JPH09112331A - Vehicle theft preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent vehicle theft due to vehicle self-running by making an engine behavior abnormal even if a fuel cut valve control unit is removed and a fuel cut valve is replaced with an authorized one. SOLUTION: This device is provided with a control means 2 for setting fuel injection amount in an engine 21 to fuel injection amount corresponding to that at the time of full throttling when it is detected that a fuel cut control unit 12 for controlling a fuel cut valve 11 has been removed.

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.

[0002]

2. Description of the Related Art A conventional vehicle antitheft device is shown in FIG. 10, for example. In the figure, 1
Is an engine key that stores a unique code, and 14 is
Antenna for reading the code of engine key 1, 15,
A vehicle theft prevention unit, 16 is a CPU incorporated in the vehicle theft prevention unit 15, 12 is a fuel cut valve control unit (hereinafter referred to as FCV control unit), and 13 is
It is a CPU built in the FCV control unit 12, and
Is a communication line between the CPU 13 and the CPU 16. 8
Is a fuel injection pump, 9 is an electric governor built in the fuel injection pump 8, and the fuel injection amount of the fuel injection pump 8 is determined by the position of the electric governor 9. 11 is FC
Fuel cut valve equipped with V control unit 12 (hereinafter,
FCV), 19 is a fuel injection pipe, 20 is a fuel injection valve, and 21 is an engine. Further, 2 is an engine control unit, 3 is a C built in the engine control unit 2.
PU and 10 are electric governor drive transistors,
The electric governor 9 is driven according to the output signal of the CPU 3. 22 is a battery.

Then, the vehicle theft prevention unit 15 reads the code stored in the engine key 1 through the antenna 14 and collates it with the code stored in the vehicle theft prevention unit 15 in advance, and judges the result of the match / mismatch. It transmits to the FCV control unit 12 via the communication line 18. Further, the vehicle theft prevention unit 15 performs, via the communication line 18, collation of a code that is updated at the same time each time the ignition switch is switched from ON to OFF so that the code is the same as that of the FCV control unit 12. . Engine key 1
If the code of the vehicle anti-theft unit 15 does not match, the CPU 13 closes the FCV 11 by the engine stop request signal from the vehicle anti-theft unit 15, and the engine 2
Control to stop 1 is performed. If the code of the engine key 1 and the code of the vehicle antitheft unit 15 match, that is, even if the valid engine key 1 is used, if the code of the vehicle antitheft unit 15 and the code of the FCV control unit 12 do not match, the CPU 13 , FCV11 closed and engine 21
Is controlled to stop.

As described above, it is attempted to start the engine 21 by using the engine key having an illegal code, and the FCV control unit 12 is connected to the vehicle theft prevention unit 15.
When the FCV control unit with a function to cut the fuel and stop the engine 21 in response to the fuel cut request signal from the engine is replaced and the FCV control unit has an unreasonable code and the engine 21 is started to operate, The engine 21 is forcibly stopped to prevent the vehicle from being stolen.

[0005]

However, in such a conventional vehicle theft prevention device, the FCV11
Is controlled by the FCV control unit 12, and the FC is controlled based on the fuel cut request signal of the vehicle theft prevention unit 15.
If the vehicle anti-theft unit 15 sends a fuel cut request signal to the FCV control unit 12 without the function of closing V11 and stopping the engine 21, the FCV control unit 12 closes the FCV 11 and stops the engine 21. Do not do. As shown in FIG. 11, a vehicle theft prevention unit 15 is installed due to a fraudulent act for theft of the vehicle.
FCV31 that does not include the FCV control unit 12 that has the function of stopping the engine 21 based on the transmission signal of
Is used instead of the FCV 11 having the function of closing the FCV and stopping the engine 21 based on the fuel cut request signal of the vehicle theft prevention unit 15, the vehicle antitheft unit 15 sends a fuel cut request signal to the FCV 31. However, since the FCV control unit 12 is not provided, it is impossible to close the FCV 31 and stop the engine 21. Therefore, there is a problem that the engine 21 can be started, the vehicle can run on its own, and may be stolen.

The present invention has been made in view of the above conventional problems. For the purpose of vehicle theft, the FCV control unit is removed and the FCV is replaced with an improper one, and the engine is started to drive the vehicle. An object of the present invention is to provide a vehicle theft prevention device that can prevent the vehicle from being stolen due to self-propelled vehicle by making the engine behavior abnormal even when trying to do so.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a fuel cut valve control unit storing a specific code, and a fuel cut valve control unit according to a request of the fuel cut valve control unit. The fuel cut valve for controlling the cut and the code stored in the fuel cut valve control unit are collated, and if the fuel cut valve control unit is unjust, In a vehicle anti-theft device having a vehicle anti-theft unit requesting fuel cut control, when it is detected that the fuel cut valve control unit has been removed, the fuel injection amount in the engine is equivalent to that at full throttle. The gist is to have a control means for setting the injection amount. With this configuration,
For the purpose of vehicle theft, the fuel cut valve control unit was removed, and the fuel cut valve was replaced with one that can be opened directly from the battery etc. without the fuel cut valve control unit. However, because the fuel injection amount becomes excessive compared to during normal control, engine behavior becomes abnormal, traveling is difficult, and it is noticeable due to abnormal smoke emissions, so it is possible to prevent vehicle theft due to self-propelled vehicles. Become.

According to a second aspect of the present invention, in the vehicle antitheft apparatus according to the first aspect, there is provided an engine control unit which outputs a command signal for adjusting an amount of fuel injection in the engine, and the engine control unit is a communication line. The engine control unit is connected to the vehicle anti-theft unit with a full fuel injection amount regardless of the accelerator opening.
When it is detected that the fuel cut valve control unit is configured to include the fuel injection amount map for the theft control which is the fuel injection amount corresponding to the throttle and the engine control unit is configured to remove the fuel cut valve control unit. The gist is that the engine control unit is configured to be operated by switching to the fuel injection amount map for the theft control in response to a theft control request signal from the vehicle theft prevention unit. With this configuration, when it is detected that the fuel cut valve control unit has been removed, the fuel injection amount map in the engine control unit will be the same as the fuel injection amount at full throttle regardless of the accelerator opening for theft control. By switching to the fuel injection amount map of No. 1, the engine behavior becomes abnormal, and it becomes possible to more reliably prevent vehicle theft due to self-propelling of the vehicle.

According to a third aspect of the present invention, in the vehicle antitheft apparatus according to the first aspect, there is provided an engine control unit which outputs a command signal for adjusting an amount of fuel injection in the engine, and the engine control unit is a communication line. In the engine control unit, a fuel injection amount map for theft control which becomes a fuel injection amount corresponding to idling regardless of engine speed and accelerator opening is connected to the vehicle antitheft unit. The engine control unit is configured to be stored in the engine control unit, and the engine control unit is controlled by a theft control request signal from the vehicle antitheft unit when the removal of the fuel cut valve control unit is detected. It must be configured to operate by switching to the fuel injection amount map for the theft control. To. With this configuration, when it is detected that the fuel cut valve control unit has been removed,
The engine behavior becomes abnormal by switching the fuel injection amount map in the engine control unit to the fuel injection amount map for the theft control which results in the fuel injection amount corresponding to the idling regardless of the engine speed and the accelerator opening. It becomes possible to prevent vehicle theft due to self-propelled vehicle more reliably.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 are views showing a first embodiment of the present invention. In addition, in FIG. 1 and the drawings showing each embodiment to be described later, the same or equivalent components as the devices and the like in FIG. 10 are designated by the same reference numerals, and the duplicated description will be omitted.

First, the structure of the vehicle theft prevention device will be described with reference to FIG. 1. The accelerator opening detection means 4 and the engine speed detection means 5 are connected to a CPU 3 incorporated in the engine control unit 2, respectively. Reference numeral 6 denotes a fuel injection amount map for normal time control stored in the CPU 3, which is determined by the accelerator opening detected by the accelerator opening detecting means 4 and the engine speed detected by the engine speed detecting means 5. The fuel injection amount is written. 7
Is a fuel injection amount map for the theft control. A CPU 3 built in the engine control unit 2 and a CPU 16 built in the vehicle antitheft unit 15 are connected by a communication line 17.

Next, the operation of this embodiment will be described. After the ignition is turned on, first, the vehicle theft prevention unit 1
5 is an engine key 1 or an FCV control unit 12
Is verified, and if at least one of the engine key 1 and the FCV control unit 12 is invalid, the control request to the engine control unit 2 via the communication line 17 at the time of theft is requested. Send a signal. When the engine control unit 2 receives the theft control request signal, it switches the fuel injection amount map from the fuel injection amount map 6 used for the normal time control to the fuel injection amount map 7 used for the theft control. In the fuel injection amount map 6 used for the normal time control, the fuel injection amount increases as the accelerator opening increases as shown in FIG. 2, and decreases at the same accelerator opening as the engine speed increases. There is. On the other hand, in the fuel injection amount map 7 used for the theft control, as shown in FIG. 3, the fuel injection amount corresponds to the accelerator opening 100% (full throttle) regardless of the accelerator opening. The fuel injection amount is adjusted.

Therefore, even if the engine 21 is started by using an improper engine key or FCV for the purpose of stealing the vehicle due to self-propelled vehicle, the CPU 3 causes the accelerator opening degree to reach 100% (full throttle when the accelerator is depressed even a little). Output signal to the electric governor drive transistor 10 such that fuel is injected with a fuel injection amount equivalent to (throttle). The electric governor 9 uses the electric governor drive transistor 10 so that the fuel injection amount is 100 degrees or less.
Since the fuel injection amount is controlled to a position where the fuel injection amount is equivalent to%, the fuel injection pump 8 performs excessive fuel injection as compared with the normal control. The engine 21 deteriorates in drivability because the fuel injection amount becomes excessive, and the smoke concentration becomes high due to the excessive air-fuel mixture. Therefore, it is difficult to travel and is conspicuous due to abnormal smoke emission, so that it is possible to prevent the vehicle from being stolen due to self-propelled vehicle. As described above, the CPU 3 built in the engine control unit 2 constitutes a control means for setting the fuel injection amount in the engine to the fuel injection amount corresponding to the full throttle.

4 to 6 show a second embodiment of the present invention. In FIG. 4, 23 is a fuel injection amount map used for normal time control, and 24 is a fuel injection amount map used for theft control. Both maps 23, 2
4 is stored in the CPU 3.

When the engine control unit 2 receives the theft control request signal from the vehicle theft prevention unit 15,
The fuel injection amount map is switched from the fuel injection amount map 23 used for the normal control to the fuel injection amount map 24 used for the theft control. In the fuel injection amount map 23 used for the normal fuel injection amount control, as shown in FIG. 5, the fuel injection amount becomes maximum near the idling speed and decreases as the engine speed increases. Further, at the same engine speed, it increases as the accelerator opening increases. On the other hand, in the fuel injection amount map 24 used for the theft control, as shown in FIG. 6, the fuel injection amount remains at the idling fuel injection amount regardless of the engine speed and the accelerator opening. I have to.

Therefore, even if the engine 21 is started by using an improper engine key or FCV for the purpose of stealing the vehicle by self-propelled vehicle, the CPU 3 causes the fuel injection amount during idling even if the engine speed increases. The output signal for performing the fuel injection corresponding to is output to the electric governor drive transistor 10. Electric governor 9
Is controlled by the electric governor drive transistor 10 to a position where the fuel injection amount becomes the fuel injection amount at the time of idling, so that the fuel injection pump 8 performs excessive fuel injection as compared with the normal control. The engine 21 deteriorates in drivability because the fuel injection amount becomes excessive, and the smoke concentration becomes high due to the excessive air-fuel mixture. Therefore, it is difficult to travel and is conspicuous due to abnormal smoke emission, so that it is possible to prevent the vehicle from being stolen due to self-propelled vehicle.

7 to 9 show a third embodiment of the present invention. In FIG. 7, 25 is a fuel injection timing control valve (hereinafter referred to as TCV), and 26 is a TCV.
It is a driving transistor. TCV drive transistor 26
Drives the TCV 25 in accordance with the output signal of the CPU 3 to shift the fuel injection timing back and forth. 27 is a fuel injection timing map used for normal time control, and 28 is a fuel injection timing map used for theft control. Both maps 27,
28 is stored in the CPU 3.

When the engine control unit 2 receives the theft control request signal from the vehicle theft prevention unit 15,
The fuel injection timing map is switched from the fuel injection timing map 27 used for the normal time control to the fuel injection timing map 28 used for the theft control. In the fuel injection timing map 27 used for normal fuel injection timing control, as shown in FIG. 8, the fuel injection timing is advanced as the engine speed increases with reference to the vicinity of the idling speed. There is. On the other hand, in the fuel injection timing map 28 used for the theft control, as shown in FIG.
The fuel injection timing does not advance even if the engine speed increases, and remains at the fuel injection timing during idling.

Therefore, even if the engine 21 is started by using an improper engine key or FCV for the purpose of vehicle theft due to self-propelling of the vehicle, the CPU 3 causes the fuel injection timing at idling even if the engine speed increases. The output signal that remains the same is output to the TCV drive transistor 26. The TCV 25 is controlled by the TCV drive transistor 26 so that the fuel injection timing remains the fuel injection timing during idling, so the fuel injection pump 8 does not advance the fuel injection timing according to the engine speed. Inject fuel. The engine 21 causes incomplete combustion and the smoke concentration becomes high. Therefore, it is difficult to travel and is conspicuous due to abnormal smoke emission, so that it is possible to prevent the vehicle from being stolen due to self-propelled vehicle.

[0021]

As described above, according to the first aspect of the present invention, when it is detected that the fuel cut valve control unit has been removed, the fuel injection amount in the engine is the fuel corresponding to the full throttle. Since the control means for setting the injection amount is provided, the fuel cut valve control unit is removed for the purpose of vehicle theft, and the fuel cut valve is opened directly from the battery without the fuel cut valve control unit. Even if the fuel is replaced with one that can be put into a state, the amount of fuel injection will be excessive compared to during normal control, causing abnormal engine behavior, making it difficult to drive and making noticeable due to abnormal smoke emissions. It is possible to prevent vehicle theft caused by self-propelled vehicle.

According to a second aspect of the present invention, there is provided an engine control unit for outputting a fuel injection amount adjustment command signal in the engine, and the engine control unit is connected to a vehicle antitheft unit by a communication line, The engine control unit stores a fuel injection amount map for theft control for which the fuel injection amount becomes a fuel injection amount corresponding to a full throttle regardless of the accelerator opening, and the engine control unit constitutes the control means. However, the engine control unit switches to the fuel injection amount map for the theft control by the theft control request signal from the vehicle antitheft unit when it is detected that the fuel cut valve control unit is removed. Since it is configured to operate, if it is detected that the fuel cut valve control unit has been removed, The engine behavior becomes abnormal by switching the fuel injection amount map in the engine control unit to the fuel injection amount map for theft control, where the fuel injection amount corresponds to the full throttle regardless of the accelerator opening. The vehicle theft due to running can be more reliably prevented.

According to a third aspect of the present invention, there is provided an engine control unit for outputting a fuel injection amount adjustment command signal in the engine, and the engine control unit is connected to a vehicle antitheft unit by a communication line, The engine control unit stores a fuel injection amount map for theft control in which the fuel injection amount becomes a fuel injection amount corresponding to idling regardless of the engine speed and the accelerator opening degree, and the engine control unit performs the control means. Configure
The engine control unit operates by switching to the fuel injection amount map for the theft control by a theft control request signal from the vehicle antitheft unit when it is detected that the fuel cut valve control unit is removed. With this configuration, when it is detected that the fuel cut valve control unit has been removed, the fuel injection amount map in the engine control unit is stolen with the fuel injection amount corresponding to idling regardless of the engine speed and accelerator opening. By switching to the fuel injection amount map for time control, the engine behavior becomes abnormal, and the vehicle theft due to the vehicle self-propelling can be prevented more reliably.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a vehicle theft prevention device according to the present invention.

FIG. 2 is a diagram showing a fuel injection amount map for normal time control in the first embodiment.

FIG. 3 is a diagram showing a fuel injection amount map for the theft control according to the first embodiment.

FIG. 4 is a block diagram showing a second embodiment of the present invention.

FIG. 5 is a diagram showing a fuel injection amount map for normal time control in the second embodiment.

FIG. 6 is a diagram showing a fuel injection amount map for the time of theft control in the second embodiment.

FIG. 7 is a block configuration diagram showing a third embodiment of the present invention.

FIG. 8 is a diagram showing a fuel injection timing map for normal time control in the third embodiment.

FIG. 9 is a diagram showing a fuel injection timing map for the time of theft control in the third embodiment.

FIG. 10 is a block diagram showing a conventional vehicle theft prevention device.

FIG. 11 is a block diagram illustrating a problem of the conventional example.

[Explanation of symbols]

 2 Engine control unit 3 CPU (control means) built in the engine control unit 6,23 Fuel injection amount map for normal time control 7,24 Fuel injection amount map for theft control 11 Fuel cut valve 12 Fuel cut valve control unit 15 Vehicle anti-theft unit 17, 18 Communication line 21 Engine

Claims (3)

[Claims] 1. A fuel cut valve control unit that stores a specific code, a fuel cut valve that controls fuel cut according to a request from the fuel cut valve control unit, and a memory that is stored by the fuel cut valve control unit. In a vehicle anti-theft device having a vehicle anti-theft unit that checks the existing code and requests the fuel cut valve control unit to control the fuel cut when the fuel cut valve control unit is improper, A vehicle anti-theft device comprising control means for setting the fuel injection amount in the engine to a fuel injection amount corresponding to full throttle when it is detected that the fuel cut valve control unit has been removed. 2. An engine control unit for outputting a command signal for adjusting the fuel injection amount in the engine, wherein the engine control unit is connected to the vehicle antitheft unit by a communication line, and the engine control unit is provided with the fuel. The control means is configured by the engine control unit by storing a fuel injection amount map for theft control in which the injection amount becomes the fuel injection amount corresponding to the full throttle regardless of the accelerator opening, and the fuel cut valve control is performed. The engine control unit is configured to operate by switching to the fuel injection amount map for the theft control by a theft control request signal from the vehicle theft prevention unit when it is detected that the unit has been removed. The vehicle antitheft device according to claim 1, wherein: 3. An engine control unit for outputting a fuel injection amount adjustment command signal in the engine, wherein the engine control unit is connected to the vehicle antitheft unit by a communication line, and the engine control unit includes the fuel. The control means is configured by the engine control unit by storing a fuel injection amount map for theft control, in which the injection amount becomes the fuel injection amount corresponding to idling regardless of the engine speed and the accelerator opening, and the fuel cut is performed. The engine control unit is configured to operate by switching to a fuel injection amount map for the theft control by a theft control request signal from the vehicle antitheft unit when it is detected that the valve control unit has been removed. The vehicle antitheft device according to claim 1, wherein the antitheft device is a vehicle antitheft device.