Method for defining at least one characteristic curve of a pressure-medium-actuated brake system of a vehicle

A characteristic curve, comprising:

• a curve which, in a pressure-fluid-actuated brake system, represents a relationship between a brake pressure and a brake demand;
• wherein the curve has been defined or determined by performing the following:
• a) specifying a brake demand value range for the brake demand, which includes a minimum brake demand, a maximum brake demand, and intermediate values between the minimum brake demand and the maximum brake demand,
• b) specifying a brake pressure value range for the brake pressure, which includes a minimum brake pressure, a maximum brake pressure and intermediate values between the minimum brake pressure and the maximum brake pressure,
• b1) defining a support point of the characteristic curve, at which a brake demand limit value and a specific brake pressure are associated with each other, wherein the brake demand limit value lies within the brake demand value range and is greater in amount than the amount of the minimum brake demand but less than the amount of the maximum brake demand, and wherein the specific brake pressure lies within the brake pressure value range and is equal to the maximum brake pressure,
• b2) defining another support point that assigns the maximum brake pressure and the maximum brake demand to each other,
• b3) defining a characteristic curve section of the characteristic curve, which extends between the support point and the another support point, and which automatically assigns the maximum brake pressure to each brake request in a brake demand range.

A method for operating a pressure-medium-actuated brake system of a vehicle, in which at least one brake cylinder can be acted upon by a pressure medium which is under a brake pressure, and in which the brake pressure is determined on the basis of at least one characteristic curve which represents a relationship between the brake pressure and a brake demand, the method comprising:

• checking whether the brake demand lies in the third brake demand range, and if so, determining the brake pressure based on the third characteristic curve section, and then the at least one brake cylinder is acted upon with the maximum brake pressure, and if not, determining the brake pressure based on the third characteristic curve section;
• wherein the at least one characteristic curve has been defined or determined by performing the following:
• a) specifying a brake demand value range for the brake demand, which includes a minimum brake demand, a maximum brake demand, and intermediate values between the minimum brake demand and the maximum brake demand,
• b) specifying a brake pressure value range for the brake pressure, which includes a minimum brake pressure, a maximum brake pressure and intermediate values between the minimum brake pressure and the maximum brake pressure,
• b1) defining a support point of the characteristic curve, at which a brake demand limit value and a specific brake pressure are associated with each other, wherein the brake demand limit value lies within the brake demand value range and is greater in amount than the amount of the minimum brake demand but less than the amount of the maximum brake demand, and wherein the specific brake pressure lies within the brake pressure value range and is equal to the maximum brake pressure,
• b2) defining another support point that assigns the maximum brake pressure and the maximum brake demand to each other,
• b3) defining a characteristic curve section of the characteristic curve, which extends between the support point and the another support point, and which automatically assigns the maximum brake pressure to each brake request in a brake demand range.

A pressure medium-actuated brake system of a vehicle, comprising:

• at least one brake cylinder can be acted upon by a pressure medium which is under a brake pressure;
• wherein the pressure-medium-actuated brake system, in which the at least one brake cylinder can be acted upon by the pressure medium which is under the brake pressure, and in which the brake pressure is determined based on least one characteristic curve which represents a relationship between the brake pressure and a brake demand, is controlled by performing the following:
• checking whether the brake demand lies in the third brake demand range, and if so, determining the brake pressure based on the third characteristic curve section, and then the at least one brake cylinder is acted upon with the maximum brake pressure, and if not, determining the brake pressure based on the third characteristic curve section;
• wherein the at least one characteristic curve has been defined or determined by performing the following:
• a) specifying a brake demand value range for the brake demand, which includes a minimum brake demand, a maximum brake demand, and intermediate values between the minimum brake demand and the maximum brake demand,
• b) specifying a brake pressure value range for the brake pressure, which includes a minimum brake pressure, a maximum brake pressure and intermediate values between the minimum brake pressure and the maximum brake pressure,
• b1) defining a support point of the characteristic curve, at which a brake demand limit value and a specific brake pressure are associated with each other, wherein the brake demand limit value lies within the brake demand value range and is greater in amount than the amount of the minimum brake demand but less than the amount of the maximum brake demand, and wherein the specific brake pressure lies within the brake pressure value range and is equal to the maximum brake pressure,
• b2) defining another support point that assigns the maximum brake pressure and the maximum brake demand to each other,
• b3) defining a characteristic curve section of the characteristic curve, which extends between the support point and the another support point, and which automatically assigns the maximum brake pressure to each brake request in a brake demand range.