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IPGATE AG · IP Portfolio A · Sub-Portfolio A2
Advanced brake-by-wire technologies — MUX modulation, HDS 1.0, pedal feel simulation, 1-box architecture
Overview
Portfolio A2 expands the IBS innovation base to include MUX-controlled pressure regulation, first-generation highly dynamic pressure control (HDS 1.0 / Plunger Flow Control), pedal feel simulation with on-board diagnostics, sensor integration, and the brake-by-wire system architecture with a single-circuit plunger. Together with Portfolio A1 (IBS Basic), this portfolio forms the complete IBS technology platform of IPGATE AG.
The portfolio contains 5 patent families with 26 patent documents and 61 core inventions in 6 jurisdictions (EP, DE, US, CN, IN, KR). The E102 patent family — covering HDS 1.0, the cascaded plunger flow control architecture — is the central technology platform shared between A1 and A2 and forms the conceptual bridge to Portfolio B (HDS 2.0, E141).
The final family, E132, represents the first complete brake-by-wire system architecture with a single-circuit plunger — a design that became the template for modern one-box electrohydraulic brake systems now deployed by multiple Tier 1 suppliers globally.
Technology Evolution
The patent families in Portfolio A2 document the technological evolution of the IBS platform across four generations.
Fundamentals of MUX-ABS pressure modulation in a closed brake circuit. Map-based state control based on piston stroke, motor current, and p-V characteristic curve. Sequential pressure control with a single actuator. Adaptive pre-pressure control for NVH optimization. All 6 claims of E90DE finally confirmed by the Patent Court.
Introduction of partial/simultaneous operation via a cascaded control architecture (inner loop: piston position/speed; outer loop: target pressure via p-V characteristic curve) and wheel-selective PWM valve modulation. Overcoming the central MUX limitation: simultaneous pressure build-up and release at multiple wheel brakes for the first time.
Four technological channels: plunger flow (E102EP), valve modulation (E102DE/DE1), pressure curve (E102DE2), and pressure model (E102DE4). Bridge to HDS 2.0 via bidirectional volume flow (E102DE2-A35).
E122 established the cost-effective pedal feel simulator (nonlinear return spring with elastomer) and its integration into the closed brake circuit — now standard in 1-box systems. E128 provides compact multisensor integration on a shared circuit board with direct ECU connections — essential for ISO 26262-compliant brake-by-wire systems.
E132 describes the core architecture of modern one-box systems: a single-circuit plunger with safety valves, a central pressure sensor, integrated valve diagnostics, and multifunctional HDS control for ABS/ASR/ACC/AEB and energy recovery.
Patent family E141 (filed in 2015, not included in this portfolio) extends the HDS 1.0 / HPC 1.0 architecture to include the degree of freedom of the exhaust valves. HDS 2.0 / HPC 2.0 combines volume control with time control/PWM of the exhaust valves and forms the bridge to the E200 Combi-Brake for autonomous driving.
Patent Families
A2 builds systematically on the A1 foundations, adding pressure modulation, high-dynamic control, pedal feedback, and complete 1-box integration.
MUX-ABSNovel MUX-controlled pressure modulation for ABS in a closed brake circuit. Map-based state control using piston stroke, motor current, and the pV characteristic curve of the wheel brakes. Adaptive, friction coefficient-dependent pre-pressure control for NVH optimisation. 13 independent claims across EP, DE, US.
HDS 1.0Cascaded control architecture enabling simultaneous and partially simultaneous pressure build-up and release — overcoming the sequential limitation of MUX. Inner loop controls piston speed directly determining pressure gradient; outer loop controls target pressure via pV curve. Wheel-selective PWM valve modulation. 25 core inventions across EP, DE, US, CN, IN, KR.
Pedal FeelActuating device for brake-by-wire with travel simulator connection via shut-off valve and feed valve connected to the brake circuit. Integrated diagnostic method for testing feed valve tightness via targeted pressure build-up. 13 independent claims across DE, US, CN.
SensorsCompact, modular integration of multiple sensor functions — pedal travel, motor rotation angle, piston position, fluid level — directly into the brake actuation unit on a common PCB with direct ECU connection. Addresses installation space optimisation, cost reduction, and ISO 26262 functional safety. 5 independent claims in DE.
1-Box BbWComplete 1-box BbW architecture in which the master cylinder controls the travel simulator while brake pressure is generated by an electrically driven plunger with a single working chamber. The architecture established the template for modern electrohydraulic 1-box brake systems. 5 independent claims; parent granted July 2024, two divisionals granted October 2025.
At a Glance
| Family | Priority | Technology | Claims | Docs | Jurisdictions |
|---|---|---|---|---|---|
| E90 | Nov 21, 2005 | MUX Pressure Modulation | 13 | 4 | EP · DE · US |
| E102 | Feb 13, 2009 | HDS 1.0 — Plunger Flow Control | 25 | 10 | EP · DE · US · CN · IN · KR |
| E122 | Sep 17, 2010 | Pedal Feel Simulator & Diagnostics | 13 | 5 | DE · US · CN |
| E128 | Apr 18, 2011 | Sensor Solutions & PCB Integration | 5 | 3 | DE |
| E132 | Feb 15, 2012 | BbW System Architecture — Plunger | 5 | 4 | DE |
| Total | 2005–2012 | — | 61 | 26 | EP · DE · US · CN · IN · KR |
Glossary
The following terminology is based on the technical publications of IBS Technology (Brake Manual, 5th edition; IBS Technology, Leiber/van Zanten 2025) and is used consistently throughout all portfolio documents.
References
The technical fundamentals of the innovations documented in this portfolio are described in greater detail in the following publications.