A method that compensates for fluid pressure variations in a vehicle brake system so that the fluid pressure, brake torque and/or brake force at the wheel more accurately reflects that requested by the driver. In an exemplary embodiment, the method determines the braking intent of the driver, determ
A method that compensates for fluid pressure variations in a vehicle brake system so that the fluid pressure, brake torque and/or brake force at the wheel more accurately reflects that requested by the driver. In an exemplary embodiment, the method determines the braking intent of the driver, determines a current stage of the braking event (e.g., an apply stage, release stage, etc.), uses the braking event stage and the driver braking intent to select a pressure compensation, and uses the pressure compensation to generate compensated brake command signals for operating the vehicle brake system. This method is well suited for use with brake-by-wire systems, such as an electrohydraulic braking (EHB) system.
대표청구항▼
1. A method for operating a vehicle brake system, comprising the steps of: (a) determining a driver braking intent;(b) determining a pressure compensation that compensates for fluid pressure variations in a master cylinder of the vehicle brake system, wherein the pressure compensation is determined
1. A method for operating a vehicle brake system, comprising the steps of: (a) determining a driver braking intent;(b) determining a pressure compensation that compensates for fluid pressure variations in a master cylinder of the vehicle brake system, wherein the pressure compensation is determined with the use of empirically derived data accounting for imperfections in the operation of the master cylinder resulting in fluid pressure variations therein;(c) using the driver braking intent and the pressure compensation to generate compensated brake command signals that are compensated for fluid pressure variations in the master cylinder of the vehicle brake system; and(d) operating one or more aspects of the vehicle brake system according to the compensated brake command signals so that the effects of fluid pressure variations in the master cylinder of the vehicle brake system are mitigated. 2. The method of claim 1, wherein step (a) further comprises determining the driver braking intent by receiving a brake signal from a brake pedal sensor that senses the position, movement, exerted force, and/or state of a brake pedal. 3. The method of claim 1, wherein step (b) further comprises determining a braking event stage that is representative of a discrete stage, phase, segment and/or portion of a braking event, and using the braking event stage to determine the pressure compensation. 4. The method of claim 3, wherein the braking event stage is an apply stage, a steady-state stage, or a release stage. 5. The method of claim 3, wherein step (b) further comprises using the braking event stage to select a look-up table, and using the look-up table and the driver braking intent to determine the pressure compensation. 6. The method of claim 5, wherein the look-up table is a two-dimensional data structure that is specifically designed for a particular braking event stage and correlates the driver braking intent (input) with the pressure compensation that is needed in order to implement the driver braking intent (output). 7. The method of claim 5, wherein the look-up table is provided in terms of fluid pressure, brake torque, or brake force. 8. The method of claim 1, wherein step (d) further comprises operating one or more aspects of the vehicle brake system by sending the compensated brake command signals to a hydraulic unit, and using the hydraulic unit to control a fluid pressure within the vehicle brake system according to the compensated brake command signals. 9. The method of claim 1, wherein the vehicle brake system is an electrohydraulic braking (EHB) system. 10. A method for operating a vehicle brake system, comprising the steps of: (a) determining a driver braking intent;(b) determining a braking event stage that is representative of a discrete stage, phase, segment and/or portion of a braking event, and using the braking event stage to select a look-up table or other data structure from a plurality of such data structures each corresponding to a respective braking event stage, where the selected data structure is directed to that particular braking event stage and accounts for imperfections in the operation of the vehicle brake system resulting in fluid pressure variations therein during that particular braking event stage;(c) using the selected data structure and the driver braking intent to generate compensated brake command signals for the driver braking intent, wherein the compensated brake command signals are designed to compensate for fluid pressure variations that occur in a master cylinder of the vehicle brake system during that particular braking event stage and differ from fluid pressure variations that occur in other braking event stages; and(d) operating one or more aspects of the vehicle brake system according to the compensated brake command signals while the vehicle remains in the particular braking event stage. 11. The method of claim 10, wherein step (a) further comprises determining the driver braking intent by receiving a brake signal from a brake pedal sensor that senses the position, movement, exerted force, and/or state of a brake pedal. 12. The method of claim 10, wherein the braking event stage is an apply stage, a steady-state stage, or a release stage. 13. The method of claim 10, wherein the look-up table is a two-dimensional data structure that is specifically designed for a particular braking event stage and correlates the driver braking intent (input) with the pressure compensation that is needed in order to implement the driver braking intent (output). 14. The method of claim 10, wherein the look-up table is provided in terms of fluid pressure, brake torque, or brake force. 15. The method of claim 10, wherein step (d) further comprises operating one or more aspects of the vehicle brake system by sending the compensated brake command signals to a hydraulic unit, and using the hydraulic unit to control a fluid pressure within the vehicle brake system according to the compensated brake command signals. 16. The method of claim 10, wherein the vehicle brake system is an electrohydraulic braking (EHB) system.
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이 특허에 인용된 특허 (5)
Heubner Wilheim (Itzgrund DEX), Brake-pressure control system.
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