Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1995-05-04
1997-08-12
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 14, 303 15, 3031192, 3031134, B60T 1366, B60T 832
Patent
active
056558201
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to systems for regulating pressure in motor vehicle hydraulic braking circuits. In these circuits, just as in most hydraulic installations, it is necessary to cause the hydraulic pressure to vary in a pressure receiver, in response to a control signal. The pressure receiver may be made up for example, of a hydraulic thrust cylinder or a hydraulic motor, and the control signal may, for example, be mechanical, hydraulic, or electrical.
Document GB-A-2,215,416, for example, corresponding to the preamble of the main claim, discloses a system of this sort in which the pressure receiver is a brake motor and where the control signal is electrical. The system described in this document, however, exhibits numerous drawbacks, such as a very significant electrical power consumption, for example. Above all, it exhibits the major drawback that the slightest failure in the electrical circuit deprives the vehicle equipped with this system of any braking. Such a failure is all the more likely to occur the greater the electrical power consumption.
On the other hand, numerous braking systems are known in which the control signal is mechanical, generally made up of a master cylinder controlled by a brake pedal and possibly associated with a boost servo, which systems may comprise electrically controlled solenoid valves providing an antilock function on the wheels under braking or a function of preventing wheelspin under acceleration. These systems do not, however, allow a purely electrical control of the braking pressure. Such a control is desirable, however, if it is desired for the system also to fulfil a function of automatic braking, for example in conjunction with anticollision radar.
The object of the present invention is consequently to propose a system for regulating pressure in a hydraulic braking circuit, which can switch over from a purely electrical or automatic control mode to a mechanical or manual control mode, and in which a failure of the automatic control circuit still allows operation under the effect of a mechanical or manual control.
The present invention therefore relates to a system for regulating pressure in a hydraulic circuit comprising at least one generator of fluid under pressure, at least one reservoir of fluid under low pressure and at least one pressure receiver, the system comprising at least one solenoid valve including an electrical winding and a moving magnetic core controlling the position of a distributor slide valve sliding in a bore, the bore communicating with a first duct connected to the generator of fluid under pressure, a second duct connected to the pressure receiver and a third duct connected to the reservoir of fluid under low pressure, the system operating in response to a first type of control signal.
According to the invention, the system for regulating pressure includes means for interrupting the feeding of the system by the generator of fluid under pressure and allowing it to be fed by a second generator of fluid under pressure operating in response to a second type of control signal if at least one condition allowing operation in response to the first type of control is not fulfilled.
The invention will be better understood and other objects, characteristics and advantages will emerge from the description of one embodiment which will be given with reference to the appended drawing in which: of a system for regulating pressure in accordance with the present invention.
The FIGURE represents a system for regulating pressure, including a regulation module denoted overall by the reference 100, located in a hydraulic circuit between a source 110 of fluid under high pressure equipped with a pressure relief valve or safety valve 115, a reservoir 120 of fluid under low pressure, and at least one pressure receiver 130, 130a, 130b.
The regulating module 100 is formed within a body 10, and each pressure receiver 130, 130a, 130b is connected by a duct 12, 12a, 12b to a bore 14, 14a, 14b formed within the body 10. In each bore 14, 14a, 14b there can slide
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AlliedSignal Europe Services Techniques
Butler Douglas C.
McCormick Jr. Leo H.
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