Abstract: A brake master cylinder-sensor system and method are provided. The system includes a master cylinder, a piston slidably positioned in the master cylinder, a magnet positioned on the piston, and a sensor disposed on the master cylinder. A change of piston linear position causes a linear change in a magnetic field position sensed by the sensor, and a brake control signal proportional to the change of piston linear position is generated. A method of operating a brake master cylinder-sensor system includes applying a brake pedal force, changing a piston linear position within a master cylinder, determining a change in a linear magnetic field position proportional to the change of the piston linear position, and generating a brake control signal based on the change in the linear magnetic field position.

Abstract: A master cylinder assembly including a boost assembly. The hydraulic master cylinder includes a cylinder defining an elongated bore, a piston slidably positioned in said bore, inlet means in the cylinder for admitting hydraulic fluid into the bore from a reservoir, and an outlet fitting in said cylinder communicating with said bore and operative to convey hydraulic fluid out of the bore for delivery to a brake device in response to linear movement of the piston in the bore. The boost assembly includes an electric motor. A hollow ball nut and screw assembly is operably connected to the motor. A screw of the ball nut and screw assembly is positioned to advance the piston in response to actuation of the motor. An input rod extending through the screw includes a first end positioned to receive a brake input force and a second end positioned to advance the piston independently from the screw.

Abstract: Electronically controllable brake booster with a vacuum chamber and a pressure chamber, which are separated from one another by a moveable wall, a control valve arrangement, which can be actuated by means of an electromagnetic actuating device and via which a pressure difference between the pressure and the vacuum chamber can be set, wherein the control valve arrangement takes up a holding position, a pressure build-up position, a pressure reduction position in accordance with a current generated as correcting variable by an electronic control unit and flowing through the electromagnetic actuating device, a cylinder-piston arrangement, which is connected to the brake booster and comprises a piston, coupled to a brake pedal, of a hydraulic cylinder which has a hydraulic connection leading to a wheel brake, a sensor arrangement for detecting a signal which is correlated with the pressure of the hydraulic cylinder and which reproduces the controlled variable, wherein the electronic control unit establishes a com

Abstract: A master cylinder assembly including a boost assembly. The hydraulic master cylinder includes a cylinder defining an elongated bore, a piston slidably positioned in said bore, inlet means in the cylinder for admitting hydraulic fluid into the bore from a reservoir, and an outlet fitting in said cylinder communicating with said bore and operative to convey hydraulic fluid out of the bore for delivery to a brake device in response to linear movement of the piston in the bore. The boost assembly includes an electric motor. A hollow ball nut and screw assembly is operably connected to the motor. A screw of the ball nut and screw assembly is positioned to advance the piston in response to actuation of the motor. An input rod extending through the screw includes a first end positioned to receive a brake input force and a second end positioned to advance the piston independently from the screw.

Abstract: A displacement generator (10) has a housing (12) defining a chamber (14) containing an incompressible liquid (15). A port (22) of the housing (12) is closed by a movable member (24). Within the chamber (14), opposing, convex, flexible walls (16.1, 16.2) form an internal modulating chamber (18), which optionally contains a compressible gas. Opposed ends of the walls (16.1, 16.2) can be displaced toward and away from each other by a motion transducer, e.g. a stack of ceramic piezoelectric members (20), respectively to pressurize and depressurize the chamber (14) and thus to displace the member (24) to and fro to form an output of the displacement generator.

Abstract: The object of this invention is directed to an improved control system and actuator for a transfer case. More particularly, this invention is directed to a hydraulic actuator and control system for a transfer case. One aspect of the present invention provides a hydraulic control system for a transfer case that includes an actuator for generating fluid pressure. The system also includes an isolation valve and a control valve in fluid communication with the actuator. The isolation valve is in a normally closed position and the control valve is in a normally open position. The system further includes a piston for applying fluid pressure to a device of the transfer case. The invention further provides a method for controlling the hydraulic pressure to a transfer case.

Abstract: In a proportional booster valve V, a primary reaction piston 37 and a secondary reaction piston 38 are provided between a control piston 23 which faces at one end thereof toward a control pressure chamber 25 into which hydraulic pressure outputted from a primary master cylinder is inputted a boost pressure chambers 44 connected to secondary master cylinders, the primary reaction piston 37 being adapted to transmit at all times to the control piston 23 a reaction force corresponding to hydraulic pressure of the boost pressure chamber 44, the secondary reaction piston 38 being adapted to transmit to the control piston 23 a reaction force corresponding to the hydraulic pressure of the boost pressure chamber 44 as the hydraulic pressure of the boost pressure chamber 44 exceeds a set hydraulic pressure.

Abstract: Apparatus for compensating for positioning, pointing and/or orientation errors caused by deflections of structural members and components of a high performance machine or device and/or for reducing vibration inputs to such machine or device and/or for micro-positioning such machine or device so as to improve the operational performance of such machine or device. The apparatus utilizes one or more active-type actuators, such as piezoelectric ceramic type actuators, which are arranged in a predetermined manner relative to the machine or device. A servo control device operating in accordance with a predetermined algorithm may be utilized for controlling the actuators or, alternatively, the apparatus may operate in an open loop manner.

Abstract: The present invention provides a control booster which is capable of appropriately detecting a pedal-operated brake operation during an automatic brake operation. For moving a stop key from a position on a side of a rear-side abutment surface (where a reaction force of a switch acting on a switch operating rod and a spring force of a switch spring are balanced) toward an intermediate position, when the stop key is located on a side of the rear-side abutment surface, only a return force of the spring acts on a contact operating element of the switch. On the other hand, when the stop key moves toward the intermediate position, an abutment portion is separated from the contact operating element (that is, the switch operating rod moves in a direction for separation relative to the switch), so that no load is applied to the contact operating element.

Abstract: The present invention provides an actuator (20) for selectively displacing an output member (33) against an opposing load (L) in response to the output (24) of a motor (23). The actuator includes a first transmission mechanism (50) for displacing the output member relative to the motor at a first nominal ratio with respect to the motor output; a second transmission mechanism (60) for displacing the output member relative to the motor at a nominal second ratio with respect to the motor output; a selector (34, 39) for coupling the motor output to the output member only through the first transmission mechanism (50) when the load is less than a predetermined value, and for coupling the motor output to the output member through the first and second transmission mechanisms (50, 60) when the load is greater than the predetermined value. The force exerted by the output member on the load is the sum of the forces transmitted through the first and second transmission mechanisms.

Abstract: A brake booster pressure control apparatus is provided for controlling the vacuum pressure of a brake booster, the brake booster assisting a braking operation on a brake pedal by using an intake air pressure. The brake booster pressure control apparatus includes a brake-pedal vibration detecting unit that outputs a signal indicative of occurrence of vibrations of the brake pedal. A pressure control unit controls the pressure of the brake booster based on the signal output by the brake-pedal vibration detecting unit.

Abstract: The pump is connected on its delivery side through an auxiliary passage to a primary passage connecting the master cylinder and brake cylinder to each other, and a pressure control valve is provided in a portion of the primary passage between the master cylinder and a point of connection thereof to the auxiliary passage. The pressure control valve releases working fluid from the pump to the master cylinder when delivery pressure of the pump is higher than the master cylinder pressure by more than a predetermined amount, and the pump is activated when the fluid pressure generated in the brake cylinder is required to be higher than the master cylinder pressure, during brake operation.

Abstract: An electrically actuated hydraulic power cylinder for use in a vehicle braking system. The power cylinder includes an electric motor, a rotary-to-linear actuator for converting rotary motion of the electric motor to a linear motion, and a hydraulic cylinder. In a preferred embodiment, the rotary-to-linear actuator is a roller screw assembly. The roller screw assembly converts rotational motion generated by the motor into axial movement of a piston which is disposed within the hydraulic cylinder. The movement of the piston pressurizes a volume of fluid. The pressurized fluid flows through an outlet port connected to either a single wheel brake cylinder or a plurality of wheel brake cylinders, thereby actuating the associated wheel cylinder. In a specific embodiment of the invention, the roller screw assembly is incorporated into the internal structure of the motor for compactness and weight reduction.

Abstract: A brake power booster for automotive vehicles includes a control valve that is operable by an electromagnet irrespective of an actuating rod displacing a valve piston, the electromagnet actuating a third sealing seat which permits ventilation of the working chamber. The valve member of the control valve has passages which allow a pneumatic pressure compensation. To eliminate a pneumatic force component which counteracts the force generated by the electromagnet, the passages are provided radially outside the area delimited by the electromagnetically operable sealing seat on the sealing surface of the valve member.

Abstract: For an automatic hydraulic pressure generator in which a hydraulic master cylinder driven by a computer-controlled motor lets in or takes out a friction clutch, an operation device is provided that can make the piston rod of the hydraulic master cylinder operate at high torque and at high speed and further that is advantageous in durability of its conversion mechanism from rotary motion to linear motion.

Abstract: A variable pitch screw-driven system includes a rotatable drive screw powered by a motor actuator. A cam sleeve includes a nut section and is disposed about the drive screw and is linearly translatable in response to rotation of the drive screw. The cam sleeve includes a cam track with a fixed cam follower positioned to travel within a cam track. Linear translation of the cam sleeve is altered by tracking of the cam follower within the cam track such that rotation of the cam sleeve is effected simultaneously with rotation of the drive screw resulting in an effective variable pitch of the variable pitch screw-driven system wherein linear translation of the cam sleeve results from both rotation of the drive screw and rotation of the cam sleeve.

Abstract: A plurality of electrical fluid pressure control valves or a plurality of groups each comprised of a plurality of electrical fluid pressure control valves are operatively associated with respective power supply replays. The electrical fluid pressure control valves and a plurality of electrical switch valves are connected in parallel to a power source. A plurality of failure sensors are associated with the respective electrical fluid pressure control valves or the respective groups so as to detect whether an electrical system failure in any one of the electrical fluid pressure control valves or the groups occurs. If occurs, failure control unit is operable to control a corresponding one of the power supply relays so as to cause a corresponding one of the electrical switch valves to selectively connect a corresponding one of the wheel cylinders to a master cylinder.

Abstract: An electrohydraulic drive is provided. High-speed injection valves of hydraulic lift transformers have, for example, a pressure piston driven by a piezoelectric actuator and a reciprocating piston mounted in an axially displaceable fashion in a pressure piston bore and connected to the valve needle. The electrohydraulic drive has a piezoelectric actuator and a hydraulic force/travel transmission of compact design. To ensure the required axial symmetry of the drive despite production-induced tolerances, a balance element supported in a frustoconical depression of the pressure piston is arranged between the piezoelectric actuator and the lift transformer. During assembly of the hydraulics, the element having the form of a spherical segment and produced from high-grade steel can slide freely on the piezoceramic and thus compensate a nonconcentric alignment of the actuator and pressure piston.

Abstract: A vehicle brake system with an electronically controllable brake booster, comprising an actuation member (70, 80) transferring the actuation travel of a brake pedal to a master cylinder, which is allocated a travel limiting element (82) accepted between two abutment faces which limits the actuation travel of the actuation member (70), and a switching element (85) which upon an actuation movement of the actuation member (70) can be activated by one of the abutments (91, 91a) in order to issue a signal to the controller of the brake booster, with the travel limiting element being arranged on the actuation member (80) between two collars (83, 84), and a carrier (86) accepting the switching element (85) being arranged between the travel limiting element and one of the collars.

Abstract: A electrohydraulic stop device contains a piezoelectric actuator (P) which acts on two coupled hydraulic stroke transformers having identical transmission ratios. Essential components of the stop device are the pressure piston (DK) driven by the actuator (P), the lifting piston (HK) mounted axially displaceably in a cylindrical bore (ZY) of the pressure piston (DK), and a chamber (KB), into which open inflow and outflow ducts (B2, G2, B3, G3) for the medium to be shut off. By activating the actuator (P), the dumbbell-shaped lifting piston (HK) can be displaced virtually without delay in the pressure piston bore (ZY) and the inflow or outflow ducts (B2, B3) be closed.

Abstract: An apparatus for controlling the brake pressure in a vehicle brake system equipped with an electronically adjustable brake booster (10), comprising an actuator (22) which transmits the actuating movement of the brake pedal to a master brake cylinder and has assigned a path limiting element (80) which limits the axial actuating movement of the actuator (22) in that it is received between abutments (90, 92), the apparatus being characterized in that a switch is actuated by the path limiting element (80) together with one of the abutments (90), said switch supplying a signal to the brake booster when the path limiting element (80) abuts the one abutment (90).

Abstract: An electronic control type brake booster having a brake booster; an air path separately formed from a path to which an engine vacuum pressure of said brake booster is applied; a pressure control valve arranged in the air path and driven by a solenoid valve, said pressure control valve providing a pilot pressure to the air path of said brake booster to control the pressure in the air path to a pressure between atmospheric pressure and the engine vacuum pressure; a wrinkled bellows tube connected to a predetermined portion of said air path connected to the pressure control valve; an operational chamber inwardly formed of a movable wall communicated with the bellows tube; a plunger located at an inside portion of the movable wall and formed with an operational chamber and a further chamber according to an operation of the plunger; an annular element arranged between the plunger and the movable wall; and a hole formed at the upper portion of the annular element and communicating with the further chamber.

Abstract: A vehicle back-up safety device comprising a sensing system for detecting the presence of an obstruction within a prescribed area behind the vehicle while a user is driving in reverse. In response to a signal from the sensing system signifying the presence of a an obstruction, a control means activates a pair of electrically-motivated plunger assemblies to force fluid into the vehicle's brake line system, thereby activating the vehicle's brakes.

Abstract: Hydraulic braking system with slip control, comprises a working piston guided within the brake pressure generator, a booster piston of a hydraulic brake force booster for actuating the working piston, at least one wheel brake connected to the brake pressure generator and an electrically operable auxiliary pressure source adapted to be connected to the brake force booster, a control and regulating electronic unit for detecting the wheel rotating pattern and for controlling the wheel brake pressure by means of pressure modulating valves, and an electronic sensor means for detecting the relative movement between the push rod and the booster piston, the output signals of which sensor means are capable of influencing the operation of the auxiliary pressure source, wherein the auxiliary pressure source includes a quick-fill piston which is guided within a servo cylinder arranged on a servo drive.

Abstract: A brake-pressure modulation device in which a hydraulic unit, fitted with solenoid valves, with return pumps, accumulators and dampers of an anti-lock brake system also has a tandem brake master cylinder. The hydraulic unit has a housing with a standard location hole, into which four lip seals identical at least in their outside diameters are inserted. The lip seals hold a primary and a secondary piston of the tandem brake master cylinder. The use of four lip seals with the same outside diameter makes it possible to use the same housing with the standard location hole for different types of vehicle, even when the piston diameter and the operating stroke are changed.

Abstract: A variable screw-driven system includes a rotatable drive screw powered by a motor actuator. A nut is disposed about the drive screw and is linearly translatable in response to rotation of the drive screw. The nut carries a cam follower which travels within a cam track. Linear translation of the nut is altered by tracking of the cam following within the cam track such that rotation of the nut is effected simultaneously with rotation of the drive screw resulting in an effective variable pitch of the variable screw-driven system wherein linear translation of the nut results from both rotation of the drive screw and rotation of the nut.

Abstract: A motion control mechanism of the oil pressure cylinder comprises an oil storing cylinder, a driving rod and a reversible motor. The oil storing cylinder is in communication with the oil pressure cylinder having a piston rod and is provided therein with a piston which is provided at one end thereof with a coupling portion. The driving rod is provided at one end thereof with a connection head engageable with the coupling portion of the piston and is further provided therein axially with a threaded hole engageable with a threaded rod which is fastened at one end thereof with an output shaft of the reversible motor. The piston is actuated by the driving rod to move back and forth within the oil storing cylinder so as to control the motion of the piston rod of the oil pressure cylinder.

Abstract: An electronically controllable braking system for ground vehicles, comprising a cylinder/piston arrangement (6) which is able to introduce friction forces (F.sub.akt) into a friction element (8) which is coupled with a vehicle wheel by subjecting a hydraulic chamber (4) of the cylinder/piston arrangement (6) with hydraulic fluid, is developed further in that an electrically actuatable displacement element (12) projects into the hydraulic chamber (4) of the cylinder/piston arrangement (6) which is actuatable as a function of control signals from an electronic controller (22) for increasing or decreasing the pressure acting on the hydraulic fluid in the hydraulic chamber (4) in order to increase or decrease, respectively, the friction forces (F.sub.akt) which, during a braking operation, are introduced into the friction element (8).

Abstract: Compressed air is introduced into a cylinder chamber to displace a piston closely to a target position. Then, a ball screw shaft is rotated about its own axis by an electric motor to inch the piston to the target position. Upon arrival of the piston at the target position, the ball screw shaft is stopped by a brake mechanism to hold the piston accurately in the target position. The drive shaft of the electric motor extends parallel to the ball screw shaft, thus reducing the entire length of a servo cylinder apparatus. Solenoid-operated directional control valves, for supplying compressed air to the cylinder chamber and the brake mechanism are coupled integrally to a cylinder assembly, so that pipes are shortened for allowing the piston to be displaced and stopped quickly and accurately.

Abstract: A hydraulic braking pressure control apparatus for an automotive vehicle, having a master cylinder integrally provided with an ABS actuator or an ABS actuator and a TRC actuator, the ABS actuator being in the form of an anti-lock actuator which is activated under control of a computer for controlling hydraulic braking pressure applied to each road wheel of the vehicle in braking operation, and the TRC actuator being in the form of a traction control actuator which is activated under control of the computer for controlling slippage of driven road wheels during travel of the vehicle, wherein a solenoid valve assembly composed of a plurality of solenoid valves of the ABS actuator or the ABS and TRC actuators is mounted on one side of a cylinder body of the master cylinder, while other component parts of the ABS actuator or the ABS and TRC actuators are mounted within a housing structure integrally formed with the cylinder body of the master cylinder a the other side thereof.

Abstract: A vehicle brake system with a hydraulic brake booster. A booster pressure which is required for operating the brake booster is produced by throttling a flow of pressure medium which is supplied by a pump. For this purpose, a throttle valve is arranged between a pressure line which is connected to the pump and a return line which leads back to the pump, the adjustment of said pressure valve involves a building up of booster pressure in the pressure line by a solenoid, which booster pressure is applied to the brake booster. An electronic control unit which is connected to at least one sensor which outputs variable electric signal serves to control the throttle valve, the sensor detects activation of the brake pedal. For example, a pressure sensor which as a function of the boosting pressure supplies signals to the control unit which is developed to form a pressure controller and controls the throttle valve can be connected to the brake booster.

Abstract: The clutch actuation system provides for control of the clutch of a manual transmission in a motor vehicle. By use of an electric motor with mechanical linkage, hydraulics, a vacuum booster and a gradual pressure relief valve a smooth easy control of the manual transmission is accomplished. The vacuum booster provides an assist to the hydraulic system when the clutch must be disengaged. The gradual pressure relief valve provides for a smooth transition in the hydraulic system to engage and disengage the clutch. An engine RPM sensor is provided to prevent the disengagement of the transmission by the brake switch except at low engine RPM. The rapid smooth assist is aided by the vacuum system of the motor vehicle. For certain motor vehicles the engine oil system is also used to assist.

Abstract: An anti-lock brake system having an electronic control responsive to wheel speed sensors associated with each wheel of the vehicle. The electronic control generates a pedal inhibit signal activating a hydraulic cylinder to inhibit further depression of the brake foot pedal in response to detecting at least one of the wheels approaching a locked state. The electronic control will also generate brake pressure control signals activating an anti-lock brake actuator connected between the brake foot pedal and the input to the vacuum power booster of the brake system. The anti-lock brake actuator, in response to the brake pressure control signals, will maintain a maximum friction between the wheels of the vehicle and the road surface.

Abstract: A pressure boosting device as used in a vehicle brake system or other hydraulically operated system wherein the boosting device is connected to a mechanically operated pressure regulator for producing a manually controlled pressure, an electrically controlled pressure regulator and a hydraulically operated actuator, and includes a booster piston for boosting an electrically controlled pressure produced by the electrically controlled pressure regulator so that the boosted pressure is applied to the actuator, and a valve mechanism having an open and a closed position which are established when the booster piston is placed in its original position and moved away from the original position, respectively. In the open position, the actuator communicates with the mechanically operated pressure regulator. In the closed position, the actuator is disconnected from the mechanically operated pressure regulator, to permit the booster piston to boost the electrically controlled pressure.

Abstract: An arrangement for carrying out a two-stage linear movement with a stationary and a movable constructional unit, comprises a hydraulic cylinder and an hydraulic piston preferably in the form of a plunger. The hydraulic piston has a hollow volume which houses a plunger piston which, in turn, rests on a spindle rotated by a servomotor in the movable construct-ional unit. The plunger piston can be displaced axially in the hydraulic piston and also in the hydraulic cylinder by use of the spindle.

Abstract: A traction servomotor for supplying a control valve with an operational input independently of an operator pedal assembly in response to a signal supplied to a controller indicating a different rotational spin of the wheels of a vehicle. The traction servomotor has a housing with an input rod with a first section retained in axial openings in the housing and a second section is pivotally connected to the operator pedal assembly. The interior of the housing is divided by a diaphragm which is attached to the first portion of the input rod. The controller is connected to the housing such that in a first mode of operation wherein the activation of the control valve is dependent on an input from the operator pedal assembly a first fluid pressure is presented to both sides of the diaphragm and in a second mode of operation, a second fluid pressure is presented to one side of the diaphragm to create an actuation pressure differential.

Abstract: A brake control system for a vehicle in which a brake pressure is generated in accordance with a signal from an electronic control unit for applying the brake pressure to vehicle wheels, characterized in that a mechanical brake system is automatically actuated when an unexpected electrical fault has occurred in an electrical brake system.

Abstract: A braking system is provided which, in a preferred embodiment, includes a master cylinder having a bore with first and second diameters, a first piston slidably mounted within the master cylinder having a first periphery sealed with the bore first diameter and a second periphery sealed with the bore second diameter, the first piston establishing within the master cylinder bore a first pressure chamber between the first and second sealed peripheries and a second pressure chamber between the first piston second sealed periphery and the bore closed end, the first piston also having a central bore exposed to the second pressure chamber, first and second fluid lines joining the first and second pressure chambers with the wheel brake, a second piston slidably sealably inserted within the first piston bore, the second piston having a flange and having limiting displacement away from the bore closed end, a spring captured between the first piston and the second piston flange, a pressure sensor to determine the pressu

Abstract: A piezo-actuator's displacement magnifying mechanism includes a first cylinder and a second cylinder which is smaller in diameter than the first cylinder and communicates with the same. A plunger is slidably mounted in the first cylinder. The plunger is moved by a piezo-actuator in the first cylinder when a predetermined voltage is applied to the piezo-actuator to cause the same to expand and contract. A piston is slidably mounted in the second cylinder. A reservoir is communicating with the first cylinder. A hydraulic fluid is received in the first and the second cylinder and the reservoir. The hydraulic fluid is variable in viscosity in response to electric fields to which the fluid is subjected. A fluid passage is provided between the first cylinder and the reservoir for compensating for thermal expansion/contraction of the fluid. An electrode is provided for subjecting the hydraulic fluid to electric fields in the passage according to an instruction for applying the voltage to the piezo-actuator.

Abstract: A novel motor and method for converting rotary input motion to axial reciprocating motion of an output shaft in which input work and energy are transferred by creating unbalanced reaction forces with a motor driven unbalanced rotating mass as it acts on a pair of first pistons in direct communication with hydraulic fluid. The reaction forces created by the spinning unbalanced mass are converted to axial reciprocating motion by constraining the motion of the mass drive shaft, the supporting structure and the first pistons. A pair of second pistons, being integral with an output shaft, transfers oscillating pulses from the first pistons to a common output shaft where it can be applied to do work on an external system.

Abstract: A hydraulic engine apparatus and method that converts pulsed electromagnetic energy into mechanical force and motion. The engine apparatus produces usable mechanical power by pumping action made possible by a reciprocating piston in a cylinder acting on a fluid that is responsive to the pulsed electromagnetic energy. The cylinder is provided with check-valved input and output ports at both ends of the cylinder, which output ports are hydraulically coupled to a hydraulic motor for delivering mechanical power from the hydraulic motor's output drive shaft. The piston has embedded permanent magnets that coact with the pulsating electromagnets to produce the reciprocating action. The piston permanent magnet has prodruding ends which are received within central bore portions of core members of the electromagnets for producing increased magnetic pull.

Abstract: A hydraulic dual-circuit brake system has brake booster with a first output pressure chamber allocated to the front-axle brake circuit I and a second output pressure chamber allocated to the rear-axle brake circuit II. The chambers are movably delimited by master cylinder pistons, to each of which is allocated a position sensor. An electronic control device is provided to process the output signals of the position sensors and to emit control signals for a valve arrangement by which a brake circuit which is poorly bled or leaking is blocked off from its master brake line.

Abstract: If the driver of a vehicle becomes partially or totally incapacitated, the driver or a passenger can operate the push button of a ratcheting push button switch so as to close contacts which energize an air compressor whereby compressed air is supplied to an air cylinder adapted to actuate the existing brakes on the vehicle. A collapsible toggle linkage is connected between the brake pedal and the piston rod of the cylinder whereby the cylinder can operate the pedal without interfering with the normal operation of the pedal. Alternatively, a flexible cable is connected between the pedal and the air cylinder. As another alternative, an air cylinder is connected between the brake pedal and a pushable member for actuating the brakes. A collapsible toggle linkage is connected between the brake pedal and the body of the vehicle to limit return movement of the pedal.

Abstract: The invention relates to a motor vehicle braking system, comprising a brake pedal (P) to generate brake pressure in an hydraulic fluid, a brake pressure booster (12) operated by differential pressure and adapted to be actuated by a first valve (V.sub.1) which is pressurized mechanically by the brake pedal (P), and a first sensor (S.sub.1) to detect the pressure generated by the brake pedal. A second sensor (S.sub.R, S.sub.L) is provided to detect vehicle deceleration or rotational retardation of braked wheel, and a data processing unit serves to compare the data determined by the sensors (S.sub.1, S.sub.R, S.sub.L) and to generate a control signal in response to the result of the comparison for a second valve (V.sub.2) which is controllable electrically and by which a pressure difference is adjustable in the brake pressure booster (12).

Abstract: The invention concerns a vacuum-type booster comprising a case divided internally into a vacuum chamber and a working chamber by a piston comprising a valve mechanism possessing a double valve (20) enabling, in the rest postion, a communication between the two chambers which are then isolated from the environment and, in the working position, an isolation of the vacuum chamber and a communication between the working chamber and the environment at atmospheric pressure, this valve mechanism being normally controlled by an actuating rod (12) extending out of the case. According to the invention, it comprises, in addition, an electromechanical device (50, 52, 54) for controlling the valve mechanism independent of the actuating rod (12).

Abstract: A gas cylinder control system for use with machine systems such as die stamping systems that includes at least one gaseous fluid cylinder associated with the machine system, gaseous intensifier control cylinder normally operated in timed relation to the gaseous cylinder and a passage providing communication between the gaseous cylinder and the gaseous intensifier control cylinder. The gaseous intensifier cylinder operates at substantially higher pressure than the die cylinder. A normally closed control valve is provided in the passage and is operable to open the passage in time relation to the operation of the machine system in order to apply the higher gaseous pressure of the gaseous intensifier cylinder to the gaseous cylinder and lock the gaseous cylinder and prevent it from moving until the control valve is actuated to close the passage thereby providing a predetermined time delay.

Abstract: A system in which movement of a first member from a first position to a second position is translated through fluid in a fluid chamber to movement of a second member from a first position to a second position, the system having a pressure equalization line in communication with the fluid chamber allowing fluid to flow into the chamber when the second member is at its first position and out of the chamber when the second member nears the first position when returning from its second position towards its first position.

Abstract: A system for controlling a fluid pressure such a brake fluid pressure of a vehicle includes a pressure control cylinder having a control piston for varying a pressure of a confined fluid, and a motor for producing a mechanical force for actuating the control piston. To reduce the load of the motor, a hydraulic assist circuit is interposed between the motor and the control piston. The hydraulic assist circuit creates a hydraulic assist pressure by receiving the force of the motor, and converting the assist pressure into a linear motion of the control piston. The mechanical force of the motor is converted to hydraulic assist pressure through a pressurizing piston. The hydraulic assist pressure created by the pressurizing piston is exerted against a working piston. The working piston is connected to the control piston.

Abstract: A system for controlling a fluid pressure includes a pressure modulating cylinder unit having a piston and a cylinder housing defining first and second fluid chambers separated by the piston, a cutoff valve unit for isolating the first and second chambers from a pressure source and from each other, and a motor unit for pushing and pulling the piston to vary the fluid pressure in the first chamber. When the system is used for controlling a brake fluid pressure of a vehicle, the first chamber is connected with a wheel cylinder, and the valve unit is arranged to isolate the wheel cylinder and the first and second chambers from a master cylinder.

Abstract: A vehicle brake system with an electronically controllable brake booster, comprising an actuation member (70, 80) transferring the actuation travel of a brake pedal to a master cylinder, which is allocated a travel limiting element (82) accepted between two abutment faces which limits the actuation travel of the actuation member (70), and a switching element (85) which upon an actuation movement of the actuation member (70) can be activated by one of the abutments (91, 91a) in order to issue a signal to the controller of the brake booster, with the traveling limiting element being arranged on the actuation member (80) between two collars (83, 84), and a carrier (86) accepting the switching element (85) being arranged between the travel limiting element and one of the collars.