Abstract: A vehicle alarm set signal level control that controls the volume of a car alarm and also the output level of the alarm setting or arming signal. The alarm volume is controlled by a frequency responsive circuit employing a silicon control rectifier in combination with a zener diode and a resistance that can be left in or removed from the circuit. Arming signal level control is comprised of a bypass circuit employing a transistor and a photo detector in combination with a potentiometer. The level of the output signal when setting the alarm is varied according to the amount of light available. In an optional embodiment for a car alarm using a low level signal both an arming signal setting signal level control and a visible output are used. The circuit employs a pulse rate controller providing an output through a protection circuit and a volume control to a piezoelectric tone generator.

Abstract: A vehicular security system includes an electronic supervisory control unit which communicates with a remote signalling unit to provide both conventional alarm system functions typically associated with securing an unoccupied vehicle as well as anti-carjacking functions. The anti-carjacking functions may be remotely initiated by the vehicle operator who has been forcibly removed from the vehicle or passively initiated and include locking the vehicle doors, closing the vehicle windows, and thereafter disabling the engine to confine a criminal carjacking perpetrator within the vehicle to wait apprehension by law enforcement authorities.

Abstract: A security system for a vehicle of the type having an engine with a starting switch movable between an OFF position and an engine START position includes an alarm module for disabling the engine and/or sounding an alarm in the event of an intrusion into the vehicle. Activating means activate the alarm module either automatically when the vehicle operator leaves the vehicle or in response to a signal from a transmitter in the operator's possession. The alarm module can be disarmed or deactivated without the transmitter by turning the engine starting switch from its OFF to its START position a selected number of times. A time delay may also be incorporated into the system so the disarm code may be a selected number of start attempts in combination with a selected time delay(s) before, during or after those attempts have been made.

Abstract: A thyristor controlled series capacitor (TCSC) system, including a method and apparatus, uses phase controlled firing based on monitored capacitor voltage and line current. For vernier operation, the TCSC system predicts an upcoming firing angle for switching a thyristor controlled commutating circuit to bypass line current around a series capacitor. Each bypass current pulse changes the capacitor voltage proportionally to the integrated value of the current pulse. To damp the natural oscillatory response of the inductive commutating circuit and the capacitor, a bypass mode firing angle is introduced to create a nonlinear response. The harmonic distortion on the commutating circuit current waveform is determined from the capacitor voltage, which is then used to determine the magnitude of the firing angle. Preferably the firing angle magnitude decreases in response to decreasing capacitor voltage, eventually returning to steady-state conditions.

Abstract: A new and improved automobile anti-theft switch is installed in series with ignition circuitry for the automobile. The apparatus includes a relay assembly which includes a relay-controlled switch. The relay-controlled switch is in series with the ignition circuitry for the automobile. A relay driver assembly is connected to the relay assembly and controls the relay-controlled switch. A timer assembly is connected to the relay driver assembly and controls operation of the relay driver assembly and the relay assembly. A disguised first switch assembly is connected to the timer assembly. When the disguised first switch assembly is in the closed state, it controls initialization of the timer assembly. On the other hand, when the disguised first switch assembly is moved to the open state, it permits discharge of the timer assembly.

Abstract: A vehicle anti-theft control which prevents the vehicle from being started by providing a code input authorization system working in combination with an enclosed controller relay system of a solonoid which prevents the starter motor from engaging the engine until after a correct code authorization is received. The controller is housed in an intermediate chamber of a solonoid housing and cannot be circumvented by exterior hot wiring so as to prevent electricity from passing to either the pulling or holding coils of the solonoid.

Abstract: An electronic key and lock system, particularly useful for solenoid-operated locks employs a key that can operate electronically and mechanically. The key is mechanically polarized with its blade forming a first electrical contact and a separate second contact which is flush or raised relative to the blade. Each of the key and the cylinder employs respective light emitting and light receiving IR devices for communications between the electronics in the key and communications within the lock. The lock includes a solenoid-operated electronic cylinder.

Abstract: A car security system has a proximity sensor such as a radar sensor with variable sensitivity and capable of producing a detection signal upon detecting motion of a person in a monitoring area. A control circuit is provided controls the sensitivity of said proximity sensor. The system also has a monitoring/alarming control circuit for control of predetermined monitoring and alarming control on the basis of the output from the proximity sensor, and alarming devices such as a headlight flash circuit, buzzer and siren for performing a predetermined alarming operation under the control of the monitoring/alarming control circuit. The sensitivity control circuit operates in response to a predetermined operation such as an arming start operation to vary the sensitivity of the proximity sensor so as to automatically set the sensitivity to a first sensitivity level which is the highest level within a range which does not cause the sensor to produce the detection output.

Abstract: A vehicle anti-theft device comprising a gear shift lock and an ancillary vehicle anti-theft device which is operated automatically by operation of the gear shift lock.

Abstract: A system and method is provided compensating utility distribution line transients such as voltage sags in a dynamic manner, by inserting a voltage signal in series with the distribution signal having a magnitude and phase to effectively cancel out the voltage deviation caused by a network disturbance. An energy storage device such as a storage capacitor is used to provide energy to an inverter circuit which is controlled to generate the series-inserted signal. Preferably a converter such as a chopper is utilized between the storage element and the inverter, to provide a constant dc input to the inverter. A controller generates a corrective error signal based upon the deviation between the utility supply voltage as affected by the disturbance, and the nominal ideal voltage signal, and adjusts the insertion voltage so as to optimize real power delivery to the utility distribution line.

Abstract: An antitheft system for use with a vehicle. The vehicle used with the system has a battery for providing a constant voltage source and a ground reference, and an electrically-controlled operational feature, wherein activation of the feature is necessary for operating the vehicle. The system includes a first harness connector with a plurality of contacts for connecting to a second harness connector having corresponding contacts. The second harness connector is connected to a security module having antitheft functions. The plurality of contacts of the first harness connector includes a first contact for connecting to circuitry in the vehicle for providing an activating signal to activate the operational feature. Also included is a second contact connected to a terminal of the electrically controlled operational feature, where the terminal is for receiving the activating signal to activate the operational feature.

Abstract: An alarm system (10) for use with a vehicle. The system (10) monitors when the driver's seat becomes newly occupied (17) and begins a countdown, during which interval an authorized user can utilize an operator actuated switch (18) to terminate the automatic arming process. If this switch (18) is not used during the predetermined period of time, then the system (10) automatically arms itself. Once armed, the system (10) monitors reception of law enforcement radar signals through use of an appropriate detector (16). When such a signal has been detected, thereby indicating proximity of law enforcement personnel, the system (10) activates one or more alarm devices, each intended to call attention of the law enforcement persons to the vehicle in question, and/or to urge the thief into now leaving the vehicle.

Abstract: A fault current surge bypassing and transitional impedance compensation system for preventing subsynchronous currents on electrical power lines, with parallel lines being protected from the clearing of transient faults. Capacitor banks serve as only a partial solution to the disturbances with transient faults during conventional recovery modes of operation. The fault current bypassing and impedance compensation system, coupled in series to each transmission line, clears a transmission line fault current and dynamically balances the inductor impedance on the transmission line after the fault mode clears when a return is made to the normal mode of operation. A circuit based solid-state switching power converter or "voltage-sourced inverter" with self-commutating GTO semiconductor switches is used, having all GTOs switched-on and maintained in this condition for the fault current to pass.

Abstract: A vehicle security system for protecting a vehicle from carjacking and from theft while the vehicle is unattended. The portion of the security system which protects the vehicle from theft while the vehicle is unattended is selectively initiated by pressing a command button on a remote control transmitter. In response thereto, a first disablement sequence is initiated which includes disabling the vehicle. The portion of the security system which protects the vehicle from carjacking is automatically initiated by the starting of the engine. A second disablement sequence is initiated upon either the sensing of a door opening while the engine is running or upon receipt of a signal transmitted by the remote control transmitter. The second disablement sequence provides a warning to persons inside and outside the vehicle prior to engine disablement and the actuation of a plurality of sirens.

Abstract: A solid state computer circuit system is provided that senses the state of the ignition switch, setting a lock out circuit to prevent the car from being started if a hidden switch (or other enabling circuit) is not activated. There is a solid state timing circuit locking out the ignition system automatically after a predetermined time when the ignition switch is turned off (typically thirty seconds). The system is actuated with a hidden switch (or an electronic device like a garage door opener or a digital key pad with an alarm circuit sounding an alarm if the wrong code is input or a foreign item is used in an effort to wrongfully enable the basic system circuit).

Abstract: A security system for an automobile starter system is an electrical installation on the automobile whereby the starter system of the automobile can be actuated only when a correct ignition key to the automobile is used. Also, the starter system is safeguarded from being mistakenly actuated as the automobile motor is running. Two types of electrical circuit configuration are proposed to perform the automobile starter system security functions. The first electrical circuit configuration utilizes the analog circuitries applied with voltage window detection concept. The other electrical circuit configuration utilizes the sequential digital circuitries applied with the signal code detection concept.

Abstract: A vehicle anti-theft device disengages the ignition of the vehicles in which it is installed after a predetermined time has elapsed after a foot switch is pressed with the ignition system on. After a second period of time after the foot switch is pressed a horn is activated and tear gas is dispensed through the ventilation system of the vehicle into the passenger compartment.

Abstract: A keyless lock system for a vehicle includes a card for transmitting a radio signal, at least one onboard antenna for receiving the radio signal, and a control unit for allowing and preventing keyless lock and unlock operations in dependence on the existence or nonexistence of the card in a predetermined area near the antenna. The control unit monitors the position of of at least one monitored door, and produces a card warning signal each time the monitored door is closed if the card is absent in the vehicle.

Abstract: A compact transportable electromagnetic pulse (EMP) generating system for generating and transmitting EMPs at a target vehicle to disrupt electronics controlling operation of the target vehicle. The system comprises a power conditioning unit for applying a high voltage signal to a pulse generator after safety and security interlocks have been satisfied and a user actuated command received by the conditioning unit from a system control unit. The system control unit also generates a fire control trigger pulse for actuating the pulse generator and a oscillator trigger unit. After a predetermined time delay the trigger unit actuates an oscillator primed by the output of the pulse generator to transmit a series of pulses to a radiating system via an impedance matching transmission line. The radiating system radiates the EMPs having characteristics which will disable electronics in a target vehicle.

Abstract: First, second, and third power supply lines are separate from each other. A power supply circuit receives electric power from the first power supply line, and generates a given power supply voltage from the received electric power and outputs the generated power supply voltage to the third power supply line. An electronic circuit is connected to the third power supply line to be activated by the power supply voltage. The electronic circuit has an input section for receiving an input signal from the second power supply line. A protective circuit provided in the electronic circuit leaks a current from the input section of the electronic circuit toward the third power supply line when a voltage of the input signal exceeds the power supply voltage.

Abstract: This invention relates to a burglarproof key cylinder lock which comprises an outer tubular member, and an inner tubular member rotatably provided within the outer tubular member. A properly coded magnet key is inserted into the inner tubular member. The outer tubular member is provided with at least one switch member therein which is turned ON when a properly coded magnet key is inserted into the inner tubular member. An input signal discrimination circuit is provided for cutting off output signals to supply elements essential for the operation of an engine for a vehicle in case a key other than the properly coded key is inserted.

Abstract: A vehicle security system includes at least one sensor, a controller and at least one output device driver. The sensor has a rest state and a tripped state. The controller has an armed state and a disarmed state. The first output device driver transitions from its quiescent to its alarm state in response to the first sensor transitioning from its rest state to its trip state and the controller is in its armed state and furthermore when the ignition circuit is off. The first output device driver will remain in the quiescent state independently of the present state of the sensor if the ignition circuit is on and the controller is in its armed state. If the controller is in the disarm state, any activity by the sensor will not have any effect on the system.

Abstract: A vehicle security system has a combination lock type switch which controls engine starting and at least one other critical engine function; activates an alarm; and which causes an incapacitating substance, such as tear gas, to be introduced to the vehicle interior. The combination lock type switch controls appropriate solenoid valves and switches to accomplish the above purposes. This combination switch, a replenishing port, and a visible alarm are the only visible components. The remaining components are concealed behind the dashboard or beneath the floor of the vehicle.

Abstract: An electronic vehicle security system includes a valet switch and status indicator light combined into a single unit. The system includes a central controller having a plurality of sensors connected thereto. The sensors are located throughout the vehicle and generate signals to the controller when an intrusion attempt into the vehicle is detected. In response to these signals, the controller automatically activates an alarm device or an anti-theft device to deter the intruder from entering into or operating the vehicle. The system further includes a combined valet switch and status indicator light assembly. The assembly is adapted to be mounted on the dash panel of the vehicle and is connected through a single wiring harness to the central controller.

Abstract: A scheme for counteracting subsynchronous resonance in an AC power system that comprises a passive device in combination with a line inductive shunt reactor (L10). The device is connected from the neutral end (N) of the reactor (L10) to ground and comprises a plurality of circuit branches: one of those branches comprises a condenser (C10), another one includes an inductor (L12) in series with at least one tank circuit (C14, L14). The combination of these elements results in circuit paths from the AC line to ground of selected admittance values for at least one selected frequency as well as in a solid grounding of the shunt reactor neutral at synchronous frequency.

Abstract: A portable bar is provided which attaches and locks to a vehicle steering wheel, preferably attaching to and extending tangentially from the top of the rim, and extends to where it is fully visible from outside of the vehicle. In the preferred embodiment, the bar is a hollow tube in which a pair of clamping members, one being a fixed section of the tube and the other part hinged thereto, surrounds and is locked about the steering wheel rim. A cavity in the tube protectively encloses, along with anti-saw-through bars and/or mace, alarm circuitry and the batteries therefor. Light and sound annunciators on the bar and a LED armed-condition indicator, which preferably flashes only when dark, are provided. A panic button on the outside of the tube manually triggers the alarm. Push button selectors enclosed in the tube are accessible only when the device is unlocked to arm and disarm the alarm or function automatically by contact with the rim upon locking and unlocking thereto.

Abstract: The invention relates to a method and a circuit arrangement for preventing the oscillation of a radio frequency power module (IC1). According to the method of the invention a coupling element (Q7), preferably a bipolar transistor, which is made conductive when the input signal (IN) is removed, is installed between the input (IN) and the ground. The supply voltage (VS) in the power module can be permanently switched on.

Abstract: The described system prevents unauthorized operation of an automotive vehicle under the control of a separable engine control module (10) and signal source or memory device (12). A wire scrambler (22) and interface module (24) are interconnected between the engine control module (10) and memory device (12). A key device (20) having a fixed coded signal source (53) on being received within a lock cylinder (26) energizes a crossbar switch matrix (44) in the interface module (24) which effectively provides a correct wiring relationship between the engine control module (10) and the memory device (12). Connector parts (16, 30) are secured together in a manner that would destroy connector contacts if separated.

Abstract: The invention relates to a device for monitoring the closure of the opening points of a motor vehicle, in which each opening point is equipped with a closure contact which is connected to a central unit. It is characterized in that the central unit is connected to all the opening points by a single common line (8) with two conductors (31, 32), in that the central unit comprises at least one periodic-signal generator (28) connected to the said two conductors, in that each opening point comprises a passive receiver circuit tuned to the frequency of the periodic signal supplied by the said generator (28) of the central unit, the said passive circuit being connected in series with the closure contact of the said opening point, and in that the said device comprises, furthermore, indicia of a closure fault in response to the variations of the signal generated by the generator in response to the actuation of the corresponding closure contact.

Abstract: The invention relates to a device for the centrallized control of the opening points of a motor vehicle, in which the opening points have electrical actuators, including two locking states, and comprising at least one electric motor, and some opening points have a mechanically controlled device with a lock key sending commands to a central control unit which also receives commands coming particularly from the ignition key and/or from a remote-control set and from an anti-attack button.

Abstract: Microprocessor-controlled apparatus, for example, a car radio whose microprocessor (5) is one-time programmable by the manufacturer of the apparatus. An external non-volatile memory (7) comprises a security variable (VAR) indicating whether the protection means is operational. In addition to a security code (SC), an arbitrary code series (KEY) of, for example, 20 bits is stored in the internal memory (51) of the microprocessor. Unauthorized disabling of the protection means by external interrogation of the non-volatile memory is only possible by assigning a value which corresponds to the code series to the security variable. However, the code series is inaccessible and can only be traced with great difficulty by means of trial and error methods.

Abstract: A microprocessor controlled automobile security system provides several features for enhanced operability. The system allows a receiving unit to learn a plurality of operating codes from a plurality of uniquely coded transmitters with which it can operate, thereby allowing each transmitting unit to be sold separately from each receiving unit. The system also allows for an operator to personally set the threshold at which a signal detected by a shock detector will result in an alarm being triggered. The system is further selectively operable in either a manual arming mode or a passive arming mode. The system also allows selective operation in either a full current sensing mode in which either a detected shock above an absolute threshold or a .DELTA. threshold, or current flow above a predetermined level, will trigger an alarm system or operation in a shock and current integration mode in which if a detected current exceeding a predetermined threshold and a shock above an absolute or .DELTA.

Abstract: An a.c. machine (7) with, connected in parallel thereto, a capacitor bank (CR, CS, CT), which are fed by a converter (1-4) with a d.c. intermediate circuit, form a resonant system which is excited by the rectangular current of an inverter (4) of the converter. In this case, there is superimposition of the fundamentals and the normal harmonics in the machine voltage and in the machine current of an additional harmonic with the frequency of the resonance point. In the lower speed range of the a.c. machine (7), this excitation is eliminated by an optimum operating sequence of current gaps, which are generated inside a current block by means of a quenching circuit (3). Current gaps are generated at the start and end of each current block for the purpose of damping the 11th and 13th harmonic, and in the middle of the current block for the purpose of damping the 7th harmonic. A turn-on angle basic value signal (.alpha..sub.M) is modified by a turn-on angle differential signal (.DELTA..alpha..sub.

Abstract: A security system is provided for a mobile piece of equipment such as a freight car, aircraft, boat, automotive/truck vehicle, or other machine that may be stolen. The system consists of a central processing unit, transporting a stream of data to various components of the vehicle, and component control units attached to each of the parts of the vehicle being protected. The control units accept a code from the memory of the vehicle ignition key, alter the code, and transmit the altered code back to the CPU. The operation of certain devices that effect the operation of the vehicle and/or its protected subsystems are also disabled. These systems in turn may be linked to a central database via a system control center to control the inventory and regulation of parts both within each vehicle and between all vehicles protected by the system.

Abstract: A subsynchronous resonance mitigation system, including a method and apparatus, for damping undesirable subsynchronous resonance oscillations in a generator, which, if left unchecked, may damage the shafts of a turbine-generator set. A remote coupling apparatus, such as a thyristor controlled series capacitor (TCSC) system, a sourced inverter device, or a static phase shifter, is coupled to the generator by a transmission line. In response to a firing command, the coupling apparatus introduces subsynchronous resonance mitigating currents into the transmission line. Sensors monitor power line parameters and/or the generator speed, and in response thereto, a higher-level controller generates a voltage command. A vernier controller responds to the monitored power line parameters and the voltage command to provide the firing command to the coupling apparatus.

Abstract: An apparatus is provided for preventing unauthorized operation of an engine of a motorized vehicle having a cellular telephone whereby certain DTMF tones must be generated on the cellular telephone prior to the engine of a motor vehicle being operational.

Abstract: A device is disclosed for sensing the rotary angle of a key-actuated lock system which contains a lock cylinder of a door or flap of a vehicle which is rotatable by way of a key. A follower is coupled to the lock cylinder via a driving coupling allowing a free-wheel rotational play and to a protection element of a lock and is rotatably mounted in a door interior. A switch-actuating part is rotationally coupled to the lock cylinder virtually free of play and is rotatable synchronously with the lock cylinder and a control switch which is switchable by the switch-actuating part at a specific rotary angle of the part and directly spatially adjacent thereto. The switch-actuating part is mounted behind the follower in relation to the lock cylinder on a carrier facing the interior of the vehicle and is fixed to the door or flap. A control switch is retained at least indirectly on the same carrier, and at least these two parts are sealed off relative to the door interior.

Abstract: A motor vehicle including a central locking system as well as an anti-theft alarm system is controlled by a control unit common to both systems. The locked state and the unlocked state of all locks or doors of the motor vehicle are monitored by means of additional switching contacts and an activating of the alarm system is prevented if at least one of the locks is not in the locked state. An activating of the alarm ready state of the alarm system is nevertheless possible by operating a key-operated lock a certain number of times within a specific limited time period.

Abstract: A firing control scheme, including a method and apparatus, for secure vernier operation of a thyristor controlled series capacitor (TCSC) in series with a transmission line uses phase controlled firing based on monitored capacitor voltage and line current. The TCSC system has a thyristor switched inductive commutating circuit in parallel with the series capacitor. Vernier operation of the TCSC system is provided by predicting an upcoming firing angle for switching the commutating circuit to conduct a thyristor bypass current pulse therethrough. The current pulse causes an alternating offset component of voltage to appear across the series capacitor, in addition to the normal voltage component. Each current pulse changes the capacitor voltage proportionally to the integrated value of the current pulse.

Abstract: A series impedance compensation system for a set of transmission lines which are used for electrical power transmission, with these parallel lines being protected from the transient faults and dynamic subsynchronous oscillation problems. These problems can become aggravated by the introduction of capacitor banks which thus serve as only a partial solution to the disturbances of transient faults during conventional recovery modes of operation. The impedance compensation system is coupled in series to each transmission line to dynamically balance the inductor impedance on the transmission line, responsive to demand, by injecting a voltage component determined to be optimized substantially at quadrature leading or lagging phase angles (.+-.90.degree.) with respect to the transmission line voltage and current components.

Abstract: The vehicle is provided with a system able to simultaneously control all the mobile closure elements (windows installed in the doors, and possible sunroof). The system is conveniently activated by a switch element installed in the vehicle passenger compartment, and/or by the centralized vehicle door locking device. The system can simultaneously close all windows and a sunroof by the actuation of a switch while the ignition switch Is is turned on. The system can simultaneously close all windows and a sunroof, and additionally lock all the doors, by the continuous actuation of a different switch (either K1 or K2) for more than two seconds if the ignition switch is not turned on.

Abstract: A low powered RF receiver for receiving a modulated carrier having a coded transmission so as to remotely control a number of vehicular devices includes an antenna, a preamp stage, mixer, local oscillator, first and second IF bandpass filters, first and second IF amplifiers, a received signal strength indicator/detector circuit, and an adaptive threshold/filter circuitry. The signal strength indicator/detector circuit is interconnected between the first and second IF amplifiers and generates a strength indicator signal which is proportional to the strength of the modulated carrier signal received. The adaptive threshold/filter circuitry is responsive to the strength indicator signal and has a varied threshold reference level for eliminating noise and for converting the strength indicator signal to a logical level. A microcontroller is provided for further signal processing, decoding, and executing the function corresponding to the vehicular device to be controlled.

Abstract: A method and device for the electrical control of a central locking system and of a mechanical securing device (that provides additional lock protection) for motor vehicles by a lock cylinder that interacts with at least two control switches. This method and device ensures a better utilization of the electrical control switches, in that, an unlocking control switch assigned to the unlocking of the central locking system and the deactivation of the mechanical securing device is switched in addition to a locking control switch assigned to the locking of the central locking system. If the lock cylinder is pivoted in the locking direction beyond its regular locking position, the resultant joint switching state of the two switching control devices is evaluated to activate the mechanical securing device.

Abstract: A vehicle security system provided with a plurality of environmentally sensitive sensors determines the number of environmentally sensitive sensors that are activated, and generates an attack alarm signal when at least a predetermined number of environmentally sensitive sensors are activated, the predetermined number being greater than one, and generates a tamper alarm signal when a number of environmentally sensitive sensors less than the predetermined number are activated. In a system having one or more environmentally insensitive sensors and a plurality of environmentally sensitive sensors, an attack alarm signal is generated when an environmentally insensitive sensor is activated or at least a predetermined number of environmentally sensitive sensors are activated, the predetermined number being greater than one, and a tamper alarm signal is generated when no environmentally insensitive sensor is activated and a number of environmentally sensitive sensors less than the predetermined number are activated.

Abstract: An automobile anti-theft device capable of preventing access to the automobile's ignition wires from inside the passenger compartment. The prevention is accomplished by sealing the key switch and wire connectors in a metal compartment, protecting the ignition wires between the ignition switch and the engine compartment in an adjustable metal conduit, and clamping the ignition wires inside the engine compartment such that attempting to access the wires will disconnect the wires and make them inaccessible from the passenger compartment.

Abstract: A motorized vehicle anti-theft system which is passive by being automatically armed (i.e., does not require a vehicle occupant to set the system). Once power has been turned on to the vehicle, detection of an attempt to start the vehicle motor or the opening of a vehicle door (514) starts a predetermined time cycle (518). If a first reset signal is not received before the end of the time cycle, a vehicle disabling circuit is set (524). After that, a detection of actuation of the vehicle brake (526) will cause the disabling circuit to disable the vehicle (530) and set off an alarm (532). Only proper generation of the first and a second reset signal will allow the vehicle to be enabled again.

Abstract: A keyless lock system for a vehicle includes a card for transmitting a radio signal, at least one onboard antenna for receiving the radio signal, and a control unit for allowing and preventing keyless lock and unlock operations in dependence on the existence or nonexistence of the card in a predetermined area near the antenna. The control unit monitors the position of at least one monitored door, and produces a card warning signal each time the monitored door is closed if the card is absent in the vehicle.

Abstract: An automobile theft alarm apparatus for detecting the variation of the inclination angle of the automobile includes: a sensor of a bridge configuration mounted in the automobile for sensing the angle of inclination of the automobile; a differential amplifier for amplifying the output of the sensor; an offset compensating circuit which produces a reference voltage for the differential amplifier by comparing the output of the differential amplifier with a constant value and by then integrating the differential output; an alarm device for issuing an alarm when the output of the differential amplifier exceeds a predetermined value; and a switching device for increasing a time constant for making the total integration time constant for the offset compensating circuit larger than the time constant of the integrating elements thereof by intermittently supplying the output of the differential amplifier to the offset compensating circuit.

Abstract: An automobile electronic alarm device alternatingly produces an alarm sound signal and a speech sound signal when an attempt to burglarize or steal the automobile is made. The speech sound signal can correspond to a combination of the digits found in a license plate of the automobile so as to provide a distinct alarm sound output.

Abstract: A security system, particularly for a vehicle, comprises an electrical security key usable to make circuits which either directly, or through relays controlling other circuits, render operable electrical devices necessary for the starting of the engine of the vehicle by a conventional ignition key and switch. To confuse a person attempting to breach the security, conductors necessary to supply power to the devices are made discontinous within a wiring loom of the vehicle and other conductors are tapped-in at sides of the discontinuities and extend to relay contacts operable by the use of the key. Further to confuse such person, further conductors are connected to other relay contacts but have no operating function.