# US 12,000,350 B1 · Controller for hydrogen engine

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,000,350 B1
- Document ID: US12000350B1
- Status: Granted
- Kind: B1
- Application number: 18/492,764
- Filed: 2023-10-23
- Published: 2024-06-20
- Granted: 2024-06-04
- Earliest claimed: 2022-12-20
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Atsushi Tabata; Koichi Okuda; Nobuhiko Satake; Daiki Sato
- Web page: https://patentgrep.com/patent/US12000350B1

## CPC

- F02D 41/042: {for stopping the engine}
- F02D 13/0261: {Controlling the valve overlap}
- F02D 19/021: {Control of components of the fuel supply system}
- F02D 41/0007: {for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12)}
- F02D 41/0027: {the fuel being gaseous (non-electrical control F02D19/02)}
- F02D 2041/1472: {the characteristics being a humidity or water content of the exhaust gases}
- Y02T 10/30: Use of alternative fuels, e.g. biofuels
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A controller for a hydrogen engine is provided. Control circuitry performs, after a stop request for the hydrogen engine, a water reduction process that reduces a proportion of water vapor in exhaust gas. The control circuitry stops the hydrogen engine after operating the hydrogen engine with the water reduction process executed.

## Claims

### Claim 1

A controller for a hydrogen engine, the controller comprising control circuitry configured to:
perform, after a stop request for the hydrogen engine, a water reduction process that reduces a proportion of water vapor in exhaust gas; and
stop the hydrogen engine after operating the hydrogen engine with the water reduction process executed, wherein
the hydrogen engine includes a forced induction device, and
the water reduction process sets a valve overlap amount of an intake valve and an exhaust valve of the hydrogen engine to be higher than the valve overlap amount obtained before the stop request.

### Claim 2 (depends on 1)

The controller according to claim 1, wherein the water reduction process changes an air-fuel ratio of air-fuel mixture to be burned to a leaner value than the air-fuel ratio obtained before the stop request.

### Claim 3 (depends on 1)

The controller according to claim 1, wherein the control circuitry is configured to change a degree of decrease in the proportion of the water vapor in the water reduction process depending on a stop situation of the hydrogen engine.

### Claim 4 (depends on 1)

The controller according to claim 1, wherein the control circuitry is configured to change, depending on a stop situation of the hydrogen engine, a period during which the hydrogen engine is operated with the water reduction process executed.