JPH08289372A - Control data transmission equipment - Google Patents

Abstract

PURPOSE: To simplify the constitution by sharing the microcomputer used for another processing like multiplex communication processing. CONSTITUTION: The signal level of a key code (control data) outputted from an electronic key 5 is sampled at intervals of a certain time to add a signal (additional signal), which can distinguish between noise and a remote control signal, to the head of the key code. On the reception side, a microcomputer 9 is provided with a means which separates the initial noise by sampling at intervals of a certain time and analyzes the key code by a function, which measures the pulse edge width of the remote control signal, after confirmation of the signal from the electronic key 5, and a start permission signal is sent to a controller 4 after collation of the ID number. Since the remote control signal from the electronic key 5 is surely discriminated without an influence of the noise, this equipment can be applied to a keyless entry system of a vehicle like an automobile to not only easily obtain a high reliability but also reduce the processing burden of a microcomputer for keyless entry.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control data transmission device for a remote controller using electromagnetic waves, and more particularly to a control data transmission device suitable for a keyless entry system for automobiles.

[0002]

2. Description of the Related Art There is a method of using a sound wave (ultrasonic wave) and an electromagnetic wave as a transmission form for transmitting a signal for a remote control (remote operation), that is, control data by wireless, and further, as an electromagnetic wave, A method of using light (infrared ray) and a method of using radio waves are known, but in any case, protection against noise is required. Particularly, when radio waves are used, the noise environment is significantly deteriorated due to the current state of use of various electric devices, and sufficient noise countermeasures are required.

Therefore, in the prior art, for example, Japanese Patent Laid-Open No. 2-179.
As described in Japanese Patent Publication No. 096, when the received signal is determined to be noise, the sensitivity of the receiver is lowered.

[0004]

The above-mentioned prior art cannot be said to give sufficient consideration to the reliable detection of the remote control signal, and the sensitivity of the receiver is reduced, so that the original remote control is considered. There was a problem that even the signal was overlooked.

An object of the present invention is to provide a control data transmission device which can surely distinguish noise from remote control signals without degrading the sensitivity of the receiver.

[0006]

SUMMARY OF THE INVENTION The above object of the present invention is to provide a control data transmission device which is adapted to judge the validity of a received signal by a predetermined additional signal added to the head of the signal. The determination means for detecting the presence of the additional signal by sampling the generated signal at regular time intervals and the data recognition means for recognizing the control data by measuring the pulse width of the received signal are provided. When the determination result is affirmative, the control data recognition process by the data recognition means is started.

That is, according to the present invention, in order to achieve the above object, the key code (control data) output by the transmitter is output a plurality of times, and the signal level of the remote controller is sampled at regular intervals to thereby reduce noise. A signal that can be recognized as a remote control signal (additional signal) is added to the beginning of the key code, and on the receiving side, the initial noise is separated by means of sampling at regular intervals, and the signal must be from the remote control. After confirming, the means for analyzing the key code is executed by the function of measuring the pulse edge width of the remote control signal.

At the time when the pulse edge is detected, the signal level of the input pulse edge is confirmed (the rising edge is high level, and the falling edge is low level. It can be said that it is noise.) A means for removing high frequency noise and the signal pattern of the key code that is known in advance are positively recognized, and by comparing the signals input multiple times, the The noise that cannot be removed by the means for removing the high frequency noise can be ignored. The reliability of the key code data can be compensated for by collating the key code input a plurality of times.

[0009]

[Function] By using the signal detection method based on the sampling theorem and the signal detection method for measuring the time between pulse edges, the weak points of both can be compensated, and it can be determined whether it is noise or a signal. You can

Further, noise can be eliminated by reconfirming the level of the input signal. Furthermore, since the pattern of the input signal is known,
By positively extracting only a specific pattern, it is possible to recognize a signal even if it has a lot of noise. The reliability of the recognized signal can be ensured by comparing the signals input a plurality of times.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The control data transmission device according to the present invention will be described in detail below with reference to the illustrated embodiments. FIG. 1 is an embodiment in which the present invention is applied to a keyless entry system for an automobile. In this embodiment, as shown in the drawing, a BCM 1 for controlling electric components in the vehicle by multiplex communication, and a predetermined vehicle. It is composed of LCUs 2 and 3 which are arranged at the location, perform multiplex communication with the BCM 1, operate electric components of the vehicle, and take in signals from necessary devices, and the engine control unit 4.

Reference numeral 5 is an electronic key, and 6 is an antenna. BCM is an abbreviation for body control module, and LCU is an abbreviation for local control unit.

The BCM 1 is a radio wave captured by the antenna 6.
Tuner 7 for demodulating (signal), EEPROM (ROM capable of electrically erasing data) 8, microcomputer 9, communication I
It is composed of a C (communication circuit integrated into an IC) 10 and the like, and controls the electric components of the vehicle and starts the engine based on the information given from the electronic key 5.

The LCUs 2 and 3 are provided on the driver side door and the passenger side door, respectively.
Built-in, and is connected to BCM1 by communication line 16,
The information from the switches 18 and 20 for detecting the locked state of the door is transmitted to the BCM 1, and the door lock actuators 17 and 19 are driven and controlled by the signal from the BCM 1.

The engine control unit 4 includes an EEPROM 11
And a microcomputer 12 and I / O (input / output device) 13 and the like, and is connected to the BCM 1 by a communication line 15.
In response to various signals representing the operating state of the engine, such as the crank angle signal input via the I / O 13, various control signals such as an ignition signal necessary for controlling the engine are generated to control the engine. To do.

The electronic key 5 is a switch that is inserted into a vehicle door key cylinder or is provided on the electronic key itself.
By operating the (push button switch), the electronic key has a function of transmitting an individual ID (identification) number and a code representing the switch operated at that time as a radio signal.

Therefore, if any switch of the electronic key 5 is operated and a radio wave is transmitted, this radio wave is received by the antenna 6, the signal is demodulated by the tuner 7 and supplied to the microcomputer 9, where Signal analysis is performed at.

Next, the result of this signal analysis and the EEPR
The ID number stored in the OM8 is compared, and if the ID numbers match, the signal at this time is determined to be a signal from a legitimate electronic key, that is, a signal from the owner of this vehicle. First, a start permission signal is transmitted to the engine control device 4.

The activation permission signal is changed every time the electronic key 5 is removed from the key cylinder, and the engine control unit 4
, And the same data is stored in the EEPROMs 8 and 11 by transmitting and receiving data between the BCMs 1, respectively.

The engine control unit 4 limits the operation by a start permission signal. That is, if the ID number of the electric wave emitted from the electronic key 5 is correct, the BCM 1 transmits the activation permission signal previously stored in the EEPROM 8 to the engine control device 4, and the engine control device 4 transmits the received activation permission signal to the EEPROM 11. If it matches the stored activation permission signal, it operates normally, and if it does not match, the operation is stopped. Therefore, this means that only the owner of the vehicle can start the engine.

On the other hand, if the ID number from the electronic key 5 is correct, the BCM 1 sends LCUs 2 to 3 via the communication IC 10.
Start multiplex communication with. Each LCU is arranged at the front door of the vehicle, and has a function of reading data indicating the states of the switches 18 and 20 of the key cylinders attached to the door and a function of outputting a signal for driving the door lock actuators 17 and 19. And all of this information is managed by the BCM 1 by multiplex communication.

For example, when the microcomputer 9 recognizes a push button code indicating that the door button of the electronic key 5 is pressed in addition to the ID number, the microcomputer 9 first uses the multiplex communication line 16 to switch 18 of each LCU. , Get 20 states. This switch status information indicates the status of the door lock actuators 17 and 19, and is eventually a signal for knowing whether or not the door is locked. Therefore, the BCM 1 determines whether this door is in the locked state and performs control, which will be described in detail later.

FIG. 2 shows a key code signal output from the tuner 7. In this embodiment, the signal pattern is roughly divided into three parts, an A part, a B part and a B'part. ing. Therefore, the remote control signal itself emitted from the electronic key 5 is naturally a signal divided into three parts.

First, the portion A is a preamble portion, which is a signal having a waveform in which a high level "Hi" and a low level "Lo" are regularly repeated as shown in the figure.
The preamble section is a section used for distinguishing whether the signal output from the tuner 7 and input to the microcomputer 9 is noise or a remote control signal, and for stabilizing the operation of the tuner circuit.

Next, the part B is a PWM signal (pulse width modulation)
In the data portion, the data portion constitutes a command portion (command signal portion) of the remote control signal issued by the electronic key 5. The section B is composed of a data head indicating the beginning of data, a command section consisting of 8 bits (bit 7 to bit 0), and a parity bit.

Here, the details of the bits of the command part are, as shown in the figure, a waveform for distinguishing "0" and "1" by the pulse width, and for each cycle T,
When the pulse width is (1/3) T, it is "0", and (2/3)
In the case of T, it is expressed as "1". Note that reading a command from the distinction between "0" and "1" is called command signal analysis.

The subsequent B'section is a signal similar to that of the B section, and in order to determine whether or not the result of the signal analysis of the B section by the microcomputer 9 is really correct, the B'section is also subjected to the signal analysis. Whether or not the result of the signal analysis is utilized is determined based on whether or not the signal analysis results of the B part and the B ′ part match. In other words, it means that two-way matching (multiple-matching) is performed.

Here, it is not necessary that the B section and the B'section have exactly the same pattern. For example, the inverted signal of the B section may be the B'section, and the inverted double collation may be performed.

FIG. 3 shows the waveform of the output from the tuner 7 when the remote control signal is not received. First, FIG. 3 (a) shows a case where there is no noise in the frequency band received by the antenna 6, and in this case, the waveform of the preamble part from the tuner 7 is output as a continuous waveform that always maintains “Lo”. It Next, FIG. 3B shows the case where there is noise, and at this time, an irregular pulse-like waveform is output as shown in the figure.

In the present invention, the difference between the regular waveform, the continuous waveform and the irregular fine pulse-like waveform described above is detected from the difference in the pulse period and pulse width between "Hi" and "Lo", and the remote control signal is transmitted. Radio waves are discriminated based on whether they are received or whether they are remote control signals or noise.

First, the type of noise to be removed will be described. The noise shown in FIG. 3 indicates the noise output from the tuner when the remote control signal is not input, and is usually called white noise. It should be noted that this noise is exactly the same as the hum that is generated when an FM radio or the like is not receiving broadcast radio waves. Therefore, the receiving side must first distinguish this white noise from the remote control signal.

Next, as the noise, there is a sporadic high-frequency noise represented by, for example, ignition noise. This noise is generally characterized by high energy and a very narrow pulse width. In a gasoline engine of an automobile, ignition noise is generated, and therefore such noise is large. Therefore, the receiving side must remove two types of noise, white noise and sporadic high-frequency noise.

FIG. 4 shows a waveform when noise is not mixed in the key code signal when the remote control signal is input, and a waveform when noise is mixed in the key code signal. In the waveform shown as “”, the high-frequency narrow signal is mixed in here and there, and the original signal is contaminated. It should be noted that this example corresponds to the case where the above-mentioned sporadic high-frequency noise is mixed.

Generally, when restoring an input signal,
The input signal is sampled by the method based on the sampling theorem, and the input signal is restored at the sampling period.However, if the noise generation timing and the sampling timing match, correct restoration is performed. I can not do it.

Therefore, in the above-mentioned prior art,
We try to reduce the sensitivity of the receiver so that noise is not picked up, but this method is not a good idea because it makes it difficult to pick up not only noise but also normal signals.

Therefore, in this embodiment, as will be described later, after sampling at the sampling period, the input signal is confirmed again after a lapse of a time sufficiently shorter than the sampling period. Will be surely eliminated.

The operation of this embodiment will be described below. The operations described below are mainly performed by the microcomputer 9.
Is performed by. First, FIG. 5 is a flow chart showing the constant time interrupt processing 100. The constant time interrupt processing 100 is basically a processing executed at every sampling cycle set based on the sampling theorem, and is performed by the tuner 7. Preamble part of output signal
This is a process of monitoring (A section) and distinguishing whether the input signal is a remote control signal or white noise. In FIG. 5, the level "Hi" is represented by the level "H" and the level "Lo" is represented by the level "L".

In FIG. 5, the constant time interrupt processing 100
When the execution of step 1 is started, first in step 101, the level of the PI terminal to which the output signal of the tuner 7 is input is checked, and if it is "Hi", in step 103 there is a delay of a predetermined time. Given. It is necessary to set the predetermined delay time so as to match the pulse width of the high frequency noise to be removed.

Then, in step 104, the state of the PI terminal is confirmed again. Here, when the state of the PI terminal is "Lo", it means that the state has changed after the lapse of time in step 103 after recognizing once as "Hi". Indicates that the PI terminal state confirmation performed in step 101 or step 104 is meaningless. In other words, one of them has already captured the noise, and therefore, the process returns to step 101 and the state of the PI terminal is checked again.

Therefore, the process up to this point is step 10
The process is repeated until the states of the PI terminal before and after the delay time of 3 are matched in the double collation, and as a result, this process causes noise of a frequency (shorter pulse width) higher than the delay time set in step 103. Turns out to be ignored. The processes of step 102 and step 105 are similar, and the only difference is that the logic of the PI terminal is reversed.

Next, with reference to FIG. 6, what kind of signal will be specifically obtained by the processing of FIG. 5 will be described. The waveform diagram of FIG. 6 shows the difference in the recognized waveform (extracted waveform) when noise enters the input signal of the PI terminal and the sample (sampling) timing coincides with the noise generation timing. In the case where the present invention of FIG. 6 (a) is not used, noise is also determined to be a signal, the extracted waveform is destroyed, and correct waveform recognition is not performed.

On the other hand, in the case of the present invention shown in FIG. 6 (b), the correct waveform recognition is performed by the double collation in steps 101 to 105 shown in FIG. Therefore, according to the embodiment shown in FIG. 5, even if high-frequency noise enters the PI terminal, the signal is reconfirmed until the two coincide with each other, so that the correct waveform recognition can be obtained. Return to the process and continue the explanation. As I already explained,
This process is basically a process of monitoring the preamble part (A part) of the tuner output signal and distinguishing whether the input signal at that time is a remote control signal or white noise.

Then, the processing when the sample timing and the noise match is finished. In step 106, it is checked whether or not the counter CT1 is 0. If it is 0,
In step 107, the flag HIOK is cleared.

Then, in step 108, the counter CT
1 is incremented and the counter CT2 is cleared in step 109. If the counter CT1 exceeds 4 in step 110, the flag HIOK is set in step 111.

On the other hand, if it is not "Hi" at step 105, it is checked at step 112 whether the counter CT2 is 0 or not. If 0, the flag LOOK is cleared in step 113.

Then, at step 114, the counter CT
2 is incremented, and in step 115, the counter CT1 is cleared. If the counter CT2 exceeds 4 in step 116, step 117
Then, the flag LOOK is set.

At step 118, flags HIOK and L are set.
It is determined whether OOK is set together.
If it is set, the flag RCOK is determined in step 119.
Is set. That is, it is determined that the signal is a remote control signal. Then, in step 120, the constant time interrupt processing is stopped.

As described above, according to the present invention, the input signals are distinguished from each other by using the constant-time interrupt processing and judging from the pulse widths and pulse periods of "Hi" and "Lo" of the part A of the remote control signal described above. However, at this time, in the above embodiment,
When the pulse width and pulse period of "Hi" and "Lo" are regularly repeated, it is determined to be a remote control signal.

The microcomputer 9 has a pulse width measuring function for storing the rising edge of the signal input to the PI terminal and the time when the falling edge is input. Normally, the pulse width is measured using this function. Also, the pulse cycle can be accurately measured.

In the present invention, however, the reason why the method shown in FIG. 5 is used is that when a large amount of white noise is input, the processing by the pulse width measuring function is repeated many times and the microcomputer (CPU) 9 is for avoiding the problem that other processing cannot be executed.

As described above, in the embodiment of the present invention, first, the white noise and the remote control signal are separated as shown in FIG. 5, and then the remote control signal is analyzed using the pulse width measuring function of the microcomputer 9. Because I am trying to
This enables accurate remote control signal analysis even in a noisy environment.

It should be noted that the constant time interval of the constant time interrupt processing, the number of times of the counter, etc. must be adjusted so that they can be reliably distinguished in accordance with the difference in the waveform of the remote control signal and the noise, the difference in the sampling method, etc. It goes without saying that there is.

Next, the remote control signal analysis processing in the above embodiment will be described. FIG. 7 is a flowchart showing a process of recognizing a key code of a remote control signal input to the PI terminal using the pulse width measuring function built in the microcomputer 9.

This process is a process which is automatically started by RCOK = "1" set in step 119 of FIG. 5, but the starting method is omitted because it is not related to the present invention.

First, the pulse width measuring function built in the microcomputer 9 will be described. FIG. 8 is a schematic diagram of the pulse width measuring function, in which the edge detector 30 is the edge selector 3
The command 1 selects whether to catch the rising edge or the falling edge, and always observes the signal input to the PI terminal. The command to the edge selector 31 can be arbitrarily selected by software.

The latch circuit 32 receives the edge detection signal from the edge detector 30, and the current free-run timer 3
The free-run timer 33 is a 16-bit counter that keeps counting up for a fixed time (1 μs in the present embodiment) and holds $ 0.
Counting from 000 to $ FFFF,
When it exceeds, it will start counting up from $ 0000 again.

Therefore, when the edge detector 30 is instructed to capture the rising edge from the edge selector 31, the edge detector 30 monitors the rising edge of the signal input to the PI terminal, and the rising edge is detected. Is input, the operation of holding the value of the free-run timer 33 at that time in the latch circuit 32 is performed.

Next, a method of measuring the pulse width will be described with reference to FIG. FIG. 9 shows the input signal of the PI terminal and the value of the free-run timer 33. The value of the free-run timer at the first rising point A of the PI terminal is $ F0.
00, the value of the next falling point B is $ 8000, and the value of the next rising point C is $ 1000.

In this figure, since time flows from left to right, the pulse width T determined by the time when the level of the PI terminal is "Hi" is from the value at point B to the value at point A. The pulse width T ′, which is “Lo”, is the count value obtained by subtracting the value at point B from the value at point C.

Since the time required for the free-run timer to count 1 is 1 μs as described above, if the count value is multiplied by the time of 1 μs, the times of the respective pulse widths T and T'are easily obtained. be able to.

In the figure, the pulse width T is ($ 8000)-
($ F000) = $ 9000, similarly pulse width T '
Becomes ($ 1000)-($ 8000) = $ 9000.
Since this count value is a hexadecimal number, when converted to a decimal number and converted into time, a time of 36.864 ms is obtained.

Therefore, it can be easily understood that the pulse width and the pulse period can be freely measured by setting the falling edge and the rising edge of the signal at the PI terminal.

Returning to the signal analysis processing of FIG. 7, a method of receiving a remote control signal and noise removal when high frequency noise enters during reception of the remote control signal will be described as a rough flow. As described above, when it is determined by the constant-time interrupt processing of FIG. 5 that the remote control signal is input, the flag RCOK is set, and the signal analysis processing of FIG. 7 starts.

First, when it is determined in step 201 that the signal analysis has been completed, the process jumps to step 206 to stop the command signal analysis processing by itself, and in step 207, the fixed-time interrupt processing is started and this processing ends. . That is, it returns to the state of waiting for the remote control signal.

When the signal analysis is not completed, it is judged in step 202 whether the analysis of the A part (preamble part) is completed, and if it is not completed, the A analysis is executed in step 300.
Partial analysis continues. This step 3
The analysis of the A section of 00 is to reconfirm whether the remote control signal discrimination performed in FIG. 5 is really correct.

If the detection of the part A is completed, it is checked in step 203 whether the analysis of the part B (data part) is completed. If it is not completed, the analysis of the part B is continuously executed in step 400. To be done. The key code analysis is actually performed in step 400.

At step 204, the abnormality such as the difference in the pulse width of the waveform, the pulse period, the pattern, etc. and the time over of the data frame is checked, and if there is an abnormality, the analyzed command is erased at step 205. It

Subsequently, in step 206, the command signal analysis processing of its own is stopped, and in step 207, the constant time interrupt processing is started and ended.

Next, the preamble analysis processing shown in step 300 will be described with reference to the flowchart of FIG. As described above, this process is a process of analyzing the A part of the remote control signal. The A part is a regular square wave with a duty of 50% as shown in FIG. Then, this signal is a certain predetermined time (TM1)
Only when they are consecutive, the remote control signal is judged to be the head.

When the processing of FIG. 10 is entered, first, step 30
At 1, the timer TMR is cleared. This timer is
The timer is counted up by a constant-time process other than the constant-time interrupt process of, and ultimately measures the edge interval of the signal input to the PI terminal.

Since the signal analysis process of FIG. 7 is a process which is started only when there is an input signal, if there is no signal during the process, the process will not proceed while staying in that step. The process starts from the stopped step. Therefore, the timer TMR is used to detect that the signal is no longer input to the PI terminal, that is, the remote control signal has stopped, to interrupt the signal analysis process and return the process to the initial state. .

By this processing, even if the remote control signal is interrupted after the signal analysis of the remote control signal is started, an abnormality is noticed, and it is possible to start over immediately from the beginning. It can be carried out.

At step 302, it is judged whether the input edge is a rising edge or a falling edge,
If it is a rising edge, a predetermined time is waited in step 303, and then the input signal level of the PI terminal is confirmed in step 304.

Here, when the signal level is "Lo", that is, when the rising edge of the input signal of the PI input terminal is captured but the signal is not rising, the captured signal is high frequency noise. Since it can be determined that there is, step 30 is performed to interrupt the processing and prepare for a new input signal.
End 0.

Similarly, if it is determined in step 302 that the edge is a falling edge, a delay time is given in step 305, and the input signal level is confirmed in step 306. If the signal level is "Hi" despite the existence, it is determined to be high frequency noise and step 300 is ended.

Next, the processing up to this point will be described with reference to FIG. FIG. 11 is a signal waveform diagram in the case where high frequency noise (such as automobile ignition noise) is added to the remote control signal input to the PI terminal, its enlarged view, and how the processing in each step functions. In general, high-frequency noise is pulse-shaped narrow-width noise, so noise is removed by using this characteristic.In the figure, during analysis of the preamble signal, It is assumed that, after detecting the rising edge of the remote control signal, noise is input while trying to measure the pulse width by detecting the next falling edge.

The falling portion of the signal is input to the PI terminal,
When the signal analysis processing shown in FIG. 7 is started, step 3
00 preamble analysis processing is executed. First, since it is a falling edge, a delay is made in step 305, and a predetermined time is waited. It should be noted that this predetermined time is data that should be varied depending on the pulse width of the noise to be removed, so it cannot be generally called what kind of time. Then, in step 306, the level of the PI terminal is checked.

Then, since the start condition of step 300, that is, the falling edge is caught, the signal must be "Lo", but if it is "Hi", in step 305. It can be determined that a pulse that is shorter than the delay time is input.

Since the signal pattern of the remote control signal input to the PI terminal is naturally known on the receiving device side, such a short signal can be easily judged to be an abnormal signal (noise). Therefore, even if high-frequency noise is input a plurality of times, it can be determined that it is noise. In addition,
If there is noise near the edge of the correct remote control signal, this noise may be judged to be a normal signal, but the error due to this is the delay time, so it is a short time that does not pose a problem.

For example, in the case of this embodiment, the pulse width of the regular remote controller is about 2 ms, and the time (delay time) of the noise to be removed is about 10 μs. According to this embodiment, the high-frequency noise can be completely separated by the above-described processing, so that it is possible to provide a signal analysis method that is resistant to the noise environment.

Returning to FIG. 10, the description will be continued. First, when the rising edge is first detected, TP2 is measured in step 307 through step 303 to step 304. Here, if it is the first edge, there is no data in the time SVFRCT when the rising edge was input last time, and the value of TP2 is a random value, so the result in step 308 is NO, Step 3
10 is executed and TP2OK = “0”. The TP2OK is a flag for determining whether or not the pulse period TP2 is regular.

Then, in step 311, the edge selector 31 shown in FIG. 8 is switched to the state of selecting the falling edge, and in the following step 312, the rising edge time is set to S.
Store in VFRCT. As a result, the SVFRCT data comes at the time when the rising edge of the signal input to the PI terminal is input.

At step 318, TP1OK, TP2
It is determined whether or not both OK are "1", but since NO at this time, TM1 is cleared in step 320. This TM1 is a timer that is activated when both TP1OK and TP2OK become "1".
It is counted up in the same manner as the TMR of 01, and is used to determine the completion of preamble detection for the first time when the preamble is detected continuously for a certain period of time. It is also used to define the time until the key code analysis process, which is the process of (1), is started.

Therefore, in this embodiment, in order to more surely recognize the remote control signal, the timer (TMR) for detecting the interruption of the remote control signal and the timer for defining the time limit from the detection of the preamble signal to the start of the key code analysis. (T
M1) and a timer (TM2) that defines the time limit from the start of key code analysis to the end of analysis are used.

Although not described in this embodiment,
When the TM1 timer exceeds the specified time, the sign of the preamble part analysis completion in step 202 of FIG. 7 is given, which triggers the process to proceed to the next step 203, or the abnormality is detected, and the signal analysis process is initialized. The input of the next remote control signal can be dealt with in a short time.

Since the data is stored in SVFRCT in this way, the reference time is determined and the PI terminal is set so as to catch the next falling edge. I will wait.

When the falling edge is input, this time, through steps 302 to 305 and 306, and in step 313, TP1 is measured. Here, ICR is the value of the free-run timer captured by the latch circuit 12 in FIG. 8. Therefore, from ICR to SVFRC.
It can be understood that by subtracting T, the time required from the rising edge to the falling edge is obtained, and this is the pulse width of the "Hi" time of the signal input to the PI terminal. On the other hand,
It can be easily understood that TP2 described above is the time from the rising edge to the rising edge, that is, the pulse cycle data.

Further, TP1L, TP1H and TP2
L and TP2H are the limit values of the tolerance range used to judge that they are the normal signals of TP1 and TP2, respectively.
If TP1 and TP2 are within this tolerance range, flag T
It can also be understood that when P1OK and TP2OK are set and are out of the tolerance range, they are cleared.

Next, FIG. 12 shows the relationship between each data and the limit value. In FIG. 12, TP1 is a pulse width, and TP
2 is a pulse period, TP1H, TP1L, and TP2
H and TP2L represent the tolerance range. The difference between points B and A of the free-run timer is TP1 and C and A, respectively.
It can be seen that the difference between the points becomes TP2, and the measurement is repeated in the following order. Therefore, according to the embodiment of FIG.
It can be understood that it is robust against noise environment and the analysis and detection of the preamble part can be surely obtained.

Next, the key code analysis process in step 400 of FIG. 7 will be described with reference to FIG. First, in step 401, the timer TMR and the timer TM1 are cleared,
Then, the activation determination process of the timer TM2 is executed. This timer TMR is the same as the one executed in step 301 of FIG. 10 and is used for the same purpose, so the description thereof will be omitted. Next, step 402 is a process for removing high-frequency noise, which is also the same as the contents described with reference to FIGS.

Next, in step 403, the input edge is confirmed and it is determined whether it is a rising edge or a falling edge. Then, in the case of the falling edge, the pulse width is measured as described with reference to FIG. 10. In the case of this key code analysis processing, as described with reference to FIG.
Depending on the size of the pulse width, a process for distinguishing between data "0" and data "1" is added.

From step 407 to step 411, the data "0" and "1" are recognized depending on which area the position of the falling edge is in. If it is not in either area, immediately. Processing is ending.
This means that signals outside the judgment area range are ignored, and conversely, any data in the judgment area will be recognized as data.

As a result, if a signal having a signal pattern similar to the original remote control signal is input, this signal may be recognized as correct data, which may occur. In the example, this problem is dealt with by repeatedly inputting the data part a plurality of times. In other words, the frames of the captured data section are subjected to multiple collation to determine whether or not the frame is genuine (B section and B'section in FIG. 2).

As is clear from the above description of the embodiments,
In the present invention, a signal similar to the remote control signal is also positively taken in, thereby eliminating missing of a signal due to a particular decrease in reception sensitivity, and reliability of data is improved by collating the taken-in data multiple times. This is ensured so that a receiving device resistant to noise can be obtained.

If the rising edge is determined in step 403, it is determined in steps 404 to 406 whether the rising position is normal. If it is determined to be normal, the flag TD3OK = "1", and if it is determined to be abnormal, TD3OK = "0".

At step 412, the flag TD3OK is set.
Then, the result of pulse width confirmation is checked, and if the result is confirmed to be abnormal, the initialization processing is executed in step 418, and the signal analysis processing of FIG. 7 is restarted from the beginning.

If it is judged as normal in step 412,
In step 413, the certification data is stored, and in step 414, the timer TM1 is cleared and the timer TM2 is activated. The timer TM1 is a timer that is activated in step 319 of FIG. 10, and is a timer that defines the duration of the preamble and the time until the key code recognition is started. Therefore, the recognition process is started. Also, it will be cleared at this timing.

Next, the timer TM2 is a timer which is activated only once when this key code analysis processing is started.
It is a timer that defines the time limit from the start of key code analysis to the completion of key code extraction.This timer is also counted up by a constant time process other than the constant time interrupt process, which prolongs the key code detection, It detects abnormalities when the signal is interrupted, and can immediately start over from the beginning.

As described above, in the above embodiments, the timer for limiting the time for executing the processing is incorporated everywhere,
As a result, it is possible to perform signal analysis with no dead time even when there is an abnormality.

Next, in step 415, it is judged whether or not all the data has been taken in. If yes, the data is collated in step 416. In this step 416, it is judged by multiple collation whether or not the data parts fetched a plurality of times are the same data. If the result of this determination is OK, the key code is extracted in step 418, and this becomes the basis of the signal for operating the motor 9. On the other hand, if NO, step 4
It is initialized at 19 and starts over.

FIG. 14 shows the relationship between the recognition pulse width TD1 of the data "0" in the PI terminal input signal, the recognition pulse width TD2 of the data "1", the data value TD3 of the pulse period, and their tolerances. Here, the solid line indicates the case where the data “0” is input, and the broken line portion indicates the position when the data “1” is input. Note that the contents of FIG. 14 are basically the same as those of FIG.

Therefore, according to the above embodiment, the noise and the signal can be separated without lowering the receiving sensitivity, so that the remote control signal can be reliably captured and the performance which is not changed even in the place where the noise environment is bad. It is possible to reliably provide a control data transmission device for a remote control device that can be exhibited.

When the ID number is detected by the above processing, the microcomputer 9 next executes the BGJ (background job) shown in FIG. 15 to start the control. Note that BGJ is a process that is normally executed when the microcomputer 9 does not have a process such as a signal analysis process that should be preferentially executed, and is thus called.

When entering the processing of this BJM100, first,
In step 101, it is checked whether the signal analysis processing of the electronic key 5 is completed, and if it is completed, the ID number is loaded from the EEPROM 8 in step 102. Subsequently, in step 103, the collation of both data is executed. Here, if the ID numbers match, it is determined that the operation is performed by the official key of the vehicle, and first, in step 104, it is confirmed whether or not the activation permission signal has already been transmitted to the engine control device 4. Then, if it has not been transmitted yet, in step 300, the transmission processing of the activation permission signal is executed.

After that, it is checked whether the push button code is received. If there is the button code, the multiplex communication process using the communication IC 10 is started in step 106. Then, the door lock control 400 for controlling the door lock / unlock is executed.

FIG. 16 shows the multiplex communication process 200 started in step 106. This process is such that steps 201 to 204 are repeatedly executed every time it is started, and eventually the LCU2 and LCU3 are executed. This is a process of cyclically transmitting and receiving.

First, in step 201, the state data of the door lock detection switch obtained by the LCU 2 is obtained.
That is, from the LCU2 to the communication IC 10 of the BCM1,
The information obtained by LCU2 is sent. In step 202, the information to be output from the communication IC 10 to the LCU 2 is transmitted in reverse. Here, this data corresponds to a signal for operating the door lock actuator 17. Then, in steps 203 and 204, data exchange is similarly performed with respect to the LCU 3 and is repeated.

Next, FIG. 17 shows the process of transmitting the activation permission signal to the engine control device in step 300. First, in step 301, the activation permission signal (key code) to be transmitted is loaded from the EEPROM 8. Then, in step 302, the voltage level of the C0 terminal (microcomputer 9) is checked, and it is confirmed that the communication line 15 is not used. If not, in step 303, it is determined whether the key code has already been transmitted. Is confirmed, and if not, in step 304, the key code is transmitted.

FIG. 18 is a door lock control processing flow of the processing 400. Each LC obtained by the communication IC 10
Since the information of U is stored in the memory built in the microcomputer 9, first in step 401, the information is obtained, and the door lock state of the driver's door and the door lock state of the passenger's door are confirmed. .

In step 402, it is checked whether or not both doors are in the locked state. If all the doors are in the locked state, in step 404, a signal for unlocking all the door lock actuators is set. If any of them is unlocked, in step 403, a signal for locking the all-door lock actuator is set.

The signals set here are sent to the respective LCs via the communication IC 10 by the multiplex communication processing of FIG.
Sent to U to operate the target actuator,
The desired control will be achieved. The above is BC
This is the content of the processing executed by M1.

Next, the operation of the engine control device 4 will be described. First, the communication processing between the BCM 1 and the engine control device 4 will be described with reference to FIG.
2 is the same as the processing described with reference to FIGS. 2 to 6, which is the reception processing 500 of the activation permission signal using the sampling theorem based on the constant time, and is the interrupt processing activated at regular time intervals. However, by confirming the voltage level of the C1 terminal, the waveform of the input activation permission signal is recognized.

Therefore, according to this embodiment, as described above, the noise and the signal can be distinguished from each other without setting the sampling frequency higher than necessary, so that the analysis of the signal not disturbed by the noise can be performed. It is possible. First, in step 501, the level of the C1 terminal is checked. After this, step 502 or step 504
, There is a longer time delay than the frequency component of the noise that would be input, then step 503,
Alternatively, in step 505, the level of the C1 terminal is confirmed again.

As a result, if it matches the level checked in step 501, it is determined that it is not noise, and the downstream processing is executed. If the checked levels do not match, it is determined that it is noise and the step is performed. Returning to 501, the collation is repeated until they match. By doing so, noise can be detected even when the noise component is continuous or in the case of a single shot, and as described above, the noise can be removed without increasing the sampling frequency more than necessary. .

First, when "H" is confirmed in step 503, that is, when it is recognized as a normal signal, the pulse cycle of the input signal (pulse cycle of the activation permission signal) is calculated in step 507. This can be easily obtained by adding the number of times "H" is recognized and the number of times "L" is recognized. This is because this counter accurately counts at fixed time intervals, which is the same as multiplying the count value by the fixed time.

In step 507, it is checked whether the calculated pulse period corresponds to normal data. Then, if it is abnormal, the processing is interrupted and ended, but if it is normal, the data of the HI counter is checked in step 509. Here, as described with reference to FIG. 2, when the pulse period (T) is in the vicinity of 2T / 3, the reception data is determined to be “1”, and when it is in the vicinity of T / 3, the reception data is determined. Is determined to be "0", and the received data per pulse is stored in steps 511 and 512, respectively.

In step 513, the HI counter is counted up, and in step 514, it is determined whether or not all data has been stored. When it is determined that the storage is completed, the ID number and the button code are set and stored in step 515. On the other hand, step 505
When it is determined that the C1 terminal is "L" in step 5,
At 06, the LO counter is counted up, the time during which the input signal is "L" is measured, and the processing is ended.

By the way, the activation permission signal reception process shown in FIG. 19 is a process by the sampling method by the constant time as described above, but the time between the falling edge and the rising edge of the input signal is measured. The same purpose can be achieved by the method, and the processing contents are shown in FIG.

The start permission signal reception process 6 shown in FIG.
00 is the same as the noise processing described in FIGS. 7 to 14,
This is an interrupt process started by detecting the rising edge and the falling edge of the signal input to the C1 terminal. First, in step 601, steps 501 to 50 in FIG.
The same processing as the processing up to 5 is performed to distinguish between noise and signal.

Subsequently, it is checked whether the signal captured in step 602 is a rising edge or a falling edge. If the signal is a falling edge, in step 603 the time from the rising edge is measured. In step 603, first, the pulse period (T)
If the pulse width is near T / 3 for
At 04, "0" data is certified. Then T / 3
If it is not near 2T / 3, it is checked in step 605 if it is near 2T / 3, and if it is near 2T / 3, "1" data is certified in step 606.

On the other hand, if it is determined in step 602 that the rising edge has occurred, the time between rising edges is calculated in step 607 to obtain the pulse period. If the pulse cycle is within the normal range, the recognition data is stored in step 608. If it is not within the normal range, step 60 is performed.
At 9, the certification data is erased and initialized.

After step 608, step 610 is performed.
Then, it is judged whether or not the storage of all the data is completed, and if the storage of all the data is completed, step 611.
The ID number and the button code are stored in.

As described above, in this embodiment, the input signal is rechecked and collated at a time larger than the frequency of the noise that will be input, so that the signal that is not affected by the noise is detected. Analysis can be performed.

Next, FIG. 21 shows a function stop determination process 700.
Then, this is a processing routine for determining whether to activate or stop the function of the engine control device 4 based on the activation permission signal obtained by the processing of FIG. 19 or 20.

First, in step 701, it is judged whether or not a start permission signal is input, and if there is input, step 702.
Then, the key code is loaded from the EEPROM 11 and the two are compared in step 703. In step 704,
According to the comparison result, if they match, in step 705,
The function of the engine control device 4 is activated, and if they do not match, a function stop is set in step 706.

Therefore, according to this embodiment, BCM1,
Alternatively, when the engine control device 4 is replaced or when the vehicle is forcibly driven without using the electronic key, the engine cannot be started, so that the vehicle can be prevented from being stolen.

[0127]

According to the present invention, since the remote control signal can be reliably identified without being affected by noise, it can be applied to a keyless entry system of a vehicle such as an automobile and easily have high reliability. You can

Further, according to the present invention, since the processing load of the keyless entry microcomputer can be reduced, it can be shared with a microcomputer used for other processing such as multiplex communication processing and the configuration can be simplified. You can

[Brief description of drawings]

FIG. 1 is a configuration diagram of a vehicle keyless entry system to which an embodiment of a control data transmission device according to the present invention is applied.

FIG. 2 is a waveform diagram of a remote control signal in the present invention.

FIG. 3 is an explanatory diagram of a noise waveform included in a remote control signal.

FIG. 4 is a waveform diagram of a remote control signal showing the operating principle of the present invention.

FIG. 5 is a flowchart showing a constant time interrupt process according to an embodiment of the present invention.

FIG. 6 is a timing chart for explaining the operation according to the embodiment of the present invention.

FIG. 7 is a flowchart showing a signal analysis process according to an embodiment of the present invention.

FIG. 8 is an internal configuration diagram of a system according to an embodiment of the present invention.

FIG. 9 is a timing chart for explaining the operation according to the embodiment of the present invention.

FIG. 10 is a flowchart showing a preamble analysis process according to an embodiment of the present invention.

FIG. 11 is a timing chart for explaining the operation according to the embodiment of the present invention.

FIG. 12 is a timing chart for explaining the operation according to the embodiment of the present invention.

FIG. 13 is a flowchart showing a key code analysis process according to an embodiment of the present invention.

FIG. 14 is a timing chart for explaining the operation according to the embodiment of the present invention.

FIG. 15 is a flowchart showing a background job according to an embodiment of the present invention.

FIG. 16 is a flowchart showing a multiplex communication process in an example of the present invention.

FIG. 17 is a flowchart showing a start permission signal transmission process according to an embodiment of the present invention.

FIG. 18 is a flowchart showing a door lock control process in the embodiment of the present invention.

FIG. 19 is a flow chart showing a start permission signal receiving process (sampling method) according to an embodiment of the present invention.

FIG. 20 is a flowchart showing a start permission signal reception process (edge detection method) according to an embodiment of the present invention.

FIG. 21 is a flowchart showing a function stop determination process according to an embodiment of the present invention.

[Explanation of symbols]

1 BCM (body control module) 2, 3 LCU (local control unit) 4 engine control unit 5 electronic key 6 antenna 7 tuner 8 and 11 EEPROM (electrically erasable and programmable read only memory) ) 9, 12 Microcomputer (microcomputer) 10 Communication IC 13 I / O (input / output circuit) 17, 19 Door lock actuator 18, 20 Switch (for door lock detection)

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Tatsuya Yoshida 2520 Takaba, Hitachinaka City, Ibaraki Prefecture Hitachi Ltd. Automotive Equipment Division

Claims (10)

[Claims] 1. A control data transmission device, wherein the validity of a received signal is judged by a predetermined additional signal added to the beginning of the signal, and the received signal is sampled at regular intervals. By providing a determination means for detecting the presence of the additional signal by doing, and a data recognition means for recognizing the control data by measuring the pulse width of the received signal, when the determination result by the determination means is affirmative A control data transmitting apparatus, characterized in that the control data recognizing process is started by the data recognizing means. 2. The control data transmission device according to claim 1, wherein the pulse width measurement process by the data recognition means is a signal level duration measurement process. 3. The control according to claim 1, wherein the pulse width measuring process by the data recognizing means is a measuring process of a detection time interval of a rising edge and a falling edge of a signal. Data transmission equipment. 4. The positive / negative level of the signal according to claim 3, wherein at least one of a time point when the edge of the signal is detected by the data recognition means and a time point after a predetermined time has passed from the time point. A level determining means for confirming is provided, and the positive / negative state of the confirmed level and the edge state at the time of detecting the edge are a rising edge with respect to the positive level or a falling edge with respect to the negative level. When not present, the control data transmission device is characterized in that the pulse width measuring process by the data recognizing means is executed by ignoring the signal of the edge. 5. The data recognizing means according to claim 2, wherein the processing of measuring the signal level duration by the data recognizing means is executed by a level sampling processing based on a sampling theorem. Includes a means for confirming the level of the signal again after a time sufficiently shorter than the sample timing after sampling the signal at the sample timing, and when the signal level states do not match, it matches The control data transmitting apparatus is characterized in that the processing by means for confirming the level is repeated at a time interval sufficiently shorter than the sample timing. 6. A control data transmission device, wherein the validity of a received signal is judged by a predetermined additional signal added to the beginning of the signal, and the received signal is sampled at regular intervals. Determination means for detecting the presence of the additional signal by doing, data recognition means for recognizing the control data by measuring the pulse width of the received signal, and start when the determination result of the determination means is affirmative When the determination result by the determination means is affirmative, the control data recognition process by the data recognition means is started, and when the measured time by the timing means reaches a predetermined value, the data When the recognition of the control data has not been obtained by the recognizing means, the processing by the data recognizing means is interrupted and the additional signal of the judging means is judged. Control data transmission apparatus characterized by being configured to return to the output processing. 7. A control data transmission device adapted to judge the legitimacy of a received signal by a predetermined additional signal added to the beginning of the signal, sampling the received signal at regular intervals. Determination means for detecting the presence of the additional signal by doing, data recognition means for recognizing the control data by measuring the pulse width of the received signal, and start when the determination result of the determination means is affirmative When the determination result by the determination means is affirmative, the control data recognition process by the data recognition means is started, and when the measured time by the timing means reaches a predetermined value, the data When the recognition processing of the control data by the recognition means is not started, the processing by the data recognition means is interrupted and the addition by the determination means is performed. Control data transmission apparatus characterized by being configured to return to the detection processing of the item. 8. A control data transmission device adapted to judge the legitimacy of a received signal by a predetermined additional signal added to the head of the signal, wherein the received signal is sampled at regular intervals. Determining means for detecting the presence of the additional signal by doing so, data recognizing means for recognizing the control data by measuring the pulse width of the received signal, and starting when the data recognizing process by the data recognizing means is started. When the determination result by the determination means is affirmative, the control data recognition process by the data recognition means is started, and when the measured time by the timing means reaches a predetermined value, the data When the recognition processing of the control data by the recognition means is not completed, the processing by the data recognition means is temporarily stopped and the data from the beginning is deleted. Control data transmission apparatus characterized by being configured to return the recognition process. 9. A control data transmission device adapted to judge the legitimacy of a received signal by a predetermined additional signal added to the head of the signal, wherein the received signal is sampled at regular intervals. Determination means for detecting the presence of the additional signal by doing, the data recognition means for recognizing the control data by measuring the pulse width by detecting the rising edge and the falling edge of the pulse of the received signal, A time measuring means for measuring the time interval from the rising edge to the falling edge of the pulse of the received signal is provided, and when the determination result by the determining means is affirmative, the control data recognition processing by the data recognizing means is performed. When the time measured by the time measuring means reaches a predetermined value, the processing by the data recognizing means is temporarily stopped and the data recognizing process from the beginning is started. Control data transmission apparatus characterized by being configured to return to. 10. Control data configured to cause a receiving device to perform a predetermined operation when a plurality of signals transmitted from a transmitter and determined to be the same data match a preset key code. In the transmission device, the input signal is input multiple times positively as a signal that approximates the signal pattern (cycle, pulse width pattern) of the key code that is known in advance, and the input signal is input at least once. A control data transmission device comprising: a means for determining that the acquisition is normal when the above collation is performed, and a means for collating with the key code for the first time when the determination result is affirmative.