The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 12, 2022
Filed:
Sep. 13, 2018
Knorr-bremse Systeme Fuer Nutzfahrzeuge Gmbh, Munich, DE;
Michael Herges, Munich, DE;
Martin Vorreiter, Vaihingen, DE;
Frank Werner, Ditzingen, DE;
Matthias Reichert, Hemmingen, DE;
KNORR-BREMSE SYSTEME FUER NUTZFAHRZEUGE GMBH, Munich, DE;
Abstract
An electropneumatic brake system (EBS) of a vehicle, which electronically controls a brake-pressure, including: a) a service-brake actuating-element, which is actuatable by a driver, of a service-brake-actuating-device, which has an electrical-channel and at least one pneumatic-channel, wherein, depending on the actuation of the service-brake-actuating-element, an electrical-brake-request-signal, representing a setpoint-brake-pressure, is generated in the electrical-channel and a pneumatic-backup-pressure is generated in the pneumatic-channel; b) a first electronic-control-system, which, depending on a brake-request-signal output by the electrical-channel, outputs an electrical-brake-control-signal; c) at least one electropneumatic-pressure-control-module, which, depending on the electrical-brake-control-signal, outputs an actual-brake-pressure, in the course of a brake-pressure-control adjusts the actual-brake-pressure to the setpoint-brake-pressure and inputs this into at least one pneumatic-brake-actuator; d) wherein the pressure-control-module includes at least one electromagnetic-control-valve-device (EV, AV), at least one relay-valve (RLV), at least one electromagnetic-backup-solenoid-valve (BV), a second electronic-control-system and at least one pressure-sensor (DS), wherein, depending on the electrical-brake-control-signal, the electromagnetic-control-valve-device (EV, AV) generates a control-pressure for a control-input of the relay-valve (RLV), which, depending on the control-pressure, generates an actual-brake-pressure for the at least one pneumatic-brake-actuator, which the pressure-sensor (DS) measures/reports to the second electronic-control-system of the pressure-control-module, e) wherein the electromagnetic-control-valve-device (EV, AV) and the at least one electromagnetic-backup-solenoid-valve (BV) are electrically-controlled by the second electronic-control system, f) wherein the electromagnetic-backup-solenoid-valve (BV) is connected by an input to the pneumatic-channel and by an output to the control-input of the relay-valve (RLV) and can be switched between a pass-through-position, in which the input is connected to the output, and a shut-off position, in which the input is shut-off with respect to the output, g) wherein the electromagnetic-control-valve-device (EV, AV) connects the control-input of the relay-valve (RLV) to a pressure-sink or to a compressed-air-supply or shuts it off from the pressure-sink and from the compressed-air-supply, h) wherein a pneumatic-backup-brake-circuit of the electropneumatic-brake-system includes at least the pneumatic-channel of the service-brake-actuating-device, the relay-valve (RLV), the at least one electromagnetic-backup-solenoid-valve (BV) and at least one pneumatic-line connecting the at least one pneumatic-channel to the input of the at least one electromagnetic-backup-solenoid-valve (BV), and i) wherein an electrical-brake-circuit of the electropneumatic-brake-system includes at least the electrical-channel of the service-brake-actuating-device, the first electronic-control-system, the second electronic-control-system, the electromagnetic-control-valve-device (EV, AV), the at least one electromagnetic-backup-solenoid-valve (BV), the relay-valve (RLV) and the pressure-sensor (DS), j) wherein test routines of a test-mode that are configured so that the following test-mode-conditions are cumulatively satisfied when the electrical-brake-circuit is intact and the test-mode is activated are implemented in the first electronic-control-system and/or in the second electronic-control-system: j1) when a vehicle is being driven, the service-brake-actuating-device is actuated by the driver so that a partial-braking, deviating from emergency-braking or full-braking, is performed, and j2) a difference between the backup-pressure generated in the pneumatic-channel and a first pressure-value is greater than the actual-brake-pressure measured by the at least one pressure-sensor (DS), k) wherein the brake-pressure-control ends and the electromagnetic-control-valve-device (EV, AV) and the electromagnetic-backup-solenoid-valve (BV) are switched into a test-switching-state, in which the control-input of the relay-valve (RLV) is shut-off by the electromagnetic-control-valve-device (EV, AV) from the compressed-air-supply and from the pressure-sink and the electromagnetic-backup-solenoid-valve (BV) is switched from the shut-off-position into the pass-through-position, and l) if the pressure-gradient of the brake-pressure measured by the at least one pressure-sensor (DS), l1) is greater than zero, a first signal, representing an intact-backup-brake-circuit, is generated, or l2) is equal to zero or less than zero, a second signal, representing a defective backup-brake-circuit, is generated, or m) then a difference between the backup-pressure generated in the pneumatic-channel and a second pressure-value is greater than the actual-brake-pressure measured by the pressure-sensor (DS), the second-signal, representing a defective backup-brake-circuit, is generated.