Input sensor circuit for a digital engine controller
US4060714A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 1976 |
| Grant date | Nov 29, 1977 |
| Priority date | — |
| Expiry date | May 20, 1996 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/28
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In one embodiment, a circuit parameter of a sensor varies in accordance with an input useful in controlling an event associated with operation of an engine, for example, spark timing. The sensor is connected in an input sensing circuit characterized by a first order differential equation exhibiting an exponential transient whose time constant is representative of the circuit parameter, and hence of the input being sensed. A step function input is applied to the sensing circuit to cause the occurrence of an exponential transient, and concurrently a digital counter circuit begins counting clock pulses. The transient is compared against a predetermined reference, and when a predetermined relationship between the reference and the transient is attained, the counter circuit ceases counting pulses. The accumulated count is in the form of a binary word which may be used directly by a digital microprocessor in calculations for controlling the event.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.