Method and braking system for regulating the driving stability of a motor vehicle
First Claim
1. A method for controlling driving stability of an automotive vehicle, comprising the steps of:
- determining a steering angle, a rotational behavior of individual wheels, a vehicle yaw velocity, a vehicle forward speed, and a coefficient of friction between tires and road;
determining an intervention threshold based on differences in the rotational behavior of individual wheels, adjusting brake pressure by use of a hydraulic pump having a clocked actuation to vary the vehicle yaw velocity toward the intervention threshold by one of increasing or decreasing brake pressure, whereby a clock frequency for driving the hydraulic pump is increased when the intervention threshold is exceeded.
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Accused Products
Abstract
The present invention relates to a method of improving the control , behavior of an electronically regulated and/or controlled driving stability control system, wherein input quantities for the control are derived from the rotational behavior of the wheels and wherein in situations which are critical for driving stability, the driving stability is increased by braking pressure introduction and/or braking pressure modulation. In order to obviate the need for a precharging pump, the present invention proposes that criteria for evaluation of the driving situation and for the early detection of a driving situation inhering an increased risk are derived from the rotational behavior of the wheels, and that the commencement of driving stability control is prepared upon detection of a driving situation inhering an increased risk. A brake system for implementing the method is also an object of the present invention.
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Citations
12 Claims
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1. A method for controlling driving stability of an automotive vehicle, comprising the steps of:
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determining a steering angle, a rotational behavior of individual wheels, a vehicle yaw velocity, a vehicle forward speed, and a coefficient of friction between tires and road;
determining an intervention threshold based on differences in the rotational behavior of individual wheels, adjusting brake pressure by use of a hydraulic pump having a clocked actuation to vary the vehicle yaw velocity toward the intervention threshold by one of increasing or decreasing brake pressure, whereby a clock frequency for driving the hydraulic pump is increased when the intervention threshold is exceeded. - View Dependent Claims (2, 3, 4)
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5. A method for controlling driving stability of an automotive vehicle, comprising the steps of:
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determining a steering angle, a rotational behavior of individual wheels, a vehicle yaw velocity, a vehicle forward speed, and a coefficient of friction between tires and road;
determining an intervention threshold based on differences in the rotational behavior of individual wheels;
issuing a signal to commence driving stability control when the intervention threshold is exceeded; and
adjusting brake pressure by use of a hydraulic pump having a clocked actuation to vary the vehicle yaw velocity toward the intervention threshold by one of increasing or decreasing brake pressure, whereby a clock frequency for driving the hydraulic pump is increased when the intervention threshold is exceeded. - View Dependent Claims (6, 7, 8)
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9. A brake system for controlling driving stability of an automotive vehicle, comprising:
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a controller comprising a steering angle generator for measuring a steering angle, a first measuring data emitter for measuring a yaw velocity, a second measuring data emitter for measuring wheel rotational speeds, an evaluating circuit for receiving signals of the steering angle, the yaw velocity and the wheel rotational speeds, the controller determining an intervention threshold based on the wheel rotational speeds, and a comparator for comparing the yaw velocity with the intervention threshold, and a hydraulic pump having a clocked actuation for adjusting brake pressure, a clock frequency for driving the hydraulic pump being increased when the intervention threshold is exceeded, wherein brake pressure is adjusted to vary the yaw velocity toward the intervention threshold by one of increasing or decreasing brake pressure. - View Dependent Claims (10, 11, 12)
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Specification