Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1994-08-19
1996-03-26
Ballato, Josie
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303DIG2, B60T 848, B60T 824, B60T 712
Patent
active
055015140
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a hydraulic brake system as set forth here in after.
A vehicle hydraulic brake system with an anti-lock protection device and a control unit is known from the U.S. Pat. No. 4,809,183. In addition, a hydraulic pressure source and at least one analysis circuit is associated with the anti-lock protection device for recognizing oversteer tendency, understeer tendency and incipient danger of skidding and for generating control signals for the anti-lock protection device so that the latter automatically brakes the vehicle, using the hydraulic pressure source, whereby, from case to case, the wheels of one vehicle axle or all the vehicle axles are braked. The automatic braking stabilizes the vehicle and therefore acts against an oversteer tendency or understeer tendency or a danger of skidding or skidding which has already appeared. The pressure source is not represented. Skew running angles, for example, are measured to obtain the control signals and are compared with preselected threshold values. The rotational velocity of the vehicle about the vertical axis can also be observed, for example, by means of a gyroscope. Alternatively, transverse accelerations can also be measured by means of acceleration sensors associated with the axles and can be analysed.
From the publication WO 90/02064, it is known to use an anti-lock protection device with 3/3-way valves for anti-lock protection operation and, in the case of vehicle stabilization becoming necessary for the purpose of compensating for skidding or the danger of skidding, to separate the front wheel brakes from a main pressure cylinder and to automatically brake the front wheels strongly, in particular to lock them, using a pressure source and the 3/3-way valves associated with the front wheels. The publication provides three solution possibilities for obtaining control signals for the stabilization case in order to control the 3/3-way valves in brake pressure build-up positions, so that stronger braking pressure or even locking pressure is supplied to the front wheel brakes The pressure source is not represented. Means which prevent an undesired draining of pressure medium to the main brake cylinder in stabilization operation are likewise not represented.
The publication DE 41 09 925 A1 reveals a hydraulic brake system with advantageous closed brake circuits and with an anti-lock protection device operating on the so-called feed-back principle and, for controlling the driving behaviour of a vehicle in a bend, a combination installed per brake circuit, between the said anti-lock protection device and a main brake cylinder, of a controllable 2/2-way valve and a cylinder with a separating piston and a separating piston return spring and, for both brake circuits, a common auxiliary pump and a 3/2-way valve downstream of the latter for controlled action on the separating piston and for controlling the 2/2-way valves, which are hydraulically controllable by control inputs for closing brake conduits between the cylinders and the main brake cylinder. After the main brake conduits have been shut off, pressures generated in the cylinders are modulated by means of the anti-lock protection device and are individually supplied to the wheel brakes of the four wheels. The anti-lock protection device can also reduce the pressures supplied to the wheel brakes individually. A control unit which controls both the 3/2-way valve and the anti-lock protection device in order to improve the driving behaviour in a bend of the motor vehicle equipped with it, can also switch on a drive motor for the auxiliary pump. A disadvantage is that, because of the hydraulic circuitry between the cylinders and the modulation valve arrangements of the anti-lock protection device, the auxiliary pump has to supply a pressure up to the level of the maximum braking pressure to be expected when driving around a bend. The auxiliary pump has to be correspondingly powerfully configured and the necessary drive motor is heavy and loads an electrical on-board network of the
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patent: 5015043 (1991-05-01), Resch
patent: 5205623 (1993-04-01), Holzmann et al.
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Altmann Rainer
Binder Ju/ rgen
Lauer, deceased Rainer
Lauer, heir Joscha
Meyer Michael-Raymond
Ballato Josie
Greigg Edwin E.
Greigg Ronald E.
Mercedes - Benz AG
Robert & Bosch GmbH
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