Abstract: A regenerative braking coordination device has a braking operating member receiving an input from a driver in the form of an operation amount, an input shaft operable for transmitting the operation amount, and a braking force boosting device operable to generate a hydraulic braking pressure corresponding to the operation amount transmitted by the input shaft. The device further includes a hydraulic pressure braking device to generate a braking force and an operation amount absorber for absorbing the operation amount of the input shaft. The operation amount absorber includes a cylinder, a piston dividing the interior of the cylinder into first and second hydraulic chambers and an orifice connecting the first and second hydraulic chambers. The orifice can be in the piston or in a flow channel.

Abstract: An automotive brake light switch mounted on a brake booster includes a housing defining a constant pressure chamber and a variable pressure chamber partitioned by a diaphragm, with a first through-hole of the housing, a second through-hole formed in the diaphragm and an air intake valve to allow the constant pressure chamber to selectively communicate with the variable pressure chamber, wherein the air intake valve is fitted into the second through-hole and configured to selectively open or close the first through-hole in response to a brake pedal, the brake light switch apparatus having a switch body, a switch rod slidably mounted to the switch body so as to turn on/off a switch of the switch body, wherein a protruding length of the switch rod is changeable by the air intake valve, and a coupling portion coupling the switch body to the housing through the first through-hole.

Abstract: In a method for controlling the pressure buildup in an electronically controllable brake system, preferably for use in motor vehicles, including a master brake cylinder, in particular a tandem master brake cylinder (TMC), a vacuum brake booster (booster), at least one additional pressure source for brake force assistance, preferably a hydraulic pump which is drivable by a controlling unit and the pressure of which can be applied to wheel brakes of the vehicle, an approach of a point where the auxiliary-force to actuating-force ratio (operating point) of the vacuum brake booster (booster) falls below a predetermined ratio is detected, that a pressure gradient in the master brake cylinder (TMC pressure gradient) is detected, and that in the event of a detected approach of the operating point of the booster and when a pressure gradient limit value of the detected TMC pressure gradient is exceeded, the additional pressure source is activated for brake force assistance, for the purpose of building up additional br

Abstract: The invention relates to a brake booster with a short operating travel, in which the three-way valve comprises a mobile valve seat borne by a sleeve (54). The movement of this sleeve is controlled by the piston. According to the invention, there is an elastic device (70) applying force to the sleeve (54) in the direction of the front of the booster, and tending to move this sleeve forward with respect to the pneumatic piston (12). In addition, there is a device for transmitting the pressure of the master cylinder (120) to the sleeve (54) and that tends to apply a rearward force to the sleeve (54).

Abstract: A control unit of a brake apparatus includes a compensation braking force controlling device for controlling a compensation braking force in response to an operation of a brake operating member so that a characteristic of a total braking force relative to the operation of the brake operating member agrees with a predetermined target characteristic. The total braking force is a sum of the compensation braking force containing a pressurizing hydraulic braking force based upon at least the pressurization and a basic hydraulic pressure braking force based upon the basic hydraulic pressure. The compensation braking force controlling device includes: a judging device for judging whether the vehicle has stopped, and a limiting device for limiting the amount of pressurization via a pressure control valve when the judging device determines that the vehicle has stopped.

Abstract: The invention relates to a braking device for a motor vehicle fitted with an air conditioning circuit (K), this braking device comprising a source of fluid (F1) at a relatively high pressure, a source of fluid (F2) at a relatively low pressure, and a pneumatic brake booster (F3) selectively connected to one or other of the sources of fluid (F1, F2). According to the invention, the source of fluid (F1) at a relatively high pressure comprises a portion (KC1) of the air conditioning circuit (K) that is placed downstream of the air conditioning compressor (K1) and upstream of the air conditioning expansion valve (K2), in one direction of flow (X) of the cooling fluid in the air conditioning circuit (K).

Abstract: A device (100) for assembling a pneumatic booster (200) wherein a cover (203) of the booster is housed in a support (101) and a cylindrical cap (104) whose internal volume (107) is greater than a volume of a cylinder (206) of the booster, covers the cylinder placed on the cover. A gearing element (110) of the device rotates two sets of rollers (109A and 109B) about the booster and an eccentric (118) controlled by the gearing element allows an oscillating movement of the rollers against a wall of the booster. The swaging is achieved by alternately applying the rollers (109A) and (109B) and an angle of attack (114A) of the first rollers is greater than an angle of attack (114B) of the second rollers.

Abstract: The brake actuation device of a motor vehicle brake system includes a pneumatic brake booster 1, the interior of which is subdivided into at least one vacuum chamber and one working chamber, a master brake cylinder 2 and a pneumatic motor-and-pump assembly 3 for providing the vacuum in the vacuum chamber, which has a vacuum pump 6 and a motor 7 driving the vacuum pump 6. A vacuum level in the vacuum chamber or a difference in pressure between the vacuum chamber and the working chamber is sensed using a sensor 9, and the motor-and-pump assembly 3 is enabled by an electronic control unit 12 when the vacuum falls below a first defined bottom vacuum level Pe in the vacuum chamber and is disabled when a second defined top vacuum level Pa is reached. The rotational speed np of the motor-and-pump assembly 3 is controlled depending on driving conditions of the vehicle.

Abstract: The present invention relates to an internal combustion engine (1) of the Otto type, comprising an induction pipe (3) in conjunction with the engine's (1) cylinders, a brake servo unit (15), a flow connection (29) for evacuating air from the brake servo unit (15) to the induction pipe (3) for the purpose of building up a vacuum inside the brake servo unit (15), in conjunction with which a Venturi unit (25) is arranged in the flow connection (17, 19) to assist with the building up of the aforementioned vacuum. The internal combustion engine is characterized in that the flow connection (17, 19) comprises a bypass line (29) having a lower flow resistance than the Venturi unit (25), the bypass line (29) being intended to connect the evacuated air past the Venturi unit (25) in the event of a transient vacuum in the induction pipe (3).

Abstract: A hydraulic brake system for a motor vehicle supplies pressurized brake fluid to a wheel brake in response to a demand signal. The brake system includes a master cylinder in fluid communication with the wheel brake to control the actuation thereof. Furthermore, actuation of the master cylinder is controlled and/or amplified by first and second pressure-amplifying mechanisms, which are electrically controlled by an electrical control unit.

Abstract: A vacuum pressure booster has a booster shell; a booster piston; a valve cylinder including: a valve piston; an input rod; a control valve; and an input return spring, and the control valve including: an annular vacuum pressure introducing valve seat; an atmosphere introducing valve seat; a valve body including: an annular attaching bead portion; an expansion cylinder portion; and an annular valve portion; and a valve spring, wherein the attaching bead portion is tightly held by a pair of cylindrical holding portions formed in a pair of valve holders attached to the valve cylinder, and the diameter of the holding portion is smaller than the inner diameter of the valve cylinder.

Abstract: In a method of controlling a hydraulic vehicle brake system with active hydraulic brake force boosting, wherein the driver can introduce brake pressure into a master brake cylinder with an actuating device, wherein the pressure introduced by the driver is boosted by an active hydraulic pressure increasing unit, a braking request or a suspected braking request of the driver is determined and, when a braking request or a suspected braking request of the driver is detected, a separating valve that is arranged in a line connecting the master brake cylinder and the hydraulic pressure increasing unit is opened or remains open and the pressure increasing unit is actuated for pressure generation purposes.

Abstract: Master cylinder assembly (1) for hydraulic control includes a master cylinder body (2) having a longitudinal bore (3). A piston (6) is arranged in the said bore and includes a seal packing (15) separating two chambers (16, 29) adapted to contain a liquid. The piston also includes a recovery conduit (36) connecting the chambers and by-passes the seal packing, and a valve (38). When the piston is in a rest position, an actuator (54) adjusts the position of the valve between an open position opening the recovery conduit and a closed position closing the recovery conduit.

Abstract: The invention relates to a brake booster with a short operating travel, in which the three-way valve comprises a mobile valve seat borne by a sleeve (54). The movement of this sleeve is controlled by the piston. According to the invention, there is an elastic device (70) applying force to the sleeve (54) in the direction of the front of the booster, and tending to move this sleeve forward with respect to the pneumatic piston (12). In addition, there is a device for transmitting the pressure of the master cylinder (120) to the sleeve (54) and that tends to apply a rearward force to the sleeve (54).

Abstract: A control system for a brake vacuum pump, the system being capable of accumulating a negative pressure required for a vacuum chamber, without excessively operating the vacuum pump. In this system, an EGI_ECU determines whether a vehicle has experienced running at a speed equal to or higher than a preset creep vehicle speed after the startup of an engine. The EGI_ECU prohibits the operation of the vacuum pump until the time when the vehicle experiences running at a speed equal to or higher than the creep vehicle speed. Thereby, in a situation obviously not requiring a strong braking force, such as in a stopped state immediately after the startup of the engine, the operation of the vacuum pump can be prohibited, which allows the vacuum pump to be accurately prevented from an unnecessary drive.

Abstract: In a vacuum type brake booster, the reaction of output transmitted from an output shaft to a reaction member is transmitted to a valve body, a plunger, and a stepped pin. A valve mechanism, which is assembled to an axial hole of the valve body, includes an atmospheric valve seat which advances and retreats together with the plunger, a vacuum valve seat assembled to the valve body to advance and retreat, and a valve member having an atmospheric valve portion which forms an atmospheric valve in cooperation with the atmospheric valve seat and a vacuum valve portion which forms a vacuum valve in cooperation with the vacuum valve seat. The stepped pin is pushed rearward when a corresponding portion of the rear surface of the reaction member deforms and bulges rearward, and pushes the vacuum valve seat rearward in relation to the valve body.

Abstract: A vehicle brake device A is provided with a master cylinder 10 for generating a fluid pressure depending on the stepping state of a brake pedal 11 and a differential pressure control valve 43 constituted by a solenoid valve of the type that has two ports 43a, 43b and is capable of controlling the differential pressure between the both ports 43a and 43b. The differential pressure control valve 43 is connected at its port 43a to an outlet port 10a of the master cylinder 10. An ECU 70 controls the differential pressure control valve 43 to generate a controlled differential pressure corresponding to the pedal operation state of the brake pedal 11 between the both ports 43a and 43b. Thus, according to the vehicle brake device A, it can be realized to obtain a pedal feeling which is smooth without suffering any delay in response, to easily alter a reaction force property of the brake pedal for any of various vehicle models, and to decrease in cost as well as dimension.

Abstract: A system for vacuum booster assist including a vacuum booster having an input and an output, a brake pedal connected to the input of the vacuum booster, a brake pedal travel sensor positioned to monitor travel of the brake pedal, a master cylinder having an input and an output, the input of the master cylinder being connected to the output of the vacuum booster, a master cylinder pressure sensor connection to the master cylinder to monitor a fluid pressure in the master cylinder, a brake fluid pressurizing device in fluid communication with the output of the master cylinder, and a controller in communication with the brake pedal travel sensor, the master cylinder pressure sensor and the brake fluid pressurizing device, wherein the controller is adapted to communicate a command signal to the brake fluid pressurizing device based upon signals received from the brake pedal travel sensor and the master cylinder pressure sensor.

Abstract: A braking device for a motor vehicle having a first brake circuit (10) with a master cylinder (11) controlled by a brake pedal (12), a second brake circuit (20) with at least one pump (27) that is controlled by a computer (C), and a pedal travel simulation mechanism (40). The simulation mechanism (40) includes a solenoid valve (41) that is mounted in a pipe (42) connected to a hydraulic fluid storage chamber (43) and controlled by the computer (C) so as to allow the brake fluid to flow toward the chamber (43) when the second brake circuit (20) is active and when the driver presses on the brake pedal. The pipe (42) is also connected to another pipe (44) in which hydraulic fluid is displaced by a first part (45) of a control rod connected to the brake pedal (12) and second part (46) associated with the master cylinder (11).

Abstract: A method for providing brake boosting in a hybrid motor vehicle having a brake boosting system powered by an internal combustion engine and by an auxiliary brake boosting device includes monitoring the output of an auxiliary brake boosting device not driven by the engine, and in the event that the auxiliary brake boosting device is not operating properly, starting the internal combustion engine associated with the vehicle to provide a desired level of brake boost.

Abstract: In a brake system for a hybrid motor vehicle, while it is set to pure electric drive mode, the crankshaft of the combustion engine is driven temporarily with the aid of at least one electric motor for generating reduced pressure in the intake manifold for supplying reduced pressure of the additional vacuum reservoir to the vacuum chamber of its brake booster only when, during or following the single or multiple actuation of the brake pedal thereof, the reduced pressure in the vacuum reservoir of the brake booster drops to a predeterminable lower limit or falls below the lower limit.

Abstract: A negative pressure supply apparatus for brake booster, arranged to supply an intake-pipe negative pressure in an engine intake system to a brake booster mounted in a vehicle, comprises a negative pressure supply part communicated with a bypass passage which allows part of air flowing in the intake pipe to bypass the intake pipe and supplies the intake-pipe negative pressure to the brake booster; an air ejector part placed in the bypass passage to increase the intake-pipe negative pressure and supply the increased negative pressure to the brake booster; and an open/close device including a temperature-sensitive medium, the device being placed in the bypass passage upstream of the air ejector part and configured to open and close the bypass passage.

Abstract: In a method for determining or calibrating the brake control characteristic of a vacuum brake booster of a vehicle brake system, the pressure in the working chamber or the pressure difference between the working chamber and the vacuum chamber of the vacuum brake booster is determined, and either the brake control characteristic is determined on the basis of the determined pressure or pressure difference of the vacuum brake booster, or the stored brake control characteristic is changed according to the determined pressure or pressure difference.

Abstract: A vacuum booster which moderates a retraction speed of a valve seat member to restrain a contact noise between a key member retracting in a unitary manner with the valve seat member and a flange surface of a plunger. The vacuum booster includes a noise restriction device.

Abstract: This brake hydraulic pressure control apparatus adopts, as the pressure-increasing valve, a normally-open linear solenoid valve that can linearly adjust the actual differential pressure. This apparatus repeatedly executes, in principle, a control cycle in which a pressure-reducing control, holding control and linear pressure-increasing control make one set, after ABS control start conditions are satisfied (after time t1). In this case, a pulse pressure-increasing control is executed instead of the linear pressure-increasing control only in the first-time control cycle (time t3 to t6).

Abstract: A pneumatic brake booster for a motor vehicle, comprising a piston (22) mounted between a control rod (24) actuated by a brake pedal and a push rod (34) actuating a piston of a brake master cylinder. Structure for increasing brake boosting during an emergency braking, comprising a cylindrical sleeve (46) mounted in an axially sliding and sealed manner inside the piston (22). The sleeve being retained in the rest position by locking arrangement (58) and released to push away the shutter (56) of a three-way valve and increase the supply of atmospheric air to the booster when the control rod (24) is moved at a speed that is greater than a predetermined value.

Abstract: A boosted brake for actuating a primary piston (54) of a master cylinder through a feeler and a reaction disk having a decompression piston (62) that is elastically returned by a spring (70). The decompression piston (62) has at least two radial branches (64) that are housed in the primary piston (54) of the master cylinder to provide two boost ratios that differ according to the intensity of an input force applied by an operator to effect a brake application.

Abstract: An algorithm residing in, for example the ECM of a motor vehicle, which predicts brake booster vacuum for vehicles using vacuum for brake pedal assist. The predicted brake booster vacuum is compared to a calibrated brake booster vacuum threshold to determine if adequate brake booster vacuum is available to meet vehicle braking requirements, whereupon engine operation can be modified, as necessary, to improve intake manifold vacuum such that brake booster vacuum requirements for vehicle braking are better satisfied.

Abstract: A boosted brake (10) having a booster (12) for activating a primary piston (54) of a master cylinder (14) by way of a feeler (42), a reaction disk (28) and a push rod (52). The push rod (52) that is housed a decompression piston (62) and returned elastically by a spring (70) to a position of rest has at least two radial branches (64) in order to provide two boost ratios which differ according to the intensity of the input force.

Abstract: A calibration process for a pneumatic-assistance servomotor in a braking circuit of a motor vehicle. The values of the output pressure (Pmc) of a hydraulic master cylinder associated with the servomotor and of the negative pressure inside the working chamber of the servomotor are measured and recorded with respect to a given negative-pressure value (Pfc) inside a negative-pressure chamber of a servomotor for several operating points P1, P2, P3, P4 of the servomtotor. The operating points being located on either side of a saturation point to precisely determine the coordinates of the saturation point and thereby provide an accurate control of advanced functions of the servomotor with respect to braking operation, the braking assistance and/or the monitoring of the performance or of the ageing of the servomotor.

Abstract: An algorithm residing in, for example the ECM of a motor vehicle, which predicts brake booster vacuum for vehicles using vacuum for brake pedal assist. The predicted brake booster vacuum is compared to a calibrated brake booster vacuum threshold to determine if adequate brake booster vacuum is available to meet vehicle braking requirements, whereupon engine operation can be modified, as necessary, to improve intake manifold vacuum such that brake booster vacuum requirements for vehicle braking are better satisfied.

Abstract: In a negative pressure boosting device of the present invention, upon depression of a pedal at a normal speed, an input shaft 11 and a valve plunger 10 move forward to close a vacuum valve 15 and open an atmospheric valve 16 and a power piston 5, a valve body 4, and an output shaft 24 move forward. In the initial stage of operation, hooks 27c and 31a are not engaged with each other so that a cylindrical member 27 does not move forward, thereby shortening the stroke of the input shaft 11 as compared to a conventional one. Upon rapid depression of the pedal, a press face 10a presses a pressed face 27e so as to deform an engaging arm portion 27b, thereby disengaging the hooks 27c and 31a from each other. The cylindrical member 27 is moved backward by a spring 30 to push a vacuum valve portion 12b so that the atmospheric valve portion 12a is spaced apart from the atmospheric valve seat 14 more rapidly than that of the service braking, thereby increasing the jumping amount and thus rapidly intensifying the output.

Abstract: In a vacuum booster in which a reaction force mechanism is interposed between an input rod and a valve cylinder connected integrally with a booster piston, and an output rod, a valve piston is fitted onto an input piston connecting the input rod and the reaction force mechanism to be slidably movable forward from a predetermined retreat position with respect to the input piston, the valve piston is biased to the retreat position by a set spring, and locking device is provided between the valve piston and the valve cylinder to lock the valve piston at the valve cylinder thereby holding an atmosphere introduction valve seat in an open state at the time of emergency braking when the input piston moves forward by a predetermined number of strokes ahead of the valve cylinder. Thus, while a delay in atmosphere introduction into the operating chamber is eliminated irrespective of normal braking or emergency braking, the output is allowed to reach a servo limit point earlier and held at the time of emergency braking.

Abstract: A vacuum booster which moderates a retraction speed of a valve seat member to restrain a contact noise between a key member retracting in a unitary manner with the valve seat member and a flange surface of a plunger. The vacuum booster includes a noise restriction device.

Abstract: A pneumatic-hydraulic hybrid pneumatic brake booster is improved. Additional hydraulic boosting (19, 20) provided by a hydraulic circuit is provided beyond a saturation point (Psat) in the operation of the pneumatic circuit. Hysteresis-induced instabilities in the pneumatic part of the booster are taken into consideration (50). A choice is made to compensate (A) for the shortfall in operation of the pneumatic circuit using the hydraulic circuit. In one example, this correction is afforded via a microprocessor which imposes a corrected process signal. Using this signal, pressure shifts in the pneumatic system are neutralized.

Abstract: A pneumatic brake booster for use in a motor vehicle having a feeler (42) mounted to slide on a plunger (32) located at the end of a control rod (22) and pivoting key (62) for axially blocking the movement of the feeler (42) with respect to the plunger (32) during a normal brake application and unblocking the movement during an emergency brake application to reduce the length of a plunger-feeler assembly and thus increase the jump phase of an output force.

Abstract: A spacer for positioned a boost unit in an engine compartment of a vehicle. The spacer is defined by a wall located between a front face and a rear face, bearing surfaces, an axial opening with a flange thereon, ribs that extend from the flange to define a plurality of radial slots, an axial slot that extends from the front face toward the rear face and a peripheral slot that connects the axial slot with the engine compartment. A base of a boot that surrounds a hub on the boost unit engages the front face to define a flow path from the engine compartment to the hub. Tabs on the spacer assure that the front face is aligned with the base while the radial ribs prevent the base from engaging the wall to assure that the size of flow path remains constant during the communication of air to the hub.

Abstract: A brake booster having a housing is separated into a first chamber and a second chamber by a wall connected to a hub. The hub has a cylindrical body with an axial bore that retains a control valve for sequentially connecting the first chamber with the second chamber to provide for the equalization of fluid pressure therein to define a first mode of operation and interrupting communication between the first and second chambers while connecting the second chamber to a surrounding environment to allow air to enter into the second chamber and create a pressure differential across the wall to defining a second mode of operation. The pressure differential acts on the wall to develop an output force that pressurize fluid to effect a brake application. The brake booster is characterized by a first input member responsive to a manual input and a second input member responsive to an ECU for moving the control valve from the first mode to the second mode to respectively develop first and second brake applications.

Abstract: A method and system for ensuring reliable operation of a brake booster system for a vehicle braking system in which a pressure value prevailing in the brake pressure reservoir of the brake booster system is sensed by a pressure sensor. An error occurring in the brake booster system is detected by evaluating the sensed pressure value prevailing in the brake pressure reservoir as a function of the actuation of the brake actuating mechanism. The brake booster system includes a diagnostic circuit that is connected to the pressure sensor and to the brake actuating mechanism.

Abstract: A pneumatic brake booster (10) of the type comprising a moving piston (22) urging an actuating rod (34) of a master cylinder (28) in response to actuation of a plunger (56) of which a front end, passing through the piston (22) and forming a first feeler (62) can, when the plunger (56) is in the extreme position, penetrate a reaction disc (44) inserted between the piston (22) and the actuating rod (34) to transmit to the plunger (56) the reaction force of the master cylinder (28), characterized in that it comprises a second feeler (68) which can, when the control rod (46) is actuated at a rate higher than a determined rate, be pushed by the plunger (56) and immobilized by a one-way engagement device (70) in an axial position that varies with respect to the piston (22), then be driven by the piston to push the second feeler (68) into the disc (44) so that the first feeler (52) applies a braking force more rapidly.

Abstract: In a vacuum brake booster of a vehicle braking system, comprising a vacuum housing that is subdivided by at least one movable partition into at least one vacuum chamber and at least one working chamber, comprising a sensor unit adapted to sense the pressure in the vacuum chamber and the pressure in the working chamber or the difference in pressure between the working chamber and the vacuum chamber, an electronic control unit is associated with the vacuum brake booster and includes an evaluation unit for the purpose of evaluating the sensed pressures in the vacuum chamber and the working chamber or the difference in pressure between the working chamber and the vacuum chamber. The electronic control unit includes an actuation unit for the purpose of actuating an active hydraulic brake force boosting unit on the basis of the evaluation by the evaluation unit.

Abstract: Pneumatic brake-booster with additional hydraulic boosting and method for boosting braking using such a booster.

Abstract: The pressure in an underpressure store of a pneumatically operated servo system is controlled by a method wherein the underpressure store is charged with an underpressure via a suction line. A higher desired pressure for the underpressure store is pregiven in a rest state of the servo system wherein the system is not actuated and no actuation is expected. A lower desired pressure for the underpressure store is preset in a state wherein the servo system is actuated or an actuation is expected.

Abstract: The vehicle motion control system includes an automatic hydraulic pressure generator generating a hydraulic pressure irrespective of a brake pedal operation and a hydraulic pressure control valve adjusting the hydraulic brake pressure by opening or blocking a connection between the automatic hydraulic pressure generator and a wheel brake cylinder. The system includes vacuum pressure detecting means to adjust the hydraulic brake pressure in a appropriate condition. In response to the vacuum pressure detecting means, vehicle motion is controlled in the direction that the vehicle motion control is restricted under the vacuum pressure which drives said vacuum booster is relatively small. Also, the duration of the hydraulic brake pressure increase is controlled in the direction longer under the vacuum pressure which drives said vacuum booster is relatively small.

Abstract: The invention relates to a pneumatic-hydraulic brake system with a pneumatic/hydraulic converter which converts a pressure that is pneumatically input by the driver into a hydraulic brake pressure. A sensor is provided which detects a physical variable that gets adjusted in the converter when the pneumatic pressure is input. The sensor generates a warning signal when a pre-given variable is detected.

Abstract: Vehicle braking system including a vacuum booster for transmitting a boosted brake operating force to a master cylinder such that the boosting ratio is reduced at a fixed transition point before the boosting limit point is reached, a brake having a wheel brake cylinder connected through a fluid passage to a master cylinder serving as a first hydraulic pressure source, for braking a wheel, and a pressure increasing device having a second hydraulic pressure source connected to the fluid passage, and wherein the pressure increasing device initiating a pressure increasing operation, when the brake operating force has increased to the transition point, to increase the wheel cylinder pressure to be higher than the master cylinder pressure, by using the second hydraulic pressure source.

Abstract: A braking device, particularly for a motor vehicle, comprising a master cylinder (10) associated with a pneumatic booster (12), and a vacuum pump (36) to create a vacuum in the vacuum chamber (16) of the booster, characterized in that the vacuum pump (36) is fixed to the envelope (14) of the booster on the inside of the latter within the vacuum chamber (16).

Abstract: A servobrake (10), of the type comprising a pneumatic brake booster (12) and a master cylinder (22) a main piston (20) of which slides in a front pressure chamber (24) and comprises:

Abstract: Described is a braking-pressure control system, especially for a road vehicle, having a pneumatic brake booster (14), having a main cylinder (16) in which a main-cylinder pressure (PHZ) can be generated by a pneumatic brake booster (14), and having a hydraulic modulator (17) which is connected between the main cylinder (16) and at least one wheel-brake cylinder (10-13) of at least one wheel; the hydraulic modulator (17) including a configuration of switchable valves (ASV, USV, EV, AV), as well as one pump (25, 25′); and a wheel-brake cylinder pressure (PRZ) being able to be generated in the at least one wheel-brake cylinder (10-13), using the hydraulic modulator; the wheel-brake cylinder pressure being higher than the main-cylinder. pressure (PHZ). The braking-pressure control system is characterized in that the pneumatic brake booster (14) is designed in a manner allowing it to already reach its saturation point (A0, A1) at a main-cylinder pressure (PHZ) of less than 50 bar.

Abstract: A vehicle motion control device includes a throttle opening amount automatic adjusting device for adjusting automatically the opening amount of the engine throttle valve irrespective of accelerator pedal operation, a control device for performing an automatic pressure increase control to the wheel cylinder at least during a non-operating condition of the brake pedal and for controlling the throttle opening amount automatic adjusting device, an intake vacuum pressure decrease condition detecting device for detecting a decrease condition of the intake vacuum pressure, and a counter for counting the number of times the automatic pressure increase control is performed under the intake vacuum pressure decrease condition. The control device corrects the throttle opening amount at the automatic pressure increase control to decrease based on the number of time the automatic pressure increase control is performed.