JP3257195B2 - Vehicle anti-theft device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle antitheft device for preventing theft caused by improper operation of a vehicle.

[0002]

2. Description of the Related Art A vehicle antitheft device for preventing theft caused by an unauthorized operation of a vehicle stops a fuel pump when an unauthorized operation is detected (Japanese Patent Application Laid-Open No. 63-2551).
No. 55) and the like are known. FIG. 6 is a block diagram showing a configuration of an example of a conventional vehicle anti-theft device that stops a fuel pump when an illegal operation is detected. Here 2
An example of a vehicle with a door is shown. When the vehicle anti-theft device detects an operation procedure different from a normal operation procedure for the vehicle, it immediately stops the fuel pump to stop the fuel sent to the engine. Hereinafter, the operation of the vehicle antitheft device will be described with reference to time charts shown in FIGS. 7A to 7I and a flowchart shown in FIG. When the ignition switch 50 is off (FIG. 7A, S80), both the driver's seat and the passenger's seat door are closed and locked, that is, the door open / close detection switch 54a for the driver's seat and the passenger's seat. , 55a detect that the door is closed (switch off) (FIG. 7D,
(B)), door lock detection switches 5 for the driver's seat and the passenger's seat
When both of 6b and 57b are in the state of detecting (switching off) the door lock (FIGS. 7E and 7C) (S81), the microcomputer 58 sends these detection signals to the input interface circuit. Received through 53,
An alert flag is set (FIG. 7F, S82), and the vehicle anti-theft device is set to an alert state. Here, since the anti-theft controller 3 including the microcomputer 58 and the input interface circuit 53 is supplied with power from the power supply circuit 52 directly connected to the battery 51, the microcomputer 58, the input interface circuit 53
And the like are always in operation regardless of whether the ignition switch 50 is on or off.

[0003] In the above alert state, when the driver's seat door is opened without unlocking the driver's door by using a wire or the like, for example, the driver's seat and the passenger's seat door are opened. While both of the lock detection switches 56b and 57b detect the door lock (switch off), the door open / close detection switch 54a of the driver's seat detects the opening of the door (switch on) (FIG. 7D, When detecting an unjust operation procedure such as S83), the microcomputer 58 recognizes that the vehicle is stolen. Then, an alarm flag is set (FIG. 7 (g), S84), the vehicle anti-theft device is shifted to an alarm state, and a drive circuit 59 for driving the alarm device 61 and the like is used to drive a buzzer, an indicator lamp, and the like. The alarm device 61 is activated (S85) to issue an alarm, and the fuel cut relay Ry1 is activated (S8).
6) Turn off the contact Ry1b. In such a state, even if the ignition switch 50 is turned on by a method such as a short circuit (FIG. 7A), the engine control device 62 is activated, and the ignition relay Ry2 is activated to turn on the contact Ry2a. Since the contact Ry1b is off, the fuel pump motor 60 does not operate (FIG. 7 (h), S87). Therefore, a fuel pump (not shown)
Does not work, and no fuel is sent to the engine (not shown) (FIG. 7 (i)), so that the engine does not start and the vehicle cannot run.

[0004]

However, in such a vehicle anti-theft device, a malfunction occurs during traveling,
In the case of an alarm condition, the engine is suddenly stopped, and there is a problem in safety such as a possibility of collision, and a problem in reliability. The present invention has been made in view of such circumstances, and by providing the fuel gradual decrease signal control means, even if it malfunctions during traveling, there is no possibility that the engine will suddenly stop, and the switching unit is By using a non-contact switching element, it is possible to provide a highly reliable and gradually decreasing fuel stopping means for adjusting a decreasing rate per unit time for gradually decreasing the amount of fuel sent to the engine according to the traveling speed. It is an object of the present invention to provide a vehicle antitheft device having high reliability.

[0005]

A vehicle anti-theft device according to a first aspect of the present invention is a vehicle anti-theft device for preventing theft caused by an improper operation of the vehicle. Theft detecting means for detecting an operating procedure different from the operating procedure of the vehicle, and when the theft detecting means detects an operating procedure different from a normal operating procedure for the vehicle, the rotation of the fuel pump motor is gradually limited to the switching unit. a fuel decreasing signal control means for outputting a fuel pump motor control signal for stopping gradually decelerate the vehicle by, e
Condition where fuel sent to the engine is gradually reduced or stopped.
And a display unit for displaying a stopped state . The vehicle antitheft device according to the second invention has a first
In the vehicle theft prevention device according to the invention, the fuel gradual decrease signal control means adjusts a decrease rate per unit time for gradually decreasing the fuel sent to the engine according to the vehicle speed information from the vehicle speed sensor. Features.

[0006]

In the vehicle antitheft device according to the first invention, when the theft detection means detects an operation procedure different from a normal operation procedure for the vehicle, the fuel gradual decrease signal control means causes the switching unit to rotate the fuel pump motor. A fuel pump motor control signal for gradually restricting and stopping the fuel pump motor, and the switching unit drives and controls the fuel pump motor by a switching operation according to the fuel pump motor control signal to gradually reduce the fuel sent to the engine and finally The vehicle is gradually decelerated, finally stopped , and sent to the engine.
State where fuel is gradually reduced or stopped
Is displayed, so that these two states
Sometimes let the driver know what's going on with the vehicle
Can be In the vehicle theft prevention device according to the second invention, the fuel gradual decrease stop means controls the drive of the fuel pump motor in accordance with the vehicle speed information from the vehicle speed sensor, and when the vehicle is stopped, the fuel sent to the engine is stopped. Is stopped immediately to prohibit the running of the vehicle, and at higher speeds, the reduction rate per unit time for gradually decreasing the fuel sent to the engine is reduced, and the vehicle is stopped in a mode corresponding to the vehicle speed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing embodiments thereof. FIG. 1 is a block diagram showing a configuration of an embodiment of a vehicle anti-theft device according to the first, second and third inventions. The anode of the battery 51 is connected to the power supply circuit 52 of the anti-theft controller 1 via the + B terminal of the anti-theft controller 1, while the ignition switch 5
0 is connected to the IG terminal of the anti-theft controller 1. In the anti-theft controller 1 from the IG terminal, the signal is an on / off signal line of the ignition switch 50 and is connected to the microcomputer 11 via the input interface circuit 10. Also, I
The G terminal is connected to an engine control device 62 via an ignition relay Ry2.
When 0 is on, the ignition relay Ry2 and the engine control device 62 are activated.

[0008] Door open / close detection switch 5 for driver's seat and passenger's seat
One end of each of the door lock detection switches 56b, 57b of the driver seat and the passenger seat is separately connected to the input interface circuit 10, and the other end is grounded. The input interface circuit 10 and the microcomputer 11 are connected by signal lines arranged for each of the door open / close detection switches 54a and 55a and the door lock detection switches 56b and 57b, and from the microcomputer 11 via the drive circuit 12, A signal line for issuing an alarm to an alarm device 61 such as a buzzer or a display lamp is connected. The microcomputer 11 is connected to the base of an npn transistor 14 for driving and controlling the fuel pump motor 60, and another pnp transistor 15 is connected to the transistor 14 by Darlington connection. The transistor 15 has an emitter terminal connected to the IG terminal of the anti-theft controller 1 via a contact Ry2a of the ignition relay Ry2, a collector terminal connected to an anode of the fuel pump motor 60, and a cathode of the fuel pump motor 60 grounded. Have been. The indicator light 13 is an LED or the like. In the case of an LED, the anode is connected to the + B terminal of the anti-theft controller 1, and the cathode is connected to the microcomputer 11 via the drive circuit 12. The indicator light 13 is provided at a position visible to the driver, such as a dashboard of a vehicle.

Hereinafter, the operation of the vehicle antitheft device having such a configuration will be described with reference to time charts shown in FIGS. 2 (a) to 2 (i) and a flowchart shown in FIG. Since the anti-theft controller 1 composed of the microcomputer 11 and the input interface circuit 10 is supplied with power from the power supply circuit 52 directly connected to the battery 51, the microcomputer 11, the input interface circuit 10 and the like It is always in operation regardless of whether the switch is on or off. Also IG
When turned off, the microcomputer 11 may be stopped to reduce power consumption. During normal operation, the microcomputer 11 keeps the duty ratio of the fuel pump motor control signal constant or keeps Vo constant at Hi. When the ignition switch 50 is off (FIG. 2A, S10), both the driver's seat and the passenger's seat are closed and locked, that is,
Driver opening / closing detection switches 54a, 55a for the driver's seat and the passenger's seat
Both detect that the door is closed (switch off) (see FIG. 2).
(D), (b)), both the driver's seat and the passenger's seat door lock detection switches 56b, 57b detect (switch off) the door lock (FIGS. 2 (e), 2 (c)). (S11), the microcomputer 11 receives these detection signals via the input interface circuit 10, sets an alert flag (FIG. 2 (f), S12), and sets the vehicle anti-theft device to the alert state.

In the above alert state, when the driver's seat door is opened without opening the driver's door lock by using a wire or the like, for example, the driver's seat and the passenger's seat door are opened. With both the lock detection switches 56b and 57b detecting (switching off) the door lock, the door open / close detection switch 54a in the driver's seat detects the opening of the door (FIG. 2 (d), S13). When detecting an operation procedure different from the normal operation procedure, the microcomputer 11 recognizes that the vehicle is stolen, sets an alarm flag (FIG. 2 (g), S14), and sets the vehicle anti-theft device to an alarm state. And an alarm device 61 such as a buzzer or an indicator lamp is operated via the drive circuit 12 (S1).
5) A warning is issued, and the output of the fuel pump motor control signal from the fuel pump motor control signal output terminal Vo is started (S16). Then, the duty ratio of the fuel pump motor control signal is gradually reduced (FIG. 2). (H), S1
7). At this time, the microcomputer 11 also starts blinking the indicator lamp 13 via the drive circuit 12 (S
18).

In this state, the ignition switch 50 is turned on by a method such as a short circuit (FIG. 2).
(A)) When the ignition relay Ry2 is activated and the contact Ry2a is turned on, the supply voltage of the battery 51 is applied to the emitter terminal of the transistor 15. The fuel pump motor control signal amplified by the transistor 14 is input from the microcomputer 11 to the base terminal of the transistor 15, and only when the fuel pump motor control signal is at a high level, the transistor 15 becomes conductive and the battery 51 Is supplied to the fuel pump motor 60, and the fuel pump motor 60 operates. Therefore, when the duty ratio of the fuel pump motor control signal is gradually reduced (S17), the pressure applied to the fuel by the fuel pump (not shown) decreases.
Even if the engine is started, the fuel sent to the engine decreases (FIG. 2 (i)). As a result, the engine speed gradually decreases and finally stops, so that even when the vehicle starts running, the vehicle is gradually decelerated and finally stops. The microcomputer 11 turns on the indicator lamp 13 after the duty ratio of the fuel pump motor control signal becomes a value at which the engine cannot be operated (S19) (S2).
0).

[0012] The time from when the alarm is activated to when the fuel supplied to the engine is cut off and when the vehicle is stopped, during normal driving, when an alarm is activated due to a malfunction, the engine is immediately stopped. Considering such conditions that the vehicle does not collide or slip due to abrupt engine braking, and that the vehicle runs only a distance that does not allow the vehicle to escape when the vehicle is actually stolen, it is appropriate that the time is about several tens of seconds. In the above description, a two-door vehicle has been described, but it goes without saying that the number of doors is not limited to this. Further, the degree to which the fuel sent to the engine is gradually reduced is not limited to a linear one or a curved one.

FIG. 4 is a block diagram showing the configuration of an embodiment of a vehicle anti-theft device according to the fourth invention. The difference from FIG. 1 is that a signal line is connected from a vehicle speed sensor 16 for measuring the running speed of the vehicle to a microcomputer 18 via an input interface circuit 17.
The other parts similar to those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. Hereinafter, the operation of the vehicle antitheft device having such a configuration will be described with reference to the flowchart shown in FIG. When the microcomputer 18 recognizes that the vehicle is stolen, it sets an alarm flag (S3).
4) The vehicle anti-theft device is shifted to an alarm state, and an alarm device 61 such as a buzzer or an indicator lamp is operated via the drive circuit 12 to issue an alarm (S35). At the same time, vehicle speed information indicating the running speed of the vehicle at that time is received from the vehicle speed sensor 16 via the input interface circuit 17, and when the running speed is 0, the fuel pump motor control signal output terminal Vo outputs the fuel pump motor control signal. The output of the control signal is prohibited (S41). On the other hand, when the vehicle is running, the speed of the vehicle is set to v, and the duty ratio of the fuel pump motor control signal is set to T, for example, a reduction rate obtained by ΔT = K / v (K is a negative constant), that is, When the speed is high, the reduction rate is such that the time until the vehicle stops is long, and conversely, when the speed is low, the duty ratio of the fuel pump motor control signal is a reduction rate that the time until the vehicle stops is short. The gradual decrease of the ratio is started (S37). Therefore, the vehicle is decelerated according to the traveling speed at that time, and finally stops. Other operations are the same as the operations of the vehicle anti-theft device according to the first, second, and third aspects described above, and thus description thereof is omitted.

[0014]

According to the vehicle antitheft device of the first invention, even if an alarm occurs due to a malfunction during traveling, the vehicle suddenly enters the engine stop state and is hit by a collision, or a sudden engine brake causes a slip. It is safe because there is no danger. Also sent to the engine
Fuel is gradually reduced and sent to the engine
Each time the fuel is turned off,
You can let them know what is happening,
The diver must take appropriate measures, such as evacuating the vehicle.
it can. According to the vehicle antitheft device according to the second invention,
While the vehicle is not moved due to the vehicle theft (attempt), even if it malfunctions during normal traveling, there is no danger of a sudden engine brake slip or the like, and the vehicle is safe.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a vehicle antitheft device according to first, second and third inventions.

FIGS. 2 (a), (b), (c), (d), (e),
(F), (g), (h) and (i) are time charts showing the operation of the vehicle antitheft device according to the first, second and third inventions.

FIG. 3 is a flowchart showing the operation of the vehicle antitheft device according to the first, second and third inventions;

FIG. 4 is a block diagram showing the configuration of an embodiment of a vehicle anti-theft device according to the fourth invention.

FIG. 5 is a flowchart showing the operation of the vehicle antitheft device according to the fourth invention.

FIG. 6 is a block diagram showing a configuration of an example of a conventional vehicle anti-theft device.

FIGS. 7 (a), (b), (c), (d), (e),
(F), (g), (h) and (i) are time charts showing the operation of the conventional vehicle anti-theft device.

FIG. 8 is a flowchart showing the operation of the conventional vehicle anti-theft device.

[Explanation of symbols]

 1, 2 vehicle antitheft controller 10, 17 input interface circuit 11, 18 microcomputer 12 drive circuit 13 indicator light 14, 15 transistor 16 vehicle speed sensor 50 ignition switch 51 battery 54a, 55a door open / close detection switch 56b, 57b door lock detection switch 60 Fuel pump motor Ry2 ignition relay Ry2a ignition relay contact

Claims (2)

(57) [Claims] 1. A vehicle anti-theft device for preventing theft caused by an unauthorized operation of a vehicle, comprising: a switching unit for driving and controlling a fuel pump motor; and a theft detecting means for detecting an operation procedure different from a normal operation procedure for the vehicle. When the theft detecting means detects an operation procedure different from a normal operation procedure for the vehicle, a fuel pump motor control signal for gradually restricting the rotation of the fuel pump motor to the switching section to gradually decelerate and stop the vehicle. And a state where the fuel sent to the engine is gradually reduced
Or a display unit for displaying a stopped state . 2. The fuel gradual decrease signal control means adjusts a decrease rate per unit time for gradually decreasing fuel sent to an engine according to vehicle speed information from a vehicle speed sensor. Item 4. The vehicle theft prevention device according to Item 1.