JP4561643B2 - Vehicle door system - Google Patents

Description

  The present invention relates to a vehicle door system.

  Conventionally, there has been a vehicle door system in which the vehicle body side control device 10 and the door unit 20 are communicatively connected via a plurality of communication lines (harnesses) L. FIG. 5 is a block diagram showing a conventional vehicle door system.

  As shown in FIG. 5, the vehicle body side control device 10 includes an output circuit 11, an input circuit 12, an antenna output circuit 13, a CPU 14, and the like. On the other hand, the door unit 20 includes a switching circuit 21, a sensor detection circuit 22, an antenna drive circuit 23, and the like. The sensor detection circuit 22 of the door unit 20 is connected to the lock sensor 31 and the unlock sensor 32 of the handle 30, and the antenna drive circuit 23 of the door unit 20 is connected to the antenna 33 of the handle 30.

  As shown in FIG. 5, the output circuit 11 and the switching circuit 21 are connected by a single communication line L, and the input circuit 12 and the sensor detection circuit 22 are connected by two communication lines L. The antenna output circuit 13 and the antenna drive circuit 23 are connected by two communication lines L.

  The CPU 14 outputs a signal indicating switching between the sensor detection circuit 22 and the antenna driving circuit 23 to the switching circuit 21 via the output circuit 11. Then, the switching circuit 21 switches between the sensor detection circuit 22 and the antenna drive circuit 23 based on a signal indicating this switching.

  The communication line L is connected to the vehicle body side control device 10 and the door unit 20 through through holes provided in the vehicle body and the vehicle door. However, when the number of communication lines L increases, there is a possibility that other communication lines cannot be passed through the through holes.

  The present invention has been made in view of the above problems, and an object thereof is to provide a vehicle door system capable of communication connection with a small number of communication lines.

  In order to achieve the above object, a vehicle door system according to claim 1 is provided in a vehicle body, and includes a vehicle body side control device including a vehicle body side input circuit and a vehicle body side output circuit, and a vehicle door attached to the vehicle body. A door unit having a door side output circuit corresponding to a vehicle body side input circuit and a door side input circuit corresponding to the vehicle body side output circuit, a vehicle body side input circuit and a door side output circuit, and a vehicle body side output A communication line for communication connection between the circuit and the door side input circuit, and communication between the vehicle body side input circuit and the door side output circuit based on a predetermined condition or communication on the communication line, or the vehicle body side output circuit and the door side input circuit And arbitration means for arbitrating to either one of the communications.

  Thus, by providing arbitration means for arbitrating communication on the communication line to either communication between the vehicle body side input circuit and the door side output circuit or communication between the vehicle body side output circuit and the door side input circuit, Since a common communication line can be used from the side control device to the door unit and from the door unit to the vehicle body side control device, the number of communication lines can be reduced.

  When a lock / unlock sensor that outputs a sensor signal indicating the lock / unlock of the vehicle door is provided, the door-side output circuit includes a sensor detection circuit that detects the sensor signal, and a vehicle body side. The input circuit may be a sensor input circuit that inputs an output signal of the sensor detection circuit.

  According to a third aspect of the present invention, the door side input circuit can be an antenna drive circuit that drives an antenna, and the vehicle body side output circuit can be a drive signal output circuit that outputs a drive signal to the antenna drive circuit.

  In addition, as shown in claim 4, the arbitration means periodically transmits a request signal from the antenna by communication between the drive signal output circuit that is the vehicle body side output circuit and the antenna drive circuit that is the door side input circuit, A control circuit is provided for verifying whether the ID code included in the response signal returned in response to the request signal is a regular ID code, and the result of this verification is used as a predetermined condition for determining communication on the communication line. When it is determined that the ID code is a legitimate ID code in the verification, the vehicle body side input circuit and the door side output circuit communicate with each other. Communication with the input circuit can be performed.

  According to a fifth aspect of the present invention, it is preferable that the arbitration means includes a vehicle body side arbitration circuit and a door side arbitration circuit in the vehicle body side control device and the door unit, respectively.

  According to another aspect of the present invention, the vehicle body side control device inputs a signal from the vehicle body side output circuit to the vehicle body side input circuit when the communication direction of the signal on the communication line is from the door unit to the vehicle body side control device. By providing the vehicle body side sneaking prevention circuit for preventing this, a signal can be appropriately transmitted from the door unit to the vehicle body side control device while reducing the number of communication lines.

  According to a seventh aspect of the present invention, the door unit is configured to input a signal from the door side output circuit to the door side input circuit when the communication direction of the signal on the communication line is from the vehicle body side control device to the door unit. By providing the door side sneaking prevention circuit to prevent, it is possible to appropriately transmit a signal from the vehicle body side control device to the door unit while reducing the number of communication lines.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic configuration of a vehicle door system according to an embodiment of the present invention.

  As shown in FIG. 1, the vehicle unit in the present embodiment includes a body ECU 40, a door unit 50, and the like. The body ECU 40 and the door unit 50 are communicatively connected by a communication line L that is commonly used for communication between the input circuit 42 and the sensor detection circuit 52 and communication between the antenna output circuit 43 and the antenna drive circuit 53. . This vehicle door unit is applied to an electronic key system.

  The electronic key system switches the lock / unlock status of each door based on the ID code collation result by bidirectional communication between the portable electronic key and the vehicle (body ECU 40, door unit 50, handle 60). It is something to control.

  In this electronic key system, a predetermined detection area is set inside and outside the vehicle, and an inquiry signal (hereinafter also referred to as a request signal) is transmitted from the vehicle-side antenna 60 at predetermined intervals in this detection area. In this way, the electronic key holder is constantly monitored for approaching the vehicle, getting on the vehicle, and getting off the vehicle.

  For example, when the electronic key holder approaches the vehicle for entering the vehicle and enters the detection area, the electronic key transmits a response signal including an ID code to the vehicle-side receiver in response to the request signal. .

  When this ID code has a predetermined correspondence with the ID code registered in advance, that is, when it is determined that the ID code is a regular ID code, each door is set to the unlock standby state, and the unlock sensor 62 is set. Drive. In this state, when the holder of the electronic key touches the door handle, it is detected by the unlock sensor 62 and the door is unlocked.

  The body ECU 40 corresponds to the vehicle body side control device in the present invention, and is provided on the vehicle body of the vehicle, and includes an output circuit 41, an input circuit 42, an antenna output circuit 43, an arbitration circuit 44, a CPU 45, and the like.

  The output circuit 41 is a circuit that outputs a switching signal indicating whether to use the sensor detection circuit 52 or the antenna driving circuit 53 output from the CPU 45 to the arbitration circuit 44 of the body ECU 40 and the switching circuit 51 of the door unit 50. .

  The input circuit 42 corresponds to the vehicle body side input circuit in the present invention, and is a circuit that inputs a sensor signal output from the sensor detection circuit 52 of the door unit 50 to the CPU 45. The antenna output circuit 43 corresponds to the vehicle body side output circuit of the present invention, and is a circuit that outputs a signal for driving the antenna drive circuit 53 of the door unit 50 (hereinafter also referred to as an antenna drive signal).

  The arbitration circuit 44 corresponds to the vehicle-side arbitration circuit in the present invention, and is used on the input side (input circuit 42) or output based on a switching signal output from the CPU 45 via the output circuit 41. The side (antenna output circuit 43) is switched over. That is, based on the switching signal from the CPU 45, the communication of the signal on the communication line L is arbitrated to either the communication between the input circuit 42 and the sensor detection circuit 52 or the communication between the antenna output circuit 43 and the antenna drive circuit 53. Circuit.

  The CPU 45 performs output control of a switching signal indicating whether to use the sensor detection circuit 52 and the antenna drive circuit 53, output control of a signal for driving the antenna drive circuit 53 of the door unit 50, and a sensor detection circuit 52 of the door unit 50. It is a control circuit which performs lock / unlock control etc. of a vehicle door based on the sensor signal output from.

  The door unit 50 is provided on a vehicle door attached to the vehicle body, and includes a switching circuit 51, a sensor detection circuit 52, an antenna drive circuit 53, an arbitration circuit 54, and the like.

  The switching circuit 51 outputs a switching signal output from the CPU 45 to the arbitration circuit 52, and outputs an operation signal or a stop signal to the sensor detection circuit 52 and the antenna driving circuit 53 based on the switching signal.

  The sensor detection circuit 52 corresponds to the door side output circuit in the present invention, and detects signals from the lock sensor 61 and the unlock sensor 62 and outputs sensor signals. The antenna drive circuit 53 corresponds to the door side input circuit of the present invention, and drives the antenna 63 based on the signal output from the antenna drive circuit 53. For example, the antenna drive circuit 53 transmits a request signal at a reach distance of about 0.7 to 1.0 m by driving the antenna 63 based on the signal output from the antenna drive circuit 53. Therefore, when the vehicle is parked, a detection area corresponding to the arrival distance of the request signal is formed around each door of the vehicle so that the holder of the portable device can immediately detect the approach to the vehicle.

  The arbitration circuit 54 corresponds to the door-side arbitration circuit in the present invention, and is used on the input side (antenna drive circuit 53) based on a switching signal output from the CPU 45 through the switching circuit 51. Whether to use on the output side (sensor detection circuit 52) is switched. That is, based on the switching signal from the CPU 45, the communication of the signal on the communication line L is arbitrated to either the communication between the input circuit 42 and the sensor detection circuit 52 or the communication between the antenna output circuit 43 and the antenna drive circuit 53. Circuit. Therefore, the CPU 45, the output circuit 41, the arbitration circuit 44, the switching circuit 51, and the arbitration circuit 54 correspond to the arbitration means in the present invention.

  The handle 60 includes a lock sensor 61 including a touch sensor, a push switch, an unlock sensor 62, an antenna 63 that transmits radio waves, and the like.

  Here, the circuit configuration of the body ECU 40 and the door unit 50 will be specifically described with reference to an example shown in FIG. FIG. 2 is a circuit diagram showing a schematic configuration of the vehicle door system in the embodiment of the present invention.

  As shown in FIG. 2, the output circuit 41 of the body ECU 40 includes a resistor and a transistor. When the output A of the CPU 45 is L (low), the output SEL of the body ECU 40 is H (high), and the output A of the CPU 45 is In the case of H (high), the output SEL of the body ECU 40 is L (low).

  As shown in FIG. 2, the arbitration circuit 44 of the body ECU 40 includes a resistor, a transistor, a diode, and the like. When the output A of the CPU 41 is L (low), the transistor B is off and the anode side of the diode is L. . At this time, the buffers C and D of the antenna output circuit 43 are turned on, and a signal for driving the antenna drive circuit 53 is output.

  Further, when the output A of the CPU 41 is H, the arbitration circuit 44 of the body ECU 40 turns on the transistor B, enters the resistance pull-up state, and reads the signals at the terminals X and Y. At this time, the buffers C and D of the antenna output circuit 43 are turned off and are in a high impedance state, and function as a vehicle body side sneak prevention circuit that prevents signals from the antenna output circuit 43 from being input to the input circuit 42. To do.

  On the other hand, as shown in FIG. 2, the switching circuit 50 of the door unit 50 includes a transistor, a resistor, a buffer, and the like. When the output SEL of the body ECU 40 is H (high), the transistor E is turned off. Then, the sensor detection circuit 52 is turned off and the antenna drive circuit is turned on.

  As shown in FIG. 2, the arbitration circuit 54 includes an output transistor, an AND circuit, and the like. When the output SEL of the body ECU 40 is H (high), the transistor E is turned off and the input from the transistor E is L (low). As a result, the outputs of the AND circuits F and G become L (low), and the output transistor also turns off. In this manner, the sensor detection circuit 52 also functions as a door side sneak prevention circuit that prevents the signal input to the antenna drive circuit 53 from being input.

  Conversely, in the switching circuit 50, when the output SEL of the body ECU 40 is L (low), the transistor E is turned on. Then, the sensor detection circuit 52 is turned on and the antenna drive circuit is turned off. The outputs of the AND circuits F and G of the arbitration circuit 54 become an input H (high) from the transistor E, and each output transistor is turned on / off by a signal from the sensor detection circuit 52.

  Next, operations of the body ECU 40 and the door unit 50 will be described using the flowcharts shown in FIGS. 3 and 4. FIG. 3 is a flowchart showing the operation of the vehicle side control device in the embodiment of the present invention. FIG. 4 is a flowchart showing the operation of the door unit in the embodiment of the present invention.

  First, the operation of the body ECU 40 will be described. The flowchart shown in FIG. 3 starts when power is supplied from the battery + B.

  In step S10, the CPU 45 determines whether or not the touch sensor which is the unlock sensor 62 has been driven. If it is determined that the unlock sensor 62 has been driven, the process proceeds to step S11, where the unlock sensor 62 is driven. If it is determined that there is not, the process proceeds to step S15. In the present embodiment, the case where the unlock sensor 62 is used will be described as an example. However, the present invention is not limited to this, and the object of the present invention can be achieved even with the lock sensor 61. It is.

  When the CPU 45 determines that the ID code included in the response signal returned in response to the request signal has a predetermined correspondence with the ID code registered in advance, that is, when determining that the ID code is a regular ID code, The door is set to the unlock standby state, and the unlock sensor 62 is driven.

  In step S11, the CPU 45 outputs L (low) from the output A, and the output circuit 41 outputs H (high) from the output SEL of the body ECU 40. Thereby, in step S12, the arbitration circuit 44 is used on the output side (antenna output circuit 43), that is, communication of signals on the communication line L is used for communication between the antenna output circuit 43 and the antenna drive circuit 53.

  In step S13, the CPU 45 determines whether or not to drive the antenna 63. If the radio wave is output from the antenna 63, the CPU 45 assumes that the antenna 63 is driven and proceeds to step S14. 63 is regarded as not being driven, and the process returns to step S10. In step S <b> 14, the CPU 45 outputs an antenna drive signal for driving the antenna drive circuit 53 via the antenna output circuit 43 and the signal line L.

  On the other hand, if it is determined in step S10 that the unlock sensor 62 is not driven, in step S15, the CPU 45 outputs H (high) from the output A, and the output circuit 41 outputs L from the output SEL of the body ECU 40. (Low) is output. Accordingly, in step S <b> 16, the arbitration circuit 44 is used on the input side (input circuit 42), that is, signal communication on the communication line L is used for communication between the input circuit 42 and the sensor detection circuit 52. In step S <b> 17, the CPU 45 inputs the sensor signal output from the sensor detection circuit 52 via the signal line L and the input circuit 42.

  Next, the operation of the door unit 50 will be described. The flowchart shown in FIG. 4 starts when power is supplied from the battery + B.

  In step S20, the switching circuit 51 determines whether or not the output SEL of the body ECU 40 is H (high). If it is determined that the output SEL is H (high), the process proceeds to step S21 and is not H (high). If determined, the process proceeds to step S26.

  In step S21, the switching circuit 50 turns off the transistor E when the output SEL of the body ECU 40 is H (high). Then, the sensor detection circuit 52 is turned off and the antenna drive circuit is turned on. Therefore, the arbitration circuit 54 is used on the input side (antenna drive circuit 53), that is, communication of signals on the communication line L is used for communication between the antenna output circuit 43 and the antenna drive circuit 53.

  In step S22, it is determined whether or not there is an antenna drive signal from the antenna output circuit 43 of the body ECU 40. If it is determined that there is an antenna drive signal, the process proceeds to step S23, and the antenna drive signal from the antenna output circuit 43 is received. If it is determined that there is not, the process proceeds to step S24. In step S23, the antenna drive circuit 53 drives the antenna 63 and transmits a radio wave (request signal or the like) corresponding to the antenna drive signal. In step S24, the antenna drive circuit 53 returns to step S20 without driving the antenna 63.

  On the other hand, if it is determined in step S20 that it is not H (high), in step S25, the switching circuit 50 turns on the transistor E when the output SEL of the body ECU 40 is L (low). Then, the sensor detection circuit 52 is turned on and the antenna drive circuit is turned off. Accordingly, the outputs of the AND circuits F and G of the arbitration circuit 54 become the input H (high) from the transistor E, and the arbitration circuit 54 is used on the output side (sensor detection circuit 52), that is, communication of signals on the communication line L. Is used for communication between the input circuit 42 and the sensor detection circuit 52.

  In step S26, it is determined whether or not the touch sensor (unlock sensor 62) is detected, and when the unlock sensor 62 outputs a signal indicating that the holder of the electronic key has touched the unlock sensor 62, Assuming that there is a detection, the process proceeds to step S27, and if the signal indicating that the holder of the electronic key has touched the unlock sensor 62 is not output, it is regarded that there is no detection and the process proceeds to step S28.

  In step S27, the sensor detection circuit 52 outputs a signal (sensor signal) indicating that the holder of the electronic key has touched the unlock sensor 62 via the signal line L to the input circuit. In step S28, the sensor detection circuit 52 turns off the signal and proceeds to step S20.

  In this way, the communication between the communication line L and the communication between the input circuit 42 and the sensor detection circuit 52 or the communication between the antenna output circuit 43 and the antenna drive circuit 53 is arbitrated from the body ECU 40 to the door unit. 50 and the door unit 50 to the body ECU 40 can use a common communication line L, so the number of communication lines L can be reduced.

It is a block diagram showing a schematic structure of a vehicle door system in an embodiment of the invention. It is a circuit diagram showing a schematic structure of a vehicle door system in an embodiment of the invention. It is a flowchart which shows operation | movement of the vehicle side control apparatus in embodiment of this invention. It is a flowchart which shows operation | movement of the door unit in embodiment of this invention. It is a block diagram which shows the conventional vehicle door system.

Explanation of symbols

40 body ECU, 41 output circuit, 42 input circuit, 43 antenna output circuit, 44 arbitration circuit, 45 CPU, 50 door unit, 51 switching circuit, 52 sensor detection circuit, 53 antenna drive circuit, 54 arbitration circuit, 60 handle, 61 Lock sensor, 62 Unlock sensor, 63 Antenna, L Communication line

Claims (7)

A vehicle body side control device that is provided in the vehicle body and includes a vehicle body side input circuit and a vehicle body side output circuit;
A door unit provided on a vehicle door attached to the vehicle body and provided with a door side output circuit corresponding to the vehicle body side input circuit and a door side input circuit corresponding to the vehicle body side output circuit;
A communication line for communication connection between the vehicle body side input circuit and the door side output circuit, and the vehicle body side output circuit and the door side input circuit;
Arbitration that mediates communication on the communication line to one of communication between the vehicle body side input circuit and the door side output circuit or communication between the vehicle body side output circuit and the door side input circuit based on a predetermined condition. Means,
A vehicle door system comprising:   It includes a lock / unlock sensor that outputs a sensor signal indicating lock / unlock of the vehicle door, the door side output circuit is a sensor detection circuit that detects the sensor signal, and the vehicle body side input circuit is The vehicle door system according to claim 1, wherein the vehicle door system is a sensor input circuit that inputs an output signal of the sensor detection circuit.   3. The door-side input circuit is an antenna drive circuit that drives an antenna, and the vehicle body-side output circuit is a drive signal output circuit that outputs a drive signal for the antenna drive circuit. Vehicle door system as described in. The arbitration means periodically transmits a request signal from the antenna through communication between the drive signal output circuit that is the vehicle body side output circuit and the antenna drive circuit that is the door side input circuit, and responds to the request signal. A control circuit for verifying whether or not the ID code included in the response signal returned is a regular ID code,
The control circuit communicates with the vehicle body side input circuit and the door side output circuit when it is determined as a predetermined ID code in the verification as the predetermined condition, and is not a normal ID code in the verification. 4. The vehicle door system according to claim 3, wherein communication with the vehicle body side output circuit and the door side input circuit is performed when it is determined as follows.   The said mediation means includes the vehicle body side mediation circuit provided in the said vehicle body side control apparatus, and the door side mediation circuit provided in the said door unit, The Claim 1 thru | or 4 characterized by the above-mentioned. Vehicle door system.   The vehicle body side control device prevents a signal from the vehicle body side output circuit from being input to the vehicle body side input circuit when a communication direction of a signal on the communication line is from the door unit to the vehicle body side control device. The vehicle door system according to any one of claims 1 to 5, further comprising a vehicle body side turning-in prevention circuit.   The door unit prevents a signal from the door-side output circuit from being input to the door-side input circuit when the communication direction of the signal on the communication line is the door unit from the vehicle body-side control device. The vehicle door system according to any one of claims 1 to 6, further comprising a wraparound prevention circuit.

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