Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1988-09-07
1990-08-21
Reger, Duane A.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
188181A, 303110, B60T 842
Patent
active
049500295
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a brake control system for vehicles with hydraulic brakes, for preventing wheel blocking and/or spinning.
Ever since the Maxaret antiblocking brake system was introduced for aircraft and purpose-built vehicles, a great deal of effort has been put into finding a system sufficiently inexpensive to be used in ordinary cars.
The ABS system by Bosch was the first to be used by the motor industry. Since then, further systems have been developed, for example ATE and ALB. The ATE system is the first to be used as factory-assembled equipment and has received lively publicity. Reviewers have been unanimous in nominating the factory-assembled antiblocking brake system the greatest contribution to traffic safety in the last decades.
From a general point of view, the shortcomings of current antiblocking systems therefore have no connection with the proper functioning, but are primarily of a technical and economic character. Current systems are technically highly sophisticated, but are far too expensive to justify installation in existing cars. As optional equipment, such systems cost about SEK. 10,000-25,000, depending upon the type of the system and the make of the car.
SUMMARY OF THE INVENTION
It therefore is the object of this invention to provide an antiblocking brake system which eliminates the above-mentioned shortcomings and still gives the same effect. The system can also be used for controlling wheel spinning.
Briefly, the system comprises a valve unit which is mounted at the brake yoke of a standard brake system and which, when there is a risk of wheel blocking or spinning, separates the brake system into a primary circuit and which a secondary or wheel circuit. A pressure control system is provided for separately controlling the brake pressure in the wheel circuit. The valve unit is activated by means of a sensor which is mounted at the wheel and directly or indirectly controls the function of the valve unit. The pressure in the secondary circuit is controlled by the pressure control system such that, when there is a risk of wheel blocking, the pressure in the secondary circuit is reduced, whereby the wheels are unblocked, and such that, when there is a risk of wheel spinning, the pressure in the secondary circuit is increased, whereby the spinning wheel is braked and the motive power is transmitted to the non-spinning driving wheel. If the valve unit is controlled by rotation indicators on the driving wheels, the valve unit is able, at different wheel speeds, to automatically control the motive power distribution between the wheels.
The system can be combined with power-reducing facilities, such as throttle, fuel and ignition controls, or combinations thereof.
The advantages of the system are that it comprises but few components, is readily mounted in all cars with hydraulic brakes and also is eminently suitable for subsequent installation. The system, does not affect the brake system of the car in the event of a breakdown. The low production cost yields a low-priced product. The system can be used for controlling two or more wheels, as one desires. With minor modifications, the system can also be used for controlling wheel spinning, separately or in combination with the antiblocking system. Because the system comprises but few components of small dimensions, and because alternative drives and control devices can be used, the system is applicable to most cars.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the invention will now be described with reference to the accompanying drawings in which
FIG. 1 illustrates schematically part of the brake system of a car, equipped with a brake control system according to the invention;
FIGS. 2A and 2B show the valve unit in the deactivated and the activated state, respectively;
FIG. 3 shows an alternative embodiment of the valve unit, equipped with a pressure control system and a mechanical sensor;
FIG. 4 shows a further alternative embodiment of the pressure control system, equipped with a
REFERENCES:
patent: 2868338 (1959-01-01), Lucien et al.
patent: 2963328 (1960-12-01), Lucien
patent: 3008548 (1961-11-01), Moyer
patent: 3294204 (1966-12-01), Zubaty
patent: 3386537 (1968-06-01), Watanabe
patent: 3574416 (1971-04-01), Skoyles
patent: 4436348 (1984-03-01), Farr
patent: 4726549 (1988-02-01), Dittner et al.
Albertsson Tor
Bjorshammar Thomas
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