Electronic vacuum modulator for controlling air flow to a throttle modulator mechanism for limiting engine speed and vehicle speed
US4086888A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 27, 1976 |
| Grant date | May 2, 1978 |
| Priority date | — |
| Expiry date | Feb 27, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60K31/10
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An electronic vacuum modulator is disclosed for controlling air flow to a throttle valve modulator mechanism for limiting the maximum speed of an engine and, optionally, for also limiting the maximum vehicle speed. An electric signal having a frequency proportional to engine speed is converted into an electric signal which smoothly and progressively controls a solenoid valve as the engine speed increases over a narrow range at a predetermined maximum engine speed. The valve is controlled such that the modulator mechanism progressively closes a carburetor throttle valve in the engine to limit the engine speed by limiting the available power. Optionally, a vehicle speed signal also is converted into an electronic signal which smoothly and progressively controls the solenoid valve as the vehicle speed increases over a narrow range at a predetermined maximum vehicle speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.