RU41440U1 - CAR SECURITY SYSTEM IMMOBILIZER - Google Patents

Abstract

The utility model relates to the field of automotive industry and can be used in the design of an immobilizer of a car security system. The utility model solves the problem of creating an immobilizer of a vehicle’s security system with advanced functionality. This problem is solved in that the immobilizer is additionally equipped with at least one driver of a signal supplied to the input of the microprocessor from the circuit of the limit switch of the passenger door, and the microprocessor of the immobilizer is additionally equipped with at least one input for connecting to the circuit of the limit switch of the passenger door and an output for connecting to control terminal relay enable electric windows of the car doors.

Description

The utility model relates to the field of automotive industry and can be used in the design of an immobilizer of a car security system.

It is known, see, for example, the magazine "Master 12 Volts", November-December 1999, p. 63, the use of electric windows for doors in a car’s security system.

APS-4 security system is known that is installed on VAZ cars, see the ABC magazine, July 2001, pp. 42-43, which includes an ignition key, an ignition switch, a transponder, a base transceiver transponder station equipped with a transceiver - transmitting inductive antenna intended for interrogation of a transponder, immobilizer, engine control unit, door limit switches, interior light, sound and light signaling devices.

The car’s security system is also known, see the journal “Automotive electrical equipment”, No. 5-6 / 2001, pp. 25-27, which includes an ignition key with a transponder integrated in the key head, an ignition switch with an inductive transceiver, intended for interrogation of a transponder, an immobilizer, a car engine control unit connected to the immobilizer by an information bus (in the cited

source - the so-called "K-line") and a light signaling device ("Check Engine" light).

There is a known design of an immobilizer of such a car security system, described in the above source and including a base transceiver station located in a single housing, equipped with inputs for connecting an external transceiver inductive antenna, an audio signal device, non-volatile storage device and a microprocessor equipped with an input for connecting to the limit switch of the driver’s door, an input for connecting to the terminal “15” of the ignition switch, an input for connecting Access to the vehicle information bus and random access memory.

The disadvantage of the immobilizer is the insufficient use of its resources to increase the level of comfort of the car.

For the prototype of the claimed technical solution, the design of an immobilizer of a car security system was taken, see patent RU 24666 U1, IPC 7 B 60 R 25/00, publ. 08/20/2002, which includes the base transceiver station located in a single building, equipped with inputs for connecting an external transceiver inductive antenna, signal conditioners from the driver door limit switch circuit and from the “15” terminal of the ignition switch, an audible signal a device, non-volatile storage device, as well as a microprocessor equipped with an input for connecting to the limit switch circuit of the driver’s door, an input for connecting to the terminal “15” of the ignition switch,

an input for connecting to the vehicle information bus and random access memory.

It should be noted that at the current level of development of the element base, non-volatile storage device can be equipped with its own case or can be placed in the microprocessor case.

The disadvantage of the prototype is the insufficient use of the resources of the immobilizer to increase the level of comfort of the car.

In particular, the immobilizer has the ability to determine the event “the key is in the ignition”, however, this feature is not used to control the windows.

Microprocessor inputs are also not fully utilized. The presence of free inputs allows you to connect to the microprocessor not only the limit switch circuit of the driver's door, but also the limit switch circuit of other car doors.

The objective of the claimed utility model is the creation of an immobilizer of a car security system with enhanced functionality that provides an increased level of vehicle comfort.

The indicated problem is solved in the immobilizer of the car security system, which includes the base transceiver station located in a single building, the signal conditioners from the driver door limit switch circuit and from the ignition switch terminal “15”, an audio signal device, non-volatile storage device, and microprocessor equipped with an input for connecting to

driver door limit switch circuits, an input for connecting to the “15” terminal of the ignition switch, an input for connecting to the vehicle information bus and random access memory.

The problem is solved in that the immobilizer is additionally equipped with at least one driver of the signal supplied to the input of the microprocessor from the circuit of the limit switch of the passenger door, and the microprocessor of the immobilizer is additionally equipped with at least one input for connecting to the circuit of the limit switch of the passenger door and an output for connecting to the control output relay enable electric windows of the car doors. In this case, the non-volatile storage device may be provided with its own housing or may be placed in the microprocessor housing.

The utility model is illustrated by the following drawings.

Figure 1 shows a structural diagram of an immobilizer of a car security system.

Figure 2 shows a structural diagram of a car security system.

The utility model can be successfully implemented in the design of the immobilizer 1 of the security system, see Figure 1, which includes the base transceiver station 2 located in a single housing, the shapers 3 of the signals arriving at the inputs of the microprocessor, an audio signal device 4, and a microprocessor 5, equipped with an input 6 for connecting to the limit switch of the driver's door, an input 7 for connecting to the terminal "15" of the ignition switch, an output 8 for

connection to the vehicle information bus, built-in random access memory 9 and non-volatile memory 10.

Non-volatile storage device 10, depending on the used element base, can be placed in the microprocessor case, as shown in Fig. 1, or can be equipped with its own case (not shown in Fig.).

To implement the utility model perform the following changes in the design of the immobilizer. The immobilizer 1 is provided with at least one driver 11 of the signal input to the microprocessor from the passenger door door switch circuit, and the microprocessor 5 of the immobilizer 1 is additionally equipped with at least one input 12 for connecting to the passenger door door switch circuit and an output 13 for connecting to the control output relay enable electric windows of the car doors.

The immobilizer 1 is designed to work as part of a car security system, see Figure 2, which includes, in addition to the immobilizer 1, the ignition key 14, the ignition switch 15, the transponder 16, the inductive transceiver antenna L of the base transceiver station 2, block 17 engine control panel 18 for controlling the electric windows of the car door, equipped with switches 19 and relay 20 for controlling the electric windows of the car doors, as well as the electric windows 21 of the car door beating.

Immobilizer 1 in the security system works as follows.

After the ignition key 14 with the built-in transponder 16 is inserted into the slot of the ignition switch 15 and the lock 15 is turned to the “Ignition on” position, the signal from the terminal “15” of the ignition switch 15 is fed to input 7 of the microprocessor 5 of the immobilizer 1. The immobilizer 1 sends a command to the base receiver transmitting station 2 for interrogation of transponder 16. The base transceiver station 2, by means of a transceiver inductive antenna L located around the ignition switch 15, interrogates the transponder 16. If the transponder 16 is recognized as legitimate, the base transceiver the receiving station 2 transmits a message to the microprocessor 5 of the immobilizer 1. The immobilizer 1 communicates through the output 8 via the information bus of the car with the car engine control unit 17 and allows the operation of the car engine. After the transponder 16 is recognized as legitimate, the output 13 of the microprocessor 5 of the immobilizer 1, designed to connect to the control terminal of the power window control relay 20, a voltage level appears that allows the operation of the power window control relay 20. As a result of this, if the position of at least one of the switches of the power window control panel is changed, the normal operation of said relay 20 becomes possible, which consists in supplying a supply voltage to the corresponding power window drive 21.

When the ignition switch 15 is turned to the “Ignition off” position, the signal from the terminal “15” of the ignition switch 15 is fed to input 7 of the microprocessor 5 of the immobilizer 1. The immobilizer 1 inhibits the engine control unit 17. The microprocessor 5 starts the countdown of a software defined period of time t. After a software defined period of time has elapsed, the output 13 of the microprocessor 5 of the immobilizer 1, designed to connect to the control terminal of the power window control relay 20, a voltage level is formed that prohibits the operation of the vehicle door power window relay 20. Thus, after the time t, the power window relay 20 stops responding to any changes in the position of the switches 19 of the power window control panel 18. The trip delay by the microprocessor 5 of the power window relay 20 controls electric windows is made to increase the convenience of using the windows in the time interval t after the ignition is turned off.

An exception to this rule are the following modes of operation of the immobilizer 1.

After turning off the ignition, when the driver or passenger door is opened, the immobilizer 1 sends a command to the transponder 16 to the base transceiver station 2. In this case:

1) in the event that the immobilizer 1 determines that the ignition key 14 with the legitimate ignition switch is located in the ignition lock 15

transponder 16, an audible warning device 4 generates an audible signal warning the driver about the key 14 left in the ignition switch 15, and the microprocessor 5 allows the control of electric windows, despite the expiration of time t after the ignition is turned off;

2) if after opening the door the ignition key 14 by the immobilizer 1 is not detected in the ignition lock 15, the microprocessor prohibits control through the relay 20 of the electric windows 21 of the windows, thereby ensuring the safety of the car.

Claims (3)

1. An immobilizer of the car security system, which includes the base transceiver station located in a single building, the signal conditioners from the driver door limit switch circuit and from the ignition switch terminal “15”, an audio signal device, non-volatile memory device, and a microprocessor, equipped with an input for connecting to the limit switch circuit of the driver’s door, an input for connecting to the “15” terminal of the ignition switch, an input for connecting to the information bus not a car and random access memory, characterized in that the immobilizer is additionally equipped with at least one driver of a signal fed to the input of the microprocessor from the circuit of the limit switch of the passenger door, and the microprocessor of the immobilizer is additionally equipped with at least one input for connecting to the circuit of the limit switch of the passenger door and an output for connecting to the control terminal of the relay for turning on electric windows of the car doors. 2. The immobilizer according to claim 1, characterized in that the non-volatile storage device is provided with a housing. 3. The immobilizer according to claim 1, characterized in that the non-volatile storage device is placed in the microprocessor housing.