摘要:
An antiskid apparatus provided in a communicating passage extending between a master cylinder and a brake cylinder in a brake system for a vehicle includes a flow rate control valve provided in a discharge passage which connects a pressure regulating chamber and a damping valve. The flow rate control valve includes a valve body having a flow path which defines a part of the discharge passage, and a valve member disposed in such a manner as to be reciprocal along the flow path. The valve member is normally separated from a valve seat formed on the valve body by the action of a spring in order to open the flow path. When subjected to pressure supplied from the pressure regulating chamber, the valve member is brought into contact with the valve seat to close the flow path. The valve member is provided with an orifice which provides communication between the flow path and a portion of the discharge passage on the side thereof which is closer to the pressure regulating chamber. Thus, the response of the flow rate control valve is improved, and it is possible to facilitate the production thereof and lower the production cost of the apparatus.
摘要:
An adaptive digital filter which is used, for instance, for a prediction filter in an ADPCM modulator and an ADPCM demodulator, for providing stable operation and minimum phase shift response. The filter (FIG. 4, FIG. 5) has three parallel branches (A,B,C), two (A,B) of them have a plurality of series connected non-recursive filter elements (A.sub.1 -A.sub.n, B.sub.1 -B.sub.n) each of which has degree not larger than three relating to an operator (Z.sup.-1), and third branch (C) is merely a conductive line. Tap coefficients (c.sub.1, c.sub.2, . . ., d.sub.1, d.sub.2, . . . ) of non-recursive filter elements change according to solutions of the transfer of the filter. A numerator and/or a denominator of the transfer function of the present filter is a Chebychev polynominal relating to an operator (Z.sup.-1), and has a zero point and/or a pole. The solutions (w.sub.i, v.sub.i) of a numerator and a denominator locate alternately on a unit circle (FIG. 6) on a Z.sup.-1 plane. When solutions of the transfer function do not locate alternately on said unit circle, tap coefficients (c.sub.1, c.sub.2, . . . , d.sub.1, d.sub.2, . . . ) are not updated, since non-alternate solutions do not assure stable operation and/or minimum phase shift response of the filter.
摘要:
An anti-skid device for use in a vehicle hydraulic brake system comprising a hydraulic pressure generating device for generating hydraulic pressure in response to actuation of a brake pedal, a brake cylinder for receiving the hydraulic pressure from the hydraulic pressure generating device and for applying brake force to a wheel of the vehicle, a passage through which the hydraulic pressure is adapted to be transmitted from the hydraulic pressure generating device to the brake cylinder, lock detecting device for detecting that a wheel is locked and a damping valve designed to function to interrupt the transmission of the hydraulic pressure from the hydraulic pressure generating device to the brake cylinder and to further reduce the pressure in the brake cylinder when the lock detecting mechanism detects that wheel is locked so that the wheel-lock may be released. The damping valve comprises a plunger movable such as to open and close a valve seat and a diaphragm for movably supporting the plunger and for liquid-tightly sealing a valve chamber defined around the valve seat. The plunger is integrated with the diaphragm by bonding and is provided at one end thereof with a valve body having a spherical surface portion for contacting the valve seat.
摘要:
An anti-skid device for use in a vehicle braking system and comprising a master cylinder for generating pressurized fluid in response to the actuation of a brake pedal, a reservoir supplying hydraulic fluid to the master cylinder, a deceleration detector for detecting the deceleration of a vehicle body the speed of which having been decreased in response to the actuation of the brake pedal, a first valve device for transmitting the fluid pressure generated in the master cylinder to a wheel brake cylinder in actuating the brake pedal and for intercepting the communication between the wheel cylinder and the master cylinder when the deceleration detector detects a predetermined amount of deceleration. The first valve device includes an expansion chamber normally filled by a predetermined amount of pressurized fluid, a dump valve communicating the expansion chamber with the reservoir when the deceleration detector detects the deceleration, and a pump device for pressurizing the expansion chamber. A second valve device is interposed between the first valve device and the reservoir and include a sensor for sensing the inclination of the vehicle such that when the vehicle is at a predetermined up-hill condition the second valve device closes to intercept the communication between the expansion chamber of the first valve device and the reservoir.
摘要:
An adaptive digital filter which is used, for instance, for a prediction filter in an ADPCM modulator and an ADPCM demodulator, for providing stable operation and minimum phase shift response has been found. The filter (FIG. 4, FIG. 5) has three parallel branches (A,B,C), two (A,B) of them have a plurality of series connected non-recursive filter elements (A.sub.1 -A.sub.n, B.sub.1 -B.sub.n) each of which has degree not larger than three relating to an operator (Z.sup.-1), and third branch (C) is merely a conductive line. Tap coefficients (c.sub.1, c.sub.2, . . . , d.sub.1, d.sub.2, . . . ) of non-recursive filter elements change according to solutions of the transfer function of the filter. A numerator and/or a denominator of the transfer function of the present filter is a Chebychev polynominal relating to an operator (Z.sup.-1), and has a zero point and/or a pole. The solutions (w.sub.i, v.sub.i) of a numerator and a denominator locate alternately on a unit circle (FIG. 6) on a Z.sup.-1 plane. When solutions of the transfer function do not locate alternately on said unit circle, tap coefficients (c.sub.1, c.sub.2, . . . , d.sub.1, d.sub.2, . . . ) are not updated, since non-alternate solutions do not assure stable operation and/or minimum phase shift response of the filter.
摘要:
A pneumatic booster includes a housing, a power piston and flexible diaphragm assembly partitioning the interior of the housing into two chambers, a poppet valve mechanism for selectively connecting or disconnecting communication between the two chambers and disconnecting or connecting communication between one of the chambers and a reference pressure, an input rod for actuating the poppet valve mechanism and an output rod connected to the power piston. The poppet valve mechanism includes a plunger connected to the inner end of the input rod, a valve member, a valve body having an axial bore therein for slidably receiving the plunger, and a restricting member mounted on the plunger for restricting the relative axial displacement of the plunger and the valve body. A resilient member is interposed between the restricting member and the valve body to avoid impacting abutment between the restricting member and the valve body.
摘要:
A pneumatic servo booster includes a shell housing consisting of front and rear shells, a valve body slidably extending through the rear shell, a flexible diaphragm cooperating with the valve body for partitioning the interior of the shell housing into front and rear chambers, a plunger connected to an input rod and being slidably fitted in the valve body, a valve mechanism including a poppet valve and two valve seats which are formed respectively on the valve body and the plunger, and at least one rigid rod secured respectively to the front and rear shells and extending through the front and rear chambers. The valve mechanism communicates the two chambers when the poppet valve is spaced from the valve seat of the valve body and is seated on the valve seat of the plunger. A return movement restricting member is slidably mounted on the rigid rod and engages with the plunger, and resiliently restricts the return movement of the plunger at the end of the return stroke of the input rod.
摘要:
A pneumatic servo booster includes a shell housing consisting of front and rear shells, a valve body slidably extending through an opening formed in the rear shell, a flexible diaphragm connected to the valve body and to the inner circumference of the shell housing to divide the interior of the housing into front and rear chambers, a valve mechanism incorporated in the valve body for controlling the pressure difference between the two chambers, and at least one reinforcing rod extending between front and rear shells and through the two chambers. The valve mechanism comprises a plunger slidably received in the valve body and connected to an input rod, a valve seat formed on the valve body, another valve seat formed on the plunger, and a poppet valve cooperating with the valve seats. A return movement restricting member is slidably mounted on the reinforcing rod and restricts the return movement of the plunger, thereby establishing the rearmost position of the plunger.
摘要:
A high frequency filter for frequencies higher than the VHF band comprising of a closed conductive housing (53), a pair of input and/or output means (54) like an antenna provided at both the extreme ends (53-5, 53-6) of said housing (53), a plurality of resonators (51-1 through 51-5, and 51a-1 through 51a-5) arranged on a straight line between said antennas (54), each of said resonators having an elongated inner conductor (51a-1 through 51a-5) with a circular cross section, and an elongated rectangular dielectric body (51-1 through 51-5) surrounding said inner conductor, one end of each of said resonators being fixed at the single plane (53-1) of the housing (53) and the other end of each of said resonators being free standing. The length of said inner conductor and the dielectric body is substantially 1/4 wavelength, and the duration (52-1 through 52-4 ) between two resonators is determined according to the specified coupling coefficient for the desired characteristics of the filter. Due to the rectangular dielectric body (51-1 through 51-5), each resonator is stably mounted on the housing (53), and then, the stable characteristics of the filter is obtained. Thus, the use in a vibrated circumstance like a mobile communication is possible. That rectangular dielectric body (51-1 through 51-5) also provides the larger coupling coefficients between resonators, and then, the wideband filter can be obtained.