US 6,805,104 B2 · System and method for feeding LPG by injection for an internal combustion engine

Abstract

In a system for feeding LPG by injection for an internal combustion engine, sensor means are provided for measuring the electrical current absorbed by the electric motor for driving the feed pump. The operation of said electric motor is interrupted when the measured electrical current absorbed drops below a predetermined threshold value. The system thereby prevents the operation of the motor-pump assembly, which is immersed in the LPG within the LPG tank, when the level of LPG in the tank drops below a minimum admissible value. Simultaneously to the interruption of the operation of the electric motor an auxiliary petrol feed system is activated.

Claims5

Dependent claims

A system for feeding LPG by injection for an internal combustion engine, comprising:

an LPG tank,
a plurality of LPG injectors associated to the cylinders of the engine, to inject LPG in the liquid state into said cylinders,
a manifold or rail for feeding the LPG to said injectors,
a conduit for feeding LPG from the tank to the aforesaid rail,
a return conduit to return into the tank the excess LPG fed to the injectors,
a pump immersed in the LPG present in the tank to feed the LPG through the LPG feed conduit, and
an electric motor for driving the pump,
wherein it further comprises:
sensor means for measuring the electric current absorbed by the electric motor for driving the pump, and
actuator means for interrupting the operation of the electric motor when the sensor means detect a lowering of the electrical current absorbed by the electric motor below a predetermined threshold value.

7 more elements

Dependencies are inferred from the claim text.

System and method for feeding LPG by injection for an internal combustion engine

Life of this patent

System and method for feeding LPG by injection for an internal combustion engine

Life of this patent

Abstract

Claims5