Brake-by-wire refers to the electronic control architecture that replaces or supplements mechanical/hydraulic linkage between the pedal and the brake actuators, while regenerative braking specifically covers recovering kinetic energy through the electric motor during deceleration. Many patents in this dataset cover both together because a brake-by-wire controller has to blend friction braking with regenerative torque smoothly, which is the 'blending control' function the search specifically targets. A patent can claim one without the other, but the commercially relevant filings increasingly treat them as a single control problem.

The most-cited records in this dataset date back to the 1990s and cover fail-safe brake management and electro-hydraulic brake apply systems with pedal simulation, and they are cited far more heavily than any recent filing. This reflects citation-age bias inherent to any patent search — older filings have simply had more years to accumulate citations. Current commercial relevance should be judged separately, using recent assignee activity and claim scope rather than citation count alone.

Filing activity rose from 2 families in 2017 to a peak of 17 in 2022, but has not exceeded that peak since, which points to a plateau rather than continued growth. Because publication lags filing by roughly 18 months, the most recent one to two years will always understate true activity, so this should be revisited once later filings have had time to publish. Even accounting for that lag, the shape of the trend suggests a maturing field rather than an early-stage one.

The clearest under-claimed areas sit at the intersection of core braking control and adjacent subclasses that appear only a handful of times in this dataset, including gearing/transmission integration (F16H), digital-processing-heavy failure classification (G06F), and joint vehicle control blending (B60W). These low counts do not guarantee an easy filing, but they indicate the claim space is far less crowded than core B60T redundancy and pedal-simulation claims, where dense prior art dating back decades makes novel claims harder to draft.

The United States receives the largest share of filings in this dataset at 53 records, followed by the European Patent Office at 19 and China at 17, with India, WIPO/PCT and the UK each contributing single-digit counts. A freedom-to-operate search limited to the US alone would miss a substantial share of relevant prior art, particularly in Europe and China where combined filings approach the US total. Any clearance or competitive analysis should cover all three major offices.