DE29619966U1 - Immobilizer / alarm system for two-wheelers - Google Patents

Description

Electronic immobilizer / alarm system for two-wheelers

1. Description

The invention relates to an electronic immobilizer/alarm system for two-wheelers. The operating principle can be applied to other security-relevant areas. The electronic immobilizer/alarm system consists of a coding circuit that is connected via a bus line key (part 3) and control unit (part 1). The code comparison takes place every time the electromagnetic key and the holder for the electromagnetic key (part 4) are contacted.

In addition, an infrared transmitter, an infrared receiver and a reed contact circuit are installed. In addition, a sensor is installed that registers the motorcycle being upright (in the driving position) and thus triggers the alarm if the electronic immobilizer / alarm system for two-wheelers has not been deactivated beforehand.

Description of the electromagnetic key

The external shape of the electromagnetic key is not limited, it only has to provide space for the coding module, magnet and infrared transmitter.

State of the art

I am not aware of any electronic immobilizer/alarm system for two-wheelers, or rather I was unable to find one in the House of Economics in Stuttgart, even after consulting employees. As with other immobilizers for cars, the ignition system, fuel system and engine starter are interrupted using electromechanical relays. Another special feature is that there is no plug connection on the control unit, which makes it impossible to simply bypass it. This immobilizer does not require any power when active, and therefore does not discharge the battery. With this solution, the standby current consumption of the electronic immobilizer is zero.

Advantages of the invention

The advantage is that when the immobilizer/alarm system is activated, no power is drawn from the vehicle battery. This makes it possible to secure two-wheelers for an unlimited period of time.

By simultaneously blocking the ignition system, starter and fuel system, bridging the starter circuit is completely ineffective. In order to overcome the immobilizer according to the invention, the code must be correct, the infrared signal must be correct and emitted in the right place, the contact transition (X1) must be in the right place and the reed contact must be closed. These criteria must all be met at the same time; for example, if the code does not match the stored one, the immobilizer cannot be deactivated. This leads to a very high level of security. The electronic immobilizer / alarm system for two-wheelers can be installed later or during production of the two-wheeler.

!.Immobilizer

There are three conditions required to deactivate the immobilizer. 1. The infrared signal must be emitted at the correct location on the electromagnetic key.

radiated {E3 Part 3), which then triggers the switching of the infrared receiving LED (E1 Part 4). This creates a positive voltage on the base of the transistor (T1).

2. In the electromagnetic key, the same coding must be present on (IC1 part 3) as on (IC2 part 1) in terms of coding. If they match, a positive signal is output on IC2. The coding is carried out with a positive, negative or no signal. If the coding between IC1 and IC2 is not correct, no positive signal is output via IC2 and the transistor T1 cannot switch through. If the coding on both sides of IC1 and IC2 is the same, the pin of IC2, for example, sends a positive signal.

The positive signal from pin 6 of IC2 is then applied to the emitter of (T1), which, if point 1 is fulfilled, causes transistor T1 to switch on. Transistor T1 then passes a positive signal to the base of T2, after which the two interrupt relays R1 and R2 are switched (this returns the interrupted lines to their original state).

The capacitor C1 extends the switching through of the transistor T2, thus creating the time to switch on the ignition (terminal 15).

3. The communication between (IC1) and (IC2) is only triggered when the permanent magnet in the electromagnetic key is in the right place, which causes switch S2 to switch through and close the bus line. If just one signal is missing, the immobilizer and thus the alarm system remain in the active state.

If the immobilizer is deactivated by inserting the electromagnetic key (into holder part A) and then removing it again, the immobilizer is deactivated for around 20 seconds. During this time, the ignition must be switched on to prevent the immobilizer from automatically reactivating. This means that terminal 15 must be applied to the normally open contact of relay R2, which means that plus is applied to resistor R10 and so T2 is always switched through when the ignition is "ON" if the immobilizer was previously deactivated. After the motorcycle has been turned off again and the ignition has been turned off, you have another 20 seconds to switch the ignition on. If this time is not used to switch the ignition on, the immobilizer is automatically reactivated.

2. Alarm system

The alarm system is basically only in operation when the immobilizer is active, i.e. when relay R1 is in the rest position and thus KI.30a is switched through. If the motorcycle is put in the upright position, i.e. in the driving position, and the immobilizer is not deactivated, a positive signal is output by the sensor S1, which causes the transistor T3 to switch through and the IC4 (part 2) to start to cycle, thereby controlling a relay via pin 3 (IC4), which also cycles. The capacitor C2 extends the switching through of the transistor T3 (approx. 25 seconds), thus achieving a follow-up time for the horn cycle signal. The relay is then used to control a horn; the existing horn can be used or an additional horn can be installed.

It is possible to deactivate the alarm system as long as the immobilizer remains active. This function is required for motorcycles with side and main stands, and is particularly useful for motorcycles with only one main stand. Because the motorcycle can be moved without an alarm being triggered. This function can be carried out using switch S3 (part 3). IC1 and IC2 have 4 transmission switches, of which only two are required, so this function is also coded DO - D3. The two selected input switches on IC1 (part 3) are also the outputs on IC2 (part 1).

The outputs are then passed on to the inputs IC3 (part 2) and this stores the last saved information. If you remove the electromagnetic key from the holder (part 4) without pressing the switch S3, the system is in the normal state, i.e. the immobilizer and alarm system are activated after approx. 20 seconds.

If you pull the electromagnetic key out of the holder (part 4) and keep the changeover switch S3 pressed until the electromagnetic key has completely left part 4, after 20 seconds the system is switched so that the immobilizer is active but the alarm system is switched off. This is achieved by grounding the base of transistor T3 via transistor T4, and thus transistor T3 cannot switch through.

Explanation of reference symbols

DO - D3: Coding of transmission switches

E3: IR - transmitting diode

Terminal 30a: Current-carrying terminal in the active state of the system

Class 30: Battery Pius

Kl. 15: Ignition "on"

Pin 1: Transition of the infrared signal from part 4 to part 1

Pin 2: Transition of the coded signal from Part 4 to Part 1

X1: Transition from Part 3 to Part 4

X2: Transition of the coded switch signal

Claims (6)

Protection claims 1. Electronic immobilizer / alarm system for two-wheelers that can be deactivated using an electromagnetic key (part 3). When active, the immobilizer / alarm system is de-energized, i.e. the ignition system, engine starter, fuel pump or other important devices on the two-wheeler are interrupted. When the operating voltage is applied, the correct coding is recognized, the infrared signal is recognized and the reed contact is switched through, the immobilizer / alarm system is deactivated and the electromechanical relays switch through, thereby closing all interrupted circuits. 2. Electronic immobilizer/alarm system for two-wheelers according to claim 1, characterized in that the uprighting (S1) of the two-wheeler in the driving position is registered and an alarm is thereby triggered if the system has not been deactivated beforehand. 3. Electronic immobilizer/alarm system for two-wheelers according to claim 1, characterized in that the included alarm system is only deactivated when the immobilizer is activated. 4. Electronic immobilizer/alarm system for two-wheelers according to claim 1, characterized in that the electronic immobilizer/alarm system is self-arming. 5. Electronic immobilizer/alarm system for two-wheelers according to claim 1, characterized in that the alarm signal can be deactivated {switch S3) as long as the immobilizer is still active. 6. Electronic immobilizer/alarm system for two-wheelers according to claim 1, characterized in that there is no plug connection on the control unit and thus simple bridging is prevented.