E132 — 1-Box BbW Architecture — Single-Circuit Plunger

Patent application E132 (DE 10 2012 002 791, published Aug. 22, 2013, Applicant: IPGATE AG, Inventor: H. Leiber) describes an electrohydraulic brake-by-wire actuation unit in which the mechanically actuated master cylinder does not serve to generate pressure directly, but is used to control a travel simulator. The actual brake pressure is generated by an electrically driven booster unit with a plunger piston, which is connected to the wheel brakes and the reservoir via separate valve paths.

The E132 patent family is among IPGATE AG's earliest intellectual property rights in the field of brake-by-wire system architecture with a single-circuit plunger. It builds upon the brake actuation device described in DE 10 2010 040 097 A1 and creates a significantly simplified architecture that, in particular, requires fewer valves. The invention addresses the core functions of modern one-box braking systems: brake force amplification, ABS/ASR control, driver assistance functions (ACC, AEB), regenerative braking, and diagnostic capability.

This architecture has become established in modern electrohydraulic one-box brake-by-wire systems and is used in particular for driver assistance functions (Automatic Cruise Control ACC, Automatic Emergency Braking AEB) and regenerative braking, demonstrating improvements in ABS performance at low friction coefficients (low-µ).

Three divisional applications were filed from the parent application DE 10 2012 002 791 B4 (granted July 25, 2024): DE 10 2012 025 960.3 (E132DE1, still under examination), DE 10 2012 025 961.1 (E132DE2, granted on October 2, 2025), and DE 10 2012 025 970.0 (E132DE3, granted on October 2, 2025). An opposition was filed against patent E132DE (DE 10 2012 002 791 B4).

Five independent inventions across four patents, covering the fundamental 1-box architecture and three functional extensions (volume management, diagnostics, multifunctional HDS control).