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.


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    Title :

    Electropneumatic brake system having a test mode for the pneumatic backup brake circuit


    Contributors:

    Publication date :

    2022-04-12


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B60T Bremsanlagen für Fahrzeuge oder Teile davon , VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF