JP2017175385A - Receiver and vehicle door lock system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a receiver and a vehicle door lock system, capable of receiving an operation signal transmitted from portable equipment at arbitrary timing, while suppressing battery consumption.SOLUTION: A receiver 10, connected to an antenna which receives a signal transmitted by radio communication to process the signal input through the antenna, includes: a distributer which distributes the signal input through the antenna; a detector which detects one of signals distributed by the distributer to output a detection signal; and a reception circuit, having an input terminal to which the detection signal from the detector is input, which is activated when the detection signal is input through the input terminal from the detector which has a voltage level of a threshold level or higher, to start to receive the other signal distributed by the distributer.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a receiving device and a vehicle door locking system that receive a signal transmitted wirelessly.

  A door lock system that enables locking and unlocking of a vehicle door without using a mechanical key has been put into practical use. In a keyless entry system which is one of such door lock systems, when a user performs an operation on an operation unit (a lock button or an unlock button) provided in the portable device, an operation signal is transmitted from the portable device to the in-vehicle device. The vehicle door locking control or unlocking control is performed by the vehicle-mounted device that has received the operation signal.

JP 2005-307646 A

  However, since the keyless entry system described above is configured to transmit an operation signal to the in-vehicle device side in response to an operation of a user carrying the portable device, the operation signal transmitted from the portable device can be received at an arbitrary timing. It is necessary to drive the in-vehicle device.

  Specifically, when the receiving IC (Integrated Circuit) provided in the in-vehicle device is intermittently driven and the preamble of the signal transmitted from the portable device is received during the intermittent driving, the microcomputer of the in-vehicle device is turned on and the data following the preamble Receive the part and process it. At this time, it is necessary to intermittently drive the reception IC at a time interval shorter than the preamble transmission time so as not to miss the preamble of the signal transmitted from the portable device, so that the battery consumption cannot be suppressed. Had.

  The present invention has been made in view of such circumstances, and provides a receiving device and a vehicle door locking system capable of receiving an operation signal from a portable device transmitted at an arbitrary timing while suppressing battery consumption. The purpose is to do.

  A receiving device according to one embodiment of the present invention is connected to an antenna that receives a signal transmitted by wireless communication, and distributes a signal input through the antenna in a receiving device that processes a signal input through the antenna. A divider, a detector for detecting one of the signals distributed by the divider and outputting a detection signal, and an input terminal for receiving the detection signal from the detector; A receiving circuit that is activated when a detection signal from the detector having a voltage level equal to or higher than a threshold level is input and starts receiving the other of the signals distributed by the distributor.

  A vehicle door locking system according to an aspect of the present invention includes an operation unit that receives an operation related to locking or unlocking a door provided in a vehicle, and transmits an operation signal when the operation unit receives the operation. And a receiving unit that receives an operation signal transmitted from the portable device through an antenna, and performs control related to locking or unlocking the door based on the operation signal received by the receiving unit. A receiving device for distributing a signal input through the antenna, and detecting one of the signals distributed by the distributor and outputting a detection signal. And an input terminal to which a detection signal from the detector is input, and is activated when a detection signal from the detector having a voltage level equal to or higher than a threshold level is input through the input terminal. Te, and a receiving circuit for starting receiving the other of the distributed signals by the distributor.

  According to the present application, it is possible to receive an operation signal from a portable device transmitted at an arbitrary timing while suppressing battery consumption.

3 is a block diagram illustrating a configuration of a receiving apparatus according to Embodiment 1. FIG. It is a circuit diagram which shows the structural example of a detector. It is a circuit diagram which shows the structural example of receiving IC. It is explanatory drawing explaining operation | movement of a receiver. 6 is a block diagram illustrating a configuration of a receiving apparatus according to Embodiment 2. FIG. It is a mimetic diagram explaining the schematic structure of the door lock system concerning this embodiment.

  Embodiments of the present invention will be listed and described. Moreover, you may combine arbitrarily at least one part of embodiment described below.

  A receiving apparatus according to one aspect of the present application is connected to an antenna that receives a signal transmitted by wireless communication, and distributes a signal input through the antenna in a receiving apparatus that processes the signal input through the antenna. , A detector for detecting one of the signals distributed by the distributor and outputting a detection signal, and an input terminal for receiving the detection signal from the detector, and a threshold value through the input terminal A receiving circuit that is activated when a detection signal from the detector having a voltage level equal to or higher than a level is input and starts receiving the other of the signals distributed by the distributor.

  In the above aspect, since the receiving circuit is activated at the timing when the signal is received by the antenna, the power consumption can be suppressed as compared with the conventional configuration in which the receiving circuit is intermittently operated.

  In the receiving device according to one aspect of the present application, the detector includes a switch that resets a voltage level of a detection signal to be output, and a control signal that activates the switch when reception of the signal from the previous distributor is completed Is further provided to the detector.

  In the above aspect, the reception circuit can be quickly changed from the activated state to the sleep state by resetting the voltage level of the detection signal after the signal reception is completed.

  In the receiving device according to one aspect of the present application, the signal received through the antenna includes a preamble indicating the start of a frame and a data portion following the preamble, and the detector outputs a detector during reception of the preamble. The voltage level is adjusted so that the voltage level of the signal is equal to or higher than the threshold level.

  In the above aspect, the receiving circuit can be activated by the detection signal output from the detector.

  In the receiving device according to one aspect of the present application, the antenna is a narrowband antenna that receives radio waves in a specific frequency band.

  In the above aspect, by passing only a signal having a desired frequency, it is possible to suppress input to the detector and prevent the receiving circuit from being inadvertently activated.

  A receiving apparatus according to an aspect of the present application includes a band filter that allows a signal in a specific frequency band to pass between the antenna and the distributor.

  In the above aspect, by passing only a signal having a desired frequency, it is possible to suppress input to the detector and prevent the receiving circuit from being inadvertently activated.

  A vehicle door locking system according to an aspect of the present application includes an operation unit that receives an operation related to locking or unlocking a door provided in a vehicle, and transmits an operation signal when the operation unit receives the operation. An in-vehicle control device that includes a portable device and a receiving unit that receives an operation signal transmitted from the portable device through an antenna, and performs control related to locking or unlocking the door based on the operation signal received by the receiving unit; The receiver includes a distributor that distributes a signal input through the antenna, and a detector that detects one of the signals distributed by the distributor and outputs a detection signal. And an input terminal to which a detection signal from the detector is input, and is activated when a detection signal from the detector having a voltage level equal to or higher than a threshold level is input through the input terminal. , And a receiving circuit for starting receiving the other of the distributed signals by the distributor.

  In the said one aspect | mode, the operation signal from the portable device in a keyless entry system can be received using a receiver. Since the receiving device is activated only when the portable device is operated, power consumption can be suppressed as compared with the conventional configuration in which the receiving IC is operated intermittently.

Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.
(Embodiment 1)
FIG. 1 is a block diagram illustrating a configuration of a receiving apparatus according to Embodiment 1. The receiving device 10 according to the first embodiment includes a distributor 11, a detector 12, a receiving IC 13, and a microcomputer (hereinafter referred to as a microcomputer) 14.

  The distributor 11 is connected to an antenna ANT that receives a signal transmitted by wireless communication, and distributes a signal input through the antenna ANT to the detector 12 and the receiving IC 13 at the subsequent stage.

  The detector 12 detects the signal input from the distributor 11 and outputs a detection signal to the reception IC 13. FIG. 2 is a circuit diagram showing a configuration example of the detector 12. The detector 12 is a diode detector, and includes a diode 121, a capacitor 122, and a switch 123. The anode of the diode 121 is connected to the input terminal 120a of the detector 12, and the high frequency signal distributed from the distributor 11 is input. The cathode of the diode 121 is connected to the output terminal 120 b of the detector 12.

  One end of the capacitor 122 is connected to the output terminal 120b of the detector 12, and the other end is connected to a reference potential (in the case of FIG. 2, ground potential). When the bias point of the detection signal is determined, a resistance element may be connected in parallel with the capacitor 122.

  The switch 123 is connected in parallel with the capacitor 122, one end of which is connected to the output terminal 120b of the detector 12, and the other end is connected to the reference potential (in the case of FIG. 2, the ground potential). The switch 123 is a switch that switches from an open state to a closed state when a reset signal is input from the microcomputer 14. When the switch 123 is closed, the output terminal 120b of the detector 12 is grounded, and the voltage level of the detection signal is reset.

  The reception IC 13 has an on / off control terminal 130 c connected to the output terminal 120 b of the detector 12. When a detection signal having a voltage level equal to or higher than the operating voltage Vth of the reception IC 13 is input to the on / off control terminal 130c, the reception IC 13 is configured to transition from the sleep state to the activation state. The receiving IC 13 starts the reception operation of the signal output from the distributor 11 after the transition to the activated state, receives the preamble indicating the start of the frame of the signal, and the data following the preamble, and obtains the data signal Is sent to the microcomputer 14.

  For this reason, in this embodiment, the diode 121 and the capacitor 122 are selected so that a detection signal having a voltage level equal to or higher than the operating voltage Vth of the reception IC 13 can be output from the detector 12.

  FIG. 3 is a circuit diagram showing a configuration example of the receiving IC 13. The reception IC 13 includes, for example, an LNA 131 (LNA: Low Noise Amplifier), a mixer 132, a band filter 133, an IF signal amplifier 134 (IF: Intermediate Frequency), and a demodulator 135.

  The LNA 131 is connected to the input terminal 130 a of the receiving IC 13, and receives a signal received by the antenna ANT and distributed by the distributor 11. The LNA 131 amplifies the input signal with low noise and outputs the amplified signal to the mixer 132. The mixer 132 mixes the signal amplified by the LNA 131 and the signal having an appropriate frequency to generate an intermediate frequency signal, that is, an IF signal.

  The band filter 133 is realized by any one or a combination of a low pass filter (LPF) and a band pass filter (BPF), and extracts a signal corresponding to a desired channel from the IF signal input through the mixer 132.

  IF signal amplifier 134 amplifies the signal output from band filter 133 with a gain corresponding to the external control signal, and outputs the amplified signal to demodulator 135. The external control signal is supplied from the demodulator 135, for example, and adjusted to the IF output amplitude required by the demodulator 135.

  The demodulator 135 converts the signal amplified by the IF signal amplifier 134 into a digital signal, and demodulates the converted digital signal to generate a data signal. The demodulator 135 outputs the generated data signal to the microcomputer 14 from the output terminal 130b of the reception IC 13.

  The microcomputer 14 itself is configured to transition from the sleep state to the activated state after the reception IC 13 transits to the activated state. The microcomputer 14 receives the data signal sent from the receiving IC 13 after the transition to the activated state, and performs processing based on the received data signal. The processing executed by the microcomputer 14 is arbitrary. For example, processing for performing various calculations based on the received data signal, processing for controlling various devices connected to the microcomputer 14, and communication with various devices connected to the microcomputer 14 It may be a process or the like. Moreover, the microcomputer 14 outputs a reset signal to the detector 12 in order to reset the voltage level of the detection signal output from the detector 12 when the reception of the data signal transmitted from the reception IC 13 is completed.

Hereinafter, the operation of receiving apparatus 10 according to the present embodiment will be described.
FIG. 4 is an explanatory diagram for explaining the operation of the receiving apparatus 10. A reception signal received through the antenna ANT of the reception device 10 is composed of an appropriate bit string, and includes a preamble indicating the start of a frame and a data portion indicating substantial data following the preamble.

  The detector 12 detects a reception signal input through the distributor 11 and outputs a detection signal through the output terminal 120b. At this time, the voltage level of the detection signal output from the detector 12 increases to an upper limit value according to the reception time of the preamble.

  The receiving IC 13 is configured to start when the voltage level of the detection signal input through the on / off control terminal 130c is equal to or higher than the operating voltage Vth of the receiving IC 13, and to stop starting when the voltage level is lower than the operating voltage Vth. . For example, if the reception time at the beginning of the preamble is T1, the voltage level of the detection signal output from the detector 12 at this timing has not reached the operating voltage Vth, so that the reception IC 13 is in a stopped state (sleep state) )It is in. When the preamble is further received and the voltage level of the detection signal output from the detector 12 reaches the operating voltage Vth at time T2, the receiving IC 13 is activated and starts receiving the signal input through the distributor 11. .

  The reception IC 13 starts a reception operation to amplify and demodulate a signal input through the distributor 11, generate a digital data signal corresponding to the data portion of the reception signal, and output the data signal to the microcomputer 14. .

  The microcomputer 14 performs switch control when receiving a data signal from the receiving IC 13. Specifically, the microcomputer 14 outputs a reset signal in order to keep the switch 123 of the detector 12 closed for a certain time (T4-T3). Due to the reset signal from the microcomputer 14, the switch 123 of the detector 12 is closed, the output terminal 120b of the detector 12 is grounded, and the voltage level of the detection signal is reset.

  As described above, in the present embodiment, since the reception IC 13 is activated at the timing when a signal is received by the antenna ANT, power consumption can be suppressed as compared with the conventional configuration in which the reception IC is intermittently operated.

  In the present embodiment, when the reception of the data signal is completed, a reset signal is output from the microcomputer 14 to the detector 12. However, the reception IC 13 determines the reception completion of the data signal, A configuration may be adopted in which a reset signal is output from the reception IC 13 to the detector 12 when it is determined that reception has been completed.

(Embodiment 2)
In the second embodiment, a configuration in which a band-pass filter is interposed between the antenna ANT and the distributor 11 of the receiving device 10 will be described.

  FIG. 5 is a block diagram illustrating a configuration of a receiving apparatus according to the second embodiment. Similarly to the first embodiment, the receiving apparatus 10 according to the embodiment includes a distributor 11, a detector 12, a receiving IC 13, and a microcomputer 14, and is further interposed between the antenna ANT and the distributor 11. A band filter 15 is provided.

  The band filter 15 is realized by one or a combination of a low pass filter (LPF) and a band pass filter (BPF), and inputs a signal corresponding to a desired frequency band from a signal input through the antenna ANT to the distributor 11. To do.

  As described above, in the second embodiment, by passing only a signal corresponding to a desired frequency band, it is possible to suppress input to the detector 12 and prevent the receiving IC 13 from being inadvertently activated. .

  In the present embodiment, the band filter 15 is provided between the antenna ANT and the distributor 11 of the receiving apparatus 10. However, the antenna ANT is a narrow band antenna, so that it corresponds to a desired frequency band. The signal may be input to the distributor 11.

(Embodiment 3)
In the third embodiment, a configuration for receiving an operation signal from a portable device in a keyless entry system using the receiving device 10 will be described.

  FIG. 6 is a schematic diagram illustrating a schematic configuration of the door lock system according to the present embodiment. The door lock system according to Embodiment 1 is a system for locking or unlocking a plurality of doors (hereinafter also referred to as vehicle doors) provided in the vehicle C, and includes a receiving device 10 and a body ECU provided in the vehicle C. (Electronic Control Unit) 21, a door lock mechanism 22, and a portable device 30 operated by a user.

  The portable device 30 includes a lock button and an unlock button in order to accept a user operation related to locking and unlocking the vehicle door. When the portable device 30 accepts a user operation related to locking or unlocking the vehicle door using the lock button or the unlock button, the portable device 30 transmits an operation signal in the RF band instructing locking or unlocking of the vehicle door.

  The receiving device 10 is connected to the antenna ANT in order to receive an operation signal transmitted from the portable device 30. The antenna ANT is, for example, an RF antenna that receives a signal having a frequency of an RF band (RF: Radio Frequency). The internal configuration of receiving apparatus 10 is exactly the same as that shown in the first or second embodiment.

  The body ECU 21 is connected to the receiving device 10 via a CAN bus (CAN: Controller Area Network), an in-vehicle LAN (LAN: Local Area Network), and the like, and receives a control signal output from the microcomputer 14 of the receiving device 10. Then, control related to locking and unlocking of the vehicle door is performed.

  The door lock mechanism 22 includes a mechanical mechanism for locking or unlocking each door of the vehicle C, an actuator for electrically operating the mechanical mechanism, and the like.

  For example, when a mechanical key (not shown) of the vehicle C is inserted into a key cylinder provided on the door of the vehicle C and a locking operation or an unlocking operation is performed, the door lock mechanism 22 operates an actuator or the like, Lock or unlock the door. At this time, information indicating that the key cylinder is operated by the mechanical key is output from the body ECU 21 to the door lock mechanism 22, and the door lock mechanism 22 is configured to operate based on the output information.

  Further, the body ECU 21 can be configured to lock or unlock the door by wireless communication between the body ECU 21 and the portable device 30. Specifically, when the operation signal from the portable device 30 is received by the antenna ANT of the receiving device 10, the body ECU 21 locks or unlocks the door based on the information related to locking or unlocking included in the received operation signal. Do the lock.

  As described above, in the third embodiment, the reception device 10 can be used to receive an operation signal from the portable device 30 in the keyless entry system. Since the receiving device 10 is activated only when the portable device 30 is operated, power consumption can be suppressed as compared with the conventional configuration in which the receiving IC is operated intermittently.

  In the third embodiment, the form in which the receiving apparatus of the present application is applied to a keyless entry system has been described. However, even if the receiving apparatus of the present application is applied to a wireless communication system for vehicles such as a smart entry system and a tire pressure monitoring system. Good.

  The embodiment disclosed this time is to be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 10 Receiver 11 Distributor 12 Detector 13 Receiver IC
14 microcomputer 120a input terminal 120b output terminal 121 diode 122 capacitor 123 switch 130a input terminal 130b output terminal 130c ON / OFF control terminal 131 LNA
132 Mixer 133 Band Filter 134 IF Signal Amplifier 135 Demodulator

Claims (6)

In a receiving apparatus that is connected to an antenna that receives a signal transmitted by wireless communication and that processes a signal input through the antenna,
A distributor for distributing a signal input through the antenna;
A detector that detects one of the signals distributed by the distributor and outputs a detection signal;
And having an input terminal to which a detection signal from the detector is input, and is activated when a detection signal from the detector having a voltage level equal to or higher than a threshold level is input through the input terminal, and the distribution And a receiving circuit that starts receiving the other of the signals distributed by the receiver. The detector includes a switch for resetting a voltage level of a detection signal to be output,
The receiving apparatus according to claim 1, further comprising: a control circuit that outputs a control signal for operating the switch to the detector when reception of a signal from the distributor is completed. The signal received through the antenna includes a preamble indicating the start of a frame, and a data part following the preamble,
The detector is
The receiving apparatus according to claim 1, wherein the voltage level is adjusted so that a voltage level of a detection signal output during reception of the preamble is equal to or higher than the threshold level. The receiving device according to any one of claims 1 to 3, wherein the antenna is a narrowband antenna that receives radio waves in a specific frequency band. The receiving device according to any one of claims 1 to 4, further comprising: a band filter that allows a signal in a specific frequency band to pass between the antenna and the distributor. A portable device that includes an operation unit that accepts an operation related to locking or unlocking a door provided in the vehicle, and that transmits an operation signal when the operation is accepted by the operation unit, and an operation transmitted from the portable device A vehicle door locking system including a receiving unit that receives a signal through an antenna, and an in-vehicle control device that performs control related to locking or unlocking of the door based on an operation signal received by the receiving unit,
The receiver is
A distributor for distributing a signal input through the antenna;
A detector that detects one of the signals distributed by the distributor and outputs a detection signal;
And having an input terminal to which a detection signal from the detector is input, and is activated when a detection signal from the detector having a voltage level equal to or higher than a threshold level is input through the input terminal, and the distribution A vehicle door locking system comprising: a receiving circuit that starts receiving the other of the signals distributed by the device.

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