JPH10287210A - Load control system for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely actuate an immobilizer function even in the case of consuming a built-in battery. SOLUTION: In a transmitting control circuit 31 housed in an ignition key, when a lock/unlock key 34 is turned on by a power feed condition from a secondary battery 32, a discrimination code is transmitted. In the ignition key, an auxiliary power circuit 24 is provided. In this auxiliary power circuit 24, in a condition inserting the ignition key to an ignition key cylinder, by receiving a power signal from a transceiving ECU 1, DC power is generated, to be fed to the transmitting control circuit 31. In the control transmitting circuit 31, when a feed of power is started from the auxiliary power circuit 24, a discrimination code is transmitted. In the transceiving ECU 1, in a condition inserting the ignition key to the ignition key cylinder, when a regular discrimination code is received, start permission is given to an engine control ECU.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load control system for a vehicle having a remote key function for locking and unlocking a door lock mechanism from the vicinity of a vehicle and an immobilizer function for switching to a state in which the vehicle can run.

[0002]

In recent years, there has been provided an electronic key having a so-called immobilizer function of permitting the start of the engine in accordance with the operation of an ignition switch only when a proper electronic key is used. That is, a transmitter is built in the electronic key, and when the transmitter receives a trigger signal, the transmitter transmits an identification code stored in advance.
In this case, when the receiving device provided on the vehicle side receives the identification code from the electronic key, the receiving device determines whether the identification code matches the identification code registered in advance, and only when the identification code matches, the electronic device determines whether the identification code matches. The engine is started according to the operation of the ignition switch by the key.

Therefore, when an unauthorized electronic key is used, the transmitted identification code does not match the one registered in advance, so that the start of the engine is prohibited irrespective of the operation of the ignition switch by the electronic key. Therefore, security can be enhanced.

When an immobilizer function by a transmitter as described above is provided in a radio remote key having a built-in battery, the immobilizer function is operated by the built-in battery and an identification code by the immobilizer function is transmitted by the radio remote key. , The overall configuration can be simplified.

However, in such a configuration, when the internal battery is exhausted, not only the remote key function does not operate, but also the immobilizer function does not operate. In this case, even if the remote key function does not operate, the door lock device of the vehicle can be switched to the locked or unlocked state by the mechanical key provided integrally with the electronic key. However, when the immobilizer function does not operate, there is a problem that the engine cannot be started by the radio key.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a configuration in which a remote key function and an immobilizer function are operated by power supply from a built-in battery, even if the built-in battery is exhausted. It is an object of the present invention to provide a load control system for a vehicle capable of reliably operating a function.

[0007]

According to the present invention, a remote key function for transmitting an identification code in response to an external operation and transmitting an identification code in response to an external command is provided. A portable identification code transmitting means having an immobilizer function, and a vehicle which determines that the identification code from the identification code transmitting means matches a previously registered identification code and that the identification code is for a remote key. Receiving means for locking or unlocking the door lock mechanism for the remote key, and when the identification code from the identification code transmitting means matches the identification code registered in advance, and it is determined that the identification code is for immobilizer A vehicle load control system comprising: an immobilizer receiving means for switching to a state in which the vehicle can run. A power signal transmission means for transmitting a power signal to the separate code transmission means is provided, and the identification code transmission means includes an auxiliary power supply means for forming a power supply circuit in a power signal reception state, and when the auxiliary power supply means operates. Is configured to operate the immobilizer function (claim 1).

According to such a configuration, when the identification code transmitting means is externally operated to get on the vehicle, the identification code transmitting means transmits the identification code. Then, when the received identification code matches the identification code registered in advance and determines that the identification code is for the remote key, the remote key receiving means switches the door lock mechanism to the unlocked state. Thereby, the vehicle can be boarded with the vehicle door opened.

When the user carries the identification code transmitting means and gets on the vehicle, the power signal is transmitted from the power signal transmitting means to the identification code transmitting means. Form a circuit.
Thus, the identification code transmitting means transmits the identification code by operating the immobilizer function in response to the operation of the auxiliary power supply means.

[0010] When the received identification code matches the identification code registered in advance and determines that the identification code is for the immobilizer, the immobilizer receiving means switches to a state in which the vehicle can travel. This allows the vehicle to run.

In this case, even when the internal battery for supplying power to the identification code transmitting means is depleted, the identification code transmitting means is supplied with power from the auxiliary power supply means. Can be sent to

In the above configuration, the internal battery may be a secondary battery charged by the auxiliary power supply means.

According to such a configuration, since the secondary battery as the built-in battery is charged by the auxiliary power supply means, when the secondary battery is discharged, the secondary battery is charged in a state of receiving the power signal. be able to.

Further, the identification code transmitting means may be provided in an ignition key, and the antenna of the power signal transmitting means and the antenna of the immobilizer receiving means may be provided in a unitized state in an ignition key cylinder. Good (claim 3).

According to such a configuration, when the ignition key is inserted into the ignition key cylinder, the auxiliary power supply means of the identification code transmitting means reliably receives the power signal transmitted from the antenna of the power signal transmitting means. can do. Further, the immobilizer receiving means can reliably receive the identification code from the identification code transmitting means.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows the configuration of the entire system. In FIG. 1, the vehicle has a transmission / reception EC.
U1 (corresponding to a remote key receiving means, an immobilizer receiving means, and a power signal transmitting means of the present invention) is provided.

The transmission / reception ECU 1 is provided with a transmission antenna coil 4 for transmitting a power signal in a state where the ignition key 3 (see FIG. 2) is inserted into the ignition key cylinder 2, and the ignition key is transmitted through the transmission antenna coil 4. The power signal is transmitted to the transmission / reception unit 5 (identification code transmission means of the present invention) provided in 3.

FIG. 2 schematically shows the configuration of the transmission / reception ECU 1 by combining functional blocks. In FIG. 2, the transmission antenna coil 4 is disposed around an ignition key cylinder 2 for an automobile. When the ignition key 3 is inserted into the key cylinder 2, the transmission antenna coil 4 is connected to the transmission antenna coil 4. ,
The power signal receiving coil 6 (see FIG. 1) built in the ignition key 3 is electromagnetically coupled.

The transmission / reception ECU 1 has a CPU 7 as a center. The CPU 7 is provided with a well-known I / O provided corresponding to the ignition key cylinder 2.
On signals from the G switch 8, the key remind switch 9, the lock position switch 10, and the door courtesy switch 11 are input via the switch interface 12.

Further, a signal received by the receiving antenna coil 13 provided as a unit with the transmitting antenna coil 4 is input to the CPU 7 via a receiving circuit 14 as described later. ing.

The CPU 7 controls the transmission of the power signal through the transmission antenna coil 4 based on the output of the power amplifier 15, and also controls a door lock relay 16 and a door unlock relay 17 for locking and unlocking a door lock mechanism (not shown). A horn relay 18 for sounding a horn (not shown) is controlled through a relay interface 19. Also, CPU
Reference numeral 7 denotes a configuration for transmitting and receiving signals to and from the engine control ECU 19 through the serial interface 20. As described later, the engine start operation by the engine control ECU 19 can be selectively prohibited.

Further, the CPU 7 is configured to exchange data with the EEPROM 21.
The same identification code as that of the ignition key 3 prepared for the vehicle is stored in the PROM 21 in advance.

FIGS. 3 and 4 show the transmission antenna coil 4 and the reception antenna coil 13 provided in the ignition key cylinder 2 in a unitized state. 3 and 4, the transmission antenna coil 4 and the reception antenna coil 13 are mounted on the ignition key cylinder 2 in a unitized state by being housed in a holder 23 via an annular spacer 22. .

Next, the transmission / reception unit 5 provided on the ignition key 3 will be described with reference to FIG. When the ignition key 3 is inserted into the ignition key cylinder 2 as described above, the transmission / reception ECU 1
The power signal receiving coil 6 on the ignition key 3 side faces the transmitting antenna coil 4 on the side.

An auxiliary power supply circuit 24 as auxiliary power supply means is connected to the power signal receiving coil 6. That is, a rectifier circuit 25 is connected to both terminals of the power signal receiving coil 6, a capacitor 26 is connected in parallel to the input side of the rectifier circuit 25, and a capacitor 27 and a Zener diode 28 are connected in parallel to the output side. ing. Therefore, when the power signal receiving coil 6 receives the power signal, the power signal is rectified to a DC voltage by the rectifier circuit 25, and the power signal is lowered to a predetermined constant voltage by the Zener diode 28, and the DC power supply line 29 and Ground line 3
0 is supplied to the transmission control circuit 31.

Here, the transmission control circuit 31 is supplied with power from a secondary battery 32 as a built-in battery.
Here, the secondary battery 32 is connected to the auxiliary power supply circuit 24 via the resistor 33, and is charged by the auxiliary power supply circuit 24.

On the other hand, a lock / unlock switch 34 is connected to the input terminal SI of the transmission control circuit 31.
In this case, since the input terminal SI connected to the lock / unlock switch 34 is pulled up to the power supply voltage inside the transmission control circuit 31, the input terminal SI of the input / output terminal SI is turned on in response to the ON operation on the lock / unlock switch 34. The voltage level changes from a high level to a low level.

Here, the input terminal SI of the transmission control circuit 31
Is connected to the power signal reception detection circuit 35. The power signal reception detection circuit 35 includes an integration circuit including a resistor 36 and a capacitor 37 connected to the auxiliary power supply circuit 24, and a transistor 38 connected to the integration circuit. The collector of the transistor 38 is connected to the input terminal SI of the transmission control circuit 31, the base is connected to the capacitor 37, and the emitter is connected to the ground line 30.

Therefore, when the power signal is being received by the power signal receiving coil 6, the transistor 38 is turned on in response to the operation of the auxiliary power supply circuit 24 and the increase in the voltage of the capacitor 37. Terminal SI
Changes from the high level to the low level.

With the above configuration, the input level of the input terminal SI of the transmission control circuit 31 changes from the high level to the low level in accordance with the ON operation of the lock / unlock switch 34 or the operation of the auxiliary power supply circuit 24.

The transmission / reception control circuit 31 transmits the identification code stored in advance from the transmission antenna 39 every time the voltage level of the input terminal SI changes from the high level to the low level.

In the following, control contents of the CPU 7 of the transmission / reception ECU 1 and the transmission control circuit 31 of the transmission / reception unit 5 will be described together with the operation of related parts.

That is, the lock / unlock switch 34 of the ignition key 3 allows the driver to get on the car.
Is turned on, the transmission control circuit 31 of the transmission / reception unit 5 transmits the pre-stored identification code from the transmission antenna 39 in response to the change in the voltage level of the input terminal SI from the high level to the low level. .

The CP of the transmission / reception ECU 1 provided in the automobile
U7 receives the identification code through the reception antenna coil 13, so that the identification code is EEPRO.
It is checked whether the identification code matches the identification code stored in M21, and if it matches, it is determined whether the key remind switch 9 is in the off state.

At this time, since the key remind switch 9 is in the OFF state, it is determined that the remote control key function is to be operated, and it is confirmed whether the lock position switch 10 detects the locked state of the door lock mechanism.

In this case, since the door lock mechanism is in the locked state, the CPU 7 drives the door unlock relay 17 to switch the door lock mechanism to the unlocked state. Thus, the driver can get on the vehicle with the door of the automobile opened.

When the driver inserts the ignition key 3 into the ignition key cylinder 2 to start the engine, the key remind switch 9 is turned on, so that the CPU 7 transmits a power signal of a predetermined frequency from the transmission antenna coil 4. I do. At this time, since the transmitting antenna coil 4 on the ignition key cylinder 2 side and the receiving antenna coil 13 on the ignition key 3 side are in an electromagnetic coupling state, in the auxiliary power supply circuit 24 of the transmitting / receiving unit 5 provided in the ignition key 3, Since the power signal receiving coil 6 generates a DC voltage as the power signal is received, the capacitor 37 is charged.

When the voltage of the capacitor 37 rises to a predetermined voltage, the transistor 38 is turned on, and the voltage level of the input terminal SI of the transmission control circuit 31 changes from the high level to the low level.

Then, the transmission control circuit 31 operates the immobilizer function of transmitting the identification code stored in advance from the transmission antenna 39 in the same manner as when the lock / unlock switch 34 is turned on. .

As a result, the CPU 7 receives the identification code by the receiving antenna coil 13 and determines whether the identification code matches the one registered in advance. At this time, if the received identification code matches the identification code stored in the EEPROM 21, it is checked whether the key remind switch 9 is turned on, and then a start permission signal is given to the engine control ECU 19 to thereby enable the engine control ECU 19. Allow the engine to start.

Accordingly, in a state where the proper ignition key 3 having the matching identification code is inserted into the ignition key cylinder 2, the starting of the automobile engine through the engine control ECU 19 is permitted.
The engine can be started by operating the ignition key 3. Further, after the start of the automobile engine is permitted, the transmission of the power signal through the transmission antenna coil 4 is continued. Therefore, the transmission / reception unit 5 of the ignition key 3 outputs the rectified output of the power signal. Thereby, the secondary battery 32 is charged.

When the received identification code does not match the identification code stored in the EEPROM 21, the CPU 7 of the transmission / reception ECU 1 determines whether the engine control ECU 19
, The transmission of the power signal through the transmission antenna coil 4 is stopped.

To switch the door lock mechanism to the locked state when the driver gets off the car, the lock / unlock switch 34 of the ignition key 3 is turned on.

When the identification code is received from the transmission / reception unit 5, the CPU 7 of the transmission / reception ECU 1 drives the door lock relay 16 because the lock position switch 10 detects the unlocked state. Thereby, the door lock mechanism can be switched to the locked state.

In the state where the ignition key 3 is inserted into the ignition key cylinder 2 as described above, the secondary battery 32 of the transmission / reception unit 5 provided in the ignition key 3 is charged, but the ignition is performed for a long time. If the state where the key 3 is not inserted into the ignition key cylinder 2 continues, the secondary battery 32 may be discharged.

In such a case, since power is not supplied from the secondary battery 32 to the transmission control circuit 31 of the transmission / reception unit 5, the transmission control circuit 31 stops responding regardless of the operation of the lock / unlock switch 34,
It seems that the door lock mechanism cannot be switched to the locked or unlocked state.

However, since the door lock mechanism can be directly switched to the locked state or the unlocked state by the mechanical key of the ignition key 3, no trouble occurs.

On the other hand, when the secondary battery 32 of the transmitting / receiving unit 5 is discharged, the transmission control circuit 31 starts charging the secondary battery 32 by receiving the power signal. Since it takes a long time to rise from the discharged state to the voltage required for the operation of the transmission / reception circuit, the immobilizer function of the transmission / reception control circuit 31 does not operate, and the engine may not be started.

In such a case, in this embodiment, when the ignition key 3 is inserted into the ignition key cylinder 2 and the power signal receiving coil 6 receives the power signal, the DC voltage generated by the power signal is reduced. Since power is directly supplied to the transmission control circuit 31, the transmission / reception control circuit 31 can operate. Then, when the voltage of the capacitor 37 rises to a predetermined voltage, the transistor 38 is turned on, so that the voltage level of the input terminal SI of the transmission control circuit 31 changes from the high level to the low level. Thereby, the transmission / reception control circuit 31 can transmit the identification code stored in advance from the transmission antenna 39. Accordingly, the CPU 7 of the transmission / reception ECU 1 receives the identification code by the reception antenna coil 13 and permits the start of the engine.

Then, when the ignition key 3 is inserted into the ignition key cylinder 2,
Since the secondary battery 32 of the transmitting / receiving unit 5 is charged by the power signal, the power supply state of the secondary battery 32 to the transmission control circuit 31 is restored when the charging is sufficiently performed.

According to the above configuration, the power signal is transmitted to the transmission / reception unit 5 of the ignition key 3 while the ignition key 3 is inserted into the ignition key cylinder 2, and the transmission / reception unit 5 provided on the ignition key 3 is provided. The auxiliary power supply circuit 24 generates a power supply voltage based on the received power signal and
1, the transmission control circuit 31 inserts the ignition key 3 into the ignition key cylinder 2 even if the secondary battery 32 for supplying power to the transmission control circuit 31 is discharged. The identification code can be transmitted at the specified timing. Therefore, unlike the conventional example in which the immobilizer function is operated only by the power supply from the built-in battery, the engine start can be permitted by always operating the immobilizer function regardless of the state of charge of the secondary battery 32.

When the ignition key 3 is inserted into the ignition key cylinder 2,
Since the internal battery is recharged, there is no need to replace the internal battery as compared with a configuration using a primary battery as the internal battery, and the usability is extremely excellent.

Further, in the transmission / reception ECU 1, the transmission antenna coil 4 and the reception antenna coil 13 are mounted on the ignition key cylinder 2 in a unitized state, so that the transmission / reception unit 5 of the ignition key 3 is reliably supplied with electric power. The signal can be transmitted, the identification code can be reliably received from the transmission control circuit 31 of the transmission / reception unit 5 even if the transmission strength of the identification code is low, and the overall size can be reduced.

The present invention is not limited to the above embodiment, but can be modified or expanded as follows. The ON signal from the lock / unlock switch 34 and the ON signal due to the turning on of the transistor 38 may be input to different input terminals of the transmission control circuit 31. In this case, the transmission control circuit 31 adds the code for the remote key or the code for the immobilizer function to the identification code according to each input and transmits the identification code, so that the transmission / reception ECU 1 can determine the type of the received identification code. .

The transmission / reception unit 5 of the ignition key 3
A primary battery may be used instead of the secondary battery 32 as the built-in battery provided in. As means for detecting that the transmission control circuit 31 of the transmission / reception unit 5 has received the power signal, the transmission control circuit 31 has a function of monitoring a change in the power supply voltage and detecting the change based on a sharp increase in the power supply voltage. May be provided.

[0056]

As is apparent from the above description, according to the vehicle load control system of the present invention, in the configuration in which the remote key function and the immobilizer function are operated by power supply from the built-in battery, the identification code transmitting means is provided with a predetermined code. When set to the position, the power signal is transmitted to the identification code transmission means, and the identification code transmission means is configured to transmit the identification code when power is supplied by receiving the power signal. Even in this case, there is an excellent effect that the immobilizer function can be reliably operated.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an entire system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a transmission / reception ECU.

FIG. 3 is a cross-sectional view showing a holder mounted on the ignition key cylinder in a state where the antenna is unitized;

FIG. 4 is an enlarged sectional view of a holder.

[Explanation of symbols]

1 is a transmission / reception ECU (reception means for remote keys, reception means for immobilizer, power signal transmission means), 2 is an ignition key cylinder, 3 is an ignition key, 4 is a transmission antenna coil, 5 is a transmission / reception unit (identification code transmission means). , 6 is a power signal receiving coil, 7 is a CPU, 9 is a key reminder switch, 13 is a receiving antenna coil,
19 is an engine control ECU, 21 is an EEPROM, 24
Denotes an auxiliary power supply circuit (auxiliary power supply means), and 32 denotes a secondary battery (built-in battery).

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F02N 15/00 F02N 15/00 F H04Q 9/00 301 H04Q 9/00 301B

Claims (3)

[Claims] 1. A portable type provided with power supplied by a built-in battery and having a remote key function of transmitting an identification code in response to an external operation and an immobilizer function of transmitting an identification code in response to an external command. When the identification code from the identification code transmitting means matches the identification code registered in advance and the identification code is determined to be for a remote key, the vehicle door lock mechanism is locked or unlocked. Receiving means for a remote key to be locked; and an immobilizer for switching to a vehicle operable state when the identification code from the identification code transmitting means matches the identification code registered in advance and the identification code is determined to be for the immobilizer. A load control system for a vehicle, comprising: A power signal transmitting unit for transmitting a signal, the identification code transmitting unit includes an auxiliary power supply unit for forming a power supply circuit in a state of receiving the power signal, and the immobilizer function is operated when the auxiliary power supply unit operates. A load control system for a vehicle, characterized in that: 2. The battery according to claim 1, wherein the internal battery is a secondary battery charged by the auxiliary power supply.
The load control system for a vehicle according to any one of the preceding claims. 3. The ignition code transmitting means is provided on an ignition key, and the antenna of the power signal transmitting means and the antenna of the immobilizer receiving means are provided in a unitized state on an ignition key cylinder. The vehicle load control system according to claim 1 or 2, wherein: