Device For Determining A Driving State and Method For The Driving-State-Dependent Operation Of A Combined Vehicle Brake System
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Abstract
A device for determining a driving state of a two-axle motor vehicle, which driving state is formed from the driving situation of the motor vehicle and the state of the underlying surface, wherein output signals from vehicle on-board sensors are evaluated in order to determine the driving situation and wherein a routine for determining and/or estimating the friction value of the underlying surface is provided in order to determine the state of the underlying surface. Also disclosed is a method for operating a combined vehicle brake system, in particular for motor vehicles, having hydraulically actuable wheel brakes at a front axle and having electromechanically actuable wheel brakes at a rear axle, wherein the vehicle wheels assigned to the rear axle can be driven at least at times by an electric motor which can be operated as a generator for the recuperation of braking energy
24 Citations
21 Claims
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1-10. -10. (canceled)
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11. A device for detecting a driving state of a two-axle motor vehicle,
wherein the driving state is formed from a driving situation of the motor vehicle and a state of the underlying road surface, wherein output signals from vehicle on-board sensors are evaluated in order to determine the driving situation, wherein a routine for detecting, estimating or both detecting and estimating a coefficient of friction (μ - ) of the underlying road surface is provided in order to determine the state of the underlying road surface, and
wherein the device for detecting a driving state outputs a numerical value which is a measure of a distribution of a braking force between a front axle and a rear axle of the motor vehicle. - View Dependent Claims (12, 13, 14, 15, 16, 17)
- ) of the underlying road surface is provided in order to determine the state of the underlying road surface, and
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18. A method for operating a combined vehicle brake system of a motor vehicle having hydraulically activated wheel brakes on a front axle and having electromechanically activated wheel brakes on a rear axle,
wherein vehicle wheels which are assigned to the rear axle are driven at least temporarily by an electric motor which can be operated as a generator in order to recover braking energy, and wherein the generator mode brings about a braking force at the vehicle wheels which are assigned to the rear axle, wherein a pedal travel sensor detects a driver'"'"'s braking request and feeds it to an open-loop and closed-loop control unit which distributes the braking force for the hydraulically activated wheel brakes, the electromechanically activated wheel brakes and the electric motor which can be operated in the generator mode, and wherein the driving state of the motor vehicle is detected and a numerical value which is a measure of a distribution of the braking force between the front axle and the rear axle of the motor vehicle is determined.
Specification