Abstract: A bush assembly includes an inner cylindrical member for supporting an elongated member, a rigid sleeve slideably fixed to the outer surface of the inner cylindrical member via a slipping member, and an outer cylindrical member fixed to the outer surface of the rigid sleeve via an elastic member. The rigid sleeve has a greater diameter portion at one end thereof so that an annular space is formed between the greater diameter portion and one end of the inner cylindrical member. The bush assembly further includes a sealing member which is disposed in the annular space for preventing muddy water or the like from getting into the interfaces between the slipping member and the inner cylindrical member and between the slipping member and the rigid sleeve. The sealing member includes an outer portion fixed to the rigid sleeve, an inner portion being brought into contact with the inner cylindrical member, and an intermediate portion arranged therebetween.

Abstract: A system for measuring a flow rate of intake air introduced into an internal combustion engine for an automotive vehicle, includes a hot-wire type air flow meter which comprises a sensor portion having a ceramic bobbin and a heating member wound onto the ceramic bobbin, and a control circuit for controlling current passing through the heating element so as to a hold temperature of the heating element constant. The hot-wire type air flow meter monitors the flow rate of the intake air to produce a sensor signal representative of the flow rate. The system also includes a control unit which receives the sensor signal to compensate a response time lag of the sensor signal, particularly when the engine operates in a transient state, such as acceleration and deceleration.

Abstract: An exhaust particle removing system for an internal combustion engine includes two filters disposed within an exhaust passage in series for trapping particles suspended in exhaust gas. The system also includes combustion equipment which is disposed near the inlet of the upstream filter, and serves to burn off the particles deposited on the upstream filter. The downstream filter is coated with a catalyst. The downstream filter is arranged to be separate from the upstream filter by a predetermined distance so that the particles deposited on the downstream filter can be burned off by means of an elevated temperature of gas passing through the upstream filter. The length of each of the filters is essentially equal to or less than the diameter of the inlet of the respective filter.

Abstract: A fuel supply control system performs asynchronous fuel injection in response to acceleration demand for injecting a controlled amount of fuel irrespective of an engine revolution cycle. The amount of fuel for asynchronous injection in an engine transition state from engine decelerating state, in which fuel cut-off is performed, to engine acceleration state, is determined on the basis of a set value which is a latched fuel injection upon initiation of fuel cut-off operation, and an instantaneous fuel injection amount derived on the basis of the instantaneous fuel injection control parameters. The set value is modified in relation to an amount of fuel left on a periphery of an induction system.

Abstract: A speaker apparatus in which a speaker unit having a vibrating plate thereon is housed in a cabinet, an opening defined by the cabinet for radiating a sound generated at a front surface of the vibrating plate of the speaker unit is formed, and a shield plate over a predetermined part of the opening is provided for shielding the sound of a high frequency region in which peaks and/or dips are included due to the sound reflections in the cabinet.

Abstract: An air/fuel ratio control system for internal combustion engines performs .lambda. control by using .alpha. correction coefficients variable depending upon oxygen concentration in the exhaust gas. The system derives an average value of the .alpha. correction coefficients for a predetermined time after the engine enters an idling state while the engine driving condition satisfies a predetermined feedback control for performing .lambda. control, and modifies the average value by adding a predetermined value determined on the basis of an engine coolant temperature. The modified average value is set as a fixed value and is substituted for the .alpha. correction coefficient after the predetermined time elapses.

Abstract: A system and method for automatically controlling a vehicle speed to a desired cruise speed includes an inhibit switch connected in parallel to a line between a power supply and a main self hold power supply switch (self-hold type) of an automatic cruise controlling system. When the vehicle speed is below a predetermined value, the inhibit switch is open so that the automatic cruise speed controlling system cannot receive power via the main, switch. Thus, wasteful comsumption of power is reduced.

Abstract: A control system performs control for adjusting spring coefficient of an engine mount in order to set a resonance frequency out of a frequency band of vibration generated on a vehicular body due to roughness or undulation on a road surface. In order to enable this, vehicle driving parameters associated with the vehicle body vibration are monitored so as to perform control of the spring coefficient based thereupon.

Abstract: A bush assembly includes an inner cylindrical member for supporting an elongated member, a rigid sleeve slidably fixed to the outer surface of the inner cylindrical member via a slipping member, and an outer cylindrical member fixed to the outer surface of the rigid sleeve via an elastic member. The rigid sleeve has a greater diameter portion at one end thereof so that an annular space is formed between the greater diameter portion and one end of the inner cylindrical member. The bush assembly further includes a sealing member which is disposed in the annular space for preventing muddy water or the like from getting into the interfaces between the slipping member and the inner cylindrical member and between the slipping member and the rigid sleeve. The elastic member has a radially extending projection for interrupting muddy water or the like getting into the interface between the outer cylindrical member and a member which is to be connected another member via the bush assembly.

Abstract: An active suspension system utilizes an acceleration exerted on a vehicle body and a stroke magnitude in relative displacement between the vehicle body and a suspension member as parameters for controlling discharge rate of pressure medium fluid from a pressure source unit. The pressure source unit is normally driven at limited discharge rate for minimizing driving power consumption. The pressure source unit is responsive to the vertical acceleration greater than a predetermined acceleration criterion and to vertical stroke magnitude greater than a predetermined stroke criterion to increase discharge rate for compensating pressure medium fluid amount to be consumed for suspension control.

Abstract: A fuel concentration monitoring unit includes a fuel temperature dependent error correction circuit in the unit. A fuel concentration indicative voltage signal variation rate set with taking a specific fuel concentration as reference point. The output incorporated in the unit.

Abstract: In an exhaust emission control system for an internal combustion engine, a secondary air is selectively introduced into an exhaust passage at a first position upstream of a catalytic converter. A failure detection system utilizes a plurality of temperatures of an exhaust gas for detecting a failure of the exhaust emission control system. A first temperature is derived at a second position between the first position and the catalytic converter when the secondary air is introduced into the exhaust passage at the first position. A second temperature is derived at the second position when no secondary air is introduced into the exhaust passage at the first position. By comparing the first and second temperature, it is detected whether the exhaust emission control system includes a failure. Third and fourth temperatures may also be derived at a third position located inside or downstream of the catalytic converter, which respectively correspond to the first and second temperatures.

Abstract: A digital signal magnetic recording/reproducing apparatus converts a digital signal into a multi-value digital signal, followed by recording/reproducing the quadrature biphase modulated multi-value quadrature amplitude modulated signal. By using a multi-value quadrature amplitude modulation, a direct current component in the recorded signal can be eliminated, and the utilization efficiency of the recording frequency band of the digital signal magnetic recording/reproducing apparatus can be improved. Also, with respect to the amplitude non-linear characteristic which occurs in the magnetic recording/reproducing process, by providing a compensating circuit during the mapping before recording or after reproducing and demodulating, the deterioration of the S/N ratio of the reproduced and demodulated signal can be reduced to decrease the errors in the decoded data.

Abstract: A system for detecting deterioration of a catalyst monitors temperature of catalyst. The system sets a temperature criterion which represents possible lowest temperature when the catalyst is in a normal condition. Abnormality of the catalyst is detected by detecting the catalyst temperature lower than the temperature criterion.

Abstract: A cruise control system for an automotive vehicle with a manual or automatic transmission, includes an inhibition circuit. The inhibiting circuit blocks communication between a power supply and an actuator and/or a controller when the manual transmission is set in a predetermined gear or when the automatic transmission is set in a driving range other than the drive range, so as to inhibit the controller from operating in the cruise control mode. When the vehicle is provided with an automatic transmission which is selectively set in first, second, third or fourth gear while the shift lever is set in the drive range position, the cruise control system includes a first inhibiting circuit which blocks the communication when the shift lever is set in a position other than the drive range position, and a second inhibiting circuit which blocks the communication when the automatic transmission is set in either the first or second range while the shift lever is set in the drive range position.

Abstract: A CRT display system for a vehicle is provided, the system comprises a CRT for displaying images, vehicle information, or so forth, a liquid crystal panel assembly disposed in front of the CRT, a vehicle information sensor, and control means for the liquid crystal panel. The vehicle information sensor is adapted for determining whether the vehicle is running or not and whether an ambient light level is high or low to provide signals indicative thereof. The control means is operable to control the transmission factor of the liquid crystal panel so as to limit a visual angle for the driver in response to the signals output from the vehicle information sensor. When the ambient light level is low and the vehicle is running, the control means controls the liquid crystal panel assembly so as to reduce the transmission factor thereof to a first level with the result that no images from the CRT are projected to the driver through the panel assembly although passengers may clearly see the images.

Abstract: A flow rate sensor is provided. This sensor includes a flow rate detecting element. The flow rate detecting element is provided within a flow passage so as to expose the flow rate of a medium whether at the center of the passageway or at the inner surfaces of the passage wall. The flow rate detecting element has a plurality of openings for allowing the medium to pass therethrough without pressure loss. Thus, the flow rate sensor may precisely detect the flow rate of a medium flowing within the passage regardless of insecurity in the flow distribution of the medium.

Abstract: An actively controlled suspension system has two hydraulic systems for generating damping force against the vibration to be transmitted between a vehicle body and a suspension member. One of the hydraulic systems is designed for absorbing relatively high frequency vibration generally input from the suspension member for preventing vibration from the suspension member from being transmitted to the vehicle body. The other hydraulic system is active on relatively low frequency of vibration generally input from the vehicle body upon change of attitude of the vehicle body. The other hydraulic system generates a fluid pressure suppressing the attitude change. A pressure control valve and a fluid pressure source may be incorporated in the second hydraulic system so that they may not be active when aforementioned one of the hydraulic system is active.

Abstract: An anti-skid brake control system is provided with two wheel acceleration deriving circuits. A first wheel acceleration deriving circuit provides a timing for deriving wheel acceleration data with a relatively longer interval, which longer interval is long enough to obtain a good number of wheel speed data for deriving first wheel acceleration with satisfactorily high precision level. On the other hand, a second wheel acceleration deriving circuit provides a timing for deriving wheel acceleration data with a relatively shorter interval, which shorter interval is short enough for deriving wheel acceleration data with satisfactorily high response characteristics. The wheel acceleration data derived by the first wheel acceleration data is utilized in deteceting timing for switching operational mode of the anti-skid brake control system from an APPLICATION mode or RELEASE mode in which braking pressure is decreased to a HOLD mode in which braking pressure is maintained at constant value.

Abstract: A keyless entry system for providing controlled access is provided. This system includes a portable transmitter carried by an authorized person and a control system for controlling a locking mechanism. When locking or unlocking, the portable transmitter outputs an input signal to the control system. Upon receiving the input signal, the control system generates a request code signal for output to the portable transmitter. The request code signal generally includes a sequence of random code and an identification code. The control system further generates a particular code signal into which the random code is converted according to information indicated by a specific code stored in the control system. Simultaneously, in the portable transmitter, the random code is converted in the same manner by a user particular code signal equal to the particular code and is transmitted to the control system.