JP2023018910A - Mobile unit, communication control method, and control system - Google Patents

Abstract

To provide a mobile unit or the like, configured to suppress power consumption for reconnection when an established connection between the mobile unit and a control device for a vehicle is disconnected.SOLUTION: A mobile unit 10 includes: a transmitting/receiving unit 12 which transmits/receives radio signals to/from a control device 20 mounted on a vehicle CR; a storage unit 13 which stores a vehicle state received by the transmitting/receiving unit; and a control unit 11 which controls the transmitting/receiving unit and the storage unit. The radio signal is composed of a first packet for a connection between the control device and the transmitting/receiving unit, and a second packet for data transmission/reception after the connection. The storage unit 13 stores a vehicle state received through the second packet. When the transmitting/receiving unit fails in transmission/reception of the second packet, in the case where the vehicle state stored in the storage unit is a first state, the control unit controls the first packet to be received at a first duty ratio, and controls, in the case where the vehicle state stored in the storage unit is a second state, the first packet to be received at a second duty ratio.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a portable device for vehicles, a communication control method, and a control system.

2. Description of the Related Art Conventionally, techniques for reducing power consumption of a portable device (FOB) carried by a vehicle user are known. For example, Patent Literature 1 discloses a vehicle control device capable of notifying that a mobile device has been dropped at a location as close as possible to the location where the mobile device has been dropped while suppressing battery consumption of the mobile device. This vehicle control device outputs a code request signal for confirming whether or not the smart key is positioned within a predetermined range of the motorcycle in order to detect the dropping of the smart key for authorizing use of the motorcycle. A transmitting/receiving circuit that receives a code signal transmitted from the smart key that has received the code request signal, and a code collating circuit that performs code collation of the code signal received by the transmitting/receiving circuit. and a control unit that changes the transmission period of the code request signal in accordance with the running condition of the motorcycle.

Further, Patent Literature 2 discloses a vehicle control device capable of suppressing consumption of a battery of a portable device. This vehicle control device transmits a drop detection code request signal to the smart key in accordance with the vehicle speed at predetermined intervals to check whether the smart key is positioned within a predetermined range from the motorcycle. However, in the ON state of the communication system configured by the transmission/reception circuit for receiving the drop detection code signal transmitted from the smart key that received the drop detection code request signal, and the transmission/reception circuit and the smart key, the motorcycle is substantially and a control unit for stopping transmission of the drop detection code request signal by the transmitting/receiving circuit for each predetermined period when the apparatus is in a practically stopped state.

Further, Patent Document 3 discloses a vehicle authentication system capable of performing authentication processing even when the mobile device and the vehicle-mounted device are separated from each other and capable of suppressing power consumption in the mobile device. . Each of the authentication ECU and the portable device of this vehicle authentication system includes a UHF transmitter/receiver for transmitting/receiving UHF band signals. As an operation mode, the portable device has a periodic authentication mode in which the UHF transceiver is intermittently operated at predetermined periodic authentication intervals. While the operation mode is set to the periodical authentication mode, the portable device intermittently operates the UHF transceiver, and every time the UHF transceiver is activated, it performs processing for authenticating the vehicle-mounted device. Since the power supply to the UHF transmitter/receiver is cut off during the period in which the vehicle-mounted device is not authenticated, the power consumption of the portable device can be suppressed.

Further, Patent Document 4 discloses a straddle-type vehicle authentication system capable of suppressing power consumption while maintaining security, and suppressing an increase in the size of the straddle-type vehicle due to an increase in the size of the battery. . This straddle-type vehicle authentication system communicates with a power unit control unit that controls a power unit of the straddle-type vehicle, a portable device that is used to authenticate use of the straddle-type vehicle via wireless communication, and a portable device. Thus, an authentication control unit that authenticates the use of the straddle-type vehicle, and a main operation that receives an operation for switching the state of the authentication system to any one of the off state, the authentication confirmed state, and the power unit on state. and at least one of the elapsed time in the authentication confirmed state and the state of authentication executed by the authentication control unit in the authentication confirmed state. An access prevention part is provided.

Also, Patent Literature 5 discloses a smart key system for reducing battery consumption. The smart key system in sleep mode wakes up at regular intervals and first checks if there is a portable device near the vehicle. The smart key system receives authentication information from the portable device and authenticates the portable device only when the portable device is near the vehicle. Therefore, since the authentication operation is not performed when there is no portable device near the vehicle, the wake-up time is shortened and the dark current consumed by the vehicle is reduced. In addition, the smart key system wakes up faster, leaving a time margin for additional operations in sleep mode.

JP 2008-037125 A JP 2008-037126 A JP 2018-107653 A JP 2017-019362 A US Publication 2014/0176304

Wireless communication between the portable device and the vehicle-mounted device in the above-described conventional technology has mainly used LF (Low Frequency (long wave)) and UHF (Ultra High Frequency (ultra high frequency)), taking advantage of their respective characteristics. However, recently, in short-range wireless communication, Bluetooth (registered trademark), especially BLE (Bluetooth Low Energy), has been utilized in various devices, and its utilization is desired between portable devices and vehicle-mounted devices. there is

BLE communication includes communication using an advertisement channel for discovering/connecting devices before connecting to each other, and communication using a data channel for exchanging data between devices after connection is completed. In the advertisement channel, the peripheral device broadcasts an advertisement packet at each advertisement interval, and when the central device receives the advertisement packet broadcast as a result of scanning, it sends a connection request to the peripheral device, and both devices connect. be done. The advertisement interval is standardly 20 milliseconds to 10.24 seconds. The data channel is used to exchange data packets, and is transmitted and received at intervals of 7.5 milliseconds to 4 seconds according to the standard.

When BLE is used for wireless communication between portable devices and in-vehicle controllers, peripheral devices must constantly broadcast advertisement packets. An in-vehicle control device having an in-vehicle battery such as a lead-acid battery) is a peripheral, and a portable device having a relatively small power (button battery) is central. However, even if the portable device is a central device, it will consume a relatively large amount of power to scan for advertisement packets. In addition, since BLE uses radio waves in the 2.4 GHz band, even if a connection is established once, it may be disconnected due to the influence of the human body or interference with other electronic devices compared to LF. Then, communication is started on the advertisement channel for reconnection between the portable device and the in-vehicle control device, and power is consumed for broadcasting and scanning advertisement packets that do not exchange data.

SUMMARY OF THE INVENTION The present invention has been devised in view of such circumstances. A communication control method and a vehicle control system are provided.

In order to solve the above problems, there is provided a portable device carried by a vehicle user, comprising: a transmitter/receiver for transmitting/receiving radio signals to/from a control device mounted on the vehicle; and a memory for storing vehicle status received by the transmitter/receiver. and a control unit for controlling the transmission/reception unit and the storage unit. The wireless signal includes a first packet for establishing connection between the control device and the transmission/reception unit, and a second packet for transmitting/receiving data after connection. the storage unit stores the vehicle state received by the second packet; If the state of the vehicle is a second state different from the first state, the first packet is received at the first duty ratio. A portable device is provided that is controlled to receive at a second duty ratio different from the first duty ratio.
According to this, the state of the vehicle received when connected is stored, and when the connection is disconnected, the duty ratio for receiving the radio signal is changed for reconnection according to the state of the vehicle. Thus, there is provided a portable device that reduces power consumption for reconnection when the connection between the portable device and the control device for a vehicle is established and then disconnected.

Further, the first state may be a state in which the vehicle is running, the second state may be a state in which the vehicle is not running, and the first duty ratio may be smaller than the second duty ratio.
According to this, when the state of the vehicle is running, compared to when the vehicle is not running, the duty ratio for receiving the radio signal for reconnection is made smaller, thereby reducing the necessity of the vehicle while running. Reduces power consumption for low reconnection.

In order to solve the above-mentioned problems, the above-described portable device and a control device are provided, and when transmission/reception of the second packet fails, the control device detects when the state of the vehicle transmitted in the second packet is the first state. controls to transmit the first packet with the first duty ratio, and controls to transmit the first packet with the second duty ratio when the state of the vehicle transmitted with the second packet is the second state. A vehicle control system is provided.
According to this, the state of the vehicle received when connected is stored, and when the connection is disconnected, the duty ratio for receiving the radio signal is changed for reconnection according to the state of the vehicle. Thus, there is provided a vehicle control system that reduces power consumption for reconnection when a connection between a portable device and a vehicle control device is established and then disconnected.

In order to solve the above-mentioned problems, there is provided a method for controlling radio signal communication between a portable device carried by a vehicle user and a control device mounted on a vehicle, wherein the radio signal is used for connecting to the control device. 1 packet and a second packet for transmitting and receiving data after connection. A radio signal indicating the state of the vehicle is received from the control device by the second packet, and the received state of the vehicle is stored. When transmission/reception of two packets fails and the stored state of the vehicle is the first state, control is performed so that the first packet is received at the first duty ratio, and the stored state of the vehicle is the first state. is a different second state, there is provided a communication control method for controlling reception of the first packet with a second duty ratio different from the first duty ratio.
According to this, the state of the vehicle received when connected is stored, and when the connection is disconnected, the duty ratio for transmitting the radio signal for reconnection is changed according to the state of the vehicle. Therefore, there is provided a communication control method for reducing power consumption for reconnection when the connection between the portable device and the control device for the vehicle is established and then disconnected.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, a portable device, a communication control method, and a method for reducing power consumption for reconnection when the connection between the portable device and the control device for a vehicle is established and then disconnected. and a vehicle control system.

1 is a block configuration diagram of a vehicle control system according to a first embodiment of the present invention; FIG. FIG. 4 is an explanatory diagram for explaining exchange of signals in an advertisement channel between a control device and a portable device in the vehicle control system according to the first embodiment of the present invention; FIG. 4 is a flowchart showing processing of the control device and the portable device in the vehicle control system of the first embodiment according to the present invention; 4 is a flowchart showing parameter update processing in the control device according to the first embodiment of the present invention; 4 is a flow chart showing communication state determination processing in the control device and the portable device according to the first embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
<First embodiment>
A vehicle control system 100 according to the present embodiment will be described with reference to FIGS. 1 to 5. FIG. The vehicle control system 100 comprises, as shown in FIG. The vehicle CR is a vehicle for traveling on roads, such as a (four-wheeled) automobile, a two-wheeled motor vehicle (motorcycle), and a motorized bicycle. In this embodiment, a motorcycle will be described as an example.

The portable device 10 may be a portable device having a function of communicating with the control device 20, and may be a dedicated key fob (FOB) for the vehicle CR, or a general-purpose portable terminal such as a smart phone. The portable device 10 includes a transmitting/receiving unit 12 that transmits/receives radio signals to/from a control device 20, a control unit 11 that controls the entire portable device 10, and various data/programs received by the transmitting/receiving unit 12, such as the state of the vehicle. It comprises a storage unit 13 for temporary/short-term storage, an operation unit 14 for the user to operate, and a power source (not shown) for supplying power to them. The control unit 11 is a so-called CPU (Central Processing Unit) or MPU (Micro-processing Unit). The storage unit 13 is a ROM (Read Only Memory), a RAM (Random Access Memory), or the like. A key fob does not have a very large memory, but a smart phone has a large memory. In the case of a key fob, the operation unit 14 is often a push button, but in the case of a smartphone, it is a button or the like displayed on a touch screen. The power source mounted on the portable device 10 is a relatively small-capacity button battery for a key fob, and a relatively large-capacity lithium-ion battery for a smartphone. The transmission/reception unit 12 will be described later.

The control device 20 is supplied with power from a battery (not shown) provided in the vehicle CR, and includes an engine and motor driving device 25 for driving the vehicle, a control mechanism (not shown) corresponding to a steering wheel, etc. It is an ECU (Electric Control Unit) appropriately connected to devices/equipment of the indicator 24 such as gauges indicating the state of the vehicle CR. The control device 20 includes an in-vehicle transmission/reception unit 22 for transmitting/receiving radio signals to/from the transmission/reception unit 12 of the portable device 10, an in-vehicle control unit 21 for overall control of the control device 20, and long-term/short-term storage of data/programs. An in-vehicle storage unit 23 is provided. The in-vehicle control unit 21 is a so-called CPU or MPU, and the in-vehicle storage unit 23 is a ROM, a RAM, or the like.

The in-vehicle transmitting/receiving unit 22 and the transmitting/receiving unit 12 perform wireless communication according to the BLE standard, which is one of short-range wireless communication technologies. BLE communication includes communication using an advertisement channel for discovering/connecting devices before connecting to each other, and communication using a data channel for exchanging data between devices after connection is completed. In the advertisement channel, the peripheral device broadcasts an advertisement packet at each advertisement interval, and when the central device receives the advertisement packet broadcast as a result of scanning, it sends a connection request to the peripheral device, and both devices connect. be done. In this specification, the packet in the advertisement channel is also called the first packet. When both devices are connected, information is exchanged between them at predetermined intervals on the data channel on the signals from the central and the signals from the peripherals, enabling two-way communication. In this specification, a packet in the data channel is also called a second packet. A radio signal transmitted/received between the in-vehicle transmitting/receiving unit 22 and the transmitting/receiving unit 12 is composed of a first packet for establishing connection between the control device 20 and the portable device 10 and a second packet for transmitting/receiving data after the connection.

When both devices are in a connected state and are performing two-way communication, data packets are exchanged on the data channel at predetermined intervals. If data packets cannot be exchanged at predetermined intervals due to, for example, the distance between the two devices while the two devices are in the connected state, the two devices are in the disconnected state. It is appropriately determined whether the disconnection state is established when one data packet exchange fails or the disconnection state occurs when a predetermined number of consecutive failures occur. Once disconnected, in order to reconnect both devices, the peripheral device must broadcast an advertisement packet at each advertisement interval using the advertisement channel as described above, and the central device must scan. There is In this way, when both devices are disconnected after being in a connected state, it is necessary to exchange advertisement packets without exchanging data in order to reconnect, which consumes power. Note that the advertisement interval is 20 milliseconds to 10.24 seconds according to the standard. In the data channel, data packets are exchanged and transmitted and received at intervals of 7.5 milliseconds to 4 seconds according to the standard.

Either the in-vehicle transceiver 22 or the transceiver 12 may be central or peripheral. Peripheral devices need to constantly broadcast advertisement packets. Therefore, when emphasizing suppression of power consumption, the in-vehicle transceiver unit 22 having a relatively large amount of power (in-vehicle battery such as a lead-acid battery) is used as a peripheral. The transmitting/receiving section 12 on the side of the portable device 10 having a relatively small power (button battery) serves as the central. In this embodiment, the in-vehicle transmitter/receiver 22 will be described as a peripheral, and the transmitter/receiver 12 as a central.

FIG. 2 shows the exchange of signals in the advertisement channel between the control device 20 and the portable device 10. As shown in FIG. In this figure, the central portable device 10 performs scanning, and the peripheral vehicle-mounted control device 20 broadcasts an advertisement packet. This figure (A) shows that the portable device 10 scans in 200 ms and repeats the scan after an interval of 10 ms. When the portable device 10 performs such scanning, there is a high possibility that it will receive an advertisement packet from the vehicle-mounted control device 20 , and the connection request can be transmitted immediately.

On the other hand, (B) of the figure shows that the portable device 10 scans in 50 ms and repeats the scan after an interval of 100 ms. When the portable device 10 performs such scanning, the probability of receiving an advertisement packet from the on-board control device 20 becomes low, and it is difficult to transmit a connection request. It will take some time. Comparing the scan of FIG. 1A with the scan of FIG. Therefore, when scanning is performed with a large duty ratio, connection is likely to occur, and when scanning is performed with a small duty ratio, connection is difficult. However, scanning with a large duty ratio consumes more power for connection than scanning with a small duty ratio.

In addition, FIG. 1(C) indicates that scanning is started with a trigger such as turning on the switch of the portable device 10 and ends after 200 ms has elapsed. In this way, scanning is not continuously repeated, but is started based on some trigger, and scanning is performed only for a predetermined period of time, so that power consumption in the advertisement channel can be suppressed.

FIG. 3 shows processing of the in-vehicle control device 20 and the portable device 10 . In this figure, it is assumed that the portable device 10 performs scanning for a predetermined period from when the switch of the operation unit 14 is operated at the time of boarding, as described with reference to FIG. 2(C). During this predetermined period, it is preferable that the portable device 10 and the vehicle-mounted controller 20 are connected quickly and smoothly at the time of boarding, so scanning is preferably performed with a relatively large duty ratio. In this specification, a relatively large duty ratio is called a second duty ratio, and a relatively small duty ratio is called a first duty ratio.

First, the in-vehicle transceiver 22 of the peripheral periodically broadcasts advertisement packets (Adv). On the other hand, when the switch of the operation unit 14 of the portable device 10 is operated (turned on) by the wearer in order to board the vehicle CR, the control unit 11 causes the transmission/reception unit 12 to perform scanning at the second duty ratio. Control. Since the portable device 10 scans with a relatively large duty ratio, it becomes easier to receive an advertisement packet from the vehicle-mounted control device 20, and upon reception, transmits a connection request. As a result, somewhat large power consumption is used, but since the portable device 10 does not repeat scanning, the power consumption can be minimized. It is assumed that the engine, which is the driving device 25 at this time, is in an idling state, and that the in-vehicle control unit 21 has received notification that the engine is in an idling state.

When the portable device 10 transmits a connection request, the portable device 10 and the in-vehicle control device 20 enter a connected state, and start exchanging information with each other through two-way communication data packets (second packets). The in-vehicle control device 20 exchanges information that the engine is in an idle state, and the portable device 10 exchanges its own identification information. Then, the in-vehicle transmitting/receiving unit 22 authenticates the identification information of the portable device 10, and if it succeeds, it transmits to the in-vehicle control unit 21, and the in-vehicle control unit 21 follows it and controls the driving device 25 to permit the starting. conduct. On the other hand, the transmitting/receiving section 12 of the portable device 10 notifies the control section 11 that the engine is in the idle state, and the control section 11 causes the storage section 13 to store the state (idle state) of the driving device 25 of the vehicle CR. That is, the storage unit 13 stores the state of the vehicle CR received by the data packet (second packet).

The vehicle CR is allowed to start and is in a stopped state (stopped state) although it can run, and the state is notified to the on-vehicle control part 21, and the state is transmitted to the portable device 10 by regular data packets. . The portable device 10 that has received the notification that it is in the stop state performs two-way communication reconnection parameter update processing (1). The bidirectional communication reconnection parameter update process is shown in FIG. In the two-way communication reconnection parameter update process, the control unit 11 checks in S100 whether or not the engine state has changed. That is, the engine status received by the data packet this time is compared with the engine status received by the previous data packet and stored in the storage unit 13 to check whether it is the same as the stored engine status. If there is no change, no special processing is performed. Note that S in the flow chart means a step.

Here, since there is a change from the idle state to the stopped state, the control section 11 confirms the changed engine state in S102. Since the engine state after the change is the stop state (while the vehicle is stopped), the new engine state is stored in the storage unit 13, and the parameters for reconnection are set in S106. The parameters for reconnection are the duration and interval of scanning performed by the portable device 10, and the scanning time is set to 200 ms, and the scanning interval is set to 10 ms. This parameter is a second duty ratio that is greater than the parameter during running, which will be described later.

In FIG. 3, it is assumed that the vehicle CR is now in a running state. In this specification, the running state is called the first state, and the states other than the running state (idle state, stop state, etc.) are called the second state. This running state is notified to the in-vehicle control unit 21, and the state is transmitted to the portable device 10 by regular data packets. The portable device 10 that has received the notification that it is in a running state performs two-way communication reconnection parameter update processing (2). The control unit 11 similarly confirms that there has been a change in the engine state at S100, and confirms that the vehicle is running at S102. Then, the control unit 11 stores the new engine state (driving state) in the storage unit 13, and in S104 sets the parameters for reconnection: scan time: 50 ms, scan interval: 100 ms. This parameter has a duty ratio that is smaller than the duty ratio in the idle state or stop state.

Next, FIG. 3 shows a state in which reception of a regular data packet fails once for some reason. In this case, the in-vehicle control device 20 performs communication state determination (1), and the portable device 10 performs communication state determination (2). As shown in FIG. 5, the communication state determination is made based on whether the two-way communication fails for a specified period of time, that is, whether the periodic data packet reception fails more than a predetermined number of times. As shown in FIG. 5, communication status judgments (1) and (2) fail only once at this stage. It is determined to be in a connected state.

FIG. 3 then shows the state of consecutive failures in receiving periodic data packets. Then, the in-vehicle control device 20 performs communication state determination (3), and the portable device 10 performs communication state determination (4). In communication state determinations (3) and (4), as shown in FIG. 5, two-way communication fails twice in succession in S200, and the predetermined time has elapsed, so "YES" is determined. It is determined that there is In this embodiment, the predetermined number of times of non-delivery is two.

In the disconnected state, the in-vehicle control unit 21 controls the in-vehicle transmission/reception unit 22 to transmit an advertisement packet for reconnection, and the control unit 11 of the portable device 10 controls the transmission/reception unit 12 to scan. do. Since the storage unit 13 stores that the vehicle CR is in the running state, the scan at this time has a smaller duty ratio than the scan in the idling state or the stopped state. Then, in the running state (first state), the power consumption of the portable device 10 is suppressed, although connection becomes more difficult than in the idle state or stop state (second state).

In the first place, when the vehicle CR is running, the person carrying the portable device 10 is concentrating on driving, and there is little need to operate the portable device 10 to control the vehicle CR. This tendency is particularly strong when the vehicle CR is a motorcycle, and it is preferable to reduce power consumption as much as possible rather than using a large amount of power for connection. On the other hand, although the duty ratio is small, scanning is performed. Therefore, if scanning is performed at the timing when an advertisement packet from the vehicle-mounted control device 20 arrives, it can be received, a connection request can be transmitted, and connection can be reestablished.

As described above, the control unit 11 of the portable device 10 changes the state of the vehicle stored in the storage unit 13 to the running state (first state) when the transmission/reception unit 12 fails to transmit/receive the data packet (second packet). , control is performed so that the advertisement packet (first packet) is received at a relatively small first duty ratio, and the state of the vehicle stored in the storage unit 13 is an idle state different from the running state. or in the stop state (second state), control is performed so that the advertisement packet (first packet) is received with a second duty ratio, which is relatively large, unlike the first duty ratio.

In this way, the state of the vehicle CR received when connected is stored, and when the connection is disconnected, the duty ratio for receiving the radio signal for reconnection is changed according to the state of the vehicle CR. Thus, it is possible to provide the portable device 10 that reduces power consumption for reconnection when the connection between the portable device 10 and the in-vehicle control device 20 is established and then disconnected. Further, as in this embodiment, by making the duty ratio (first duty ratio) in the running state (first state) smaller than the duty ratio (second duty ratio) in other states (second state), It is possible to reduce the power consumed for reconnection that is not necessary while driving.

Also, what has been described above is the method of controlling communication of radio signals with the control device 20 in the portable device 10 carried by the user of the vehicle CR. In this communication control method, the radio signal is composed of an advertisement packet (first packet) for connecting with the control device 20 and a data packet (second packet) for transmitting and receiving data after connection. , a radio signal indicating the state of the vehicle CR is received from the control device 20 in the form of a data packet, and the received state of the vehicle CR is stored. If the stored state of the vehicle CR is an idle state or a stop state (second state) different from the running state, control is performed to receive the advertisement packet at a first duty ratio. is controlled to receive the advertisement packet with a second duty ratio different from the first duty ratio.

In this way, the state of the vehicle CR received when connected is stored, and when the connection is disconnected, the duty ratio for receiving the radio signal for reconnection is changed according to the state of the vehicle CR. Therefore, it is possible to provide a communication control method that reduces power consumption for reconnection when the connection between the portable device 10 and the control device 20 is established and then disconnected.

Furthermore, in response to the portable device 10 that performs such scanning, the control device 20 sends a data packet (second packet) to the portable device 10 when transmission/reception of the data packet (second packet) fails. When the state of the vehicle CR is in the running state (first state), control is performed so that the advertisement packet (first packet) is transmitted with a relatively small first duty ratio, and the data packet (second packet) is a state (second state) other than the running state, the advertisement packet (first packet) is transmitted with a relatively large second duty ratio. It may be controlled. In this way, the state of the vehicle CR received when connected is stored, and when disconnected, the duty ratio for transmitting the radio signal for reconnection is changed according to the state of the vehicle CR. Thus, it is possible to provide the vehicle control system 100 that reduces the power consumption of the portable device 10 for reconnection when the connection between the portable device 10 and the in-vehicle control device 20 is established and then disconnected.

It should be noted that the present invention is not limited to the exemplified embodiments, and can be implemented with a configuration that does not deviate from the content described in each item of the claims. That is, although the present invention has been particularly illustrated and described primarily with respect to particular embodiments, there may be modifications, quantities, Various modifications can be made to other detailed configurations by those skilled in the art.

REFERENCE SIGNS LIST 100 vehicle control system 10 portable device 11 control unit 12 transmission/reception unit 13 storage unit 14 operation unit 20 control device 21 on-vehicle control unit 22 on-vehicle transmission/reception unit 23 on-vehicle storage unit 24 display device 25 driving device CR vehicle

Claims (4)

A portable device carried by a vehicle user,
a transmitting/receiving unit that transmits/receives a wireless signal to/from a control device mounted on the vehicle;
a storage unit that stores the state of the vehicle received by the transmission/reception unit;
a control unit that controls the transmitting/receiving unit and the storage unit;
with
The radio signal is composed of a first packet for establishing connection between the control device and the transmitting/receiving unit, and a second packet for transmitting/receiving data after connection,
The storage unit stores the state of the vehicle received by the second packet,
The control unit, when the transmission/reception unit fails to transmit/receive the second packet,
controlling to receive the first packet at a first duty ratio when the state of the vehicle stored in the storage unit is the first state;
When the state of the vehicle stored in the storage unit is a second state different from the first state, control is performed to receive the first packet at a second duty ratio different from the first duty ratio. ,
portable machine. The first state is a state in which the vehicle is running,
the second state is a state in which the vehicle is not running;
wherein the first duty ratio is smaller than the second duty ratio;
2. The portable device according to claim 1, wherein: Equipped with the portable device according to claim 1 or 2 and the control device,
When the transmission and reception of the second packet fails, the control device
controlling to transmit the first packet at a first duty ratio when the state of the vehicle transmitted in the second packet is the first state;
controlling to transmit the first packet at a second duty ratio when the state of the vehicle transmitted in the second packet is the second state;
Vehicle control system. A method for controlling communication of radio signals between a portable device carried by a user of a vehicle and a control device mounted on the vehicle,
The radio signal is composed of a first packet for connecting with the control device and a second packet for transmitting and receiving data after connection,
receiving a radio signal indicating the state of the vehicle by the second packet from the control device;
storing the vehicle status received;
When transmission/reception of the second packet fails,
controlling to receive the first packet at a first duty ratio when the stored state of the vehicle is the first state;
controlling to receive the first packet at a second duty ratio different from the first duty ratio when the stored state of the vehicle is a second state different from the first state;
Communication control method.

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