Abstract: A mover such as a vehicle acquires the information, which has been updated by broadcasting/communication during an engine stall or in an unreceivable state, after the engine start or the recovery of reception. The engine stall period and the unreceivable state continuation period of the mover are monitored and are notified after the engine start from a communication device to an information center and a mounted device. In response to this notification, the information center extracts the information, which has been updated during the engine stall period and the unreceivable state continuation period, and transmits the information to the communication device of the mover. As a result, the mover can always hold the latest information of a broadcast receiving device, the communication device and an information service device.

Abstract: A digital broadcast receiving antenna apparatus that, even when applied to a movable body, such as automobile or the like, can exhibit a high level of receiving characteristic. For this purpose, digital broadcast wave signals, which are received by four antennas, for example, disposed in rear quarter glasses and so tuned as to have nondirectivity, are in-phase combined by two in-phase combining circuits. The in-phase combined signals are then diversity combined by a diversity combining circuit constituting a receiver. In this way, a high level of receiving characteristic of digital broadcast waves can be obtained.

Abstract: A mover such as a vehicle acquires the information, which has been updated by broadcasting/communication during an engine stall or in an unreceivable state, after the engine start or the recovery of reception. The engine stall period and the unreceivable state continuation period of the mover are monitored and are notified after the engine start from a communication device to an information center and a mounted device. In response to this notification, the information center extracts the information, which has been updated during the engine stall period and the unreceivable state continuation period, and transmits the information to the communication device of the mover. As a result, the mover can always hold the latest information of a broadcast receiving device, the communication device and an information service device.

Abstract: There is provided a mobile unit communication apparatus which is to be mounted on a mobile unit to intermittently transmit an information signal of the mobile unit. The apparatus has detecting means for detecting various statuses of the mobile unit and a periphery of the mobile unit, as status data. Further, the apparatus also has transmission frequency controlling means, wherein a transmission frequency of an information signal which is intermittently transmitted is changed in accordance with the status data. Hence, in each of the mobile units, the load of processing information obtained from received radio waves can be reduced. Further, the driver can efficiently obtain adequate status information, so that the driving load on the driver can be reduced.

Abstract: A head-up display on a vehicle, which calls the attention of the driver or passenger to a dangerous object and makes the driver or passenger reliably recognize a communicated alarm, comprises: an image display device for displaying an image taken by a camera; a detecting device for detecting a target object; a switching device for manually switching between a display state and a warm-up state; and a warning device for outputting a control signal based on the detected result, thereby making the image display device display the image. The brightness for displaying the image according to the control signal is higher than the brightness for displaying the image according to a manual operation of the switching device.

Abstract: The object of the invention is to provide a mobile unit communication apparatus that can also efficiently acquire required information from another mobile unit in a place where multiple mobile units gather. To achieve the object, an identification code corresponding to a traveling azimuth of a mobile unit where a mobile unit communication apparatus is mounted is added to an information signal to be transmitted and the information signal is transmitted, an incoming information signal transmitted from another mobile unit is received and the information signal from another mobile unit is processed according to a traveling azimuth shown by an identification code added to the received information signal from another mobile unit.

Abstract: A head-up display on a vehicle is disclosed, which calls the attention of the driver or passenger to a dangerous object and makes the driver or passenger reliably recognize a communicated alarm. The head-up display comprises: an image display device for displaying an image taken by a camera; a detecting device for detecting a target object; a switching device for manually switching between a display state and a warm-up state; and a warning device for outputting a control signal based on the detected result, thereby making the image display device display the image. The brightness for displaying the image according to the control signal is higher than the brightness for displaying the image according to a manual operation of the switching device.

Abstract: The object of the invention is to provide a mobile unit communication apparatus that can give required information of one other mobile unit to another other mobile unit which a radio signal from the one other mobile unit does not directly reach. To achieve the object, an incoming information signal is received, it is judged based upon an information signal incoming when the approach of another plural mobile units near a mobile unit is detected based upon the incoming information signal that an error occurs in communication between another plural mobile units and an information signal to be transmitted between another plural mobile units is relayed when an error in communication between another plural mobile units is detected.

Abstract: An apparatus for calculating vehicle-wheel revolution estimated values detects parameters such as the number of vehicle-wheel revolutions and vehicle-wheel revolution speeds, detects differences between the previous estimated values and the detected parameters or other parameters such as vehicle-wheel revolution speeds and accelerations calculated from the detected parameters, stores the differences at a predetermined rate, determines variations, and updates the estimated values based on the determined variations. Since the variations are determined so that the increase rate of the variations decreases as the accumulated values of the differences increase, lag time is minimized and at the same time noise is eliminated, thus precisely estimating the revolution values of the vehicle wheels.

Abstract: In an apparatus for detecting the abnormality of a rotational speed sensor adapted for, for example, an anti-skid control system, a time period within which a subsequent pulse will be generated by the rotational speed sensor in response to the rotation of a body of revolution such as wheel is estimated on the basis of the latest pulse interval of the pulses previously generated therefrom and a value corresponding to the force of inertia of the wheel developed on the braking operation thereof. The determination of abnormality of the rotational speed sensor is made when the subsequent pulse is not produced within the estimated time period. This is arranged based on the fact that the pulse interval depends upon the inertial force of the wheel. With the above arrangement, the abnormality detection of the speed sensor can be quickly made, so that a fail-safe control in a braking system can be speedily performed in response to the occurrence of abnormality of the speed sensor.

Abstract: An antiskid control system is disclosed in which a single solenoid-operated switching valve connects a single wheel brake selectively to a high pressure or low pressure from a source of brake pressure. After the decompression of a wheel brake pressure, a repetitive intensifying operation is executed with a period of 40 msec in which an intensifying and a decompressing operation take place alternately. During the repetitive intensifying operation, the duty cycle for the intensifying operation is increased at a given rate. A flash intensification is executed immediately before the repetitive intensification. An initial value of the duty cycle for the repetitive intensification which occurs after the decompression of a second and a subsequent pass is chosen in proportion to the time duration of the previous repetitive intensifying operation and in inverse proportion to the immediately preceding decompressing interval.

Abstract: In an all-phase de-energized state of the stepping motor, all motor windings having different phases are energized. After the all-phase de-energized state is detected, the motor windings are sequentially energized in accordance with predetermined phase energization patterns. Each of the energizations of the motor windings lasts for a given interval chosen to allow the stepping motor to generate a starting torque greater than a maximal load torque. After energizations of the motor windings corresponding to one cycle of the phase energization patterns are completed, durations of the energizations of the motor windings are gradually shortened to increase a rotational speed of the stepping motor.

Abstract: A failure diagnosis system for a vehicle includes a failure detection means for detecting failures of devices or apparatuses installed in a vehicle, a storage means for storing failure information detected by the failure detection means, a failure display means for displaying failure information stored in the storage means, a time information means for adding failure information detected by the failure detection means and stored in the storage means to time information showing the time when the failure information is detected, a retrieval time input means for inputting a retrieval time and a selective display means for displaying selectively failure information which has time information being within the retrieval time.

Abstract: A wheel slipping control apparatus for controlling a braking hydraulic pressure to be applied to a wheel so as to perform an effective braking operation. The wheel slipping control apparatus comprises a control unit for generating a control signal in accordance with the wheel slipping state so as to perform a braking pressure control cycle so that the braking hydraulic pressure is set to a pressure decreasing mode and then to a pressure increasing mode. In the control unit, one of the braking pressure control cycles to be performed is determined as a learning control cycle to obtain a learning pressure-decreased value decremented in the learning control cycle and to obtain a learning pressure-increased value incremented in the learning control cycle.

Abstract: In an anti-skid control system for a motor vehicle there is provided a fail-safe control system for providing a compensation for a proper vehicle braking operation against the occurrence of failure of a hydraulic pressure control valve. The fail-safe control system includes a device for monitoring a control signal for controlling the operation of the control valve so that the hydraulic pressure applied to a wheel braking cylinder is regulated for preventing a wheel of the vehicle from skidding. The monitoring device detects the occurrence of failure of the control valve when the control signal indicative of one of the operation modes of the control valve is continuously generated more than a predetermined time period.

Abstract: Disclosed is an antiskid control system for a vehicle wherein the rotational acceleration of a wheel of the vehicle is detected and the rate of variation of the detected acceleration is detected upon the onset of speed reduction of the wheel. A pressure modulator, which is located in a hydraulic line between a master cylinder and a wheel cylinder, is responsive to the detected rate of variation of acceleration to provide a pressure relief action on the fluid pressurized by the master cylinder and supplies the modulated fluid to the wheel brake cylinder.

Abstract: A near rear suspension controller for a vehicle having a suspension between a vehicle body and a rear wheel includes: a front height detection section for measuring a distance between the vehicle body and a front wheel for generating a front height signal; a judgement section for generating a judgment result signal when the front height signal exceeds a predetermined range; and a rear height control section for increasing the rear vehicle height when it receives the judgment result signal.

Abstract: When a sporadic shock due to a protrusion or sinking of a road surface is detected at front wheels of a vehicle during its cruising on the road surface, the characteristic of the rear wheel suspension of the vehicle is immediately altered to improve the controllability and the stability of the vehicle or the feel of the ride thereof. For that purpose, a height sensor for detecting the distance between the body of the vehicle and each of the right and left front wheels thereof, a judgement section by which a front wheel vehicle height signal generated by the height sensor is compared with a predetermined reference range signal, and a controller for altering the characteristic of the rear wheel suspension of the vehicle depending on the result of the comparison are provided. In addition, a returning control of the characteristic of the suspension to the original state immediately after the rear wheels of the vehicle have passed over the protrusion or sinking which causes a sporadic shock may be performed.

Abstract: Present invention relates to an apparatus to improve the riding feel of the vehicle when the rear wheels pass over a sporadic hollows or protrusions of a ground by altering the rear suspension characteristic, i.e. the spring constant and the damping force of the shock absorbers after such hollows or protrusions are detected by front wheels of the vehicle passing thereover and the detected hollow or protrusion is judged to exceed a predetermined size. Besides that, the present invention has another control measures to give a priority to the maintenance of the vehicle posture when the driving condition is that need drivability and stability more than the riding comfort over the above-mentioned rear suspension characteristic alteration.

Abstract: When a sporadic shock due to a protrusion or dip of a road surface is detected at front wheels of a vehicle during its cruising on the road surface, the characteristic of the rear wheel suspension of the vehicle is altered immediately or just before the rear wheels pass it to improve the controllability and the stability of the vehicle or the smooth feeling of the ride. For that purpose, a rear suspension controller is invented which includes a height sensor for detecting the distance between the body of the vehicle and each of the right and left front wheels thereof, height data calculator which generates a plurality of height data from the front vehicle height, a judgement section which compares each of the height data with a respective reference value that is predetermined corresponding to each height datum and generates comparisons and a rear suspension characteristic alteration devices which alter the spring constant, damping force, etc. of the rear suspensions.