Electronic fuel injection control device

• US 20070028898A1
• Filed: 08/02/2006
• Published: 02/08/2007
• Est. Priority Date: 08/05/2005
• Status: Active Grant

• Current Assignee: Keihin Corporation (Hitachi, Ltd.)
• Original Assignee: Keihin Corporation (Hitachi, Ltd.)
• Inventors: Namari, Takashi, Ono, Masato
• Granted Patent: US 7,905,217 B2
• Time in Patent Office: Days
• US Class Current: 123/491
• CPC Class Codes: F02D 41/062 for starting F02D41/061 takes precedence
• CPC Class Codes: F02N 3/04 having foot-actuated levers

Abstract

An electronic fuel injection control device of the present invention has at least a fuel injection device for injecting a fuel devoted to a combustion, and a power source circuit for rectifying and stabilizing an alternating-current voltage generated, based on a rotation of a crank shaft; controls the fuel injection device in an internal combustion engine started by rotating the crank shaft through a manual operation; and further has a power source voltage detection mechanism for detecting a value of a power source voltage supplied to the injection device by the circuit, and an Information processing mechanism for starting an operation when receiving a supply of a direct-current voltage from the circuit, initializing itself, inputting a power source voltage value detected by the detection mechanism, and instructing a first fuel injection for the fuel injection device when the input voltage value attains a predetermined voltage value.

Claims

1. An electronic fuel injection control device that has at least a fuel injection device for injecting a fuel devoted to a combustion, and a power source circuit for rectifying and stabilizing an alternating-current voltage generated, based on a rotation of a crank shaft, and that controls the fuel injection device in an internal combustion engine started by rotating the crank shaft through a manual operation, the control device comprising:

a power source voltage detection mechanism configured to detect a value of a power source voltage supplied to the fuel injection device by the power source circuit; and

an information processing mechanism configured to perform first fuel injection processing of;

starting an operation when receiving a supply of a direct-current voltage from the power source circuit;

initializing itself;

inputting the power source voltage value detected by the power source voltage detection mechanism; and

instructing a first fuel injection for the fuel injection device when the input voltage value attains a predetermined voltage value.

2. The electronic fuel injection control device according to claim 1, the information processing mechanism comprising:

a first fuel injection standard time memory mechanism configured to make a first fuel injection standard time correspond to every value of the power source voltage; and

to memorize the first fuel injection standard time, which the first fuel injection standard time is set in advance with considering a response time till starting a fuel injection, and a fuel pressure of a fuel pump that supplies a fuel to the fuel injection control device when the fuel injection device receives a fuel injection instruction signal, wherein in the first fuel injection processing the information processing mechanism refers to the memory mechanism and derives the first fuel injection standard time, based on the power source voltage value detected by the power source voltage detection mechanism;

performs a compensation computation defined in advance according to an engine temperature input from a temperature sensor that detects a temperature of the internal combustion engine for the derived first fuel injection standard time; and

outputs a signal for instructing a fuel injection to the fuel injection device, making the obtained value by the computation a fuel injection time of the first fuel injection.

3. The electronic fuel injection control device according to claim 1, wherein when performing ignition processing of instructing to perform a first ignition for an igniter of the internal combustion engine, the information processing mechanism performs stroke discrimination processing with respect to the internal combustion engine in advance of the ignition processing;

and wherein when the stroke discrimination processing is enabled, the mechanism performs the ignition processing, and following fuel injection processing according to normal fuel injection processing.

4. The electronic fuel injection control device according to claim 2, wherein when performing ignition processing of instructing to perform a first ignition for an igniter of the internal combustion engine, the information processing mechanism performs stroke discrimination processing with respect to the internal combustion engine in advance of the ignition processing;

and wherein when the stroke discrimination processing is enabled, the mechanism performs the ignition processing, and following fuel injection processing according to normal fuel injection processing.

5. The electronic fuel injection control device according to claim 1, wherein when finishing own initialization, the information processing mechanism outputs an ON signal for instructing ON of a power source of the fuel pump;

when finishing the first fuel injection processing, the mechanism outputs an OFF signal for instructing OFF of the power source of the fuel pump; and

when finishing first ignition processing, the mechanism outputs the ON signal for instructing ON of the power source of the fuel pump.

6. The electronic fuel injection control device according to claim 2, wherein when finishing own initialization, the information processing mechanism outputs an ON signal for instructing ON of a power source of the fuel pump;

when finishing the first fuel injection processing, the mechanism outputs an OFF signal for instructing OFF of the power source of the fuel pump; and

when finishing first ignition processing, the mechanism outputs the ON signal for instructing ON of the power source of the fuel pump.

7. The electronic fuel injection control device according to claim 3, wherein when finishing own initialization, the information processing mechanism outputs an ON signal for instructing ON of a power source of the fuel pump;

when finishing the first fuel injection processing, the mechanism outputs an OFF signal for instructing OFF of the power source of the fuel pump; and

when finishing first ignition processing, the mechanism outputs the ON signal for instructing ON of the power source of the fuel pump.

8. The electronic fuel injection control device according to claim 4, wherein when finishing own initialization, the information processing mechanism outputs an ON signal for instructing ON of a power source of the fuel pump;

when finishing the first fuel injection processing, the mechanism outputs an OFF signal for instructing OFF of the power source of the fuel pump; and

when finishing first ignition processing, the mechanism outputs the ON signal for instructing ON of the power source of the fuel pump.