摘要:
A braking system including a brake cylinder (52, 54, 66, 68, 282, 292, 286, 296), a first hydraulic pressure source (70, 348, 430) having a first pump device (74, 352, 432) for pressurizing a working fluid, a second hydraulic pressure source (72, 450, 498, 520, 548) operable in response to an operation of a brake operating member (96), to pressurize the fluid to a pressure higher than a value corresponding to an operating force of the brake operating member, and a brake-cylinder-pressure control device (56-62, 240) operable when the brake cylinder is disconnected from the second hydraulic pressure source, to control the pressure of the fluid pressurized by the first hydraulic pressure source, such that the fluid pressure in the brake cylinder is controlled to a value determined on the basis of the operating force, and wherein an emergency communication device (152, 162) is operated when at least one of the brake-cylinder-pressure control device and the first pump device fails to normally function, to hold the brake cylinder in communication with the second hydraulic pressure source.
摘要:
Es wird ein elektrohydraulisches Bremssystem sowie Verfahren und Vorrichtung zur Steuerung des selben beschrieben, bei dem eine Hydraulikflüssigkeit aus einem Druckspeicher (44) über Ventilmittel (MV_UVR,MV_UVL,MV_UHR,MV_UHL) in jeweilige Radbremszylinder (16,18,20,22) einsteuerbar ist, wobei die Hydraulikflüssigkeit mit einer Pumpe (42) in den Druckspeicher (44) förderbar ist, wobei Mittel (100-105) zur Erfassung der Temperatur des elektrohydraulischen Bremssystems, insbesondere der Temperatur der Hydraulikflüssigkeit, und Mittel (200) zur Berücksichtigung der erfaßten Temperatur bei der Steuerung bzw. Regelung des elektrohydraulischen Bremssystems vorgesehen sind.
摘要:
The invention relates to a hydraulic assembly comprising a housing (9) and at least one cover (2) which closes off the housing (9). To allow the hydraulic assembly to be fixed to a stationary component (1), the cover (2) is provided with a securing device (3).
摘要:
A brake fluid pressure control device for use in an automotive brake system including a master cylinder (1), a wheel brake (10), and a main fluid line (2) connecting the master cylinder (1) to the wheel brake (10). This device includes a power pump (3) provided in a fluid supply line for discharging fluid into the main fluid line (2). An on-off valve (4) is provided in the main fluid line (2) upstream of the point at which the outlet circuit of the pump (3) merges with the main fluid line (2). A fluid reservoir (5) is provided in the fluid supply line upstream of the pump (3). The reservoir (5) includes a housing and a piston (6) slidably mounted in the housing to partition the interior of the housing into a first chamber (8) and a second chamber (9) and biased by a spring (7) toward the first chamber (8). The spring (7) keeps the fluid pressure in the first chamber (8) above the atmospheric pressure. For automatic braking, a changeover valve (11) is changed over to supply fluid in the first chamber (8) into the inlet port of the pump (3). When the automatic braking is off, the inlet and outlet ports of the pump (3) are connected to the second and first chambers (8,9) of the reservoir (5), respectively, to supply fluid into the first chamber (8).
摘要:
The proposal is for an electronically controllable brake actuation system for motor vehicles with a master cylinder (2) operable by a pedal (1) with braking force transmitters (4, 5) controllable via an electronic control unit (3) to which the wheel brakes (7, 8) of the vehicle are directly connected and can be connected to the master cylinder (2) via hydraulic lines (11, 12) which can be blocked by valves devices (16, 17), with at least one sensor device (13, 22, 23) to recognise the deceleration instruction and at least one simulator chamber (14, 15) co-operating with the master cylinder. In order to improve the operation of such a system, especially the dynamics of the brake pressure transmitter, while reducing the response time of the entire system, the invention proposes that the valve systems taken the form of electromagnetic valves (16, 17) controllable with a delay by the electronic control unit (3). Low-pressure stores (51, 52) are connected to the pressure chambers of the brake pressure transmitters (4, 5) and connected to the wheel brakes (7, 8) in the released position of the brake pressure transmitters (4, 5).
摘要:
An accumulator (28) for an anti-lock brake system includes a valve body portion (31) defining an accumulator chamber (30), an accumulator piston (38) slidably disposed within the accumulator chamber (30), a spring (58), and a cover (42). The accumulator chamber (30) has a fluid inlet (32) for connection to a source of pressurized fluid at a first end of the chamber (30). The chamber (30) has a second end (36) open to atmosphere. The accumulator piston (38) separates the first end (32) of the chamber (30) from the second end (36) of the chamber (30). The spring (58) is disposed in the accumulator chamber (30) between the piston (38) and the second end (36) of the chamber (30) and biases the piston (38) toward a first position. The cover (42) closes the connection between the second end (36) of the chamber (30) and atmosphere and has micro-porous structure. The micro-porous structure is configured to block water molecules and to pass constituent molecules of air, thereby enabling air to be communicated across while preventing the intrusion of water into the chamber through the second end (36).
摘要:
A brake pressure control system is proposed which works on the fluid-return principle. This system contains a low pressure accumulator (9) which must be emptied at the end of a braking action with brake pressure control. For this purpose the pump (12) is controlled for a certain time. In this emptying phase, the motor (13) is controlled by pulse-width modulation. During the phases of the control signal during which no voltage is applied to the motor (13), a measurement of the electromotive counterforce is performed. This counterforce is a measure of the speed of the motor (13) or the speed of the connected pump (12). If the speed or the change is speed exceeds a given value, then this can be accepted as an indication that the low pressure accumulator is empty. As soon as such a signal appears, the emptying phase is ended by switching off the motor (13). In this way the emptying phase is kept as short as possible.
摘要:
Described is a brake system which is protected against blocking by virtue of the fact that, during a control operation, the brake line is closed off by a separating valve (4). The wheel brakes are connected to the induction side of a pump (7) via a return line (5). Located in the return line (5) is an escape valve (6). The output side of the pump is connected, via a pressure line (8), to a point on the brake line (2, 3) between the separating valve (4) and the brake. Located in the pressure line is a choke (9). Non-return valves (14) between the master cylinder (1) and the output side of the pump (7) make it possible, when hydraulic-fluid demand in the control loop is high, to supply fluid from the master cylinder (1) to the control loop.
摘要:
Dans des systèmes hydrauliques de freinage à dispositif anti-blocage automatique, une soupape (3) à plusieurs voies laisse passer, dans sa position de base, le milieu sous pression, reliant le générateur (1) de pression de freinage au frein (2) de roue monté en aval, et commande, en fonction de la pression générée dans le conduit de pression auxiliaire (4), la liaison hydraulique entre le générateur (1) de pression de freinage et le frein (2) de roue qui lui est associé. On peut ainsi ajouter de manière économique un système d'antidérapage à l'accélération à un système de freinage, sans qu'il soit nécessaire de modifier fondamentalement les circuits de base de ce dernier, notamment les circuits électroniques de commande, ni d'accroître la partie électrotechnique du système de freinage.