Patent ID: 6640786
Filing Date: 2003-11-04
Classification: F02D,F02M

Abstract:
A micro-pulsation metering fuel injection system, comprising:a throttle body, mounted in an inlet pipe of a cylinder of an internal combustion engine for controlling a quantity of flow of air into a combustion chamber; at least one pipe for supplying fuel; at least one injection unit, mounted on said throttle body, connected with said at least one pipe and having a plurality of micropumps which inject tiny droplets of fuel that are delivered by said at least one pipe into an air inlet inside said throttle body at an intermittently variable rate determined by an operating condition of said internal combustion engine, so that said droplets of fuel mix with air in said trottle body, creating a mixture which enters said combustion chamber of said cylinder; wherein injection of said fuel by said plurality of micropumps is controlled by a control unit in response to said operating condition of said internal combustion engine, said control unit performing calculations and issuing an intermittent control signal synchronized with said internal combustion engine, with said plurality of micropumps operating at a fixed frequency during an active phase of said intermittent control signal, and said plurality of micropumps not operating when no signal is received from said control unit.