Patent ID: 6845759
Filing Date: 2005-01-25
Classification: F02M

Abstract:
1. A liquid fuel injection system comprising: an injection device including a liquid discharge nozzle having one end exposed to an intake path of an internal combustion engine, the intake path being equipped with an intake valve, a piezoelectric/electrostrictive element operated by means of a drive voltage signal, a chamber whose volume changes with operation of said piezoelectric/electrostrictive element and to which the other end of said liquid discharge nozzle is connected, a liquid feed path connected to said chamber, and a liquid inlet for establishing communication between said liquid feed path and an exterior of said injection device; a drive voltage generation device for supplying said drive voltage signal to said piezoelectric/electrostrictive element; a pressurizing unit for pressurizing liquid fuel; a discharge valve including a liquid path, to which liquid fuel pressurized by means of said pressurizing unit is fed, and a solenoid-operated valve for opening and closing said liquid path in response to a valve-opening drive signal, said solenoid-operated valve being opened in response to receipt of said valve-opening drive signal in order to discharge liquid fuel, fed from said pressurizing unit, into said liquid inlet of said injection device via said liquid path; and a valve-opening drive signal generation device for supplying said valve-opening drive signal to said solenoid-operated valve; liquid fuel, discharged from said discharge valve and injected into said intake path from said liquid discharge nozzle, being atomized by means of variation in volume of said chamber; wherein said valve-opening drive signal generation device issues said valve-opening drive signal only during a period of time when said intake valve is closed.