established · computed
Vacuum-actuated switch controls hydrogen flow shutoff when engine stops
Switch 33 (electrical shut-off control) is responsive to vacuum control switch 60: engine vacuum during running holds switch 33 open (gas flowing), while vacuum dropping to zero when the engine stops causes switch 33 to shut off, cutting hydrogen gas flow to control valve 53.
Basis
- Confidence
- 0.90
- Published
- 19 Aug 2026
- Component
- electronics
- Source Ref
- US Patents — Hydrogen Gas Injector System For Internal Combustion Engine #4,389,981
- Notebook Id
- 10
- Recorded At
- 2026-07-03T06:23:45.663Z
- Source Page Id
- 44
vacuum-switch shutoff safety