Method and apparatus for the removal of deposits from a fuel injection valve

Claim 3

Apparatus for the removal of deposits from a fuel injection valve of the type containing a reciprocatory sprayer needle unit and a solenoid for operating said sprayer needle unit, said sprayer needle unit including a valve member, said apparatus comprising a container, a pool of detergent in said container, supporting means arranged to maintain a plurality of injection valves in a vertical position in which at least their front portions are immersed in said pool, at least one ultrasonic vibrator arranged to submit said pool to ultrasonic vibrations, means for energizing said ultrasonic vibrator, means for generating electric pulses having a frequency in the range from 25 to 100 pulses per second, circuit means for transmitting said pulses to each of the solenoids of said injection valves, and means for causing a current of the detergent to flow through each of said injection valves.

Claim 4

Apparatus for the removal of deposits from a fuel injection valve of the type containing a reciprocatory sprayer needle unit and a solenoid for operating said sprayer needle unit, said sprayer needle unit including a valve member, said apparatus comprising a container, a pool of detergent in said container, supporting means arranged to maintain a plurality of injection valves in a vertical position in which at least their front portions are immersed in said pool, at least one ultrasonic vibrator arranged to submit said pool to ultrasonic vibrations, means for energizing said ultrasonic vibrator, means for generating electric pulses having a frequency in the range from 25 to 100 pulses per second, circuit means for transmitting said pulses to each of the solenoids of said injection valves, and means for causing a current of the detergent to flow through each of said injection valves.

Claim 5

Apparatus as claimed in claim 2, which comprises a second container mechanically connected to said container by supporting means arranged to maintain the bottom of said second container above the upper rim of said container, a plurality of outlets provided at the bottom of said second container, and flexible conduits for connecting each of said outlets to one of said injection valves.

Claim 6

Apparatus as claimed in claim 2, which includes a time switch arranged to stop the energizing of said ultrasonic vibrator at the end of a predetermined period.

Claim 7

Apparatus as claimed in claim 2, which includes a time switch arranged to stop the supply of electric pulses to the solenoids at the end of a predetermined period.

Claim 8

Apparatus as claimed in claim 2, which comprises a housing enclosing the means for energizing the ultrasonic vibrator as well as the means for producing electric pulses, said container constituting part of the wall of said housing, an injection valve holder mounted on said housing, a length indicator mounted on said housing, said length indicator having a sensing tip arranged to engage the tip of the sprayer needle of an injector valve held in said valve holder, direct electric current generating means contained within said housing, and circuit means for connecting said direct current generating means to the solenoid of the injector valve held in said valve holder, said circuit means including a normally opened contact, and a push button fitted on said housing and arranged to operate said normally opened contact.