JP4120538B2 - Motor lock control device for vehicle - Google Patents

Description

  The present invention relates to a vehicle motor lock control device that is mounted on a vehicle and that can prevent a DC motor device from failing due to continuous overcurrent flowing through the DC motor device.

  Usually, a vehicle includes a DC motor device for operating a wiper, a mirror, a sliding door, and other vehicle-mounted electric devices (loads), and a storage battery (secondary battery device, which stores electricity consumed by the DC motor device). Also referred to as a battery device, which is a type of DC power supply device). When the DC motor device is locked, a lock current (overcurrent) flows through a power supply line (conduction line) that electrically connects the DC motor device and the DC power supply device.

  For this reason, it has been conventionally performed to provide a vehicle motor lock control device (hereinafter referred to as a “motor lock control device” as appropriate for convenience) between the DC power supply device and the DC motor device.

  FIG. 9 shows a current control process S900 performed by a conventional motor lock control device. As shown in FIG. 9, in the prior art, when a lock current flows for a predetermined time or more for a predetermined time or longer, a PTC (Positive Temperature Coefficient) or other DC motor device protection function works to cut off the circuit.

  However, according to such a prior art motor lock control device, the lock current, which is an overcurrent, flows for a predetermined time or more, so the fuse is blown, or the wiper device, the power window device and other on-vehicle electric devices are installed. There was a problem that the DC motor device to be driven failed.

  Further, since the lock current flows, if the motor protection function is activated, there is a problem that the power supply (energization) recovery work is complicated. For example, the vehicle had to be transported to a repair shop (including vehicle dealers and gas stations).

  Furthermore, it is necessary to select a fuse with a large standard according to the magnitude of the lock current or to increase the thickness of the power supply line (because a standard fuse corresponding to the magnitude of the steady current is selected. The fuse is blown every time the lock current flows.) This has the problem of hindering effective utilization of resources and reduction of raw material costs.

  Therefore, the present invention has been devised, and the present invention can prevent a failure of a DC motor device that drives a vehicle-mounted electric device without separately providing a motor protection circuit, and can also save resources. An object of the present invention is to provide a vehicle motor lock control device that can promote effective utilization and reduction of raw material costs.

(Claim 1)
In order to achieve the above object, a vehicle motor lock control device according to claim 1 is provided with a current control means provided in the middle of a power supply line for supplying power to a DC motor device mounted on the vehicle. Motor lock control device for
The current control means includes
Current detecting means for detecting a current value flowing through the feeder line;
PWM control means for PWM-controlling a current flowing to the DC motor device via the feeder line when a detection value of the current detection means is larger than a first predetermined current threshold value;
When the control execution time of the PWM control unit exceeds a first predetermined time, or when the detection value of the current detection unit is larger than a second predetermined current threshold, continuous power supply via the power supply line is temporarily stopped. Temporary power supply stopping means;
Trial power supply means
Self-return means,
With continuous power supply stop means
With
The trial power supply means repeatedly executes trial power supply of the power supply line during stop control by the temporary power supply stop means, and the detected value of the current detection means during power supply by the trial power supply means is a first predetermined current threshold value or If the second predetermined current threshold is greater than the control by the trial power supply means,
The self-recovery means stops the control by the trial power supply means when the detection value of the current detection means is smaller than the first predetermined current threshold value or the second predetermined current threshold value, and performs continuous power supply via the power supply line. Recover,
The continuous power supply stopping means continuously stops power supply of the power supply line when the control execution time of the PWM control means, the temporary power supply stop means, or the trial power supply means exceeds a second predetermined time. To do.

The vehicle motor lock control device according to claim 2 is the vehicle motor lock control device according to claim 1 , wherein the current control means is disposed in series with the power supply line, and includes a semiconductor switching element and a current detection sensor. The intelligent power switch device is provided, and PWM control or trial power supply control is performed by switching on and off states of semiconductor switching elements constituting the intelligent power switch device. A current detection sensor configured to detect a current value flowing through the feeder line and perform feedback control based on the detected value.

(Claim 1)
According to the vehicle motor lock control device of the first aspect, when the detection value of the current detection means, that is, the current flowing through the power supply line is larger than the first predetermined current threshold by the PWM control means, via the power supply line. Since the current flowing through the DC motor device is PWM-controlled, the effective value of the current flowing through the power supply line can be reduced. As a result, the power supply line is blown or the DC motor device is broken. There is an effect that can be prevented. In addition, it is possible to use a standard fuse corresponding to the magnitude of the rated current of the DC motor device and the thickness of the power supply line, thereby effectively utilizing resources and reducing raw material costs. There is.

In addition, when the current control means causes the control execution time of the PWM control means to exceed the first predetermined time, the continuous power supply via the power supply line is temporarily stopped, so that the abnormal state continues. Has an effect that it is possible to prevent the motor device and the wiring from being damaged by temporarily stopping the power supply.

Furthermore, when the detection value of the current detection means is larger than the second predetermined current threshold by the temporary power supply stop means constituting the current control means, continuous power supply through the power supply line is temporarily stopped. Even when a large lock current flows, there is an effect that the feeder line and the DC motor device can be protected.

In addition, while the continuous power supply via the power supply line is stopped, the trial power supply unit repeatedly performs the trial power supply via the power supply line. When the detected value of the current detection means is larger than the predetermined threshold value, the operation of the trial power supply means, that is, the repetition of the trial power supply via the power supply line is continued, while the detected value of the current detection means is smaller than the predetermined threshold value. In such a case, since the operation of the trial power supply means is stopped and continuous power supply to the power supply line is performed, it is possible to prevent a failure of the DC motor device without providing a separate motor protection circuit. In addition, when the abnormal state is temporary, the power supply is automatically restored.

Further , according to the continuous power supply stopping means, when the control execution time of the PWM control means, the temporary power supply stop means or the trial power supply means exceeds the second predetermined time, the power supply to the DC motor device via the power supply line is performed. Therefore, if the abnormal state is not temporary, the power supply is stopped and the consumption of excess power can be prevented.

According to the vehicle motor lock control device according to claim 2, in addition to the effects of vehicle motor lock control device according to claim 1, the current control means semiconductor switching devices and are disposed in series in the feed line It is composed of an intelligent power switch device having a current detection sensor, and PWM control or trial power supply control is executed by switching the on / off state of the semiconductor switching element, so that durability against repeated on / off ( There is an effect that it is possible to ensure (aging resistance). Further, since the current value flowing through the power supply line is detected by the current detection sensor and the feedback control is performed based on the detected value, the PWM control and the trial power supply control can be accurately performed. There is also. Furthermore, since the current detection sensor and the semiconductor switching element are integrated, there is an effect that the assembling work can be simplified.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Of course, the following examples are merely preferred examples of the present invention, and the technical scope of the present invention is not limited to the following examples.

  FIG. 1 is a block diagram of a vehicle motor lock control device (hereinafter simply referred to as “motor lock control device”) 100 according to an embodiment of the present invention. As shown in FIG. 1, the motor lock control device 100 includes an intelligent power switch (hereinafter referred to as “IPS”) 110 and an electric control system (hereinafter referred to as “ECS”) 120. Has been. Here, as prior art documents regarding IPS, there are JP-A-2002-353404, JP-A-2000-312142, and the like.

  The IPS 110 is provided in a power supply line 530 that electrically connects the DC power supply device 510 and the DC motor device 520, and connects the current detection sensor 111 that detects a current flowing through the power supply line 530 and the power supply line 530 (ON). ) Or a semiconductor switching element 112 that is in a cut-off (off) state. As described above, since the current detection means and the switching means are integrated into one device, the mechanism can be simplified. Note that the DC power supply device 510 is normally configured by a battery, and the DC motor device 520 is connected to an air conditioner fan, wiper, power window, and other vehicle-mounted electric devices (not shown).

  The current detection sensor 111 is for detecting a current flowing through the power supply line 530, and the semiconductor switching element 112 is configured to appropriately execute an on operation and an off operation in order to control the current flowing through the power supply line 530. The power supply line 530 is to be connected or cut off. Thereby, the current flowing through the feeder line 530 can be controlled.

  The ECS 120 is for controlling the motor lock control device 100, and in particular, by controlling on / off of the semiconductor switching element 112 based on the output signal of the current detection sensor 111, the current flowing through the DC motor device 520 is controlled. The process to control (namely, current control process) is performed. The ECS 120 includes an LSI circuit and other arithmetic circuits, a RAM, a ROM and other storage circuits, an A / D conversion circuit, a D / A conversion circuit, and a driver circuit (not shown).

(First current control process)
Hereinafter, the current control process executed by the vehicle motor lock control device 100 configured as described above will be described in detail. FIG. 2 is a timing chart of the first current control process (PWM control) S100, which is an example of the current control process.

  As shown in FIG. 2, when the detected value of the current detection sensor 111 is larger than the first predetermined current threshold value (It (1)), the vehicle motor lock control device 100 has a lock current in the power supply line 530. When the current flows, the semiconductor switching element 112 is alternately switched between an on state and an off state (on / off), thereby disconnecting the power supply line 530 at appropriate intervals, and applying PWM control (pulse the current flowing through the power supply line 530). Control). Thereby, it is possible to prevent the lock current from continuously flowing through the feeder line 530. That is, the effective value of the lock current can be reduced, and consequently, the fusing of the power supply line 530 and the failure of the DC motor device 520 can be prevented.

  Further, by reducing the effective value of the lock current, the standard of the fuse 540 can be set to a value smaller than the lock current, that is, a value corresponding to the magnitude of the rated current (steady current) of the DC motor device 520. However, the thickness of the power supply line 530 can also be made thin, and further, it is not necessary to separately provide a DC motor protection device such as a PTC. These lead to effective use of resources and reduction of raw material costs.

  Here, when the execution time of the PWM control is executed longer than the second predetermined time, the abnormal state continues and the semiconductor switching element 112 is continuously (continuously) determined that the abnormality is serious. The power supply to the DC motor device 520 is stopped in the off state (see FIG. 2A). Thus, when the abnormal state is serious, the semiconductor switching element 112 is continuously turned off to cut off the power supply line 530, thereby preventing a serious failure of the DC motor device 520 and the power supply line 530, and extra. Therefore, it is possible to reduce power consumption and to prevent the repairer / inspector from getting an electric shock.

  FIG. 3 is a flowchart showing the first current control process S100. The flow of the first current control process S100 will be described with reference to FIG. 3. First, it is determined whether or not the detection value of the current detection sensor 111 is equal to or greater than a first predetermined current threshold (It (1)). (S101). When the detected value is smaller than It (1) (S101: No), since it is in a normal state, the continuous power supply process is executed (S800), and then the process proceeds to S101 and the current detection sensor 111 is again performed. The detected value is compared with It (1) (S101).

  On the other hand, in the process of S101, when the detection value of the current detection sensor 111 is equal to or greater than It (1) (S101: Yes), the semiconductor switching element 112 is turned on / off (on state or off state) by switching. The electric wire 530 is appropriately cut off and the PWM control is executed (S102). During the execution of the PWM control (S102), it is determined whether or not the detection value of the current detection sensor 111 has become smaller than It (1) (S103), and when it has become smaller (S103: Yes), the abnormal state is determined. Since it is temporary and has been restored to the normal state, the process proceeds to S800, the continuous power supply process (S800) is executed, and then the process proceeds to S101. That is, when the abnormal state is temporary and returns to the normal state, normal power supply control, that is, automatic return to the continuous power supply state is performed (see FIG. 2B).

  On the other hand, if the detection value of the current detection sensor 111 has not yet become smaller than It (1) in the process of S103 (S103: No), whether or not the execution time of the PWM control has passed the second predetermined time or more. Is determined (S104). If the execution time of the PWM control is less than the second predetermined time (S104: No), the process proceeds to S102 and the PWM control is continuously executed. On the other hand, when the execution time of the PWM control (S102) is equal to or longer than the second predetermined time (S103: Yes), the semiconductor switching element 112 is continuously (continuously) because the abnormal state may be serious. In this way, the power supply to the DC motor device 520 via the power supply line 530 is completely stopped by turning it off (S105). After the process of S105, the first current control process S100 is terminated.

(Second current control process)
Next, with reference to FIGS. 4 and 5, a current control process executed by the vehicle motor lock control device 100, which is different from the current control process described above, will be described. First, the second current control process S200 will be described. The same parts as those in the current control process are denoted by the same reference numerals and the description thereof is omitted, and only different parts will be described.

In the second current control process S200, when the detection value of the current detection sensor 111 is equal to or greater than the second predetermined current threshold (It (2)), that is, when a lock current (overcurrent) flows. The semiconductor switching element 112 is continuously turned off so that the power supply to the DC motor device 520 via the power supply line 530 is completely stopped. Thereby, it is possible to prevent the feed line 530 from being blown or the DC motor device 520 from being broken due to the lock current (overcurrent). Here, the value of It (2) may be the same as or different from the value of It (1), but is preferably equal to or greater than the value of It (1).

  FIG. 5 is a flowchart showing the second current control process S200. The flow of the second current control process will be described with reference to FIG. 5. First, it is determined whether or not the detection value of the current detection sensor 111 is equal to or greater than a second predetermined current threshold value (It (2)) (S201). ), When the detected value is smaller than It (2) (S201: No), since it is in a normal state, the continuous power supply process (S800) is executed. Thereafter, the process proceeds to S101, and the detection value of the current detection sensor 111 and It (2) are compared again (S101).

On the other hand, when the detection value of the current detection sensor 111 is equal to or greater than It (2) in the process of S201 (S201: Yes), the semiconductor switching element 112 is continuously turned off (S102), and then the second The current control process S200 is terminated.
(Third current control process)
Next, the third current control process S300 will be described with reference to FIGS. The same parts as those in the current control process are denoted by the same reference numerals and the description thereof is omitted, and only different parts will be described.

  FIG. 6 is a timing chart of the third current control process S300. As shown in FIG. 6, in the third current control process S300, when the detection value of the current detection sensor 111 is larger than the second predetermined current threshold (It (2)), the semiconductor switching element 112 is turned off. Then, the power feeding line 530 is temporarily cut off, and the continuous power feeding is stopped. Thereafter, the semiconductor switching element 112 is intermittently turned on (the power supply line 530 is temporarily connected (powered)), and power is supplied to the power supply line 530 on a trial basis (current is supplied). At this time, when the current flowing through the feeder line 530 is still larger than It (2), the semiconductor switching element 112 is turned off again, and trial feeding is performed again after a time. In place of the second predetermined current threshold It (2), a threshold of other values such as the first predetermined current threshold It (1) may be adopted.

  On the other hand, when the detection value of the current detection sensor 111 becomes smaller than It (2) during the trial power supply control, the semiconductor switching element 112 is continuously turned on and returned to the continuous power supply state. Yes (see FIG. 6A). As a result, when the abnormal state is temporary and returns to the normal state, it is possible to automatically return to the normal power supply control, that is, the continuous power supply state.

  Further, when the trial power supply control is executed for the second predetermined time or more, the abnormal state continues, so the semiconductor switching element 112 is turned off and the DC motor device 510 via the power supply line 530 is switched to. Is stopped (see FIG. 6B). Therefore, it is possible to prevent a serious failure of the DC motor device 520 and the power supply line 530, excessive power consumption, and electric shock of a repairer / inspector.

  FIG. 7 is a flowchart showing the third current control process S300. With reference to FIG. 7, the process flow of the third current control process S300 will be described. First, whether or not the detection value of the current detection sensor 111 is equal to or greater than the second predetermined current threshold (It (2)). Determination is made (S301). If it is smaller than It (2) (S301: No), it is in a normal state, so the continuous power supply process (S800) is executed. After execution of the continuous power supply process, the process proceeds to S301, and the detection value of the current detection sensor 111 and It (2) are compared again.

  On the other hand, in the process of S301, when the detection value of the current detection sensor 111 is equal to or greater than It (2) (S301: Yes), the semiconductor switching element 112 is turned off to temporarily stop power feeding (S302). Thereafter, the semiconductor switching element 112 is intermittently turned on to execute a trial power supply process (S303).

During the execution of the trial power supply control (S303), it is determined whether or not the detection value of the current detection sensor 111 is smaller than It (2) (S304), and when it is smaller (S304: Yes), since abnormal condition is was restored to the normal state be temporary, and advances the process to S800, and executes the continuous feed process (S800), then the process proceeds to S301. On the other hand, when the execution time of the trial power supply control is less than the second predetermined time (S305: No), the process is performed until the detection value of the current detection sensor becomes smaller than It ( 2 ) (S304: No). The process proceeds to S303 and trial power supply control is continued.

  On the other hand, when the execution time of the trial power supply control becomes equal to or longer than the second predetermined time (S305: Yes), the semiconductor switching element 112 is continuously (continuously) turned off because the abnormal state may be serious. The power supply to the DC motor device 520 via the power supply line 530 is completely stopped (S307). Thereafter, the third current control process is terminated.

(Fourth current control process)
Next, the fourth current control process S400 will be described with reference to FIG. The same parts as those in the current control process are denoted by the same reference numerals and the description thereof is omitted, and only different parts will be described.

As shown in FIG. 8, in the fourth current control process S400, when the value of the current detection sensor 111 is equal to or greater than the first predetermined current threshold (It (1)) (S401: Yes), the PWM control is performed. When the execution time of the control becomes equal to or longer than the first predetermined time (S404: Yes), the power supply is temporarily stopped (S405), and the trial power supply control is executed (S406). . When the execution time of the trial power supply control becomes equal to or longer than the second predetermined time (S408: Yes), the power supply is completely stopped (S409). Of course, when the value of the current detection sensor becomes smaller than It (1) during the control (S403, S407: Yes), the process automatically returns to the continuous power supply process S800.

  In this way, the fourth current control process S400 is a process that combines the first current control process S100 and the third current control process S200, and is safer and more cautious depending on the duration of the abnormal state. Control is to be executed. The first predetermined time and the second predetermined time may be the same time or different times.

  The present invention has been described based on the embodiments. However, it goes without saying that the above embodiments can be variously improved and modified without departing from the gist of the present invention. These modifications are also included.

  For example, in the above embodiment, the first current control process S100 and the second current control process S200 may be combined. In this case, it is desirable that the value of the second predetermined current threshold value (It (2)) is larger than the first predetermined current threshold value (It (1)). That is, if the detection value of the current detection sensor 111 is equal to or greater than It (1) and smaller than It (2), PWM control is executed. ). Of course, in each of the current control processes S100 to S400, the value of the second predetermined current threshold value (It (2)) and the first predetermined current threshold value (It (1)) may be the same value. The value may be different.

  In addition, as a precaution, in the above embodiment, each process is executed when the detection value of the current detection sensor 111 is equal to or greater than a predetermined threshold current value. Each process may be executed when the threshold current value is exceeded. That is, in the said Example, the above and less than are only used for convenience.

  The present invention includes the following inventions.

  In a vehicle motor lock control device including current control means disposed in the middle of a power supply line for supplying power to a DC motor device mounted on a vehicle, current detection means for detecting a current value flowing through the power supply line; When the detection value of the current detection means is larger than the first predetermined current threshold or the second predetermined current threshold, temporary power supply stop means for stopping continuous power supply through the power supply line, and power supply stop by the temporary power supply stop means Later, a trial power supply unit that executes a process of repeating trial power supply to the DC motor device via the power supply line, and a detection value of the current detection unit during power supply by the trial power supply unit is a predetermined third current. When the control value is larger than the threshold value, the control by the trial power supply unit is continued. On the other hand, when the detection value of the current detection unit is smaller than the predetermined third current threshold value, The vehicle motor lock control apparatus characterized by comprising a self-restoring means for restoring the continuous feeding by stopped and the feed line control (A).

  That is, the present invention includes a vehicle motor lock control device that executes only trial power supply control as the current control processing.

It is a block diagram of the motor lock control device for vehicles which is one example of the present invention. It is a timing chart of the 1st electric current control processing performed in the above-mentioned motor lock control device. It is a flowchart of this 1st electric current control processing. It is a timing chart of the 2nd current control processing performed in the above-mentioned motor lock control device. It is a flowchart of this 2nd electric current control processing. It is a timing chart of the 3rd current control processing performed in the above-mentioned motor lock control device. It is a flowchart of this 3rd current control processing. It is a flowchart of the 4th electric current control processing performed in the said motor lock control apparatus. It is a timing chart of the current control process of a prior art.

Explanation of symbols

100 Vehicle motor lock control device (motor lock control device)
110 Intelligent Power Switch (IPS)
111 Current detection sensor 112 Semiconductor switching element 120 Electric control system (ECS)
510 DC power supply (battery (lead-acid battery) device)
520 DC motor device 530 Feed line

Claims (2)

In a vehicle motor lock control device provided with current control means disposed in the middle of a power supply line for supplying power to a DC motor device mounted on a vehicle,
The current control means includes
Current detecting means for detecting a current value flowing through the feeder line;
PWM control means for PWM-controlling a current flowing to the DC motor device via the feeder line when a detection value of the current detection means is larger than a first predetermined current threshold value;
When the control execution time of the PWM control unit exceeds a first predetermined time, or when the detection value of the current detection unit is larger than a second predetermined current threshold, continuous power supply via the power supply line is temporarily stopped. Temporary power supply stopping means;
Trial power supply means
Self-return means,
With continuous power supply stop means
With
The trial power supply means repeatedly executes trial power supply of the power supply line during stop control by the temporary power supply stop means, and the detected value of the current detection means during power supply by the trial power supply means is a first predetermined current threshold value or If the second predetermined current threshold is greater than the control by the trial power supply means,
The self-recovery means stops the control by the trial power supply means when the detection value of the current detection means is smaller than the first predetermined current threshold value or the second predetermined current threshold value, and performs continuous power supply via the power supply line. Recover,
The continuous power supply stopping means continuously stops power supply of the power supply line when the control execution time of the PWM control means, the temporary power supply stop means, or the trial power supply means exceeds a second predetermined time. A motor lock control device for a vehicle. The current control means includes an intelligent power switch device that is arranged in series with the power supply line and includes a semiconductor switching element and a current detection sensor, and an on state and an off state of the semiconductor switching element constituting the intelligent power switch device While switching PWM, PWM control or trial power supply control is executed, while a current detection sensor constituting the intelligent power switch device detects a current value flowing through the power supply line and performs feedback control based on the detected value The motor lock control device for vehicles according to claim 1 .

Images