US 4,967,712 AGranted

Two-cycle engine with electronic fuel injection

AssigneeInjection Research Specialists, Inc.

InventorRonald E. Chasteen

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Abstract

A fuel injection system for a two-stroke cycle engine comprising an air manifold; a throttle valve; a fuel injector; a fuel supply system including a fuel pump; a battery voltage sensor; an air temperature sensor; an engine speed sensor; a timing sensor; a barometric pressure sensor; a throttle position sensor; a first data processor for receiving and processing sensing signals for determining fuel injector duration and timing and fuel pump operating speed; a first data processor temperature sensor for sensing the relative temperature of certain electronic components in the first data processor; a heater operatively associated with the first data processor electronic components for selectivley heating the electronic components; and a second data processor operable independently of the first data processor for receiving an electronic component temperature sensing signal and for generating a control signal to the heate responsive thereto for heating the components when the temperature thereof is below a predetermined minimum value.

A control system for controlling the operation of a two-cycle engine designed to be operated in a predetermined operating air temperature range, comprising:

(a) at least one performance variable sensing means for sensing the present state of a preselected variable associated with engine performance and for generating a performance variable sensing signal indicative of said present state of said preselected performance variable;
(b) a first data processing means for receiving and processing said performance variable sensing signal and for generating a control signal based upon the processing of said sensing signal for controlling at least one operating parameter of said engine;
said data processing means comprising at least one temperature-sensitive electronic circuit component which is subject to malfunction below a predetermined malfunction temperature which is within said predetermined operating temperature range of said engine;
(c) component environment temperature sensing means for sensing the temperature within the immediate operating environment of said temperature-sensitive electronic circuit component and for generating a temperature signal representative of the sensed temperature;
(d) a second data processing means which operates independently of said first data processing means and which is not subject to temperature-related malfunction within said predetermined operating temperature range for processing said signal from said component environment temperature sensing means and generating a heating control signal responsive thereto when the temperature in said electronic circuit immediate operating environment is sensed to be below said predetermined malfunction temperature;
(e) heating means responsive to said heating control signal for heating only said temperature sensitive electronic component immediate operating environment in response to said control signal;
(f) power supply means for providing electric energy for operating said control system;
and
(g) switch means for selectively operably electrically connecting or disconnecting said energy supply means and electrically operated components of said control system.

6 more elements

Facts

Application

07/446,218Filed 4 Dec 1989 · continuation

Priority

12 Nov 1987

Granted

6 Nov 1990

Term ends

Not estimatedThe source records don’t support an estimate.

Classification22 codes

F02D 41/00
Electrical control of supply of combustible mixture or its constituents
F02D 37/02
Non-electrical conjoint control of two or more functions of engines, not otherwise provided for: one of the functions being ignition
F02D 41/068
For engine starting or warming up: for warming-up
F02D 41/26
Characterised by the use of digital means: using computer, e.g. microprocessor

Abstract

Claims3