JP2009253688A - Keyless system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a keyless system for vehicle with which devices can be normally operated by suppressing a transmission signal from a mobile unit from being interfered with a disturbance wave, and improving a probability for an in-vehicle unit to receive a transmission signal from the portable unit. <P>SOLUTION: A keyless system for vehicle controls devices of a vehicle through communications between a portable unit and an in-vehicle unit, wherein the portable unit comprises a frequency switching means for switching the frequency of a signal to be transmitted from the portable unit to the in-vehicle unit to a plurality of frequencies, and the in-vehicle unit comprises: a base station communication means for communicating with a base station having information about an interference wave area wherein an interference wave is being generated with respect to a transmission signal transmitted by the portable unit; a location detecting means for detecting the location of an own vehicle; an interference wave deciding means for deciding that the location of the own vehicle is included in the interference wave area, on the basis of the information about the interference wave area and information about the location of the own vehicle; and a frequency switching command means for commanding the portable unit to switch the frequency of the transmission signal in a case where the location of the own vehicle is included in the interference wave area. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention belongs to the technical field of a vehicle keyless device in which a vehicle body receiver receives a signal transmitted from a portable device and locks / unlocks a vehicle door and starts an engine.

As this type of technology, the technology described in Patent Document 1 is disclosed. In this publication, in the smart keyless device for a vehicle, the vehicle-mounted device transmits the request signal while avoiding the timing at which the carrier frequency of the AM amplifier digital amplifier matches the frequency of the request signal transmitted by the vehicle-mounted device. Are disclosed. Thereby, the transmitter carried by the driver or the like can receive the request signal without interference with noise caused by the carrier frequency.
JP 2006-96149 A

  However, in the above prior art, when the signal transmitted from the portable device (transmitter) to the on-vehicle device interferes with the interference wave (noise), the on-vehicle device (on-vehicle device) cannot receive the signal from the portable device. May not work properly. In addition, since the frequency band used by the portable device is used for various purposes, radio waves transmitted by devices outside the vehicle can become interference waves, and the frequency of the transmission signal of the portable device matches the frequency of the interference waves. It was difficult to avoid timing.

  The present invention has been made paying attention to the above-mentioned problem, and the object is to suppress the interference between the transmission signal from the portable device and the interference wave, and the probability that the in-vehicle device receives the transmission signal from the portable device. And providing a keyless device for a vehicle in which the device can operate normally.

  In order to achieve the above object, in the vehicle keyless device of the present invention, in the vehicle keyless device that controls the vehicle device by communication between the portable device and the vehicle-mounted device, the portable device includes the portable device. Frequency switching means for switching a frequency of a signal to be transmitted to the in-vehicle device to a plurality of frequencies, and a base station having information on an interference wave region where an interference wave of the transmission signal to be transmitted by the portable device is generated in the in-vehicle device. Based on the base station communication means for communicating with, the position detection means for detecting the position of the own vehicle, the information on the disturbing wave area and the information on the position of the own vehicle, the position of the own vehicle is the jamming wave area. An interference wave determining means for determining that the frequency of the transmission signal is instructed to switch the frequency of the transmission signal to the portable device when the position of the vehicle is in the interference wave area. .

  Therefore, it can suppress that onboard equipment cannot receive a reply signal by interference with a reply signal and noise, and a device can operate normally.

  Hereinafter, the best mode for realizing the vehicular keyless device of the present invention will be described based on the first to third embodiments.

First, the configuration of the vehicle keyless device according to the first embodiment will be described.
The keyless device for a vehicle according to the first embodiment mainly has a door lock function and an engine start function. These functions are executed by communication between the in-vehicle device 10 and the portable device 30. Further, a base station 40 is provided outside, and the base station 40 has an interference wave map indicating an interference wave area of a frequency used for signal transmission from the portable device 30 to the in-vehicle device 10. Sending the map.

[Configuration of in-vehicle device]
FIG. 1 is a configuration diagram of the in-vehicle device 10.
The in-vehicle device 10 includes a portable device receiving antenna 11 that receives a signal from the portable device 30, a portable device receiver 12 that processes the received signal, a GPS antenna 13 that receives a signal from GPS, and a signal from the GPS. A GPS receiver 14 for processing, a battery 15 for supplying current, an ignition switch 16 for starting the engine, a door switch 17 that is turned on and off by opening and closing the door, and a mobile phone that processes signals to the portable device 30 An in-vehicle portable device transmitting antenna 19, an out-of-vehicle portable device transmitting antenna 20, a communication module 21 performing bidirectional communication with the base station 40, etc., and an in-vehicle electrical unit, It has in-vehicle LAN 22 which communicates, and the control part 23 which calculates the control signal to each apparatus.

An RF wave signal is transmitted from the portable device 30. The portable device receiving antenna 11 is an RF wave antenna that receives this RF wave signal. The received RF wave signal is input to the portable device receiver 12, and the portable device receiver 12 processes the RF wave signal to extract a signal from the portable device 30 and outputs the processed signal to the controller 23.
The GPS signal received by the GPS antenna 13 is input to the GPS receiver 14. The GPS receiver 14 processes the GPS signal and outputs a signal from the GPS to the controller 23 as position information of the host vehicle.

The ignition switch 16 starts the engine in the on state and stops the engine in the off state. On / off information of the ignition switch 16 is input to the control unit 23.
The door switch 17 is a switch that is turned on when the door is open and turned off when the door is closed. On / off information of the door switch 17 is input to the control unit 23.

The portable device transmission unit 18 creates an LF wave signal based on a command from the control unit 23 and transmits the LF wave signal from the in-vehicle portable device transmission antenna 19 and the out-of-vehicle portable device transmission antenna 20. The in-vehicle portable device transmission antenna 19 mainly transmits signals to the portable device 30 in the vehicle, and the out-of-vehicle portable device transmission antenna 20 mainly transmits signals to the portable device 30 outside the vehicle.
The communication module 21 is a medium to long distance bidirectional communication module such as a mobile communication terminal or a wireless LAN communication module. Signals are transmitted and received between the in-vehicle device 10 and the base station 40 using the communication module 21.
The in-vehicle LAN 22 is a wired line for bidirectional communication with an electrical unit such as an engine control unit or navigation.

FIG. 2 is a control block diagram of the control unit 23 of the in-vehicle device 10.
The control unit 23 includes a portable device position determination unit 23 a that determines the position of the portable device 30, and an interference wave region map holding unit that holds an interference wave region map in which an interference wave of a transmission signal transmitted by the portable device 30 is generated. 23b, an interference wave area determination unit 23c for determining whether the position of the host vehicle is an interference wave area, a frequency switching command unit 23d for instructing the portable device 30 to perform frequency switching, and an own vehicle for calculating the position of the host vehicle A position calculation unit 23e, an electric field strength calculation unit 23f that calculates the electric field strength of the RF wave signal, an interference wave information creation unit 23g that generates interference wave information including the electric field strength of the interference wave and the vehicle position, A portable device ID determining unit 23h that determines a portable device ID from a transmission signal from the portable device 30, a door lock opening / closing command unit 23i that instructs opening / closing of the door lock based on the transmission signal from the portable device 30, and starting the engine line And a engine start command unit 23j.

  The portable device position determination unit 23a inputs switch on / off information from the door switch 17, detects that the door switch 17 is switched from off to on, and from on to off, and determines whether the door is opened or closed. It is determined that the portable device 30 has moved from the inside of the vehicle to the outside of the vehicle or moved from the outside of the vehicle to the inside of the vehicle by opening and closing the door.

The jamming wave area map holding unit 23b receives the jamming wave area map received by the communication module 21, and stores the jamming wave area map.
Here, the jamming wave region indicates a region where the frequency of the transmission signal transmitted by the portable device 30 is the same and a radio wave having an electric field strength larger than a threshold is generated. In the first embodiment, the portable device 30 can switch between the frequency f1 and the frequency f2, and uses a radio wave having the frequency f1 or the frequency f2 and having an electric field strength larger than the threshold A as an interference wave.

  The jamming wave area determination unit 23c inputs the jamming wave area map information from the jamming wave area map holding unit 23b and the host vehicle position information from the host vehicle position calculation unit 23e described later, and the host vehicle position is in the jamming wave area. Determine whether or not.

In the frequency switching command unit 23d, portable device position information from the portable device position determination unit 23a and information on whether or not the vehicle is in the disturbance wave region are input from the interference wave region determination unit 23c, and the portable device 30 transmits the information. A command for switching the frequency of the transmission signal to be transmitted is output via the portable device transmitter 18.
The own vehicle position calculation unit 23e inputs transmission information from the GPS from the GPS reception unit 14, and calculates the position of the own vehicle based on the transmission information.

  The electric field strength calculation unit 23f receives the signal processed in the portable device reception unit 12, and calculates the electric field strength of this signal. The electric field strength calculation unit 23f calculates the electric field strength of the interference wave that causes interference when the frequency matches the transmission signal transmitted by the portable device 30.

  The disturbing wave information creating unit 23g receives the position information of the own vehicle from the own vehicle position calculating unit 23e and the electric field strength information of the disturbing wave from the electric field strength calculating unit 23f, and creates disturbing wave information at the position of the own vehicle. . This interference wave information is transmitted to the base station 40 via the communication module 21.

  The portable device ID determination unit 23h inputs the transmission signal of the portable device 30 processed by the portable device receiver 12, and determines whether the ID of the portable device 30 is approved or not. The ID of the portable device 30 is identification data assigned to each portable device 30, and the ID is determined to be approved if the portable device 30 of the host vehicle is used, and is not approved if the portable device 30 is another vehicle. ing.

When the approval signal from the portable device ID determining unit 23h is input to the door lock opening / closing command unit 23i and it is determined that the portable device 30 is within a predetermined range of the vehicle, the door lock opening / closing command unit 23i issues a command to release the door lock. To the door lock control unit.
The engine start command unit 23j starts the engine when an approval signal is input from the portable device ID determination unit 23h and a signal indicating that an engine start switch 33 (described later) is operated is input from the portable device 30. The command is output to the engine controller via the in-vehicle LAN 22.

[Configuration of portable device]
FIG. 3 is a configuration diagram of the portable device 30.
The portable device 30 includes a vehicle-mounted device receiving antenna 31 that receives a signal from the vehicle-mounted device 10, a vehicle-mounted device receiving unit 32 that processes the received signal, an engine start switch 33 that is operated by a driver, a door lock switch 37, and the like. The vehicle-mounted device transmitting unit 34 that processes the signal to the vehicle-mounted device 10, the vehicle-mounted device transmission antenna 35 that transmits the signal to the vehicle-mounted device 10, and the control unit 36 that calculates the control signal to each device.

The in-vehicle device receiving antenna 31 is an LF wave antenna that receives an LF wave signal transmitted by the in-vehicle device 10. The received LF wave signal is input to the in-vehicle device receiver 32, and the in-vehicle device receiver 32 processes the LF wave to extract a signal from the in-vehicle device 10 and outputs the processed signal to the control unit 36.
The engine start switch 33 and the door lock switch 37 are operated by the driver and output an operation signal to the control unit 36.
The in-vehicle device transmission unit 34 creates an RF wave signal based on a command from the control unit 36, and transmits this RF wave signal from the in-vehicle device transmission antenna 35.

FIG. 4 is a control block diagram of the control unit 36 of the portable device 30.
The control unit 36 includes a frequency switching unit 36a that switches the frequency of the RF wave signal to be transmitted, a door lock opening / closing command unit 36b that opens and closes the door lock of the vehicle, and an engine start command unit 36c that starts the engine.

The frequency switching unit 36a inputs the signal processed in the in-vehicle device receiving unit 32, and when the frequency switching command signal from the frequency switching command unit 23d of the in-vehicle device 10 is input, the frequency of the RF wave signal to be transmitted. Switch.
When the door lock opening / closing command unit 36b receives, for example, a portable device search signal from the vehicle-mounted device 10 from the vehicle-mounted device reception unit 32, or when operation information of the door lock switch 37 is input, the door lock opening / closing command unit 36b The door unlock signal is output with ID information via the machine transmitter 34.

  When the operation information of the engine start switch 33 is input by the driver's operation, the engine start command unit 36c outputs an engine start signal with ID information to the in-vehicle device 10 via the in-vehicle device transmission unit 34. To do.

[Base station configuration]
FIG. 5 is a configuration diagram of the base station 40.
The base station 40 includes a communication module 41 that performs two-way communication with the in-vehicle device 10, and a control unit 42 that calculates an interference wave area map from information from the in-vehicle device 10.

  The communication module 41 is a medium to long distance bidirectional communication module such as a communication terminal or a wireless LAN communication module that can communicate with a mobile communication terminal mounted on the in-vehicle device 10. Signals are transmitted and received between the in-vehicle device 10 and the base station 40 using the communication module 41.

FIG. 6 is a control block diagram of the control unit 42 of the base station 40.
The control unit 42 includes an interference wave area information creation unit 42a and an interference wave area map holding unit 42b.

The interference wave area information creation unit 42a inputs the field intensity information of the interference wave and the position information of each vehicle from each in-vehicle device 10 mounted on a plurality of vehicles, and creates an interference wave area map. This jamming wave area map is output to the jamming wave area map holding unit 42b.
The jamming wave area map holding unit 42 b transmits the jamming wave area map held in each in-vehicle device 10 via the communication module 41.

[Interference wave information transmission processing]
FIG. 7 is a flowchart showing the flow of interference wave information transmission processing performed in the interference wave information creating unit 23g.

In step S10, the electric field intensity information of the interference wave is acquired from the electric field intensity calculation unit 23f, and the process proceeds to step S11.
In step S11, the position information of the own vehicle is acquired from the own vehicle position calculation unit 23e, and the process proceeds to step S12.

In step S12, it is determined whether or not an interfering wave having an electric field strength greater than threshold A has been received for a predetermined time. If an interfering wave having an electric field strength greater than threshold A is received for a predetermined time, the process proceeds to step S13. If no disturbing wave having a larger electric field strength has been received for a predetermined time, the process returns to step S10. FIG. 8 is a table showing the relationship between the input level of the received RF wave signal and the electric field strength, where the vertical axis represents the electric field strength and the horizontal axis represents the input level. As shown in FIG. 8, the threshold A is set to a value larger than the white noise level.
In step S <b> 13, the electric field strength information of the jamming wave and the own vehicle position information are transmitted to the base station 40 via the communication module 41.

[Frequency switching process]
FIG. 9 is a flowchart showing a flow of frequency switching processing performed in the interference wave area determination unit 23c and the frequency switching command unit 23d.

In step S20, an interference wave area map is acquired from the interference wave area map holding unit 23b, and the process proceeds to step S21.
In step S21, the host vehicle position information is acquired from the host vehicle position calculation unit 23e, and the process proceeds to step S22.

In step S22, the vehicle position is compared with the disturbance wave area map, and the process proceeds to step S23.
In step S23, it is determined whether or not the current position of the host vehicle is in the disturbing wave area. If it is in the disturbing wave area, the process proceeds to step S24. If not, the process returns to step S22.

In step S24, it is determined whether or not the area is an interference wave area having the frequency f1, and if the area is the interference wave area having the frequency f1, the process proceeds to step S25. If the area is not the interference wave area having the frequency f1, the process proceeds to step S28. To do.
In step S25, it is determined whether or not the area is an interference wave area of frequency f2. If the area is an interference wave area of frequency f2, the process proceeds to step S26. If the area is not an interference wave area of frequency f2, the process proceeds to step S27. To do.

  In step S26, it is determined whether or not the electric field strength of the disturbance wave having the frequency f1 is greater than the electric field strength of the interference wave having the frequency f2. If the electric field strength of the disturbing wave with the frequency f1 is larger than the electric field strength of the disturbing wave with the frequency f2, the process proceeds to step S27. Proceeds to step S28.

In step S27, a switching command for switching the transmission signal to the frequency f2 is output to the portable device 30, and the process ends.
In step S28, a switching command for switching the transmission signal to the frequency f1 is output to the portable device 30, and the process is terminated.

[Action]
[Outline of vehicle keyless device]
In the door lock function, when the driver with the portable device 30 gets off the vehicle and leaves the vehicle, the portable device 30 is outside the transmission range of the in-vehicle portable device transmission antenna 20 of the in-vehicle device 10 and the door is locked. On the other hand, when the driver approaches the vehicle to get on, the portable device 30 is within the transmission range of the in-vehicle portable device transmission antenna 20 of the in-vehicle device 10 and the door lock is released. Further, when the portable device 30 is within the transmission range of the vehicle-mounted portable device transmission antenna 20 of the in-vehicle device 10 and the driver operates the door lock switch 37 of the portable device 30, the door lock is released.

  When the driver with the portable device 30 is in the engine starting function, the portable device 30 is within the search range of the in-vehicle portable device transmission antenna 19 of the in-vehicle device 10 and the engine is operated when the ignition switch 16 is operated. Starts. On the other hand, when the driver gets off the vehicle and is outside the vehicle, the portable device 30 is outside the search range of the vehicle-mounted portable device transmitting antenna 20 of the vehicle-mounted device 10, and the engine does not start even if the ignition switch 16 is operated. Further, when the portable device 30 is within the transmission range of the vehicle-mounted portable device transmitting antenna 20 of the in-vehicle device 10 and the driver operates the engine start switch 33 of the portable device 30, the engine is started.

[Transmission signal frequency switching for portable devices]
In the vehicle keyless device according to the first embodiment, an RF wave signal is used as a signal transmitted by the portable device 30. The frequency band of the RF wave signal is used in various communication devices. In particular, the radio waves around the radio tower and the antenna base station have high electric field strength, and signals from other communication devices and transmission signals from the portable device 30 interfere with each other. There is a fear.

  When signals from other communication devices and transmission signals from the portable device 30 interfere with each other, the signal from the portable device 30 cannot be received by the in-vehicle device 10 and the door cannot be unlocked or the engine can be started. .

  Therefore, in the vehicle keyless device according to the first embodiment, the in-vehicle device 10 acquires the interference wave area map of the base station 40, and when the position of the host vehicle is, for example, the interference wave area of the frequency f1, the portable device 30 transmits the frequency f2. In order to send a signal with. And the portable device 30 was made to transmit a signal with the frequency f2 according to the command from the vehicle equipment 10.

FIG. 10 is a diagram showing a disturbance wave area map. FIG. 10 shows an interference wave area D1 having a frequency f1 and an interference wave area D2 having a frequency f2.
Each vehicle transmits the electric field strength information of the disturbing wave and the own vehicle position information to the base station 40. The base station 40 creates a jamming wave area map M (a jamming wave area map M1 or a jamming wave area map M2) from the electric field strength information of the jamming waves transmitted from each vehicle and the own vehicle position information. The interference wave area map M created by the base station 40 is transmitted to each vehicle.

  Each vehicle compares the disturbance wave area map M with the position of the own vehicle, and when the own vehicle is in the area D1, the in-vehicle device 10 instructs the portable device 30 to transmit at the frequency f2, The machine 30 transmits at the frequency f2. When the host vehicle is in the area D2, the in-vehicle device 10 instructs the portable device 30 to transmit at the frequency f1, and the portable device 30 transmits at the frequency f1.

  Therefore, the interference between the transmission signal of the portable device 30 and the interference wave is suppressed, the reception probability of the transmission signal from the portable device 30 in the in-vehicle device 10 is increased, and the malfunction of the door lock function or the engine start function is prevented. be able to.

  Further, in order for the portable device 30 to switch the frequency, it is necessary to drive the elements in the portable device 30 and consume electric power. Therefore, if the frequency is frequently switched, the power consumption of the portable device 30 increases.

  Therefore, in the first embodiment, transmission is performed at the frequency used in the jamming wave area even after the own vehicle passes through the jamming wave area. For example, when the own vehicle switches the frequency of the transmission signal to f2 in the disturbance wave area D1 having the frequency f1, transmission is performed at the frequency f2 even after passing through the disturbance wave area D1.

  Therefore, the frequency | count of frequency switching of the transmission signal in the portable device 30 can be suppressed, and the power consumption of the portable device 30 can be reduced.

When the own vehicle is in the interference wave region D3 where the interference wave region D1 having the frequency f1 and the interference wave region D2 having the frequency f2 overlap, the signal is transmitted using a frequency with a small electric field strength of the interference wave.
Therefore, the interference between the transmission signal of the portable device 30 and the interference wave is suppressed, the reception probability of the transmission signal from the portable device 30 in the in-vehicle device 10 is increased, and the malfunction of the door lock function or the engine start function is prevented. be able to.

[Effect of Example 1]
(1) In a vehicle keyless device that controls a device of a vehicle by communication between the portable device 30 and the in-vehicle device 10, a plurality of frequencies of signals transmitted from the portable device 30 to the in-vehicle device 10 are transmitted to the portable device 30. A communication module 21 that performs communication with the base station 40 that has information on a jamming wave area where a jamming wave of a transmission signal transmitted from the portable device 30 is generated in the vehicle-mounted device 10; Interference wave area determination for determining that the position of the own vehicle is an interference wave area based on the own vehicle position calculation unit 23e that detects the position of the own vehicle, and information on the interference wave area and information on the position of the own vehicle The unit 23c and a frequency switching command unit 23d that commands the portable device 30 to switch the frequency of the transmission signal when the position of the host vehicle is in the jamming wave area are provided.

  Therefore, the interference between the transmission signal of the portable device 30 and the interference wave is suppressed, the reception probability of the transmission signal from the portable device 30 in the in-vehicle device 10 is increased, and the malfunction of the door lock function or the engine start function is prevented. be able to.

(2) The frequency switching command unit 23d maintains the frequency of the transmission signal used in the jamming wave area when the position of the host vehicle is no longer in the jamming wave area.
Therefore, the frequency | count of frequency switching of the transmission signal in the portable device 30 can be suppressed, and the power consumption of the portable device 30 can be reduced.

  (3) The frequency switching command unit 23d instructs the portable device 30 to switch to the frequency of the jamming wave having the lowest electric field strength when the position of the host vehicle is in the jamming wave region having a plurality of frequencies.

  Therefore, the interference between the transmission signal of the portable device 30 and the interference wave is suppressed, the reception probability of the transmission signal from the portable device 30 in the in-vehicle device 10 is increased, and the malfunction of the door lock function or the engine start function is prevented. be able to.

The frequency switching command unit 23d of the vehicle keyless device according to the first embodiment outputs a frequency switching command when the jamming wave area determination unit 23c determines that the host vehicle is in the jamming wave area. On the other hand, in the frequency switching command unit 23d of the vehicle keyless device according to the second embodiment, the interference wave area determination unit 23c determines that the vehicle is in the interference wave area, and the portable device position determination unit 23a carries the mobile phone. A frequency switching command is output when it is determined that the machine 30 is outside the vehicle.
Hereinafter, although the keyless device for vehicles of Example 2 is explained, about the same composition as Example 1, the same numerals are attached and explanation is omitted.

[Interference wave information transmission processing]
FIG. 11 is a flowchart showing the flow of interference wave information transmission processing performed in the interference wave information creation unit 23g.

In step S30, the field intensity information of the disturbing wave received by the vehicle-mounted portable device transmitting antenna 20 is acquired from the field strength information of the disturbing wave from the field strength calculating unit 23f, and the process proceeds to step S31.
In step S31, the position information of the own vehicle is acquired from the own vehicle position calculation unit 23e, and the process proceeds to step S32.

In step S32, it is determined whether or not the in-vehicle portable device transmitting antenna 20 has received an interfering wave having an electric field strength greater than the threshold A for a predetermined time. The process proceeds to step S33, and if an interfering wave having an electric field strength greater than the threshold A has not been received for a predetermined time, the process returns to step S30.
In step S <b> 33, the electric field strength information of the disturbing wave and the own vehicle position information are transmitted to the base station 40 via the communication module 41.

[Frequency switching process]
FIG. 12 is a flowchart showing a flow of frequency switching processing performed in the portable device position determining unit 23a, the jamming wave region determining unit 23c, and the frequency switching command unit 23d.

In step S40, an interference wave area map is acquired from the interference wave area map holding unit 23b, and the process proceeds to step S41.
In step S41, the host vehicle position information is acquired from the host vehicle position calculation unit 23e, and the process proceeds to step S42.

In step S42, the vehicle position is compared with the disturbance wave area map, and the process proceeds to step S43.
In step S43, it is determined whether or not the current position of the host vehicle is in the disturbing wave area. If it is in the disturbing wave area, the process proceeds to step S44. If not, the process returns to step S42.

  In step S44, the portable device position determination unit 23a determines whether the door has been opened or closed. If the door is opened and closed, it is determined that the portable device 30 is outside the vehicle, and the process proceeds to step S45. If the door is not opened and closed, the portable device 30 is determined to be inside the vehicle and the process returns to step S42.

In step S45, it is determined whether or not the interference wave area is at the frequency f1, and if the interference wave area is at the frequency f1, the process proceeds to step S46. If not, the process proceeds to step S49. To do.
In step S46, it is determined whether or not the area is a disturbance wave area having the frequency f2. If the area is the disturbance wave area having the frequency f2, the process proceeds to step S47. If the area is not the disturbance wave area having the frequency f2, the process proceeds to step S48. To do.

  In step S47, it is determined whether or not the electric field strength of the disturbance wave having the frequency f1 is greater than the electric field strength of the interference wave having the frequency f2. If the electric field strength of the interference wave with the frequency f1 is larger than the electric field strength of the interference wave with the frequency f2, the process proceeds to step S48. Proceeds to step S49.

In step S48, a switching command for switching the transmission signal to the frequency f2 is output to the portable device 30, and the process ends.
In step S49, a switching command for switching the transmission signal to the frequency f1 is output to the portable device 30, and the process ends.

[Action]
Most of the vehicle is a space closed with metal, and when an interference wave is generated outside the vehicle, the electric field strength of the interference wave inside the vehicle is smaller than the electric field strength of the interference wave outside the vehicle. Further, when the portable device 30 is in the vehicle, the communication distance with the portable device receiving antenna 11 of the in-vehicle device 10 is also shortened, and the communication state is inclined in an advantageous direction. For this reason, communication between the portable device 30 and the vehicle-mounted device 10 is possible inside the vehicle even in the jamming wave region outside the vehicle.

  Further, in order for the portable device 30 to switch the frequency, it is necessary to drive the elements in the portable device 30 and consume electric power. Therefore, if the frequency is frequently switched, the power consumption of the portable device 30 increases.

  Therefore, in the second embodiment, the frequency switching command unit 23d outputs a command to switch the frequency to the portable device 30 when it is determined that the portable device 30 is outside the vehicle even when the host vehicle is in the interference wave area. I made it. On the other hand, when it is determined that the portable device 30 is in the vehicle even when the host vehicle is in the interference wave area, a command to switch the frequency is not output to the portable device 30.

  FIG. 13 is a diagram showing a disturbance wave area map. FIG. 13 shows an interference wave region D4 having a frequency f1 outside the vehicle.

  Each vehicle transmits the electric field strength information of the disturbing wave and the own vehicle position information to the base station 40. The base station 40 creates a disturbance wave area map outside the vehicle from the electric field strength information of the disturbance wave transmitted from each vehicle and the own vehicle position information. The interference wave area map created by the base station 40 is transmitted to each vehicle.

  In each vehicle, the jamming wave area map is compared with the position of the own vehicle. When the own vehicle is in the jamming wave area D3 and the portable device 30 is outside the vehicle, the in-vehicle device 10 transmits the frequency to the portable device 30. The portable device 30 is instructed to transmit at f2, and the portable device 30 transmits at the frequency f2. On the other hand, even when the vehicle is in the interference wave area D4, when the portable device 30 is in the vehicle, the in-vehicle device 10 does not transmit the frequency to the portable device 30, and the portable device 30 transmits at the frequency f1.

  Therefore, the frequency | count of frequency switching of the transmission signal in the portable device 30 can be suppressed, and the power consumption of the portable device 30 can be reduced.

  Whether the portable device 30 is outside the vehicle or inside the vehicle is determined by the electric field strength of the transmission signal of the portable device 30 received by the in-vehicle portable device receiving antenna 24 received by the in-vehicle device 10 and the reception of the portable device receiving antenna 25 outside the vehicle. This can be done by comparing the field strength of the transmission signal of the portable device 30. However, when the portable device 30 is outside the vehicle in the jamming wave area, the transmission signal of the portable device 30 cannot be received by the in-vehicle device 10, so the position of the portable device 30 cannot be determined.

Therefore, in the second embodiment, the opening / closing information of the door is input from the door switch 17 in the portable device position determination unit 23a, and the position of the portable device 30 is determined from the opening / closing information of the door.
Therefore, the position of the portable device 30 can be determined even in the jamming wave area.

[Effect of Example 2]
(4) The frequency switching command unit 23d includes a portable device position determination unit 23a that determines whether the portable device 30 is inside or outside the vehicle, and the position of the host vehicle is in the jamming wave area. When it is determined that the portable device 30 has moved from the inside of the vehicle to the outside of the vehicle, the portable device 30 is instructed to switch the frequency of the transmission signal.
Therefore, the frequency | count of frequency switching of the transmission signal in the portable device 30 can be suppressed, and the power consumption of the portable device 30 can be reduced.

(5) The portable device position determination unit 23a inputs door opening / closing information from the door switch 17 indicating the door open / close state, and determines that the portable device 30 is outside the vehicle when the door is opened / closed. .
Therefore, the position of the portable device 30 can be determined even in the jamming wave area.

In the frequency switching command unit 23d of the vehicle keyless device according to the second embodiment, the jammer area determination unit 23c determines that the host vehicle is in the jamming wave area, and the portable device position determination unit 23a performs the portable device 30. When it is determined that the vehicle is outside the vehicle, a frequency switching command is output. On the other hand, in the frequency switching command unit 23d of the vehicle keyless device according to the third embodiment, the interference wave area determination unit 23c determines that the host vehicle is in the interference wave area outside the vehicle, and the portable device position determination unit 23a. When it is determined that the portable device 30 is outside the vehicle, a frequency switching command is output. Further, when the own vehicle is in the jamming wave area in the vehicle in the jamming wave area determination unit 23c, the frequency switching command unit 23d is also used when the portable device position judgment unit 23a determines that the portable device 30 is in the car. Output frequency switching command.
Hereinafter, although the keyless device for vehicles of Example 2 is explained, about the same composition as Example 1, the same numerals are attached and explanation is omitted.

[Configuration of in-vehicle device]
FIG. 14 is a configuration diagram of the in-vehicle device 10. The in-vehicle device 10 includes an in-car portable device receiving antenna 24 and an in-car portable device receiving antenna 24.

  The in-vehicle portable device receiving antenna 24 is an RF wave antenna that receives an in-vehicle RF wave signal. The outside portable device receiving antenna 25 is an RF wave antenna that receives an RF wave signal outside the vehicle. The received RF wave signal is input to the portable device receiver 12, and the portable device receiver 12 processes the RF wave signal to extract a signal from the portable device 30 and outputs the processed signal to the controller 23.

  FIG. 15 is a control block diagram of the control unit 23 of the in-vehicle device 10. The portable device position determination unit 23a inputs switch on / off information from the ignition switch 16, detects that the ignition switch 16 is switched from off to on, and from on to off, and determines whether the engine is started or stopped. To do. When the engine is stopped, it is determined that the portable device 30 has moved from the inside of the vehicle to the outside of the vehicle.

[Interference wave information transmission processing]
FIG. 16 is a flowchart showing a flow of interference wave information transmission processing performed in the interference wave information creating unit 23g.

In step S50, the electric field strength information of the interfering wave received by the in-vehicle portable device receiving antenna 24 and the electric field strength information of the interfering wave received by the outside portable device receiving antenna 25 out of the electric field strength information of the interfering wave from the electric field strength calculating unit 23f. Is obtained, and the process proceeds to step S51.
In step S51, the position information of the own vehicle is acquired from the own vehicle position calculation unit 23e, and the process proceeds to step S52.

  In step S52, whether or not the in-car portable device receiving antenna 24 has received an interfering wave having an electric field strength greater than the threshold A for a predetermined time, and the in-vehicle mobile device receiving antenna 25 applies an interfering wave having an electric field strength greater than the threshold B for a predetermined time. It is determined whether or not it has been received. If the in-vehicle portable device receiving antenna 24 has received an interfering wave having an electric field strength greater than the threshold A for a predetermined time, or the in-vehicle mobile device receiving antenna 25 has received an interfering wave having an electric field strength greater than the threshold B for a predetermined time. The process proceeds to S53. The in-vehicle portable device receiving antenna 24 did not receive an interfering wave having an electric field strength greater than the threshold A for a predetermined time, and the in-vehicle portable device receiving antenna 25 did not receive an interfering wave having an electric field strength greater than the threshold B for a predetermined time. If so, the process returns to step S50.

FIG. 17 is a table showing the relationship between the input level of the received RF wave signal and the electric field strength, where the vertical axis represents the electric field strength and the horizontal axis represents the input level. As shown in FIG. 16, the threshold A and the threshold B are values larger than the white noise level, and the threshold B is set to a value larger than the threshold A.
In step S <b> 53, the electric field strength information of the disturbing wave and the own vehicle position information are transmitted to the base station 40 via the communication module 21.

[Frequency switching process]
FIG. 18 is a flowchart showing a flow of frequency switching processing performed in the portable device position determining unit 23a, the jamming wave region determining unit 23c, and the frequency switching command unit 23d.

In step S60, an interference wave area map is acquired from the interference wave area map holding unit 23b, and the process proceeds to step S61.
In step S61, own vehicle position information is acquired from the own vehicle position calculation unit 23e, and the process proceeds to step S62.

In step S62, the host vehicle position is compared with the disturbance wave area map, and the process proceeds to step S63.
In step S63, it is determined whether or not the current position of the host vehicle is in the outside disturbance area. If it is in the outside disturbance area, the process proceeds to step S64. If not, the process returns to step S62.

  In step S64, it is determined whether or not the current position of the host vehicle is in the in-vehicle disturbance area. If it is in the in-vehicle disturbance area, the process proceeds to step S65. If not, the process proceeds to step S66. To do.

  In step S65, the portable device position determination unit 23a determines whether or not the ignition switch 16 has been turned off. When the ignition switch 16 is turned off from on, it is determined that the portable device 30 is outside the vehicle, and the process proceeds to step S64. When the ignition switch 16 is not turned off from on, the portable device 30 is in the vehicle. It is determined that there is, and the process returns to step S62.

In step S66, it is determined whether or not the area is a disturbance wave area having the frequency f1, and if the area is the disturbance wave area having the frequency f1, the process proceeds to step S67. If not, the process proceeds to step S70. .
In step S67, it is determined whether or not the area is an interference wave area of frequency f2. If the area is an interference wave area of frequency f2, the process proceeds to step S68. If the area is not an interference wave area of frequency f2, the process proceeds to step S69. To do.

  In step S68, it is determined whether or not the electric field strength of the disturbing wave having the frequency f1 is greater than the electric field strength of the disturbing wave having the frequency f2. If the electric field strength of the disturbing wave with the frequency f1 is larger than the electric field strength of the disturbing wave with the frequency f2, the process proceeds to step S69. Proceeds to step S70.

In step S69, a switching command for switching the transmission signal to the frequency f2 is output to the portable device 30, and the process ends.
In step S70, a switching command for switching the transmission signal to the frequency f1 is output to the portable device 30, and the process is terminated.

[Action]
Most of the vehicle is a space closed with metal, and when an interference wave is generated outside the vehicle, the electric field strength of the interference wave inside the vehicle is smaller than the electric field strength of the interference wave outside the vehicle. Further, when the portable device 30 is in the vehicle, the communication distance with the portable device receiving antenna 11 of the in-vehicle device 10 is also shortened, and the communication state is inclined in an advantageous direction. For this reason, communication between the portable device 30 and the vehicle-mounted device 10 is possible inside the vehicle even in the jamming wave region outside the vehicle. However, in a region where the electric field strength of the disturbing wave is high, the frequency needs to be switched because the electric field strength of the disturbing wave in the vehicle is also high.

  Further, in order for the portable device 30 to switch the frequency, it is necessary to drive the elements in the portable device 30 and consume electric power. Therefore, if the frequency is frequently switched, the power consumption of the portable device 30 increases.

  Therefore, in the third embodiment, the frequency switching command unit 23d determines that the host vehicle is in the outside disturbance area and the portable device 30 is determined to be outside the vehicle, or the own vehicle is in the outside disturbance area. In this case, a command for switching the frequency is output to the portable device 30. On the other hand, when it is determined that the portable device 30 is inside the vehicle even when the host vehicle is in the outside disturbance area, the command for switching the frequency is not output to the portable device 30.

  FIG. 19 is a diagram showing an interference wave area map. FIG. 19 shows an outside jamming wave area D5 and an inside car jamming wave area D6 of the frequency f1 outside the vehicle.

  Each vehicle transmits the electric field strength information of the disturbing wave and the own vehicle position information to the base station 40. The base station 40 creates an out-of-vehicle interference wave area map and an in-vehicle interference wave area map from the electric field strength information of the interference wave transmitted from each vehicle and the own vehicle position information. The interference wave area map created by the base station 40 is transmitted to each vehicle.

  In each vehicle, the jamming area map is compared with the position of the own vehicle. When the own vehicle is in the outside jamming area D5 and the portable device 30 is outside the vehicle, the in-vehicle device 10 is connected to the portable device 30. The mobile device 30 is instructed to transmit at the frequency f2, and the portable device 30 transmits at the frequency f2. On the other hand, when the mobile device 30 is in the vehicle even when the host vehicle is in the interference wave area D5, the in-vehicle device 10 does not transmit the frequency to the mobile device 30, and the mobile device 30 transmits at the frequency f1. . In addition, when the host vehicle is in the in-vehicle disturbance area D6, the in-vehicle device 10 instructs the portable device 30 to transmit at the frequency f2 regardless of the position of the portable device 30, and the portable device 30 uses the frequency f2. Send.

  Therefore, the frequency | count of frequency switching of the transmission signal in the portable device 30 can be suppressed, suppressing the interference of the transmission signal and interference wave of the portable device 30, and the power consumption of the portable device 30 can be reduced.

  Whether the portable device 30 is outside the vehicle or inside the vehicle is determined by the electric field strength of the transmission signal of the portable device 30 received by the in-vehicle portable device receiving antenna 24 received by the in-vehicle device 10 and the reception of the portable device receiving antenna 25 outside the vehicle. This can be done by comparing the field strength of the transmission signal of the portable device 30. However, when the portable device 30 is outside the vehicle in the jamming wave area, the transmission signal of the portable device 30 cannot be received by the in-vehicle device 10, so the position of the portable device 30 cannot be determined.

Therefore, in the third embodiment, the portable device position determination unit 23a inputs engine start / stop information from the ignition switch 16, and determines the position of the portable device 30 from the engine start / stop information.
Therefore, the position of the portable device 30 can be determined even in the jamming wave area.

[Effect of Example 3]
(6) The base station 40 has, as information on the jamming area, information on the jamming area outside the vehicle where the jamming wave is generated outside the vehicle and information on the jamming area where the jamming wave is generated inside the car. Then, the jamming wave area determination unit 23c determines that the position of the host vehicle is the car jamming area or the car jamming area based on the information on the car jamming area and the information on the car jamming area, The frequency switching command unit 23d has a portable device position determination unit 23a that determines whether the portable device 30 is in the vehicle or outside the vehicle, and the position of the host vehicle is in the vehicle outside interference wave area and not in the vehicle interference wave area. Thus, when it is determined that the portable device 30 has moved from the inside of the vehicle to the outside of the vehicle, the transmitter is instructed to switch the frequency of the transmission signal.

    Therefore, the frequency | count of frequency switching of the transmission signal in the portable device 30 can be suppressed, suppressing the interference of the transmission signal and interference wave of the portable device 30, and the power consumption of the portable device 30 can be reduced.

(7) The portable device position determination unit 23a inputs switch on / off information from the ignition switch 16, and determines that the portable device 30 is outside the vehicle when the ignition switch 16 is turned off. I made it.
Therefore, the position of the portable device 30 can be determined even in the jamming wave area.

(Other examples)
As mentioned above, although the keyless device for vehicles of the present invention has been described based on the first to third embodiments, the specific configuration is not limited to these embodiments, and each claim of the claims Design changes and additions are permitted without departing from the spirit of the invention.

It is a block diagram of the vehicle equipment of Example 1. FIG. It is a control block diagram of the control part of the vehicle equipment of Example 1. 1 is a configuration diagram of a portable device according to Embodiment 1. FIG. 3 is a control block diagram of a control unit of the portable device of Embodiment 1. FIG. 1 is a configuration diagram of a base station according to Embodiment 1. FIG. FIG. 3 is a control block diagram of a control unit of the base station according to the first embodiment. 7 is a flowchart illustrating a flow of interference wave information transmission processing according to the first embodiment. 3 is a table showing the relationship between the input level of the RF wave signal and the electric field strength in Example 1. 3 is a flowchart illustrating a flow of frequency switching processing according to the first embodiment. It is a figure which shows the disturbance wave area map of Example 1. FIG. 10 is a flowchart illustrating a flow of interference wave information transmission processing according to the second embodiment. 10 is a flowchart illustrating a flow of frequency switching processing according to the second embodiment. It is a figure which shows the jamming wave area map of Example 2. FIG. It is a block diagram of the vehicle equipment of Example 3. It is a control block diagram of the control part of the vehicle equipment of Example 3. It is a flowchart which shows the flow of the jamming wave information transmission process of Example 3. It is a table | surface which shows the relationship between the input level of the RF wave signal of Example 3, and electric field strength. 12 is a flowchart illustrating a flow of frequency switching processing according to the third embodiment. It is a disturbance wave area map of Example 3.

Explanation of symbols

10 In-vehicle device 16 Ignition switch (Engine drive switch)
17 Door switch 23a Portable device position determination unit 23c Interference wave area determination unit (interference wave area determination means)
23d Frequency switching command section (frequency switching command means)
23e Self-vehicle position calculation unit (position detection means)
23f Electric field intensity calculation unit (interference wave electric field intensity detection means)
36a Frequency switching part (frequency switching means)
40 base stations

Claims (7)

In a vehicle keyless device that controls a vehicle device by communication between a portable device and an in-vehicle device,
The portable device includes frequency switching means for switching the frequency of a signal transmitted by the portable device to the in-vehicle device to a plurality of frequencies,
The in-vehicle device is
A base station communication means for communicating with a base station having information on a disturbing wave area where a disturbing wave of a transmission signal transmitted by the portable device is generated;
Position detecting means for detecting the position of the host vehicle;
Based on the information on the jamming wave area and the information on the position of the host vehicle, jamming wave determining means for judging that the position of the host vehicle is the jamming wave area;
Frequency switching command means for commanding the portable device to switch the frequency of the transmission signal when the position of the host vehicle is in the jamming wave area;
A vehicle keyless device characterized by comprising: The keyless device for a vehicle according to claim 1,
The frequency switching command means maintains the frequency of the transmission signal used in the jamming wave area when the position of the host vehicle is no longer in the jamming wave area. In the keyless device for vehicles according to claim 1 or 2,
The frequency switching command means includes
A portable device position determining unit for determining whether the portable device is in the vehicle or outside the vehicle;
When the position of the host vehicle is in the jamming wave area and the portable device is determined to have moved from the inside of the vehicle to the outside of the vehicle, the portable device is instructed to switch the frequency of the transmission signal. A vehicle keyless device. The keyless device for a vehicle according to any one of claims 1 to 3,
The base station has, as information on the jamming wave area, information on the outside jamming wave area where the jamming wave is generated outside the vehicle and information on the car jamming wave area where the jamming wave is generated inside the car. ,
The jamming signal judging means judges that the position of the own vehicle is the outside jamming wave area or the in-car jamming wave area based on the information on the outside jamming wave area and the information on the inside jamming wave area. And
The frequency switching means is
A portable device position determining unit for determining whether the portable device is in the vehicle or outside the vehicle;
When the position of the own vehicle is in the outside disturbance area and not in the in-vehicle disturbance area, and it is determined that the portable device has moved from the inside of the vehicle to the outside of the vehicle, the frequency of the transmission signal is switched to the transmitter. The keyless device for vehicles characterized by instructing. In the keyless device for vehicles according to claim 3 or 4,
The portable device position determining unit inputs door opening / closing information from a door switch indicating an open / closed state of the door, and determines that the portable device is outside the vehicle based on the opening / closing of the door. apparatus. In the keyless device for vehicles according to claim 3 or 4,
The portable device position determining means inputs switch on / off information from an engine drive switch, and determines that the portable device is outside the vehicle when the engine drive switch is turned off from on. A vehicle keyless device. The keyless device for a vehicle according to any one of claims 1 to 6,
The in-vehicle device is
An interference wave electric field intensity detecting means for detecting the electric field intensity of the interference wave;
The base station communication means transmits information on the electric field strength of the interference wave and information on the position of the host vehicle to the base station,
The base station creates the information of the jamming wave area from the electric field strength information of the jamming wave and the position information of the host vehicle.

Images