JP2009019378A - In-vehicle device remote control system and in-vehicle device remote control device - Google Patents

Abstract

An in-vehicle device remote control system capable of reliably preventing two-way communication between a vehicle-side device and a portable device, and reliably preventing two-way communication between the portable device and the portable device. An in-vehicle device remote control device capable of performing the above is provided.
Periodic noise demodulated by a receiving unit is detected to learn a timing at which no noise occurs, and a timing notification signal Tm is generated when a period in which no noise occurs is reached. When the signal generation unit 112 acquires the timing notification signal Tm generated by the timing learning unit 111, the signal generation unit 112 generates a modulation signal Ms including a code. The modulation signal Ms generated by the signal generation unit 112 is converted into a vehicle-side transmission signal Cs and wirelessly transmitted to the portable device 12.
[Selection] Figure 1

Description

  The present invention relates to an in-vehicle device remote control system for performing bi-directional communication between a vehicle-side communication device and a portable device and remotely controlling a device mounted on a moving body such as an automobile, and a bi-directional communication with a portable device. The present invention relates to an in-vehicle device remote control device for remotely controlling a device mounted on a moving body such as an automobile.

  In recent years, remote control systems for in-vehicle devices that remotely control the unlocking of doors and trunks of mobile objects such as automobiles, whether to start the engine, and the locked state of the steering wheel by interactively communicating with portable devices owned by passengers. Is popular. Such an in-vehicle device remote control system is generally known as a smart key system (registered trademark).

  In-vehicle device remote control systems generally perform two-way communication using weak radio waves. For this reason, the in-vehicle device remote control system has a problem that communication is often disturbed due to the influence of external noises emitted from other devices, and various conventional methods have been proposed to solve this problem. Technology has been devised.

  FIG. 6 shows the configuration of the vehicle door remote control device 90 described in Patent Document 1 designed to reduce the possibility of communication interruption in consideration of the influence of external noise emitted from other devices. It is a block diagram.

  A vehicle door remote control device 90 shown in FIG. 6 includes a vehicle side device 91 and a portable device 92. The vehicle-side device 91 includes a transmitter 911, a receiver 912, a CPU 913, a door lock mechanism 914, a trunk lock mechanism 915, an engine control device 916, and a steering lock mechanism 917.

  The transmitter 911 transmits a request signal generated by a modulation unit (not shown) to the portable device 92 based on an instruction from the CPU 913. The receiver 912 receives a response signal transmitted from the portable device 92 in response to the request signal transmitted from the transmitter 911.

  The CPU 913 determines whether or not a response signal transmitted from the portable device 92 has been received according to the request signal, and performs control processing to switch the output level of the request signal. Further, the CPU 913 performs an authentication process for determining whether or not the vehicle ID code included in the transmitted request signal and the ID code included in the response signal transmitted from the portable device 92 match each other. When the CPU 913 performs the authentication process and determines that the mutual ID codes match, the CPU 913 places the door lock mechanism 914 and the trunk lock mechanism 915 into the unlocking preparation state. Further, after the passenger gets on, if the authentication process is performed again and it is determined that the ID codes match each other, the engine controller 916 is instructed to cancel the engine start prohibition state, and at the same time, the steering of the steering lock mechanism 917 Instruct to release the locked state.

  Next, the control process of the CPU 913 described above will be described in more detail. In the control process of the CPU 913, the noise level around the vehicle is detected, and the degree of interference in bidirectional communication between the vehicle side device 91 and the portable device 92 is estimated. Then, the CPU 913 switches the output level of the request signal transmitted from the transmitter 911 based on the estimated interference.

  Therefore, in the control process of the CPU 913, the noise level is first detected. The CPU 913 determines whether the signal pattern received by the receiver 912 within a predetermined period after the request signal is transmitted from the transmitter 911 is different from the response signal pattern transmitted from the portable device 92. Judgment is made, and a signal having a pattern different from the pattern of the response signal is regarded as noise, and the level is detected.

  Next, the CPU 913 determines the degree of interference based on the level of the signal regarded as noise. More specifically, the CPU 913 compares the level of the signal regarded as noise with a first predetermined value and a second predetermined value that is smaller than the first predetermined value. Then, the CPU 913 estimates that the degree of interference is “high” when the level of the signal regarded as noise exceeds the first predetermined value. Further, the CPU 913 estimates that the degree of interference is “medium” when the level of the signal regarded as noise exceeds the first predetermined value and exceeds the second predetermined value. Further, the CPU 913 estimates that the interference level is “low” when the level of the signal regarded as noise is equal to or lower than the second predetermined value.

  Then, the CPU 913 switches the output level of the request signal transmitted from the transmitter 911 based on the estimated interference. More specifically, the request signal output from the transmitter 911 has first to third transmission patterns having transmission intervals and output levels different from each other, and the CPU 913 determines whether the request signal is based on the estimated degree of interference. By changing the transmission pattern of the request signal to any one and transmitting it, the output level of the request signal is switched.

  Here, the relationship between the output levels of the first to third transmission patterns will be described. The output level of the second transmission pattern is higher than the output level of the first transmission pattern. The output level of the third transmission pattern is smaller than the output level of the first transmission pattern.

Therefore, when the CPU 913 estimates that the degree of interference is “large”, the CPU 913 causes the transmitter 911 to transmit the request signal of the second transmission pattern. Further, when the CPU 913 estimates that the interference level is “medium”, the CPU 913 causes the transmitter 911 to transmit a request signal of the first transmission pattern. Further, when the CPU 913 estimates that the degree of interference is “low”, the CPU 913 causes the transmitter 911 to transmit a request signal of the third transmission pattern.
JP 2005-325540 A

  However, the above prior art has the following problems. In the above prior art, the level of the request signal transmitted from the transmitter 911 and the transmission interval are switched based on the degree of interference, that is, the noise level. Therefore, according to the conventional technology, the possibility that the portable device 92 can receive the request signal transmitted from the transmitter 911 may be improved.

  However, in the above-described conventional technology, it is unavoidable that the receiver 912 receives a signal in which the response signal transmitted from the portable device 92 and ambient noise are mixed. In general, a signal received by the receiver 912 is demodulated by a demodulation circuit (not shown) provided at a subsequent stage of the receiver 912. However, when the receiver 912 receives an interfering signal, the signal demodulated by the demodulation circuit is not a normal signal. In other words, in the above-described prior art, it is impossible to reliably prevent the two-way communication between the vehicle-side device and the portable device from being disturbed by surrounding noise.

  In order to solve the above-described problems of the prior art, the present invention avoids interference between a signal transmitted from a portable device and surrounding noise, and bidirectional communication between the vehicle-side device and the portable device is caused by the surrounding noise. It is an object of the present invention to provide an in-vehicle device remote control system and an in-vehicle device remote control device that can reliably prevent obstruction.

  In order to solve the above problems, the present invention has the following features.

  1st invention is a vehicle-mounted apparatus remote control system provided with a portable device and the vehicle side communication apparatus which can communicate with the said portable device, Comprising: A vehicle side communication apparatus receives the signal containing the noise which generate | occur | produces periodically And an instruction means for instructing the portable device to transmit the portable transmission signal during a period in which no noise is generated based on a prediction result of the noise generation period based on the reception result of the noise by the receiving means. The portable device is a vehicle-mounted device remote control system that transmits a portable-side signal in response to an instruction from the instruction means.

  In a second aspect based on the first aspect, the vehicle-side communication device determines the instruction timing of the instruction means based on the prediction result so that the portable device transmits the portable-side transmission signal during a period in which noise does not occur. Timing determining means is further provided, and when the instruction timing arrives, the instruction means transmits a vehicle-side transmission signal instructing the portable device to transmit a portable-side transmission signal, and the portable device receives the vehicle-side transmission signal. In response to this, a mobile side transmission signal is transmitted.

  In a third aspect based on the first aspect, the vehicle-side communication device further includes timing information generating means for generating timing information indicating a period in which noise is not generated based on the prediction result, and the instruction means includes the timing information. The vehicle-side transmission signal is transmitted, and the portable device transmits the portable-side transmission signal during a period indicated by the timing information included in the vehicle-side transmission signal.

  In a fourth aspect based on the second aspect, the timing determining means determines a timing at which the noise is predicted to be generated based on the received noise generation start timing when the receiving means receives the noise a predetermined number of times. A first calculating means for calculating, and a second calculating means for calculating the longest occurrence time of the received noises when the noise is received a predetermined number of times by the receiving means; And a predicting means for predicting a noise occurrence period based on the timing calculated by the first calculating means and the longest occurrence time calculated by the second calculating means.

  In a fifth aspect based on the fourth aspect, the timing determining means is configured such that the interval from the start timing of the noise predicted to occur next to the transmission start timing of the mobile-side transmission signal is longer than the longest occurrence time, and The interval from the start timing of the noise that is predicted to occur next to the transmission completion timing of the mobile-side transmission signal is the start timing of the noise that is predicted to be generated next from the start timing of the noise that is predicted to be generated next The transmission start timing is determined so as to be shorter than the interval until.

  In a sixth aspect based on the fifth aspect, the timing determining means determines the transmission start timing so that the vehicle-side transmission signal is transmitted within the predicted noise generation period.

  A seventh invention is an in-vehicle device remote control device capable of communicating with a portable device, wherein a receiving means for receiving a signal including periodically generated noise, and a noise generation period based on a reception result of the noise by the receiving means Instructing means for instructing the portable device to transmit the portable-side transmission signal during a period in which noise does not occur.

  According to the present invention, it is possible to avoid interference between a signal transmitted from a portable device and surrounding noise, and reliably prevent two-way communication between the vehicle-side device and the portable device due to surrounding noise. It is possible to provide an in-vehicle device remote control system that can reliably prevent two-way communication with a portable device from being disturbed by ambient noise.

(First embodiment)
FIG. 1 is a block diagram showing a configuration of an in-vehicle device remote control system 10 according to the first embodiment of the present invention. The in-vehicle device remote control system 10 includes a vehicle side communication device 11 and a portable device 12.

  The vehicle-side communication device 11 communicates with the portable device 12 by wirelessly transmitting a vehicle-side transmission signal Cs. The portable device 12 communicates with the vehicle-side communication device 11 by wirelessly transmitting the portable-side transmission signal Ps. That is, the vehicle side communication device 11 and the portable device 12 perform two-way communication by transmitting and receiving the vehicle side transmission signal Cs and the portable side transmission signal Ps to each other. Note that the in-vehicle device remote control device described in the claims corresponds to, for example, the vehicle-side communication device 11 in the present embodiment.

  And the vehicle side communication apparatus 11 produces | generates the confirmation code for judging whether the portable device 12 exists in the range set beforehand, and periodically transmits the vehicle side transmission signal Cs containing the produced | generated code | cord | chord. Wireless transmission. When the portable device 12 enters the preset range and receives the vehicle-side transmission signal Cs including the confirmation code from the vehicle-side communication device 11, the portable device 12 generates a response code according to the received confirmation code. The mobile-side transmission signal Ps including the generated code is wirelessly transmitted. When the vehicle-side communication device 11 receives the portable-side transmission signal Ps including the response code from the portable device 12, the vehicle-side communication device 11 further performs two-way communication with the portable device 12 for authentication processing. And the vehicle side communication apparatus 11 will permit operation of the vehicle equipment by the holder of the portable apparatus 12, if the authentication process with the portable apparatus 12 is completed normally.

  In addition to the portable transmission signal Ps wirelessly transmitted from the portable device 12, the vehicle-side communication device 11 receives periodic noise generated from the surroundings. And the vehicle side communication apparatus 11 calculates the average period of this periodic noise, and the maximum value of the generation | occurrence | production period per period, and learns the timing which noise does not arise. The vehicle-side communication device 11 performs two-way communication with the portable device 12 during a period in which no noise occurs by wirelessly transmitting the vehicle-side transmission signal Cs including the above-described confirmation code and other various codes based on the learned timing. Thus, the mutual communication can be prevented from being interrupted. In the present invention, the frequency of the vehicle-side transmission signal Cs transmitted by the vehicle-side communication device 11 and the frequency of the portable-side transmission signal Ps transmitted by the portable device 12 are different from each other. Further, it is assumed that the frequency of the portable transmission signal Ps transmitted by the portable device 12 and the frequency of periodic noise generated from the surroundings are substantially the same frequency. Therefore, according to the present invention, it is possible to prevent the mobile communication signal Ps transmitted from the mobile device 12 from interfering with the periodic noise generated from the surroundings and disturbing the bidirectional communication of the in-vehicle device remote control system 10. There must be.

  Next, a more detailed operation of the vehicle side communication device 11 will be described with reference to FIG. The vehicle-side communication device 11 includes a timing learning unit 111, a signal generation unit 112, a reception unit 113, and a transmission unit 114. The ECU 115 includes a timing learning unit 111 and a signal generation unit 112.

  The timing learning unit 111 detects a noise component included in the demodulated signal Ds demodulated by the receiving unit 113 and performs a learning process for learning a timing at which noise does not occur. This learning process is to predict a noise generation period based on the detected result and to specify a period during which noise does not occur. The timing learning unit 111 determines that noise has been detected when it detects an unrecognizable code among the codes included in the demodulated signal Ds. In addition, the timing learning unit 111 generates a timing notification signal Tm that notifies the signal generation unit 112 of the timing for transmitting the next code based on the code included in the demodulated demodulated signal Ds. The timing notification signal Tm includes information (hereinafter referred to as transmission code information) for notifying the type of code to be transmitted next to the portable device 12 in accordance with the code included in the demodulated signal Ds. The learning process of the timing learning unit 111 will be described later.

  When the signal generation unit 112 acquires the timing notification signal Tm generated by the timing learning unit 111, the signal generation unit 112 generates a modulation signal Ms including a code corresponding to transmission code information included in the timing notification signal Tm. The type of code included in the modulation signal Ms includes a confirmation code for determining whether or not the portable device 12 is present in a preset communication range, a vehicle ID registered in the vehicle-side communication device 11 and a mobile phone. There are an ID code for determining whether or not the vehicle ID registered in the machine 12 matches, and an encryption code for determining whether or not the portable machine 12 has been illegally copied.

  The receiving unit 113 receives the portable transmission signal Ps transmitted from the portable device 12, demodulates the received signal, and generates a demodulated signal Ds. The receiving unit 113 also receives periodic noise generated from the surroundings together with the mobile-side transmission signal Ps. Therefore, the demodulated signal Ds generated by the receiving unit 113 includes a code and noise obtained by demodulating the portable transmission signal Ps.

  The transmission unit 114 converts the modulated signal Ms generated by the signal generation unit 112 into a wireless signal, and wirelessly transmits the converted wireless signal to the portable device 12 as a vehicle-side transmission signal Cs. In addition, when the portable device 12 receives the vehicle-side transmission signal Cs, the portable device 12 transmits the portable-side transmission signal Ps after a predetermined period has elapsed as described later. Thus, the portable device 12 transmits the portable side transmission signal Ps according to the vehicle side transmission signal Cs. That is, the vehicle-side transmission signal Cs is a signal that instructs the portable device 12 to transmit the portable-side transmission signal Ps.

  Next, the learning process of the timing learning unit 111 will be described in detail. FIG. 2 is a diagram illustrating the demodulated signal Ds when the receiving unit 113 receives the portable transmission signal Ps transmitted from the portable device 12 and periodic noise. In FIG. 2, Da to Dd indicate codes included in the demodulated signal Ds. In FIG. 2, Na to Nd indicate noise included in the demodulated signal Ds. FIG. 2 shows a demodulated signal Ds in which noises Na to Nd are superimposed on the demodulated codes Da to Dd, respectively. FIG. 2 shows a demodulated signal Ds including four codes Da to Dd and four noises Na to Nd. However, the receiving unit 113 continues to generate codes and codes after the period shown in FIG. It goes without saying that noise is received.

  In FIG. 2, Tpa to Tpc indicate periods from detection of noise to detection of the next noise (hereinafter referred to as noise intervals). Further, Tna to Tnd indicate respective noise generation periods.

  The timing learning unit 111 detects the noise interval of the noise included in the demodulated signal Ds and the noise generation period, and learns the average value Tpk of Tpa to Tpc and the maximum value Tnk of Tna to Tnd. Then, the timing learning unit 111 stores the learned average value Tpk and the maximum value Tnk in a storage unit (not shown).

  Note that the average value Tpk can be used for predicting the next generation timing of noise on the basis of the time when the timing learning unit 111 detects the rise of noise. The maximum value Tnk is the longest occurrence time of one noise among periodic noises. Therefore, the timing learning unit 111 can predict the noise generation period using the average value Tpk and the maximum value Tnk.

  Further, the number of noise samples when the timing learning unit 111 learns the average value Tpk and the maximum value Tnk is not limited to four as shown in FIG. 2, and may be three or less. Needless to say, it may be 5 or more.

  Next, the learning process procedure of the timing learning unit 111 will be described more specifically. FIG. 3 is a flowchart showing the learning process of the timing learning unit 111.

  In step S101, the timing learning unit 111 initializes the count number k to zero. When the timing learning unit 111 completes the process of step S101, the process proceeds to step S102. In step S102, the timing learning unit 111 detects noise included in the demodulated signal Ds, and stores the noise interval and the generation period in a storage unit (not shown). When completing the process of step S102, the timing learning unit 111 advances the process to step S103. In step S103, the timing learning unit 111 determines whether or not the number of stored sets of noise intervals and generation periods, that is, the count number k is equal to or greater than a predetermined number of samples. In step S103, when the timing learning unit 111 determines that the number of sets of the stored noise interval and generation period is equal to or greater than a predetermined number of samples, the process proceeds to step S104. On the other hand, when the timing learning unit 111 determines in step S103 that the count number k is not greater than or equal to the predetermined number of samples, the process proceeds to step S106. In step S104, the timing learning unit 111 calculates the average value Tpk of the stored noise intervals, and compares the stored noise generation periods to calculate the maximum value Tnk. When the timing learning unit 111 completes the process of step S104, the process proceeds to step S105. In step S105, the timing learning unit 111 stores the calculated average value Tpk and the determined maximum value Tnk in a storage unit (not shown). When completing the process of step S105, the timing learning unit 111 proceeds to the process of step S106. In step S106, the timing learning unit 111 determines whether or not the ignition key is on. When the timing learning unit 111 determines in step S106 that the ignition key is on, the process returns to step S101. On the other hand, when the timing learning unit 111 determines in step S106 that the ignition key is not turned on, the timing learning unit 111 ends the process illustrated in the flowchart of FIG. In step S107, the timing learning unit 111 increments the count number k by 1. When completing the process of step S107, the timing learning unit 111 returns to the process of step S102. In the process shown in the flowchart of FIG. 3 of the present embodiment, after the process shown in step S105, the process shown in step S101 may be always returned without performing the process shown in step S106. Thereby, the timing learning unit 111 can always perform the learning process even after the holder of the portable device 12 gets off with the ignition key turned off. By always performing the learning process, even when the owner of the portable device 12 approaches to get on again, two-way communication can be performed in a period in which noise is not generated using the learning result immediately.

  The learning process of the timing learning unit 111 has been described in detail above. Next, by using the average value Tpk and the maximum value Tnk learned by the timing learning unit 111, the portable device 12 is caused to transmit the portable-side transmission signal Ps while avoiding the noise generation period, and the vehicle-side communication device 11 The operation of performing bidirectional communication with will be described in detail.

  FIG. 4 is a timing chart in which the vehicle side communication device 11 and the portable device 12 perform bidirectional communication while avoiding periodic noise using the average value Tpk and the maximum value Tnk learned by the timing learning unit 111. FIG. First, the code and the learning timing shown in FIG. 4 will be described.

  In FIG. 4, N1 to N3 indicate learning timings learned by the timing learning unit 111, respectively. C1 and C2 indicate transmission timings of vehicle-side transmission signals Cs including codes (hereinafter referred to as vehicle-side transmission signals Cs (C1) and vehicle-side transmission signals Cs (C2), respectively). P1 and P2 indicate transmission timings of the mobile-side transmission signal Ps including a code (hereinafter referred to as mobile-side transmission signal Ps (P1) and mobile-side transmission signal Ps (P2), respectively).

  Since the timing learning unit 111 determines the average value Tpk of the noise interval of the periodic noise generated from the surroundings and the maximum value Tnk of the respective noise generation periods as described above, all the noises generated from the surroundings are It occurs within the period shown in the learning timing of FIG. That is, the mobile side transmission signal Ps and the surrounding noise interfere by transmitting the mobile side transmission signal Ps to the mobile device 12 so as to avoid the learning timing shown in FIG. Can be prevented.

  In FIG. 4, Tpk and Tnk are the average value Tpk and the maximum value Tnk learned by the timing learning unit 111 as described above. Tcs1 and Tcs2 are respectively the start timings of N1 to N3, that is, from the time of detection of the rising edge of each noise to the start timing of transmission of the vehicle side transmission signal Cs (C1) and the vehicle side transmission signal Cs (C2). Indicates the period. Tcpa indicates the period from the start to the completion of transmission of the vehicle-side transmission signal Cs (C1) and the vehicle-side transmission signal Cs (C2), and the type of code included in the vehicle-side transmission signal Cs It is a certain period determined in advance. Tps1 and Tps2 indicate periods from the start timing of N1 to N3 to the start of transmission of the portable side transmission signal Ps (P1) and the portable side transmission signal Ps (P2), respectively. Tp1 and Tp2 indicate periods from the start to the completion of transmission of the portable side transmission signal Ps (P1) and the portable side transmission signal Ps (P2), respectively. Tcpb indicates a period from when the portable device 12 receives the vehicle-side transmission signal Cs to when the portable device 12 starts transmitting the portable-side transmission signal Ps according to the received vehicle-side transmission signal Cs. It is a certain period. FIG. 4 shows a state in which the timing learning unit 111 transmits and receives each code based on Tnk and Tpk with reference to the time when the rising edge of noise is detected.

  Next, the order in which the codes shown in FIG. 4 are transmitted and received will be described. In FIG. 4, first, the vehicle side transmission signal Cs (C1) is wirelessly transmitted from the transmission unit 114. The portable device 12 that has received the vehicle-side transmission signal Cs (C1) transmitted wirelessly generates a portable-side transmission signal Ps (P1) that includes a code P1 corresponding to the code C1 included in the vehicle-side transmission signal Cs. Wirelessly transmit. Then, the reception unit 113 receives and demodulates the portable transmission signal Ps (P1) wirelessly transmitted from the portable device 12.

  At this time, according to the code P1 included in the demodulated signal Ds demodulated by the receiving unit 113, the type of code that the timing learning unit 111 determines to transmit next is the code C2. Therefore, when the receiving unit 113 receives the portable side transmission signal Ps (P1), the vehicle side transmission signal Cs (C2) is transmitted from the transmission unit 114 in accordance with the portable side transmission signal Ps (P1). Then, the portable device 12 receives the vehicle-side transmission signal Cs (C2) wirelessly transmitted from the transmission unit 114. The portable device 12 that has received the vehicle-side transmission signal Cs (C2) wirelessly transmits the portable-side transmission signal Ps (P2) including the code P2 corresponding to the code C2 included in the vehicle-side transmission signal Cs. And the receiving part 113 receives and demodulates the portable side transmission signal Ps (P2) transmitted by radio from the portable device 12. The order in which the codes shown in FIG. 4 are transmitted and received has been described above.

  Note that the timing chart shown in FIG. 4 is a two-step bi-directional operation in which the vehicle-side communication device 11 and the portable device 12 transmit and receive the code P1 according to the code C1 and the code P2 according to the code C2, as described above. A state of communication is shown. However, in the present embodiment, the bidirectional communication between the vehicle-side communication device 11 and the portable device 12 is not limited to two steps, and may be performed by one or more steps corresponding to the amount of information necessary for bidirectional communication. Needless to say, it is good.

  Next, the timing learning unit 111 transmits the portable-side transmission signal Ps to the portable device 12 based on the learned average value Tpk and maximum value Tnk so as not to overlap with the respective timings N1 to N3 shown in FIG. About the operation | movement to perform, transmission / reception of vehicle side transmission signal Cs (C1) and portable side transmission signal Ps (P1) is demonstrated as an example.

  In FIG. 4, in order for the portable side transmission signal Ps (P1) to be received by the receiving unit 113 without being superimposed on noise, the transmission period of the portable side transmission signal Ps (P1) is N1 and N2 as described above. Must not overlap with the period. For this purpose, as is apparent from FIG. 4, two conditions of Tps1> Tnk and Tps1 + Tp1 <Tpk must be satisfied. Of these two conditions, the condition of Tps1> Tnk is that the interval from the start timing of the next predicted noise to the transmission start timing of the mobile transmission signal is longer than the longest occurrence time of one noise. That is. Of the two conditions, the condition of Tps1 + Tp1 <Tpk is that the interval from the start timing of any one of the noises to the transmission completion timing of the mobile-side transmission signal occurs next from the start timing of any one of the noises Then, the interval until the predicted noise start timing is shorter.

  As apparent from FIG. 4, Tps1 is a period obtained by adding Tcs1, Tcpa, and Tcpb. As described above, Tcpa and Tcpb are predetermined periods. Therefore, the timing learning unit 111 determines the remaining Tcs1, that is, the transmission start timing of the vehicle-side transmission signal Cs (C1) so that Tps1> Tnk and Tps1 + Tp1 <Tpk. Then, the timing learning unit 111 generates the timing notification signal Tm when the timing Tcs1 determined from the rise of the learning timing N1 arrives. That is, the timing notification signal Tm is a signal that notifies the signal generation unit 112 of a period in which no noise is generated. Thereby, since the transmission timing of the portable transmission signal Ps (P1) does not overlap with the learning timings N1 and N2, the code P1 included in the demodulated signal Ds is normal without overlapping with noise as shown in FIG. Demodulated. Similarly, for transmission / reception of the vehicle-side transmission signal Cs (C2) and the portable-side transmission signal Ps (P2), the timing learning unit 111 similarly performs the remaining Tcs2, that is, Tps2> Tnk and Tps2 + Tp2 <Tpk, that is, The transmission start timing of the vehicle side transmission signal Cs (C2) is determined.

  In FIG. 4, the transmission periods of the vehicle-side transmission signal Cs (C1) and the vehicle-side transmission signal Cs (C2) overlap (synchronize) with the periods of the learning noises N1 and N2, respectively. However, as described above, since the frequency of the vehicle-side transmission signal Cs and the frequency of the periodic noise generated from the surroundings are different from each other, even if the transmission periods overlap each other, they are generated from the vehicle-side transmission signal Cs and the surroundings. There is no interference with periodic noise.

  As described above, based on the average value Tpk and the maximum value Tnk learned by the timing learning unit 111, the operation of causing the portable device 12 to transmit the portable-side transmission signal Ps so as not to overlap with the respective timings N1 to N3 shown in FIG. Explained. It should be noted that the fact that the timing learning unit 111 learns the average value Tpk and the maximum value Tnk also means that the timing of noise generated from the surroundings is predicted. Next, a flowchart specifically showing the procedure of this operation will be described.

  FIG. 5 is a flowchart specifically illustrating a process in which the timing learning unit 111 determines the transmission timing of the vehicle-side transmission signal Cs based on the learning result. In the flowchart of FIG. 5, Tcs indicates the transmission start timing of the vehicle-side transmission signal Cs (corresponding to Tcs1 or Tcs2 shown in FIG. 4). Further, Tps indicates the transmission timing (corresponding to Tps1 or Tps2 shown in FIG. 4) of the portable side transmission signal Ps transmitted according to the vehicle side transmission signal Cs, and Tp corresponds to the vehicle side transmission signal Cs. The transmission period of the vehicle-side transmission signal Cs to be transmitted (corresponding to Tp1 or Tp2 described above) is shown.

  In step S201, the timing learning unit 111 determines whether an instruction to transmit the vehicle-side transmission signal Cs has been received from a control unit (not shown) or whether the portable-side transmission signal Ps including the code has been received. When the timing learning unit 111 determines in step S201 that an instruction to transmit the vehicle-side transmission signal Cs has been received or that the mobile-side transmission signal Ps including the code has been received, the process proceeds to step S202. On the other hand, when the timing learning unit 111 determines in step S201 that it has not received an instruction to transmit the vehicle-side transmission signal Cs or has not received the mobile-side transmission signal Ps including the code, the process of step S201 is performed. Return to.

  In step S202, the timing learning unit 111 reads an average value Tpk and a maximum value Tnk learned from a storage unit (not shown). When the timing learning unit 111 completes the process of step S202, the process proceeds to step S203. In step S203, the timing learning unit 111 determines the transmission period Tp of the vehicle-side transmission signal Cs by determining the type of code to be transmitted next. When the timing learning unit 111 completes the process of step S203, the process proceeds to step S204. In step S204, the timing learning unit 111 determines Tcs so that Tps> Tnk and Tps + Tp <Tpk as described above. When the timing learning unit 111 completes the process of step S204, the process proceeds to step S205.

  In step S205, the timing learning unit 111 determines whether or not the rising edge of the noise has been detected based on the noise included in the demodulated signal Ds. When the timing learning unit 111 determines in step S205 that the learning timing rises, the process proceeds to step S206. On the other hand, when the timing learning unit 111 determines in step S205 that the learning timing has not risen, the timing learning unit 111 repeats the process of step S205. In step S206, the timing learning unit 111 generates a timing notification signal Tm when Tcs elapses after the rise of the learning timing has arrived. When the timing learning unit 111 completes the process of step S206, the process proceeds to step S207.

  In step S207, the timing learning unit 111 determines whether or not the ignition key is on. When the timing learning unit 111 determines in step S207 that the ignition key is on, the process returns to step S201. On the other hand, when the timing learning unit 111 determines in step S207 that the ignition key is not turned on, the timing learning unit 111 ends the process illustrated in the flowchart of FIG. In the process shown in the flowchart of FIG. 5 of the present embodiment, after the process shown in step S206, the process may always be returned to step S201 without proceeding to step S207. This is because the portable device 12 and the vehicle-side communication device 11 need to bidirectionally communicate with each other when the owner of the portable device 12 gets off the vehicle after turning off the ignition key and then gets on again.

  When the transmission period Tp of the portable transmission signal Ps is longer than Tpk, the bit rate for transmission / reception of the vehicle transmission signal Cs and the portable transmission signal Ps is changed to shorten the period necessary for transmission / reception. May be. This can be achieved by adding a configuration for varying the bit rate to the vehicle-side communication device 11 and the portable device 12 and including information indicating the changed bit rate in the vehicle-side transmission signal Cs.

  As described above, according to the present invention, even when periodic noise occurs, it is possible to cause the portable device 12 to transmit the portable-side transmission signal Ps while avoiding the periodic noise. Since the frequency of the signal Ps is equal to each other, it is possible to prevent the code included in the mobile-side transmission signal Cs from being demodulated normally due to the influence of noise.

  In the first embodiment, the receiving unit 113, the transmitting unit 114, and the ECU 115 are different from each other. However, the present invention employs a configuration in which the reception unit 113 and the transmission unit 114 are integrated, a configuration in which the transmission unit 114 and the ECU 115 are integrated, and a configuration in which a configuration other than the portable device 12 illustrated in FIG. 1 is integrated. Needless to say, it may be.

  In the first embodiment, the period from when the portable device 12 receives the vehicle-side transmission signal Cs to when the portable device 12 transmits the portable-side transmission signal Ps is determined in advance. And the vehicle side transmission signal Cs shall be transmitted when the timing which the timing learning part 111 learned arrives so that the portable side transmission signal Ps may be transmitted from the portable device 12 at the timing which noise does not generate | occur | produce. However, based on the timing learned by the timing learning unit 111, the portable device 12 may determine a period during which noise is not generated and transmit the portable transmission signal Ps.

  More specifically, the following modifications can be considered as modifications of the first embodiment. In the modified example, the timing learning unit 111 generates a learned timing at which no noise is generated as timing information, and the signal generation unit 112 generates a modulation signal Ms including the timing information and a code. Then, the transmission unit 114 converts the modulation signal Ms including the timing information and the code into a wireless signal, and wirelessly transmits the wireless signal as the vehicle-side transmission signal Cs. The portable device 12 determines a period in which noise is not generated based on the timing information included in the vehicle-side transmission signal Cs, and transmits the portable-side transmission signal Ps in the determined period.

  As described above, according to the modification of the first embodiment, it is possible to reliably prevent the two-way communication between the vehicle-side communication device and the portable device from being disturbed as in the first embodiment. In the modification of the first embodiment, there is a method described below as a method in which the portable device 12 determines a period in which noise is not generated based on the received timing information. In the first method, based on the timing learned by the timing learning unit 111, timing information that informs a period from when the portable device 12 receives the vehicle-side transmission signal Cs to when transmission of the portable-side transmission signal Ps is started. It is a method of generating. In the first method, after the portable device 12 receives the vehicle-side transmission signal Cs, the timing for starting transmission of the portable-side transmission signal Ps arrives based on the timing information included in the vehicle-side transmission signal Cs. When this occurs, it is determined that a period in which noise does not occur has arrived. The second method is a method in which the portable device 12 includes a reference internal clock. In the second method, the timing learning unit 111 generates timing information that informs the generation timing of noise by time. The portable device 12 receives the vehicle-side transmission signal Cs including timing information indicating the time at which noise is generated, and a period in which noise is not generated when the time indicated by the timing information matches the time indicated by the internal clock. Is determined to have arrived.

  ADVANTAGE OF THE INVENTION According to this invention, a portable side transmission signal can be transmitted to a portable device avoiding the generation | occurrence | production timing of a periodic noise, for example, the vehicle equipment remote control system mounted in moving bodies, such as a motor vehicle, and vehicle equipment It can be used for remote control devices.

The block diagram which shows the structure of the vehicle equipment remote control system 10 which concerns on 1st Embodiment. Diagram showing demodulated signal with periodic noise superimposed on code Flow chart showing the learning process of the timing learning unit Timing chart showing bidirectional communication of the in-vehicle device remote control system 10 according to the first embodiment The flowchart which shows the process which determines the timing which a timing learning part produces | generates a timing notification signal Block diagram showing the configuration of a conventional vehicle door remote control device

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 In-vehicle apparatus remote control system 11 Vehicle side communication apparatus 12 Portable machine 111 Timing learning part 112 Signal generation part 113 Reception part 114 Transmission part

Claims (7)

A vehicle-mounted device remote control system comprising a portable device and a vehicle-side communication device capable of communicating with the portable device,
The vehicle-side communication device is
Receiving means for receiving a signal including periodically generated noise;
Instructing means for instructing the portable device to transmit a portable transmission signal during a period in which no noise is generated based on a prediction result of a noise generation period based on a reception result of noise by the receiving means. ,
The in-vehicle device remote control system, wherein the portable device transmits the portable-side signal in response to an instruction from the instruction means. The vehicle-side communication device is
A timing determination unit that determines an instruction timing of the instruction unit based on the prediction result so that the portable device transmits the portable-side transmission signal in a period in which the noise does not occur;
When the instruction timing has arrived, the instruction means transmits a vehicle-side transmission signal that instructs the portable device to transmit the portable-side transmission signal,
The in-vehicle device remote control system according to claim 1, wherein the portable device transmits the portable-side transmission signal in response to receiving the vehicle-side transmission signal. The vehicle-side communication device is
Timing information generating means for generating timing information indicating a period in which the noise does not occur based on the prediction result;
The instructing means transmits a vehicle-side transmission signal including the timing information,
The in-vehicle device remote control system according to claim 1, wherein the portable device transmits the portable-side transmission signal during a period indicated by the timing information included in the vehicle-side transmission signal. The timing determining means includes
First calculating means for calculating a timing at which noise is predicted to occur based on the received noise generation start timing when the receiving means has received the noise a predetermined number of times;
Second calculation means for calculating the longest occurrence time of the received noises when the noise is received a predetermined number of times by the reception means;
The prediction means for predicting the noise occurrence period based on the timing calculated by the first calculation means and the longest occurrence time calculated by the second calculation means. The in-vehicle device remote control system according to 2.   The timing determination unit is configured to detect a noise that is predicted to occur next, with an interval from a start timing of noise predicted to be generated next to a transmission start timing of the mobile-side transmission signal being longer than the longest generation time. The interval from the start timing of the mobile side transmission signal to the transmission completion timing of the mobile-side transmission signal is shorter than the interval from the start timing of the noise predicted to occur next to the start timing of the noise predicted to occur next The in-vehicle device remote control system according to claim 4, wherein the transmission start timing is defined.   The in-vehicle device remote control system according to claim 5, wherein the timing determination unit determines the transmission start timing so that the vehicle-side transmission signal is transmitted within the predicted noise generation period. An in-vehicle device remote control device that can communicate with a portable device,
Receiving means for receiving a signal including periodically generated noise;
Instructing means for instructing the portable device to transmit a portable transmission signal during a period in which no noise is generated based on a prediction result of a noise generation period based on a reception result of noise by the receiving means. In-vehicle equipment remote control device.

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