Ignition-control system for internal-combustion engine
US4020807A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1974 |
| Grant date | May 3, 1977 |
| Priority date | — |
| Expiry date | Jan 16, 1994 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P5/1556
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In order to vary the timing of the ignition of an air/fuel mixture in a cylinder of an internal-combustion engine as a function of engine speed, a flip-flop is set by an engine-controlled switch at a predetermined point t.sub.0 in the cycle, in a position preceding by an angle .alpha..sub.0 the upper-dead-center position of an associated piston, to effect a rapid discharge and to start a slow recharge, at constant rate, of a capacitor C.sub.1 forming part of a time/voltage converter. The maximum voltage attained by this capacitor at the end of a cycle, as a measure of cycle length T, is registered in an ancillary capacitor C.sub.3 as another capacitor C.sub.2, forming part of a voltage/time converter, also begins charging at time t.sub.0 at a rate making the charges of capacitors C.sub.2 and C.sub.3 equal on or before the attainment of the UDC position. This equality is detected by a comparator which thereupon, at a time t.sub.0 +t.sub..gamma., resets the flip-flop to trigger an igniter for the associated cylinder. The charging rate of capacitor C.sub.2 may be modified by one or more sensing circuits responsive to external parameters and/or by one or more threshold circuits upon th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.