JPS61271156A - Burglarproof device for vehicle - Google Patents

Abstract

PURPOSE:To prevent unnecessary warning from being given by configurating a device in such a way that a regular amount of time delay is provided for both a power source control for the device and the warning output timing due to the sensor input based on the detected condition of accessary electric voltage of a vehicle. CONSTITUTION:When a driver leaves a car with an accessary switch pulled out, that accessary voltage 'b' is turned off permits the output from a reverse circuit 2 to be turned on. Then, power source voltage 'd' is applied to both an interface circuit 5 and a delay circuit 6 with the time delay T1 of a time delay circuit 4, this is the delay from the time for the rising output 'c' which takes place when a power source control 1 is turned from 'off' to 'on'. In addition, when the sensor input goes positive, the sensor input is applied to a signal processing circuit 3 after the delay time T2 of the delay circuit 6 has elapsed. Accordingly, even if the sensor input goes positive within the time frame T1, this sensor input becomes of no effect because power source voltage 'd' is turned off, so preventing unnecessary warning due to the driver's action from being given.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is installed in a vehicle, and when a sensor or the like detects an illegal intruder into the vehicle, an alarm is sent to a mobile receiver by flashing a horn or light, or by radio waves, etc. The present invention relates to a vehicle anti-theft device.

Conventional technology A conventional anti-theft device of this type is shown in FIG.

In FIG. 3, 7 is an attached power switch, 8 is a delay circuit, and 9 is a processing circuit for outputting an alarm signal. Next, the operation of the above conventional example will be explained. When the vehicle owner leaves the vehicle, he turns on the power switch 7. The delay circuit 8 receiving the power supply signal outputs to the processing circuit 9 that a certain delay time has elapsed. The delay circuit 8 is configured so that when the owner leaves the vehicle, the power switch 7 is turned ON in order to prevent sensor inputs such as an impact sensor attached to a door or a room light switch from being activated and outputting an alarm. This is to prevent the device from operating for a certain period of time after the When the sensor input is input to the device after the delay time has elapsed, it is determined that the person is trespassing into the vehicle, the sensor input is processed by the processing circuit 9 via the interface circuit 10, and an alarm is output.

Problems to be Solved by the Invention However, with the above-mentioned conventional anti-theft devices, since it is essential that the owner turn on the power to the device himself, there are restrictions on where the device can be installed, and furthermore, it is difficult to prevent unauthorized intruders. There is a problem in that it is relatively easy for the user to operate the power switch of the device himself, thereby stopping the operation of the device. Furthermore, even when the owner himself returns to the vehicle in a standby state, there is a problem in that the sensors and the like are activated and generate unnecessary alarm outputs.

The present invention solves these conventional problems by not using a power switch in the device itself, but by managing a certain delay time to determine whether or not to issue an alarm output. The purpose is to provide a device that solves the problem.

Means for Solving the Problems In order to achieve the above object, the present invention detects the state of the vehicle accessory voltage, controls the power supply of the device based on the state, and adjusts the alarm output timing by sensor signal input. A certain delay time is provided.

Operation The present invention has the above-described configuration, and constantly monitors the accessory voltage, and determines whether the accessory voltage is supplied or not.
Activation/deactivation of the device is controlled after a certain delay time has elapsed from the state change.

Embodiment FIG. 1 shows the configuration of a vehicle theft prevention device in an embodiment of the present invention. In Figure 1, 1 is an accessory.
2 is an inversion circuit that inverts the accessory (ACC>voltage); 3 is a signal processing circuit that issues an alarm output based on sensor input; 4 is the power supply; A first delay circuit for delaying the rise time of the output signal of the control circuit 1; 5 a sensor input interface circuit; 6 a first delay circuit for receiving a signal from the interface circuit 5 and outputting a delayed signal; This is the second delay circuit.

Next, the operation of the above embodiment will be explained with reference to the operation timing chart shown in FIG. When you pull out the accessory switch and try to leave the vehicle, the accessory voltage (b
) changes from ON to OFF, the output of inverting circuit 2 turns OFF.
turns ON, and the output of power control circuit 1 (C)
The interface circuit 5 and the delay circuit 6 are delayed by the delay time T1 of the delay circuit 4 from the rise from OFF to ON.
The power supply voltage (d) is supplied. On the other hand, the sensor input is sent to the delay circuit 6 as a signal (e) via the interface circuit 5.
However, the delay circuit 6 outputs to the signal processing circuit 3 that the sensor input has occurred after a delay time T2 has elapsed since the sensor input occurred. The signal processing circuit 3 is
Based on the signal from the delay circuit 6, the presence of sensor input is output as an alarm output (f). When the owner leaves the vehicle, even if a sensor input occurs during the time period T1, this signal becomes invalid because the power supply voltage (d) is OFF. Among the sensor input (e) (a) and (e) (b) signals that occurred after 11 hours, the alarm output signal (f) becomes T3 after the elapse of T2 due to the signal (a). Output. On the other hand, sensor input (
It is clear from the figure that (e) and (b) are treated as invalid. In other words, there are two cases in which sensor human power is generated by the owner's own actions on the vehicle: one is when the door is opened and closed when leaving the vehicle;
This is the opening and closing of the door when returning to the vehicle, and when leaving the vehicle, the opening and closing of the door must be completed within T2 hours, and in the case of returning, the accessory must be turned off within T2 hours after opening and closing the door. All you need to be aware of are these two conditions: to transition from to ON.

Effects of the Invention As is clear from the above embodiments, the present invention eliminates the troublesome operation of turning on and off the power of the device, and does not output unnecessary warning signals due to the owner's own actions on the vehicle. This has the advantage of being extremely effective in practical terms.

[Brief Description of the Drawings] Fig. 1 is a block diagram of a vehicle anti-theft device according to an embodiment of the present invention, Fig. 2 is a timing chart of the same device, and Fig. 3 is a block diagram of a conventional anti-theft device. . 1...Power control circuit, 2...
Inverting circuit, 3...Signal processing circuit, 4...
・Delay circuit, 5... Interface circuit, 6.
...Delay circuit. Name of agent: Patent attorney Toshio Nakao (11 people, Figure 1, Figure 2, E-2)

Claims (1)

[Claims] A power supply control circuit that controls the power supply system using an identification signal that identifies whether the accessory power is turned on or off; a first delay circuit that delays the output of the power supply control circuit for a certain period of time; and a first delay circuit that delays the alarm output based on the sensor input signal. A vehicle theft prevention device comprising a second delay circuit.