# US 5,345,919 A · Fuel injection apparatus for an internal combustion engine

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- Number: US 5,345,919 A
- Document ID: US5345919A
- Status: Granted
- Kind: A
- Application number: 08/103,234
- Filed: 1993-08-06
- Granted: 1994-09-13
- Earliest claimed: 1992-08-11
- Assignees: Mitsubishi Denki Kabushiki Kaisha
- Inventors: Masanobu Uchinami
- Web page: https://patentgrep.com/patent/US5345919A

## CPC

- F02M 35/10163: {having air intakes specially adapted to selectively deliver naturally aspirated fluid or supercharged fluid}
- F02M 35/10216: {Fuel injectors; Fuel pipes or rails; Fuel pumps or pressure regulators}
- F02M 35/10386: {for flow rate (air flow meters in air cleaners F02M35/021; circuit arrangements for generating control signals by measuring intake air flow F02D41/18)}
- F02M 35/108: with primary and secondary intake passages
- Y02T 10/12: Improving ICE efficiencies
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A fuel injection apparatus has an injector 4 for supplying fuel to an internal combustion engine 1, an air passage 35 having one end connected to the injector for atomizing the fuel injected therefrom and the other end connected to an air source, an air control valve 30 disposed in the air passage for controlling the quantity of air flowing therethrough, and a control unit 37 connected to the air control valve for controlling it in accordance with operating conditions of the engine. A pressure pump 40 may also be connected in the air passage for pressurizing the air therein, together with a pressure adjuster 42 disposed in a by-pass pipe 44 for controlling the pressure within the air passage, and a check valve 46 for preventing any pressurized air back flow.

## Claims

### Claim 1

A fuel injection apparatus for an internal combustion engine comprising:
a fuel injector for supplying a fuel to the internal combustion engine;
an air passage having one end connected to said fuel injector for atomizing the fuel injected from said fuel injector and the other end connected to an air source;
an air controlling valve disposed in said air passage for controlling a quantity of air flowing therethrough;
a control unit connected to said air controlling valve for controlling said air controlling valve in accordance with an operating condition of the internal combustion engine;
a pressure pump connected to said air passage for pressurizing the air within said air passage; and
a check valve disposed on an up-stream side of said pressure pump of said air passage for preventing the pressurized air supplied by said pressure pump from flowing backward.

### Claim 2 (depends on 1)

A fuel injection apparatus as claimed in claim 1, wherein said air controlling valve comprises a solenoid valve.

### Claim 3 (depends on 1)

A fuel injection apparatus as claimed in claim 1, wherein said pressure pump comprises pressure adjusting means for controlling an air pressure within said air passage.

### Claim 4 (depends on 3)

A fuel injection apparatus as claimed in claim 3, wherein said air passage has a by-pass pipe connected to said air passage across said pressure pump and said pressure adjusting means is disposed in said by-pass pipe.