Abstract: A brake fluid pressure control apparatus is disclosed which is capable of providing a good brake feel at the initial stage of pressure reapplication. The brake fluid pressure control apparatus comprises a pressure receiving device 25 and a valve mechanism 19 for closing a fluid passage 10 from a master cylinder 7 to wheel cylinders 8. The wheel cylinder fluid pressure is held by closing the fluid passage when the vehicle is brought to a halt with the brake applied, so that the vehicle can be held stationary if the driver takes his food off the brake pedal. When the pressure is to be applied again from the master cylinder 7, the pressure applied during the initial period of this reapplication of the master cylinder pressure is received by the pressure receiving device.

Abstract: An anti-lock control arrangement for a vehicle which employs a control map for effectively preventing a wheel lock during braking. The control map is defined in terms of acceleration-deceleration values of a vehicle speed, which is to be controlled, and a speed difference between a target speed and a vehicle speed. The control map is read during anti-lock operation to effectuate control of the brake hydraulic pressure.

Abstract: To dispense with a proportioning valve for the rear wheel brake fluid pressure line system of a brake anti-locking controller for a vehicle to reduce the cost of the controller. A brake fluid pressure controller comprises a controller for opening and closing the hold valves of a rear wheel brake fluid pressure line system at the time of brake fluid pressure increase after the start of braking of the vehicle but before the start of the brake anti-locking control thereof in order to keep the rate of the break fluid pressure increase in the rear wheel brake fluid pressure system lower than that of the brake fluid pressure increase in the front wheel brake fluid pressure line system.

Abstract: A fluid operated booster comprising a first valve for controlling the communication between an accumulator and a hydraulic pressure chamber, and a second valve for controlling the communication between the hydraulic pressure chamber and a reservoir, in which, a brake pedal rod is operated to close the second valve and to open the first valve, so that a hydraulic pressure is applied from the accumulator to the hydraulic pressure chamber to act on a power piston, to cause the power piston to provide an operating force, which is transmitted to a master cylinder piston to provide a boosted hydraulic pressure for a brake system; in which, according to the invention, the first valve is a spool valve which is mounted on the brake pedal rod with a predetermined frictional force in such a manner that the spool valve is movable a predetermined distance, and the first valve is closed when the brake system is not in operation, so that no hydraulic pressure from the accumulator is applied to the sliding portion of the bra

Abstract: A brake hydraulic pressure generator is provided which employs a first booster piston which applies a brake pedal treading force to a brake piston and a second booster piston which selectively additively increases the braking pedal treading force applied to the brake piston. The second booster piston is operated by hydraulic fluid pressure supplied from an auxiliary hydraulic pressure source.

Abstract: A hydraulic brake pressure generation apparatus which is provided with a pressure increasing valve apparatus, a fluid pressure increasing apparatus and a power valve. The pressure increasing valve apparatus receives a fluid pressure in a fluid pressure chamber of a master cylinder and then generates a fluid pressure the force of which is larger by a predetermined amount than the fluid pressure in the fluid pressure chamber.

Abstract: A hydraulic brake pressure control apparatus in which a relief valve is disposed in a fluid passage communicating a fluid pressure chamber of a master cylinder with an ejection end of a fluid pump for discharging a brake fluid to a reservoir when the brake fluid pressure in the fluid passage exceeds a predetermined value and the relief valve opens. An abutting direction of a valve member of the relief valve against a valve seat is the same as a discharging direction of the brake fluid during the opening operation of the relief valve.

Abstract: A brake hydraulic pressure control apparatus providing anti-lock control for preventing the locking of vehicle wheels during braking and providing traction control to prevent slipping of the vehicle wheels during starting or accelerating of the vehicle, comprises a master cylinder assembly, hydraulic passages within the master cylinder assembly, a distributor assembly removably attached to the master cylinder assembly. The distributor assembly includes a predetermined number of control channels for controlling vehicle wheels, a predetermined number of hydraulic passages, and a predetermined number of electromagnetic valves corresponding to the predetermined number of control channels. The electromagnetic valves are disposed in the hydraulic passages for performing the anti-lock and traction control on the vehicle wheels.

Abstract: A brake hydraulic pressure control apparatus providing anti-lock control for preventing the locking of vehicle wheels during braking and providing traction control to prevent slipping of the vehicle wheels during starting or accelerating of the vehicle, the apparatus comprises a master cylinder assembly including a body portion and an adaptor portion removably attached to an end of the body portion. A distributor assembly removably attached to the master cylinder assembly includes a predetermined number of control channels for controlling vehicle wheels and a predetermined number of electromagnetic valves corresponding to the predetermined number of control channels. The electromagnetic valves are disposed in hydraulic passages for performing anti-lock and traction control on the vehicle wheels. An anti-lock control electromagnetic valve having opposed ends is disposed between the body portion and the adaptor portion, wherein the anti-lock control valve includes a first and second ports.

Abstract: In a plunger-operated hydraulic pump, a cylinder has an ejection port extending from its upper end portion with an ejection valve provided at the ejection port. A piston and a plunger fitted in the cylinder are urged towards an eccentric cam by a first return spring and a second return spring which is stronger than the first return spring, respectively. The cylinder has a suction port in its lower end portion in such a manner that it is not closed by the plunger, so that the suction valve is opened by the downward stroke of the plunger, and during suction, the inflow resistance of the suction valve is minimized. Further, in the hydraulic pump, a plurality of cylinders are arranged at equal angular intervals so that the vibrations due to the reciprocations of the plungers are canceled by one another, thereby greatly suppressing the vibration of the cylinder block.

Abstract: A traction control system includes a control rod connected to a throttle lever and being slidable with respect to a housing to which an accelerator pedal is connected. The control rod is movable in response to a driving wheel acceleration slip signal so as to return the throttle lever. A control device controls the movement of the control rod. A set spring acts between the control rod and the housing. The set spring has such a spring force that the set spring is not compressed by the pressing-down of the accelerator pedal in the absence of the driving wheel acceleration slip signal, so that the control rod can be moved together with the housing. The spring force of the set spring is such that during the above movement of the control rod, the set spring is compressed when the accelerator pedal is strongly pressed down.

Abstract: An anti-lock control apparatus for a vehicle, comprising, a sensor for sensing wheel speeds of the vehicle, a braking system for braking the vehicle wheels, and a controller for controlling the braking system, according to an output of the wheel speeds sensors. The controller set a vehicle speed, a first and second threshold speeds, whereby the first and second threshold speeds follow over time the vehicle speed with a constant prescribed speed difference so as to satisfy the relation Vv>VT1>VT2, where Vv, VT1 and VT2 represent the vehicle speed, first and second threshold speeds, respectively.

Abstract: In a traction control system for motor vehicles, the design is made such that during traction control operation, detection is made as to whether both the left-hand and the right-hand driving wheel speed have become equal to or higher than a predetermined threshold value, and detection is also made as to whether one of the driving wheel speeds which is increasing and the other one of the driving wheel speeds which is decreasing, have crossed each other; when the results of such detections are both "YES", this is regarded as an indication that a hunting phenomenon is likely to occur, and in response thereto, buildup and reduction of the brake hydraulic pressure is restricted; during the restriction, detection is made as to whether both of the driving wheel speeds have become equal to or lower than the predetermined threshold value, the above-mentioned restriction is removed.

Abstract: In a traction control system for motor vehicles, a plurality of threshold values which are higher than the vehicle speed (equal to the non-driving wheel speed) are set up; the wheel speed as increasing or decreasing is compared with the above-mentioned plurality of threshold values to effect buildup or reduction of the brake fluid pressure; and holding of the brake fluid pressure is effected on the basis of a variation in the acceleration/deceleration of the driving wheel; in the case where the holding control mode in which the brake fluid pressure is held, persists for a predetermined time period or longer when the driving wheel speed is higher than a specific one of the above-mentioned plurality of threshold values, the holding control mode is switched to buildup control mode.

Abstract: A system in which the throttle wire of an automobile engine to be operated by the accelerator pedal is arranged to as well be used for controlling a traction is disclosed.Since the present invention is structured in such a manner that an accelerator pulley and a traction pulley are provided such that they can rotate, the accelerator pulley is arranged to be able to rotate in a first direction in which the throttle is opened by the accelerator wire connected to the accelerator pedal, while the traction pulley is arranged to be able to rotate in a second direction which is opposite to the first direction by an actuator with a traction cable, and the throttle connected to the throttle wire is returned by the rotation of the traction pulley in the second direction, the throttle can be returned to the closing direction as to reduce the engine output when detection of an acceleration slip is arisen at the start or during running of the automobile.

Abstract: An electromagnetic valve used in a hydraulic-pressure brake device, etc. is disclosed. The electromagnetic valve is so designed that the movement of its plungers is not hindered by the working liquid. Cylindrical members are arranged between the casing of the electromagnetic valve and its plungers, defining a bypass passage between the respective outer peripheral surfaces of the cylindrical members and the inner peripheral surface of the casing. With this structure, most of the liquid flowing with the opening/closing movement of valve members operatively connected to the plungers is allowed to flow through the bypass passage, thus making it possible to provide an electromagnetic valve having a high control responsiveness, without enlarging the size of the plungers.

Abstract: A hydraulic pump is disclosed, characterized in that, in the hydraulic pump including a cylinder body having a cylinder chamber, a suction port and an ejection port, a cam member and a reciprocatingly movable member are provided, wherein oil in said cylinder chamber is ejected when said movable member is pushed into said cylinder chamber by the cam member, a cylindrical piston is slidably fitted into said cylinder chamber, so that the movable member is engaged with the cylindrical piston when it is pushed into the cylinder chamber so shut off communication between the cylinder chamber and the suction port and a valve provided in the ejection passage communicating to said ejection port is opened due to the pressure rise when said movable member is further pushed into said cylinder chamber to eject the oil in the cylinder chamber outwardly.

Abstract: A hydraulic booster includes a power piston which is inserted slidably into a cylinder member and has a tip portion which is coupled to a piston of a master cylinder, a pressure chamber disposed in the rear of the power piston, a return valve provided in such a manner as to open and close a channel for connecting the pressure chamber to a reservoir, and a supply valve disposed in such a manner as to connect the pressure chamber to a high-pressure fluid source, a high-pressure fluid being introduced into the pressure chamber as the return valve is closed and the supply valve is opened. A valve sleeve is slidably inserted in the power piston and is urged rearwardly of the power piston by a spring, and a cam portion provided in the valve sleeve is employed to open and close the supply valve.

Abstract: Apparatus for controlling brake fluid pressure of a vehicle includes a hold valve provided in a first fluid passage so as to control fluid communication between a fluid pressure chamber in a master cylinder and a wheel cylinder, a decay valve provided in a second fluid passage so as to control fluid communication between a wheel cylinder and a reservoir; a supply valve provided in a third fluid passage so as to control the flow of brake fluid from a fluid pressure source to the fluid pressure chamber; an intake valve normally held in its closed position to shut off the third fluid passage, and a valve operating member mounted on the piston for movement therewith, the valve operating member being engageable with the intake valve when the stroke of movement of the piston reaches a predetermined value to thereby move the intake valve to its open position. With this construction, an anti-lock control for preventing the locking of the vehicle wheels can be effected.

Abstract: An anti-lock control device in a 2-channel diagonal brake composed of two individual brake lines, one controlling the front left and the rear right wheel, and the other the front right and the rear left wheel. When pressure reduction occurs in one brake line during anti-lock control, a cut valve closes the brake fluid passage to the rear wheel in the other brake line so as to retain the fluid pressure of the rear wheel at a constant value. Further, when one brake line fails to function, the cut valve for opening and closing the brake fluid passage to the rear wheel in the other brake line is put in a normally open condition.