Patent ID: 9421961
Filing Date: 2016-08-23
CPC Classification: B60T

Claim Text:
1. A method for determining a brake pressure value of a brake pressure which is modulated by a pneumatic channel of a braking value encoder further having at least one electrical channel, in a braking device of a motor vehicle without using a brake pressure sensor, in which electrical signals which represent brake pressure values which are desired as a function of activations of the braking value encoder are generated by at least one electrical sensor which is assigned to the electrical channel, the method comprising: storing, via a control unit, a first characteristic curve, in which the electrical signals, modulated by the at least one electrical sensor of the electrical channel, depend on the degree of activation of the braking value encoder; storing, via the control unit, a second characteristic curve, in which the brake pressure values, modulated by the at least one pneumatic channel, depend on electrical signals detected by the electrical sensor; and determining, via the control unit, the brake pressure value which corresponds to a specific braking request as a result of activation of the braking value encoder based on the first characteristic curve and the second characteristic curve; wherein the braking value encoder includes the at least one electrical sensor which is assigned to the electrical channel, wherein the electrical signals generated by the electrical channel are fed to the control unit via a signal line, and corresponding control signals are applied to an electro-pneumatic control valve device to generate a specific brake pressure in brake actuators or brake cylinders of the braking device, and wherein the second characteristic curve is also determined as a function of a respectively present supply pressure from which the brake pressure in the pneumatic channel of the braking value encoder is derived.