E145 – Floating Piston
Brake System with HDS 2
Floating piston master cylinder unit with MUX 2.0 highly dynamic pressure control and THZ self-diagnosis. 7 independent inventions · 5 granted rights · EP · US · CN · DE
| Applicant | IPGATE AG, Churerstraße 160a, 8808 Pfäffikon (CH) |
| Inventors | Heinz Leiber, Dr. Thomas Leiber |
| Priority / Filing Date |
March 16, 2015 (DE202015107072.1, DE202015107075.6, DE202015107079.9) April 21, 2015 (DE202015107081.0) |
| PCT Application | PCT/EP2015/081401 |
| Technology | Floating piston brake system with novel MUX 2.0 control (HDS 2) and THZ self-diagnosis |
| Innovations | 7 independent inventions (device + method) |
Floating Piston Brake System
with HDS 2 & THZ Diagnosis
Patent family E145 claims a complete brake system integrating the second-generation HDS (MUX 2.0) pressure control into a floating piston master cylinder architecture — extending the scope beyond pure control methods to cover the combined brake system and self-diagnosis.
The E145 builds on two predecessor patent families: E102 defines the basic principle of highly dynamic pressure control (HDS generation 1) — volume control with a plunger as a bidirectional control element and PWM valve modulation for wheel-selective pressure regulation. E141 (used as priority for E145) expands the control system in multiple dimensions: pressure reduction via outlet valves as an additional degree of freedom, three pump types, and a solution to the volume problem with single-stroke pistons.
While E141 protects the control method (HDS 2) in isolation, E145 goes a decisive step further: it claims a complete brake system with a floating piston master cylinder unit in which HDS 2 (referred to as MUX 2.0) is systemically integrated. The scope of protection is therefore broader — encompassing the combination of brake system architecture and control strategy. E145 further introduces two novel THZ diagnostic methods that, for the first time, functionally monitor the mechanical return element (floating piston) during both driving and parking modes.
HDS Generations & Nomenclature
The Highly Dynamic pressure control System (HDS) is a proprietary IPGATE control strategy for electrohydraulic brake actuators. E145 implements HDS generation 2 in three pump-type variants, collectively referred to as MUX 2.0 in the context of this patent family.
| Variant | Pump Type | Control Strategy |
|---|---|---|
| HDS 2.1 | Plunger | Volume control — pressure build-up/reduction + outlet valve(s) |
| HDS 2.2 | Double-acting piston (DHP) | Volume control — pressure build-up/reduction + outlet valve(s) |
| HDS 2.3 | Rotary pump | Volume control only — pressure build-up + outlet valve(s) for reduction |
Three Core Innovation Areas
The seven independent inventions of E145 fall into three thematic groups, each addressing a distinct functional aspect of the integrated brake system.
Independent Claims, Descriptions & Keywords
Each independent claim is listed separately. 5 granted property rights across US, EP, CN, and DE with overlapping claim scope covering device and method inventions.
| File · Claim | Cat. | Description | Keyword |
|---|---|---|---|
| E145WOUS C1 US10,688,979 B2 |
Device | Floating piston brake system with HDS 2 – simultaneous volume control of the pressure supply and pressure reduction via outlet valves for wheel-specific pressure build-up/reduction in highly dynamic braking situations (ABS/ESP). | HDS 2 · Volume control · Simultaneous |
| E145WOUS C34 US10,688,979 B2 |
Method | Method for testing tightness and mobility of the floating piston during driving. Radial channel in the master brake cylinder, pressure difference moves the floating piston; test path profile compared with target value profile. | THZ diagnosis · Channel · Test path profile |
| E145WOUS C39 US10,688,979 B2 |
Method | Method for testing the floating piston in parking mode. Pressure stored in second brake circuit, reduced in first circuit, valves opened — floating piston moves due to pressure difference until pressure equalization is reached. | THZ parking · Pressure storage · Equalization |
| E145WOCN C1 CN107428325B |
Device | CN equivalent of HDS 2 pressure control: brake device with floating piston master cylinder, combined volume and valve control for simultaneous highly dynamic pressure changes in the wheel brakes. | HDS 2 · Volume control · Simultaneous |
| E145WOCN C34 CN107428325B |
Method | CN equivalent of THZ driving diagnosis: method for testing the mobility and tightness of the floating piston via radial channel, pressure-volume curve, and comparison with a theoretical curve. | THZ diagnosis · Pressure-volume curve |
| E145WOCN C36 CN107428325B |
Method | High-pressure relief procedure at pressures ≥100 bar: multi-stage release via pressure relief valve, forward stroke and return stroke of the double-acting piston with pressure-volume control, followed by repositioning. | Pressure relief · ≥100 bar · Multi-stage |
| E145WOEP C1 EP3271227B1 |
Device | EP equivalent of HDS 2: floating piston brake system with simultaneous volume and valve control for highly dynamic pressure changes in ABS/ESP scenarios. Scope does not include THZ diagnosis claims. | HDS 2 · Volume control · ABS/ESP |
| E145WOEP1 C14 EP21202586.0 |
Device | EP partial application: HPC 2.1 extended pressure control with active volume control for vibration reduction and cross-wheel pressure control. Fully by-wire capable. Broadens scope of original EP claim. | HPC 2.1 · Vibration damping · By-wire |
Jurisdictions & Status
All members of the E145 patent family as of February 2026. All five rights are granted or registered.
| File No. | Country | Status | Type | Registration No. | Filed | Grant No. | Granted |
|---|---|---|---|---|---|---|---|
| E145WOUS | US | Granted | Patent | 15/558,376 | Dec. 30, 2015 | US 10,688,979 B2 | Jun. 23, 2020 |
| E145WOEP | EP | Granted | Patent | 15817422.7 | Dec. 30, 2015 | EP 3271227 B1 | Oct. 20, 2021 |
| E145WOEPDE | DE | Granted | Patent (via EP) | 15817422.7 | Dec. 30, 2015 | 502015015331.8 | Oct. 20, 2021 |
| E145WOCN | CN | Granted | Patent | 201580077961.5 | Dec. 30, 2015 | CN 107428325 B | May 14, 2021 |
| E145GDE | DE | Registered | Utility Model | 202015008975.5 | Dec. 30, 2015 | DE 202015008975 | Jul. 21, 2016 |
