State of charge as a switch: the OMNIA Drive claim
The third patent family on this site is the one most often misread. Its title — power generating system and method for a vehicle — invites a reader to assume a claim about where energy comes from. The granted claim is not about that at all. It is about routing: a processing unit reads the state of charge of the storage device and, on that basis, selects which source feeds the traction motor, while the generator path charges the storage device at the same time. The energy question sits outside the claim, and is dealt with separately.
What claim 1 actually says
Granted text — the independent claim of US 11,117,476 B2 recites a first generator producing a first electric power, and a power processing unit built from converters, a booster, a regulator and a processor. The operative part is the decision rule [1]:
… read a state of charge (SOC) of said at least one energy storage device, generate a sustained second electric power: from said first electric power if the SOC of said energy storage device is less than a predetermined SOC value; from said second electric power or a combination of said first electric power and said second electric power if the SOC of said energy storage device is greater than or equal to said predetermined SOC value, and simultaneously provide said sustained first electric power to said at least one energy storage device, and said sustained second electric power to a motor of said vehicle …
Two currents leave the processing unit at once. One goes to the storage device. The other goes to the motor. The claim fixes what the motor's supply is made from, and makes that a function of a single measured variable.
The rule, stated plainly
Derived — reading the claim directly, the behaviour is:
| Measured condition | What feeds the motor | What the storage device receives |
|---|---|---|
| SOC below the predetermined value | The generator path | The generator path |
| SOC at or above the predetermined value | The storage device, or the generator and the storage device together | The generator path |
The storage device is charged in both states. What changes with state of charge is whether the pack is also being asked to discharge into the motor at the same time. Below the threshold it is not; above it, it is, alone or in parallel with the generator path. Derived — the claim therefore describes a system that declines to draw traction current from a pack that has fallen below a set level, and instead lets it recover while the generator path carries the load.
What the claim does not say
This is the part worth stating explicitly, because the family's title does not.
Derived — the claim does not specify what drives the first generator. The first electric power is an input to the claimed system. Where it comes from, what turns the generator, and what that costs are all outside the boundary the claim draws. Nothing in the claim asserts an energy balance, and nothing on this page should be read as asserting one. A system of this shape consumes energy to run, in the ordinary way, and the accounting for that is a question about the installation rather than about the claim.
That accounting has its own page. Where the energy comes from sets out the three-way test any on-board energy proposal has to pass, and it applies here exactly as it applies anywhere else. A granted claim to a routing architecture is not, and cannot be, an answer to it.
Derived — the claim also asserts no efficiency, no range figure and no comparison against any other topology. It recites structure and a control rule. Anyone evaluating the family should read it as that, and should ask for measurements separately.
Why the state-of-charge rule is the interesting part
The reason a threshold rule is worth claiming at all is that a battery's useful life is sensitive to where in its window it is worked, not only to how much it is worked.
Design estimate — holding a pack off the traction load once it drops below a set level keeps it out of the low-state-of-charge region where internal resistance is highest and where a heavy discharge produces the largest voltage sag and the most heat. The companion argument on the charge side is set out in the charge asymmetry: the hard electrochemical boundary in a lithium cell sits on the charge side, and it narrows when the cell is cold. A rule that governs when the pack is charged and when it is discharged is acting on both.
Whether it does so to a degree that matters in a particular vehicle is a measurement, and no such measurement is claimed here. The independent testing on this estate — at CIRT Pune and at DRDO R&DE (Engineers) — was carried out on the Hybrid Power Pack, a different family, and is recorded against that family in the patent register. It is not evidence about this one.
Where this family is granted
Granted text — the OMNIA Drive family is granted and in force in India (IN 477613, 6 December 2023), the United States (US 11,117,476 B2, 14 September 2021) and Japan (JP 7,109,623, 21 July 2022). Jurisdictions are named rather than counted, and grant and in-force status are recorded as two separate facts, on the patent register. The international application published as WO 2017/051299 A1 [2].
Summary
The OMNIA Drive claim is a claim to a control architecture. It reads one variable — the state of charge of the storage device — and uses it to choose the motor's source, while charging the storage device from the generator path throughout. It says nothing about where the generator's input comes from, and it should not be quoted as though it did. Read as what it is, it is a specific and checkable piece of engineering; read as an energy claim, it is being asked to carry something it never states.
References
[1] US 11,117,476 B2, Power generating system and method for a vehicle, granted 14 September 2021. Claim 1.
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[2] WO 2017/051299 A1, Power generating system and method for a vehicle, international publication.
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