JP2006029074A - Opening/closing body control device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an opening/closing body control device for a vehicle which prevents occurrence of an excessive catching load when an obstacle is caught. <P>SOLUTION: The opening/closing body control device for the vehicle having a function of detecting a catch of the obstacle performs opening/closing of the opening/closing body by opening and closing the opening/closing body. The control device comprises a driving motor outputting the rotation power to open and close the opening/closing body, a pulse encoder outputting a pulse signal according to the rotation frequency of the driving motor, and a control means evaluating a speed of the opening/closing body based on a pulse width of the pulse signal output from the pulse encoder and controlling the speed to be a preset target speed. A lower limit of the speed of the opening/closing body is set according to a position of the opening/closing body. When the speed of the opening/closing body obtained from the pulse width is lower than the lower limit, the speed of the opening/closing body is limited to the lower limit. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an opening / closing body control device for a vehicle that controls an opening / closing body mounted on a vehicle, particularly an opening / closing body such as a sliding door.

  In a vehicle opening / closing body control device that automatically opens and closes by driving a sliding door mounted on a vehicle by a drive motor, a pulse encoder (rotation speed detecting means) for detecting the rotation speed of the drive motor is mounted, and the pulse There is known a method of detecting an obstacle pinched by a door body when a pulse width detected by an encoder is a predetermined value or more. In other words, if the door body gets in an obstacle, the moving speed of the door body decreases, so the pulse width of the signal detected by the pulse encoder increases, and when this exceeds a predetermined value, the jamming is detected. To do.

  When such a pinching detection method is applied to a device that controls the driving force of the drive motor at a constant cycle based on the deviation between the actual moving speed of the door body and the target door speed, When the speed is remarkably reduced or stopped, a pulse signal may not be generated within a predetermined control cycle time. In this case, the moving speed of the door body cannot be recognized. For this reason, the following problems occur.

  That is, FIG. 7 is a timing chart showing the pulse signal output from the pulse encoder. As shown in FIG. 7, in the control system with a period of 50 msec, at the time T2, it is within the control period between T1 and T2. Since the encoder pulse is input, feedback control based on the correct door speed calculated from the pulse width Pb of the encoder pulse becomes possible. However, when the pulse width of the encoder pulse becomes as large as indicated by Pc in the figure, the encoder pulse has not yet been input at the time T3 in the next cycle, and the pulse width Pc is determined. I can't. Accordingly, there arises a problem that control based on the pulse width cannot be performed between times T2 and T3.

  Here, in the case where the door body is immediately before being fully closed and the door speed is reduced due to resistance such as weather strip, control based on the information on the decrease in the door speed is performed in the time period from time T2 to T3. I can't. That is, when the door speed decreases due to the resistance of a weather strip or the like, it is necessary to detect the speed decrease and control to increase the driving force of the drive motor. Since this information cannot be obtained, the driving force of the motor cannot be increased. Therefore, the resistance of the weather strip may be overcome and the door body may not be fully closed.

  On the other hand, when the decrease in the door speed at the time T3 occurs due to the obstacle being caught, information on the decrease in the door speed is not obtained at the time T3. Without increasing, it is possible to prevent an increase in pinching weight.

  In other words, when the speed of the door body decreases near the fully closed state, it is desired to increase the driving force of the drive motor, and when the speed of the door body decreases near the fully closed state, Since there is a possibility that an obstacle is caught, it is desirable not to increase the driving force of the driving motor.

  As described above, in the conventional vehicle opening / closing body control device, when an encoder pulse cannot be obtained within a predetermined control cycle (for example, 50 msec), the door speed cannot be detected within this control cycle. Therefore, the problem that the door body could not be fully closed occurred.

  The present invention was made in order to solve such a conventional problem, and the purpose of the present invention is to ensure that the door body can be fully closed and when an obstacle is sandwiched, An object of the present invention is to provide a vehicular opening / closing body control device that performs control so as not to increase the pinching load.

  In order to achieve the above object, the present invention provides a vehicle opening / closing body control device having a function of opening / closing an opening / closing body to perform an opening / closing operation of the opening / closing body and to detect an obstacle being caught. Based on a drive motor that outputs rotational power for opening and closing the body, a pulse encoder that outputs a pulse signal corresponding to the rotational speed of the drive motor, and a pulse width of the pulse signal output from the pulse encoder, Control means for obtaining the speed of the opening / closing body and controlling the speed to be a preset target speed, and setting a lower limit value of the speed of the opening / closing body according to the position of the opening / closing body When the speed of the opening / closing body obtained from the pulse width falls below the lower limit value, the speed of the opening / closing body is limited to the lower limit value.

  In the first aspect of the invention, a lower limit value of the door speed is set according to the position of the door body, and when the door speed calculated based on the pulse width falls below the lower limit value, the door speed is set to the lower limit value. Limit to value. Therefore, an excessive increase in driving force can be prevented, and troubles such as an increase in pinching weight can be avoided.

  In the invention of claim 2, the upper limit value of the door speed is set immediately before the door is fully closed. Thereby, even when a signal having a short pulse width due to high-frequency noise or the like is obtained, this influence can be avoided and appropriate control can be performed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a vehicle opening / closing body control apparatus according to a first embodiment of the present invention. As shown in the figure, the vehicular opening / closing body control device 1 controls the sliding movement of the door body (opening / closing body) in the front-rear direction of the vehicle, and includes a control means 2, a door drive motor 3, And a pulse encoder 4 for detecting the rotation speed of the door drive motor 3. Furthermore, a drive circuit 5 that drives and controls the door drive motor 3, a motor current detection circuit 6 that detects a current flowing through the door drive motor 3, and a battery voltage detection circuit 7 are provided.

  The control means 2 includes a target speed generation unit 11 that generates a target rotation speed of the door drive motor 3, a door position calculation unit 12 that obtains the current position of the door body based on the pulse signal output from the pulse encoder 4, And a speed calculation unit 13 for obtaining a moving speed of the door body based on the pulse signal.

  Further, the control means 2 detects that the door body has pinched an obstacle based on the position data of the door body, the speed data of the door body, and the current value detected by the motor current detection circuit 6. Based on the determination unit 15, the feedback control circuit 16 that performs feedback control of the drive circuit 5 based on the output signal of the speed calculation unit 13 and the output signal of the target speed generation unit 11, and the battery voltage and the position data of the door body A feedback gain calculation unit 17 for obtaining a feedback gain.

  The control means 2 includes a switch operation determination unit 18 that detects an operation of the door operation switch 31 or the main switch 32 mounted on the vehicle, an output signal of the door position calculation unit 12, an output signal of the half latch switch 33, And a drive determination unit 19 that sets the drive / stop and drive direction of the door drive motor 3 based on the output signal of the pinch determination unit 15, and a drive direction determination unit 20 that outputs a drive direction command signal to the drive circuit 5. Are provided.

  Furthermore, it has the alerting | reporting part 34 which alert | reports this with a sound or light, when a door main body drives.

  The target speed generation unit 11 is set with a speed table as shown in FIG. That is, the horizontal axis of the characteristic diagram shown in the figure shows the pulse count value output from the pulse encoder 4, the left end is the position where the door body is fully opened (pulse count value corresponding to the fully open position), the right end Is the position where the door body is fully closed (pulse count value corresponding to the fully closed position). The vertical axis indicates the moving speed of the door body.

  The target speed of the door body is set as shown by the curve S1, and the drive of the door drive motor 3 is controlled according to this target speed. Further, as shown in the figure, the door position is divided into five regions a1 to a5 from the fully open position to the fully closed position. The curves S2 and S3 shown in FIG. 2 will be described later.

  Next, the operation of the present embodiment will be described with reference to the flowchart shown in FIG. This process is performed by an interrupt process of 50 msec. First, it is determined whether or not the position of the door body is within the area a4 or a5 shown in FIG. 2 (step ST1).

  If the door position is not within the areas a4 and a5 (NO in step ST1), the counter value (value used in the following processing) is set to “0” (step ST8). On the other hand, if the door position is within the region a4 or a5 (YES in step ST1), it is determined whether or not a valid encoder pulse is input within this control cycle, that is, within 50 msec (step ST2). . When a valid encoder pulse is input (YES in step ST2), the counter value is set to “0” (step ST8), and the door drive motor 3 is controlled based on the door speed calculated from the encoder pulse. Control.

  When a valid encoder pulse cannot be obtained within the control cycle (NO in step ST2), the counter value is incremented. That is, “1” is added.

  Next, it is determined whether or not the counter value is “3” or more (step ST4). If it is less than “3” (NO in step ST4), it is determined whether or not the counter value is “1”. (Step ST5).

  If the counter value is “1” (YES in step ST5), the pulse width is obtained by the following equation (1) (step ST6).

(Pulse width) = (Time when control output was last performed)
-(Time when the last valid pulse was entered) + 50 msec (1)
If the counter value is not “1” (NO in step ST5), the pulse width is obtained by the following equation (2) (step ST7).

(Pulse width) = (Previous pulse width) + (Sample time) (2)
Then, the speed of the door body is obtained based on the pulse width obtained by the expression (1) or (2), and the door drive motor 3 is controlled based on the speed. Note that the sample time in the equation (2) is a control cycle of 50 msec.

  Next, the above processing will be described with reference to the timing chart shown in FIG. This figure shows changes in the pulse signal output from the pulse encoder 4, and times T1, T2, T3, and T4 indicate control periods (50 msec intervals), respectively. In the figure, since an effective encoder pulse as indicated by reference symbol Pb is input between times T1 and T2, YES is determined in the process of step ST2 shown in FIG. That is, the door speed is calculated from the encoder pulse, and the rotation of the door drive motor 3 is controlled based on the calculation result.

  Further, since the pulse signal indicated by the symbol Pc is not completely input between the times T2 and T3, an effective encoder pulse cannot be obtained. Accordingly, the counter value shown in FIG. 3 is “1”, and the pulse width is obtained based on the above-described equation (1).

  In this case, since “the time when the control output was last performed” is time T2, and “the time when the last effective pulse is entered” is time Tr, the equation (1) becomes T2−Tr + 50 msec. The time pr shown in FIG.

  That is, since a valid encoder pulse cannot be obtained between times T2 and T3, a pseudo pulse width pr is set, and the door speed is calculated based on the pulse width pr. Then, the output of the door drive motor 3 is controlled so that the door speed reaches the target door speed (S1) shown in FIG.

  On the other hand, when the counter value is not “1” (that is, when the counter value is actually “2” in the case of NO in step ST5 in FIG. 3), the previous pulse width pr is obtained by the equation (2). Further, a sample time of 50 msec is added.

  Here, to summarize the above operation, the door body approaches the fully closed position (regions a4 and a5 shown in FIG. 2), and the door speed decreases due to, for example, resistance due to the door body contacting the weather strip. In this case, the encoder pulse cannot be obtained within 50 msec which is the control cycle, and the speed cannot be obtained. Therefore, in this case, it is clear that the pulse width is longer than 50 msec (if the pulse width is shorter than 50 msec, an encoder pulse can be obtained within the control period). The time obtained by adding (T2-Tr) is set as a pseudo pulse width.

  As a result, the control system can reliably detect that the door speed has decreased in the time period from T2 to T3, and controls the driving force of the door drive motor 3 to increase. As a result, even when the door speed decreases due to resistance of a weather strip or the like in the vicinity where the door body is fully closed, the door can be reliably fully closed.

  If the door body has not reached the vicinity (regions a4, a5) where the door body is fully closed, that is, if NO in step ST1, the above control is not performed and the detection is performed in the previous control cycle. The door speed is calculated using the determined pulse width. If it demonstrates with the timing chart shown in FIG. 4, at the time of the time T3, the door speed based on the pulse width pb which becomes the one before will be calculated. Therefore, there is no problem of increasing the sandwiching load when the door body sandwiches an obstacle.

  If a lower limit value is set for the door speed calculated based on the pulse width calculated by the above-described formulas (1) and (2) and the door speed is limited to this lower limit value, An excessive increase in driving force can be prevented.

  Next, a second embodiment of the present invention will be described. The apparatus configuration is the same as the block diagram shown in FIG.

  The operation of the vehicle opening / closing body control apparatus according to the second embodiment will be described below with reference to the flowchart shown in FIG. This process is performed by an interrupt process of 50 msec.

  First, it is determined whether or not the position of the door body is within the area a4 or a5 shown in FIG. 2 (step ST11). If the door position is not within the areas a4 and a5 (NO in step ST11), the counter value is set to “0” (step ST16). On the other hand, if the door position is in the region a4 or a5 (YES in step ST11), it is determined whether or not a valid encoder pulse is input within this control cycle, that is, within 50 msec (step ST12). . If a valid encoder pulse is input (YES in step ST12), the counter value is set to “0”, and the door drive motor 3 is controlled based on the door speed obtained from this encoder pulse.

  If a valid encoder pulse cannot be obtained within the control period (NO in step ST12), the counter value is incremented.

  Next, it is determined whether or not the counter value is “3” or more (step ST14). If it is less than “3” (NO in step ST14), the pulse width is expressed by the above-described equation (2), that is, Calculation is performed by the following formula (step ST15).

(Pulse width) = (Previous pulse width) + (Sample time) (2)
Then, the speed of the door body is obtained based on the pulse width obtained by the equation (2), and the door drive motor 3 is controlled based on the speed.

  That is, in this embodiment, when a valid encoder pulse cannot be obtained within the control cycle, the control cycle time (in this case, 50 msec) is added to the pulse width obtained in the previous process, A pseudo pulse width is obtained.

  Even in such a configuration, as in the first embodiment described above, when the door body is in the vicinity of the fully closed state, it can be surely fully closed, and the fully closed state. If it is not in the vicinity, it is possible to obtain an effect that an increase in the pinching load can be prevented.

  Next, a third embodiment of the present invention will be described. The apparatus configuration is the same as the block diagram shown in FIG. In the third embodiment, the upper limit value and the lower limit value of the door speed are set according to the position of the door body. That is, as shown by the curve S2 in the characteristic diagram of FIG. 2, the lower limit value B is set in the area a1 where the door body is close to the fully open position, and the lower limit value A larger than the lower limit value B is set in the area a2. In the areas a3 and a4, a lower limit value C smaller than the lower limit value B is set. In the area a5, the lower limit value of the door speed is not set. On the other hand, the upper limit value of the door speed is set in the areas a4 and a5 shown in the curve S3.

  The operation of the vehicle opening / closing body control apparatus according to the third embodiment will be described below with reference to the flowchart shown in FIG. This process is executed by a 50 msec interrupt process.

  First, the door speed is obtained based on the pulse signal obtained from the pulse encoder 3. Specifically, the door speed is obtained by the following equation (3) (step ST31).

(Door speed) = 1000 × 2.7 / (measurement pulse width) (3)
Here, in addition to what is actually measured, the measurement pulse width includes a pseudo pulse width obtained by the processing described in the first and second embodiments.

  Next, it is determined whether or not the door position is in the area a4 or a5 (step ST32). If it is in any of the areas a4 and a5 (YES in step ST32), the above equation (3) is used. It is determined whether the obtained door speed is equal to or lower than the upper limit value shown in FIG. 2 (step ST33).

  If it is larger than the upper limit (NO in step ST33), the door speed is set to the upper limit (step ST34). That is, in the areas a4 and a5, a restriction is imposed so that the door speed does not become larger than the upper limit value.

  Next, it is determined whether or not the door position is in the area a3 or a4 (step ST35). If it is in any of the areas a3 and a4 (YES in step ST35), the door position is obtained by the equation (3). It is determined whether the door speed is equal to or higher than the lower limit C (step ST36). If it is smaller than the lower limit C (NO in step ST36), the door speed is set to the lower limit C (step ST37). That is, in the areas a3 and a4, the door speed is limited so that it does not become lower than the lower limit value C.

  If the door position is within the area a2 (YES in step ST38), it is determined whether the door speed is equal to or higher than the lower limit value A (step ST39). (NO in ST39), the door speed is set to the lower limit value A (step ST40). That is, in the area a2, a limit is added so that the door speed does not become lower than the lower limit value A.

  Furthermore, when the door position is within the area a1 (YES in step ST41), it is determined whether the door speed is equal to or higher than the lower limit value B (step ST42). NO in ST42), the door speed is set to the lower limit value B (step ST43). That is, in the area a1, the door speed is limited so that it does not become lower than the lower limit value B.

  Thus, in the present embodiment, when the door body reaches the fully closed position, even if the door speed is high, the door speed is limited to a predetermined upper limit value. Even when a short pulse signal (high-speed pulse signal) is obtained, the duty cycle output to the door drive motor 3 can be prevented from being lowered, and the door main body can be reliably closed.

  In addition, by setting the lower limit value of the door speed according to the door position, it is possible to prevent the door speed from becoming unnecessarily small, and when an obstacle is caught, it is caught more than necessary. An increase in load can be avoided.

  As mentioned above, although the opening / closing body control apparatus for vehicles of this invention was demonstrated based on embodiment of illustration, this invention is not limited to this, The structure of each part is the thing of arbitrary structures which have the same function Can be replaced. For example, in the above-described embodiment, the control cycle is 50 msec as an example, but the present invention is not limited to this.

  In addition, a sliding door has been exemplified as an example of an opening / closing body mounted on a vehicle, but the present invention is not limited to this, and is applied to an opening / closing body configured to be positioned by a pulse encoder output. Can do.

  This is extremely useful for ensuring that the door body of the sliding door is fully closed.

It is a block diagram which shows the structure of the vehicle opening-closing body control apparatus which concerns on one Embodiment of this invention. It is a characteristic view which shows the relationship between the position of a door main body and a target door speed, and the upper limit value and lower limit value of a door speed. It is a flowchart which shows operation | movement of the vehicle opening / closing body control apparatus which concerns on the 1st Embodiment of this invention. It is a timing chart which shows the pulse signal output from a pulse encoder. It is a flowchart which shows operation | movement of the vehicle opening / closing body control apparatus which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the vehicle opening / closing body control apparatus which concerns on the 3rd Embodiment of this invention. It is a timing chart which shows the pulse signal output from a pulse encoder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle opening-and-closing body control apparatus 2 Control means 3 Door drive motor 4 Pulse encoder 5 Drive circuit 6 Motor current detection circuit 7 Battery voltage detection circuit 11 Target speed generation part 12 Door position calculation part 13 Speed calculation part 15 Clamping judgment part 16 Feedback Control circuit 17 Feedback gain calculation unit 18 Switch operation determination unit 19 Drive determination unit 20 Drive direction determination unit 31 Door operation switch 32 Main switch 33 Half latch switch 34 Notification unit

Claims (2)

In the vehicle opening and closing body control device having a function of opening and closing the opening and closing body to perform the opening and closing operation of the opening and closing body and detecting the sandwiching of the obstacle,
A drive motor that outputs rotational power for opening and closing the opening and closing body;
A pulse encoder that outputs a pulse signal according to the rotational speed of the drive motor;
Based on the pulse width of the pulse signal output from the pulse encoder, it has a control means for obtaining the speed of the opening and closing body and controlling the speed to be a preset target speed,
In accordance with the position of the opening / closing body, a lower limit value of the speed of the opening / closing body is set. An opening / closing body control device for a vehicle characterized by limiting to a value. When the opening / closing body reaches a predetermined range near the fully closed position, an upper limit value of the opening / closing body speed is set, and the speed of the opening / closing body calculated based on the pulse width exceeds the upper limit value. In this case, the vehicle opening / closing body control device according to claim 1, wherein the speed of the opening / closing body is limited to the upper limit value.

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