9 results about "Port fuel injection" patented technology

The invention discloses a dual-fuel engine combustion method based on internal and external cooperative injection of a methanol engine, and belongs to the field of methanol fuel engines. The combustion method is realized on the basis of combustion of a diesel / methanol dual-fuel engine with internal and external cooperative injection of a methanol engine, a combustion chamber is formed by a cylinder cover, a cylinder and a piston, an internal and external concentric needle valve oil injector and an in-cylinder direct injection methanol injector are mounted on the cylinder cover, and a methanol port injector is mounted on an intake manifold; the high-reaction-activity diesel oil adopts a double direct injection technology; the low-reactivity methanol fuel adopts an in-cylinder high-low pressure injection and port fuel injection technology, the injection pressure, the injection timing and the injection frequency of the in-cylinder methanol injector are controlled, the gas distribution phase and the valve motion law are adjusted according to the operation condition of the engine, and mixed gas concentration layering of different gradients is formed. The ratio, the injection rule and the injection timing of the diesel oil and the methanol fuel can be flexibly adjusted, and stable operation of multi-mode combustion and high-efficiency clean combustion of the engine is achieved.

A fuel system for delivering liquid fuel to a combustion chamber of an internal combustion engine includes a port fuel injector in an air intake communicating with the combustion chamber, a first fuel rail containing pressurized liquid fuel in communication with the port fuel injector, a direct fuel injector arranged to inject fuel directly into the combustion chamber, second fuel rail containing pressurized liquid fuel in communication with the direct injector, a high-pressure fuel pump having a high-pressure outlet in communication with the second fuel rail, a regulator valve in communication with the high-pressure outlet and the first fuel rail, the regulator valve controllable to reduce a fuel pressure of fuel delivered to the first fuel rail relative to a fuel pressure at said high-pressure outlet; and a control system configured with computer-readable instructions executable to monitor fuel pressure in the first fuel rail, and control the regulator valve to deliver fuel to the first fuel rail to maintain a predetermined quantity of fuel at said predetermined pressure in the first fuel rail.

Provided in the present application are a cold start method and device for an engine, a vehicle and a storage medium. The method is applied to the field of vehicles. The engine comprises a direct injection nozzle and a port fuel injection nozzle. The method comprises: acquiring a current temperature of cooling liquid in the engine of the vehicle; when the current temperature is less than or equal to a preset temperature threshold, acquiring a current rotational speed of the engine, and on the basis of the current temperature of the cooling liquid and the current rotational speed of the engine, determining a first target fuel injection quantity ratio between fuel injection quantities of the direct injection nozzle and the port fuel injection nozzle of the engine during fuel injection; and controlling the direct injection nozzle and the port fuel injection nozzle to perform fuel injection according to the first target fuel injection quantity ratio, so as to control the cold start of the engine. The method can help the engine complete the cold start as soon as possible, thereby improving the success rate of the cold start of the engine.

The present disclosure provides a fuel additive comprising a Mannich detergent additive and a Mannich-based quaternary ammonium salt detergent additive that effectively improves engine performance in both port fuel injection engines and in-cylinder direct injection engines.

The application discloses a starting method and device of a methanol range extender, a vehicle and a computer storage medium. When a starting instruction for the methanol range extender is detected, the vehicle provided with the methanol range extender acquires water temperature data of a vehicle engine; a rotation speed rising slope is determined according to the water temperature data, and the rotation speed of the vehicle engine is controlled to rise at the rotation speed rising slope so as to drag the vehicle engine to rise in rotation speed; when the rotation speed of the vehicle engine rises to a preset minimum rotation speed, the vehicle engine is controlled to spray and ignite fuel to start the methanol range extender. The technical scheme can adapt to the methanol fuel characteristics and the intake port fuel injection characteristics, ensure the normal starting of the methanol range extender, and take into account the fuel consumption, pollutant emission and NVH of the vehicle, thereby effectively improving the starting efficiency of the methanol range extender.

Methods and systems are provided for learning cylinder-to-cylinder air variation. During a condition in which a PFDI engine is operating in port-fuel-injection-only mode, direct-injection fuel rail pressure can be reduced via direct injection prior to port fuel injection. Then, a direct injector can be temporarily opened prior to a spark event in a port-injected cylinder to use a rail pressure sensor to estimate cylinder compression pressure and infer cylinder air charge from it.

Method for an engine (10), comprising: Determining engine operating conditions; Selecting a fuel injection schedule and fuel injection mode for the specific engine operating conditions; Adjusting the airflow into the engine (10) based on the total fuel injection quantity; in response to a report of impairment of a port fuel injection device (262), received during fuel supply to a cylinder (14) via each of a port fuel injection device (262) and a direct fuel injection device (252), limiting an intake air flow.

The present disclosure provides a fuel additive comprising a quaternary ammonium salt additive and a Mannich detergent additive, which effectively improves engine performance in both port fuel injection engines and direct injection engines.

A fuel system for delivering liquid fuel to a combustion chamber of an internal combustion engine includes a port fuel injector in an air intake communicating with the combustion chamber, a first fuel rail containing pressurized liquid fuel in communication with the port fuel injector, a direct fuel injector arranged to inject fuel directly into the combustion chamber, second fuel rail containing pressurized liquid fuel in communication with the direct injector, a high-pressure fuel pump having a high-pressure outlet in communication with the second fuel rail, a regulator valve in communication with the high-pressure outlet and the first fuel rail, the regulator valve controllable to reduce a fuel pressure of fuel delivered to the first fuel rail relative to a fuel pressure at said high-pressure outlet; and a control system configured with computer-readable instructions executable to monitor fuel pressure in the first fuel rail, and control the regulator valve to deliver fuel to the first fuel rail to maintain a predetermined quantity of fuel at said predetermined pressure in the first fuel rail.