# US 11,299,136 B2 · Electropneumatic braking system architecture without direct pneumatic service brake redundancy on the rear axle (1P1E) > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,299,136 B2 - Document ID: US11299136B2 - Status: Granted - Kind: B2 - Application number: 17/287,528 - Filed: 2019-10-01 - Published: 2021-12-16 - Granted: 2022-04-12 - Earliest claimed: 2018-10-23 - Assignees: Zf Cv Systems Europe BV - Applicants: ZF CV Systems Hannover GmbH - Inventors: Julian Van Thiel - Web page: https://patentgrep.com/patent/US11299136B2 ## CPC - B60T 13/683: {in pneumatic systems or parts thereof (in vacuum systems B60T13/72)} - B60T 13/38: Brakes applied by springs or weights and released by compressed air {(B60T13/261 takes precedence)} - B60T 15/027: {in pneumatic systems} - B60T 15/20: controlled by two fluid pressures - B60T 2270/413: Plausibility monitoring, cross check, redundancy - B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES ## Abstract A redundancy module for a pneumatic braking system of a vehicle, in particular a commercial vehicle, with spring brakes on at least one axle, includes: a parking brake pressure port for receiving a parking brake pressure; a spring brake port for providing a spring brake pressure; a redundancy pressure port for receiving a redundancy pressure; and a piston assembly, with a reverse piston having a parking brake pressure control surface, a spring brake control surface, and a redundancy pressure control surface. The parking brake pressure acting on the parking brake pressure control surface causes a control of the spring brake pressure in a same direction. The redundancy pressure acting on the redundancy pressure control surface causes an inverse control of the spring brake pressure. ## Claims ### Claim 1 A redundancy module for a pneumatic braking system of a vehicle, in particular a commercial vehicle, with spring brakes on at least one axle, comprising: a parking brake pressure port configured to receive a force exerted by a parking brake pressure exerted in a first direction; a spring brake port configured to provide a force exerted by a spring brake pressure in the first direction; a redundancy pressure port configured to receive a redundancy pressure; and a piston assembly, with a reverse piston having a parking brake pressure control surface, a spring brake control surface, and a redundancy pressure control surface, wherein the parking brake pressure acting on the parking brake pressure control surface causes a control of the spring brake pressure, and wherein the redundancy pressure acting on the redundancy pressure control surface causes an inverse control of the spring brake pressure. ### Claim 2 (depends on 1) The redundancy module of claim 1, wherein the reverse piston is configured to contact a ventilation valve seat, and wherein fluid flows over the ventilation valve seat when the parking brake pressure acting on the parking brake pressure control surface exceeds the spring brake pressure acting on the spring brake control surface. ### Claim 3 (depends on 1) The redundancy module of claim 1, further comprising: a venting piston configured to contact a venting valve seat and either block or release a venting port. ### Claim 4 (depends on 3) The redundancy module of claim 3, wherein the venting piston is biased against the venting valve seat by spring loading. ### Claim 5 (depends on 3) The redundancy module of claim 3, wherein a ventilation valve seat is formed on the venting piston. ### Claim 6 (depends on 5) The redundancy module of claim 5, wherein the redundancy pressure is applicable to the redundancy control surface to cause a flow of fluid from the spring brake port over the venting valve seat. ### Claim 7 (depends on 5) The redundancy module of claim 5, wherein the redundancy pressure is applicable to the redundancy control surface in order to move the reverse piston together with the venting piston and to lift the venting piston off from the venting valve seat. ### Claim 8 (depends on 5) The redundancy module of claim 5, wherein the venting valve seat is arranged radially outside the ventilation valve seat. ### Claim 9 (depends on 1) The redundancy module of claim 1, further comprising: an electropneumatic redundancy valve with a first redundancy valve port forming or connected to the redundancy pressure port, a second redundancy valve port connected to a redundancy pressure chamber, and with a third redundancy valve port connected to a vent. ### Claim 10 (depends on 9) The redundancy module of claim 9, wherein the redundancy valve is biased in a first deenergized state, in which the first redundancy valve port is connected to the second redundancy valve port and is transferrable by a redundancy signal to a second state, in which the second redundancy valve port is connected to the third redundancy valve port. ### Claim 11 (depends on 10) The redundancy module of claim 10, wherein the redundancy signal is provided by a parking brake module, a central module, or a service brake. ### Claim 12 (depends on 10) The redundancy module of claim 10, wherein the redundancy valve and the piston assembly are integrated in a module. ### Claim 13 (depends on 1) A pneumatic braking system for a vehicle, in particular a commercial vehicle, comprising: a parking brake circuit; and the redundancy module of claim 1 in the parking brake circuit. ### Claim 14 (depends on 13) The pneumatic braking system of claim 13, further comprising: an electropneumatic parking brake module with a parking brake port configured to provide the parking brake pressure, which is connected to the parking brake port; and at least one spring brake which is connected to the spring brake port. ### Claim 15 (depends on 13) The pneumatic braking system of claim 13, further comprising: a brake encoder with a pneumatic brake encoder port which is connected to the redundancy pressure port so as to provide the redundancy pressure. ### Claim 16 (depends on 13) A vehicle, in particular a commercial vehicle, comprising: the pneumatic braking system of claim 13.