JP3301523B2 - On-board equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle device having a checking function.

[0002]

2. Description of the Related Art In an on-vehicle apparatus used for vehicle control, a transmission unit and a reception unit are regularly inspected as means for detecting failure or deterioration of elements constituting a circuit. In the transponder type on-board device, power wave transmission level checking is further performed.

[0003] In these on-vehicle devices, as a means for avoiding a system failure in the event of a failure, a multiplex system configuration including a standby system as well as a normal system may be employed. Conventionally, when a multiplex system configuration is adopted, an independent transmitting unit and receiving unit are provided for each system, and these transmitting units and receiving units are individually connected to on-board antennas provided independently of each other. Was.

[0004] For this reason, the number of on-vehicle antennas corresponding to the number of systems is required, leading to an increase in the cost of on-board equipment.

[0005] Attempts to share one vehicle antenna between systems have been considered, but it is difficult to synchronize transmission and reception.
It has been difficult to execute the checking function provided in each system without causing interference between the systems.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide an on-vehicle apparatus in which one on-vehicle antenna is shared between systems to simplify the configuration and reduce costs.

Another object of the present invention is to provide an on-vehicle apparatus capable of executing a checking function provided for each system without causing interference between the systems, while sharing one on-vehicle antenna between the systems. It is to be.

[0008]

To solve the above-mentioned problems, an on-vehicle apparatus according to the present invention includes a plurality of systems having a transmitting section and a receiving section, and one on-vehicle antenna. The receiving unit of each system has a circuit whose input side is guided to the on-vehicle antenna and individually extracts and decodes a transmission signal and a reception signal.

The transmission unit of each system includes a circuit for generating the transmission signal, a circuit for generating a reference signal having a frequency substantially equal to the frequency of the reception signal, and a circuit capable of superimposing the reference signal on the transmission signal. And the output side is guided to the on-vehicle antenna.

[0010] Of the plurality of systems, the transmission unit of the system that can be a standby system has the output terminal guided to the on-vehicle antenna via switching means, and the transmission unit of the own system is provided before the switching means. A level test circuit for detecting the level of the transmission signal output from the section is connected.

As described above, the on-vehicle apparatus according to the present invention includes one on-vehicle antenna, the input side of the plurality of receiving units of each system is guided to the on-vehicle antenna, and the transmission of each system is performed. The output side of the unit is also guided to the on-vehicle antenna. Therefore, one on-vehicle antenna can be shared between the systems, and the configuration can be simplified and the cost can be reduced.

The receiving section of each system has a circuit for extracting and decoding a received signal. Therefore, in each system, the vehicle control can be performed by decoding the reception signal supplied from the ground side.

The transmission section of each system has a circuit for generating a transmission signal. Therefore, the transmission signal can be supplied to the onboard antenna, and the onboard information can be transmitted to the ground side.

The receiving section of each system has a circuit for extracting and decoding the transmission signal of the own system. Therefore, when each system is used as a normal system, the receiving unit of the own system extracts the transmission signal transmitted from the transmitting unit of the own system, and
By decoding, it is possible to check whether the transmission unit of the own system is normal or abnormal.

The transmission section of each system has a circuit for generating a reference signal having the same frequency as the received signal, and a circuit capable of superimposing the reference signal on the transmission signal. It is connected. Therefore, when each system is used as a normal system, the reference signal having the same frequency as the reception signal is obtained from the superposition signal of the transmission signal frequency and the reference signal transmitted from the transmission unit of the own system in the reception unit of the own system. By extracting and deciphering, the normality and abnormality of the receiving unit of the own system can be checked.

[0016] Among the plurality of systems, the system that can be a standby system is such that the output side of the transmitting unit is guided to the onboard antenna via the switching means.
Has been. Therefore, in the case of using as a standby system, in order to execute the check of the transmission unit of the own system, the switching unit is opened so that the check transmission signal does not enter another system, Interference can be avoided.

In a system that can be a standby system, a level verification circuit for detecting an output signal level is connected to a stage preceding the switching means, so that the checking of the transmission unit can be performed through the level verification circuit.

As described above, the receiving unit of the system which can be a standby system has a circuit for extracting and decoding the received signal, and therefore, the receiving unit of the own system has
For example, by extracting and decoding a received signal included in a superimposed signal transmitted from another system as a check signal, it is possible to check whether the receiving unit of the own system is normal or abnormal.

Other objects, features and advantages of the present invention will be described below with reference to the accompanying drawings.

[0020]

FIG. 1 is a block diagram showing the configuration of an on-board device according to the present invention. The on-board device according to the present invention,
A system A having a transmission unit 11 and a reception unit 12, and a transmission unit 21
B having an antenna and a receiving unit 22 and one on-vehicle antenna 3
And The systems A and B are commonly connected to the on-vehicle antenna 3. The systems A and B are guided to the on-vehicle antenna 3 via the coupling means 5 by wires 41 and 42 such as cables.

The receiving section 12 of the system A individually extracts and decodes the transmission signal fs and the reception signal fr. As a specific configuration, the receiving unit 12 includes two filters 12 on the output side of a coupling unit 121 such as a transformer connected to the wiring 41.
2 and 123 are branched and connected, and the filter 12
Output terminals 2 and 123 are individually connected to contacts C11 and C12 of the changeover switch 124. Filter 122
Extracts the transmission signal fs, and the filter 123 outputs the reception signal fs.
Extract r. The transmission signal fs is, for example, 3 MHz, and the reception signal fr is, for example, 1.7 MHz. Switch 1
The 24 common contacts C01 are connected to the input terminal of the demodulator 125.

The transmission unit 11 of the system A can generate a transmission signal fs, a circuit that generates a reference signal fc having the same frequency as the reception signal fr, and can superimpose the reference signal fc on the transmission signal fs. It has a circuit, and the output side is guided to the on-vehicle antenna 3 via the wiring 41 such as a cable and the coupler 5.

The circuit for generating the transmission signal fs includes the modulator 1
11. The circuit for generating the reference signal fc having the same frequency as the reception signal fr is also provided by the modulator 11.
2. The circuit capable of superimposing the reference signal fc on the transmission signal fs includes the switch 113,
One end of the switch 113 is connected to the output side of the modulator 112, and the other end is connected to the output end of the modulator 111. The connection point between the switch 113 and the modulator 111 is led to the input terminal of the amplifier 114. Amplifier 11
4 is connected to a coupling means 115 such as a transformer.

The receiving section 22 of the system B individually extracts and decodes the transmission signal fs and the reception signal fr. As a specific configuration, the receiving unit 22 includes two filters 22 on the output side of a coupling unit 221 such as a transformer connected to the wiring 42.
2 and 223 are branched and connected.
Output terminals 2 and 223 are individually connected to contact points C21 and C22 of the changeover switch 224. Filter 222
Extracts the transmission signal fs, and the filter 223 outputs the reception signal fs.
Extract r. Common contact C0 of the changeover switch 224
2 is connected to the input terminal of the demodulator 225.

The transmission section 21 of the system B can generate a transmission signal fs, a circuit that generates a reference signal fc having the same frequency as the reception signal fr, and superimpose the reference signal fc on the transmission signal fs. It has a circuit, and the output side is guided to the on-vehicle antenna 3 via the wiring 42 such as a cable and the coupler 5.

The circuit for generating the transmission signal fs includes the modulator 2
11. The circuit for generating the reference signal fc having the same frequency as the reception signal fr is also provided by the modulator 21.
2. The circuit capable of superimposing the reference signal fc on the transmission signal fs includes the switch 213,
One end of the switch 213 is connected to the output side of the modulator 212, and the other end is connected to the output end of the modulator 211. The connection point between the switch 213 and the modulator 211 is led to the input terminal of the amplifier 214. Amplifier 21
4 is connected to a coupling means 215 such as a transformer.

When a service system and a standby system are configured by the systems A and B, both the systems A and B can be a service system or a standby system. When the system A is used as a normal system and the system B is used as a standby system, the output terminal of the transmission unit 21 of the system B serving as the standby system is guided to the on-vehicle antenna 3 via the switching unit 216. The contact C31 of the switching means 216 is connected to the wiring 42, and the contact C32 is connected to the dummy load 217. The common contact C03 is connected to the coupling means 215. A level test circuit 218 that detects the level of the transmission signal fs is connected to a stage preceding the switching unit 216.

In this embodiment, it is assumed that the system A is used as a standby system, and the output end of the transmission unit 11 is also guided to the on-vehicle antenna 3 via the switching means 116 in the system A. The contact C41 of the switching means 116 is connected to the wiring 41,
The contact C42 is connected to the dummy load 117. The common contact C04 is connected to the coupling means 115. Further, a level test circuit 118 that detects the level of the transmission signal fs of the own system is connected to a stage preceding the switching unit 116.

The transmitting section 11 and the receiving section 12 are integrally controlled by an information processing apparatus 6 such as a computer, and the transmitting section 21 and the receiving section 22 are totally controlled by an information processing apparatus 7 such as a computer.

Further, in the embodiment, as the transponder on-board device, power wave generators 81 and 82 are provided. The power wave generation unit 81 of the system A includes a power wave amplification unit 811 and an A / D converter 8.
12 are included. The power wave amplifier 811 creates and amplifies a power wave having a frequency suitable for driving a transponder (not shown) installed on the ground. Power wave amplifier 8
The power wave output from 11 is supplied to a wiring 43 such as a cable via a transformer 813, and transmitted to the ground side via the coupling means 5 and the on-board antenna 3.

A / D converter 812 is a power wave amplifier 811
A / D conversion is performed on the power wave supplied from the power wave amplifying unit 811 via the transformer 814, and the digital data is transmitted to the information processing device 6. Transmit.

The power wave generator 82 of the system B also includes a power wave amplifier 821 and an A / D converter 822. The power wave amplifier 821 generates and amplifies a power wave having a frequency suitable for driving a transponder installed on the ground. The power wave output from the power wave amplifier 821 is supplied to the wiring 43 via the transformer 823, and transmitted to the ground via the coupling means 5 and the on-vehicle antenna 3.

The A / D converter 822 includes a power wave amplifier 82
1 through the transformer 824 to A / D
The digital data is converted and transmitted to the information processing device 7. The power wave generation unit 82 included in the system B serving as a standby system includes:
The output terminal of the transformer 823 is connected to the wiring 43 via the switching means 825. Contact C51 of switching means 825
Is connected to the wiring 43, and the contact C52 is connected to the dummy load 82.
6 is connected. The common contact C05 is connected to the transformer 823.

In this embodiment, assuming that the system A is used as a standby system, the power wave generator 81 is connected to the switching means 815 connected to the wiring 43 via the switching means 815 at the output end of the transformer 813. The contact C61 is connected to the wiring 43, and the contact C62 is connected to the dummy load 816. The common contact C06 is connected to the transformer 813.

The transmitting unit 11, the receiving unit 12, and the power wave generating unit 81 are totally controlled by an information processing device 6 such as a computer. The transmitting unit 21, the receiving unit 22, and the power wave generating unit 82 are information processing devices such as a computer. It is generally controlled by the device 7.

Next, the operation will be described.

(1) Operation of power wave generator, receiver and transmitter when system A is used as a normal system and system B is used as a standby system. FIG. 1 shows a case where system A is used as a normal system and system B is used as a standby system. FIG. 3 shows a circuit configuration when receiving a reception signal fr (for example, 1.7 MHz) and transmitting a transmission signal fs.

(A) The power wave generator 81 of the system A Since the system A is commonly used, in the power wave generator 81, the contact C06 of the switching means 815 conducts to the contact C61, and the power wave passes through the wiring 43. It is supplied to the coupling means 5 and the on-vehicle antenna 3. A part of the power wave is supplied to the A / D converter 812. The A / D converter 812 converts the power wave into a digital signal and supplies the digital signal to the information processing device 6.
The information processing device 6 checks the level of the power wave based on the digital signal supplied from the A / D converter 812.

(B) Receiver A of System A In the receiver 12, the contact C01 of the switching means 124
Is connected to the contact C12, the received signal fr is extracted by the filter 123. The extracted reception signal fr is demodulated by the demodulator 125 and further decoded by the information processing device 6 such as a computer.

(C) Transmission section 11 of system A In the transmission section 11, the transmission signal fs transmitted from the modulator 111 is amplified by the amplifier 114, guided to the wiring 41 through the transformer 115 and the switching means 116, and coupled. It is supplied to the on-vehicle antenna 3 via the means 5. The transmission and reception timings are controlled by the information processing device 6.

(D) System B power wave generator 82 In the system B power wave generator 82 operating as a standby system, the contact C05 of the switching means 825 is electrically connected to the contact C52. Therefore, the power wave is consumed by the dummy load 826 connected to the contact C52.

(E) Receiving unit 22 of system B In the receiving unit 22, the contact C02 of the switching means 224
Is connected to the contact C22, the received signal fr is extracted by the filter 223. The extracted received signal fr is demodulated by the demodulator 225 and further decoded by the information processing device 7 such as a computer.

(F) Transmission section 21 of system B In the transmission section 21, the switching means 216 operates at the contact point C03.
Is connected to the contact C32. Therefore, the modulator 211
, And the transmission signal fs amplified by the amplifier 214.
Flows to the dummy load 217 connected to the contact C32, and is consumed thereby. Part of the transmission signal fs is
It is supplied to the level test circuit 218. Level test circuit 2
Reference numeral 18 supplies a level verification signal to the information processing device 7. The information processing device 7 transmits the transmission signal f based on the level verification signal.
Check the level of s.

(2) Inspection when the system A is used as the normal system and the system B is used as the standby system The inspection is periodically performed according to a command from the information processing devices 6 and 7.

(A) Checking of the power wave generator 81 of the system A The information processing device 6 reads the digital data of the A / D converter 812 periodically. Compared to the conventional case where the checking is performed with or without the level detection signal, there is an advantage that the level of the power wave can be quantitatively determined as digital data.

(B) Inspection of Receiver A of System A FIG. 2 is a circuit diagram in the case of inspection of the receiver of system A. The switching unit 113 is periodically turned on based on a command from the information processing device 6. Thereby, the normal transmission signal fs
Is superimposed on the reference signal fc. Superimposed signal (fs + fc)
Is an amplifier 114, a transformer 115, and a switching means 11
6, and is supplied to the receiving unit 12. In the receiving unit 12,
The check signal fc included in the superimposed signal (fs + fc) is extracted by the filter 123. And the demodulator 12
5, the information processing device 6 compares the electronic message of the inspection signal fc transmitted from the transmission unit 11 with the content of the received electronic message, thereby executing the inspection of the reception unit 12.

(C) Inspection of Transmission Unit 11 of System A FIG. 3 is a circuit diagram in the case of inspection of the transmission unit of System A.
In response to a command from the information processing device 6, the contact C01 of the switching means 124 included in the receiver 12 is periodically switched to the contact C11 in synchronization with the transmission signal fs transmitted from the transmitter 11.
Connect to The conduction time of the contacts C11-C01 may be the time during which the transmitted transmission signal fs becomes one message length. As a result, the transmission signal fs of one message length transmitted from the transmission unit 11 is extracted by the filter 122. The extracted transmission signal fs is taken into the demodulator 125 and demodulated through a conduction path formed between the contact point C11 and the contact point C01. The demodulated signal is input to the information processing device 6 and decoded. The information processing device 6 compares the content of the message of the received transmission signal fs with the content of the message currently transmitted from the transmission unit 11 to execute the check of the transmission unit 11.

(D) Inspection of System B Receiver 22 FIG. 4 is a circuit diagram in the case of system B receiver inspection.
In response to a command from the information processing device 7, the contact C02 of the switching unit 224 included in the receiving unit 22 is always connected to the contact C22. The inspection signal fc having the same frequency as the reception signal fr is extracted by the filter 223 from the superimposed signal (fs + fc) transmitted from the transmission unit 11 of the system A. Is taken into the demodulator 225 through the conduction path formed in the demodulator and demodulated. The demodulated signal is input to the information processing device 7 and checked. The checking is performed by confirming the message content of the transmission signal fc and the checking of the checking cycle determined by the information processing device 7 together.

(E) Verification of Transmission Unit 21 of System B FIG. 5 is a circuit diagram in the case of verification of the reception unit of system B.
In response to a command from the information processing device 7, the contact C02 of the switching means 224 included in the receiving unit 22 is periodically switched to the contact C2.
Connect to 1. By this switching, the transmission unit 11 of the system A
The transmission signal fs transmitted from is extracted by the filter 222. The extracted transmission signal fs passes through a conduction path formed between the contact point C21 and the contact point C02, and passes through the demodulator 2
25 and demodulated. The demodulated signal is input to the information processing device 7 and decoded. The information processing device 7 checks the transmission unit 21 by comparing the content of the message of the transmission signal fs received by the reception unit 22 with the content of the message currently transmitted from the transmission unit 11 of the system A. . The conduction time of the contacts C21-C02 is determined so that the transmitted transmission signal fs includes a message length longer than one message length, for example, three message lengths. By doing so, one message length can be reliably received.

As is apparent from the above description, the checking of the transmission unit 21 in the system B is executed based on the transmission signal fs transmitted from the system A which is another system, and
This is not a configuration in which the transmission unit 21 of the own system is checked. To compensate for this, a level test circuit 218 is provided. A part of the transmission signal fs is supplied to the level test circuit 218. The level test circuit 218 supplies a level test signal to the information processing device 7. The information processing device 7 checks the level of the transmission signal fs based on the level verification signal.

(F) System B power wave generator 82 In the system B power wave generator 82 operating as a standby system, a part of the power wave is converted into a digital signal by the A / D converter 82, and information processing is performed. It is supplied to the device 7. The information processing device 7 checks the level of the power wave based on the digital signal supplied from the A / D converter 822.

Although the system A has been described as a normal system and the system B as a standby system, the system A may be used as a standby system and the system B may be used as a normal system. The operation in this case shall be interpreted by alternately exchanging the description of the systems A and B.

[0053]

As described above, according to the present invention, the following effects can be obtained. (A) A single on-board antenna can be shared between systems, and an on-board device with a simplified configuration and reduced cost can be provided. (B) It is possible to provide an on-vehicle device capable of executing the checking function provided for each system without causing interference between systems while sharing one vehicle-mounted antenna between the systems.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an on-board device according to the present invention.

FIG. 2 is a circuit diagram in the case of checking a receiving part of a regular system A included in an on-vehicle device according to the present invention.

FIG. 3 is a circuit diagram in the case of checking a transmission unit of a regular system A included in the on-board device according to the present invention.

FIG. 4 is a circuit diagram in the case of checking a receiving unit of a standby system B included in the on-board device according to the present invention.

FIG. 5 is a circuit diagram in the case of checking a transmission unit of a standby system B included in the on-vehicle apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Transmission part of system A 12 Reception part of system A 21 Transmission part of system B 22 Reception part of system B 3 On-board antenna 111 Circuit which generates a transmission signal 112 Circuit which generates an inspection signal 113 Circuit which can superimpose an inspection signal Reference Signs List 116 Switching means 118 Level verification circuit 122 Filter for extracting transmission signal 123 Filter for extracting reception signal 211 Circuit for generating transmission signal 212 Circuit for generating reference signal 213 Circuit for superimposing reference signal 216 Switching means 218 Level verification circuit 222 Filter for Extracting Transmitted Signal 223 Filter for Extracting Received Signal

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-213947 (JP, A) JP-A-6-87448 (JP, A) JP-A-9-132142 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) B61L 3/12

Claims (1)

(57) [Claims] A plurality of systems having a transmission unit and a reception unit;
An on-vehicle device including one on-vehicle antenna, wherein a receiving unit of each system has an input side guided to the on-vehicle antenna,
It has a circuit for extracting and decoding the transmission signal and the reception signal individually, and a transmission unit of each system, a circuit for generating the transmission signal, a circuit for generating a reference signal having the same frequency as the reception signal ,
And has a circuit capable of superimposing the Shosa signal to the transmission signal, the output side is guided to the vehicle on the antenna, among the plurality of systems, the said transmission part of the system can become a standby system, the output An on-vehicle device whose end is guided to the on-vehicle antenna via switching means, and a level verification circuit for detecting the level of a transmission signal output from its own transmission unit is connected to a stage preceding the switching means. .