JPH0540629Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a remote control device for a vehicle load using a wireless transmitter.

(Prior Art) In recent years, for example, in automobiles, door lock mechanisms have been constructed so that unlocking and locking operations can be performed not only with a normal key but also with a wireless transmitter carried by the driver. It is provided. In such a configuration, the wireless transmitter is provided with an unlocking operation switch and a locking operation switch, and when these operation switches are operated, an unlocking command signal or a locking control signal is sent as a control signal. A transmission circuit is provided for transmitting a command signal using an air propagation medium (electromagnetic waves, infrared rays, ultrasonic waves, etc.). Further, the door lock mechanism side (that is, the vehicle body side) is provided with electromagnetic solenoids for unlocking and locking the door lock mechanism, and a receiving device for receiving the unlock command signal and lock command signal. When receiving an unlocking command signal, this receiving device energizes the unlocking electromagnetic solenoid to unlock the door lock mechanism, and also energizes the locking electromagnetic solenoid when receiving a locking command signal. and is configured to lock the door lock mechanism. In order to put such a configuration into practical use, it is of course necessary to identify the vehicle from other vehicles, so it is necessary to The wireless transmitting device includes a unique verification code, and the receiving device has a function of identifying the verification code.

In the case of the above-mentioned wireless transmitting devices, it is necessary to make the verification codes included in the unlocking command signal and locking command signal different for each device, and therefore, in order to increase its productivity and practicality, Therefore, there is a need for a configuration that can easily change the verification code without changing the hardware. FIG. 5 shows an example of a wireless transmitting device employing the above configuration.

That is, in this Fig. 5, 1 is battery,
The output of this is transistor 3 for power line 2.
selectively given through. Numeral 4 is an unlocking operation switch, and 5 is an unlocking operation switch, which are configured in a momentary type that turns on only when an operating force is applied. The above operation switches 4 and 5
In each case that the transistor 3 is turned on, the base current of the transistor 3 flows through the resistor 6 and the diode 7 or the resistor 6 and the diode 8, so that the transistor 3 is turned on and the power supply line 2 is connected to the battery 1. Connected. Reference numeral 9 denotes a microcomputer that is supplied with power from the power supply line 2, and its input ports Pa and Pb receive ON signals Sa and Sb (low level) when the unlocking operation switch 4 and the locking operation switch 5 are turned on. signal)
are provided via diodes 10 and 11, respectively. Further, 12 ₁ to 12 _o are n code set switches connected to input ports P ₁ to _{P o} of the microcomputer 9, and verification codes corresponding to combinations of these ON states are sent to the microcomputer 9.
It is now set to . Here, when the microcomputer 9 receives the on signal Sa in response to the turning on of the unlocking operation switch 4,
The unlock command signal Su including the verification code set as above is output from the output port O ₁ , and the on signal Sb is output in response to the lock operation switch 5 being turned on.
When inputted, a locking command signal So including the verification code is outputted from the output port _O1 . Further, 13 is a modulation circuit that modulates the unlock command signal Su and the lock command signal So output from the microcomputer 9, and 14 is a modulation circuit that carries the modulation signal from the modulation circuit 13 on a carrier wave and transmits it by electromagnetic waves from an antenna 14a, for example. These modulation circuits 13 and transmission circuits 1
4 is adapted to be supplied with power from the power supply line 2. Note that the transmitting circuit 14 includes a crystal oscillator 14b for carrier waves.

(Problem to be Solved by the Invention) According to the wireless transmitter configured as described above, the verification code included in the unlocking command signal Su and the locking command signal So can be changed by the code setting switch 1.
This can be easily achieved by changing the combination of on-states of 2 ₁ to 12 _o . Moreover, in this case, there is no need to use different hardware for each device, and thus the intended purpose of increasing productivity and practicality can be achieved. However, in the above conventional configuration, many other code setting switches 1 of the relatively expensive microcomputer 9
2 ₁ to 12 _o , etc., which not only increases manufacturing costs but also leads to an increase in overall size and weight.

The present invention was developed in view of the above circumstances, and its purpose is to reduce the manufacturing cost of a wireless transmitter for transmitting control signals, and to reduce the size and weight of the wireless transmitter. An object of the present invention is to provide a remote control device for a load for a vehicle that achieves the following effects.

[Structure of the invention] (Means for solving the problem) The present invention provides a wireless transmitter that has a plurality of types of operation switches and transmits different control signals each time the operation switches are operated; The object of the present invention is a remote control device for a vehicle load, which is equipped with a receiving device that operates a vehicle load corresponding to the control signal when the control signal is received, and in such a device, the above wireless transmitter and Each receiving device is configured as follows.

That is, the wireless transmitting device stores header signals read out sequentially by a pulsed clock signal and a verification code unique to the device, and the output time width of each header signal and verification code depends on the length of the cycle of the clock signal. a programmable ROM configured to change the length of the clock in accordance with the operation of the operating switch; an oscillation circuit configured to generate the clock signal when operated in response to the operation of the operating switch and supplying the clock signal to the programmable ROM; a circuit of the oscillation circuit; an adjustment circuit that changes the period of the clock signal output from the oscillation circuit into multiple stages by changing a constant for each type of operating switch operated; The control device includes a transmitting circuit that transmits the header signal and verification code obtained as the control signal.

Further, the receiving device determines the operated operation switch based on the time width of the header signal included in the control signal, and also determines the suitability of the control signal based on the verification code also included in the control signal. It consists of a means for determining.

(Function) When any of the multiple operation switches is operated on the wireless transmitter side, the oscillation circuit is activated and a pulsed clock signal is generated, and this clock signal causes the programmable ROM to be programmed. The stored header signals and verification codes are sequentially read out and output from the programmable ROM. In this case, the output time widths of the header signal and the verification code vary depending on the cycle of the clock signal (that is, the reading speed depending on the cycle). and,
The header signal and verification code thus read out are transmitted from the transmission circuit as control signals. At this time, the period of the clock signal output from the oscillation circuit, in other words, the programmable ROM
The reading speed of the header signal and verification code from the oscillator will be changed in multiple stages as the circuit constants of the oscillation circuit are changed according to the type of operating switch operated, so The time width of the header signal included in the signal is unique to the type of operation switch operated. On the other hand, when the control signal is transmitted as described above, the determining means in the receiving device that receives it determines the type of operation switch operated based on the time width of the header signal included in the control signal. At the same time, the appropriateness of the control signal is also determined based on the verification code included in the control signal. In this case, the verification code included in the control signal can be easily changed by rewriting the memory contents of the programmable ROM, so there is no need to make any changes to the hardware on the wireless transmitter side. .

(Embodiment) Hereinafter, an embodiment in which the present invention is applied to a remote control device for a door lock mechanism for an automobile will be described with reference to FIGS. 1 to 4.

FIG. 1 shows a schematic circuit configuration of a wireless transmitter 21 carried by a car driver. In FIG. 1, 22 is a battery, and its positive terminal is connected to the power supply line 22a by a pnp transistor 23.
The negative terminal is connected to the ground terminal. 24 is an unlocking operation switch, one end of which is connected to transistor 2.
3, and the other end is connected to the ground terminal via a resistor 25. 2
Reference numeral 6 denotes a lock operation switch, one end of which is connected to the base of the transistor 23, and the other end connected to the ground terminal via a resistor 27. Therefore, when the operation switches 24 and 26 are turned on, the transistor 23 is turned on and the power supply line 22a is connected to the battery 22. The operating switches 24 and 26 are momentary switches that turn on only when an operating force is applied.

28 is an oscillation circuit supplied with power from the power supply line 22a, which has a well-known configuration using an operational amplifier 29 and a capacitor 30 for a time constant;
1 to 34 are connected between the power supply line 22a and the ground terminal as shown in the figure. and,
The oscillation circuit 28 is operated when the power is supplied, that is, when the unlocking operation switch 24 or the locking operation switch 26 is turned on, and generates a rectangular pulse-shaped addressing signal. Outputs clock signal Sc. 35 is an oscillation circuit 28
This is an adjustment circuit for changing the oscillation frequency of the oscillation circuit, which connects the common connection point of the resistors 33 and 34 in the oscillation circuit 28 (the non-inverting input terminal (+) of the operational amplifier 29),
It is constructed by connecting the lock operation switch 26 and a common connection point with the resistor 27 with a resistor 36. Therefore, the circuit constant of the oscillation circuit 28 changes depending on whether the unlocking operation switch 24 is operated or the locking operation switch 26 is operated. As a result, when the lock operation switch 26 is turned on, the input voltage of the non-inverting input terminal (+) of the operational amplifier 29 is applied to the power supply battery through the resistor 36, the lock operation switch 26, and the emitter-base of the transistor 23. 21, the charging/discharging cycle of the capacitor 30 becomes longer and the oscillation frequency of the oscillation circuit 28 becomes lower (the output cycle of the clock signal Sc becomes longer). Furthermore, when the unlocking operation switch 24 is turned on, the input voltage of the non-inverting input terminal (+) of the operational amplifier 29 is raised as described above, and the charging/discharging cycle of the capacitor 29 is not lengthened. The oscillation frequency from the circuit 28 becomes higher than when the unlocking operation switch 26 is turned on (the output cycle of the clock signal Sc becomes shorter).

37 is a programmable ROM supplied with power from the power line 22a, in which a predetermined header signal HS and a verification code ID unique to the wireless transmitter 21 are stored in advance, and the stored contents are sequentially read by the clock signal Sc. It is starting to be read out. In this case, the reading speed of the header signal HS and verification code ID becomes slower as the period of the clock signal Sc becomes longer, and the output time width of the header signal HS and verification code ID also increases accordingly. be. The enable terminal E of the programmable ROM 37 is connected to a well-known power-on reset circuit 38, which is formed by connecting a capacitor 38a and a resistor 38b in series between the power supply line 22a and the ground terminal, so that the voltage on the power supply line 22a is established. It is switched to the operational state for the first time. 39 is the above programmable
A modulation circuit modulates the header signal HS and verification code ID read from the ROM 37, and 40 is a transmitting circuit that outputs the header signal HS and verification code ID modulated by the modulation circuit 39 as a control signal OS. The control signal OS is transmitted by electromagnetic waves from the antenna 40a, for example, on a carrier wave. Note that the modulation circuit 39 and the transmission circuit 4
0 is configured to be supplied with power from the power supply line 22a. The transmitting circuit 40 also includes a crystal oscillator 40b for carrier waves.

In short, in the wireless transmitting device 21 configured as described above, in each state where the unlocking operation switch 24 and the locking operation switch 26 are turned on, the oscillation circuit 28 , programmable ROM 37, modulation circuit 3
9 and a transmitting circuit 40, and in response, a control signal OS carried on a carrier wave is transmitted from the transmitting circuit 40 via an antenna 40a. In this case, the time width T of the header signal HS included in the control signal OS is
The output period is determined by the output period of the clock signal Sc from the locking device 8, and the output period is determined by which of the unlocking operation switch 24 and the locking operation switch 26 is turned on. Therefore, as shown in FIG. 2, when the locking operation switch 26 is turned on, the output cycle of the clock signal Sc from the oscillator 28 becomes longer than when the unlocking operation switch 24 is turned on. The above-mentioned time width T is relatively long, and depending on the length of the time width T, the unlocking operation switch 24 and the locking operation switch 2
6 is turned on.

Now, FIG. 3 shows a circuit configuration of a receiving device 41 provided on the body side of an automobile and parts related thereto, which will be explained below. That is, 42a to 42d are electromagnetic solenoids for unlocking which are vehicle loads, and 42e to 42h are electromagnetic solenoids for locking which are also vehicle loads, and these are part of a total of four door lock mechanisms provided in the automobile door. It constitutes. In this case, the door lock mechanism is configured to be unlocked when the unlocking electromagnetic solenoids 42a to 42d are energized, and to be locked when the locking electromagnetic solenoids 42e to 42h are energized. ing. On the other hand, the receiving device 41 includes an amplification detection circuit 43, a waveform shaping circuit 44, a microcomputer 45, code setting switches ₄₆₁ to _46o , and a drive circuit 47.
It is composed of the following. Among these, when the amplification/detection circuit 43 receives the control signal OS from the wireless transmitter 21 through the antenna 43a, the amplification/detection circuit 43 amplifies and detects the control signal OS and supplies it to the waveform shaping circuit 44. The waveform shaping circuit 44 shapes the roundness of the control signal OS, which is a rectangular pulse-like signal, and supplies it to the microcomputer 45 .

Here, the reference verification code IDS, which is the same as the verification code ID stored on the wireless transmitter 21 side, is preset in the microcomputer 45 by code setting switches 46 ₁ to 46 _o . In the case of the microcomputer 45, the input control signal OS, the reference reference code IDS,
The energization of the electromagnetic solenoids 42a to 42h is controlled based on a time value ts and a program stored in advance, respectively, and the outline of the control content is shown in FIG. The above time value ts is the time width T of the header signal HS included in the control signal OS.
As shown in FIG. It is set to be shorter than the time width T.

Therefore, in the following, the control contents of the microcomputer 45 will be explained based on FIG. That is, first, when the header signal HS included in the control signal OS rises ("YES" in step a), an internal counter for measuring the time width of the header signal HS is incremented based on the reference clock (step a). b) Continue this increment until the header signal HS falls (until it becomes "YES" in step c). Therefore,
The count value of the internal counter above is the header signal
This corresponds to the time width T of HS. When the header signal HS falls, the verification code included in the control signal OS is determined based on the count value of the internal counter (that is, the time width T of the header signal HS).
The synchronization timing required to read each bit of the ID is determined (step d), and the verification code ID is read at the synchronization timing thus determined (step e). Next, the verification code ID read as described above is compared with a preset standard verification code IDS (step f), and if they do not match, the process returns to the first step a. If the verification code ID and the standard verification code IDS match, it is determined whether the time width T indicated by the count value of the internal counter is greater than or equal to a pre-stored time value ts (step g).

Here, the time value ts is longer than the time width T of the header signal HS when the unlocking operation switch 24 is turned on, as described above, and the time width when the locking operation switch 26 is turned on. Since it is set to be shorter than T, it can be determined in the determination step g which of the operation switches 24 and 26 is turned on. If it is determined "NO" in step g, that is, if the unlocking operation switch 24 is turned on, the unlocking electromagnetic solenoid 42a is activated through the drive circuit 47.
42d to unlock the door lock mechanism (step h). ``YES'' at step g
If it is determined that the lock operation switch 26
When turned on, the locking electromagnetic solenoids 42e to 42h are energized through the drive circuit 47, thereby locking the door lock mechanism (step i).

As a result of such control, if the verification code ID on the wireless transmitting device 21 side matches the standard verification code IDS on the receiving device 41 side, the unlocking operation switch 24 of the wireless transmitting device 21 is turned on. When the door is opened, the door lock mechanism is unlocked, and when the lock operation switch 26 of the wireless transmitter 21 is turned on, the door lock mechanism is locked. Also, the verification code ID on the wireless transmitter 21 side
If it does not match the reference verification code IDS on the receiving device 41 side, the wireless transmitting device 21 cannot unlock or lock the door lock mechanism.

According to the present embodiment described above, the wireless transmitter 21
The verification code ID included in the control signal OS transmitted from the control signal OS can be easily changed and set by rewriting the memory contents of the programmable ROM 37, and the reference verification code ID set on the receiving device 41 side can be easily changed.
IDS can also be easily changed and set using code setting switches 46 ₁ to 46 _o , so these verification code IDs
When making the reference verification code IDS different for each combination of the wireless transmitter 21 and the receiver 41,
There is no need to make any changes to the hardware of those devices 21 and 41. In particular, the wireless transmitting device 21, like the one with the conventional configuration shown in _FIG .
2 _o , etc. are not required, and therefore manufacturing costs can be reduced and the overall size and weight can be reduced.

In the above embodiment, electromagnetic waves are used as the air propagation medium for transmitting the control signal OS, but infrared rays or ultrasonic waves may be used instead. In addition, more types of operation switches may be provided.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and may be implemented with various modifications without departing from the gist, such as being applicable to controlling loads for other vehicles. can do.

[Effects of the Invention] According to the present invention, as is clear from the above description, there is provided a wireless transmitting device that has a plurality of types of operation switches and transmits different control signals each time the operation switches are operated. and a receiving device that operates a vehicle load corresponding to the control signal when the control signal is received, the manufacturing cost of the wireless transmitting device can be suppressed, and This has the practical effect of making the wireless transmitter smaller and lighter.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a circuit configuration diagram of a wireless transmitter, and FIG.
3 is a timing chart schematically showing the contents of control signals, FIG. 3 is a circuit configuration diagram of the receiving device and related parts, and FIG. 4 is a flowchart showing the contents of control by the receiving device. Further, FIG. 5 is a diagram corresponding to FIG. 1 for explaining the conventional example. In the figure, 21 is a wireless transmitter, 24 is an unlocking operation switch, 26 is a locking operation switch, 28 is an oscillation circuit, 35 is an adjustment circuit, and 37 is a programmable
ROM, 39 a modulation circuit, 40 a transmission circuit, 41
42a to 42d are electromagnetic solenoids for unlocking (vehicle load); 42e to 42h are locking electromagnetic solenoids (vehicle load); 43 is an amplification detection circuit; 44 is a waveform shaping circuit; 45 is a microcomputer. shows.

Claims (1)

[Claims for Utility Model Registration] A wireless transmitter that has a plurality of types of operating switches and transmits different control signals each time the operating switches are operated, and a radio transmitter that transmits a different control signal when the control signal is received. In the remote control device for a vehicle load, the wireless transmitter includes a header signal sequentially read out using a pulsed clock signal and a verification code unique to the device. A programmable ROM configured such that the output time width of the header signal and verification code is stored and changed depending on the period of the clock signal; An oscillation circuit configured to generate a clock signal and supplying the clock signal to the programmable M, and a clock signal outputted from the oscillation circuit by changing the circuit constant of this oscillation circuit for each type of operating switch operated. The receiver is configured to include an adjustment circuit that changes the period of the clock signal in multiple stages, and a transmitter circuit that transmits the header signal and collation code read from the programmable ROM in response to the clock signal as the control signal. The circuit determines the type of operation switch operated based on the time width of the header signal included in the control signal, and also determines the suitability of the control signal based on the verification code also included in the control signal. A remote control device for a vehicle load, characterized in that it is configured to include a determining means.