Hybrid Transmission Patents: Who Leads, Where the Gaps Are 2026
- Filing has flattened, not grown. activity peaked at 10 families in 2018 and had fallen to 3 by the 2022 midpoint, with the most recent year understated by publication lag.
- Automotive OEMs co-file with each other. the strongest co-assignee pairs all sit above 25 shared families, pointing to joint-venture or supplier-sharing arrangements rather than isolated competition.
- Control claims outweigh mechanical claims. B60W hybrid-control filings (168) and B60K propulsion filings (151) both exceed F16H gearing filings (133), so the contested ground is software-level mode management, not gear hardware.
Filing growth compares 2021 (3 records) with 2024 (3) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field.
What this landscape covers
Hybrid transmission architectures sit at the intersection of mechanical gearing and control software: a single family can claim a planetary gear set, the clutch logic that switches between modes, and the energy-management strategy that decides when the engine decouples from the wheels. This landscape pulls 210 patent families filed between 2015 and 2026 that combine hybrid-transmission terms with mode-switching, engine-decoupling, motor-sizing, energy-management or drivability language, scoped to B60K6, F16H3 and B60W20.
Filing activity peaked in 2018 and has since declined toward the dataset's midpoint, a pattern consistent with a technology whose core mechanical claims were staked out early and whose remaining activity is concentrated in control-layer refinement. Publication lag of roughly 18 months means the final one or two years in any trend chart will always look thinner than they eventually turn out to be.
Filing trend and technology composition
Two views of the same 210 families: how filing volume has moved year over year, and which IPC subclasses carry the claim density.
A peak, then a decline
Filings rose to a peak of 10 in 2018, dropped through the 2022 midpoint of 3, and have not recovered. That trajectory reads as consolidation around established architectures rather than an emerging field still attracting new entrants.
Control subclasses dominate over pure gearing
B60W (hybrid/joint vehicle control, 168 records) and B60K (vehicle propulsion & drive, 151) both outrank F16H (gearing & transmissions, 133), with B60L electric-propulsion claims (41) and engine-control classes (F02D at 17, F02P at 12) trailing further behind. The claim pressure sits on how modes are managed and coordinated, not on the gear sets themselves.
Shares are the percentage of the 210 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Hybrid Transmission Architectures with Eureka
This page is one run against one query. Ask Eureka your own question about hybrid transmission architectures and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records and a representative claim
Multi-mode power split hybrid transmission with two planetary gear mechanisms
A multi-mode, power-split hybrid transmission system having two planetary gear (PG) sets connected to one engine, two electric motors, one output shaft, and each other by several clutches, brakes, and direct connection elements. Depending on the specific location and actuation of the various clutch and brake elements, the system can be run in one of several modes: electric drive, power-split, parallel hybrid, series hybrid, electronic continuously variable transmission (eCVT), generator, neutral, and the like.Filed by The Regents of the University of Michigan, granted 2020-04-14 as US10619707B2.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20090118094A1 | Method for determining input speed acceleration limits in a hybrid transmission | 196 |
| 2 | US20090118971A1 | Method and apparatus for determination of fast actuating engine torque for a hybrid powertrain system | 167 |
| 3 | US20090118954A1 | Method for monitoring an auxiliary pump for a hybrid powertrain | 140 |
| 4 | US20090118928A1 | Control of engine torque for traction and stability control events for a hybrid powertrain system | 138 |
| 5 | US20090118943A1 | Method and apparatus to determine a preferred output torque in mode and fixed gear operation with clutch torq… | 135 |
| 6 | EP0937600A2 | Hybrid transmission, vehicle and bicycle using the same | 131 |
| 7 | US20090118937A1 | Method for operating a powertrain system to transition between engine states | 127 |
| 8 | US20090118933A1 | Method to compensate for transmission spin loss for a hybrid powertrain system | 125 |
| 9 | US20050102082A1 | Shift control system of hybrid transmission | 122 |
| 10 | US20090221390A1 | Hybrid Transmission for Hybrid Vehicles | 68 |
Citation counts favour older filings inside any searched corpus; treat this table as a map of influence on later filers, not a ranking of current relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three patterns worth acting on before drafting a new application in this space.
The mechanical land grab is largely over
Volume peaked at 10 families in 2018 and had fallen to 3 by 2022, with the last recorded year at 0 (partial, subject to publication lag). New entrants filing broad architecture claims now compete against nearly a decade of prior art on planetary-gear mode switching.
Control logic is the contested layer
More families claim hybrid/joint vehicle control (B60W) than pure gearing (F16H). Energy-management and mode-decision algorithms are where fresh claim space is still being tested, even as the underlying gear architectures repeat.
OEM alliances file jointly, not independently
The strongest co-assignee pairs each share 26 families, all among established passenger-vehicle manufacturers. That points to joint development programmes producing shared filings rather than each OEM building an independent portfolio.
Europe leads receiving-office volume
Europe (EPO, 79) and the United States (39) account for the bulk of filings, with India (27), Germany (21), China (16) and Japan (10) trailing. A European-first filing strategy currently faces the densest prior art.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to hybrid transmission architectures, with the prior art for and against each one.
Who holds the ground, and where it is thin
Recent-year momentum figures show zero new filings from every tracked assignee in the latest recorded year — consistent with the overall decline, and with publication lag masking activity not yet visible in the data.
Momentum has stalled across the board
Every assignee tracked for recent-year momentum, including the largest portfolio holders, shows zero filings in the latest year. This is consistent with the broader decline from the 2018 peak, though the newest year is also the one most affected by publication lag.
Joint filings cluster among a small group
Three separate co-assignee pairs each share 26 families, all drawn from the same small set of established manufacturers. That concentration suggests cross-licensing or joint-venture architecture programmes rather than arm's-length competition.
Early filings still anchor the field
The most-cited record in this corpus draws 196 citations, and the next four most-cited records all originate from the same generation of hybrid powertrain filings. Later entrants have been designing around, or building on, this same cluster for over a decade.
| Assignee | Recent year | YoY |
|---|---|---|
| GM Global Technology Operations LLC | 0 | — |
| Nissan Motor Co., Ltd. | 0 | — |
| Mercedes-Benz Group AG | 0 | — |
| Chrysler LLC | 0 | — |
| Bayerische Motoren Werke AG (BMW AG) | 0 | — |
| TM4 Inc. | 0 | — |
| Renault SAS | 0 | — |
| TVS Motor Company Limited | 0 | — |
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, portfolio strategy, or spotting an open filing angle.
Check freedom-to-operate against the most-cited cluster
Before drafting claims on mode-switching or engine-decoupling logic, run a citation check against the top-cited records in this corpus; they anchor most of what followed.
Explore prior art in Patsnap EurekaMap the co-assignee network in full
The strongest co-assignee pairs point to joint development programmes. A full network view shows whether a target company files independently or inside an alliance.
Trace assignee relationships in Patsnap EurekaTest claims in the under-claimed sub-areas
Control-layer branches like auxiliary pump monitoring and clutch-torque constraint estimation show thinner density than the core architecture claims.
Draft and search claims in Patsnap EurekaCommon questions about hybrid transmission patents
Filing in this dataset is concentrated among a small group of established passenger-vehicle manufacturers, several of which co-file with each other rather than compete independently. The strongest co-assignee pairs each share 26 families, which points to joint development programmes rather than isolated portfolios. Rather than a single dominant holder, the picture is a cluster of allied OEMs with overlapping claim coverage; a full assignee ranking is the more reliable way to see the exact order than any summary list.
Filing volume peaked at 10 families in 2018 and had declined to 3 by the 2022 midpoint, with the most recent recorded year showing zero new filings. That is a flat-to-declining trend on raw counts, though the newest one to two years are always understated because publication typically lags filing by around 18 months. The safest reading is that core mechanical architecture claims were staked out earlier in the period, with remaining activity concentrated in control-layer refinement rather than new mechanical designs.
US10619707B2, assigned to The Regents of the University of Michigan and granted in 2020, covers a multi-mode power-split hybrid transmission using two planetary gear sets connected to one engine, two electric motors and one output shaft through a specific arrangement of clutches, brakes and direct connections. Depending on which clutch and brake elements are actuated, the system can run in electric drive, power-split, parallel hybrid, series hybrid, eCVT, generator or neutral modes. Anyone designing a dual-planetary multi-mode transmission needs to check their clutch/brake actuation logic against this claim structure specifically, not just the general concept of power-split hybrids.
Relative to the dense claim coverage on core mode-switching and planetary-gear architecture, several control-adjacent branches show thinner filing density: clutch-torque constraint estimation, auxiliary pump condition monitoring, and drivability tuning during fixed-gear to mode transitions. These sit closer to the engine-control and monitoring layers (F02D, F02P) which have far fewer records than the core B60W and B60K classes. That gap does not guarantee an open path to grant, but it is where claim space is comparatively less occupied.
In this dataset, B60W (hybrid/joint vehicle control, 168 records) and B60K (vehicle propulsion and drive, 151) both outnumber F16H (gearing and transmissions, 133). That distribution reflects where the differentiating engineering work now happens: the mechanical gear architectures such as planetary sets and clutch arrangements are comparatively well established, while the control logic that decides when and how to switch modes, manage energy flow and coordinate the engine and motors is where filers are still actively claiming new ground.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.