FUEL AND WATER INJECTION SYSTEM AND METHOD FOR CONTROLLING THE SAME
First Claim
1. A fuel and water injection system, the system comprising:
- an injector having a needle which is movable upwardly and downwardly by a solenoid coil, a nozzle orifice which is opened and closed by upward and downward movements of the needle, and a pressure chamber communicating with the nozzle orifice;
a fuel pump supplying a fuel to the pressure chamber of the injector;
a water pump supplying water to the pressure chamber of the injector;
a solenoid shut-off valve disposed on a water supply pipe connecting the water pump and the pressure chamber of the injector;
an engine control unit (ECU) configured to control the fuel pump and the injector; and
a water supply controller configured to control the water pump and the solenoid shut-off valve,wherein the water supply controller is configured to selectively open and close the solenoid shut-off valve based on operating conditions of an engine, so that the fuel and water injection system selectively operates in a fuel injection mode in which the injector injects only the fuel, or in a fuel and water injection mode in which the injector injects the fuel and the water together.
1 Assignment
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Accused Products
Abstract
A fuel and water injection system includes: an injector having a needle which is movable upwardly and downwardly by a solenoid coil, a nozzle orifice which is opened and closed by upward and downward movements of the needle, and a pressure chamber communicating with the nozzle orifice; a fuel pump supplying fuel to the pressure chamber; a water pump supplying water to the pressure chamber; a solenoid shut-off valve disposed on a water supply pipe connecting the water pump and the injector; an engine control unit (ECU) controlling the fuel pump and the injector; and a water supply controller controlling the water pump and the solenoid shut-off valve.
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Citations
12 Claims
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1. A fuel and water injection system, the system comprising:
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an injector having a needle which is movable upwardly and downwardly by a solenoid coil, a nozzle orifice which is opened and closed by upward and downward movements of the needle, and a pressure chamber communicating with the nozzle orifice; a fuel pump supplying a fuel to the pressure chamber of the injector; a water pump supplying water to the pressure chamber of the injector; a solenoid shut-off valve disposed on a water supply pipe connecting the water pump and the pressure chamber of the injector; an engine control unit (ECU) configured to control the fuel pump and the injector; and a water supply controller configured to control the water pump and the solenoid shut-off valve, wherein the water supply controller is configured to selectively open and close the solenoid shut-off valve based on operating conditions of an engine, so that the fuel and water injection system selectively operates in a fuel injection mode in which the injector injects only the fuel, or in a fuel and water injection mode in which the injector injects the fuel and the water together. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling a fuel and water injection system, where the fuel and water injection system comprises an injector having a needle which is movable upwardly and downwardly by a solenoid coil, a nozzle orifice which is opened and closed by upward and downward movements of the needle, and a pressure chamber communicating with the nozzle orifice;
- a fuel pump supplying a fuel to the pressure chamber of the injector;
a water pump supplying water to the pressure chamber of the injector;
a solenoid shut-off valve disposed on a water supply pipe connecting the water pump and the injector;
an engine control unit (ECU) controlling the fuel pump and the injector; and
a water supply controller controlling the water pump and the solenoid shut-off valve, the method comprising;driving the solenoid coil of the injector based on a first duty cycle, and turning on the water pump and driving the solenoid shut-off valve based on a second duty cycle when an engine speed is lower than or equal to a first predetermined speed or an engine load is lower than or equal to a first predetermined load, thereby allowing the fuel and water injection system to operate in a fuel and water injection mode in which the injector injects the fuel and the water together; and driving the solenoid coil of the injector based on the first duty cycle, and turning off the water pump and closing the solenoid shut-off valve when the engine speed exceeds the first predetermined speed or the engine load exceeds the first predetermined load, thereby allowing the fuel and water injection system to operate in a fuel injection mode in which the injector injects only the fuel. - View Dependent Claims (10, 11, 12)
- a fuel pump supplying a fuel to the pressure chamber of the injector;
Specification