Method and device for check-testing a braking system
AssigneeRobert Bosch GmbH
InventorsGuenther Schmidt, Juergen Binder, Hermann Winner, Ulrich Gottwick
Life of this patent
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Abstract
A method and a device for check-testing a braking system in which, before travel commences, a self-test of the braking system is performed. During the course of the self-test, the valve arrangements allocated to the wheel brakes and the pressure supply providing the brake pressure are driven in a predefined manner. A plurality of test phases are provided, after whose respective conclusions, a pressure level to be expected should be reached. Otherwise a secondary braking operation is initiated at least for the subsequent operating cycle of the vehicle.
Claims18
A method for testing a braking system, the braking system including electrically operable valve arrangements, each of the electrically operable valve arrangements being allocated to a respective one of wheel brakes, the method comprising the steps of:
- electrically detecting a braking input generated by a driver;
- converting the braking input into at least one driving signal;
- controlling a pressure of a pressure supply in the braking system using the electrically operable valve arrangements, the pressure being controlled as a function of the at least one driving signal to generate wheel-brake pressure values;
- before a start of travel, performing a self-test of the braking system, the self-test including a plurality of test phases, wherein first predetermined actuations of the electrically operable valve arrangements and second predetermined actuations of the pressure supply are allocated to the test phases;
- during the self-test and for each of the respective wheel brakes, checking an operatability of a respective one of the electrically operable valve arrangements to detect a fault, wherein the operability is checked by comparing the wheel-brake pressure values with predetermined pressure values at an end of the test phases, the fault being detected if a pressure deviation is determined in at least one of the respective wheel brakes;
- and
- initiating a secondary braking operation if the fault is detected.
An apparatus for testing a braking system, the braking system including electrically operable valve arrangements, each of the electrically operable valve arrangements being allocated to a respective one of wheel brakes, the apparatus comprising:
- means for electrically detecting a braking input generated by a driver;
- means for converting the braking input into at least one driving signal;
- means for controlling a pressure of a pressure supply in the braking system using the electrically operable valve arrangements, the pressure being controlled as a function of the at least one driving signal to generate wheel-brake pressure values;
- means for performing a self-test of the braking system before a start of travel, the self-test including a plurality of test phases, wherein first predetermined actuations of the electrically operable valve arrangements and second predetermined actuations of the pressure supply are allocated to the test phases;
- means for checking an operability of a respective one of the electrically operable valve arrangements to detect a fault during the self-test and for each of the respective wheel brakes, wherein the operability is checked by comparing the wheel-brake pressure values with predetermined pressure values at an end of the test phases, the fault being detected if a pressure deviation is determined in at least one of the respective wheel brakes;
- and
- means for initiating a secondary braking operation if the fault is detected.
An apparatus for testing a braking system, the braking system including electrically operable valve arrangements, each of the electrically operable valve arrangements being allocated to a respective one of wheel brakes, the apparatus comprising:
- a detecting arrangement for electrically detecting a braking input generated by a driver;
- a converting arrangement for converting the braking input into at least one driving signal;
- a controlling arrangement for controlling a pressure of a pressure supply in the braking system using the electrically operable valve arrangements, the pressure being controlled as a function of the at least one driving signal to generate wheel-brake pressure values;
- a self-test performing arrangement for performing a self-test of the braking system before a start of travel, the self-test including a plurality of test phases, wherein first predetermined actuations of the electrically operable valve arrangements and second predetermined actuations of the pressure supply are allocated to the test phases;
- a checking arrangement for checking an operability of a respective one of the electrically operable valve arrangements to detect a fault during the self-test and for each of the respective wheel brakes, wherein the operability is checked by comparing the wheel-brake pressure values with predetermined pressure values at an end of the test phases, the fault being detected if a pressure deviation is determined in at least one of the respective wheel brakes;
- and
- a secondary braking initiating arrangement for initiating a secondary braking operation if the fault is detected.
Dependencies are inferred from the claim text.