Abstract: A speaker apparatus includes a speaker unit, a passive radiator unit, and a front baffle on which the speaker unit and the passive radiator unit are mounted to form a portion of a speaker box and a back plate. A closed front chamber is formed by the front baffle for coupling the sound output generated from the back of the speaker unit with the passive radiator unit. A closed rear chamber is formed by the front baffle and the back plate for confining sound output generated from the front of the speaker unit. The speaker unit is disposed in a direction opposite to the direction of passive radiator unit, or in a direction approximately opposite.

Abstract: A sensed-pressure-data converter having a circuit for reducing a fluctuation of the output due to a fluctuation of a resistance and a resistance changing characteristic of a pressure sensitive resistance element and for reducing the output offset and offset drift of the pressure sensitive resistance element. The converter of the invention comprises a pressure sensitive resistance element (1), and a controller (2). The controller is an electric circuit connected to the pressure sensitive resistance element for detecting the electric characteristic of the element and includes A/D converters (3, 4), a D/A converter (6), and a memory (5). The controller compensates the electric characteristic due to a resistance change of the pressure sensitive resistance element and issues it from the D/A converter (6).

Abstract: The present invention aims at providing a rotation angle detector capable of detecting and storing information for a direction and an angle of rotation of steering wheel while maintaining a condition of reduced power consumption from a battery, when an engine is not running. In achieving the object, the invention discloses a structure, wherein the detector keeps a control means (8) including a memory unit (11) in a memory back-up mode when an ignition switch (7a), i.e.

Abstract: In the invented speaker system, a passive radiator 401 is mounted on a top board 403a of baffle 403 in a direction opposite to a speaker unit 402. The speaker unit 402 is mounted on the opening of a cylinder 403b protruding from top board 403a at a place inner from the end. The remaining part of the opening is closed with a sub-baffle 406, to form a front closed cavity 404 and a back closed cavity 405. In this way, both the passive radiator 401 and the speaker unit 402 are fixed to the top board 403a whose rigidity being the highest; which reduces the unwanted vibration.

Abstract: A cruise control system for maintaining the speed of a vehicle at a fixed, set speed, comprising an actuator including an electric motor which actuates a speed control member via an electromagnetic clutch. To ensure the capability of the cruise control system to decelerate the vehicle even when it is traveling a steep and long downhill, and the normal operation of the cruise control system becomes inadequate for curbing the excessive increase of the vehicle speed, the electromagnetic clutch is disengaged whereby the speed control member is returned to the position for maximum deceleration. Since the operation of the cruise control system is not canceled even when the vehicle speed is increased substantially beyond the set speed, the cruise control system can readily return to its normal operation even after the vehicle is accelerated from the state of cruise control by stepping on the accelerator pedal, for instance for passing another car.

Abstract: A collision detection system for a vehicle comprising an acceleration sensor for sensing the acceleration and deceleration of the vehicle wherein the acceleration sensor is a piezoelectric sensor; signal processing circuit coupled to the piezoelectric sensor for generating a first output when the vehicle deceleration is greater than a predetermined amount. A diagnostic pulse generator is coupled to the piezoelectric sensor for applying a diagnostic pulse to the piezoelectric sensor for distorting the piezoelectric sensor, thereby causing the piezoelectric sensor to generate an electrical output. The electrical output is applied to the signal processing circuit wherein the signal processing circuit produces a second output in response thereto.

Abstract: A vehicle cruise control system, comprising a control circuit for producing a control signal for maintaining a speed of a vehicle at a fixed level according to a difference between an actual vehicle speed and a target vehicle speed, and a drive circuit for producing a drive signal for selectively driving an actuator in a direction either to accelerate the vehicle or to decelerate the vehicle according to the control signal from the control circuit. The drive circuit is provided with a transistor bridge circuit comprising four drive transistors for producing the drive signal. The control circuit is provided with a detection means for detecting an abnormal state of the system and an inhibiting means which brings at least one of the drive transistors into an non-conductive state when any abnormal state is detected by the detecting means. The control circuit may be programmed to perform a certain diagnostic procedure for testing the soundness of the drive transistors.

Abstract: A speaker box for housing a radio speaker unit and intended for mounting within a vehicle door is formed of plastic by a monobloc molding method such as blow molding thus providing a seamless speaker box that is free from air leakage. The speaker box has an irregular configuration matching a space within the vehicle door, whereby it can be firmly secured in place maintaining maximum inner volume. The speaker box further has ribs extending across flat regions on the box thus improving its rigidity against vibration caused by sound pressure and the like.

Abstract: A vehicle cruise control system having an electric actuator for acting upon a throttle valve of a vehicle, a clutch for disconnecting the actuator from the throttle valve, a spring or the like for returning the output end of the clutch to a neutral state and a limit switch for detecting the limit of the motion of the output end of the clutch and discontinuing the supply of electric current to the actuator upon detection of the limit. Since the detection of the lower limit of the stroke of the actuator for decelerating the vehicle is necessary for preventing unnecessary supply of electric current to the actuator and overloading of the actuator, the closed state of the limit switch is tested by supplying an electric current to the actuator so as to decelerate the vehicle prior to starting the normal operation of the vehicle cruise control and determining if the electric current is indeed conducted through the actuator or not.

Abstract: A vehicular anti-theft system which combines a mechanical key and an electronic key involving a code light signal. A light emitting element is provided in a casing attached to a base end of the shank of the mechanical key while a light receiving element is provided adjacent to an open end of the key hole so that the conventional action of fitting the key shank into the key hole causes the transmission of a code light signal between these elements. Advantageously, the light emitting element can be additionally equipped with the function of locking and unlocking a vehicle door so that the user can obtain the benefits of both a remote control entry system and a highly effective anti-theft engine start system.

Abstract: A Karman vortex flowmeter has a column inserted in the fluid passage to produce a Karman vortex street corresponding to the velocity of a fluid and for measuring the flow rate of the fluid by making use of the variations in the pressure caused by the production of the Karman vortex street. A metal sheet member consists of a magnetic substance and includes a vibrating plate portion that is divided into two portions. Pressure transfer means in the column transmit the variations in the pressure to the vibrating plate portion for causing vibration at a rate related to the fluid flow rate.

Abstract: A light control apparatus for a vehicle is integrated with headlamp driving relays, a light sensor, a lighting switch which selects a manual mode or an automatic mode, and a control unit which controls the relays in accordance with the light sensor output when the lighting switch selects the automatic mode and turns on or off the headlamps. Two power source systems and two headlamp driving systems are provided. The signal level of a given terminal of the control unit is detected and is input to the microcomputer of the control unit. The microcomputer judges whether or not trouble has occurred by detecting a level difference. An alarm indication is given by a lamp or a buzzer if trouble is detected.

Abstract: A suction gas heater control device for an engine comprising first detector for detecting when the engine is brought into complete firing, and for providing a signal in response thereto; a first timer coupled to the output of the first detector for continuously providing a first operating signal for a predetermined period of time after a first period of time, the first period of time starting with the beginning of the inputting of a signal from the first detector and ending with the stopping of the signal from the first detector; a second detector for detecting engine temperature and for providing a second operating signal when the engine temperature is lower than a predetermined level; and a judgement circuit means coupled to the first timer and the second detector for providing a signal for operating a suction gas heater, when the first operating signal is applied thereto and when the second operating signal which indicates that at least one of the temperature of the engine is lower than a predetermined lev

Abstract: There is disclosed herein a generator control system for use in a power supply system for vehicles in which a battery and an engine-driven generator are connected in parallel with a load. The total load current fed to the load is detected and the generated voltage level is changed by performing field regulation for the generator in accordance with the detected value. Switching of the generated voltage level of the generator is controlled according to the state of the load applied so as to improve power generation efficiency. Certain parameters, such as battery state, engine speed, auto choke and load state, can be provided as an input or inputs to a voltage regulator for the generator.

Abstract: An operational condition control device for an internal combustion engine is provided which operates an alarm device when the engine temperature exceeds a predetermined temperature. The operational condition control device comprises a vehicle stop sensor for detecting a stopped condition of the vehicle, a temperature sensor for detecting the engine temperature, and a drive circuit for receiving signals from the sensors and operating the alarm device when the vehicle is in the stopped condition, and the engine temperature exceeds the predetermined temperature. In another aspect of the present invention, there is provided an operational condition control device for an internal combustion engine which operates a fuel cut device when the engine temperature exceeds a predetermined temperature and the vehicle is stopped to thereby stop the engine.

Abstract: An automatic light control apparatus for a vehicle comprises an external light detector for selectively turning on and turning off at least one of tail lamps, side marker lamps and head lamps of a vehicle in accordance with the detected external light. A further detector is provided for detecting the ON period of an illuminating light having a fluctuating light value (for example generated by an A.C. voltage source), and the lamps are further controlled in accordance with the detected ON period of the fluctuating light value in conjunction with the signals generated by the external light detector, for controlling the illumination of the lamps of the vehicle. A further detector may be provided for detecting an abrupt change in the illumination level, and for controlling the vehicle lamps further in accordance with the detected abrupt change.

Abstract: A power window of a vehicle is disclosed wherein a window motor adapted for opening and closing a window of the vehicle is connected to a power source through a window switch for opening and closing the window and a main switch adapted to to be opened and closed in accordance with the opened and closed states of an ignition switch for an engine of the vehicle. The power window of the vehicle is controlled by a window sensor for detecting whether the window is opened or closed and for generating an output signal when the window is open. A detection circuit generates an output signal when the window sensor generates the output signal and the main switch is opened and an auto-close circuit, actuated by the output signal from the detection circuit, operates the window motor in a direction to close the window.

Abstract: A mount for an earth magnetism sensor device for use in a bearing detecting apparatus which is to be provided on an automotive vehicle adapted to detect a horizontal component of the earth magnetism, characterized in that an axis of detecting a primary direction of the earth magnetism sensor means is offset in the horizontal direction in coincidence with an extent of magnetic declination at a given spot of observation with respect to a desired orientation by way of a map.

Abstract: In a vehicle provided with a turbine-type fuel flow meter for detecting the flow rate of fuel supplied to a carburetor of an internal combustion engine, a method for integrating the amount of fuel consumption which comprises the steps of summing the flow rate detected by the fuel flow meter at each prescribed time, comparing a quantity relating to the vehicle speed in a mean value at the prescribed time with a given reference value, selecting one from at least two prescribed correction factors based on the comparison and correcting the corresponding sum value of fuel flow rate by multiplying by the selected factor, and integrating the corrected value of fuel flow rate. With such method, error based on the moment of inertia in a runner of the fuel flow meter is substantially eliminated.

Abstract: A compact starting motor device for an engine of improved durability capable of ensuring a smooth and quick engagement of a pinion gear, operatively connected to an electric motor, with a driven gear of the engine upon actuation of an electromagnetic device without generating any substantial shock. The motor is connected through a one-way clutch to an output shaft so that a driving force is transmitted unidirectionally from the motor to the output shaft. The pinion gear is splined to a projecting end of the output shaft for relative axial movement and axially moved thereon to engage and disengage the driven gear by means of a rod which extends coaxially within the output shaft. The rod is connected through an over-load spring to the electromagnetic device having a stationary core and a movable core. A switch for energizing the electric motor is provided on the movable core.