Abstract: A keyless entry system has a controller mounted on the vehicle which generates a radio signal for triggering a portable radio signal transmitter. The transmitter triggering radio signal of the controller contains a preset triggering code. The portable transmitter receives the transmitter triggering radio signal from the controller to compare the triggering code with a preset code to generate a transmitter identifying code containing radio signal when the triggering code matches the preset code in the portable transmitter. The controller receives the transmitter identifying code containing radio signal to compare the received code with a preset code to output a control signal for operating a preselected vehicle device when the received code matches the preset code in the controller.

Abstract: A method for detecting an encoded radio signal involves comparing the received signal amplitude with a predetermined threshold amplitude. The difference between the received signal-component amplitude and the noise-component amplitude is derived and used to adjust the threshold amplitude. By adjustng the threshold amplitude depending upon the difference between the signal-component amplitude and the noise-component amplitude, mis-detection which could occur otherwise when the reception amplitude of the noise component is relatively high or the reception amplitude of the signal component is relatively low can be successfully and satisfactorily avoided.

Abstract: A keyless entry system allows fully automatic operation of a door lock device of an automotive vehicle. The system recognizes the presence and absence of an authorized user and automatically locks or unlocks the vehicle door lock device according to the presence or absence of the authorized user. The keyless entry system is provided with a controller mounted on a vehicle and designed to periodically generate a radio demand signal and transmit same at regular intervals. A radio code signal transmitter is normally in a stand-by state in which it is ready to transmit a radio code signal indicative of a preset code in response to the radio demand signal. The radio code signal transmitter is of a pocket-portable size for convenient transport by an authorized user. The radio signal transmission between the controller and the radio code signal transmitter is performed within a predetermined distance range around the vehicle.

Abstract: An antenna for an automotive keyless entry system can ensure radio-wave transmission between a transmitter and a controller and can be conveniently mounted on a vehicle body. The antenna for an automotive keyless entry system, has a first planar antenna loop, and a second antenna loop disposed within the first antenna loop and lying in the plane thereof. The axis of the second antenna loop is substantially perpendicular to the axis of the first antenna loop. The first and second antenna loops form an antenna assembly which can be conveniently mounted on the vehicle body as, for example, within a door mirror of the vehicle.

Abstract: A process for producing an olefin copolymer rubber by slurry-polymerizing ethylene, at least one .alpha.-olefin and at least one non-conjugated diene in a poor solvent for the copolymer in the presence of a catalyst consisting of an organometallic compound (the first component) and a transition metal compound (the second component), characterized by using, an organoaluminum compound as the first component of the catalyst, and using, as the second component, a modified vanadium compound obtained by contacting a vanadium compound with at least one compound selected from the group consisting of the compounds represented by the following formulas: ##STR1## wherein R is a hydrocarbon group of 1 to 20 carbon atoms and X.sub.1, X.sub.2 and X.sub.3 are independently halogen atoms or alkoxyl groups. This process can prevent a gel from being formed during polymerization.

Abstract: A keyless entry system can lock and unlock an automotive vehicle door, a trunk lid, a glove box and/or a steering column without an ignition key. The system comprises a transmitter producing a radio signal indicative of a preset unique code, and a controller receiving the radio signal and performing desired locking or unlocking operation when the code from the transmitter matches a preset code. A manual switch is provided to order the transmitter to transmit the code-indicative radio signal to the controller. The controller is disabled when a preselected vehicle condition is detected, for example the ACC or ON position of an ignition switch or the presence of an ignition key in an ignition key hole.

Abstract: A process for producing an olefin copolymer rubber by slurry-polymerizing ethylene, at least one .alpha.-olefin and at least one non-conjugated diene in a poor solvent for the copolymer in the presence of a catalyst consisting of an organometallic compound (the first component) and a transition metal compound (the second component), characterized by using, an organoaluminum compound as the first component of the catalyst, and using, as the second component, a modified vanadium compound obtained by contacting a vanadium compound with at least one compound selected from the group consisting of the compounds represented by the following formulas: ##STR1## wherein R is a hydrocarbon group of 1 to 20 carbon atoms and X.sub.1, X.sub.2 and X.sub.3 are independently halogen atoms or alkoxyl groups. This process can prevent a gel from being formed during polymerization.

Abstract: A keyless entry system for an automotive vehicle allows operation of a vehicle device or devices without the need for an ignition key or other mechanical keys. A user can simply depress a single push-button or operate another suitable type of switch to activate the system and operate the desired vehicle device to the desired position. The system generally comprises a pocket-portable radio signal transmitter and a controller mounted on the vehicle and associated with the vehicle device. The transmitter has a small, long-life battery and the controller receives electric power from the vehicle battery. Power conservation for both the transmitter and the controller is achieved by activating them for limited periods in response to operation of the manual switch.

Abstract: A keyless entry system allows operation of various vehicle devices including a door lock without using a mechanical key, such as an ignition key. The system comprises a wireless, portable transmitter adapted to produce a radio signal indicative of a unique code preset in the transmitter, and a controller mounted on the vehicle and associated with the vehicle devices. The controller has a preset code to compare with the unique code indicative in the radio signal transmitted from the transmitter. The controller also detects impending or accomplished locking of the transmitter in the vehicle and produces an alarm and subsequently disables the keyless entry system unless the transmitter is removed from the vehicle within a given period of time after the alarm is given.

Abstract: A process for purifying a rubbery polymer by removing a catalyst residue from a rubbery polymer containing the catalyst residue obtained by polymerizing in slurry ethylene and an .alpha.-olefin or ethylene, an .alpha.-olefin and a non-conjugated diene in a poor solvent with a catalyst consisting of an organoaluminum compound and a transition metal compound, characterized in that the removal of the catalyst residue is conducted by water extraction consisting of(1) adding a good solvent and a surface active agent to the polymer slurry in the first step, and(2) adding water to the slurry obtained in above (1) in second step.This process enables the catalyst residue to be removed from EPDM in a very high efficiency.

Abstract: Disclosed herein is a rubber composition comprising at least 20% by weight of styrene-butadiene copolymer based on the total weight of the rubber content. The styrene-butadiene copolymer is obtained by randomly copolymerizing styrene with 1,3-butadiene in a hydrocarbon solvent in the presence of an organolithium compound as an initiator and then subjecting to a coupling reaction with a polyfunctional coupling agent, and contains 30-70% by weight of branched polymers therein, and has the following properties:(a) a content of bound styrene in the copolymer 3-15% by weight;(b) a content of vinyl bonds contained in the butadiene units is 15-30% by weight;(c) a Mooney viscosity (ML.sub.1+4.sup.100.degree. C.) is 15-50; and(d) a molecular weight distribution of the copolymer is bimodal at a ratio Mw/Mn of 1.4-2.2 in which Mw is a weight-average molecular weight and Mn is a number-average molecular weight.

Abstract: A rearward obstruction sensing system for an automotive vehicle detects obstructions within plural warning areas defined near the vehicle body. Four speakers near the four corners of the passenger compartment face toward the allocated warning areas when seen from the driver. When an obstruction is detected within a warning area, the speaker disposed on the side of the warning area within which the detected obstruction exists produces an intermittent alarm sound. Therefore, the driver can intuitively or sensorially recognize the direction of an obstruction existing within dead angles from the driver without watching a zone display device while backing up his vehicle. Further, the driver can determine the obstruction distance by distinguishing the period of the intermittent alarm sound, because the period thereof is proportional to the obstruction distance.

Abstract: A safe remote-control door opening-and-closing device for an automotive vehicle by which the door can not be opened or the door now being opened is closed, even if the driver operates the door open switch, in the case where there exists an obstruction within a predetermined warning region near the vehicle door or around the vehicle. The safe remote-control door device according to the present invention comprises an obstruction sensor for detecting the presence of an obstruction, if any, and a switching unit for disconnecting the door open switch from the door driving device or for connecting the door open switch to the reverse revolution terminal of the driving device in order to close the door now being opened, in addition to a conventional remote-control door opening-and-closing device.

Abstract: A device senses changes in a frequency or speed to be displayed. A display control circuit controls the time interval for updating the display, according to the magnitude of a sensed change in the frequency or speed, thereby avoiding flickering of the display, as well as improving the accuracy and up-to-dateness of the frequency or speed displayed.

Abstract: The digital display device of a vehicle is provided with a control facility for controlling other vehicle mounted electric equipment such as a warning device, an auto-door lock mechanism, or the like. The control is effected by using a control signal intended for turning on a particular segment of an indicating portion of the digital display indicator.

Abstract: A digital display type tachometer for an automobile for numerically displaying a rotation speed of the engine comprises a numeric character display device having display sections for 1000's, 100's, 10's and 1's digits, the 1's digit display section being constructed to display always "0", a counter for counting pulses generated in synchronism with the rotations of the engine to produce a BCD signal depending on the rotation speed, and decoding/driver means for decoding the BCD signal into decimal numeric character signals for 1000's, 100's and 10's digits and driving the 1000's, 100's, and 10's digit display sections by these character signals, respectively.