Two-stroke engines
US4966104A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 26, 1989 |
| Grant date | Oct 30, 1990 |
| Priority date | — |
| Expiry date | Jun 26, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A two-stroke engine comprises a cylinder which accommodates a piston and which has inlet and outlet ports, means for injecting fuel into the cylinder and control means for controlling the amount of fuel injected. The engine also includes a vent passage communicating with the interior of the cylinder and a first valve which is arranged to prevent communication between the interior of the cylinder and the vent passage and is connected to be opened and closed in synchronism with movement of the piston. Situated in the vent passage downstream of the first valve is a second throttling valve which is coupled to the control means and is arranged to be opened to an increasing extent to permit an increasing proportion of the inlet charge to be discharged as the control means is operated to reduce the amount of fuel which is injected into the cylinder thereby achieving homogeneous combustion at a constant air fuel ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.