초록 ▼

Carbon deposits and related residue are removed from he internal surfaces of components of an internal combustion engine, particularly the fuel ports of a carbureted engine and the injection nozzles of a fuel injection engine, by circulating an engine conditioning fuel, through the engine utilizing

Carbon deposits and related residue are removed from he internal surfaces of components of an internal combustion engine, particularly the fuel ports of a carbureted engine and the injection nozzles of a fuel injection engine, by circulating an engine conditioning fuel, through the engine utilizing a conditioning fuel pump, preferably driven by a fluid driven motor, for pumping conditioning fuel to the engine. The conditioning apparatus can detect leakage of the fuel pressure regulator of a fuel injected engine and can operate in both a one-line mode in which conditioning fuel flows one way from the apparatus to the engine and a two-line mode wherein the conditioning fuel is recirculated through the engine and conditioning apparatus. A preferred embodiment provides diagnostic features for checking the conditioning apparatus and certain engine components. These include a by-pass conduit between a flowmeter input side and an engine pressure regulator, check valve means to test opening pressure of the pressure regulator, a pressure control valve to restrict flow to reduce pressure below a set pressure regulator opening pressure to indicate leakage, a shut-off valve closable to provide indication of static system pressure produced by the engine fuel pump, and openable to provide indication of flow rate produced by the fuel pump.

대표청구항 ▼

[ We claim:] [8.] A method of operating a fuel injected internal combustion engine having fuel injectors, a fuel infeedl line for conducting fuel to said injectors, a fuel return line for conducting unused fuel from said injectors, and a fuel pressure regulator in said return line having a certain r

[ We claim:] [8.] A method of operating a fuel injected internal combustion engine having fuel injectors, a fuel infeedl line for conducting fuel to said injectors, a fuel return line for conducting unused fuel from said injectors, and a fuel pressure regulator in said return line having a certain rated cracking pressure at which the regulator is designed to crack open, comprising the steps of:(a) supplying fuel to said fuel infeed line at a pressure just slightly less than said rated cracking pressure, whereby the fuel flow to said fuel infeed means is injected into the engine through said fuel injectors, and(b) measuring fuel flow to said fuel infeed line with a flow metering means which normally indicates a certain flow rate under the condition set forth in step (a) above, whereby a flow rate indication different from said certain flow rate under the conditions of step (a) indicates leakage of the pressure regulator, and cracking open of the pressure regulator may be determined by gradually increasing the fuel pressure to the engine and noting the change in the flow rate indication of the flow metering means in response to cracking of the regulator.