JPH0338043Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Industrial Application Field) The present invention relates to a control circuit for preventing theft of a vehicle, and more specifically, it provides an alarm when any door, bonnet, or trunk of a vehicle is unlocked by an unauthorized means other than a key. The present invention relates to a control circuit for an automobile anti-theft system, etc., which emits an anti-theft system. (Prior Art) In recent years, anti-theft systems have been developed that issue an alarm when a locked car door, bonnet or trunk is opened by an unauthorized means other than a key, and these systems are not actually installed in cars. There is. This type of anti-theft system for cars goes into a standby state when a switch installed in a hidden location of the car is operated, and if the car is stolen by unauthorized means other than the key. It is configured to issue an alarm immediately when a door or the like is opened. By the way, if power is directly supplied to the control circuit that controls such an automobile anti-theft system from the vehicle's battery, the output voltage of which changes greatly due to load fluctuations or changes in battery liquid temperature, the output voltage will change due to changes in the output voltage. The above control circuit may malfunction. For this reason, the above-mentioned anti-theft systems for automobiles and the like have conventionally been provided with a stabilizing power supply circuit as shown in FIG. 7, for example, which stabilizes and supplies the output voltage of the battery. The stabilized power supply circuit shown in FIG. 7 basically consists of a battery (not shown) connected to an input terminal 100, supplied with current Iz through a resistor 101, and an output voltage (Zener) of a Zener diode 102 that outputs a constant voltage. A control circuit 1 of an automobile anti-theft system supplies voltage) Vz to the base of a control transistor 103 and connects the emitter side of this control transistor 103 to an output terminal 104.
It has a configuration that supplies a stabilized output voltage to 05 and other loads. In this stabilized power supply circuit, a diode 106 is provided on the collector side of the control transistor 103 for absorbing surge voltage and removing noise.
A surge absorber (ZNR) 107 and capacitors 18 and 109 are connected, and a capacitor 110 is also connected to the emitter side of the control transistor 103. By the way, in the stabilized power supply circuit as described above, the current amplification factor of the control transistor 103 is h _FE
If the base current of the control transistor 103 is I _B when a load current of I _L is supplied from the emitter of the control transistor 103 to the control circuit 105 and other loads, then I _B = I _L /(h _FE +1)≒I _L /h _FE . That is, the base current I _B of the control transistor 105 changes in proportion to the change in the load current I _L , and as the load current increases, the base current I _B also increases. This base current I _B is supplied by a Zener diode 102. Therefore, the Zener diode 102 has a maximum load current supplied from the emitter of the control transistor 103 to the load at least at the maximum load.
It must be possible to supply a maximum base current I _Bnax corresponding to I _Lnax . Therefore, in the stabilized power supply circuit shown in Fig. 7, when there is no load (I _L = 0), the Zener diode 102 has a current that is slightly larger than I _Bnax I _Bnax + α = I _Lnax /h _FE + α ... (1 ) The resistance value of the resistor 101 is set so that the current . This current I _Bnax +α mostly flows to the Zener diode 102 when the car is parked in a garage or the like and the anti-theft system for the car does not function, that is, when the load current I _L is small.
It is wasted as so-called wasted current. As is clear from the first equation above, the smaller the current amplification factor h _FE of the control transistor 103, the larger this waste current becomes.
This waste current causes a problem in that the battery mounted on the vehicle is completely discharged in a relatively short period of time, resulting in so-called battery drain. (Purpose of the invention) The present invention was made to solve the above-mentioned problems in the anti-theft control circuit of a vehicle. An object of the present invention is to provide a control circuit for preventing theft of a vehicle. (Structure of the invention) Therefore, the present invention uses a Darlington connection between a large current transistor and a small current transistor in a vehicle theft prevention control circuit that is powered and activated when the vehicle is stopped. A power supply circuit is provided in which a current transistor is connected to a Zener diode, and a stabilized voltage is supplied from the emitter of the large current transistor to the control circuit. That is, in the present invention, the control transistor of the control circuit of the power supply circuit that supplies a stabilized voltage to the control circuit is configured by a Darlington connection of a large current transistor and a small current transistor, and the current amplification of the control transistor is The ratio is the product of the current amplification factor of the large current transistor and the current amplification factor of the small current transistor, and the wasted current flowing through the Zener diode can be significantly reduced. (Effects of the invention) According to the invention, the control transistor used for the power supply of the vehicle anti-theft circuit is configured by a Darlington connection of a large current transistor and a small current transistor. The waste current flowing to the Zener diode that supplies this can be significantly reduced,
It is possible to prevent battery build-up due to this wasted current. (Example) Hereinafter, the present invention will be specifically described with reference to drawings showing an example in which the present invention is applied to an automobile anti-theft system. In FIG. 1, the control unit 11
The circuit has a function as a control circuit for an automobile anti-theft system to be described below, and is composed of a one-chip microcomputer and associated parts. This control unit 11 controls power supply and power supply stop to input terminals 11a, 11b, . Output terminal 1 that outputs command signals
1p ₁ , output terminal 11p ₂ that outputs a signal indicating the operating state of the system, output terminal 11q, ..., 11t that outputs a signal that commands an alarm, option terminal 11u, power terminal 11v, and ground terminal 11w.
have. In the control unit 11, a voltage obtained by stabilizing the output voltage of the battery B is supplied to the power supply terminal 11v from a power supply circuit 70, which will be described below. The power supply circuit 70 includes a Zener diode D ₂ ,
It consists of a resistor R ₁ that supplies current to this Zener diode D ₂ , a large current transistor Q ₁ , and a small current transistor Q ₂ . One end of this resistor _R1 is connected to the cathode of a reverse voltage prevention diode _D3 , and the other end is connected to the cathode of a Zener diode _D2 . This zener diode
The anode of D ₂ is connected to ground. The large current transistor Q ₁ and the small current transistor Q ₂ are Darlington connected.
That is, the collector of the large current transistor _Q1 and the collector of the small current transistor _Q2 are connected to each other, and the base of the large current transistor _Q1 is connected to the emitter of the small current transistor _Q2 . The large current transistor _Q1 has its emitter connected to the power supply terminal 11v of the control unit 11 through the fuse _F4 , its collector connected to the cathode of the diode _D3 , and
The base of the small current transistor Q ₂ is connected to the cathode of the Zener diode D ₂ . The diode D ₃ above has an anode connected to the fuse F ₃
A surge absorber ZNR and capacitors _C1 and _C2 for noise removal are connected between the cathode and the ground. On the other hand, a capacitor C3 for preventing oscillation is connected between the emitter of the large current transistor _Q1 and the base of the small current transistor _Q2 , and a capacitor _C3 is connected between the emitter of the large current transistor _Q1 and the ground. A capacitor _C4 for noise removal is also connected to the capacitor C4. The output voltage of the power supply circuit 70 described above is also supplied to a sensor power supply control circuit 71 consisting of transistors Q ₃ , Q ₄ and resistors R ₂ , R ₃ , R ₄ and R ₅ . This sensor power supply control circuit 71 turns on and off power supply to various sensors that detect abnormal signals in accordance with a signal output from the output terminal _11p1 of the control unit 11. The emitter of the transistor Q ₃ is connected to the emitter of the large current transistor Q ₁ of the power supply circuit 70, a resistor R ₅ is connected between the base and the emitter, and the collector is connected to various sensors described later through the terminal 71a. is connected to the power supply control terminal 71a. On the other hand, the transistor _Q4 has an emitter connected to the ground, and a base connected to a resistor connected in series between the output terminal _11p1 of the control unit 11 and the ground.
At the connection point of R ₂ and R ₃ , and the collector is a resistor R ₄
is connected to the base of transistor _Q3 through. Next, power terminal 1 of control unit 11
The circuits connected to each terminal other than 1v will be explained. An input terminal 11a of the control unit 11 is connected to an ignition terminal IG1 of an ignition switch 12. The ignition switch 12 is turned on from when a key (not shown) is inserted and turned beyond a predetermined position until it is turned back and the key is pulled out; A keyless switch 13 is provided which is turned off while the key is inserted and rotated to a predetermined position.
It is connected between the positive (plus) pole of a battery B whose negative pole is grounded and the input terminal 11b of the control unit 11 via fuses F ₁ and F ₂ . Further, as shown in FIG. 2, there are connections between the input terminal 11c of the control unit 11 and the ground, between the input terminal 11d and the ground, and between the input terminal 11e and the ground on the passenger seat side of the automobile 14. door key cylinder switch 16L installed on the door 15L of the driver's seat, door key cylinder switch 16R installed on the driver's side door 15R, and the trunk (5
In the case of a door car, a key cylinder switch 18 provided on a back door (17) is connected respectively. Input terminal 11 of the control unit 11 above
As shown in FIG. 2, there are a door 15R on the driver's side and a door 15L on the passenger side
Front lock link switches 19R and 19L provided respectively are connected. Input terminal 11 of the control unit 11 above
As shown in Figure 2, between G and ground, there is a rear lock link switch 21L installed on the left door 20L on the rear seat side, and a rear lock link switch 21L installed on the right door 20R on the rear seat side. The link switches 21R are connected to each other. Input terminal 11 of the control unit 11 above
As shown in Fig. 2, an inner lock switch 22R provided on the driver's side door 15R and an inner lock switch 22L provided on the passenger side door 15L are connected between h and ground. has been done. Similarly, between the input terminal 11i of the control unit 11 and the ground, as shown in FIG. The inner lock switch 23R provided on the door 20R is connected. By the way, the mechanism for locking and unlocking the door 15R of the automobile 14 is provided on the outer handle 24 provided on the outside of the door 15R and on the inside of the door 15R, as shown in FIG. 3 for the door 15R on the driver's seat side. The action of the inner handle 25 is transmitted to the door lock mechanism 27 via the lock mechanism 26, and when the door key cylinder 28 or the inner lock knob 29 is operated to the lock side, the lock mechanism 26 is activated. The actions of the outer handle 24 and inner handle 25 are cut off, and the door is locked. In Fig. 3 above, key cylinder switch 1
6R is turned on only during the key operation period of the door key cylinder 28, and turned off in other states. In addition, the inner lock switch 22R is the inner lock knob 2.
It turns on when the switch 9 is operated toward the unlock position. Furthermore, lock link switch 19R
turns on when the lock mechanism 26 is unlocked. The mechanism for locking and unlocking the door 15L on the passenger seat side also has the same structure as that shown in FIG. 3. Note that the door key cylinder 28 is not provided in the rear seat doors 20L and 20R. Referring again to Figure 1, control unit 1
A left door switch 32L and a right door switch 32R on the rear seat side are connected between the input terminal 11j of No. 1 and the ground. Further, the input terminal 11j of the control unit 11 is connected to the cathode of a diode _D1 . And the input terminal 11k of the control unit 11
and ground is the door switch 31 on the driver's side.
R and the passenger seat side door switch 31L are connected, and the input terminal 11k of the control unit 11 is connected to the cathode of a diode _D2 . The above four door switches 31R, 31L, 32
R and 32L are doors 15R, 15L, 20 respectively
Turns on when R and 20L are opened, and turns off when closed. Remaining input terminal 11 of control unit 11
A trunk switch 33, a bonnet switch 34, an inclination sensor 35, and an option switch 36 are connected between 1, 11m, 11n, and 11o and the ground, respectively. Here, the relationship between the on/off states of the switches described above and the states of the members to which these switches are attached is as shown in the following table.

【table】

[Table] On the other hand, between the output terminal _11p2 of the control unit 11 and the power line lB connected to the positive terminal of the battery B through the fuse _F3 , this anti-theft system for automobiles A mode lamp M is connected to the system for confirming the operating status of the system by sequentially lighting or blinking during the process of setting the system to a standby state in which an alarm is generated when 15R or the like is opened. Output terminal 11 of the control unit 11
A drive coil X ₁ of the starter cut relay 38 is connected between q and the power line lB.
The starter cutoff relay 38 is a relay that cuts off the power supply to the starter solenoid 39 when the above-mentioned alarm occurs, so that the engine of the automobile 14 cannot be started. One end of the normally closed contact X ₁ -b of the starter cut relay 38 is connected to the starter terminal ST of the ignition switch 12. Furthermore, if the automobile 14 is equipped with an automobile transmission (not shown), an inhibitor switch 41 and a starter solenoid 39 are connected in series between the other end of this normally closed contact X ₁ -b and the ground. connected to. The above inhibitor switch 41
is turned on when the shift lever of the automobile 14 is in the N (neutral) or P (parking) range, and the engine can only be started in this N or P range. Output terminal 11 of the control unit 11
A horn switch 42 is connected between r and ground, while the output terminal 11r and the power line
Between lB and drive coil X ₂ of horn relay 43
and fuse _F4 are connected in series. One end of the normally open contact X ₂ -a of the horn relay 43 is connected to the power line lB through a fuse F ₄ , and the horns 44 and 45 are connected between the other end of the normally open contact X ₂ -a of the horn relay 43 and the ground. are connected in parallel. Output terminal 11 of the control unit 11
A turn signal lamp 5 is connected between s and ground.
1, 52, and 53 are connected, and a contact 55 of a hazard switch 54 and a flasher 56 are connected in series between the output terminal 11s and the power line IB. Output terminal 11 of the control unit 11
A turn signal lamp 5 is connected between t and ground.
7, 58 and 59 are connected. Output terminal 11 of the control unit 11
A normally closed contact X3-b of the relay 61 is connected between the output terminal 11t and the output terminal 11t.
s is connected to the left turn side fixed contact 62L of the direction indicating combination switch 62, and is also connected to the output terminal 11.
t is connected to the right-turn side fixed contact 62R of the combination switch 62. Combi switch 6 above
A normally open contact X ₄ -a of the relay 63 is connected between the second movable contact 62c and the flasher 56. Relay 63 drive coil X ₄ and relay 61
The driving coils X ₃ each have one end connected to the ignition terminal IG of the ignition switch 12.
1, and each other end is connected to ground through another contact 64 of the hazard switch 54. In addition, in FIG. 1, 65 and 66 are room lamps, 67 is a room lamp switch, and 6
8 is an alternator, control unit 11
The ground terminal 11w is connected to the ground. Next, the operation of the automobile theft prevention system described above will be explained based on the flowcharts shown in FIGS. 4, 5, and 6. The anti-theft system for an automobile shown in FIG. 1 starts from a state before the driver's side door 15R or the passenger's side door 15L of the automobile 14 is keylessly locked, and after a predetermined period of time, the door 15R or 15L is keylessly locked. It enters a standby state and performs the following operations (a) to (g) from mode zero to mode 6 until the alarm state or alarm state is cancelled. (a) Mode zero is the operation when the key is inserted into the ignition switch 12,
Steps from the start of step 1000 in Figure 4
After label initialization in 1001, step 1002,
This is done by executing steps 1003, 1004 and 1005. (b) In mode 1, the key is removed from the ignition switch 12, but the key is still on the driver's side door 15.
This is an operation when R or the passenger side door 15L is not opened, and in mode 1, the mode lamp M lights up for 30 seconds, and mode 1
Indicates the status. Mode 1 includes steps 1002, 1003, 1006, 1007, 1008 in FIG.
This is done by executing steps 1009, 1010 and 1011. (c) In mode 2, the key is removed from the ignition switch 12, the driver's side door 15R or the passenger's side door 15L is opened, and the other doors 20R, 20L, bonnet 30 (see Figure 2) or This is an operation when any of the trunks 17 is opened, and in mode 2, the mode lamp M lights up for 30 seconds. In mode 2, steps 1002, 1003, 1006 in FIG.
Execute steps 1012, 1013, steps 1014, 1015,
This is done by executing steps 901, 902 and 903 after executing either 1016 or 1017. (d) In mode 3, the key is removed from the ignition switch 12, either the driver's side door 15R or the passenger's side door 15L is open, and the other doors 20R, 20L, trunk 17 and bonnet 30 are opened. is also closed, and lock link switches 19R, 19L, 21R, 21 of all doors 15R, 15L, 20R, 20L are closed.
This is an operation when L is off, and in mode 3, mode lamp M lights up for 30 seconds. In mode 3, steps 1002, 1003, 1006 in FIG.
This is done by executing steps 1012, 1013, 1014, 1016, 1017, 1018, 1019 and 1020. (e) Mode 4 is the operation before entering the alarm standby state when either the driver's side door 15R or the passenger's side door 15L is keyless locked, and in mode 4, the mode lamp M lights up for 30 seconds. do. Mode 4 is step 1002 in FIG.
This is done by executing steps 1003, 1006 to 1011, and steps 1021 to 1032. Furthermore, when it is determined that the count is over in step 1025, bonnet 30, doors 15R, 15
If either L, 20R, 20L or the trunk 17 is opened, or if the option switch 36 is turned on, the process returns to subroutine 1002 and continues in mode 4. (f) Mode 5 is standby mode operation, and the mode lamp M blinks 6 times at 1.5 second intervals. Mode 5 is the steps 2001 to 2014, 2026 in Figure 5,
This is done by running 2016, 2017, 2032. (g) Mode 6 is the operation when the alarm condition is activated and the alarm condition is canceled. Mode 6 is step 3001 in Figure 6.
This is done by executing 3013 from Next, the operation of the automobile anti-theft system shown in FIG. 1 will be explained in order from mode 0 to mode 6. (a) Mode zero When the engine of the automobile 14 (see Fig. 2) is running or the key is inserted into the ignition switch 12, the control unit 11 (see Fig. 1) operates as shown in Fig. 4. 1000 steps,
After executing step 1001, a subroutine for checking the status of each related switch is executed in step 1002, and it is determined in step 1003 whether the keyless switch 13 is on. If the key is inserted into the ignition switch 12, in step 1004, the key switch 13 is set to be off and the driver's side door switch 31R and the passenger's side door switch 31L have never been turned on. (TJCNT←0), at step 1005,
Set the mode to zero (MODE←0). Thereafter, steps 1002, 1003, 1004 and 1005 are executed repeatedly. (b) Mode 1 When the key is removed from the ignition switch 12 in the state of mode 0, the control unit 11 executes step 1006, and the door switch 31R of the driver's side door 15R and the door switch 31R of the passenger's side door 15L are turned on. It is determined whether the door switch 31L is on or off (whether the doors 15R and 15L are open or closed), and if the doors 15R and 15L are closed, it is determined in step 1007 whether or not the mode is currently 4. do. At this point, the mode is zero, so the control unit 11 executes step 1008 and further determines whether the current mode is one. Since the mode is zero at this point, the control unit 11 executes step 1009,
After setting the mode to 1 (MODE←1), turn on the mode lamp M for 30 seconds (SET30). In step 1011, the control unit 11
Keyless switch 13 is off and door switch 31 is off.
R or 31L turned on (TJCNT=
1) Determine whether there is a problem. At this time
Since TJCNT=0, the control unit 11 returns from subroutine 1002 to step 1003.
Steps 1006, 1007, and 1008 are executed, but since the mode is set to 1 at this time, step 1011 is executed next. After that, step from subroutine 1002.
Repeat steps 1003, 1006, 1007, 1008 and 1011. (c) Mode 2 In the state of Mode 1, the door 15 on the driver's side
When the R or passenger side door 15L is opened and the door switch 31R or 31L is turned on, the control unit 11 executes steps 1006 to 1012. Door switch 31L for side door 15L
After executing the set that the door switch 31R or 31L is turned on (TJCNT←1), in step 1013, it is necessary to determine whether the door switch 31R or 31L is off and the lock link switch 19R is turned on for 4 seconds (FKCNT←0).
and set. The control unit 11 then executes the determinations in steps 1014 to 1017, turning on/off the key switches 32R and 32L for seats other than the front seats, turning on/off the trunk switch 33, and turning on/off the trunk switch 33.
Turning the bonnet switch 34 on and off, and turning on the rear lock link switches 21R and 21L,
Determine off. When at least one of these switches is on, control unit 1
1, it is determined in step 901 whether or not mode 2 is currently selected. At this point, the mode is 1, so the control unit 11 executes step 902 and sets the mode to 2 (MODE←
2) After that, in step 903, set the mode lamp M to 30
Lights up for seconds. The control unit steps from subroutine 1002 at the next timing.
Run 1003, 1006, 1012, 1013, 1004 or
After executing step 1007, step 901 is executed and the process returns to subroutine 1002, after which this loop is repeatedly executed. (d) Mode 3 In the above condition, door switch 3 for seats other than the front seats
2R, 32L are off, trunk switch 33 is off, bonnet switch 34 is off, all lock link switches 19R, 19L, 21R,
In other words, all doors 20R, 20L, trunk 17 and bonnet 30 other than the front seats are closed, and all lock link switches 19R, 19L, 21R, 2 are turned off.
When 1L is turned off, control unit 11
In step 1019, the mode is set to 3 (MODE←3), and in step 1020, the mode lamp M is turned on for 30 seconds. Next, subroutine 1002, steps 1003, 1006, and steps 1012 to 1018 are executed, but at this point, the mode is 3, and the process returns to subroutine 1002 from step 1018. After that, subroutine 1002, steps 1003, 1006
And steps 1012 to 1018 are executed repeatedly. (e) Mode 4, then in the state of mode 3, either the driver's side door 15R or the passenger's side door 15L is closed, and the other is keyless locked (if one is opened, Even if the other one is keyless locked, it remains in mode 3), that is, the keyless switch 13 is turned off,
When the door switch 31R and the door switch 31L are turned off, the control unit 11 determines in step 1007 whether the current mode is 4 or not. Since the mode is 3 at this point, the control unit 11 determines whether the mode is 1 in step 1008, temporarily sets the mode to 1 in step 1009, and executes step 1010 again. do. Thereafter, in step 1011, the control unit 11 determines that the keyless switch 13 is off and the door switch 31R or 31L is on (TJCNT=1), that is, the key is pulled out from the ignition switch 12. Driver side door 15R or passenger side door 15L
Determine whether the has ever been opened. At this point, the key has been removed from the ignition switch 12 and the driver's side door 15R or the passenger's side door 15L has been opened, so the control unit 11 executes step 1021 and It is determined whether the front lock link switch 19R of the door 15R and the front lock link switch 19L of the passenger side door 15L are off. At this time, either the driver's side door 15R or the passenger's side door 15L is locked and the other is keyless locked, so the front lock link switches 19R and 19L are locked.
is off and control unit 11 is in step
At step 1022, it is determined whether the mode is currently 4, but at this point the mode is set to 1, so at step 1023, the door 15R on the driver's side
After starting a standby grace count that defines the time from keyless lock to entering the standby state, the mode is set to 4 in step 1024, and the process returns to subroutine 1002, although specific illustrations and explanations are not provided. When returning to subroutine 1002, the mode lamp M is turned on for 30 seconds. In step 1025, the control unit 11 determines whether the count started above has counted up. Since the count is not up at this point, the control unit 11 starts another count in step 1034, returns to subroutine 1002, and executes steps 1003, 1006, and 1007. At this point, the mode is 4, so next step 1021,
After executing steps 1022, 1025, and 1034, the process returns to step 1002. Thereafter, the control unit 11 repeats the above operations until the count started at step 1023 counts up. When the standby grace period has elapsed and the count has counted up, the control unit 11 sequentially executes steps 1026, 1027, 1028 and 1029, and switches the bonnet switch 34, the option switch 36, and the door switches 32R and 32 for seats other than the front seats.
2L and trunk switch 33 are off. These bonnet switches 3
4, option switch 36, door switch 32
If at least one of R, 32L, and trunk switch 33 is on, the control unit 11 starts another count again in step 1034, returns to subroutine 1002, and repeats the above operation. If the trunk switch 33 is on at this time, the control unit 11 sets the count up after 30 seconds have elapsed in step 1033, and then starts another count in step 1034. In this state, the bonnet switch 34,
Option switch 36, door switch 32R,
32L and the trunk switch 33 are all turned off, the above-mentioned another count that has been repeatedly started is started, and the control unit 11 determines in step 1030 whether or not this count has counted up. do. This count increases in about 1.5 seconds from the start of counting to the end of counting. Therefore, the bonnet 30, doors 20R, 20L and trunk 1
If any of the 7 etc. is closed but not completely closed and is opened again, the above-mentioned counting is restarted and the count is not increased. In other words, due to incomplete closing of the bonnet 30, doors 20R, 20L, trunk 17, etc.
Entering a standby state is prevented. When the above-mentioned one more count has counted up, the control unit 11 executes step 1031, and in step 1035, the control unit 11 executes the step described below.
It is determined whether or not the 30 second count executed in 2025 and 2027 is in progress (TKCNT=1). At this point, TKCNT=1, so
The control unit 11 executes step 1032 and switches the door switches 31R, 31L, 32R, 32
L is off, lock link switch 19R, 19
It is determined whether it is unnecessary to determine whether L, 21R, and 21L are in the off state for 4 seconds (FKCNT=1). If TKCNT=1, the control unit 11 executes step 1035 to determine the 30 second count. (f) Mode 5 If FKCNT is not 1, a 3-minute count is started in step 2001, as shown in FIG. This is to prevent the alarm from entering the alarm state if a child or the like remains inside the vehicle 14 and the inner lock knob 29 is carelessly operated. When 30 seconds have passed with TKCNT=1 and
When FKCNT=1, this 3-minute count is not started. Thereafter, in step 2002, the control unit 11 sets the mode to 5 (MODE←5), turns on the mode lamp M for 30 seconds, turns off the door switches 31R, 31L, 32R, and 32L, and turns off the lock link switches 19R and 19L in step 2003. ,2
It is set that it is necessary to judge the off state of 0R and 20L for 4 seconds (FKCNT←0), and further, in step 2004, the inclination sensor 35 at the parking position of the car 14 is set.
The initial value of the tilt sensor 35 is stored or the initial position of the tilt sensor 35 is set (tilt sensor set). The control unit 11 has a subroutine
In 2005, door switch 31R, 3 of car 14
1L, 32R, 32L, bonnet switch 32
The outputs of all the switches and inclination sensors 35 already explained, that is, the outputs of each sensor are read, and in the following steps 2006 to 2020, it is determined whether or not abnormal signals are being output from these sensors. do. That is, the control unit 11 performs steps 2006 to 2020 of the above steps 2006 to 2020.
In 2008, tilt sensor 35, door switch 3
If it is determined that any one of 1R, 31L, 32R, 32L or the bonnet switch 34 is on, the system enters an alarm state, which will be described later, regardless of whether it has been within three minutes since entering the standby state. Moreover, the control unit 11
In 2009, if it is determined that the input terminal 11a is on, if the keyless switch 13 is off and an attempt is made to start the engine without using a normal key, a warning state will occur; if the keyless switch 13 is on, i.e. If a normal key is used to start the engine, the process returns to label initialization (subroutine 1001) in FIG. 4 again. The control unit 11 also enters the alarm state when it is determined in step 2010 that the option switch 36 is on. The above steps 2009 and 2010 are also executed regardless of whether it has been within three minutes since entering the standby state. The control unit 11 performs the steps described above.
After running 2010, inner lock switch 21R, 2
It is determined whether 1L, 23R, and 23L are on or off, that is, whether or not the inner lock knob 29 is operated to the unlock position. If the inner lock knob 29 is moved to the unlock position due to careless operation by a child left in the vehicle, etc., in step 2023 T ₃ seconds count is started, and then in step 2024 the 3-second count has already been reached in step 2001. It is determined whether the 3-minute count that has started counting has increased (whether 3 minutes have elapsed since entering the standby state). If it is within three minutes of entering the standby state, that is, if the inner lock knob 29 is inadvertently operated to the unlock position by a child or the like who remains inside the keyless locked automobile 14, within three minutes of entering the standby state. In this case, the control unit 11 sets FKCNT to 1 in step 2028 (FKCNT←1), sets the mode to 4 again in step 2029, and unsets the tilt sensor 35 in step 2030. Return to subroutine 1002. Thereafter, the control unit 11 will repeatedly execute a loop from this subroutine 1002 to steps 1003, 1006, 1007, 1021, 1022, 1025 to 1032, 2002 to 2011, 2023, and 2024 within three minutes after entering the standby state. When the inner lock knob 29 is operated, either the front lock link switches 19R, 19L or the rear lock link switches 21R, 21L are turned on after a slight delay, and the control unit 11 executes steps 1003, 1006, 1007, 1021, and 1036 from subroutine 1002. The loop of execution and return to subroutine 1002 is repeated. During execution of this loop, when the inner lock knob 29 is returned to the lock position and the front lock link switches 19R, 19L or the rear lock link switches 21R, 21L are turned off, the control unit 11 returns to subroutine 1002.
1003, 1006, 1007, 1021, 1022, 1025 or
1032, 2002 to 2014, 2026, 2016, 2017, 2032
Execute and return to subroutine 2005. Thereafter, the control unit 11 repeatedly executes a loop from subroutine 2005, steps 2006 to 2014, 2026, 2016, 2017, and 2032, returning to subroutine 2005, and enters a standby state. At step 2023 above, a count of T ₃ seconds is started, but if the operating time of the inner lock knob 29 is extremely short, the inner lock switch 2
After 2R, 22L, 23R or 23L is turned off, turn the front lock link switch 19R, 19
L or rear lock link switch 21R, 2
This is to prevent any of the 1L from turning on late and immediately entering an alarm state. That is, when the standby state is within 3 minutes, the inner lock switch 22R, 22L, 23R or 23
Even if L is turned on, the control unit 11 executes steps 2012 to 2024, 2028 or 2030 while counting for ₃ seconds, returns to subroutine 1002, and continues to step 3.
1003, 1006, 1007, 1021, 1022, 1025 or
The loops 1032, 2002 to 2012, 2024, 2028 to 2032 are repeatedly executed, and during that time either the front lock link switches 19R, 19L or the rear lock link switches 21R, 21L are turned on. When either the front lock link switches 19R, 19L or the rear lock link switches 21R, 21L are turned on, the control unit 11 moves from subroutine 1002 to steps 1003, 1006, 1007, and so on.
A loop of executing steps 1021 and 1036 and returning to subroutine 1002 is repeatedly executed. After 3 minutes of waiting, the car 14
Unless the doors 15R, 15L, 20R, 20L or the trunk 17 of the vehicle are illegally opened, the control unit 11 executes the subroutine
2005, Step 2006 to 2014, 2026, 2016,
From 2017 and 2032, the loop returning to subroutine 2005 is repeatedly executed, and a virtual standby state is entered. During this waiting period, if any of the tilt sensor 35, door switches 31R, 31L, 32R, 32L, bonnet switch 34, or option switch 36 is turned on, or if the ignition switch 12 is turned on and the keyless switch 13 is turned off. In both cases, an alarm state will occur, which will be described later. Also, when the trunk key cylinder switch 18 of the trunk 17 is off and the trunk switch 33 is on, and the T ₁ second count has increased,
An alarm state will occur, which will be described later. This T ₁ second count is
This is to prevent an alarm from being erroneously generated when the trunk 17 is opened due to irregularities in the assembly of the trunk key cylinder switch 18 and trunk switch 33. That is, if the trunk switch 33 is turned on even though the trunk key cylinder switch 18 is turned off, the control unit 11 does not immediately set the alarm state, but turns on these trunk key cylinders after T ₁ seconds have elapsed. The status of the switch 18 and the trunk switch 33 is determined, and if the trunk key cylinder switch 18 is off and the trunk switch 33 is on even after T ₁ second has elapsed, it is assumed that the trunk 17 has been opened illegally, and an alarm is activated. shall be. On the other hand, even if the trunk switch 33 is turned on,
T Trunk key cylinder switch 18 within ₁ second
When the control unit 11 turns on, the control unit 11 returns to the execution of the subroutine 1002 in FIG.
From steps 1003, 1006, 1007, 1021, 1022,
A loop is repeated in which steps 1025 to 1029, 1033, and 1034 are executed and the process returns to subroutine 1002 again, and the standby state is released. After that, when the trunk 17 is closed, the standby state is resumed. Note that the 30 second count starts at step 2027 in trunk 17.
If there is luggage, etc. placed on top of the trunk, even if you try to open the trunk 17 by normal key operation, the trunk 17 will only open halfway and the trunk switch 33 will open.
remains off. In this case, the trunk 17 must be opened manually, but since the trunk key cylinder switch 18 has already been turned off at this time, an alarm will occur, but this is to prevent this. The door key cylinder switches 16R and 16L are both switches that are turned on only while the key is being operated, but even when the door key cylinder switches 16R and 16L are turned on by normal key operation, they can be turned on as follows. , the standby state is released. For example, when the door key cylinder switch 16R is turned on by a normal key operation, the control unit 11 starts a key cylinder timer count in step 2031. By the way, there is also a trunk key cylinder switch 18 and the above-mentioned switch 33 between the door key cylinder switch 16R and the lock link switch 19R.
Due to variations in the assembly of the two, the lock link switch 19R may be turned on after the door key cylinder switch 16R is turned on, or it may be turned on before the door key cylinder switch 16R is turned on. There are cases where it is done. The operations in these two cases will be explained below. [When the door key cylinder switch is turned on first] If the lock link switch 19R is turned on after the door key cylinder switch 16R is turned on, the control unit 11 performs step 2016.
After executing step 2031 and starting the key cylinder timer count, it is determined in step 2017 that the lock link switch 19R is off, and the process returns to execution of subroutine 2005 from step 2032. Thereafter, when the lock link switch 19R is turned on, the control unit 11
In 2018, the key cylinder timer up count that has started counting above is determined. Normally, the lock link switch 19R is turned on when the door key cylinder switch 16R is turned on, but at least the lock link switch 19R is turned on after the door key cylinder switch 16R is turned off and before the timer comes up, so the control unit 11 assumes that the door lock has been normally released, and returns to the subroutine 1001 of FIG. 4 with the key cylinder timer up and the lock link timer up in step 2021, and the standby state is released. [When the lock link switch is turned on first] If the lock link switch 19R is turned on before the door key cylinder switch 16R is turned on, the control unit 11 executes steps 2016 to 2017, and the lock link switch 19R is turned on. After determining that
, it is determined whether the key cylinder timer is up or not. In this case, since the key cylinder timer count has not normally started, the control unit 11 determines that the key cylinder timer has timed up, executes steps 2019 and 2033, and then returns to subroutine 2005. Then subroutine 2005 continues until the lock link timer is up.
A loop that returns to subroutine 2005 from 2006 to 2014, 2026 to 2019, and 2033 is repeatedly executed. Lock link switch 19 with normal key operation
When R is turned on, the door key cylinder switch 16 is turned on due to variations in assembly between the door key cylinder switch 16R and the lock link switch 19R.
Even if there is a delay in turning on R, the door key cylinder switch 16R is turned on before the lock link timer is timed up, and the control unit 11 is turned on.
executes step 2021, returns to subroutine 1001 in FIG. 4, and is released from the standby state. Further, if the door key cylinder switch 16R is not turned on before the lock link timer is up, it means that the key operation is not performed normally, and in this case, an alarm state occurs. Note that the standby device state is canceled by the door key cylinder switch 16L in the same manner as described above. (g) Mode 6 When any of the situations in which an alarm should be issued as described above occurs from the state of Mode 5, the control unit 11 starts counting for 3 minutes, which is the alarm duration, in step 3001 of FIG. In step 3002, the mode is set to 6 and the mode lamp M is blinked for 30 seconds at the same time. Next, in step 3003, the control unit 11 outputs a "low" level signal from its output terminal 11q, energizes the solenoid _X1 of the starter cut relay 38 shown in FIG. 1, and closes its normally closed contact X. ₁ Turn off -b to prevent the engine from starting. Further, in step 3004, the control unit 11 outputs a "low" level signal from the optional output terminal 11u. If an alarm device (not shown) consisting of, for example, a sound synthesis device is connected between the output terminal 11u of this option and the power line lB, it is possible to issue an alarm that the automobile 14 is stolen. . Next, in step 3005, the control unit 11 determines whether or not the 3-minute count has increased. If the 3-minute count has not increased, the control unit 11 periodically changes the output of the output terminal 11r in step 3006. "Low" level and "High" level,
The drive coil X ₂ of the horn relay 43 shown in FIG. 1 is energized and deenergized at the above-mentioned intervals, and the horns 44 and 45 intermittently generate an alarm sound. At the same time, in step 3007, the control unit 11 periodically sets the outputs of its output terminals 11s and 11t to a "low" level and a "high" level, so that the turn signal lamps 51, 52,
53, 57, 58 and 59 blink. The control unit 11 has a subroutine
Door key cylinder switch 16L, 16 in 3008
R, keyless switch 13 and input terminal 11a
Then, in step 3009, the door key cylinder switch 16R,
16L is turned on and off, and the keyless switch 13 is turned on and off in step 3010.
At step 3011, it is determined whether the input terminal 11a is on or off. That is, the door key cylinder switch 16R,
16L is off and the keyless switch 13 is off, or the door key cylinder switch 16R,
16L is off, the keyless switch 13 is on, and the input terminal 11a is off, the alarm operation is performed until the 3-minute count increases. Even during the above alarm operation, if the door key cylinder switches 16R and 16L are turned on, or if the keyless switch 13 and input terminal 11a are turned on, the control unit 11
The process returns to subroutine 1001 in FIG. 4, and the alarm state is canceled. Further, if the 3 minute count has increased, the control unit 11 at step 3012
The energization of the drive coil _X2 of the horn relay 43 is stopped, and then, in step 3013, the blinking of the turn signal lamps 51, 52, 53, 57, 58 and 59 is stopped, and the alarm operation is stopped. Incidentally, the starter cut relay 38 continues to be turned on and a "low" level signal continues to be output from the optional output terminal 11a. During the operation of the automobile anti-theft system described above, the control unit 11 is supplied with a voltage obtained by stabilizing the output voltage of the battery B from the power supply circuit 70. The Darlint-connected large current transistor Q ₁ and small current transistor Q ₂ of this power supply circuit 70 each have a current amplification factor of
When h _FE1 and h _FE2 are assumed, they function as one transistor having a current amplification factor of h _FE1 ×h _FE2 . Therefore, from the first equation already explained in FIG.
The maximum current flowing through the Zener diode D ₂ may be I _Lnax /h _FE1 ×h _FE2 + α (2). As is clear from comparing the second equation with the _first equation, in the _power supply circuit 70 of _FIG . can be set to 1/h _FE2 . Generally, the current amplification factor of a large transistor has a value of several 10s to several 100s, so
In this invention, the so-called waste current of the power supply of the vehicle anti-theft system is reduced to several tenths to several hundred times of the conventional power supply.
1, and it is possible to prevent battery B from rising.

[Brief explanation of drawings]

Fig. 1 is a specific circuit diagram of an automobile theft prevention system to which the present invention is applied, Fig. 2 is an explanatory diagram of the mounting positions of various sensors, and Fig. 3 is a diagram showing the installation positions of the door key cylinder switch, inner lock switch, and lock link switch. 4, 5 and 6 are flowcharts for explaining the operation of the automobile anti-theft system shown in FIG. 1, and FIG. FIG. 1 is an explanatory diagram of a power supply portion of a conventional vehicle anti-theft control circuit. 11...Control unit, 70...Power supply circuit, B...Battery, Q1...Transistor for large current, Q2...Transistor for small current, D2...
...Zener diode, R1...resistance.

Claims (1)

[Scope of utility model registration request] A vehicle anti-theft control circuit that is powered and activated when the vehicle is stopped includes a power supply circuit consisting of a Zener diode, a resistor that supplies current to the Zener diode, a small current transistor, and a large current transistor. , one end of the above resistor is connected to the vehicle battery, and the other end is connected to the cathode of a Zener diode, the cathode of the Zener diode is connected to the other end of the resistor, and the anode is connected to ground, and for the small current. The collector of the transistor is connected to the battery, the base is connected between the Zener diode and the resistor, and the emitter is connected to the base of the high current transistor, and the collector of the high current transistor is connected to the battery. A control circuit for preventing theft of a vehicle, characterized in that the output voltage of the power supply circuit is taken out between the emitter and ground.