Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified electrical sensor or system
Reexamination Certificate
1999-01-16
2001-01-23
Dombroske, George (Department: 2855)
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specified electrical sensor or system
C073S781000, C073S796000, C073S862041
Reexamination Certificate
active
06176139
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a pressure force sensor, in particular for the detection and control of wheel braking forces in connection with electro-mechanical brake systems for motor vehicles.
In connection with a brake device for motor vehicles known from EP 0 566 133 B1, the required braking force is transferred to the wheels by means of a hydraulic servo unit. The cylinder pressure generated by pushing the brake pedal down is measured in a main cylinder, and this measured value is employed as a control signal for a hydraulic control device for optimizing the braking effect.
It is necessary, in particular in connection with electro-mechanical braking systems, to detect suitable control values for optimizing the braking effect individually at each wheel, which can then be supplied to an electronic control device. With brake systems controlling the wheel brake force or respectively the wheel brake torque, it is useful to detect these wheel brake forces or respectively torque directly at the wheel, if possible.
SUMMARY OF THE INVENTION
The pressure sensor in accordance with the present invention has a fork arm attached to each connector and having two forked ends which are offset by 90° and enclose the force sensor module, and pressure elements are located between the bases of the fork arms and the force introduction surface of the force sensor module, which are laterally also enclosed by angled sections of the fork ends so that pressure forces as well as tensile forces can be passed from the connectors to the force introduction surface of the force sensor module.
The pressure sensor in accordance with the invention can be employed for the detection of all braking torques transmitted at the braked wheel and which makes a suitable signal available for further processing in a brake control device.
Magneto-elastic pressure sensors are used in an advantageous manner, which are customarily used for sensing pressure forces which, for example, also suffices for controlling forces in the brake calipers of the brake system. In accordance with the invention, the requirement for two pressure sensors for making a torque control for forward and reverse driving possible is avoided in a simple manner. The problem of force introduction and the zero drift point in connection with overloads under changing load conditions, such as can occur in connection with single sensor concepts during forward and reverse travel, has been solved in accordance with the invention.
A conversion of tensile and pressure forces, while keeping the pressure force introduction, is therefore possible in a particularly advantageous manner with the pressure sensor in accordance with the invention, because of which a use of the pressure force/pressure sensor for detecting changing tensile and pressure forces can also be employed for general force sensing purposes.
A control of the wheel brake torque can be performed in a simple manner by detecting the support force in the mechanical brake device at a torque support which transmits tensile and pressure forces, wherein the wheel brake is hingedly seated and is supported by this torque support. A control of the braking torque in electronically controlled brake systems with alternating load directions is possible with only one pressure force sensor for both directions by using the output signal of the pressure sensor.
Embodiments which are also advantageous are recited in the further dependent claims.
REFERENCES:
patent: 2920880 (1960-01-01), Laycock
patent: 3036283 (1962-05-01), Singdale et al.
patent: 3110175 (1963-11-01), Seed
patent: 3399564 (1968-09-01), Freightliner
patent: 3572102 (1971-03-01), Baratta
patent: 4088907 (1978-05-01), Jones et al.
patent: 4472976 (1984-09-01), Bonfils
patent: 5279394 (1994-01-01), Lucas
patent: 5410911 (1995-05-01), Sab Wabco
patent: 5490427 (1996-02-01), Yee et al.
patent: 0 566 133 B1 (1993-10-01), None
Blosch Georg
Seils Wolfgang
Dombroske George
Robert & Bosch GmbH
Striker Michael J.
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