JP2007216869A - On-vehicle equipment remote control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicle equipment remote control device which achieves compatibility of radio noise countermeasure and a good power source power utilization factor at low cost. <P>SOLUTION: The on-vehicle equipment remote control device has an operation control means for transmitting/receiving a signal between an on-vehicle transmission antenna and a portable machine and controlling the operation state of the on-vehicle equipment when code checking of a return signal returned from the portable machine is performed. The device is also provided with: an antenna drive control means provided with a wave form switching control means 604 for selecting and leading any one of a sine wave signal generated by a sine wave generation means 603 and a rectangular wave signal Vp generated by a rectangular wave generation means; and a transmission circuit part 17a inputted with the sine wave signal or the rectangular wave signal selected by the wave form switching control means and outputting a transmission antenna drive output Vo of a wave form corresponding to the inputted wave form as a drive means for driving the transmission antennas 11a-12d. The transmission antenna is driven by switching to sine wave driving or rectangular wave driving according to the use circumstance. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an in-vehicle device remote control device, and relates to an in-vehicle device that performs code verification by communication with a portable device (hereinafter also referred to as a portable wireless device) and controls whether to permit or disallow use of a vehicle based on the verification result. The present invention relates to a remote control device.

Conventionally, in addition to the remote operation function of operating / operating the operation unit of the portable wireless device to lock / unlock the door of the vehicle, the transmission request signal from the vehicle side can be transmitted without operating the operation unit of the portable wireless device. On the other hand, there is a smart entry system in which a return code signal is returned from a portable wireless device and the door is locked / unlocked by checking the code. As an example of this smart entry system, for example, Japanese Patent Application Laid-Open No. 5-106376 discloses a portable radio apparatus including a first transmission unit that transmits a response signal when a call signal is received by a first reception unit. When the second receiving means receives the call signal transmitted from the second transmitting means at a predetermined time interval and receives the transmitted response signal, it outputs a signal for unlocking the vehicle door. If a response signal is not received, a system including a vehicle radio apparatus including a control unit that outputs a signal for locking the door of the vehicle after a predetermined time has elapsed is described.
Further, conventionally, a return code signal is returned in response to a transmission request signal from the vehicle side, and the code is collated to unlock the steering lock mechanism and release the engine start prohibition device, and no mechanical key is used. There is a smart start system that enables engine start operation. As an example of this smart start system, for example, in Japanese Patent Application Laid-Open No. 63-1765, a call signal is transmitted to a portable wireless device, a code code signal is received from the portable wireless device, and the code is collated and matched. Sometimes a system is described which comprises means for allowing each of the unlocking operation of the steering lock mechanism, the switching operation of the engine switch and the switching operation of the accessory switch.

  As an example of a loop antenna rectangular wave drive circuit, Japanese Patent Application Laid-Open No. 10-154951 discloses an antenna drive circuit with an output (trapezoidal wave) of a waveform shaping circuit that shapes a sine wave of a sine wave transmission circuit into a trapezoidal wave. A transmission device is described which is driven to prevent a decrease in transmission efficiency.

JP-A-5-106376 JP-A 63-1765 JP-A-10-15951

The name of the system combining both the above systems will be referred to as a smart entry / start system.
In the smart entry / start system, low frequency (LF) band wireless communication is used from the vehicle to the portable wireless device, and the antenna drive is a sine wave with an LC resonance circuit including a rectangular wave drive and an antenna with low switching loss. Although it is output, since the antenna drive is a rectangular wave drive, its harmonics may reach the AM radio frequency band and become radio noise.
The noise path is when the radio wave from the transmission antenna enters the radio reception antenna, or when the radio wave leaking from the drive circuit (in the ECU) and the transmission antenna wiring passes through the radio reception antenna or other wiring. Radio noise enters the radio from the input section.
For this reason, it is necessary to take measures to limit the arrangement, such as making the wiring to the transmission antenna a shield line, or increasing the distance between the LF transmission antenna and the radio reception antenna.

As a measure against radio noise, it can be solved by changing the driving of the transmitting antenna to a sine wave drive, but the sine wave drive is a sine wave generating means, a control means for a low distortion sine wave amplification, etc. In addition, the cost associated with the generation of the additional cost and the loss of the final stage drive element is increased, and in addition, the power utilization rate is deteriorated by about 30% compared to the rectangular wave drive. There is also an increase in cost due to a decrease in
In addition, when the power utilization rate is poor, in a system that always transmits outside the vehicle in a waiting state of boarding in the so-called area detection method as disclosed in Japanese Patent Laid-Open No. 5-156651, the dark current of the vehicle battery increases, and the viewpoint of preventing the battery from rising. Is not preferable.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide an in-vehicle device remote control device that can achieve both radio noise countermeasures and power supply utilization rate at low cost.

  In the in-vehicle device remote control device according to the present invention, a code request signal is transmitted from a transmitting antenna to a portable device, and a return code of a return signal returned from the portable device that has received the code request signal is collated. In the in-vehicle device remote control device having the operation control means for controlling the operation state of the in-vehicle device, the sine wave generating means for generating the sine wave and the rectangular wave generating means for generating the rectangular wave as the driving means for driving the transmitting antenna A waveform switching control means for selecting and deriving either a sine wave signal generated by the sine wave generating means or a rectangular wave signal generated by the rectangular wave generating means, and a sine selected by the waveform switching control means Antenna drive control means including a transmission circuit unit that receives a wave signal or a rectangular wave signal and outputs a transmission antenna drive output having a waveform corresponding to the input waveform The antenna driving control means is to the transmission antenna based on usage, and to be driven by switching to the sinusoidal wave driving or rectangular wave driving.

  According to the in-vehicle device remote control device of the present invention, since it is a drive circuit capable of switching the transmission antenna drive waveform by the antenna drive control means for switching the waveform between the sine wave and the rectangular wave, depending on the situation used, A suitable drive waveform can be selected, and a system that can achieve both radio noise countermeasures and power supply utilization can be realized at low cost.

Embodiment 1 FIG.
A vehicle-mounted device remote control device according to Embodiment 1 of the present invention will be described with reference to FIGS.
FIG. 1 is a block diagram showing an example of a configuration on the in-vehicle device side in the in-vehicle device remote control device according to the first embodiment.
In FIG. 1, the in-vehicle device includes a first in-vehicle transmitting antenna 11a and a second in-vehicle transmitting antenna 11b as in-vehicle antennas, and six first to fourth in-vehicle transmitting antennas 12a to 12d as in-vehicle antennas. Has two transmit antennas.
As shown in FIG. 3 to be described later, the vehicle interior antenna 11a is installed near the center console in the vehicle interior, and the vehicle interior antenna 11b is installed near the rear seat.
On the other hand, the outside antennas 12a to 12d are provided, for example, on door handles of a vehicle (four-wheeled vehicle).
Each of the transmission antennas 11 a to 12 d is connected to a transmission unit 17, and the transmission unit 17 is connected to an electronic control device (hereinafter referred to as ECU) 20.

The ECU 20 supplies a transmission code and a signal designating one of the transmission antennas 11a to 12d to the transmission unit 17, and a designated transmission signal as a code request signal having a frequency at which the transmission code is modulated, for example, 134 kHz. It transmits to the portable radio | wireless machine 50 mentioned later from an antenna.
Further, the vehicle is provided with a receiving antenna 18, and a frequency, for example, 315 MHz signal from the portable radio 50 received by the receiving antenna 18 is demodulated by the receiving unit 19 and supplied to the ECU 20.

The ECU 20 has a built-in memory 24 in which an ID code for a call signal, a question signal, and an immobilizer, which will be described later, and an encryption key for decrypting the immobilizer and the answer code are stored. The memory 24 is a nonvolatile memory such as an EEPROM, and the stored contents are retained even when the power is turned off.
The operation detection unit 21 detects various switch operations by the user, and for example, presses an activation switch (signal source for starting transmission of a code request signal) or an engine switch installed on each outer door handle. The position of the key knob switch for starting the communication for unlocking and the engine switch (starting, ignition on, accessory on, off, lock, etc.) is detected, and the operation detection signal is supplied to the ECU 20.
The door open / close detection unit 22 detects individual open / close states of all doors and individual lock / unlock states of all doors, and supplies detection signals to the ECU 20.
The sensor group 23 is a touch sensor built in each outer door handle, or various sensors that detect a vehicle speed, a shift position, and an engine operating state. Detection signals of these various sensors are supplied to the ECU 20.

Further, the ECU 20 is connected with a steering lock unit 32, an immobilizer unit 34, a door lock unit 36, a shift lock unit 38, and a notification unit 25.
The steering lock part 32 releases the rotation lock mechanism from the lock position of the engine switch and also releases the mechanical lock mechanism for steering operation. When the engine switch is returned to the lock position, both lock mechanisms are locked.
The immobilizer unit 34 is a mechanism that prohibits fuel supply to the engine 40 and ignition operation. The door lock unit 36 is a mechanism for locking / unlocking all doors.
The shift lock unit 38 is a lock device that prohibits the shift from the parking range to another range by the transmission gear shift mechanism, and outputs an unlock / permitted signal from the ECU 20.
The notification unit 25 is an answer-back device that turns on a vehicle light or horns as a so-called answer-back when the door is locked / unlocked, an alarm device that generates a buzzer for various alarms, or a status display Includes display device.
In addition, an engine control unit 30 is connected to the ECU 20, and the engine control unit 30 can control start of the engine 40 using a cell motor and can also control driving stop of the engine 40.

FIG. 2 is a block diagram illustrating an example of a configuration on the portable wireless device side in the in-vehicle device remote control device according to the first embodiment.
In FIG. 2, the ECU 52 has a built-in memory 53. The memory 53 stores the same ID code and encryption key as those stored in the memory 24 of the in-vehicle device if it is authorized. .
The portable wireless device 50 has a transmission antenna 56 and a reception antenna 58.
These antennas 56 and 58 are connected to the transmission unit 55 and the reception unit 57, respectively, and the transmission unit 55 and the reception unit 57 are connected to the ECU 52.
A question signal of a frequency, for example, 134 kHz, received from the in-vehicle device and received by the receiving antenna 58 is demodulated by the receiving unit 57 and supplied to the ECU 52.
The ECU 52 reads out an encryption key corresponding to the question signal from the memory 53, encrypts the question code in the question signal, creates a response signal, supplies the response signal to the transmission unit 55, and modulates the frequency by the transmission unit 55, for example, The signal is transmitted from the transmission antenna 56 to the in-vehicle device as a 315 MHz signal.
In addition, there is a LOCK key / UNLOCK key or the like for remote operation of door locking / unlocking as a keyless entry function, and these signals are input from the operation detection unit 51 to the ECU 52.

FIG. 5 shows a connection state between the internal block of the receiving unit 57 of FIG. 2 and the ECU 52 and the receiving antenna 58.
The receiving unit 57 receives a wake signal from the ECU 52 when a predetermined frequency component exceeds a demodulatable level in a preamble portion of signals shown in FIGS. 4A and 4C described later received by the receiving antenna 58. A start detection unit 57a that outputs a signal, a reception magnetic field strength detection unit 57c that holds the reception level in the preamble portion and outputs it as an RSSI (Received Signal Strength Indicator) signal (reception strength signal) to the ECU 52, and a code portion after the preamble portion And a control unit 57d that resets the activation detection unit 57a and the received magnetic field strength detection unit 57c in preparation for the next new reception when the reset signal is input. ing.

FIG. 6 is an electric circuit diagram showing the power source 10B, the transmission unit 17 and transmission antennas (11a to 12d) of FIG. 1, and the part related to transmission of the ECU 20 (= the part other than the above in FIG. 6). . 6 that are the same as those in FIG. 1 are denoted by the same reference numerals.
In FIG. 6, a power source 10B is a vehicle power source, for example, rated DC 12V.
The voltage Vb of the power supply 10B is stabilized at, for example, 5V by the constant voltage power supply 602 and supplied to the computer 601. The power supply 10B is supplied to the transmission unit 17 for driving the transmission antenna.
The voltage of the power supply 10B divided by the resistors R21 and R22 is input to the input terminal AD1 of the computer 601, and is AD-converted and recognized by the computer.
A rectangular wave pulse train Vp equal to the transmission frequency is transmitted from the output terminal PWM of the computer 601 at a predetermined duty = d with a constant amplitude (for example, 5 V).
A switcher (waveform switching control means) 604 inputs a rectangular wave Vp and the rectangular wave pulse train Vp to the input signal Vs of the amplifying unit (transmitting circuit unit) 17a of the transmitting unit, and is referred to as a low-pass filter (hereinafter referred to as LPF). ) Control for switching the sine wave obtained through 603 is performed at the output terminal P1 of the computer 601.
A predetermined analog voltage output Vos is output from the output terminal DA of the computer 601 and supplied to the amplifying unit 17a.

Here, the relationship between the input signals Vs and Vos of the amplifying unit 17a and the output Vo can be expressed by the following equations (1) to (5) with the power supply voltage as Vb.
First, when a sine wave is selected as the input signal Vs, since the signals other than the fundamental wave are sufficiently attenuated by the LPF, the input signal Vs is expressed by the following equation (1).

  The output V1 of IC2 of the amplifying unit 17a is expressed by the following formula (2) where R7 = R6.

  The output voltage Vo of the amplifying unit 17a is expressed by the following formula (3) as R3 = R4 and the power supply voltage Vb.

Here, when the input signal Vos is set so that the following formula (4) is established, the above formula (3) becomes the following formula (5).

That is, the output Vo of the amplifying unit 17a is as shown in Expression (5), and by changing the duty d, a sine wave having a required amplitude centered on 1/2 of the power supply voltage is generated.
Note that when a rectangular wave is selected as the input signal Vs, a rectangular wave output can be realized in the same manner only by changing the first term on the right side of the equation (1) to a rectangular wave.

Next, the power supply utilization rates of the sine wave and the rectangular wave when the antenna is driven will be compared.
For simplicity, when the voltage drop due to the on-resistance of the transistor and the protection resistors R10 and R11 (for example, 0.5Ω or less) is ignored, the maximum _AT of the fundamental voltage amplitude is expressed by the following equation (6) in the rectangular wave drive.
Next, the maximum A _S in the case of a sine wave becomes the following equation (7).

  That is, in the case of a sine wave, the power supply voltage utilization factor is as bad as π / 4 (78.5%) with respect to a rectangular wave.

  As for the output of the amplifying unit 17a in FIG. 6, any one of the output terminals P2-P7 of the computer 601 outputs an ON signal, thereby switching the antenna circuit switch 17b to drive a desired antenna.

Further, the output Vo of the amplifying unit 17a is divided by resistors R23 and R24 and input to the AD input terminal AD2 of the computer 601, and the antenna current is caused by a failure such as disconnection in the antenna driving circuit such as the transmitting unit or the antenna unit. When 0 is reached, the output voltage Vo is monitored in order to detect a failure.
The output voltage Vo when the transistor Tr2 is on and the Tr1 is off in the case of the rectangular wave drive is approximately 0 when the antenna current is 0 due to a failure, whereas when the antenna current is normal, the output voltage Vo is Since the generated non-zero voltage can be monitored, a failure of the antenna drive circuit can be easily detected. In the case of sine wave drive, since the output voltage Vo is feedback-controlled to a sine wave voltage, it is difficult to easily discriminate as in the case of detecting a failure in rectangular wave drive. The failure detection is scheduled to be executed, for example, when the getting-off state is detected.

FIG. 3 schematically shows communication between each of the transmission antennas 11a to 12d and the portable wireless device 50.
A method for confirming whether the portable wireless device 50 is a legitimate registered device (partner authentication method) is described as a so-called challenge-response method (secret key encryption-based partner authentication method) as an example. In FIG. 3, a code request signal having a frequency of 134 kHz is transmitted from each of the transmission antennas 11a to 12d on the vehicle-mounted device side, and the portable wireless device 50 receives the code request signal = question signal and responds to the received question signal. A response signal having a frequency of 315 MHz modulated with a response code (cipher text) created from the encryption key and the question code (plain text) is returned.
A signal having a frequency of 315 MHz received by the receiving antenna 18 on the in-vehicle device side is demodulated by the receiving unit 19 and supplied to the ECU 20, and the ECU 20 receives the response signal.
The in-vehicle device collates the ciphertext created with the cipher key corresponding to the transmitted inquiry code (plain text) and the received response code, and confirms whether the portable radio device 50 is a regular registration device.
FIG. 3A is an explanatory diagram when the portable wireless device 50 is outside the vehicle, and FIG. 3B is an explanatory diagram when the portable wireless device 50 is inside the vehicle.
A low frequency (hereinafter abbreviated as LF) is used from the in-vehicle transmission antennas 11a to 12d to the portable wireless device 50. The reason is that the electromagnetic wave uses a magnetic field component whose intensity is inversely proportional to the cube of the distance so that the position of the portable wireless device 50 can be easily confirmed, and the normal communication distance is about 1 m. On the other hand, the UHF band is used for communication from the portable wireless device 50 to the in-vehicle receiving antenna 18, and the communication distance is usually 5 to 20 m.

FIGS. 7 and 8 are flowcharts for explaining the operation of the portion related to communication with the portable wireless device executed by the ECU 20 of the in-vehicle device in the first embodiment, and FIG. 9 is a flowchart for explaining the operation executed by the ECU 52 of the portable wireless device. Show.
In FIG. 7, this flowchart 200 shows a certain state in the waiting-for-ride mode when the start switch, the key knob SW, and each ignition switch position of the engine switch (hereinafter referred to as IG ON) are turned on after the ECU is started. It is a program that is executed at intervals (for example, every 0.5 seconds).
In step 201, it is confirmed which of the execution conditions is satisfied.

If the activation SW is on (step 202), a call signal is received from the outside antenna corresponding to the activation switch that is turned on in step 203 (for example, the outside antenna 12a if the right front door outer handle activation SW is on). Sent.
In step 204, a response signal response to the call signal is confirmed.
If there is no reply, the process ends at step 299.
If there is a reply, a question signal is transmitted from the same outside antenna (step 205).
In step 206, the response of the answer signal to the question signal is confirmed.
If there is no reply or the reply answer is incorrect, the process ends at step 299.
If the reply is correct, it is checked in step 207 whether the door is unlocked.
If in the locked state, the door unlocking output is instructed in step 213 and the process ends in step 299. If it is unlocked, it is checked in step 208 whether the engine switch is in the locked position and all the doors are closed (condition 1).
If condition 1 is satisfied, a call signal is transmitted from all the antennas in step 209, and if it is confirmed in step 210 that the portable wireless device is not in the vehicle (no reply), a door locking output is output in step 211. Instruct and end at step 299.
If condition 1 is not satisfied in step 208, or if there is a reply in step 210, an alarm output is instructed in step 212 to notify that the lock operation cannot be performed, and the process ends in step 299.

If the key knob SW is on (step 220), in step 221, a call signal is transmitted from all the in-vehicle antennas.
In step 222, a response signal response to the call signal is confirmed.
If there is no reply, the process ends at step 299.
If there is a reply, a question signal is transmitted from the in-vehicle antenna (step 223).
In step 224, the response of the answer signal to the question signal is confirmed.
If there is no reply or the reply answer is incorrect, the process ends at step 299.
If the answer to the reply is correct, in step 225, the engine switch lock release output is instructed, and the process ends in step 299.

If IG is on (step 230), in step 231, a call signal is transmitted from all in-vehicle antennas.
In step 232, a response signal response to the call signal is confirmed.
If there is no reply, the process ends at step 299.
If there is a reply, a question signal is transmitted from the in-vehicle antenna (step 233).
In step 234, the response of the answer signal to the question signal is confirmed.
If there is no reply or the reply answer is incorrect, the process ends at step 299.
If the answer to the reply is correct, in step 235, the engine start permission is output and the process ends in step 299.

When the engine switch is in the locked position, there is no portable radio in the vehicle, and the door is in a so-called riding waiting mode in which the door is locked (step 250), in step 251, it is built in the outer door handle, The presence or absence of a signal from the touch sensor 23 that generates a signal when touching is confirmed.
If there is a signal, it is checked in step 252 whether or not there was a previous response signal. If there is a response signal, the door unlock output is instructed in step 256 and the process ends in step 299.
If the confirmation in steps 251 and 252 is NO, a call signal is transmitted from the outside antenna in step 253.
In step 254, a response signal response to the call signal is confirmed.
If there is no reply, the process ends at step 299.
If there is a reply, the presence / absence of a touch sensor signal is confirmed in step 255. If there is a reply, the process moves to step 256, and if not, the process ends in step 299.

Next, details of the transmission operations of steps 203, 205, 209, 221, 223, 231, 233, and 253 in FIG. 7 will be described with reference to FIG.
The program module 500 is a subroutine called in these steps.
In FIG. 8, in step 501, transmission command information (antenna number list to be transmitted, transmission mode, transmission destination, etc.) is obtained.
In step 502, it is confirmed whether or not there is an antenna to be transmitted. If there is no remaining antenna, the process ends in step 599.
If there is an antenna number to be transmitted in step 502, the antenna output is switched to this antenna number in step 503 (antenna circuit switcher 17b in FIG. 6 described above and output terminal P2-7 of computer 601).
In step 504, the transmission mode is confirmed.
If the transmission is for transmission driver circuit failure detection, a check signal is stored in the transmission code storage destination in step 507, and the process proceeds to step 514.
If it is a question signal in step 504, the question signal is stored in the transmission code storage destination in step 506, and the process proceeds to step 508.
If the call signal is a call signal in step 504, the call signal is stored in the transmission code storage destination in step 505, and the process proceeds to step 508.

In step 508, it is confirmed whether or not the vehicle is in the boarding waiting mode. If it is in the boarding waiting mode, the flow proceeds to step 514;
If it is an antenna outside the vehicle, the process proceeds to step 514. Otherwise, it is confirmed in step 510 whether IG is off.
If IG is off, the process proceeds to step 514. If not, it is confirmed in step 511 whether the ACC (accessory switch) is off.
If ACC is off, the process proceeds to step 514. Otherwise, it is confirmed in step 512 whether the power supply voltage is lowered (for example, 10 V or less).
If it is a voltage drop, go to step 514, otherwise, in step 513, set the drive waveform to a sine wave, set the duty of the PWM output to obtain the expected output at the output antenna, and in step 515 Transmission is started, and when transmission is completed, the process returns to step 502.

  In the above steps 508, 509, 510, 511, and 512, if the vehicle is in the waiting mode, the transmission antenna is the outside antenna, the IG is turned off, the ACC is turned off, or the power supply voltage is lowered, the drive waveform is set to a rectangular wave in step 514. Then, the PWM output duty for obtaining the planned output by the output antenna is set, transmission is started in step 515, and if transmission is completed, the process returns to step 502.

  When a remote control signal (door LOCK signal / UNLOCK signal) from a portable radio, which is a conventional keyless entry function, is received, the door is locked / unlocked regardless of the flow of FIG. The

Here, FIG. 4 shows a configuration example of the call signal, response signal, question signal, answer signal, and remote control signal.
FIG. 4A shows the structure of the paging signal, a preamble (for example, a burst signal of about 5 ms), a fixed ID code (for example, 20 bits) consisting of fixed length ID information, a bit indicating a paging signal, and a reception monitoring mode. It consists of an additional code (for example, 4 bits) including bit information for use and a parity bit. FIG. 6B shows the structure of the response signal, which is composed of an additional code including information such as a preamble, a fixed ID code, and a portable radio number, RSSI information, and a parity bit. FIG. 6C shows the structure of a question signal, which includes a preamble, a fixed ID code, a bit indicating that it is a question signal, an additional code including the number of a portable radio device to respond to, and a plaintext randomly generated each time (for example, 32 Bit) and a parity bit. FIG. 4D shows the structure of the answer signal, which includes a preamble, a fixed ID code, a bit indicating the answer signal, an additional code including information such as a portable radio number, and a ciphertext obtained by encrypting the received question code with an encryption key. It consists of a certain response code and parity bits. FIG. 5F shows the structure of the check signal, which is only the preamble.

As shown in FIG. 4 (e), the remote control signal in the case of performing keyless entry for controlling locking / unlocking of the vehicle door by pressing a button provided on the portable wireless device 50 is an answer code. Instead, set a rolling code.
The rolling code is a value that is counted up each time the portable wireless device transmits radio waves. The in-vehicle device stores the rolling code included in the predetermined code received from the portable wireless device last time, and receives this time. When the rolling code included in the predetermined code is within a predetermined range from the value of the previous rolling code, it is determined that the current rolling code is correct, and it is determined that the received predetermined code matches the specific code. This additional code includes identification information of the response signal and the remote control signal.

Based on the flowchart of FIG. 9, the operation of the portable wireless device 50 will be described.
When the ECU 52 starts from a reset state due to battery replacement or the like, the process starts from START (100). In step 101, the ECU 52 is initialized and the standby mode in step 102 is entered.
If there is a LOCK key input in step 103, WAKE UP (step 104), a LOCK signal which is a remote operation signal is transmitted in step 105, and the transmission returns to step 102 after the transmission is completed.
If there is no LOCK key input in step 103, the process goes to step 106.

If there is an UNLOCK key input in step 106, WAKE UP (step 107), a UNLOCK signal which is a remote operation signal is transmitted in step 108, and the process returns to step 102 after the transmission is completed.
If there is no UNLOCK key input in step 106, the process goes to step 109.

If there is reception from the in-vehicle device (LF reception) in step 109, WAKE UP (step 110) is performed, and it is confirmed in step 111 whether the received signal is a call signal.
If it is not a call signal, in step 113, an answer code is generated from the received question code and an answer signal is transmitted. After the transmission is completed, the process returns to step 102.
If the call signal is received in step 111, the answer signal is transmitted in step 112. After the transmission is completed, the process returns to step 102.

  As described above, according to the in-vehicle device remote control device according to Embodiment 1 of the present invention, the code request signal is transmitted from the transmission antenna to the portable device, and is returned from the portable device that has received the code request signal. A sine wave that generates a sine wave as a drive means for driving a transmitting antenna in an in-vehicle apparatus remote control device having an operation control means for controlling the operation state of the in-vehicle apparatus when code verification of the return code of the reply signal is performed Generating means, rectangular wave generating means for generating a rectangular wave, and waveform switching control means for selecting and deriving either a sine wave signal generated by the sine wave generating means or a rectangular wave signal generated by the rectangular wave generating means And a sine wave signal or a rectangular wave signal selected by the waveform switching control means is input, and a transmission antenna drive output having a waveform corresponding to the input waveform is output. Since the antenna drive control means includes a road portion, and the antenna drive control means is configured to drive the transmission antenna by switching to a sine wave drive or a rectangular wave drive according to the usage situation, the following It has an excellent effect.

(1) Since a suitable driving waveform can be selectively supplied to the transmitting antenna according to the situation in which it is used, a system capable of achieving both radio noise countermeasures and power supply power utilization can be realized.
In the case of only sine wave driving, in order to obtain an antenna driving current equivalent to rectangular wave driving even in the power supply fluctuation range, the driving unit needs to be made into a full bridge. However, according to the present invention, switching to rectangular wave driving is performed. Thus, a half-bridge configuration is sufficient, and as a result, a low-cost system can be constructed.
(2) When the power supply voltage of the vehicle is lowered, switching from sine wave driving to rectangular wave driving makes it possible to realize a system with a half-bridge configuration, thereby enabling a low-cost system.
(3) When the main power of the vehicle is off, or when the supplementary power source of the vehicle is off, switching to rectangular wave drive and radio noise does not become an obstacle, Since it can be high, it becomes a suitable system.
(4) Since the configuration of the sine wave generating means is a structure that performs low-pass filter processing on the output of the rectangular wave generating means, there are few components, and the offset voltage adjustment is common and simple, and can be realized at low cost. Is preferred.
(5) By detecting the failure of the antenna unit or the antenna drive transmission circuit unit by using the rectangular wave drive, there is an advantage that the failure determination can be performed more stably with respect to power supply fluctuations with a simple configuration.
(6) Area detection that periodically performs antenna transmission outside the vehicle by selecting the rectangular wave drive with high power utilization rate in the so-called boarding state when the main power of the vehicle is off and the door is locked This type of system has the advantage of reducing vehicle battery consumption.
(7) The transmission antenna to be used often operates before getting on or after getting off, which does not cause radio noise, and when it is an external antenna with a relatively large output, by using a rectangular wave drive with a high power utilization rate, It is preferable because a stable output can be obtained.

  The present invention can be applied to an in-vehicle device remote control device that performs code collation by communication with a portable device and performs control of permission or non-permission of use of a vehicle based on the collation result.

It is a block diagram which shows an example of the structure by the side of the vehicle equipment in the vehicle equipment remote control apparatus of Embodiment 1 of this invention. It is a block diagram which shows the structure by the side of the portable device in the vehicle equipment remote control apparatus of Embodiment 1 of this invention. It is a figure which shows typically communication with the vehicle-mounted antenna and portable machine in Embodiment 1 of this invention. It is a structural example of the signal of various communications in Embodiment 1 of this invention. It is an internal block diagram of the receiving part of the portable device in Embodiment 1 of this invention. It is electric circuits, such as a transmission part and a transmission antenna part in Embodiment 1 of this invention. It is a flowchart explaining the control operation | movement regarding communication with the portable apparatus by the vehicle equipment side in Embodiment 1 of this invention. It is a flowchart which shows an example of the control which the vehicle equipment side in Embodiment 1 of this invention performs. It is a flowchart which shows an example of the control which the portable device side in Embodiment 1 of this invention performs.

Explanation of symbols

10b Power supply 11a, 11b In-vehicle transmission antenna 12a-12d Out-of-vehicle transmission antenna 17 Transmitter 17a Amplifier (transmitter circuit)
18 Receiving antenna (vehicle equipment)
20 ECU (vehicle equipment)
21 Operation detector (on-vehicle equipment)
50 portable wireless device 52 ECU (mobile wireless device)
51 Operation detector (portable radio)
56 Transmitting antenna (portable radio)
58 Receiving antenna (portable radio)
601 Computer 602 Constant voltage power supply 603 Low-pass filter 604 Switch (waveform switching control means)
Vp Square wave pulse train Vs, Vos Input signal Vo Output

Claims (7)

  Operation control for controlling the operating state of the in-vehicle device when the code request signal is transmitted from the transmitting antenna to the portable device and the return code of the return signal returned from the portable device that has received the code request signal is collated. In the in-vehicle device remote control apparatus having the above-mentioned means, as the driving means for driving the transmitting antenna, a sine wave generating means for generating a sine wave, a rectangular wave generating means for generating a rectangular wave, and a sine generated by the sine wave generating means Waveform switching control means for selecting and deriving either a wave signal or a rectangular wave signal generated by the rectangular wave generating means, and a sine wave signal or a rectangular wave signal selected by the waveform switching control means are input and input An antenna drive control unit including a transmission circuit unit that outputs a transmission antenna drive output of a waveform corresponding to the waveform, wherein the antenna drive control unit is used Vehicle equipment remote control device being characterized in that the said transmitting antenna, to be driven by switching to the sinusoidal wave driving or rectangular wave driving depending on.   The in-vehicle device remote control device according to claim 1, wherein the antenna drive control means switches from sine wave drive to rectangular wave drive when the power supply voltage of the vehicle is lowered.   The in-vehicle driving according to claim 1, wherein the antenna drive control means performs a rectangular wave drive when a main power source of the vehicle is turned off or when a supplementary power source of the vehicle is turned off. Equipment remote control device.   The in-vehicle device remote control device according to claim 1, wherein the sine wave generating means is configured to perform low-pass filter processing on the output of the rectangular wave generating means.   The in-vehicle device remote control device according to claim 1, wherein the antenna drive control unit performs rectangular wave drive when a failure of an antenna drive circuit unit including an antenna unit is detected.   The in-vehicle device remote control device according to claim 1, wherein the antenna drive control means performs rectangular wave drive when the main power of the vehicle is off and the door is locked.   The in-vehicle device remote control device according to claim 1, wherein the antenna drive control unit performs rectangular wave drive when the transmission antenna is used outside the vehicle.

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