Setpoint generator for control of an electrically controlled bra

Details Setpoint generator for control of an electrically controlled bra Setpoint generator for control of an electrically controlled bra

1998-01-12

2000-08-08

Graham, Matthew C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303155, 303191, 303 20, B60T 1514

Patent

active

060990864

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a setpoint generator, in particular for a brake pedal in an automotive vehicle for the control of an electrically controlled brake system, with at least two parallely connected sensors working in accordance with different principles, with subsequently connected electronic input circuits.
Such a setpoint generator, in particular for a brake pedal in an automotive vehicle, is known from published German patent application 35 04 096. It is for the control of an electric brake system and contains a parallel connection of a travel sensor and a force sensor, the force sensor supplying the reference variable. To the sensors, there are subsequently connected electronic main circuits which verify the sensor signals according to diverse criteria with respect to plausibility, and which, in case of an error, trigger a warning light. In order to provide a maximum extent of safety and accuracy, the sensors of the known setpoint generator proceed on different principles, and only in case of a stated malfunction of the force sensor, the reference variable is supplied by the travel sensor.
It is to be regarded as a disadvantage of the known setpoint generator that, in particular for exceptionally small signals, the random noise is in the order of magnitude of the signals and thereby distorts them. Hence, there is provided a filtration of the signals which, however, results in a bad temporal behavior, i.e. a slow reaction. This conveys an inert vehicle behavior to the driver which is undesirable. If, however, no filtration is carried out, an uneven braking behavior will occur, which, as well, is felt to be disturbing.
An object of the invention therefore is to prevent the disadvantages of the known setpoint generator and thus to enhance the comfort.


SUMMARY OF THE INVENTION

This object is achieved in that, for the generation of an electric setpoint, the output signals of the sensors are weighted in the electronic input circuits, and respective partial setpoints are summed up. Preferably, the output signals of the sensors are weighted in a way that, in the ranges where a bad signal
oise ratio is found, the corresponding sensor signal has a lesser share than the one that is not disturbed as heavily, so that in total a largely smooth setpoint ensues. Thus, over the entire range of operation, a lesser random noise is attained.
It is provided that the weighting occurs in dependence of the output signal of at least one of the sensors. Here, the weighting may be dependent on the sensor signal itself. The weighting factor thus for instance is small when the signal itself is small and thus shows a bad signal
oise ratio. Provided that there is a characteristic range in which a known disturbance of the sensor signal appears, an accordingly small weighting factor can be provided in this range. Further on, it is provided to make the weighting factor also dependent on the signal of the other sensor, for example if the signal of the one sensor is supposed to get a low weighting while the weighting factor of the other sensor signal is supposed to be large, or vice versa.
According to the invention, it is further on provided that the weighting occurs also in dependence of other sensor signals available in automotive vehicles. These can be signals of a temperature sensor, a humidity sensor or another suitable sensor. The weighting of the sensor signals hence can also be adapted to a temperature dependent or humidity-dependently varying characteristic.
The weighting, accordingly, can correspond to a simple analytical function. Preferably, however, at least one special weighting function is used which, for instance, may be stored in the electronic input circuitry. This weighting function can be derived individually for each vehicle type and optimally adapted to this vehicle type and the desired brake characteristic by way of experiments or as a result of simulating calculations or other suitable methods. The weighting function derived this way may then be stored in a vehicle-sp

REFERENCES:
patent: 5230549 (1993-07-01), Osada
patent: 5261730 (1993-11-01), Steiner et al.
patent: 5332296 (1994-07-01), Morita et al.
patent: 5558409 (1996-09-01), Walenty et al.
patent: 5564797 (1996-10-01), Steiner et al.
patent: 5567021 (1996-10-01), Gaillard
patent: 5586814 (1996-12-01), Steiner

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