is. Therefore, the abnormality detecting means compares the two step numbers and detects an abnormality in the step number calculation result when the two step numbers do not match. Therefore, whether or not there is an abnormality in the step number calculation result of the terminal processing means due to a power failure, a reset, or the like can be properly detected.

According to the second aspect of the invention, when the abnormality detecting means detects an abnormality in the step number calculation result,
The drive prohibiting means prohibits driving of the step motor. Therefore, the malfunction of the step motor can be reliably prevented. Further, in the invention according to claim 3, the step motor opens and closes the idle speed control valve (hereinafter referred to as ISCV) of the internal combustion engine. If the step motor that drives the ISCV malfunctions, the output of the internal combustion engine may suddenly change. In the present invention, since the invention according to claim 1 or 2 is applied to the step motor of the ISCV, it is possible to favorably prevent such sudden output change of the internal combustion engine.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram schematically showing the configuration of the step motor control device of the embodiment. The step motor control device of this embodiment is provided in an internal combustion engine for automobiles.
This is a device for controlling the step motor 1 for opening and closing the SCV.

As shown in the figure, the step motor controller of the present embodiment is provided with a step motor module 3 as a terminal processing means for driving the step motor 1, and control information such as a target step St to the step motor module 3. It is provided with a manager ECU 5 as a central processing means for transmitting via the signal line 4.

The step motor module 3 is a central processing unit (CP) that executes various arithmetic processing.
U) 31a, read only memory (ROM) 31b storing programs and the like, random access memory (RAM) 31c in which data etc. are written at any time, and C
A CPU of the arithmetic processing unit 31 is provided with an arithmetic processing unit 31 whose main part is a bus 31d that electrically connects the PU 31a, the ROM 31b, and the RAM 31c to enable data input / output.
31 a sends a drive signal to the step motor 1 via the step motor driver 33.

Further, the CPU 31a inputs / outputs various data described below to the signal line 4 via the communication IC 35 and the communication driver receiver 37. The communication IC 35 is a CPU
The data output by 31a is transformed into a predetermined format for communication.
The signal level of the data input / output from is amplified to the level for communication.

On the other hand, the manager ECU 5 also has a CPU 51.
a, a ROM 51b, a RAM 51c, and a bus 51d as main components, and a CPU 51a of the arithmetic processing unit 51 inputs / outputs various data to / from the signal line 4 via a communication IC 55 and a communication driver receiver 57. There is.
The CPU 51a is also supplied with detection signals from various sensors (not shown) for detecting the operating state of the internal combustion engine, such as a rotation speed sensor and a water temperature sensor.
a calculates the target step St of the step motor 1 based on these signals.

Next, step motor control processing executed by the manager ECU 5 and the CPUs 51a and 31a of the step motor module 3 will be described. FIG. 2 shows C
FIG. 3 is a flowchart showing a manager ECU side control process executed by the PU 51a, and FIG. 3 is a flowchart showing a step motor module side control process executed by the CPU 31a. As will be described later, in this step motor control process, the step motor module 3 transmits the current step S2 calculated based on the driving state of the step motor 1 to the manager ECU 5, and the manager E
The CU 5 is currently returning the value S1 stored in step S2 to the step motor module 3.

The CPU 51a starts the processing of FIG. 2 when step S2 is currently transmitted via the signal line 4. When the processing is started, first, in step 101, the CPU 31
The current step S2 transmitted from a through the signal line 4 is read. In the following step 103, the read current step S2 is substituted for the current step S1 as the stored value on the manager ECU 5 side, and the routine proceeds to step 105. In step 105, a known process of calculating the target step St of the step motor 1 is executed based on the detection signals of the various sensors described above. In the following step 107,
The calculated target step St and the above-mentioned current step S1
And are transmitted to the step motor module 3 via the signal line 4, and the processing is temporarily terminated.

On the other hand, the CP of the step motor module 3
When the target step St and the current step S1 are input via the signal line 4, the U 31a starts the processing of FIG. When the processing is started, first, the transmitted target step St and current step S1 are read. In the following step 203, it is determined whether or not a later-described current step S2 calculated in the previous process and the read current step S1 are equal. When S1 ≠ S2 (step 203: N
O) directly proceeds to step 205, and the current step S2 calculated in the previous processing is sent to the CPU 5 via the signal line 4.
1a. When S1 = S2 (step 2
03: YES) moves to steps 207-219,
The step motor 1 is driven as follows.

When the process proceeds to step 207, it is determined whether or not the current step S2 is smaller than the target step St. If an affirmative determination is made here, the process proceeds to steps 209 and 211 sequentially, a drive signal is output so as to rotate the step motor 1 forward by one step, the current step S2 is incremented by 1, and the process proceeds to step 205 described above. Also, S2
When ≧ St (step 207: NO), step 21
Then, it is judged whether S2> St or not. If an affirmative decision is made here, the routine proceeds to steps 215 and 217 in order, a drive signal is output so as to reverse the step motor 1 by one step, the current step S2 is decremented by 1, and the routine proceeds to the aforementioned step 205. Furthermore, if a negative decision is made in step 213 as well, that is, if S2 = St, a drive signal is output in step 219 so as to maintain the rotational position of the step motor 1, and the routine proceeds to step 205. That is, at this time, step S2 does not change at this time.

In this way, the CPU 31a outputs a drive signal to the step motor 1 so that the current step S2 coincides with the target step St (steps 209, 21).
5, 219), the step S2 is currently corrected in parallel with the output of the drive signal (steps 211, 217). In addition, this series of step motor drive processing (step 20
7-219), the current step S2 is manager E
The current step S1 (stored value on the manager ECU 5 side of the current step S2) sent to the CU5 together with the target step St at the next processing is the same as the value stored as the current step S2 at the previous processing. It is determined whether or not (step 203). Then, when S1 = S2, it is determined to be normal, and the processes of steps 207 to 219 are executed. On the other hand, when S1 ≠ S2, there is a possibility that the current value of step S2 is abnormal due to a power failure, a reset, etc., and therefore steps 207 to 219 are not executed.

Therefore, the step motor control device of this embodiment can favorably detect whether or not an abnormality has occurred at step S2 at present, and further, when an abnormality occurs, the driving of the step motor 1 is stopped. As a result, malfunction can be prevented. Further, in the above-mentioned embodiment, since the malfunction of the ISCV step motor 1 of the internal combustion engine for automobiles can be prevented, the sudden change of the output of the internal combustion engine can be prevented well, and the runaway of the automobile can be prevented very well. You can The current step S2 value is set to a predetermined initial value together with the rotation angle of the step motor 1 when the internal combustion engine is once stopped and restarted.
Can be used to control.

In the processing of FIGS. 2 and 3, step 103 is stored in the step number storage means, and step 10
7 is the storage step number transmission means and control information transmission means, step 203 is the abnormality detection means and drive prohibition means, steps 209, 215 and 219 are step motor drive means, and steps 211 and 217 are current step number calculation means. In addition, step 205 is processing corresponding to the current step number transmitting means.

Further, in the above embodiment, when S1 ≠ S2,
Although the driving of the step motor 1 is simply stopped, the abnormality lamp may be turned on at this time to notify the driver of the abnormality. Then, the driver can deal with it by stopping the idling when the abnormal lamp is lit. Further, the step motor 1 may be continuously driven by simply turning on the abnormal lamp. In this case as well, the driver can deal with the abnormality. Further, when S1 ≠ S2, the step motor 1 may be driven (the ISCV is fully opened or fully closed) until it is mechanically stopped, and the current step S2 may be newly calculated based on the position. In this case, the accurate present step S2 can be automatically calculated and the control of the step motor 1 can be continued.

Further, in the above embodiment, the CPU 51a transmits the target step number St as the control information, but the control information also includes various control information such as the step number increase / decrease amount and the step number increase / decrease speed. It can also be configured to transmit and control the step motor 1. Also,
It is also possible to detect the abnormality of the step motor 1 by transmitting the information such as the increment / decrement amount of the step number and the increment / decrement speed of the step number from the CPU 31a to the CPU 51a. However, in this case, it is necessary for the CPU 51a to calculate the current step S2 based on the transmitted information.

[0025]

As described above in detail, in the invention according to claim 1, the step number of the step motor transmitted from the storage step number transmitting means and the step number of the step motor calculated by the current step number calculating means By comparing the above, it is possible to favorably detect whether or not there is an abnormality in the step number calculation result of the terminal processing means due to a power failure, a reset, or the like. Therefore, by applying this detection result to various controls or notifying the user, it is possible to favorably prevent malfunction of the device driven by the step motor.

Further, according to the second aspect of the invention, when the abnormality of the step number calculation result is detected, the driving of the step motor is prohibited, so that the malfunction of the step motor can be more reliably prevented. Further, according to the third aspect of the present invention, the malfunction of the step motor can be prevented, and the sudden output change of the internal combustion engine can be favorably prevented.

[Brief description of drawings]

FIG. 1 is a block diagram schematically showing a configuration of a step motor control device of an embodiment.

FIG. 2 is a flowchart showing a manager ECU side control process of the embodiment.

FIG. 3 is a flowchart showing a step motor module side control process of the embodiment.

FIG. 4 is an exemplary configuration diagram of the invention according to claim 1;

FIG. 5 is an exemplary diagram showing the configuration of the invention according to claim 2;

[Explanation of symbols]

1 ... Step motor 3 ... Step motor module 4 ... Signal line 5 ... Manager ECU 31,51
... Arithmetic processing unit

Claims (3)

[Claims] 1. A central processing means having control information transmitting means for transmitting control information of a step motor, and a central processing means connected to the central processing means via a signal line, and the control information transmitting means via the signal line. In a step motor control device having terminal processing means having step motor driving means for driving the step motor based on the transmitted control information, a step motor control device provided in the terminal processing means, The current step number calculation means for calculating the current step number of the step motor based on the driving state, and the current step number of the step motor calculated by the current step number calculation means provided in the terminal processing means, A current step number transmitting means for transmitting to the central processing means via the signal line; And a step number storage means for storing the current step number of the step motor transmitted from the current step number transmission means, and the step motor stored in the central processing means and stored by the step number storage means. The step number of the step motor transmitted to the terminal processing means via the signal line, and the step number of the step motor provided in the terminal processing means and transmitted from the storage step number transmitting means. An abnormality detection unit that compares the number of steps of the step motor calculated by the current step number calculation unit and detects an abnormality in the step number calculation result when the two step numbers do not match, Stepping motor controller. 2. The terminal processing means further comprises: when the abnormality detecting means detects an abnormality in the step number calculation result,
2. The step motor control device according to claim 1, further comprising drive prohibiting means for prohibiting driving of the step motor. 3. The step motor control device according to claim 1, wherein the step motor opens and closes an idle speed control valve of an internal combustion engine.