Abstract: An antitheft apparatus for an automobile includes an engine starting key storing an identification code allocated inherently, a code reading circuit for reading out the identification code from the engine starting key inserted in a key cylinder installed on the automobile, a code collating circuit for collating the identification code supplied from the code reading circuit with a verification code stored previously, and an engine start decision circuit for enabling engine starting operation when the identification code coincides with the verification code, while upon occurrence of a discrepancy between the identification code and the verification code, for enabling the engine starting operation only when a door or accelerator pedal of the automobile is actuated in a predetermined manner. The automobile can be operated even when the key is lost or damaged and the identification code is unavailable.

Abstract: An anti-theft car protection system comprises a transmitter-receiver for receiving a code of the key, an immobilizer unit for collating said code as received with a code as registered and transmitting an engine start permission signal to an engine control unit when said code as received coincides with said code as registered, and means, cooperating with said immobilizer unit, for removing repetition of key operation upon start of the engine.

Abstract: A secondary ignition switch system that connects to a conventional ignition switch system of a vehicle to provide a security function. The secondary ignition system includes a dashboard mounted double-pole-double-throw (DPDT) switch and a key operated secondary ignition switch. The DPDT switch controls the operation of the primary and secondary ignition switches. To start the engine the DPDT is set to a position to power the secondary ignition switch, such that the engine can be started by turning a secondary key. However, based on the interconnection of the ignition switches the steering column of the vehicle remains locked. Only until the operator uses the primary key to unlock the steering assembly can the car be driven. This system enables the engine of a vehicle to run including powering the accessory circuit (for heating/cooling and power accessories) to warm a vehicle in cold climates with minimized risk since the steering assembly remains locked.

Abstract: A security device which is particularly suitable for motor vehicles is proposed. It comprises an electronic control unit (10) for controlling the functions of an apparatus to be protected, at least two sensors (U.sub.1, U.sub.2) for detecting specific operating states of the apparatus to be protected and a circuit (42) to which the output signals of the sensors (U.sub.1, U.sub.2) are fed. The circuit (42) carries out an exchange of data with the electronic control unit (10) in order to control its operational capability, the output signals of the sensors (U.sub.1, U.sub.2) influencing the exchange of data according to the detected operating state such that the electronic control unit (10) is only operative in a prescribed operating state of the apparatus to be protected. For this purpose, the circuit (42) has a memory (44) in which at least one predetermined code is stored.

Abstract: The security system comprises a coil (34) close to the vehicle ignition lock (38), a control unit (10) for energizing the coil and a transponder which comprises a coil (32), a transistor (30) and a transmitter (24) and a power supply (26). In use the coil (32) picks up a conventional alternating magnetic signal emitted by the coil (34), and provides sufficient power to activate the transistor (30) which connects the power supply (26) to the transmitter (24) causing it to transmit an enabling signal to the control unit. The control unit may be programmed to re-mobilize the vehicle engine on receiving of the correct signal.

Abstract: A removable security device for a vehicle is provided, having at least one portion adapted to be inserted into a cigar/cigarette lighter of the vehicle. A terminal receives power produced by an external power supply, and a signal modifier modifies a characteristic of the power produced by the external power supply to produce a verification signal. A reader detects a presence of the verification signal, and an enabler enables the vehicle to be driven when the presence of the verification signal is detected.

Abstract: A judgment is made as to whether an ignition key is inserted into a key cylinder, and when the ignition key is inserted into the key cylinder, a keyless entry operation is forbidden. Here, a judgment is made as to whether a door on a driver's seat side is slammed shut by a driver, and when the door on the driver's seat side is slammed shut, forbiddance of locking/unlocking control is canceled according to a command signal transmitted from a transmitter.

Abstract: A vehicle ignition system comprises a key cylinder and a key arranged such that the vehicle can be put in a state in which the key is removed from the cylinder leaving the engine running. The system includes a first safety check system which prevents operation to said state unless one or more of a first set of safeguard conditions is met. A timer is arranged to be automatically started to measure a predetermined time delay from removal of the key when the engine is running, and a second safety check system operates when the vehicle is in said state to shut down the engine automatically if one of a second set of safeguard conditions occurs, the second set of safeguard conditions including that the time delay has expired.

Abstract: If agreement between an identification code transmitted from a transmitter 111 installed in a door key 11 and a predetermined identification code is detected in an immobilizing ECU 12, a variable code including a predetermined key word is transmitted from the immobilizing ECU 12 to an engine ECU 13, and the variable code is decoded in the engine ECU 13. If the decoded key word does not agree with the predetermined key word, the starting of the engine is inhibited.According to another aspect of this invention, a variable code is transmitted from the engine ECU 13 to the immobilizing ECU 12, a returning variable code is calculated based on a predetermined key function in the immobilizing ECU 12, and it returns to the engine ECU 13. If an agreement with returned variable code and a reference variable code determined in the engine ECU 13 is detected for the predetermined period, the starting of the engine is inhibited.

Abstract: When a key is inserted into a key cylinder and a key insertion switch switches from an open state to a closed state, a signal is provided to a main relay controller. This main relay controller provides a low level signal to a base of a first transistor to actuate a coil. Therefore, a contact point is closed and power is supplied to an anti-theft controller and an engine controller. Thus, these controllers do not consume power until the key insertion switch is closed and thus, their construction can be made simple since there is no need to operate them in a sleep mode.

Abstract: An ignition coil operatively coupled with an engine and an electronic ignition system coupled to an electric power supply and activated by a key, the ignition-disabling anti-car jacking device including a relay mechanism coupled between the ignition coil and the ignition system of the vehicle and with the relay mechanism being enabled for energizing the ignition coil when the ignition system is activated with the key and further being disabled for de-energizing the ignition coil when the ignition system is deactivated with the key; a first timer mechanism for transmitting a first switching signal after a first predetermined period of time; a second timer mechanism for transmitting a second switching signal after a second predetermined period of time; a first switching mechanism coupled between the first timer mechanism and the second timer mechanism and responsive to receipt of the first switching signal from the first timer mechanism for activating the second timer mechanism; a second switching mechanism cou

Abstract: An electrical anti-theft security system for a motor vehicle includes an anti-theft security switch for controlling starting of the engine of the vehicle and for the supply of power to various electrical circuits of the vehicle. This anti-theft switch comprises a key interruptor and a multiple position control interruptor for controlling, in sequence, the power supply to various electrical circuits of the vehicle, including those for the ignition and the starter. The system also includes interruptors for the power supply of the electric motor of the anti-theft system, together with an immobilizing device for preventing the supply of power to at least one electrical circuit of the vehicle when the anti-theft system is not in its unlocked condition.

Abstract: A bold thief security system is provided that allows a user to remotely disable a vehicle that has been carjacked. Three methods are provided to contact a control unit mounted in the vehicle. One method uses a pager to send a code to the control unit. The second method uses a wrist watch with a built-in transmitter. The third method uses a conventional cellular telephone connected to the control unit so that a telephone can be used to disable the vehicle via a coded phone call. The bold thief security system helps the victim to quickly recover the stolen vehicle while not endangering his own security.

Abstract: A vehicle ignition key device directly activates a rotary switch by a rotation-driving mechanism remotely driven by an external control signal for stopping the engine of the vehicle. The device is further useful as a burglar-proof device. A rotary switch can be placed in OFF, ON and START positions by key operation, and a rotation-driving mechanism activates the switch in each of the positions by receiving an externally dispatched signal. Further, this device is constructed for use as the burglar-proof device by being provided with a vehicle speed detector and a mode switch for burglar-proofing.

Abstract: An anti-theft system is arranged so that an operation of an engine of a vehicle is maintained as it is even when a CPU of an engine control unit is reset for some reason during when the engine is operative. A CPU of a security ECU performs arithmetic operations for enabling or inhibiting injection of fuel to the engine and for enabling to start a starter on condition that a door key switch and an ignition switch are both turned on. The CPU of the engine ECU performs arithmetic operations to maintain the injection of fuel to the engine based on data of fuel injection enabling or inhibiting process stored in a B/U RAM even when it is reset after receiving the data of process for enabling or inhibiting the injection of fuel from the CPU.

Abstract: An engine control system in which control of an engine can be performed after there has been a momentary power disconnection of a power supply, such as the vechicle battery, from an engine control unit of an electronic circuit which executes an anti-theft function. A power supply detecting circuit detect a connecting of the power supply to the engine control unit. A further circuit determines on the basis of the vehicle speed and the RPM whether or not the vehicle is running. When a connecting of the power supply to the engine control unit is dectected, a determination is made whether or not the power supply connecting has occured after a preceding momentary power disconnection if the further circuit determines that the vehicle is running. The anit-theft function of the electronic circuit is disable when it is determined that there has been a preceding momentary power desconnection.

Abstract: An apparatus and method for preventing car-jacking including a receiver situated within a vehicle and adapted to allow the receipt of the activation signal and deactivation signal from an off site transmitting source similar to that employed in the art of pagers. Also included is a control mechanism electrically connected to an existing alarm, ignition coil of a vehicle, and the receiver. The control mechanism is adapted to activate the alarm and deactivate the ignition coil after a predetermined amount of time upon the receipt of the activation signal by the receiver. The control mechanism is also adapted to deactivate the alarm and activate the ignition coil upon the receipt of the deactivation signal.

Abstract: Electronic security system for controlling access to an automotive vehicle. The security system includes a computer system having a processor subsystem connected to selectively enable or disable an ignition system of the automobile and a memory subsystem having ignition, valet and reprogramming key codes and first, second and third validation codes stored therein. To control access to the vehicle, an encoded signal containing a device code and an authorization code is propagated to the processor subsystem where the codes are compared to the ignition key, valet key, reprogramming key and validation codes. If the propagated device and authorization codes match the ignition key and first validation codes, the processor subsystem enables the ignition system for a pre-selected time period. If the propagated device and authorization codes match the valet key and second validation codes, the processor subsystem enables the ignition system.

Abstract: An anti-theft and anti-carjacking system for an engine powered vehicle. The system has a remote transmitter which selectively operates a vehicle mounted receiver and switch. The switch, when actuated to a selected position, interrupts electrical continuity. The transmitter is compact and is preferably embodied in an article carried or worn by the driver such as a wristwatch. In the preferred embodiment, activating the system to the anti-theft or armed condition will also engage an internally mounted lock in the engine compartment to prevent attempts at circumventing the system.

Abstract: An antitheft apparatus for an automotive vehicle includes: door lock mechanism assemblies (110, 210, 310 and 410) for locking vehicle doors, respectively; constraining (stopper) members for constraining the door lock mechanism assemblies once actuated to a lock status so as not to be unlocked, respectively; a set switch (125) for outputting a constraint command for constraining the door lock mechanism assemblies once actuated to the lock status so as not to be unlocked; and a controller (1) responsive to the constraint command outputted by the set switch, for first locking the doors by the door lock mechanism assemblies and then constraining the door lock mechanism assemblies to the lock status by use of constraining members, respectively.

Abstract: An apparatus for preventing unauthorized use of machinery having an internal combustion engine (such as a motor vehicle) comprises an interruption subcomponent (46) for controlling flow of electrical current to an electrical ignition system (18) by allowing electrical current to flow from a power supply (10) to the electrical ignition system when the internal combustion engine is started, and thereby allowing the engine to run, and for interrupting this flow in response to an operator preforming an activity for further operating the machine (such as applying brakes or shifting gears). The apparatus also includes an arming subcomponent (48) for arming the interruption subcomponent (46) in response to the engine being started and disarming the interruption subcomponent in response to a manual manipulation of a switch (42, 44) of the arming subcomponent. In the described embodiment, the interruption and arming subcomponents respectively include interruption and arming solenoid switches.

Abstract: A security system for automatically disabling an interruptable circuit vital to the operation of a motor vehicle after an ignition of the vehicle is turned off or disabled. The security system includes a base circuit with a relay for disabling the interruptable circuit after the ignition is disabled. The base circuit includes a logic circuit that detects when the ignition is disabled, and for sending a disable signal to the relay. In one embodiment, the base circuit includes a timer circuit for delaying the disable signal to the relay for a specified time period after the ignition is turned off. The disabled interruptable circuit, and the disabled motor vehicle, may be enabled upon actuation of a remote transmitter, or switch on the base circuit. The base circuit also includes adapters for connecting the base circuit to the interruptable circuit and to a power supply of the motor vehicle at a fuse panel of the motor vehicle.

Abstract: An engine security system includes a security device adapted to receive a sequence of timing pulses which is generated in dependence on the rotation of the engine. The device generates an ignition pulse sequence synchronous with rotation of the engine from the sequence of timing pulses on receipt of an enabling code. The ignition pulse sequence is supplied to the ignition system of the engine for the generation of ignition sparks. The pulses in the timing pulse sequence occur at different times from pulses in the ignition pulse sequence. In preferred embodiments, the sequence of timing pulses includes an identity code encoded therein.

Abstract: An anti-theft system for a motor vehicle includes a portable transponder carrying code information. A stationary transceiver has an oscillator and an oscillating circuit being excited to oscillate by the oscillator at an oscillation being modulated by the transponder in synchronism with the code information. A demodulator demodulates the modulated oscillation of the oscillating circuit. According to one embodiment, the code information is obtained from the demodulated oscillation by sampling the oscillation at least at one predetermined sampling time. An arithmetic unit compares the code information with command code information and transmits an enable signal to a security unit if a match occurs. The modulated oscillation being shifted by a predetermined phase angle is sampled once again if initially no code information is recognized from the demodulator.

Abstract: A control circuit for an automobile having an ignition switch with an ACC position and a start position, a starter motor, and an ignition coil which includes a pager circuit for receiving a digital signal from a telephone company resulting from a telephone call made thereto, a control code register connected with the pager circuit for storing the control codes from the pager circuit, a power circuit for supplying the electric power required by the control circuit, an alarm driving circuit, an activating circuit of an automobile door for receiving a signal from the control code register and activating the alarm driving circuit when the door is opened by an unauthorized person, a starter motor controlling circuit for turning off the starter motor when it receives an activating signal therefrom and when the ignition switch is in the ACC position and activating the alarm driving circuit when the ignition switch is in the start position, an ignition coil cut-off circuit for cutting off the ignition coil, and a cen

Abstract: An anti-theft device for a motor vehicle wherein a personal identification unit is carried by an authorized operator of said motor vehicle and includes means for identifying its location in the vicinity of the motor vehicle. A vehicle control unit mounted onto the motor vehicle, has a first and second condition with means for allowing operation of the motor vehicle when the control unit is in the first condition and means for inhibiting operation of the motor vehicle when said control unit is in the second condition and means for shifting the control unit into the second condition at a time subsequent to removal of the identification device from the vicinity of the motor vehicle.

Abstract: A vehicle anti-theft system is provided comprising a mechanical security device mounted in a vehicle to limit rotation of the vehicle steering wheel and an electrically operable security device having armed and disarmed modes in which the starting motor circuit for the vehicle is respectively opened and closed independent of the vehicle ignition switch. The mechanical device includes a key operated locking mechanism for mounting and dismounting the device, the electrically operable device includes a key operated switch mechanism for arming and disarming the device, and the key operated locking mechanism and key operated switch mechanism are operable by the same common key. The electrically operable security device includes circuitry for maintaining the starting motor circuit of the vehicle open in response to an effort to bypass the key operated switch mechanism.

Abstract: The system of the invention employs a control module in communication with a remote keyboard pad module and sensor housing, wherein typically a plurality of sensor housing are arranged, one mounted under a passenger and another under a drive portion of the associated vehicle seat, such that actuation of each or one of the sensors will effect actuation of an associated alarm upon failure to properly enter an associated numerical code into the keypad module upon lapse of an associated time interval. The sensors are arranged for mounting to the seat springs in a readily retrofit manner relative to an associated vehicle to orient the associated sensor plates of the sensor housing in proper orientation relative to the seat.

Abstract: A vehicle antitheft system includes a housing connectable to the casing of a starter motor and a silicon controlled rectifier (SCR) disposed in the housing. The system includes a battery connector which engages the starter motor power line from the battery, and a starter connector which engages the power terminal of the starter motor, with the SCR being in electrical series between the connectors. A control circuit is mounted in the housing, and the control circuit closes the power switch for a predetermined period upon receipt of an enable signal from a hand-held rf generator. Consequently, the vehicle can be started by turning the ignition switch only during the predetermined period.

Abstract: An ignition key device including an ignition key for use with a motor vehicle and a remote unit which is capable of remotely locking and unlocking a door of the motor vehicle and displaying information concerning and the status of the motor vehicle. A secondary cell is accommodated in the ignition key. When the ignition key is inserted into an ignition switch lock in the motor vehicle, the secondary cell is charged by a storage battery of the motor vehicle. When the ignition key is attached to the remote unit, the stored electric energy is supplied from the secondary cell to the remote unit to energize the remote unit for transmitting and receiving signals to perform the functions of remotely locking and unlocking a door of the motor vehicle and displaying information and the status of the motor vehicle. The ignition key can be detached from the remote unit.

Abstract: A steering wheel anti-theft system for an automobile having an ignition key switch assembly and a steering wheel wherein a pair of extendable rods are built into the transverse body of the steering wheel for radial extension and retraction in between an extended position wherein they are visible and interfere with the driving of the automobile and a storage position wherein they are retracted in the steering wheel and do not so interfere. The steering column ignition key assembly includes an electric switch which is opened and closed by the turning of a key for connecting or not connecting a source of electrical power to electronically operated latches for securing said rods in extended positions when said switch is opened or allowing it to be retracted only when said switch is closed.

Abstract: A remote-control key for use in a remote-control system is provided with a transmission circuit in a key grip and used for transmitting an atmospheric propagation signal as an locking or unlocking signal containing an ID code. When the key is inserted into an IG key cylinder and detected by an IG key position switch, a control unit on the automobile side is adapted to accepting the atmospheric propagation signal received via an antenna for a predetermined period, verifying the ID code, outputting a signal for effecting an engine-starting operation when the key is proper, and permitting an engine being started. It is thus prevented to start the engine unlawfully with a mechanically-copied key.

Abstract: An antitheft device for a vehicle such as a motorcycle or an automobile for preventing theft of the vehicle by controlling the ignition system of the vehicle. The antitheft device includes a power supply, an ignition device for starting the vehicle's engine, an ignition switch having a switch mechanism for opening and closing a power circuit between the power supply and ignition device and an antitheft unit. The ignition switch includes a mechanical locking mechanism for selectively preventing the normal steering operation of the vehicle as well as sensors for detecting the removal or destruction of the switch mechanism or the mechanical locking mechanism. The antitheft unit causes a first disablement condition in response to an input signal where at least a part of the ignition device is disabled and causes a second disablement condition in response to the detection of an abnormality by the sensors where at least a part of the ignition device is disabled.

Abstract: A lock for the ignition circuit for an automobile including a Hall effect control sensor which is activated by a control magnet on the cylinder member of the lock so that when the cylinder is rotated by the key to its start position, the control sensor is activated. The activation of the control sensor provides one of several starting criteria to an ignition for starting an automobile. An anti-tampering sensor spaced from and adjacent to the control sensor has a trip level which is lower than the trip level of the control sensor so that magnetic forces induced from the exterior of the lock cannot trip the control sensor. A blocking plate is disposed between the control sensor and the anti-tampering sensor to prevent the anti-tampering sensor from being tripped by the control magnet when the cylinder member is rotated to its start position and to enable the anti-tampering sensor to be tripped first to produce a deactivation signal in response to a magnetic force induced from the exterior of the lock.

Abstract: An anti-theft starter circuit system and electronic circuit security module housing apparatus for use therewith in a motor vehicle having an electrically operable starter motor and solenoid arrangement, the electronic circuit security module housing being mechanically adaptable to and installed directly upon existing starter solenoids, and a system access code entry device within the vehicle operator's compartment.

Abstract: The invention relates to a hand-held transmitter for the remote control of various vehicle systems with integrated normal key. A housing has electronics and the normal key connected to the said housing, and a sensor system which detects positions or movements of the normal key. Here, a code for the remote-controlled actuation of at least the lock system of the vehicle is emitted as a function of the signals of the sensor system.

Abstract: A security system for an automotive vehicle having an engine is operatively connected between engine running electrical components which are connected to an electrical power source and a lock switch having at least two operative positions. The security system has a lock switch operator having a memory device carried thereon with a first security code stored in the memory device. A theft control module having a memory storing a second security code is operatively connected between the switch and the engine running electrical devices. The theft control module operates to first permit the engine running electrical components to enable the starting of the engine and then to compare the first and second security codes. Upon finding the first security code not equal to the second security code, the engine running electrical components are disconnected from the electrical power source which disables the engine.

Abstract: An anti-tamper shielding panel is held in position over an opening beneath an auto alarm installed in an auto engine compartment by a series of tension cables anchored at points within the engine compartment. The alarm is protected from efforts to disable the alarm by preventing reaching up through the opening.

Abstract: Vehicle security protection system provides anti-theft security system for the voluntary vehicle vacate situation, regardless of whether the engine is running. When a thief trips the armed system, the engine ignition circuit is instantaneously and continuously broken at the vehicle's engine ignition module. The system is difficult to hot-wire or to reset. An anti-hijack security protection system is also provided which can interface with the anti-theft system. Either system can be "armed" regardless of engine status. However, the user must be in the vehicle before arming the anti-hijack system because the door/courtesy light circuit is used as the trigger circuit for engine kill. A time delay is provided in the anti-hijack mode to cause the thief to commit to public actions and to give the owner time to escape from the hijack scene. In either mode, when the system is tripped, the fuel gauge indicates an empty tank condition.

Abstract: An antitheft apparatus for an automotive vehicle comprises: a transponder (1) buried in an ignition key to store an ID number thereof; a receive unit (2) to receive the ID number of the ignition key inserted into the ignition key cylinder; an immobilizer unit (3) for outputting an engine start enable signal when the received ID number matches one of the stored ID numbers and not outputting the engine start enable signal when does not match; and an engine control unit (5) for enabling an engine drive in response to the reception of the engine start enable signal but disabling the engine drive in response to no reception of the engine start enable signal. In particular, the engine drive unit (5) keeps the immobilizer unit (3) inoperative for a predetermined time duration when the engine cranking operation is detected and allows the immobilizer unit (3) to be operative after the predetermined time has elapsed.

Abstract: An anti-theft system is described adaptable to any motor vehicle having a removable accessory electronic unit such as a high-fidelity stereo component unit installed within a mounting bracket and slidably detachable therefrom. Upon leaving the car, the vehicle owner takes along the entire accessory unit, or alternatively takes only a detachable front control panel from the unit, for secure safekeeping or to be retained in the personal possession of the owner. At the same time, continuity of the electrical circuit supplying current from the storage battery to the motor vehicle fuel pump (or ignition switch, or other control component of the vehicle) is interrupted, thus preventing normal operation of the vehicle and protecting against unauthorized use.

Abstract: The present invention relates to a device for shutting off an engine remotely and sounding off an alarm locally and which includes an alarm motor, a module for activating the alarm motor, a key switch for turning the module on and off, a siren connected to the alarm motor, and a battery with an alternator terminal.

Abstract: A vehicle anti-theft ignition disabling device for interrupting the ignition circuit of a vehicle for preventing its engine from being started. A terminal block has electrically conductive first and second terminals with the first terminal coupled to a positive terminal lead of an ignition circuit and the second terminal coupled to a negative terminal lead of an ignition circuit. A switch mechanism is coupled between the first and second terminals of the terminal block and actuated to a closed orientation for enabling an ignition circuit of a vehicle and actuated to an opened orientation for disabling the ignition circuit of a vehicle. A key mechanism is provided for actuating the switch mechanism to the closed orientation and actuating the switch mechanism to the opened orientation.

Abstract: An anti-hijacking and theft prevention device for motor vehicles having a fuel restricting solenoid valve assembly including an interchangeable solenoid operated fuel restricting valve and a circuit for operating the system. The solenoid operated fuel restricting valve is installed in the vehicle's fuel line. When the ignition key is inserted into the ignition switch of a vehicle and turned to the "on" position and the engine is started, a timer will start to count down from a predetermined period of time. If the system is not disabled by activating a hidden switch during the count down period, the solenoid operated fuel restricting valve moves from an open position to a closed position. The solenoid valve has a small valve orifice which allows only a small restricted amount of fuel to flow through the valve assembly in the fuel line. While the amount of fuel is sufficient to keep the engine from stalling, the vehicle will be capable of a speed of no more than 5 to 10 miles per hour.

Abstract: An anti-theft system that can be retrofitted onto existing aircraft disables the starter motor of an engine or engines a predetermined time after the aircraft is taken out of service and re-enables starting only after the pilot has provided adequate identification (e.g. by entering a personal identification number at a cockpit keyboard). The predetermined time interval is selected to be long enough to ensure that the system does not impose a flight hazard by preventing in-flight re-starts. In a preferred version of the system, a drop in the output voltage of the aircraft's main electric power system is used as an indication that the aircraft is out of service. To simplify installation on existing aircraft, the system provides for communication among various functional elements over a pre-existing part of the aircraft (e.g. by imposing AC tones on a starter motor control line).

Abstract: A new and improved anti-carjacking apparatus for a motor vehicle includes an open door sensor assembly and a first timer assembly actuated by the open door sensor assembly. A first switch actuator assembly is activated by the first timer assembly for a first predetermined period of time. The first timer assembly controls a ready state for the first predetermined period of time. A second timer assembly is actuated by the first timer assembly. The second timer assembly is actuated after actuation of the first timer assembly by a second predetermined period of time which is a delay period. A deactuation switch assembly is capable of being manually actuated by a person and is capable of deactuating the first timer assembly and the second timer assembly.

Abstract: A safety system for abating the theft of vehicles comprising a door sensor switch adapted to generate a signal when the vehicle door is closed; a disarm switch adapted to be triggered by an authorized driver when the door is closed; coupling means secured with respect to the battery of a vehicle for providing power; and a control box coupled to the door sensor switch, disarm switch and battery through lines therebetween, the control box adapted to generate an alarm signal at a predetermined time after the door sensor switch determines that the door is closed and the motor is running unless the disarm switch is triggered by an authorized driver within a predetermined time following the closing of the door.

Abstract: An anti-hijacking and anti-theft vehicle security protection system is designed to permit, in the anti-hijacker function, the hijacker to drive off with the vehicle but within about two minutes the engine will be partially disabled to permit maneuvering the vehicle out of traffic to the side of the road. A few minutes later, the engine will be totally disabled and signalling devices can be activated. The system employs two overlapped timers under control of a sensor relay. A reset button under control of an authorized user can deenergize the sensor relay to return the system to normal. Also included within the design is anti-theft protection for an unattended vehicle which can be selected to function in any one of 3 conditions, one condition being the anti-hijacking function. In the second condition, operation of the vehicle is first partially disabled and then completely shut off. In the third condition, the vehicle cannot be started, and hazard lights and alarm are activated.

Abstract: An alarm system is disclosed which includes a triggering device which triggers a warning device in the case of an unauthorized change of the position of the motor vehicle. The device comprises a compass by means of which the actual position value is reported to a control apparatus. As soon as the compass reports a value to the control apparatus which deviates from the stored position value, the warning device is activated.

Abstract: Apparatus is disclosed herein for installation on an automotive vehicle which includes a receiver operably responsive to a remotely transmitted signal for incapacitating the vehicle power plant and for actuating warning lights indicative of vehicle unauthorized usage. The system includes a control unit response to operation of the receiver to interrupt fuel provided to the fuel pump via a centrifugal switch. Brake and hazard lights are energized to indicate a warning and hazard condition while the required triggering of an SCR or a power mosfet semiconductors coupled to the starter isolates the starter from the auto ignition system. A reset circuit is included for returning to normal auto operational systems and a delay circuit coupled to the control unit delays energizing the system for a predetermined period of time.