Supplementary fuel injection system for a turbocharged internal combustion engine

Claim 1

An improved multifuel turbocharger system for an engine of the type having an intake manifold for receipt of diesel fuel and air, said system comprising, in combination: a turbocharger having an inlet for air, a compressor for compressing said air and an outlet to the diesel engine intake manifold; an exhaust line from the engine connected to the turbocharger for driving the turbocharger; an enclosed auxiliary fuel tank containing an auxiliary fuel mixture of alcohol and water; a fluid pressure line connecting the turbocharger outlet to the auxiliary fuel tank for pressurizing the tank at the same pressure as the turbocharger outlet pressure; an auxiliary fuel tank outlet line from the auxiliary fuel tank to the intake manifold; and pressure control means solely in the auxiliary fuel tank outlet line including means to prevent flow of the auxiliary fuel mixture to the intake manifold below a threshold pressure, and for operating the engine solely on diesel fuel and air combustion at low engine load; said pressure control means also including means for operating the engine on diesel fuel, air and a proportionally increasing auxiliary fuel mixture at increasing engine loads above said threshold pressure including restrictor means sized to permit auxiliary fuel flow directly proportionally responsive to the pressure of said turbocharger outlet to the auxiliary fuel tank to provide increased auxiliary fuel flow directly and proportionally in response to increased engine load above the threshold pressure level, air inlet means to the auxiliary fuel tank outlet line downstream from the restrictor means and a mechanical, auxiliary fuel and air pump downstream from the restrictor means for pumping the auxiliary fuel and air mixture into the intake manifold.