Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1998-09-14
2000-12-12
Mar, Michael
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 11, B60T 842
Patent
active
061588253
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method and a device for controlling a pump of an electrohydraulic braking system.
BACKGROUND OF THE INVENTION
In a conventional electrohydraulic braking system, the brake fluid is injected from a pressure accumulator into the individual wheel cylinders via valves. This pressure accumulator is charged via a pump. If the pump operates continuously, it causes considerable noise emission and disturbs driving comfort. Furthermore, resonance effects can occur under certain operating conditions.
German Patent No. 32 41 039 describes a braking force regulation system that has an anti-lock control system and a power brake unit. In this context, German Patent 32 41 039 describes a method for controlling a pump of an electrohydraulic braking system whereby the hydraulic fluid is injected with control from a pressure accumulator via valve means into the wheel cylinders, the hydraulic fluid being supplied by the pump into the pressure accumulator, and the pump being driven with a mark-to-space ratio that is predefinable according to demand. German Patent No. 32 41 039 also discusses that an advantage of this braking force regulation system is that the noise level is considerably reduced only during operation of the power brake unit. However, the generation of noise is unchanged when the anti-lock control system is activated.
SUMMARY OF THE INVENTION
An object of the present invention is to provide for a method and a device which will enable the noise load to be reduced still further during operation of the electrohydraulic braking system.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a block diagram of an electrohydraulic braking system according to the present invention.
FIG. 2 shows a first exemplary embodiment of the pump control of the electrohydraulic braking system according to the present invention.
FIG. 3a shows a driving signal for acting upon the output stage of the pump motor.
FIG. 3b shows another driving signal for acting upon the output stage of the pump motor.
FIG. 4 shows a further exemplary embodiment of the control according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The object of the present invention is to provide a method and a device based thereon which will enable the noise load to be reduced still further during operation of the electrohydraulic braking system. This is accomplished by the features characterized in the independent claims.
The essential elements of the electrohydraulic braking system are illustrated in FIG. 1. A brake pedal is indicated by 100. Via the brake pedal, pressure can be built up in a master brake cylinder 110. The movement of the brake pedal can be detected by a pedal travel sensor 118. The master brake cylinder is in contact with a reservoir 115. Master brake cylinder 110 is connected to a safety valve 120, which, when no flow is present, is in the position shown in FIG. 1. A pedal travel simulator 125 is switched parallel to the safety valve.
A pressure sensor 130 is disposed between master brake cylinder 110 and safety valve 120 and pedal travel simulator 125, respectively, in the connection line, supplying a signal that indicates the pressure PHZ in the master brake cylinder.
When no flow is present, safety valve 120 releases the connection between the master brake cylinder and the outlet valves 141 and 142. The outlet valves are also, in their condition when no flow is present, switched into admission position and release the connection to the brake cylinders.
Outlet valve 141 is allocated to brake cylinder VR of the right front wheel, and outlet valve 142 to brake cylinder VL of the left front wheel. The pressure in the brake cylinders can be detected by sensors 151 and 152.
Additionally, the brake cylinders are in contact with a pressure accumulator 185 via intake valves 161 and 162 and stop valve 170. The pressure prevailing in pressure accumulator 185 can be detected using pressure sensor 180. Intake valve 161 is assigned to the right front wheel, and intake valve 162 t
REFERENCES:
patent: 4824184 (1989-04-01), Spadafora et al.
patent: 5454632 (1995-10-01), Burgdorf et al.
patent: 5460436 (1995-10-01), Volz et al.
Hachtel Jurgen
Schunck Eberhardt
Mar Michael
Robert & Bosch GmbH
Siconolfi Robert A.
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