Fluid-pressure and analogous brake systems – Pipeless valves
Patent
1983-11-15
1986-08-19
Stoner, Jr., Bruce H.
Fluid-pressure and analogous brake systems
Pipeless valves
303100, 303DIG4, 303 97, 303109, B60T 800, B60T 1722
Patent
active
046065865
DESCRIPTION:
BRIEF SUMMARY
The invention is based on a brake force regulating system as generally defined by the preamble to the main claim.
In motor vehicle brake systems actuated by external or auxiliary force, the use of brake regulators which actuate the brake in accordance with specific driving situation variables of the motor vehicle is known.
For instance, it is known to provide load transducers on the axles of the motor vehicle and then with the transducer signals to perform a load-dependent regulation of brake force. A system of this kind is described in German laid-open application DE-OS No. 20 57 973, for instance.
It is furthermore known to provide so-called anti-skid braking systems (ABS), which if the wheels of the motor vehicle lock on a slippery road surface direct a braking pressure to the wheels at which the wheels are kept just below the locking threshold. An anti-skid braking system of such a kind is described, for example, in German examined application DE-AS No. 16 55 432.
Finally, regulating systems for so-called startup slippage have become known, in which the wheels of a motor vehicle are prevented from spinning, when starting up with excessive engine torque, by providing that the wheel brakes of the spinning wheels are triggered selectively. A regulating system of this kind is described in German Patent DE-PS No. 18 06 671, for example.
The feature common to these known systems is that the brake force is in principle regulated without regard to the driver's wishes. The regulation in these cases is instead effected exclusively in accordance with prespecified vehicle data (load-dependent regulation) or with the attainment of specific driving situations (anti-skid braking system, startup slippage regulation), so that the wish of the individual driver is not taken into consideration.
In conventional braking, the driver specifies a specific desired deceleration of the motor vehicle. This wish of the driver is converted in a controlled manner to a brake force, and the effect of the brake force in the form of an actual deceleration is fed back via a feedback loop of which the driver is also a part. From the actual effect of the brake force which he has prespecified, the driver ascertains whether the established brake force is sufficient or should be increased or decreased. This inclusion of the driver in the regulating loop represents a further burden on the driver, however, in addition to the one of always having to evaluate the general driving situation of the motor vehicle.
ADVANTAGES OF THE INVENTION
The brake force regulating system according to the invention and having the characteristics of the main claim has the advantage over the prior art that the driving situation variable prespecified by the driver, that is, the deceleration of the vehicle or the adhesion force at one or more wheels is established in a closed regulating loop without including the driver. The driver is accordingly relieved and can thus devote his full attention to the actual driving situation.
As a result of the provisions disclosed in the dependent claims, advantageous further developments of and improvements to the brake force regulating system disclosed in the main claim are attainable.
In a preferred embodiment of the invention, the forces arising in the wheel suspensions are ascertained via transducers, and from these forces the vertical and horizontal forces engaging the wheels or axles are ascertained. In the case of decleration regulation, an axle-by-axle, load-dependent brake force regulation is attainable using these measured values; in all the systems according to the invention, the adhesion force at the wheels can be ascertained from these measured variables, and thereby either a regulation of adhesion force per se or generally a regulation to a prespecified difference in the adhesion force at the individual axles can be performed. Given a regulation of adhesion force per se, a further load-dependent brake force regulation can be dispensed with.
Finally, suitable testing means for the supply pressure of the axle-by-axle b
REFERENCES:
patent: 3131975 (1964-05-01), Smith et al.
patent: 3738709 (1973-06-01), Stokes
patent: 3980344 (1976-09-01), Burckhardt
patent: 4131325 (1978-12-01), Bayliss
patent: 4208074 (1980-06-01), Ishigami
patent: 4327414 (1982-04-01), Klein
Eckert Konrad
Maurer Franz
Muller Egbert
Stumpe Werner
Greigg Edwin E.
Oberley Alvin
Robert & Bosch GmbH
Stoner Jr. Bruce H.
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