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IPGATE AG · IP Portfolio B · B2
| Inventors | Heinz Leiber, Dr. Thomas Leiber |
| Priority | March 2015 |
| Portfolio | IP Portfolio B · B2 |
| Innovations | 11 independent inventions |
| Jurisdictions | EP (×3), CN (×2), US (×2 granted), JP granted, DE utility model; 1 US pending |
Patent family E146 claims a complete electrohydraulic brake-by-wire system with a double-acting piston (DAP) pressure supply unit and highly dynamic bidirectional pressure control (MUX 2.0 / HDS 2.2) — extending beyond E145 by exploiting both the forward and return strokes of the piston for pressure build-up and reduction.
While E141 protects the HDS 2 control method in isolation and E145 claims the complete brake system in the HDS 2.1 configuration (plunger), E146 advances to the HDS 2.2 configuration with a double-acting piston (DAP) as the pressure supply unit. The DAP enables bidirectional pressure control — pressure build-up in the forward stroke and pressure reduction in the return stroke — creating new degrees of freedom compared to the single-stroke plunger.
E146 extends the scope of protection to cover reduced valve costs via novel bidirectional inlet valves, model-based multi-wheel pressure control using stored pressure-volume characteristics, THZ floating piston diagnostics, and high-pressure relief procedures for pressures ≥ 100 bar. The family spans 5 jurisdictions with 9 granted rights, covering 11 independent claims total.
E146 is the second complete system patent in the HDS 2 generation (alongside E145), specifically realizing the HDS 2.2 variant with a double-acting piston. The three HDS 2 pump-type variants are defined as: HDS 2.1 (plunger, E145), HDS 2.2 (double-acting piston, E146), and HDS 2.3 (rotary pump).
The 11 independent inventions of E146 are organized into 7 invention complexes covering the DAP pressure control system, valve architecture, model-based control, diagnostics, and safety functions.
Invention Overview
| Invention | Cat. | Description | Keyword |
|---|---|---|---|
| EK 1 – DAP Core SystemEP3271221B1 · US11760329B2 · JP6827946B · DE202015008976 | Device | Electrohydraulic BBW system with double-acting piston (DAP) pressure supply. The DAP limits two working chambers and is operated in both directions: pressure build-up in the forward stroke, pressure reduction in the return stroke by enlarging volume. | DAP · Two working chambers · Bidirectional pressure control |
| EK 2 – DAP Pressure ReductionEP4292893B1 · CN113696868B | Method | Targeted DAP pressure reduction via pressure-volume control. The DAP reduces brake pressure by controlled volume change: in the return stroke by enlarging the first working chamber, in the forward stroke by enlarging the second working chamber. | Pressure reduction · Volume control · Return/forward stroke |
| EK 3 – Simultaneous ControlEP24194897.5 | Device | Three independent inventions: (A1) simultaneous pressure reduction via piston and outlet valve time control; (A2) simultaneous pressure build-up AND reduction; (A5) simultaneous build-up/reduction via DAP with two working chambers. | Simultaneous control · Three DOF · Time-controlled outlet valves |
| EK 4 – Valve-Reduced ArchitectureCN107531216B · CN113696868B | Device | Max. one outlet valve per brake circuit (50% valve reduction vs. conventional ABS). Bidirectional inlet valves: hydraulic medium flows from the brake circuit via the armature chamber to the valve seat and on to the wheel cylinder. | 1 AV per circuit · Bidirectional inlet valve · Armature chamber |
| EK 5 – Model-Based ControlCN107531216B · US11760329B2 | Method | Model-based multi-wheel pressure control using stored pressure-volume characteristics per wheel brake; control device calculates required piston stroke for each pressure change and applies individually timed valve openings for simultaneous multi-wheel target pressures. | P-V characteristic · Piston stroke · Simultaneous multi-wheel |
| EK 6 – THZ DiagnosisCN107531216B · CN113696868B | Method | Floating piston tightness and mobility monitoring during driving (via radial channel pressure difference and pressure-volume curve comparison) and parking (via pressure storage in second circuit, reduction in first, valve opening, and equalization analysis). | Floating piston · Radial channel · Pressure equalization |
| EK 7 – High-Pressure ReliefCN107531216B · CN113696868B | Method | Active bidirectional pressure reduction at pressures ≥ 100 bar. Multi-stage procedure via pressure relief valve, forward and return stroke combinations of the DAP with closed-loop pressure measurement and volume control. | Pressure relief · ≥100 bar · Multi-stage DAP strokes |
Family Overview
| File No. | Country | Status | Type | Application No. | Filed | Grant No. | Granted |
|---|---|---|---|---|---|---|---|
| E146WOEP | EP | Granted | Patent | 15823175.3 | Dec. 30, 2015 | EP3271221B1 | Nov. 1, 2023 |
| E146WOEP1 | EP | Granted | Divisional | 23207002.9 | Dec. 30, 2015 | EP4292893B1 | Jun. 18, 2025 |
| E146WOEP2 | EP | Granted | Divisional | 24194897.5 | Dec. 30, 2015 | EP4446182B1 | Feb. 4, 2026 |
| E146WOCN | CN | Granted | Patent | 201580077962.X | Dec. 30, 2015 | CN107531216B | Aug. 3, 2021 |
| E146WOCN1 | CN | Granted | Divisional | 202110785648.4 | Dec. 30, 2015 | CN113696868B | Mar. 19, 2024 |
| E146WOUS | US | Granted | Patent | 15/558,419 | Dec. 30, 2015 | US11,760,329 B2 | Nov. 19, 2023 |
| E146WOUS1 | US | Granted | Divisional | 18/235,567 | Dec. 30, 2015 | US12,384,348 B2 | Aug. 12, 2025 |
| E146WOUS2 | US | Pending | Divisional | 18/411,652 | Dec. 30, 2015 | — | — |
| E146WOJP | JP | Granted | Patent | 2017-548870 | Dec. 30, 2015 | JP6827946B2 | Jan. 22, 2021 |
| E146GDE | DE | Registered | Utility Model | 202015008976.3 | Dec. 30, 2015 | — | — |
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