IP High Court, Reiwa 6 (Gyo-Ke) 10018 [Motor vehicle] <Presiding Judge Miyasaka>
更新日：3 日前
Article information
Article type: Case note
Category: Patents
Issues: Inventive step; Motivation and teaching away; Design choices
First published on this website: 2026-10-03
Display and classification checked: 2026-10-03
IP High Court, Reiwa 6 (Gyo-Ke) 10018 [Motor vehicle] <Presiding Judge Miyasaka>
= Reiwa 5 (Ne) 10042 <Presiding Judge Miyasaka>
The invention prohibits operation of the engine-stop device when a malfunction is detected.
The invention of Ko 1 (a vehicle equipped with idle-stop and brake-holding devices) and the matters described in Ko 5 (abnormality detection and warning for a hill-start assist device) share the same technical field: both concern vehicles equipped with a brake-holding device and using a function that maintains the applied-brake state.
A malfunction of the brake-holding device is also an anticipated problem in the Ko 1 invention. As it is clear that brake hydraulic pressure cannot be maintained if that device has an abnormality, there is motivation to add the matters described in Ko 5 (an abnormality-detection signal) to solve that problem.
The Ko 1 invention has the technical concept of resolving problems such as sudden starts when restarting after idle-stop by operating the brake-holding device.
Accordingly, when the brake-holding device has failed and cannot operate, a person skilled in the art could readily have adopted a configuration using that detection result as a condition for idle-stop and prohibiting its operation (difference 3).
Whether merely to issue a warning on malfunction (Ko 5), prohibit operation of the device (the invention), or do both is a design matter.
⇒ No inventive step.
Update and correction history
Substantive corrections, additions, classification, related-article and display changes are recorded separately from the website's first-publication date.
2026-10-03: First publication from the LinkedIn original; article information, issue tags, language navigation and consultation guidance were added.
2026-10-13: aligned the canonical and search-index URLs with the published URL. The original article text was not changed.
2026-10-13: aligned related-article, topic-guide, and other managed links with the articles’ published URLs. The original article text was not changed.
