Abstract: A keyless entry system is presented for controlling a vehicle device function, such as the locking-unlocking functions of a vehicle door lock. The system includes a vehicle transceiver adapted to be mounted on a vehicle for transmitting an interrogation signal and also for receiving a coded reply signal and responding thereto for causing performance of a vehicle device function. The system also includes a plurality of portable remote transceivers, each of which receives an interrogation signal and responds thereto by transmitting a coded reply signal. The coded reply signals from different portable transceivers have different phase delays.

Abstract: A portable transceiver is provided for use with a remote keyless entry system for controlling the locking-unlocking functions of a motor vehicle door lock and causing performance of a vehicle function. The transceiver includes a signal receiver for, when turned on, receiving an interrogation signal and responding thereto by transmitting a coded reply signal requesting performance of a vehicle function. A power supply is carried by the portable transceiver for purposes of supplying operating power for use by the signal receiver. A timer and controller are arranged to turn-on transceiver operation for a predetermined period of time when an interrogation signal and timed power pulse are received concurrently.

Abstract: A vehicle transceiver is employed in a keyless entry system for gaining entry into a vehicle and also for starting the vehicle's engine. The transceiver includes means for providing a start engine signal representative that the vehicle's engine is to be started, a brake signal representative that the vehicle's brake pedal has been depressed and a seat occupied signal representative that an occupant is located in the vehicle's driver seat. In response to these three signals, the transceiver transmits an interrogation signal to a remote transceiver which responds with a reply signal. The reply signal from the remote transceiver includes a security code that uniquely identifies the remote transceiver from similar remote transceivers. The vehicle's transceiver stores a prestored security code representative of a remote transceiver that may validly gain entry into the vehicle.

Abstract: A remote keyless entry vehicle receiver includes a memory that stores a security code for uniquely identifying a transmitter that is authorized entry into the vehicle. The memory also stores a broadcast code that identifies a broadcast message intended for general use by a group of vehicles, each being equipped with a similar receiver. A signal is received which includes at least a coded portion. The received coded portion is compared with each of the codes that are stored in memory. Vehicle entry is permitted when the received signal includes a coded portion that matches the stored security code. The driver is alerted and/or provided with a message when the received signal includes a coded portion that matches the stored broadcast code.

Abstract: A remote control keyless security system for remotely controlling the locking and unlocking control functions of a lock mounted on a vehicle or the like. A receiver is mounted on a vehicle proximate to the lock to be controlled. A transmitter is located remote from the receiver and includes a plurality of selectively actuatable switches each representative of a control function to be performed by the lock and circuitry responsive to actuation of one of the switches for transmitting a digital signal including a first portion having a multi-bit security code uniquely identifying the transmitter from that of a plurality of similar transmitters, a multi-bit sequence control code adapted to be sequentially changed in response to each actuation of a switch and a multi-bit function code identifying one of a plurality of control functions to be performed by the lock.

Abstract: A remote control keyless security system is presented herein for remotely controlling locking means mounted on a vehicle. A receiver is mounted on a vehicle. A remote transmitter includes a plurality of switches each representative of a control function to be performed and circuitry responsive to actuation of one of the switches for transmitting a digital signal having a security code, a sequence control code adapted to be sequentially changed in response to each actuation of a switch and a function code. The transmitter changes the sequence control code after each operation with the change being dependent upon information contained in the security code. The received security code is compared with a stored receiver security code. Circuitry responds to each occurrence of a match between the security codes for reading a stored sequence control code and changing it to define an updated sequence control code having a value dependent upon information contained in the stored security code.

Abstract: A control circuit and method for using the same in operating a power switch such as a relay, FET, etc., having conductive and nonconductive conditions and adapted to direct a high magnitude driving current from a power supply through an electric load circuit when the power switch is in the conductive condition. Such a power switch can be used to control small motors used extensively in motor vehicles. This control circuit comprises testing means for directing a low magnitude, low duty cycle testing current through the load or motor circuit while the power switch is in the nonconductive condition, sensing means for creating a control signal indicative of a predetermined electrical characteristic, such as current flow, in the load circuit, means for shifting the power switch into the conductive condition for energizing the load when the control signal from the sensing means has a predetermined value, i.e.