Electronic accelerator pump timing control
US4251848A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1979 |
| Grant date | Feb 17, 1981 |
| Priority date | — |
| Expiry date | Jan 24, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2300/022
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Disclosed herein is an electronic timing circuit which can be incorporated in an accelerator pump timing control, also disclosed herein. The timing circuit is adapted to be connected to the first and second power terminals of a DC supply and for energizing a load, for example, a fuel pump solenoid valve, during a predetermined timed cycle. The circuit includes a thyristor having an anode-cathode path adapted to be connected to the load so that when the thyristor is rendered conductive by a trigger pulse applied to the gate, current flows from the DC supply through the thyristor to energize the load and start the timed cycle. A transistor control circuit including a transistor connected in series relation with the anode-cathode path is operable for controlling the energizing current flow through the thyristor, subject to a relaxation oscillator included in the timing circuit. The relaxation oscillator produces a stop pulse a predetermined time after the start of the timed cycle for rendering the transistor operative to interrupt the energizing current flow through the thyristor and to thereby deenergize the load and end the timed cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.