FB-354PCT SPECIFICATION TITLE OF THE INVENTION SLIDE DOOR CURRENT-CARRYING SYSTEM 5 TECHNICAL FIELD [0001] This invention relates to a slide door current-carrying system for electrically connecting a body side and a slide door side of a vehicle. 10 BACKGROUND ART [0002] Known slide door current-carrying systems include those provided with a junction switch with a plurality of junction terminals, each junction terminal having a body side 15 terminal and a slide door side terminal as a pair (see Patent Document 1). With this type of slide door current-carrying system, whena slide door is operated for closingandput into ahalf-open condition, for instance, the body side terminal and the slide 20 door side terminal of each pair of junction terminals of the junction switch make contact with each other, which puts the junction switch into a connected condition to electrically connect the body side and the slide door side. [0003] As a result, an on-signal from the junction switch 25 is input to a feed control unit that is arranged on the body side. This signal actuates a feed relay of the feed control 1 unit to start feeding an easy closer control unit on the slide door side from the body side. Subsequently, a full lock motor of the slide door is actuated by a control signal from the easy closer control unit which is being fed with electricity. This puts the slide door into a completely closed condition from the half-open condition. In this way, the slide door current-carrying system detects the connection status of the junction switch on the body side by way of the junction terminals of the junction switch. PRIOR ART DOCUMENT Patent Document [0004] Patent Document 1: JP-A-09-156376 [0005] For example, in the slide door current-carrying system configured as mentioned above, there may be a demand for an additional feature to detect the running speed of a vehicle and automatically lock the slide door of the vehicle (an auto-lock feature based on a vehicle running speed). In such a case, the slide door needs to be provided with a door lock switch that is turned on when the slide door is unlocked and turned off when the slide door is locked. And, an on/off signal of the door lock switch needs to be acquired on the body side in order to detect the locked or unlocked condition of the slide door. 8297262 2 [0006] For this purpose, separate junction terminals are required in order to send the on/off signal of the door lock switch to the body side from the slide door side. However, existing commercial motor vehicles are designed with a limited number of junction terminals and hence, all the existing junction terminals may be occupied and new junction terminals can hardly be added. Thus, it has not been possible to add a system for detecting the locked or unlocked condition of a slide door on the body side, such as the auto-lock feature based on a vehicle running speed in an easy way and at a low cost. [0007] In view of the above identified problem, a need exists to provide a low cost slide door current-carrying system that can appropriately detect the connection status of the junction switch, and the locked or unlocked state of the slide door on the body side. SUMMARY [0008] According to an aspect of the present disclosure, there is provided a slide door current-carrying system comprising a junction switch having a plurality of junction terminals, each junction terminal being composed of a body side terminal and a slide door side terminal as a pair, so as to establish an electrical connection between a body side and a slide door side by bringing the body side terminal and the slide door side terminal of each junction terminal into contact to each other, wherein 8297262 3 a junction connection detection circuit for detecting a connection status of the junction switch on the body side and a door lock detection circuit for detecting a locked or unlocked state of the slide door on the body side are respectively arranged extending over the body side and the slide door side by way of the junction switch; the junction connection detection circuit has a door opening/closing switch on the slide door side, which is turned on when the slide door is in an open state and is turned off when the slide door is in a closed state, and is connected to a junction connection detection section for detecting the connection status of the junction switch on the body side; the door lock detection circuit has a door lock switch on the slide door side, which is turned on when the slide door is in an unlocked state and is turned off when the slide door is in a locked state and is connected to a door lock detection section for detecting the locked or unlocked state of the slide door on the body side; and the junction connection detection circuit and the door lock detection circuit have a common circuit section where one junction terminal in the junction switch is shared, and the door opening/closing switch and the door lock switch are connected in parallel to each other on the slide door side. [0009] Thus, in a slide door current-carrying system according to an aspect of the present disclosure, the junction connection detection circuit having a door opening/closing switch and a door lock detection circuit having a door lock switch are 8297262 4 separately formed by way of the junction switch. Additionally, the junction connection detection circuit and the door lock detection circuit have a common circuit section where one junction terminal in the junction switch is shared and the door opening/closing switch and the door lock switch are connected in parallel to each other on the slide door side. [0010] In other words, the slide door current-carrying system is configured so that a synthesis signal of an on/off signal of the door opening/closing switch and an on/off signal of the door lock switch can be acquired in the junction connection detection section and the door lock detection section arranged on the body side by way of one junction terminal of the junction switch shared in the common circuit section. Since the door opening/closing switch and the door lock switch are connected in parallel to each other, the synthesis signal is acquired as an on signal in the cases that one of the switches is turned on and the other switch is turned off and that both of the switches are on, and the synthesis signal is acquired as an off signal in the case that both of the switches are turned off. [0011] In addition, under favor of the workings of the door opening/closing switch that is turned on when the slide door 8297262 5 FB-354PCT is in an open state and is turned off when the slide door is in a closed state, the junction connection detection section and the door lock detection section on the body side can detect appropriately the connection status of the junction switch that 5 is required when the slide door is in a half-open state and also a locked state of the slide door that is required after the slide door is completely closed only from the information of a single synthesis signal transmitted from the slide door side. [0012] Specifically, when the slide door is operated for 10 closing to fall into a half-open state and the junction switch is put into a connected state, the door opening/closing switch is turned on because the slide door is not completely closed and in an open state. This means that the door opening/closing switch is necessarily on until the slide door is completely 15 closed and hence the synthesis signal that is obtained when the junction switch is put into a connected state is an on-signal regardless of whether the door lock switch is turned on or off. Thus, as an on-signal is input to the junction connection detection section as a synthesis signal, it can detect the 20 connected state of the junction switch. [0013] Besides, when the slide door is completely closed to get into a closed state, the door opening/closing switch is turned off. And, after the slide door got into a closed state, the synthesis signal is decided to be either an on-signal or 25 an off-signal corresponding to ON state or OFF state of the door lock switch so long as the slide door is in a closed state. 6 Therefore, the door lock detection section arranged on the body side can detect whether the slide door is in an unlocked state or in a locked state based on an on-signal or an off-signal input as a synthesis signal. [0014] According to the above-described arrangement, the slide door current-carrying system can appropriately detect the connection status of the junction switch and a locked or unlocked state of the slide door on the body side. Additionally, since the slide door current-carrying system can detect the above mentioned both states by way of a single junction terminal of the junction switch, for example, it can be configured so as to detect the above-mentioned both states by way of the single junction terminal that is employed to detect the connection status of the junction switch. In other words, it is possible to detect the locked or unlocked state of the slide door easily and inexpensively without increasing the number of junction terminals. Accordingly, a system for detecting the locked or unlocked sate of the slide door on the body side of a motor vehicle, such as the auto-lock feature based on a vehicle running speed, can be added easily and inexpensively even to a commercial motor vehicle that is designed with a limited number of junction terminals and hence all the existing junction terminals may be occupied and new junction terminals can hardly be added. [0015] Thus, an aspect of the present disclosure can provide a low-cost slide door current-carrying system that can appropriately detect the connection status of the junction switch and the locked or unlocked state of the slide door on the body side. 8297262 7 BRIEF DESCRIPTION OF THE DRAWINGS [0016] FIG. 1 is a schematic block diagram of an embodiment of the slide door current-carrying system. FIG. 2 is a timing chart of operation of the embodiment of the slide door current-carrying system. DETAILED DESCRIPTION [0017] In the present invention an open state of the slide door refers to a state where the slide door is open and includes a half-open state. Likewise, a close state of the slide door refers to a state where the slide door is completely closed (completely closed state). [0018] Preferably, a closer control means for controlling the operation of a closer mechanism for bringing a half-open state of the slide door into a closed state and a door lock mechanism for locking the slide door are arranged on the slide door side, while a feed control means for controlling the feed to the closer control means according to a detection of the connection status of the junction switch at the junction connection detection section and a door lock control means for controlling the operation of the door lock mechanism according to a detection of the locked or unlocked state of the slide door 8297262 8 FB-354PCT at the door lock detection section are arranged on the body side. If such is the case, a slide door current-carrying system can be so configured that, when the junction connection detection section detects that the junction switch is in a 5 connected state, the feed control means starts feeding the closer control means and then the closer control means actuates the closer mechanism to bring the slide door into a completely closed state, or a closed state, from a half-open state. Additionally, it can be so configured that, if the door lock 10 detection section detects that the slide door is in an unlocked state, the door lock control means actuates the door lock mechanism to bring the slide door into a locked state from the unlocked state. 15 EMBODIMENT [0019] Referring to FIG. 1, an embodiment of the slide door current-carrying system according to the present invention will be described below. This embodiment of slide door current-carrying system 1 20 comprises a junction switch 2 having a plurality of junction terminals 21a to 21e, each junction terminal including a body side terminal 211 and a slide door side terminal 212 as a pair, so as to establish an electrical connection between the body side and the slide door side by bringing the body side terminal 25 211 and the slide door side terminal 212 of each junction terminal 21a to 21e into contact to each other. 9 FB-354PCT [0020] In the slide door current-carrying system 1, a feed control unit (feed control means) 3 for controlling the feed to a closer control unit (closer control means) 5, which will be described hereinafter, and a door lock control unit (door 5 lock control means) 4 for controlling the operation of a door lock motor (door lock mechanism) 61, which will also be described hereinafter, are arranged on the body side. The feed control unit 3 includes a junction connection detection section 31 for detecting the connection status of the 10 junction switch 2 and a feed relay 32 for feeding electricity from the body side to the slide door side. [0021] A junction connection detection circuit 11 is formed extending over the body side and the slide door side by way of the junction terminal 21e of the junction switch 2 to 15 detect the connection status of the junction switch 2 and is connected to the junction connection detection section 31. A feed circuit 12 for feeding electricity from the slide door side to the body side is formed extending over the body side and the slide door side by way of the junction terminal 20 21d of the junction switch 2 and is connected to the feed relay 32. The junction connection detection section 31 and the feed relay 32 are connected to each other in the feed control unit 3 and the feed relay 32 is configured so as to be actuated by 25 a control signal from the junction connection detection section 31. 10 FB-354PCT [00221 The door lock control unit 4 includes a door lock detection section 41 for detecting the locked or unlocked state of the slide door. A door lock detection circuit 14 is formed extending over 5 the body side and the slide door side by way of the junction terminals 21c and 21e of the junction switch 2 to detect the locked or unlocked state of the slide door and is connected to the door lock detection section 41. [0023] A door lock output circuit 13 is formed extending 10 over the body side and the slide door side by way of the junction terminal 21a and 21b of the junction switch 2 to output a control signal to the door lock motor 61 arranged at the door lock section 6 in the slide door and is connected to the door lock control unit 4. 15 The door lock control unit 4 is configured so as to output a control signal to the door lock motor 61 and actuate the door lock motor 61 to lock the slide door when the running speed of the motor vehicle exceeds a predetermined speed and the door lock detection section 41 detects an unlocked state of the slide 20 door. [0024] On the other hand, the closer control unit 5 is arranged on the slide door side to control the operation of a closer motor (closer mechanism) 71 that brings a half-open state of the slide door into a closed state. 25 The closer control unit 5 is connected to the feed relay 32 of the feed control unit 3 by way of the feed circuit 12. 11 FB-354PCT Additionally, a closer output circuit 15 for outputting a control signal to the closer motor 71 that is arranged in a closer section 7 of the slide door is connected to the closer control unit 5. 5 [0025] As described above, the junction connection detection circuit 11 is connected to the junction connection detection section 31 of the feed control unit 3 on the body side. It also has on the slide door side a door opening/closing switch 111 that is turned on when the slide door is in an open state 10 and is turned off when the slide door is in a closed state. The door opening/closing switch 111 is arranged in the closer section 7 in the slide door. [0026] Also as described above, the door lock detection circuit 14 is connected to the door lock detection section 41 15 of the door lock control unit 4 on the body side. It additionally has on the slide door side a door lock switch 141 that is turned on when the slide door is in an unlocked state and turned off when the slide door is in a locked state. The door lock switch 141 is arranged at the door lock section 6 in 20 the slide door. [0027] The junction connection detection circuit 11 and the door lock detection circuit 14 commonly have a common circuit section 10 where the junction terminal 21e of the junction switch 2 is shared , extending over the body side and 25 the slide door side. The junction connection detection section 31 of the feed 12 FB-354PCT control unit 3 and the door lock detection section 41 of the door lock control unit 4 are separately connected to the common circuit section 10 on the body side. The door opening/closing switch 111 and the door lock switch 141 are connected in parallel 5 to each other on the slide door side. [00281 With the above-described arrangement, the junction connection detection section 31 on the body side is connected to the door opening/closing switch 111 of the closer section 7 on the slide door side by way of the common circuit section 10 10 and the junction terminal 21e of the junction switch 2 in the junction connection detection circuit 11. Additionally, the door opening/closing switch 111 is connected to an earth connection 81 on the slide door side. [0029] Besides, in the door lock detection circuit 14, the 15 door lock detection section 41 on the body side is connected to the door lock switch 141 of the door lock section 6 on the slide door side by way of the common circuit section 10 and the junction terminal 21e of the junction switch 2. Additionally, the door lock switch 141 is connected to an earth connection 20 82 on the body side by way of the junction terminal 21c of the junction switch 2. [0030] Then, the operation of the slide door current-carrying system 1 consigured as mentioned above will be described below by referring to the timing chart of FIG. 2. 25 When the slide door is operated for closing and falls in a half-open state (tl in FIG. 2), the body side terminals 211 13 FB-354PCT and the corresponding slide door side terminals 212 of the junction terminals 21a to 21e of the junction switch 2 are respectivelymade to contactwitheachother. Then, as a result, an electrical connection is established between the body side 5 and the slide door side. [0031] At this time, the door opening/closing switch 111 is turned on because the slide door is not completely closed and in an open state. The door lock switch 141 is also on because the slide door is in an open state and hence in an unlocked state. 10 Therefore the synthesis signal S of the door opening/closing switch 111 and the door lock switch 141 is aquired as an on-signal. In actuality, since the door opening/closing switch 111 is necessarily on until the slide door is completely closed, 15 the synthesis signal S is acquired as an on-signal regardless of whether the door lock switch 141 is turned on or off (Tl in FIG. 2). [00321 The on-signal of synthesis signal S is input to the junction connection detection section 31 of the feed control 20 unit 3 on the body side by way of the common circuit section 10 and the junction terminal 21e of the junction switch 2. Then, as a result, the junction connection detection section 31 of the feed control unit 3 detects that the junction switch 2 is put into a connected state. 25 [0033] Subsequently, a control signal is output from the junction connection detection section 31 of the feed control 14 FB-354PCT unit 3 to the feed relay 32 according to the on-signal of synthesis signal S to actuate the feed relay 32 and start feeding the closer control unit 5 with electricity by way of the feed circuit 12. 5 As a result, a battery voltage is applied to the closer control unit 5 so that the closer control unit 5 is put into a condition of being fed with electricity. Then, a control signal is output from the closer control unit 5 to the closer motor 71 of the closer section 7 by way of the closer output 10 circuit 15 to actuates the closer motor 71 so that the slide door gets into a completely closed state (closed state) from a half-open state. The feeding is automatically stopped when a predetermined time period elapses after the slide door gets into a closed state. 15 [0034] Subsequently, when the slide door is completely closed to get into a closed state (t2 in FIG. 2), the door opening/closing switch 111 is turned off. And, after the slide door got into a closed state, the synthesis signal S is decided to be either an on-signal or an off-signal corresponding to ON 20 state or OFF state of the door lock switch 141 so long as the slide door is in a closed state (so long as the door opening/closing switch 111 remains to be in OFF state) (T2 in FIG. 2). Thereafter, if the running speed of the motor vehicle 25 exceeds a predetermined speed and the door lock detection section 41 of the door lock control unit 4 detects an unlocked 15 FB-354PCT state of the slide door and hence an on-signal of synthesis signalS is input to the door lock detection section 41, a control signal is output from the door lock control unit 4 to the door lock motor 61 by way of the door lock output circuit 13 to actuate 5 the door lock motor 61 to put the slide door into a locked state from an unlocked state. [0035] Now, the advantages of this embodiment of the slide door current-carrying system 1 will be described below. In the slide door current-carrying system 1 of this 10 embodiment, a junction connection detection circuit 11 having a door opening/closing switch 111 and a door lock detection circuit 14 having a door lock switch 141 are separately formed by way of the junction switch 2. And the junction connection detection circuit 11 and the door lock detection circuit 14 have 15 a common circuit section 10 where one junction terminal 21 (21e) in the junction switch 2 is shared, and the door opening/closing switch 111 and the door lock switch 141 are connected in parallel to each other on the slide door side. [0036] In other words, the slide door current-carrying 20 system 1 is configured so that synthesis signal S of an on/off signal of the door opening/closing switch 111 and an on/off signal of the door lock switch 141 can be acquired in the junction connection detection section 31 and the door lock detection section 41 on the body side byway of the single junction terminal 25 21 (21e) of the junction switch 2 in the common circuit section 10. 16 FB-354PCT [0037] In addition, under favor of the workings of the door opening/closing switch 111 that is turned on when the slide door is in an open state and is turned off when the slide door is in a closed state, the junction connection detection section 5 31 and the door lock detection section 41 on the body side can detect appropriately the connection status of the junction switch 2 that is required when the slide door is in a half-open state and also a locked state of the slide door that is required after the slide door is completely closed only from the 10 information of a single synthesis signal transmitted from the slide door side. [0038] Specifically, when the slide door is operated for closing to fall into a half-open state and the junction switch 2 is put into a connected state (tl in FIG. 2), the door opening/ 15 closing switch 111 is turned on because the slide door is not completely closed and in an open state. This means that the door opening/closing switch 111 is necessarily on until the slide door is completely closed and hence the synthesis signal S that is obtained when the junction switch 2 is put into a 20 connected state is an on-signal regardless of whether the door lock switch 141 is turned on or off (tl in FIG. 2). Thus, as an on-signal is input to the junction connection detection section 31 as a synthesis signal, it can detect the connected state of the junction switch 2. 25 [0039] Besides, when the slide door is completely closed to get into a closed state (T2 in FIG. 2), the door 17 FB-354PCT opening/closing switch 111 is turned off. And, after the slide door got into a closed state, the synthesis signal S is decided to be either an on-signal or an off-signal corresponding to ON state or OFF state of the door lock switch 141 so long as the 5 slide door is in a closed state (T2 in FIG. 2). Therefore, the door lock detection section 41 arranged on the body side can detect whether the slide door is in an unlocked state or in a locked state based on an on-signal or an off-signal input as a synthesis signal S. 10 [00401 According to the above-described arrangement, the slide door current-carrying system 1 can appropriately detect the connection status of the junction switch 2 and a locked or unlocked state of the slide door on the body side. Additionally, since the slide door current-carrying 15 system 1 can detect the above mentioned both states by way of a single junction terminal 21 (21e) of the junction switch 2, for example, it can be configured so as to detect the above mentioned both states by way of the single junction terminal 21 that is employed to detect the connection status of the 20 junction switch 2. In other words, it is possible to detect the locked or unlocked state of the slide door easily and inexpensively without increasing the number of junction terminals 21. Accordingly, a system for detecting the locked or unlocked state of the slide door on the body side of a motor 25 vehicle, such as the auto-lock feature based on a vehicle running speed, can be added easily and inexpensively even to 18 FB-354PCT a commercial motor vehicle that is designed with a limited number of junction terminals and hence all the existing junction terminals 21 may be occupied and new junction terminals 21 can hardly be added. 5 [0041] In this embodiment, the closer control unit 5, which controls the operation of the closer motor 71 that brings a half-open state of the slide door into a closed state and the door lock motor 61, which is used to lock the slide door, are arranged on the slide door side. Similarly, the feed control 10 unit 3, which controls the feed to the closer control unit 5 according to the detected connection status of the junction switch 2 at the junction connection detection section 31, and the door lock control unit 4, which controls the operation of the door lock motor 61 according to a locked or unlocked slide 15 door state detected at the door lock detection section 41 are arranged on the body side. [0042] Therefore, it is possible to configure the slide door current-carrying system such that the feed control unit 3 starts feeding the closer control unit 5 and the closer control 20 unit 5 actuates the closer motor 71 to bring the slide door in a half-open state into a completely closed state, that is a closed state where the junction connection detection section 31 detects that the junction switch 2 is in a connected state. Additionally, it is also possible to configure the slide door 25 current-carrying system such that the door lock control unit 4 actuates the door lock motor 61 to bring the slide door into 19 FB-354PCT a locked state from an unlocked state where the running speed of the motor vehicle exceeds a predetermined speed and the door lock detection section 41 detects that the slide door is in an unlocked state. 5 [0043] Thus, the present invention can provide a low-cost slide door current-carrying system that can appropriately detect the connection status of the junction switch, and the locked or unlocked state of the slide door on the body side. 20