JP2002339613A - Noise filling device for evaluating vehicle key-less system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely evaluate the operation of a vehicle key-less system against external noise for operating various types of built-in equipment by a radio remote control. SOLUTION: A control code generated at the control code generating part 12 of a transmitter 50 is inputted into a noise filling device 1 without modulating. When detecting the control code from the transmitter 50, a noise signal output part 2 generates noise signals according to various settings from a PC 4 (whether noise signal is outputted or not, or whether what noise is outputted at what timing). When the noise signal is mixed in the control code by a wired OR 3, the control code added with noise signals is inputted into a body ECU 30 through a bench 40. Thus specified noise can be superimposed, at a specified timing, to the control signal from the transmitter 50, and the operation of the system against the external noise can be surely evaluated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyless system for wirelessly operating various on-vehicle equipment such as a locking / unlocking device provided at a door of a vehicle without using a key. The present invention relates to a noise injection device for evaluating a keyless system of a vehicle, which is used to evaluate the operation of the entire system with respect to the vehicle.

[0002]

2. Description of the Related Art Conventionally, various on-vehicle devices such as a vehicle door lock mechanism and an engine starter are operated wirelessly to lock / unlock a door at a location remote from the vehicle.
Keyless systems that can unlock and start an engine are known. As an example of such a keyless system, FIG. 11 shows a schematic configuration of a keyless entry system that wirelessly opens and closes a door, which is a vehicle-mounted device, and opens a trunk, which is also a vehicle-mounted device.

The keyless entry system illustrated in FIG. 11 includes a transmitter 10, a receiver 20, and a body ECU 30. The transmitter 10 can be built in a so-called master key used by a user to start the engine of the vehicle or open and close a door, or can be configured as a dedicated transmitter separate from the master key.
It includes a control code generator 12, a modulator 13, an amplifier 14, a transmission antenna 15, and an oscillator 16.

The operation switch 11 is directly operated by a user when opening or closing a door or the like.
By operating, each of a door lock / unlock function and a trunk open function can be instructed. The control code generator 12 is provided with the operation switch 1
When 1 is operated, an ID code indicating that the remote control signal (transmitted radio wave) is a code unique to the transmitter 10 is added to the function code corresponding to the function selected by operating the operation switch 11. The control code is output to the modulator 13. The modulator 13 modulates the high-frequency signal output from the oscillator 16 based on the control code. And
This modulated signal is amplified by the amplifying unit 14, and the transmission antenna 1
5 through. This transmitted signal (transmitted radio wave)
Becomes a remote control signal.

A receiver 20, which is a receiving means, includes a receiving antenna 21, a receiving unit 22, and a demodulating unit 23. A remote control signal transmitted from the transmitter 10
1 is received by the receiving unit 22. Then, by demodulating the received signal by the demodulation unit 23, a control code (that is, a control code generated by the control code generation unit 12 of the transmitter 10) is obtained.

The body ECU 30 is a well-known ECU (electronic control unit) equipped with a microcomputer for controlling the operation of various body devices such as locking / unlocking of a door, and a control code from the receiver 20. Is input, and various sensor / switch signals such as an ignition switch and a door courtesy switch are also input. When, for example, a control code for locking the door is input from the receiver 20, the body ECU 30 first extracts an ID code included in the control code,
A comparison is made with a discrimination ID code stored in the body ECU 30 in advance. Then, when both match, and when various conditions for locking the door (for example, all the doors are closed or the key is not inserted into the ignition key cylinder) are satisfied. Only, a drive signal is output to a door lock mechanism (not shown) to lock the door.

In the keyless system configured as described above, it is determined whether or not the system operates normally (ie, whether the body ECU 30 normally operates based on the control code from the receiver 20) at the time of a laboratory or software evaluation. It is necessary to test and evaluate whether or not it works. Therefore, conventionally, for example, by configuring an evaluation system as shown in FIG. 12, the operation of the entire keyless entry system can be evaluated before the body ECU 30 is actually mounted on the vehicle. Hereinafter, the evaluation system of FIG. 12 will be described.

As shown in FIG. 12, a conventional evaluation system for a keyless entry system is for evaluating the operation of a body ECU 30 in a single state before being mounted on a vehicle. The control code is input to the body ECU 30 via the bench 40, and a drive signal output from the body ECU 30 is input to the bench 40. In other words, in the actual vehicle, the body ECU 30 is connected to various sensors / switches of the vehicle and various actuators such as a door lock mechanism and mutually inputs and outputs signals as described with reference to FIG.
In the evaluation system of FIG. 12, the body ECU 30 is connected to the bench 40. In FIG. 12, the transmitter 1
Since the configurations of 0, the receiver 20, and the body ECU 30 are completely the same as those in FIG. 11, the same components as those in FIG. 11 are denoted by the same reference numerals, and the description thereof will be omitted.

The bench 40 is used to evaluate the operation of the body ECU 30, and includes a body ECU such as an ignition switch and a door courtesy switch.
Various sensors, switches, and the like, which are connected when the device 30 is actually mounted on a vehicle, are provided in a pseudo manner. That is, in the actual vehicle, the body ECU 30 has the receiver 20 as described above.
Not only the control code from the controller but also various other signals are input and output. When the control code is input, the body ECU 30
Does not unconditionally perform control based on the control code.For example, even if a control code to lock the door is input, if the door is already open, the control is not executed. Comprehensively controls including the state of the signal.

Therefore, when the keyless entry system is evaluated, accurate evaluation cannot be performed simply by connecting the receiver 20 and the body ECU 30 and inputting only the control code to the body ECU 30. Other signals to be input to the body ECU 30 in the actual vehicle are also generated in a pseudo manner and input to the body ECU 30. That is, by connecting the bench 40, a state equivalent to that actually mounted on the vehicle can be created from the viewpoint of the body ECU 30, and all states assumed in the actual vehicle can be created in a simulated manner. As described above, a drive signal output from the body ECU 30 to an external door lock mechanism in response to the control code is also input to the bench 40. It can be confirmed whether or not the body ECU 30 operates normally (outputs a drive signal for locking the door) in response to a control code (for example, a door lock signal) from the control unit 20.

According to the evaluation system having the above-described configuration, the operation of the operation switch 11 is performed as a function of the keyless entry system.
Is pressed once, the door is locked, and if the button is kept pressed, the window is further closed. When the operation switch 11 is operated in such a manner (one push or continuous push), the body ECU 30 is pressed. The above functions can be evaluated by monitoring the drive signal output from the monitor on the bench 40.

[0012]

However, FIG.
In the evaluation system exemplified in the above, by checking the operation (drive signal output) of the body ECU 30 with respect to the transmission of the remote control signal from the transmitter 10, the general function of the keyless entry system can be confirmed, but the operation with respect to the noise can be confirmed. There is a problem that it cannot be evaluated accurately. Less than,
This will be described in detail.

When a remote control signal is transmitted wirelessly from the transmitter 10 as in a keyless entry system,
Depending on an external electromagnetic environment, noise may be superimposed on the remote control signal, and as a result, a control code input to the body ECU 30 may be abnormal (for example, garbled data or missing bits).

[0014] Therefore, in the keyless entry system, specifications for external noise are generally defined. Specifically, for example, as shown in FIG. 13A, in a keyless entry system in which three frames (each frame is the same) forming a predetermined control code are transmitted when the operation switch 11 is pressed once. If noise is added to all three frames and each frame becomes an abnormal frame, the control code cannot be obtained and the system does not operate. However, noise is added to one or two of the three frames and the frame becomes an abnormal frame. Even after that, there is a specification that the device operates normally as long as the remaining one is normal.

For example, as shown in FIG.
The keyless entry system further includes an operation switch 1
If the user keeps pressing 1, the same frame is transmitted continuously, and when the continuous transmission continues for a predetermined time, the operation switch 11 is kept pressed in a case where some operation (for example, closing a window) is performed. Nevertheless, if noise is added to three consecutive frames on the way and each frame becomes an abnormal frame and the control code cannot be received normally, continuous transmission is interrupted (operation switch 11 is released). It is determined that the transmission is continued (the operation switch 11 is kept pressed) even if noise is added to two consecutive frames and normal reception is not possible. There is also a specification such as.

Therefore, in order to test and evaluate whether or not the keyless entry system operates according to the above-described operation specifications for noise, noise is applied to the remote control signal transmitted from the transmitter 10 by some means. It is necessary to break a control code (frame) transmitted as a remote control signal by superimposing or the like, and it is necessary to superimpose noise of a desired width at a desired timing on the transmitted control code.

However, in the conventional evaluation system shown in FIG. 12, even if noise is simply generated from outside by some means, the noise is generated by a remote control signal transmitted from the transmitter 10 (for example, as shown in FIG. 13). It is difficult to confirm at what timing and how much the same frame is superimposed on the same frame as a result of transmitting the same frame at a predetermined interval). On the other hand, it is practically extremely difficult to reliably superimpose noise at a desired timing and width, such as generating noise that destroys three consecutive frames.

The above problem is not limited to the keyless entry system, but similarly applies to various keyless systems that operate various equipment of the vehicle by transmitting predetermined data (control codes and the like) from the outside by radio. It is extremely difficult to accurately evaluate the operation when an abnormality occurs in the control code due to noise, other than the evaluation of the basic specifications related to the operation of the keyless system.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to reliably evaluate the operation of a system against external noise in a keyless system of a vehicle in which various in-vehicle devices are operated by wireless remote control.

[0020]

According to a first aspect of the present invention, there is provided a noise injection apparatus for outputting a predetermined control code for operating a vehicle-mounted device. A transmitting unit having a modulation output unit that modulates a control code and wirelessly outputs the control code to the outside, a receiving unit that receives a transmission radio wave from the transmitting unit and demodulates the control code, and a control code demodulated by the receiving unit In a keyless system for a vehicle having a control means for controlling the operation of the on-vehicle equipment based on the above, the keyless system is used for evaluating the operation of the control means when noise is superimposed on the transmission radio wave from the transmission means.

In the noise injection device for evaluating a keyless system for a vehicle according to the present invention, the detection means detects the output of the control code from the code output unit, and the noise signal output means comprises:
A noise signal is output at a predetermined timing after the detection means detects the output of the control code. The noise mixing means is configured to mix and output the noise signal and the control code from the code output unit.

That is, in the noise injection apparatus for evaluating a keyless system for a vehicle having the above-described configuration, the control code from the code output section is output to the detection means without being modulated. Then, the detection means detects the output of the control code, and outputs a noise signal at a predetermined timing after the output of the control code (that is, after the detection by the detection means). Then, the noise signal and the control code are mixed by the noise mixing means, and a signal in which the noise signal is superimposed on the control code is output.

When an operation for noise is actually evaluated, a control code on which a noise signal is superimposed, which is generated and output by the noise injection device of the present invention (more specifically, output from the noise mixing means). May be directly input to the control unit without passing through the receiving unit. In other words, considering the purpose of evaluating the operation of the control means with respect to a control code in which an abnormality has occurred due to noise, it is not always necessary to modulate the control code and output it wirelessly as in normal use. That is, it is only necessary to make it possible for the control code input to the CPU to be in an abnormal state due to noise. Therefore, in the present invention, the control code is directly extracted without being modulated, and a noise signal is superimposed on the control code at a predetermined timing and output.

Therefore, according to the first aspect of the present invention,
Since a noise signal can be superimposed on the control code at a desired timing, the operation of the keyless system with respect to external noise can be reliably evaluated. Here, for example, when the operation specifications for external noise in a keyless system differ depending on the type of vehicle, it is necessary to set the output timing of the noise signal according to the type. Also, when evaluating the noise for the same one vehicle, for example, when evaluating a system having the specifications as illustrated in FIG. 13A, the noise signal is transmitted only to the first frame (control code). In order to evaluate the system, such as superimposing, superimposing a noise signal on all other frames other than the second frame, or superimposing a noise signal on all three frames, the output timing of the noise signal Of course, it is necessary to variously change the number of outputs and the like.

Therefore, according to the present invention, at least one of the output timing, the width, and the number of times of output of the noise signal output by the noise signal output means is set to the noise signal. It is preferable that the setting can be arbitrarily set by the setting means, and the noise signal output means operates based on the settings made by the noise signal setting means.

According to the noise injection device having the above configuration, the output timing, width, or number of times of output of the noise signal can be arbitrarily set in accordance with the type of the vehicle, the type of the operation specification for the noise, and the like. Therefore, it is possible to provide a noise injection device having a high performance, and to reliably evaluate the operation of the keyless system with respect to external noise.

By the way, when the keyless system is actually mounted on a vehicle and used, what kind of noise is superimposed on the control code at what timing depends on the usage condition of the vehicle at each time and the surroundings. It is difficult to predict since it differs depending on the electromagnetic environment and the like.

Therefore, in order to more effectively evaluate the operation with respect to external noise, it is preferable that the type (output timing, width, etc.) of the noise signal to be superimposed on the control code is variously changed and evaluated. In this case, the setting content of the noise signal setting means may be changed every time the control code is output. However, in such a method, the noise signal setting means is constituted by a computer, for example, and the user can set the noise signal setting means. If the contents are directly input to the computer, it is necessary for the user to operate the computer to reset the noise signal every time the control code is output, which is very complicated and inconvenient.

Therefore, it is preferable that the output timing or width of the noise signal is changed every time the noise signal is output. That is, claim 3
According to the noise injection device described above, a control code group including one or a plurality of the control codes is output a plurality of times from the code output unit, and the detection unit detects the output of the control code group,
The noise signal output means outputs a noise signal at a predetermined timing after the output of the control code group is detected by the detection means.

The noise signal output means determines at least one of a period from when the output of the control code group is detected by the detection means to when the noise signal is output or a width of the noise signal for a predetermined period for each output of the noise signal. Change step by step. Thus, each time a control code group is output from the code output unit, the output timing or width of the noise signal superimposed on the control code group changes stepwise, so that the operation evaluation for external noise is more effectively performed.・ Can be performed efficiently.

Here, further taking into account that it is impossible to predict at all what kind of noise signal is superimposed on the control code when actually mounted on a vehicle and used,
The superimposition and evaluation of the noise signal according to the present invention is also preferably performed in a situation closer to the actual vehicle, that is, at a timing with no predictability.

Therefore, it is preferable to randomly change the output timing or width of the noise signal as described in claim 4. That is, the noise injection device according to claim 4 includes a random number generation unit that generates a random number, a control code group including one or a plurality of control codes is output from the code output unit a plurality of times, and the detection unit includes Detecting the output of the control code group, the noise signal output means
A noise signal is output at a predetermined timing after the output of the control code group is detected by the detection means.

The noise signal output means generates at least one of a period from when the output of the control code group is detected by the detection means to when the noise signal is output or a width of the noise signal for each output of the noise signal. Set based on random numbers from the means. Thus, each time a control code group is output from the code output unit, the output timing or width of the noise signal superimposed on the control code group changes randomly, so that the evaluation assuming the environment when mounted on a real vehicle is performed. This makes it possible to more effectively and efficiently evaluate operation against external noise.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] FIG. 1 is an explanatory diagram showing a schematic configuration of an entire noise evaluation system for evaluating an operation for external noise in a keyless entry system.

The evaluation system of this embodiment is for evaluating the operation of the keyless entry system of FIG. 11 against external noise, similarly to the evaluation system of FIG. 12 described in the section of the prior art. 1,
It comprises a transmitter 50, a body ECU 30, and a bench 40. The body ECU 30 and the bench 40 have exactly the same configuration as the conventional evaluation system shown in FIG. 12, and the transmitter 50 is basically the same as the transmitter 10 shown in FIG. Since they have the same configuration, the same components as those in FIG. 11 or 12 are denoted by the same reference numerals, and description thereof will be omitted.

The transmitter 50 (corresponding to the transmitting means of the present invention) of the present embodiment is obtained by partially changing the internal wiring of the transmitter 10 of FIG.
The control code (binary data) output from the
3 is inputted to the external noise injection device 1 as it is without being inputted. Therefore, when the operation for noise is evaluated by the noise evaluation system, the modulation unit 13, the amplification unit 14, the transmission antenna 15, and the oscillator 16 included in the transmitter 50 (the modulation output unit of the present invention is realized by these four components). ) Does not work. As a result, no radio wave (remote control signal) is transmitted from the transmitter 50, and only the control code from the control code generator 12 is directly output to the noise injection device 1.

Next, the noise injection device 1 will be described. The noise injection device 1 is for outputting a control code on which noise is superimposed by adding noise to the control code from the transmitter 50. The noise signal output unit 2, the wired OR 3, and the personal computer ( PC) 4. The control code output from the transmitter 50 is input to the wired OR 3 in the noise injection device 1 and also to the noise signal output unit 2.

The PC 4 sends a noise setting command for setting the specifications (output timing, width, number of outputs) of the noise signal generated by the noise signal output unit 2 and a noise signal to the noise signal output unit 2. This is for outputting an output request command to output.

The wired OR 3 is for mixing the control code from the transmitter 50 with the noise signal generated by the noise signal output unit 2 and outputting the mixed signal. In the present embodiment, a known logic gate (wired OR) is used. OR). That is, the wired OR 3 of the present embodiment outputs the logical sum of the input control code and the noise signal. For example, when the noise signal is at the Low level (that is, when there is no noise), the control code is not changed. When the noise signal is at the high level (that is, when noise is generated), a high-level signal is always output to the bench 40 regardless of the state of the control code. That is, the noise signal (High
When a level signal is output, a control code on which the noise signal is superimposed is output.

The noise signal output unit 2 outputs a noise signal of a predetermined width and number of outputs based on a noise setting command from the PC 4 and a control code input from the transmitter 50 only when there is an output request command from the PC 4. Is configured as a well-known microcomputer for generating and outputting to the wired OR 3 at a predetermined timing. As shown in FIG. 2, the input interface 2a, the CPU 2b, and the R
OM 2c, RAM 2d, output interface 2e, and power supply unit 2f. The power supply unit 2f converts a voltage VB from an external power supply (not shown) (such as a commercial power supply or a battery) into a voltage (Vcc: in this embodiment) required to operate each component in the noise signal output unit 2. 5V)
Is converted and output.

When a noise setting command and an output request command are input from the PC 4 to the noise signal output unit 2, they are stored in the RAM 2d via the input interface 2a. RAM2
When a new noise setting command is output from the PC 4 or the output request command is released, the storage content of d is changed accordingly.

On the other hand, the control code from the transmitter 50 is also input to the inside (CPU 2b) via the input interface 2a.
If an output request command is issued from the CPU 2 (that is, if the output request command is stored in the RAM 2d), the CPU 2b similarly generates a noise signal based on the content (noise specification) of the noise setting command from the PC 4. Hereinafter, generation of a noise signal in the noise signal output unit 2 will be described with reference to FIGS.
It will be described based on.

FIG. 3 is a flowchart showing a noise signal generation process executed by the CPU 2b. FIG. 4 is an explanatory diagram showing examples of various noise signals added to the control code. In the noise signal output unit 2 of the present embodiment, the CPU 2b
Reads a noise signal generation processing program from the ROM 2c and executes processing in accordance with the program. This process is repeatedly executed at a predetermined cycle.

In the following description, as a specification of the noise signal to be generated, for example, the noise signal C in FIG.
As an example, when a plurality of the same frames are output, the period from the first frame input to the output of the noise signal is T1, the width of the noise signal (High level signal) is T2, and the output of the noise signal is T2. The number of times is two, and the interval between each noise signal is T3 (in other words, the period from the first frame input to the output of the second noise signal is T3).
A description will be given assuming that a noise setting command to set the value to 1 + T3) is input from the PC 4 and stored in the RAM 2d.

When this process is started, first, in step (hereinafter abbreviated as "S") 110, it is determined whether a control code has been input (ie, whether a control code has been output from transmitter 50). to decide. This determination is repeated until the control code is input, but the control code is output by operating the operation switch 11 (see FIG. 11) provided in the transmitter 50, and when this is input to the CPU 2b (S
110: YES, time t0), and proceeds to S120. S
At 120, it is determined whether or not there is a noise signal output request command from the PC 4. If not, the process returns to S110 again.
If there is an output request command (S120: YES), S
The process proceeds to S130, where the counter N is set to “1”, and the subsequent S
At 140, the timer Ta is set, and the routine goes to S150.

In S150, the timer Ta determines whether or not the period T1 specified by the noise setting command from the PC 4 has elapsed, that is, from the time t0 when the control code is input to T1.
It is determined whether or not has elapsed, and when T1 has elapsed (S15
0: YES, time t1), the timer Tb is set in S160, and the output of the noise signal is started in S170. That is, the CPU 2b outputs a noise signal via the output interface 2e.

In S180, the elapsed time from the time when the output of the noise signal is started in S170 (time t1) is determined based on the timer Tb, and the timer Tb is set in the period designated by the noise setting command from the PC4. When (the width of the noise signal) T2 has elapsed (S180: YES), S19.
After the transition to 0, the output of the noise signal is stopped. And S
At 200, it is determined whether or not the value of the counter N matches the number of noise outputs specified by the noise setting command from the PC 4.

Here, since the number of noise outputs is set to, for example, two, as described above, a negative determination is made in S200 and the process proceeds to S210. Then, in S210, the timer Tb determines whether or not the interval T3 between the noise signals instructed by the noise setting command from the PC 4 has elapsed, and when T3 has elapsed (S210: YES,
At time t2), that is, when T3 has elapsed from time t1 at which the first noise signal was output, the flow proceeds to S220 to reset all the timers Ta and Tb, and continues at S23.
The counter N is incremented by 0, and the process proceeds to S160.

Thereafter, the processing of S160 to S190 is as described above, the noise signal is output again only for the period T2, and the process proceeds to S200. Then, in S200, it is determined whether or not the value of the counter N matches the preset number of times of noise output. At this time, the counter N is set to “2” by the increment of S230,
Since this value matches the command value (twice) from PC4, this process ends.

That is, for the control code (three frames in this example), the noise signal having the width T2 is output twice, and the output timing of each noise signal is set as follows.
The first time is when the period T1 has elapsed since the control code was input,
In the second time, each noise signal is output after a lapse of period T1 + T3 from the input of the control code.

As described above in detail, in the noise injection device 1 of the present embodiment, the noise signal output unit 2 receives the control code input (when the same frame is output a plurality of times or when one control code is output from the plurality of frames). When the signal is divided and output, the input of the first frame) is detected, and based on various commands (noise setting command) and output request command from the PC 4, a noise signal of an arbitrary width is output at an arbitrary timing. , Generated and output.

In the above description (the description of the flowchart in FIG. 3), the description has been made on the assumption that the noise signal C illustrated in FIG. 4 is generated. In the setting instruction, the number of times of output of the noise signal may be set to one. For example, when it is desired to generate the noise signal B, the number of times of output of the noise signal may be set to one and the width of the noise signal may be set to T2 '. What is necessary is just to output a noise setting command corresponding to the noise signal to be generated from the PC 4.

The noise signal generated in the noise signal output unit 2 is input to the wired OR 3, mixed with the control code also input to the wired OR 3, and input to the body ECU 30 via the bench 40. You. Therefore, while the noise signal is being output (ie,
While the high-level signal is being input to the wired OR 3 from the noise signal output unit 2), the high-level signal is output to the body ECU 30 regardless of the state of the control code. Is input to the body ECU 30.

Then, as described above, other various sensor / switch signals are generated on the bench 40 to generate the body EC.
By outputting to U30, if the body ECU 30 is brought into a state equivalent to the state mounted on the actual vehicle, the operation of the body ECU 30 with respect to the control code (abnormal control code) on which the noise signal is superimposed can be confirmed and evaluated. .

Therefore, according to the noise evaluation system of this embodiment, the noise injection device 1 can output a noise signal at an arbitrary timing with respect to the control code from the transmitter 50 and mix it with the control code. Therefore, the operation specification (see FIG. 13) of the body ECU 30 when the external noise is superimposed on the control code and becomes abnormal can be reliably evaluated.

Further, since the output timing, width, and number of times of output of the noise signal can be arbitrarily set by the PC 4, the versatility is improved, and the operation of the body ECU 30 with respect to external noise is more efficiently evaluated. Can be. Further, in the present embodiment, the control code from the transmitter 10 is not output wirelessly, but is taken into the noise injection device 1 in the state of the control code itself, where the noise signal is superimposed and output to the bench 40. . That is, the devices and the like that constitute the noise evaluation system are interconnected by wires. Therefore, as compared with the case where evaluation is performed by wireless output from the transmitter 10, the influence of noise from the outside other than the present noise evaluation system can be reduced, and operation evaluation for noise can be performed more accurately.

Here, the correspondence between the components of the present embodiment and the components of the present invention will be clarified. In the present embodiment, the control code generator 12 corresponds to a code output unit of the present invention, and the body ECU 30 corresponds to control means of the present invention.
The noise signal output unit 2 corresponds to the detection means and the noise signal output means of the present invention, the wired OR 3 corresponds to the noise mixing means of the present invention, and the PC 4 corresponds to the noise signal setting means of the present invention.

In the noise signal generation processing of FIG. 3, the processing of S110 corresponds to the processing executed by the detecting means of the present invention, and the processing after S120 corresponds to the processing executed by the noise signal outputting means of the present invention. . [Second Embodiment] In the first embodiment, the output timing (specifically, T1 and T3) and the width (T
2) Although it has been described that an arbitrary noise signal can be output by setting the noise specification such as the number of outputs on the PC 4, the operation of each specification is changed by changing the specification of the noise signal to be superimposed on the control code. When trying to evaluate, every time a control code is output, different noise specifications are set one by one from the PC 4, which is very complicated and inconvenient.

For this reason, in this embodiment, first, the PC 4
By setting the noise specifications, noise signals having different output timings and widths are output each time a control code is output. The evaluation system of the present embodiment has exactly the same configuration as the evaluation system of the first embodiment shown in FIGS. 1 and 2 except that the contents of the noise signal generation processing program stored in the ROM 2c are different. Therefore, the present embodiment will be described with reference to FIG. 1 or FIG. 2 as appropriate.

A control code is output by operating the operation switch 11 provided in the transmitter 50, and the control code (frame) is input to the noise signal output unit 2 in the noise injection device 1 (one operation of the operation switch 11). When a plurality of frames are output, when the first frame is input (input of the first frame), the noise signal output unit 2 generates and outputs a noise signal. In the present embodiment, after the control code is input (that is, the control code is generated). The period from when the control code output from the unit 12 is detected by the noise signal output unit 2 until the noise signal is output (hereinafter referred to as “output start period”) or the noise signal width is set every time the control code is input. Sweep (increase). Hereinafter, the output start period or the width sweep will be described in detail.

In the present embodiment, when either the output start period or the width is swept to evaluate the operation, a noise setting command to that effect is output from the PC 4 so that the state of the noise signal output unit 2 is changed. Is set to the sweep mode, and which of the output start period and the width is swept can be set as a noise setting command from the PC 4. (I) When Sweeping the Noise Signal Output Start Period FIG. 5A is a flowchart illustrating a noise signal generation process (when the noise signal output start period is swept) executed by the CPU 2b. In the present embodiment, the program for executing this noise signal generation processing is R
It is stored in the OM 2c, and the CPU 2b executes processing according to this program.

In the following description, as illustrated in FIG. 7A, a control code (control code group; total length Tn) of three frames is output by operating the operation switch 11, and a noise signal in the sweep mode is output. As a specific specification, T1init is an output start period from when the control code group is first input to the noise signal output unit 2 until the noise signal is output, and thereafter, the output of the noise signal starts every time the control code group is input. The sweep time when the period is swept is T1sweep, the width of the noise signal is T2, the maximum value of the period from the input of the control code group to the output of the noise signal is T1max, and the total length of the control code group is Tn. A description will be given assuming that a noise setting command to that effect is input from the PC 4 and stored in the RAM 2d. In this example, T
1max = Tn is set.

When this process is started, first, in S510, a noise signal output start period T1 after the control code group is input.
Is set to an initial value T1init. Then, the flow shifts to S600, where a noise signal output process is executed. The details of S600 are as shown in FIG. 6, which corresponds to FIG. 3 of the first embodiment.
S610 and S620 are executed after the processing of S110 to S190 (except for S130) in the flowchart of FIG. Therefore, FIG.
The same processes as those described above are denoted by the same reference numerals, and description thereof will be omitted.

That is, in the noise signal output of S600, if a control code group is input (that is, a control code is input) and an output request command is output from the PC 4 at that time, a noise having a width T2 after a lapse of T1 (T1init). A signal is output (S110 to S190). After the output of the noise signal is stopped, in S610, it is determined whether or not the period Tn has elapsed since the input of the control code group. If it has not elapsed, this process is repeated. Then, both the timers Ta and Tb are reset, and the subsequent S520
Processing proceeds to That is, at this point, the first noise signal output process for the control code group (first noise signal output shown in FIG. 7A) is completed.

In S520, the current output start period T1
By adding T1sweep to (T1init), a period in which the previous output start period T1 is swept by T1sweep is set as a new output start period T1. Then, in S530, the newly set output start period T
It is determined whether or not 1 is larger than the maximum value T1max set by the PC4.
0, and returns the same noise signal output processing as described above (however, S5
20 based on T1 set in step 20).

Until the output start period T1 becomes longer than T1max, a noise signal is output while the output start period T1 is increased by T1sweep every time a control code group is input (second to N in FIG. 7A). Time), but T1 is T1max
If it becomes larger, an affirmative determination is made in S530 and S510
The following processing is performed. In other words, the sweep of T1
After the operation is performed until T1> T1max, T1 is reset to the initial value T1init again, and the same processing is performed thereafter. Therefore, when a control code is subsequently input, a noise signal is output again at the first timing shown in FIG. (Ii) Case of Sweeping Width of Noise Signal Next, FIG. 5B shows a noise signal generation process executed by the CPU 2b (case of sweeping the width of a noise signal).
It is a flowchart showing. A program for executing this noise signal generation processing is also stored in the ROM 2c, and when the width of the noise signal is swept, the CPU 2
b executes processing according to this program.

In the following description, as shown in FIG. 7B, a control code (control code group; total length Tn) of three frames is output by operating the operation switch 11, and a noise signal in the sweep mode is output. As the specification of
The output start period of the noise signal is T1, the width of the first noise signal is T2init, and the sweep time for sweeping the width of the noise signal every time a control code group is input is T2sweee.
A description will be given on the assumption that a noise setting command for setting p, the maximum value of the noise signal width to T2max, and the total length of the control code group to Tn is input from the PC 4 and stored in the RAM 2d. In this example, T1 is set to 0, that is, a noise signal is output immediately after the control code is input.

When this process is started, first, in step S560, the width T2 of the noise signal is set to an initial value T2init. Then, the flow shifts to S600, where the same processing as described above (the description of S600 in FIG. 5A) is performed based on the initial value of T2 and other various set values set in the PC 4. This means that the noise signal output processing for the first control code group (first noise signal output shown in FIG. 7B) has been completed.

In the subsequent S570, the current noise signal width T
By adding T2sweep to 2 (T2init), the width obtained by sweeping the previous noise signal width T2 by T2sweep is set as a new width T2. And S580
Then, it is determined whether or not the newly set noise signal width T2 is larger than the maximum value T2max set by the PC4. If it does not exceed T2max, the process returns to S600,
The same noise signal output processing (processing based on T2 set in S570) is performed.

Until the noise signal width T2 becomes larger than T2max, the noise signal is output while increasing (sweeping) T2 by T2sweep for each input of the control code group (second to third in FIG. 7B). Time), but T2 is T2max
If it becomes larger (in this example, T2 is set to exceed T2max by the third sweep), S5
An affirmative determination is made in 80, and the processing of S560 and subsequent steps is executed again. That is, after the sweep of T2 is performed until T2> T2max, T2 is set to the initial value T2init again, and the same processing is performed thereafter. for that reason,
When a control code is input after this, FIG.
A noise signal is output at the first timing shown in FIG.

As described above, in this embodiment, every time a control code group is input, a noise signal whose output start period or width is swept by a predetermined sweep amount is output. Thereby, when it is desired to generate various noise signals having different output timings and widths to evaluate the operation of the keyless entry system, the PC 4 is operated for each noise signal and the noise setting command is not output, and the noise setting command is not output. A noise signal can be generated, which greatly reduces the complexity and inconvenience of system evaluation, and operates the keyless entry system even if noise is superimposed on any part of a normal remote control signal (control code). As long as (noise resistance) is satisfied, it can be reliably evaluated that there is no influence on communication.

Each of the processes shown in FIGS. 5A and 5B corresponds to the process executed by the noise signal output means of the present invention. However, the processing of S120 in the noise signal output processing of S600 corresponds to the processing executed by the detection unit of the present invention. Third Embodiment In the above-described second embodiment, a case has been described in which the output start period or width of the noise signal is swept by a predetermined sweep amount. However, in an actual vehicle, the generation of the noise signal is irregular. Considering that it is almost impossible to predict what width of a noise signal will occur at what timing, it is preferable to generate a more random noise signal and evaluate the system. .

Therefore, in the present embodiment, the noise specification is first set by the PC 4, and thereafter, every time a control code group is output, the output start period or the noise signal width is randomly changed. The evaluation system of the present embodiment is different from the first embodiment shown in FIG. 1 except that the content of the noise signal generation processing program stored in the ROM 2c and the configuration of the noise signal output unit (specifically, the configuration of the CPU) are different.
Since the configuration is completely the same as the evaluation system of the embodiment,
This embodiment will also be described with reference to FIG. FIG. 8 shows a schematic configuration of the noise signal output unit 80 of the present embodiment. Noise signal output unit 80 of the present embodiment
Has exactly the same configuration as the noise signal output unit 2 of FIG. 2 except that the configuration of the CPU is different. Therefore, the same reference numerals as those in FIG.

The CPU 81 of this embodiment includes a free-run timer 81a and a random number generator 81b. The random number generator 81b is a well-known device that generates random numbers according to a predetermined algorithm, and may be any device that can generate random numbers in a desired range. In the present embodiment, a predetermined function (random number generation formula) is used. It is configured to generate a random number based on this. When the function is used, seed (the initial value of the random number generation equation) is required. Therefore, the value of the free-run timer 81a is used as the seed. The free-run timer 81a is
This is a well-known free-run timer (free-run counter) normally provided in a general microcomputer.

In the CPU 81, a random number generator 81
By using the random number generated in b as the output start period or width of the noise signal, the output of a random noise signal is realized. In the case where the operation evaluation is performed by randomly setting either the output start period or the width as in the present embodiment, a noise setting command to that effect is output from the PC 4 to change the state of the noise signal output unit 2. In addition to the random mode, which of the output start period and the width is randomly changed can be set as a noise setting command from the PC 4.

In addition, as a noise setting command in the PC 4, data (range data) for setting the output start period or width of the noise signal set at random within a predetermined range is also set. For example, when the output start period is randomly changed, the minimum value and the maximum value are set, or when the noise signal width is changed randomly, the maximum value and the minimum value are set.

Therefore, the range data set by the PC 4 is input to the random number generator 81b.
b is configured to output only random numbers within the range set by the range data. Hereinafter, the random setting of the output start period or the width of the noise signal will be described in detail. (I) Case of randomly changing the output start period of the noise signal FIG. 9A is a flowchart showing the noise signal generation process (when the noise signal output start period is set randomly) executed by the CPU 81. In the present embodiment, the program for executing this noise signal generation processing is R
It is stored in the OM 2c, and the CPU 81 executes processing according to this program.

In the following description, FIG.
As shown in FIG. 2, a control code (control code group; total length Tn) of three frames is output by operating the operation switch 11, and as a specific specification of the noise signal in the random mode, the control code is first sent to the noise signal output unit 2. A noise setting command that the minimum value of the output start period T1 from the input of the group to the output of the noise signal is T1min, the maximum value is T1max, the width of the noise signal is T2, and the total length of the control code group is Tn. Are input from the PC 4 and stored in the RAM 2d. In this example, T
1max = Tn is set.

When this process is started, first, in S910, an output start period T1 is obtained from the random number generator 81b. Since the random number generator 81b generates a random number within the range of the minimum value T1min to the maximum value T1max according to the setting from the PC 4, this random number is output to the noise signal output start period T1.
It is used as.

Then, the flow shifts to S600, where a noise signal output process is executed. The details of S600 are as shown in FIG. 6 and have already been described in the second embodiment. Therefore, detailed description thereof is omitted here, but the output start period T1 (random value) acquired from the random number generator 81b. And PC4
, A noise signal is generated and output based on the various settings, and as a result, the first noise signal output shown in FIG. 10A is performed.

After outputting the noise signal as described above, the process returns to S910 again, acquires the random number from the random number generator 81b, and executes the subsequent process of S600. By repeating this, the second and subsequent noise signals shown in FIG. 10A are sequentially output. (Ii) When Randomly Changing the Width of the Noise Signal Next, FIG. 9B is a flowchart illustrating a noise signal generation process (when the width of the noise signal is randomly changed) executed by the CPU 2b. A program for executing the noise signal generation processing is also stored in the ROM 2c, and when the width of the noise signal is randomly changed,
The CPU 2b executes processing according to this program.

In the following description, FIG.
As shown in the example, a control code (control code group; total length Tn) of three frames is output by operating the operation switch 11, and the control code group is first output to the noise signal output unit 2 as a specification of the noise signal in the random mode. The output start period from the input to the output of the noise signal is T
1. A description will be given on the assumption that a noise setting command for setting the minimum value of the noise signal width T2 to T2min, the maximum value to T2max, and the total length of the control code group to Tn is input from the PC 4 and stored in the RAM 2d.

When this process is started, first, in S960, the noise signal width T2 is obtained from the random number generator 81b. Since the random number generator 81b generates a random number in the range from the minimum value T2min to the maximum value T2max according to the setting from the PC 4, this random number is used as the width T2 of the noise signal. Then, the flow shifts to S600, where a noise signal output process is executed. That is, generation and output of a noise signal based on the width T2 (random value) obtained from the random number generator 81b and various settings by the PC 4 are executed, and as a result, the output of the first noise signal shown in FIG. Will be done.

After outputting the noise signal in this manner, the process returns to S960 again to obtain the random number from the random number generator 81b and execute the subsequent process of S600. By repeating this, the second and subsequent noise signals shown in FIG. 10B are sequentially output.

As described above, in the present embodiment, each time a control code group is input, a noise signal is output such that the output start period or width randomly changes within a predetermined range. For this reason, since various noise signals having different specifications can be generated, the complexity of system evaluation and the inconvenience of use are greatly reduced, and the superimposition (estimation) of the noise signal assumed when the keyless entry system is mounted on an actual vehicle is achieved. Difficulty) can be considered and an effective evaluation closer to the actual environment becomes possible.

In this embodiment, the random number generator 81
b corresponds to the random number generating means of the present invention, and FIG.
Each of the processes shown in (b) (except the process of S120 in the noise signal output process of S600) corresponds to the process executed by the noise signal output means of the present invention.

The embodiments of the present invention are not limited to the above embodiments, and it goes without saying that various embodiments can be adopted as long as they fall within the technical scope of the present invention. For example, in the first embodiment, as a specification of the noise signal generated by the noise signal output unit 2, the control signal is first output after the control code is output (in other words, after the control code is detected by the noise signal output unit 2). The period until the noise signal is generated (T1), the width of the noise signal (T2), the number of times the noise signal is output, and the interval between the noise signals (T3) can be arbitrarily set. In the case of outputting the noise a plurality of times, the width of each noise may be changed. In the case of outputting the noise signal three or more times, the interval T3 between the noise signals is set every time the noise signal is output. You may change it.

In the second embodiment, the case where the output start period or the width of the noise signal is swept is shown, and in the third embodiment, the case where the output start period or the width is randomly changed is shown. The present invention is not limited to this. For example, the sweep of the output start period and the sweep of the width may be performed simultaneously, or the random change of the output start period and the random change of the width may be performed simultaneously. Further, for example, various modes such as sweeping the output start period and randomly changing the noise signal width at the same time as sweeping the output start period or randomly changing the output start period and sweeping the noise signal width can be adopted. Although the example in which the output period or the sweep of the width is increased by a predetermined period has been described, the invention is not limited to this, and the sweep may be decreased by a predetermined period.

Further, in each of the above embodiments, the noise signal output unit 2 is constituted by a microcomputer. However, the present invention is not limited to this. For example, the noise signal output unit 2 may be constituted by an analog circuit using a comparison circuit or a delay circuit. The configuration is not particularly limited as long as a desired noise signal can be generated and superimposed on the control code. For the wired OR3, for example, AND
The configuration is not particularly limited, such as being configured by another logic gate such as a gate.

Further, the noise setting command and the output request command for the noise signal output unit 2 are output from the PC 4, but the noise signal output unit 2 has the same function as the PC 4 and the user can actually The noise signal output unit 2 also includes various setting switches and the like for setting (that is, the noise signal output unit 2 and the PC 4 are integrated).
It may be configured as follows.

In each of the above embodiments, the present invention
The case where the operation of the keyless entry system that can wirelessly operate the door lock of the vehicle with respect to noise has been described as an example has been described. However, the present invention is not limited to door lock / unlock. The present invention can be applied to any system that operates vehicle equipment by wireless operation in a vehicle, such as application to a so-called wireless engine starter system performed by remote operation.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of an entire evaluation system for evaluating an operation with respect to external noise in a keyless entry system.

FIG. 2 is an explanatory diagram illustrating a schematic configuration of a noise signal output unit.

FIG. 3 is a flowchart illustrating a noise signal generation process executed by a CPU according to the first embodiment.

FIG. 4 is an explanatory diagram showing examples of various noise signals added to a control code according to the first embodiment.

FIG. 5 is a flowchart illustrating a noise signal generation process performed by a CPU according to a second embodiment, where (a) illustrates a case where a noise signal output start period is swept, and (b) illustrates a case where the noise signal output start period is swept.
Indicates a case where the noise signal width is swept.

6 is S600 in the noise signal generation processing of FIG.
5 is a flowchart showing details of a noise signal output process of FIG.

FIGS. 7A and 7B are explanatory diagrams showing a state in which a noise signal is superimposed on each of a plurality of control code groups output a plurality of times in the second embodiment, and FIG. , (B) respectively show the case where the noise signal width is swept.

FIG. 8 is an explanatory diagram illustrating a schematic configuration of a noise signal output unit according to a third embodiment.

FIG. 9 is a flowchart illustrating a noise signal generation process executed by the CPU according to the third embodiment. FIG. 9A illustrates a case where a noise signal output start period is randomly changed.
(B) shows the case where the noise signal width is changed randomly.

FIG. 10 is a diagram illustrating a state in which a noise signal is superimposed on each of a plurality of control code groups output multiple times according to the third embodiment. (B) shows the case where the noise signal width is changed randomly.

FIG. 11 is an explanatory diagram showing a schematic configuration of a conventional keyless entry system.

FIG. 12 is an explanatory diagram showing a schematic configuration of an entire evaluation system for evaluating the operation of a conventional keyless entry system.

FIG. 13 is an explanatory diagram showing an operation specification example of a keyless entry system when a noise signal is superimposed on a control code.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Noise injection device, 2, 80 ... Noise signal output part, 2
a ... input interface, 2b, 81 ... CPU, 2c ...
ROM, 2d RAM, 2e output interface, 2
f: Power supply unit, 3: Wired OR, 4: Personal computer (PC), 10, 50: Transmitter, 11: Operation switch, 12: Control code generation unit, 13: Modulation unit, 14
... Amplifier, 15 ... Transmission antenna, 16 ... Oscillator, 20 ...
Receiver 21, receiving antenna 22, receiving section 23, demodulating section 30, body ECU 40, bench, 81a free-run timer, 81b random number generator

Continued on the front page (72) Inventor Shuichi Nitta 1-1-1, Showa-cho, Kariya-shi, Aichi F-term in DENSO Corporation (reference) 2E250 AA21 BB08 BB21 CC00 CC20 FF00 FF22 HH01 JJ00 JJ03 KK03 LL01 SS00 SS11 5K048 AA06 BA42 BA53 DB01 DC01 EA01 EB02 GB01 HA04 HA06

Claims (4)

[Claims] 1. A transmitting means comprising: a code output section for outputting a predetermined control code for operating an in-vehicle device; a modulation output section for modulating the control code and wirelessly outputting the modulated code to the outside; A keyless system for a vehicle, comprising: receiving means for receiving the transmission radio wave and demodulating it into the control code; and control means for controlling the operation of the onboard equipment based on the control code demodulated by the receiving means. A noise injection device used to evaluate the operation of the control unit when noise is superimposed on a transmission radio wave, wherein the detection unit detects an output of a control code from the code output unit; Noise signal output means for outputting a noise signal at a predetermined timing after the output of the code is detected; and a control signal from the code output unit, wherein the noise signal A noise injection device for evaluating a keyless system for a vehicle, comprising: a noise mixing device that mixes and outputs a noise signal from an output device. 2. The noise injection device for evaluating a keyless system for a vehicle according to claim 1, further comprising at least one of an output timing, a width, and an output frequency of a noise signal output by said noise signal output means. A noise injection device for evaluating a keyless system for a vehicle, comprising: a noise signal setting unit that can arbitrarily set one of the noise signal setting units; and the noise signal output unit operates based on the setting contents of the noise signal setting unit. 3. A control code group including one or a plurality of control codes is output from the code output unit a plurality of times, and the detecting unit detects an output of the control code group from the code output unit. The noise signal output unit outputs the noise signal at a predetermined timing after the detection unit detects the output of the control code group, and the detection unit detects the output of the control code group. 3. The vehicle according to claim 1, wherein at least one of a period until the noise signal is output and a width of the noise signal is changed stepwise by a predetermined period for each output of the noise signal. 4. Noise injection device for keyless system evaluation. 4. The noise injection device for evaluating a keyless system for a vehicle according to claim 1, further comprising: a random number generation unit configured to generate a random number. A control code group including a control code is output a plurality of times, the detection unit detects an output of the control code group from the code output unit, and the noise signal output unit detects the output of the control code group by the detection unit. The noise signal is output at a predetermined timing after the output is detected, and at least a period from the detection of the output of the control code group to the output of the noise signal by the detection unit or the width of the noise signal. A noise injection device for evaluating a keyless system of a vehicle, wherein one of the noise injection devices is set based on a random number from the random number generating means for each output of the noise signal. .