JP2010076491A - Door opening and closing recognition apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent wrong recognition of door opening and closing when a contact part of a door courtesy switch gets wet by rain or the like. <P>SOLUTION: Focusing on the fact that changing speed of voltage of a contact signal of a door courtesy switch 3 from a closed state to an opened state of a door 2a when the door 2a is actually opened from the closed state is different from one when a contact part of the door courtesy switch 3 gets wet by rain or the like, a CPU 121 detects the changing speed of the voltage of the contact signal of the door courtesy switch 3 from the closed state to the opened state of the door 2a. Further, when the voltage changing speed detected with the contact part of the door courtesy switch 3 got wet by rain or the like is less than a predetermined value, the CPU 121 recognizes that the door 2a is closed even if the voltage of the contact signal is changed into a voltage indicating the opened state of the door 2a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a door open / close recognition device that recognizes the open / close state of a vehicle door from the voltage of a contact signal of a door courtesy switch, and more particularly to prevention of erroneous recognition when a contact of a door courtesy switch gets wet with rainwater or the like.

  Generally, the vehicle is provided with a door courtesy switch that is turned on and off by opening and closing the door. This door courtesy switch is a normally closed switch, and when the door is opened, the contact is closed, and when the door is closed, the contact is opened.

Since the voltage (DC voltage) of the contact signal of the door courtesy switch changes according to the opening and closing of the door courtesy switch when the door of the vehicle is opened and closed, it is called, for example, a “door lock & security system (door lock system)” In a vehicle equipped with a security system, the contact signal is monitored by a door lock controller while the security system is in operation (in a warning mode), and the door lock is released and the contact signal is detected from a voltage indicating the closed state of the door. An alarm is generated by sound or light when the voltage is changed to a voltage indicating the open state (see, for example, Patent Document 1).
JP 10-329649 A (for example, paragraphs [0011], [0015]-[0017], FIG. 1 and the like)

  The door courtesy switch is generally attached to a door opening of a vehicle and covered with a waterproof cover, but rainwater may enter the waterproof cover and get wet in the waterproof cover depending on rain conditions. When the contact portion gets wet, the voltage of the contact signal changes from the voltage indicating the closed state of the door to the voltage indicating the open state, even though the door is closed, and erroneous recognition of the open / closed state of the door occurs. There is a problem, and based on this misrecognition, for example, the security system erroneously generates an alarm. If the door courtesy switch mounting surface such as the body panel of the vehicle is not completely flat due to manufacturing even if it is covered with a waterproof cover, rainwater etc. May intrude.

  An object of the present invention is to prevent misrecognition of opening and closing of a door when a contact portion of a door courtesy switch gets wet by rainwater or the like.

  In order to achieve the above object, a door open / close recognition device according to the present invention is a door open / close recognition device that recognizes the open / close state of a door of a vehicle from the voltage of a contact signal of a door courtesy switch. A voltage change speed detecting means for detecting a speed changing from a voltage indicating a state to a voltage indicating a door open state, and when the detected voltage change speed is less than a predetermined value, the contact signal becomes a voltage indicating the door open state. Recognizing processing means for recognizing that the door is in a closed state even if it is changed is provided (claim 1).

  According to the door opening / closing recognition device of the present invention of claim 1, the voltage of the contact signal of the door courtesy switch is different between when the door is opened from the actually closed state and when the contact portion of the door courtesy switch is wet due to rain water immersion. It is noted that there is a difference in the speed at which the door voltage changes from the closed voltage to the open voltage.

  That is, when the door is opened from the closed state, the voltage of the contact signal of the door courtesy switch suddenly changes from the closed voltage to the open voltage at the moment when the door is opened. When the contact part of the door courtesy switch gets wet due to the above, the voltage of the contact signal of the door courtesy switch gradually changes from the closed voltage to the open voltage as the wet state progresses.

  Therefore, the voltage change speed detecting means detects the speed at which the voltage of the contact signal of the door courtesy switch changes from the voltage indicating the door closed state to the voltage indicating the door open state. Further, when the voltage change speed detected by the recognition processing means when the contact portion of the door courtesy switch is wetted by rain water or the like is less than a predetermined value, the contact processing signal is changed to a voltage indicating the open state of the door by the recognition processing means. Also recognizes that the door is closed.

  Accordingly, it is possible to recognize the opening / closing of the door by preventing erroneous recognition when the contact portion of the door courtesy switch gets wet by rain water or the like. Therefore, for example, a security system free from false alarms can be provided based on the recognition of opening and closing.

  Next, in order to describe the present invention in more detail, embodiments will be described in detail with reference to FIGS.

(One embodiment)
An embodiment of the present invention will be described with reference to FIGS.

  1 is a block diagram of a door opening / closing recognition device 1A, FIG. 2 is a perspective view of a vehicle 2 provided with the door opening / closing recognition device 1A of FIG. 1, FIG. 3 is a cross-sectional view of a mounting portion of a door courtesy switch 3 of the vehicle 2, FIG. 5 is a waveform diagram of a contact signal of the door courtesy switch 3.

  The door courtesy switch 3 of the door opening / closing recognition device 1A is attached to the door opening edge of the vehicle 2 so as to be pressed at the inner end of the door 2a, as indicated by a broken line in FIG. Specifically, as shown in FIG. 3, the door courtesy switch 3 includes a push button portion 3a that contacts the door 2a and a normally closed contact portion 3b, and the flange of the push button portion 3a is the door of the body panel 2b of the vehicle 2. The switch opening 2c formed at the edge of the opening is screwed, the push button portion 3a protrudes outward from the vehicle body panel 2b, the contact portion 3b is accommodated inside the vehicle body panel 2b, and the push button portion 3a is accommodated in the vehicle body panel 2b. Projecting outwards. Further, the door courtesy switch 3 is covered with a rubber cover 3c from the outside of the mounting opening 2c.

  Then, rainwater or the like enters the opening 2c through the gap between the door courtesy switch 3 and the body panel 2b as shown by the arrow line in FIG. 3, and the contact portion 3b gets wet.

  Next, the door opening / closing recognition apparatus 1A of this embodiment including the door courtesy switch 3 is equipped with the function of the security system of the “door lock & security system” and is formed as shown in FIG.

  In FIG. 1, 10 is a key cylinder switch, 11 is a door lock switch for the driver's seat, and the CPU 121 of the door lock controller 12 having a microcomputer configuration drives the door lock motor 13 in conjunction with the operation of these switches 10 and 11. While the security system is in operation, the door is closed and locked.

  Further, during operation of the security system, a predetermined voltage is applied to the door courtesy switch 3 from the voltage generator 122 of the door lock controller 12 via a resistor (not shown) based on the voltage data of the CPU 121. Further, a contact signal (analog voltage signal) of the door courtesy switch 3 based on application of a predetermined voltage is converted into contact voltage data by the A / D converter 123 of the door lock controller 12 and is taken into the CPU 121.

  Then, the voltage change rate detecting means formed by the CPU 121 monitors the voltage of the contact voltage data every moment, and the contact voltage data is a predetermined high voltage indicating the closed state of the door set near the lower side of the predetermined voltage. A timer (not shown) is started when it falls from the data of V (H). Further, the voltage change rate detection means detects that the voltage of the contact signal is based on the timer timing data when the contact voltage data drops to data of a predetermined low voltage V (L) indicating the open state of the door near the ground voltage. A speed that changes from a voltage indicating the door closed state to a voltage indicating the door open state (a time-varying voltage gradient over time) is detected.

  Further, during the operation of the security system, the recognition processing means formed by the CPU 121 by executing the door opening / closing recognition program opens and closes the door 2a depending on whether the voltage change speed detected by the voltage change speed detecting means is greater than or less than a predetermined value. Recognize the state. In other words, the predetermined value of the detected voltage change speed is based on an experiment or the like, for example, the speed (change speed) of the rapid voltage change pattern accompanying the opening and closing of the normal door 2a as shown by the solid line in FIG. The contact speed 3b of the door courtesy switch 3 is wetted by rain water or the like as shown by the solid line in FIG. 5 and is set to a threshold speed that is intermediate between the speed (change speed) of the voltage change pattern that changes slowly.

  Then, when the door 2a is actually opened and closed when the detected voltage change rate is equal to or higher than a predetermined value, the voltage of the contact signal changes from a voltage indicating the closed state of the door 2a to a voltage indicating the open state of the door 2a. Thus, it is recognized that the door 2a is changed to the open state. At this time, in order to notify that a suspicious person has entered the vehicle 2, the alarm control means of the CPU 121 energizes and drives the horn 14 as an alarm device to generate an alarm sound. On the other hand, when the contact portion 3b where the detected voltage change rate is less than a predetermined value gets wet, the voltage of the contact signal changes from a voltage indicating the closed state of the door 2a to a voltage indicating the open state of the door 2a. However, the door 2a is recognized as being maintained in the closed state, and the horn 14 is not energized.

  Therefore, it is possible to provide a security system free from false alarms based on recognition of opening / closing of the door 2a.

(Other embodiments)
Another embodiment of the present invention will be described with reference to FIGS.

  6 is a block diagram of a door opening / closing recognition device 1B mounted on the vehicle 1 in place of the door opening / closing recognition device 1A, and FIGS. 7 and 8 are waveform diagrams of contact signals of the door courtesy switch 3. FIG.

  The door opening / closing recognition device 1B of this embodiment is different from the door opening / closing recognition device 1A of the embodiment described above in that the voltage of the contact signal is changed from the voltage indicating the closed state of the door 2a by the voltage change speed detection means. This is the point of digitally detecting the speed at which the voltage indicating the state changes.

  That is, in the case of the door opening / closing recognition device 1A of the embodiment, the voltage change rate detection means monitors the analog change in the voltage of the contact signal and detects the door from the voltage V (H) indicating the closed state of the door 2a. Although the voltage change rate is detected in an analog manner by obtaining the voltage change gradient every moment during the change to the voltage V (L) indicating the open state of 2a, in this embodiment, as shown in FIG. The door lock controller 12 is provided with an input circuit 124 for detecting the closed state of the door 2a to which a contact signal is branched and inputted, and an input circuit 125 for detecting the open state of the door 2a. The timing at which the voltage Vα slightly lower than the voltage V (H) in the closed state 2a and the timing at which the voltage Vβ (<Vα) slightly higher than the voltage V (L) in the open state are detected digitally. Based on the time difference between the timing, the voltage of the contact signal to detect the speed of changing from the voltage indicating the closed state of the door 2a V (H) to the voltage V (L) indicating the open state of the door 2a digitally.

  Each of the input circuits 124 and 125 is formed by an analog circuit of a PNP transistor Q and resistors R1 to R3, and the input circuits 124 and 125 are set based on setting of resistance values of a base input resistor R1 and an emitter-base resistor R2. The threshold value for turning on the transistor Q is different. The threshold value of the input circuit 124 is set to the voltage Vα, and the threshold value of the input circuit 125 is set to the voltage Vβ.

  Then, when the door 2a is actually opened and closed, the voltage of the contact signal of the door courtesy switch 3 changes instantaneously as shown by the solid line in FIG. 7, decreases to the voltage Vα at time t1, and then reaches the voltage Vβ at time t2 immediately thereafter. descend. On the other hand, when the contact portion 3b of the door courtesy switch 3 gets wet, the voltage of the contact signal gradually changes as shown by the solid line in FIG. 8, and decreases to the voltage Vα at time t3 and then to the voltage Vβ at time t4. descend.

  The voltage change speed detection means of the ECU 121 is activated by the detection outputs (ON signals) of the input circuits 124 and 125 to obtain the time difference Δt21 (= t2−t1) (or time difference Δt43 (= t4−t3)), and the voltage difference Based on ΔV (= Vα−Vβ) and time difference Δt21 (or Δt43), the voltage of the contact signal changes from voltage V (H) indicating the closed state of the door 2a to voltage V (L) indicating the open state of the door 2a. Detect the changing speed. Further, the recognition processing means recognizes when the door 2a is actually opened and closed and when the contact portion 3b of the door courtesy switch 3 is wet based on the detection result of the voltage change speed detecting means.

  In the case of the present embodiment, while the security system in which the engine of the vehicle 2 is stopped, the ECU 121 and the like stop operating in the sleep mode until the detection output of the input circuit 124 is generated, and the input circuit 124 is detected. When an output is generated, the door opening / closing recognition device can shift to an operation mode using the same as a trigger and has the same effect as the one embodiment with less power consumption than the analog detection of the one embodiment. 1B can be provided.

  The present invention is not limited to both the above-described embodiments, and various modifications other than those described above can be made without departing from the spirit thereof, for example, the configuration of the door lock controller 12 and the like. May be anything. Of course, the shape, structure, installation location, and the like of the door cartridge 3 may be different from those of the both embodiments.

  The present invention can be applied to various vehicle door open / close recognition devices.

It is a block diagram of the door opening / closing recognition apparatus of one Embodiment of this invention. It is a perspective view of the vehicle provided with the door opening / closing recognition apparatus of FIG. It is sectional drawing of the attachment part of the door courtesy switch of the vehicle of FIG. It is a wave form diagram of the contact signal at the time of door opening and closing of the door courtesy switch of FIG. It is a wave form diagram of a contact signal when a contact part gets wet with rain water etc. of the door courtesy switch of FIG. It is a block diagram of the door opening / closing recognition apparatus of other embodiment of this invention. It is a wave form diagram of the contact signal at the time of the door opening and closing of the door courtesy switch of FIG. It is a wave form diagram of a contact signal when a contact part gets wet with rain water etc. of the door courtesy switch of FIG.

Explanation of symbols

1A, 1B Door open / close recognition device 2 Vehicle 2a Door 3 Door courtesy switch 12 Door lock controller

Claims (1)

In the door open / close recognition device for recognizing the open / closed state of the vehicle door from the voltage of the contact signal of the door courtesy switch,
A voltage change speed detecting means for detecting a speed at which the voltage of the contact signal changes from a voltage indicating a door closed state to a voltage indicating a door open state;
Recognizing means for recognizing that the door is in a closed state even if the detected contact signal changes to a voltage indicating the open state of the door when the detected voltage change rate is less than a predetermined value. Recognition device.

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