JP2010144366A - Keyless entry system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a keyless entry system which can establish compatibility between the miniaturization of a portable machine and a great increase in a receivable distance. <P>SOLUTION: An in-vehicle machine 20 can increase a transmittable distance of a second signal B so as to transmit a return signal about in-vehicle control equipment to the portable machine 1 according to the second signal B at a second transmission rate lower than a first transmission rate, with respect to a first signal A at the first transmission rate, which is transmitted from the portable machine 1 with an output portion. Thus, since a transmission antenna 6 enables a shortage of the receivable distance on the side of the small portable machine to be filled up with an increase in the transmittable distance on the side of the in-vehicle machine, the transmittable distance can become long. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a keyless entry system that remotely locks / unlocks a vehicle door without using an engine key, and more particularly, to a keyless entry system capable of returning from the vehicle side.

  Conventionally, a vehicle keyless entry system performs wireless communication between a portable transmission / reception device (portable device) such as an electronic key carried by a passenger and a vehicle-side transmission / reception device (on-vehicle device) mounted on the vehicle. The door electromagnetic actuator is actuated and unlocked when the ID code transmitted from is authenticated as a regular ID code on the vehicle side.

  Patent Document 1 provides an in-vehicle device that receives a remote operation signal for controlling locking / unlocking of a door output from a portable device and an air pressure monitoring signal for monitoring the air pressure of a tire. Has proposed a technology that can switch the cut-off frequency according to the on / off state of the ignition switch.

  In Patent Document 1, since the cut-off frequency can be switched according to the ON / OFF state of the ignition switch, the vehicle-less device of the keyless entry system can be used also as a receiver for monitoring tire air pressure. The machine can be used efficiently.

JP 2005-120656 A

  On the other hand, in recent years, the digitization of vehicles has progressed rapidly, and various electronic control mechanisms are mounted on vehicles. There are also a number of control mechanisms that transmit and receive predetermined signals wirelessly, such as a keyless entry system and a tire pressure monitoring mechanism. For example, a so-called engine remote start mechanism that automatically starts the engine from a long distance is also part 1 thereof. One.

  In general, the engine remote start mechanism has a specification that allows the engine to be started when an ID code transmitted from a dedicated portable device is authenticated and matched with a regular ID code. As in Patent Document 1, as a vehicle-mounted device is also used, it is possible to improve the convenience of passengers by using a dedicated portable device also as a portable device of a keyless entry system.

  By the way, since the keyless entry system is mainly intended for locking / unlocking the door, the communicable distance of the transceiver in the keyless entry system is assumed to be a short distance assuming that the occupant approaches the door. Yes.

  On the other hand, the engine remote start mechanism requires operation from a remote location where it takes time for the occupant to reach the host vehicle from the viewpoint of warming up the engine and starting the auto air conditioner. The communicable distance is a long distance compared to the communicable distance. Further, in the engine remote start mechanism, since an occupant cannot directly see the operation of the engine, a return signal of the operation status is required as to whether or not the engine has started.

  Generally, in a weak wireless device such as a keyless entry system, a new weak standard (3m method) is defined by the Radio Law, and its output is constant. Therefore, when the transmission rate (number of transmission bits / sec) is constant, the communicable distance is affected by the size of the antenna on the receiving side.

  When the occupant remotely starts the engine with a portable device, the transmission signal can be received by the in-vehicle device even if it is transmitted from a long distance because the in-vehicle device's antenna is large and the receivable distance is long. It is. However, when the engine start status is returned from the in-vehicle device side, there is a problem that the portable device cannot receive the return signal because the antenna of the portable device is small and the receivable distance is short. In particular, the tendency becomes more prominent as the portable device becomes more compact.

  An object of the present invention is to provide a keyless entry system capable of achieving both a compact portable device and a long receivable distance.

  The keyless entry system of the present invention includes a portable device carried by a passenger and an in-vehicle device capable of receiving a signal transmitted from the portable device, and the in-vehicle device receives a predetermined signal transmitted from the portable device. By doing so, the vehicle-mounted control device can be operated.

  In the first aspect of the present invention, the portable device includes an output unit that outputs predetermined information based on a return signal from the in-vehicle device, and the in-vehicle device has a first transmission rate transmitted from the portable device. For one signal, a return signal is transmitted to the portable device by a second signal having a second transmission rate lower than the first transmission rate.

  In the invention of claim 1, the vehicle-mounted device transmits a return signal to the portable device by a second signal having a second transmission rate lower than the first signal of the first transmission rate transmitted from the portable device. The communicable distance from the machine can be increased.

  According to a second aspect of the present invention, in the first aspect of the invention, the portable device includes a display unit that displays operation information regarding the in-vehicle control device based on a return signal from the in-vehicle device.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the in-vehicle control device is a first control device that is operated from a short distance of the vehicle, and a second control device that is operated from a distance farther than the first control device. And the first control device is operable with a first signal of the first transmission rate, and the second control device is configured with a third signal of a third transmission rate lower than the first transmission rate. It is made operable.

  According to a fourth aspect of the present invention, in the third aspect of the invention, the first control device includes a door lock unit that performs a lock / unlock operation of the vehicle door, a door operation unit that performs an opening / closing operation of the vehicle door, and a vehicle door. It is at least one of window opening / closing means for opening and closing the glass.

  According to a fifth aspect of the present invention, in the third or fourth aspect of the present invention, the second control device includes engine remote start means for remotely starting the engine of the vehicle, vehicle position detection means capable of detecting the parking position of the vehicle, It is at least one of the vehicle state display means for displaying the state of the in-vehicle control device on the portable device.

  The invention of claim 6 is the invention according to any one of claims 3 to 5, wherein the in-vehicle device uses the third transmission rate for the third signal of the third transmission rate transmitted from the portable device. A return signal is transmitted to the portable device by a fourth signal having a lower fourth transmission rate.

  According to the first aspect of the present invention, it is possible to achieve both compactness of the portable device and an increase in the receivable distance. That is, as shown in FIG. 6, the relationship between the communicable distance and the signal transmission rate (number of transmission bits / sec) has a characteristic that the communicable distance becomes longer as the transmission rate is lower. Paying attention to this characteristic, the transmission rate of the return signal from the in-vehicle device is made lower than the transmission rate of the transmission signal from the portable device, so that the shortage of the receivable distance on the portable device side with a small antenna is reduced to the in-vehicle device side. It can be replenished with an increase in the transmittable distance. In addition, the portable device can be made compact without significant changes on the in-vehicle device side.

  According to the invention of claim 2, since the portable device has a display unit that displays the operation information related to the vehicle-mounted control device based on a return signal from the vehicle-mounted device, it is easy for an occupant to check the operation state of the vehicle-mounted control device. This improves convenience.

  According to a third aspect of the present invention, the in-vehicle control device includes a first control device that is operated from a short distance of the vehicle, and a second control device that is operated from a distance farther than the first control device. Since the control device is operable with the first signal of the first transmission rate and the second control device is operable with the third signal of the third transmission rate lower than the first transmission rate, For the first control device, it is possible to increase the communicable distance without causing a sense of delay for the occupant while ensuring the response speed.

  According to a fourth aspect of the present invention, the first control device performs door locking means for locking / unlocking the vehicle door, door operating means for opening / closing the vehicle door, and opening / closing operation of the vehicle door glass. Since it is at least one of the window opening / closing means to be performed, the receivable distance of the portable device can be increased while ensuring the response speed of the first control device.

  According to a fifth aspect of the present invention, the second control device includes an engine remote start means for remotely starting a vehicle engine, a vehicle position detection means capable of detecting a parking position of the vehicle, and a state of the in-vehicle control equipment. Since it is at least one of the vehicle state display means to be displayed on the portable device, the receivable distance of the portable device while ensuring the response speed of the first control device without affecting the operation of the second control device. Can be extended.

  According to a sixth aspect of the present invention, the in-vehicle device has a fourth signal with a fourth transmission rate lower than the third transmission rate with respect to the third signal with the third transmission rate transmitted from the portable device. Thus, since the return signal is transmitted to the portable device, the receivable distance of the portable device can be increased while ensuring the response speed for both the first control device and the second control device.

  Hereinafter, the best mode for carrying out the present invention will be described.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the keyless entry system S, and FIG. 2 shows an external view of a portable transmission / reception apparatus (portable device) according to the present embodiment.

  As shown in FIG. 1, a portable device 1 that can be carried by an occupant includes a transmitter 2 having a crystal oscillator, a modulator 3, a controller 4, and eight operation switches 5a, 5b that are normally turned off and can be turned on and off. The transmitter switch 5 is composed of 5h, the transmission antenna 6, and a power source (not shown).

  As shown in FIG. 2, operation buttons 8 a, 8 b,... 8 h for remotely operating a liquid crystal display unit 7 (output unit) and various vehicle-mounted control devices mounted on the vehicle V are installed on the surface of the portable device 1. ing. Note that the operation buttons 8a, 8b,... 8h are respectively linked to the operation switches 5a, 5b,... 5h. Is configured to be turned on.

  Further, the transmission antenna 6 also serves as a reception antenna that receives a return signal from a vehicle-side transmission / reception device (on-vehicle device) 20 described later. When the return signal is received, the control unit 4 is configured to be able to display the operation state of various on-vehicle control devices stored in the return signal on the display unit 7. In addition, it is also possible to provide notifying means for notifying the operating state of various in-vehicle control devices separately from the display unit 7, and it is also possible to provide only notifying means for the purpose of downsizing.

  As shown in FIG. 1, the vehicle V of this embodiment has a plurality of various on-vehicle control devices that can be operated by remote control. The vehicle V operates a door lock mechanism 9 (door lock means) that can be locked / unlocked by operating an electromagnetic actuator of a door lock, and similarly a slide door operation mechanism 10 (door operation means) that can open a slide door. And a window opening / closing mechanism 11 (window opening / closing means) capable of opening / closing the door window by operating an electromagnetic motor of the door.

  The vehicle V detects the position of the host vehicle V based on GPS information from the engine remote start mechanism 12 (engine remote start means) capable of starting the engine and the navigation system, and transmits this position information to the portable device 1. It has a possible vehicle position detection mechanism 13 (vehicle position detection means) and a vehicle state display mechanism 14 (vehicle state display means) for displaying the state of various vehicle control devices on the portable device 1. Although not shown, depending on the specifications of the vehicle V, a rear member operating mechanism that can open the lift gate and the trunk, an auto air conditioner operating mechanism that can operate the auto air conditioner, and the like can be mounted.

  The vehicle position detection mechanism 13 is configured to display the position direction of the host vehicle V with an arrow or the like on the display unit 7 of the portable device 1 based on the position of the host vehicle V and the position of the portable device 1 carried by the passenger. . The vehicle state display mechanism 14 detects the operation completion state of each control device corresponding to each operation button after the operation of the operation buttons 8a, 8b... 8h by the occupant, and indicates whether or not the operation has been completed on the display unit 7 of the portable device 1. It is configured to display.

  The operation buttons 8a, 8b... 8h are set corresponding to the operation of the various vehicle-mounted control devices. The operation button 8a is an unlocking operation of the door lock mechanism 9, the operation button 8b is a locking operation of the door lock mechanism 9, the operation button 8c is an opening operation of the sliding door operation mechanism 10, and the operation button 8d is an operation and operation of the window opening / closing mechanism 11. The button 8e is set to start the engine of the engine remote start mechanism 12, the operation button 8f is set to transmit position information of the vehicle position detection mechanism 13, and the operation button 8g is set to transmit information of the vehicle state display mechanism 14. In particular, the operation button 8h is set to operate simultaneously with the unlock operation of the door lock mechanism 9 and the engine start of the engine remote start mechanism 12.

  The vehicle-mounted device 20 mounted on the vehicle V includes a control unit 21, an antenna 22 that receives a signal transmitted from the portable device 1, and a bandpass filter (BPF) that extracts a predetermined modulation signal from the signal received by the receiving antenna 22. ) 23 (filter means). The receiving antenna 22 on the in-vehicle device 20 side is, for example, 0.25 m (λ / 4), is larger than the transmitting antenna 6 on the portable device 1 side, and is disposed inside the instrument panel of the vehicle V.

  Further, the receiving antenna 22 is a return signal for returning to the portable device 1 operational states of various vehicle control devices based on transmission signals from the portable device 1, for example, operation completion or vehicle position information from the vehicle position detecting mechanism 13. Also serves as a transmission antenna. This return signal is formed by the control unit 21 that has received the operating state signal from various vehicle control devices, and is returned by the receiving antenna 22.

  The control unit 21 includes a high-frequency amplifier, a mixer, a local transmitter, a received signal strength detection circuit (RSSI circuit), and the like (not shown), and is configured to demodulate a predetermined modulation signal transmitted from the portable device 1. Yes. Since the configuration of the control unit is known, the description thereof is omitted.

  The BPF 23 includes a BPF 23a that extracts a signal having a high cutoff frequency, that is, a so-called first transmission rate, and a BPF 23b that extracts a signal having a so-called low third transmission rate, which has a lower cutoff frequency than the BPF 23a. .

  Each BPF 23a, 23b is connected in parallel to the signal received by the receiving antenna 22, and is configured to be input to both BPFs 23a, 23b when a predetermined signal is received. The number of BPFs 23 in the present embodiment is the number of transmission rates of signals to be used. However, the number of filters can be reduced by using an active filter with a variable detection frequency.

  As shown in FIG. 3, in the keyless entry system S, various on-vehicle control devices are classified based on the operation distance from the vehicle V in consideration of the operation position by the occupant, the feeling of delay, the anti-theft property, and the like. In other words, there is a high possibility that the occupant operates various on-vehicle control devices from a short distance, and the responsiveness is not required as much as the first control device and the first control device that require the most responsiveness. It is classified into the 2nd control equipment with high possibility of doing.

  The first control device is a control device that is likely to be operated by a passenger from a short distance, and includes a door lock mechanism 9 that locks / unlocks the door, a slide door operation mechanism 10 that opens the slide door, and a window opening / closing operation. A window opening / closing mechanism 11 is provided. The second control device is a control device that is highly likely to be operated from a long distance and does not require responsiveness. The engine remote start mechanism 12 that starts the engine, the vehicle position detection mechanism 13 that detects the position of the host vehicle, and the control The vehicle status display mechanism 14 displays the status of the device.

  Next, operations of various in-vehicle control devices according to the keyless entry system S will be described.

(First control device operation)
As shown in FIG. 4A, when the occupant turns on an operation button of the portable device 1 corresponding to the first control device operation, for example, the operation button 8a, the operation switch 5a of the transmitter switch 5 is turned on, A code signal corresponding to the unlocking operation of the door lock mechanism 9 is output from the control unit 4 to the modulation unit 3. The transmitter 2 has a 314.35 MHz crystal oscillator for a carrier signal. The modulator 3 modulates the carrier signal based on the code signal to create a modulated signal, and then sends a high first transmission from the transmitting antenna 6. The first signal A of the rate is transmitted.

  The first signal A is composed of seven component signals, and various data including an authentication ID code, a synchronization signal, and a door unlock command are stored in each component signal.

  The first signal A received by the receiving antenna 22 is distributed to the BPFs 23a and 23b and detected by the BPF 23a. After the door unlock command (first signal A) detected by the BPF 23a is sent from the control unit 21 to the door lock mechanism 9, the door lock mechanism 9 performs the unlocking operation.

  When the unlocking operation of the door lock mechanism 9 is completed, an operation completion signal is transmitted from the door lock mechanism 9 to the control unit 21. As shown in FIG. 4B, the control unit 21 that has received the operation completion signal transmits a second signal B having a second transmission rate lower than the first signal A from the receiving antenna 22 after creating the modulated signal. ing. Since the second signal B has a low second transmission rate, the transmittable distance can be made longer than that of the first signal A, and transmission to the portable device 1 is possible.

  The second signal B received by the transmission antenna 6 is detected by a BPF (not shown) and analyzed by the control unit 4. Thereafter, the control unit 4 transmits an operation completion signal to the display unit 7, and the completion of the door unlock operation is displayed. Even if the occupant is operating from a position away from the vehicle V, the display unit 7 can confirm the completion of the door unlocking operation. Even when the operation is performed from a short distance from the vehicle V, since the transmission rate of the first signal A is high, the responsiveness of the door lock mechanism 9 is ensured. Regarding the operation of the sliding door operation mechanism 10 and the window opening / closing mechanism 11, signals similar to those described above are transmitted and received.

(Second control device operation)
As shown in FIG. 4C, when the occupant turns on the operation button of the portable device 1 corresponding to the operation of the second control device, for example, the operation button 8e, the operation switch 5e of the transmitter switch 5 is turned on, A code signal corresponding to engine start of the engine remote start mechanism 12 is output from the control unit 4 to the modulation unit 3. The transmitter 2 has a 314.35 MHz crystal oscillator for a carrier signal. The modulator 3 modulates the carrier signal based on the code signal to create a modulated signal, and then transmits the modulated signal from the transmission antenna 6 to the first transmission rate. A third signal C having a lower third transmission rate is transmitted.

  The third signal C is composed of seven component signals, and each component signal stores various data including an authentication ID code, a synchronization signal, and an engine start.

  The third signal C received by the receiving antenna 22 is distributed to the BPFs 23a and 23b and detected by the BPF 23b. The engine start command (third signal C) detected by the BPF 23b is sent from the control unit 21 to the engine remote start mechanism 12, and then the engine remote start mechanism 12 starts the engine.

  When the engine start of the engine remote start mechanism 12 is completed, an engine start completion signal is transmitted from the engine remote start mechanism 12 to the control unit 21. As shown in FIG. 4D, the control unit 21 that has received the engine start completion signal transmits a fourth signal C having a fourth transmission rate lower than the third signal C from the receiving antenna 22 after generating a modulated signal. is doing. Since the fourth signal C has a lower fourth transmission rate, the transmittable distance can be made longer than that of the third signal C, and transmission to the portable device 1 is possible.

  The fourth signal received by the transmission antenna 6 is detected by a BPF (not shown) and analyzed by the control unit 4. Thereafter, the control unit 4 transmits an engine start completion signal to the display unit 7, and the engine start completion is displayed. Even when the occupant is operating from a position away from the vehicle V, the display unit 7 can confirm the completion of engine start. In addition, signals similar to those described above are transmitted and received for the operations of the vehicle position detection mechanism 13 and the vehicle state display mechanism 14. Further, the vehicle position detection mechanism 13 is configured to display the direction in which the vehicle V exists on the display unit 7 based on the position information of the vehicle V by an arrow or the like.

  In particular, when the occupant turns on the operation button 8h, the operation switch 5h of the transmitter switch 5 is turned on, and the control unit 4 outputs code signals corresponding to both the operations to the modulation unit 3, respectively. The modulation unit 3 modulates each carrier signal based on the code signal to create a modulated signal.

  Like the third signal C, this signal is composed of seven component signals of the third transmission rate related to engine start, and the first transmission rate of the first transmission rate related to the unlocking operation incorporated in one component signal. It consists of seven component signals. In each component signal, various data including an engine start authentication ID code, a synchronization signal and an engine start command, and various data including an unlock operation authentication ID code, a synchronization signal and a door unlock command are stored. Has been.

  The signal received by the receiving antenna 22 is distributed to the BPFs 23a and 23b, and the door unlock command is detected by the BPF 23a and the engine start command is detected by the BPF 23b. After both the unlock operation of the door lock mechanism 9 and the engine start of the engine remote start mechanism 12 are completed, the control unit 21 generates a modulation signal and then receives a third signal C from the receiving antenna 22. A fourth signal C having a lower fourth transmission rate is transmitted. The fourth signal C stores two completion signals, that is, unlock operation completion and engine start completion.

The transmission control process of the keyless entry system S will be described based on the flowchart of FIG. Si (i = 1, 2,...) Indicates each step.
The control unit 4 of the portable device 1 always detects the operation of each transmitter switch 5 every predetermined cycle, and determines whether or not each operation switch 5a to 5h constituting the transmitter switch 5 is turned on. Perform (S1). As a result of the determination in S1, when the transmitter switch 5 is not turned on, the detection is continued.

  If the transmitter switch 5 is turned on as a result of the determination in S1, the process proceeds to S2, and it is determined whether or not the operation button of the predetermined first control device has been operated. As a result of the determination in S2, when the operation button of the predetermined first control device is operated, the process proceeds to S3, and the first signal A having the first transmission rate is transmitted. The first signal A of S3 stores operation command data of a predetermined first control device corresponding to the operation button.

  After the transmission of S3, the process proceeds to S4, where it is determined whether the control unit 21 of the in-vehicle device 20 has received status information to be returned from the predetermined first control device to the portable device 1, for example, an operation completion signal. . As a result of the determination in S4, when there is operation state information of the control device to be returned to the portable device 1, the process proceeds to S5, and the state information is returned by the second signal B having the second transmission rate lower than the first transmission rate. .

  After the reply of S5, the control unit 4 displays the state information of the predetermined first control device on the display unit 7 (S6) and returns. As a result of the determination in S4, when there is no operation state information of the control device to be returned to the portable device 1, the process returns and returns.

  If the operation button of the predetermined first control device is not operated as a result of the determination in S2, the operation button of the predetermined second control device is operated, so that the process proceeds to S7 and is lower than the first transmission rate. A third signal C having a third transmission rate is transmitted. The third signal C of S7 stores operation command data of a predetermined second control device corresponding to the operation button.

  After the transmission of S7, the process proceeds to S8, where the control unit 21 of the in-vehicle device 20 returns the operation state information of the control device to be returned from the predetermined second control device to the portable device 1, for example, the operation completion signal, or It is determined whether vehicle position information or the like has been received. If there is state information to be returned to the portable device 1 as a result of the determination in S8, the process proceeds to S9, and the state information is returned by a fourth signal D having a fourth transmission rate lower than the third transmission rate.

  After the reply of S9, the control unit 4 displays the state information of the predetermined second control device on the display unit 7 (S10) and returns. As a result of the determination in S8, if there is no operation state information of the control device to be returned to the portable device 1, the process returns and returns.

Next, the operation and effect of the keyless entry system S according to the present embodiment will be described.
Focusing on the characteristic that the communicable distance becomes longer as the transmission rate is lower, the transmission antenna 6 is smaller by making the transmission rate of the return signal from the in-vehicle device 20 lower than the transmission rate of the transmission signal from the portable device 1. The shortage of the receivable distance on the portable device side can be supplemented with the increase in the transmittable distance on the in-vehicle device side. In addition, the portable device 1 can be made compact without significant changes by controlling the transmission rate on the in-vehicle device side.

  Since the portable device 1 includes the display unit 7 that displays the operation state information related to the vehicle-mounted control device based on the return signal from the vehicle-mounted device 20, it is easy for the occupant to check the operation state of the various control devices.

  The in-vehicle control device is divided into a first control device that operates from a short distance of the vehicle V and a second control device that operates from a distance farther than the first control device, and the first control device has a first transmission rate. Since the second control device can be operated with a third signal C having a third transmission rate lower than the first transmission rate, the response speed of the first control device can be increased. While ensuring, about 2nd control equipment, a communicable distance can be lengthened, without producing a feeling of delay to a passenger | crew.

  Further, since the first control device is the door lock mechanism 9, the slide door operation mechanism 10, and the window opening / closing mechanism 11, the response speed of the first control device operated from a short distance is ensured while the portable device 1 The receivable distance can be increased.

  In addition, since the second control device is the engine remote start mechanism 12, the vehicle position detection mechanism 13, and the vehicle state display mechanism 14, the response of the first control device without affecting the operation of the second control device. The receivable distance of the portable device 1 can be increased while securing the speed.

  Further, the in-vehicle device 20 returns the third signal C having the third transmission rate transmitted from the portable device 1 to the portable device 1 by using the fourth signal D having the fourth transmission rate lower than the third transmission rate. Since the signal is transmitted, the receivable distance of the portable device 1 can be increased while ensuring the response speed for both the first control device and the second control device.

Next, a modification in which the above embodiment is partially changed will be described.
1] In the above-described embodiment, an example in which two BPFs arranged in parallel with the vehicle-mounted device have been described, but at least as long as it transmits a return signal having a transmission rate lower than the transmission rate of the transmission signal, A single BPF may be used. Also, the number of different transmission rates that can control a plurality of in-vehicle control devices may be provided, and a single BPF can be configured by changing the cutoff frequency.

2] In the above embodiment, an example in which an antenna is used for both transmission and reception has been described. However, a transmitting antenna and a receiving antenna may be provided in a portable device and an in-vehicle device, respectively.

3] In the above-described embodiment, an example in which one type of second signal is incorporated in the first constituent signal of the first signal has been described. However, another second signal is included in the second and subsequent constituent signals of the first signal. It is also possible to incorporate signals.

4] In the above-described embodiment, the example in which the signal is transmitted once based on the operation of the operation button of the occupant has been described, but it is also possible to transmit the signal continuously a plurality of times by the operation of the operation button.

5) In addition, those skilled in the art can implement the present invention in various forms with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

It is a figure of the keyless entry system which concerns on the Example of this invention. It is an external view of the portable device which concerns on an Example. It is the table | surface which classified the vehicle-mounted control apparatus based on the distance from the vehicle which a passenger | crew operates a portable device. It is a related figure with operation of the operation button of a portable machine concerning an example, a transmission signal, and a return signal, (a) is the 1st signal, (b) is the 2nd signal, (c) is the 3rd signal, ( d) is a diagram showing a fourth signal. It is a flowchart of the transmission control process of the keyless entry system which concerns on an Example. It is a characteristic view of the bit rate of a transmission signal, and a communicable distance.

Explanation of symbols

V Vehicle S Keyless entry system 1 Portable device 4 Control units 5a to 5h Operation switch 6 Transmitting antenna 7 Display units 8a to 8h Operation button 9 Door lock mechanism 10 Slide door operation mechanism 11 Engine remote start mechanism 12 Engine remote start mechanism 13 Vehicle position Detection mechanism 14 Vehicle state display mechanism 20 In-vehicle device 21 Control unit 22 Receiving antenna

Claims (6)

A portable device carried by the occupant and an in-vehicle device capable of receiving a signal transmitted from the portable device, and the in-vehicle device operates the in-vehicle control device by receiving a predetermined signal transmitted from the portable device. In a possible keyless entry system,
The portable device has an output unit that outputs predetermined information based on a return signal from the in-vehicle device,
The in-vehicle device transmits a return signal to the portable device with a second signal having a second transmission rate lower than the first transmission rate, with respect to the first signal having the first transmission rate transmitted from the portable device. Keyless entry system characterized by that.   2. The keyless entry system according to claim 1, wherein the portable device includes a display unit that displays operation information regarding the in-vehicle control device based on a return signal from the in-vehicle device. The in-vehicle control device includes a first control device that operates from a short distance of the vehicle, and a second control device that operates from a distance farther than the first control device,
The first control device is operable with a first signal of the first transmission rate, and the second control device is operable with a third signal of a third transmission rate lower than the first transmission rate. The keyless entry system according to claim 1 or 2, characterized in that   The first control device includes at least one of a door lock unit that performs a lock / unlock operation of the vehicle door, a door operation unit that performs an open / close operation of the vehicle door, and a window opening / closing unit that performs an open / close operation of the vehicle door glass. The keyless entry system according to claim 3, wherein   The second control device includes engine remote start means for remotely starting the engine of the vehicle, vehicle position detection means capable of detecting the parking position of the vehicle, and vehicle state display means for displaying the state of the in-vehicle control device on the portable device. 5. The keyless entry system according to claim 3, wherein the keyless entry system is at least one of the above. The in-vehicle device transmits a return signal to the portable device by a fourth signal having a fourth transmission rate lower than the third transmission rate with respect to the third signal having the third transmission rate transmitted from the portable device. The keyless entry system according to any one of claims 3 to 5, wherein: