Fluid-pressure and analogous brake systems – Pipeless valves
Patent
1992-03-27
1993-09-14
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Pipeless valves
188181A, 303 97, 303103, B60T 888, B60T 832, B60T 1722, B62L 300
Patent
active
052442578
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a brake system for a two-wheel motor vehicle. More particularly it relates to a two-channel anti-lock brake system for a two-wheel motor vehicle.
Two-channel anti-lock brake systems for two-wheel motor vehicles of the above mentioned general type are known in the art.
A motorcycle anti-lock brake system is known from the brochure of the company FAG Kugelfischer Georg Schafer KG aA with the title Antiblockierregelsystem fur Motorrader (Anti-lock brake system for motorcycles), Publication No. HB 43 605/2 DA.
In the known motorcycle anti-lock brake system, the recognition of faults causes the anti-lock brake system to be switched off immediately. During the course of a closed-loop control operation, this generally leads to the immediate locking of the wheels of the vehicle. In the case of a four-wheel vehicle, this does not signify a driving situation which is critical in terms of safety. In contrast to a passenger car, however, a two-wheel vehicle will in all probability fall over if the system is unexpectedly switched off.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a two-channel anti-lock brake system for a two-wheel motor vehicle, which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly state, in a two-channel, anti-lock brake system for both wheels of a two-wheel motor vehicle in which when both wheels are being braked simultaneously and a fault occurs in one channel, a limited anti-lock brake system function is retained in form a normal closed-loop control using the intact channel and pressure introduction at the brake of a defective channel until a certain vehicle deceleration is reached, and the anti-lock brake system is only switched off when the vehicle comes to rest or when the anti-lock brake system closed-loop control operation ends.
The present invention prevents the system from being switched off automatically and simultaneously ensures the legally specified minimum vehicle deceleration (0.3 g) at high coefficients of friction.
From German Offenlegungsschrift 2232 034, it is known to monitor the valves of an anti-lock brake system with respect to their response time. If the response time is found to be too long, a signal for switching off the anti-lock brake system is generated but this signal is blocked for a certain period when a certain wheel behaviour is present and only subsequently causes the system to be switched off.
In the invention, the attention of the driver is additionally drawn to the critical driving condition by flashing activation of the safety light.
With respect to the expression "two-channel anti-lock brake system", it should be made clear that it refers to an anti-lock brake system with two sensors and two pressure modulators. The question of whether more than two analysis channels are provided for reasons of redundancy is unimportant in this respect.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a view showing a table of possible faults classified for different situations; and
FIG. 2 is a view illustrating a system for achieving respective reactions to a sensor failure.
DESCRIPTION OF PREFERRED EMBODIMENTS
The table of FIG. 1 shows possible faults classified for different situations.
Column 1 states whether the brakes are applied and where in each case. Different times when the failure of individual components (Columns 3 to 11) appears are listed in Column 2, the individual expressions having the following significance without bra
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Muller Elmar
Muller Werner
Butler Douglas C.
Robert & Bosch GmbH
Striker Michael J.
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