JP2009141566A - In-vehicle receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an in-vehicle receiver capable of allowing a user to use a vehicle control system without anxiety while suppressing cost as much as possible. <P>SOLUTION: When it is determined that signal intensity (RSSI) is equal to or higher than a predetermined reference level based on an RSSI signal inputted from an AMP (S110;YES) during the stop of an engine in a vehicle, and the authentication of an ID code included in serial data inputted from a CMP is not successfully performed (S120;NO), a state flag Fa expressing a communication environmental state in the parking place of an object vehicle is set to "1" expressing the existence of interfering wave (S140) and also position information stored in a RAM is stored as interfering wave information expressing the position of the interfering wave (S150). Then, when the state flag Fa is "1" (S165;YES) in the case that the authentication of the ID code is successfully performed (S120;YES), an alarm is issued (S170). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle-mounted receiving apparatus that is mounted on a vehicle and receives a radio signal from the outside of the vehicle to perform vehicle control such as locking / unlocking of a vehicle door.

  Conventionally, a transmitter that transmits a signal including an ID code unique to a vehicle using radio waves having a preset frequency (hereinafter referred to as a fixed frequency), and a signal having a fixed frequency received and included in the signal 2. Description of the Related Art There is known a vehicle control system including an in-vehicle receiver that performs various vehicle controls when it is confirmed that a transmission source (that is, a transmitter) is a registered regular one based on an ID code.

  As one of this type of vehicle control system, when a user presses a button of a transmitter (hereinafter referred to as a portable device) carried by the user of the vehicle, the door provided on the vehicle (that is, a vehicle door) There is known a keyless entry system that performs the lock / unlock of (see, for example, Patent Document 1).

Moreover, as a development of such a keyless entry system, when a user having an electronic key as a portable device enters the wireless communication area around the vehicle, bidirectional communication between the electronic key and the in-vehicle receiving device There is a smart entry system in which an in-vehicle receiving device confirms a transmission source (that is, an electronic key).
JP 2002-129794 A

  However, in a conventional vehicle control system such as a keyless entry system or a smart entry system, when there is a radio wave (hereinafter referred to as an interfering wave) that interferes with a radio wave transmitted from a portable device at the parking position of the vehicle, the system Could not work well.

  In such a case, the cause is not easily understood, so the user may feel uneasy about how to respond, or the dealer who sells and maintains the vehicle There was a problem that the cause investigation could not be dealt with promptly.

  In order to solve the above-described problems, an object of the present invention is to provide an in-vehicle receiving device that allows a user to use a vehicle control system with confidence while suppressing cost as much as possible.

  The vehicle-mounted receiving device according to claim 1, which has been made to achieve the above object, is mounted on a vehicle used by a user (hereinafter referred to as a target vehicle), and includes a vehicle control system together with a portable device possessed by the user. When a signal (hereinafter referred to as a keyless signal) used in this vehicle control system is received from a portable device, it is represented by, for example, lock / unlock control of a door (hereinafter referred to as a vehicle door) provided in the target vehicle. Various vehicle controls are performed.

  Specifically, the receiving means receives a radio signal having a fixed frequency preset to the same frequency as the keyless signal, and the code authenticating means authenticates the ID code included in the received signal from the receiving means (ie, And determine whether the ID code is unique to the target vehicle). Then, when the vehicle control means succeeds in the authentication of the ID code by the code determination means, control of the vehicle state of the target vehicle (for example, lock / unlock control of the vehicle door) according to the control information included in the received signal I do.

  Here, the strength determining means determines the signal strength of the received signal from the receiving means. Then, the reception notification means determines that the signal strength is equal to or higher than a preset reference level by the strength determination means, and that the ID determination is failed by the code determination means, and the reception notification means A process of notifying that a jamming wave is present at a position (hereinafter referred to as a notification process) is executed when the notification condition is satisfied. Note that the interference wave refers to a radio wave that interferes with reception of a transmission signal (that is, a keyless signal) from a portable device.

  In other words, the in-vehicle receiver of the present invention, if the signal strength of the fixed-frequency radio signal received via the receiving means is not less than the reference level and the ID code unique to the target vehicle cannot be successfully authenticated, The notification processing is executed by regarding the signal as an interference wave.

  Therefore, according to the in-vehicle receiver of the present invention, even in a situation where the remote operation from the portable device does not work well due to the disturbing wave, the presence of the disturbing wave that caused it is automatically notified. It is possible to cause the user to appropriately take a countermeasure based on the cause, and to allow the user to use the vehicle control system with peace of mind.

In addition, according to the in-vehicle receiving device of the present invention, since the device configuration of the conventional in-vehicle receiving device remains, the manufacturing cost for the device can be suppressed.
Further, as described in claim 2, when the position acquisition means acquires position information indicating the current position of the target vehicle, and the first storage means detects that the target vehicle is parked, the position acquisition means The position information acquired by is temporarily stored. When the second storage means satisfies the notification condition while the engine of the target vehicle is stopped, the position information stored by the first storage means is used as interference wave information representing the position where the interference wave exists. It is desirable to memorize.

  According to the vehicle-mounted receiving device configured as described above, it is possible to accumulate information indicating the position where the jamming wave exists (that is, jamming wave information). As a result, the accumulated jamming wave information is, for example, It is possible to feed back the design change of the vehicle control system by changing the fixed frequency.

  In this case, since the current position of the target vehicle when storing the interference wave information by the second storage means is limited to the parking location of the target vehicle, that is, the location where the target vehicle is remotely operated from the portable device, It is possible to prevent the amount of interference wave information from being unnecessarily increased.

  Then, as described in claim 3, while the engine of the target vehicle is operating, the position notification means includes the position information acquired by the position acquisition means, and the interference wave information stored by the second storage means, It is desirable to execute the notification process when the two match.

  In this case, while the engine of the target vehicle is operating, the position information is sequentially acquired using the existing navigation system, and based on the position information and the jamming wave information accumulated in the past, When the target vehicle reaches the place where the jamming wave information is stored, the user is notified that the jamming wave exists at any time, so the jamming wave information accumulated in the past can be used effectively.

  In addition, as described in claim 4, it is preferable that the reception notification unit executes the notification process when the code authentication unit successfully authenticates the ID code. In this case, if the target vehicle is parked and the user is not in the vicinity of the target vehicle, the presence of the jamming wave is not notified, so that waste of control of the own device can be saved.

Embodiments of the present invention will be described below with reference to the drawings.
<Overall configuration>
FIG. 1 is a block diagram showing an outline of a keyless entry system configured by an in-vehicle receiving apparatus to which the present invention is applied.

  As shown in FIG. 1, a keyless entry system 1 is mounted on a transmitter (hereinafter referred to as a portable device) 2 carried by a user of a vehicle (hereinafter referred to as a target vehicle) that is a target of the system, and the target vehicle. Vehicle-mounted receiving device 3 and a plurality of vehicle control devices (hereinafter referred to as ECUs) 4. The plurality of ECUs 4 include at least a body ECU 4a that controls various vehicle states and a navigation ECU 4b that performs control for route guidance from the current position of the target vehicle to the destination.

  The keyless entry system 1 transmits a radio signal for the system (hereinafter referred to as a keyless signal) by using a radio wave having a preset frequency (hereinafter referred to as a fixed frequency) by the portable device 2, and a vehicle-mounted receiving device 3 receives the keyless signal, and realizes a keyless entry function for locking / unlocking a door (hereinafter referred to as a vehicle door) provided in the target vehicle via the body ECU 4a.

  In the keyless entry system 1, the portable device 2 generates serial data Sd representing ID code unique to the target vehicle, control information for specifying the control contents (for example, door lock) in the keyless entry system 1, and the like. A keyless signal is transmitted after being modulated to a fixed frequency carrier wave by the serial data Sd.

  In the keyless entry system 1, the in-vehicle receiving device 3 receives the keyless signal transmitted from the portable device 2, restores the serial data Sd from the keyless signal, and the ID code included in the serial data Sd. When the authentication is successful, a control command corresponding to the control information included in the serial data Sd is transmitted to the body ECU 4a.

  Although not shown, the body ECU 4a is connected to a door lock actuator, a back door actuator, a shift lever, a hazard lamp, and the like. The body ECU 4a controls the locking / unlocking of the vehicle door and the unlocking of the back door by driving the door lock actuator and the back door actuator in accordance with the control command from the in-vehicle receiving device 3, and the hazard. This is a well-known system for answering a user by blinking a lamp once.

  When the body ECU 4a of the present embodiment detects that the shift lever has entered the parking position, the body ECU 4a supplies detection information indicating this to the in-vehicle receiving device 3 and will be described later from the in-vehicle receiving device 3. When a notification command for notifying that an interfering wave exists is received, an alarm notification is made via a hazard lamp.

  Although not shown in the drawing, the navigation ECU 4b is a map data input device for inputting map data and the like, and a position detector for outputting various detection signals for calculating the position, direction, moving distance, etc. of the target vehicle. Further, a display device such as a liquid crystal display, an audio output device for outputting various guide sounds, and the like are connected.

  The navigation ECU 4b calculates the current position of the target vehicle as a set of coordinates and traveling directions based on the detection signal from the position detector, and displays a map image near the current position read via the map data input device. It is well known to execute map display processing to be displayed on the screen, route calculation for obtaining an optimal route from the current position to the destination, and route guidance processing to perform route guidance via the display device and the voice output device.

  The navigation ECU 4b according to the present embodiment supplies position information indicating the current position of the target vehicle to the in-vehicle receiving device 3, and when receiving a notification command from the in-vehicle receiving device 3, an alarm is output via the display device or the audio output device. It is comprised so that it may alert | report.

<Configuration of in-vehicle receiver>
FIG. 2 is a block diagram showing the configuration of the in-vehicle receiving device to which the present invention is applied.
As shown in FIG. 2, the in-vehicle receiving device 3 selectively passes a reception antenna 11 that receives a radio signal and a reception signal from the reception antenna 11 that has a fixed frequency (that is, the same frequency as the keyless signal). A band pass filter (BPF) 12 for amplification, an amplifier circuit (AMP) 13 for amplifying the received signal that has passed through the BPF 12, a local oscillator 14 for generating a high-frequency signal of a constant frequency for frequency conversion, and amplification by the AMP 13 The received signal and the high-frequency signal from the local oscillator 14 are mixed to convert the received signal to a predetermined intermediate frequency, and the received signal frequency-converted to the intermediate frequency by the mixing circuit 15 is selectively selected. And a band-pass filter (BPF) 16 that passes through the BPF 16 and an amplification circuit that amplifies the received signal after frequency conversion that has passed through the BPF 16 MP) 17, a detection circuit (DET) 18 for detecting the reception signal amplified by the AMP 17, and a low-pass filter (LPF) 19 for removing unnecessary high-frequency signal components from the reception signal detected by the DET 18. A comparator (CMP) 20 that restores serial data Sd representing an ID code, control information, etc. by comparing a received signal that has passed through the LPF 19 with a preset reference voltage, AMP17, CMP20, body ECU 4a, navigation A control unit 21 that executes various processes in response to inputs from the ECU 4b and controls the body ECU 4a and the navigation ECU 4b is provided.

  Among these, the AMP 17 is connected to an RSSI (Received Signal Strength Indicator) circuit 17 a that detects the signal strength (voltage level) of the received signal from the receiving antenna 11. The RSSI circuit 17a is a known circuit that detects the power consumption in the AMP 17 from the amount of current flowing into the AMP 17, and outputs a voltage signal corresponding to the amount of current as an RSSI signal Sr representing the signal strength of the received signal. is there.

  The control unit 21 is composed mainly of a well-known microcomputer comprising a CPU, ROM, RAM, I / O and a bus line for connecting these components, and stores stored information even when main power is not supplied. A non-volatile memory (for example, EEPROM).

  Then, based on the program stored in the ROM, the CPU receives the detection information from the body ECU 4a when the target vehicle is parked and receives the detection information from the body ECU 4a in addition to the reception control process and the position information control process described below. And a parking position storing process for temporarily storing the position information in the RAM is executed.

<Reception control processing>
Here, the reception control process executed by the control unit 21 will be described in detail with reference to the flowchart shown in FIG. This process is repeatedly executed while the engine of the target vehicle is stopped (that is, the ignition switch is off).

  First, when this process is started, in S110, based on the RSSI signal Sr input from the AMP 17, whether the signal strength (RSSI) of the received signal from the receiving antenna 11 is equal to or higher than a preset reference level. If the determination is affirmative and the determination is affirmative, the process proceeds to S120. If the determination is negative, the process is terminated.

  In S120, the serial data Sd is acquired from the CMP 20, and the ID code included in the serial data Sd is authenticated. Specifically, the ID code is read from the serial data Sd, and it is determined whether or not this ID code matches that registered in advance. If the ID code authentication is successful (S120; YES), the process proceeds to S160. If the ID code authentication fails (S120; NO), the process proceeds to S130.

  In S130, the count value Wt of the continuation counter for counting the number of times the ID code authentication failed in S120 is incremented (Wt ← Wt + 1). The count value Wt is initially set (Wt = 0) when the engine of the target vehicle is operated (that is, the ignition switch is turned on).

  In subsequent S135, it is determined whether or not the count value Wt of the continuation counter is equal to or greater than a predetermined number W set in advance, and if an affirmative determination is made, it is assumed that an interference wave exists at the parking position of the target vehicle. In S140, if a negative determination is made, the count value Wt is left as it is (without initial setting), and the process returns to S110 again. The interference wave refers to a radio wave that interferes with reception of a keyless signal transmitted from the portable device 2.

In S140, the state flag Fa representing the state of the communication environment at the parking position of the target vehicle is set to 1 representing the presence of the jamming wave, and the process proceeds to S150.
In S150, the position information stored in the RAM is stored in the nonvolatile memory as interference wave information indicating the position where the interference wave exists.

In subsequent S155, the count value Wt of the continuation counter is initially set (Wt = 0), and this process ends.
On the other hand, in S160, which proceeds when the ID code is successfully authenticated in S120, a control command (for example, unlocking the vehicle door) according to the control information included in the serial data Sd acquired in S120 is sent to the body ECU 4a. Send to. The body ECU 4a that has received this control command controls the vehicle state (for example, unlocks the vehicle door) by driving an actuator (for example, a door lock actuator) according to the control content.

In subsequent S165, it is determined whether or not the status flag Fa is set to 1. If an affirmative determination is made, the process proceeds to S170, and if a negative determination is made, the present process is terminated.
In S170, a control command for notifying that an interference wave is present at the current position of the target vehicle is transmitted to the body ECU 4a. When the body ECU 4a receives this control command, the body ECU 4a performs notification (alarm notification) that an interfering wave exists, for example, by performing answer-back by blinking a hazard lamp a plurality of times.

In subsequent S175, the state flag Fa is set to 0 (that is, initial setting) indicating that no disturbing wave is present at the parking position, and this processing is terminated.
That is, by this processing, if a radio signal having a fixed frequency has a signal strength equal to or higher than a reference level and a signal other than the keyless signal is present at the parking position of the target vehicle, the user can By repeatedly operating the portable device 2 while approaching, when the in-vehicle receiving device 3 receives the keyless signal, the vehicle door is locked / unlocked, and it is notified that there is an interference wave at that time. Will be.

<Position information control processing>
Here, the positional information control process executed by the control unit 21 will be described in detail along the flowchart shown in FIG. This process is repeatedly executed at a preset control timing while the engine of the target vehicle is operating (that is, the ignition switch is on).

First, when this process is started, in S210, position information is acquired from the navigation ECU 4b.
In subsequent S220, it is determined whether or not the position information acquired in S210 matches the disturbing wave information stored in the non-volatile memory. If an affirmative determination is made, the current position of the target vehicle is disturbed in the past. If it is determined that the wave exists, the process proceeds to S230. If a negative determination is made, the process proceeds to S250.

  In S230, a control command for notifying (alarm notification) that an interference wave is present at the current position of the target vehicle is transmitted to the navigation ECU 4b. When the navigation ECU 4b receives this control command, the navigation ECU 4b notifies the presence of an interfering wave via the audio output device and causes the display device to start displaying an alarm (message, mark, etc.) indicating the presence of the interfering wave.

In subsequent S240, the display flag Fd indicating the state displayed on the display device is set to 1 indicating that the display device displays an alarm.
On the other hand, in S250, which proceeds when a negative determination is made in S220, it is determined whether or not the display device is displaying an alarm (that is, Fd = 1) based on the display flag Fd. If YES, the process proceeds to S260. If a negative determination is made, this process ends.

In S260, the navigation ECU 4b transmits a control command for causing the display device to end the display of an alarm (message, mark, etc.) indicating the presence of the interference wave.
In subsequent S270, the display flag Fd is set to 0 indicating that the display device does not display an alarm, and this process is terminated.

  That is, by this process, while the engine of the target vehicle is operating regardless of whether or not the target vehicle is running, the position information is sequentially acquired from the navigation ECU 4b, and the current position of the target vehicle is obtained in the past as interference wave information. If the location is stored, the alarm is continuously displayed.

<Effect of this embodiment>
As described above, in the in-vehicle receiving device 3 of the present embodiment, the reception control process performed by the control unit 21 causes the received signal from the receiving antenna 11 to have an ID that is higher than the reference level and unique to the target vehicle. If the authentication of the code is not successful, the alarm notification is performed assuming that an interfering wave is present at the current position (ie, the parking position) of the target vehicle.

  Therefore, according to the in-vehicle receiving device 3 of the present embodiment, even if the remote operation from the portable device 2 does not work well due to the interference wave, the presence of the interference wave causing the failure is automatically notified. Therefore, it is possible to make the user take an appropriate action based on the cause, and as a result, the user can use the keyless entry system 1 with peace of mind.

  Further, in the in-vehicle receiving device 3, if the position information matches the jamming wave information by the position information control process performed by the control unit 21, the current position of the target vehicle is regarded as the position where the jamming wave existed in the past, Alarm notification is performed via the display device and the audio output device.

  Therefore, according to the in-vehicle receiving device 3, when the target vehicle reaches the place where the jamming wave information is stored in the past, the jamming wave information accumulated in the past is used to notify the user that the jamming wave exists at any time. It can be used effectively.

  Furthermore, in the in-vehicle receiving device 3, the alarm notification is performed via the body ECU 4a while the engine of the target vehicle is stopped, and via the navigation ECU 4b while the engine of the target vehicle is operating. If there is an interference wave at the current position of the target vehicle, it can be notified to the user regardless of the operating state of the engine of the target vehicle.

[Other Embodiments]
As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it is possible to implement in various aspects.

  For example, in the reception control process of the above embodiment, alarm notification is performed together with locking / unlocking of the vehicle door. However, the present invention is not limited thereto, and the reception signal from the reception antenna 11 is disturbed based on the signal strength and the ID code. If it is determined whether it is a wave, and it is determined that it is an interference wave, an alarm notification may be immediately performed.

  Furthermore, the reception control process of the above embodiment is not performed while the engine of the target vehicle is operating, but is not limited to this, and is performed while the engine of the target vehicle is operating. But you can do it.

  Further, in the reception control process of the above embodiment, the determination as to whether or not the received signal is an interference wave is repeatedly performed using a continuation counter. An alarm notification may be performed immediately after the determination.

  In the reception control process of the above embodiment, the position information and the interference wave information acquired when the target vehicle is parked are stored in different memories (RAM and non-volatile memory). You may memorize.

  Furthermore, you may make it make the control part of vehicle control apparatuses (ECU) 4, such as body ECU4a and navigation ECU4b, perform the reception control process and position information control process which the control part 21 of the vehicle-mounted receiver 3 performs. .

  The in-vehicle receiving device 3 is not limited to the keyless entry system, and may be used as a component of another vehicle control system (for example, a smart entry system).

The block diagram which shows the outline | summary of the keyless entry system which the vehicle-mounted receiving apparatus with which this invention was applied comprises. The block diagram which shows the structure of the vehicle-mounted receiving apparatus with which this invention was applied. The flowchart which shows the detail of the reception control process which the control part 21 performs. The flowchart which shows the detail of the positional information control process which the control part 21 performs.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Keyless entry system, 2 ... Portable machine, 3 ... In-vehicle receiver, 4a ... Body ECU, 4b ... Navi ECU, 11 ... Reception antenna, 12 ... BPF, 13 ... AMP, 14 ... Local oscillator, 15 ... Mixing circuit, 16 ... BPF, 17 ... AMP, 18 ... DET, 19 ... LPF, 20 ... CMP, 21 ... control section.

Claims (4)

Mounted on the vehicle,
Receiving means for receiving a radio signal having a fixed frequency set in advance;
Code authenticating means for authenticating an ID code included in a received signal from the receiving means;
Vehicle control means for controlling the vehicle state in accordance with the control information included in the received signal when the code authentication means succeeds in authenticating the ID code;
In-vehicle receiver with
Strength determining means for determining the signal strength of the received signal;
It is determined that the signal strength is not less than a preset reference level by the strength judging means, and the current location of the vehicle is obstructed by a notification condition that the code authentication means has failed to authenticate the ID code. Reception notification means for performing notification processing for notifying that a wave is present when the notification condition is satisfied;
A vehicle-mounted receiving device comprising: Position acquisition means for acquiring position information representing the current position of the vehicle;
When detecting that the vehicle is parked, first storage means for temporarily storing the position information acquired by the position acquisition means;
When the notification condition is satisfied while the vehicle engine is stopped, the position information stored by the first storage unit is stored as interference wave information indicating a position where the interference wave exists. Storage means;
The in-vehicle receiver according to claim 1, comprising:   Position notification for executing the notification process when the position information acquired by the position acquisition means coincides with the jamming wave information stored by the second storage means while the engine of the vehicle is operating. The vehicle-mounted receiving device according to claim 2, further comprising: means.   The in-vehicle receiving device according to any one of claims 1 to 3, wherein the reception notification unit executes the notification process when the code authentication unit succeeds in authenticating the ID code.

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