Fuel oil composite injection mechanism for automobile petrol engine as well as mode thereof

Abstract

The invention relates to a vehicle gasoline engine fuel compound injection mechanism and a way thereof. The compound injection mechanism comprises a combustion chamber, an inlet channel and an inlet manifold, wherein, the lower part of the inlet channel is provided with a high pressure fuel oil injector, manifold branch of each cylinder of the inlet manifold is provided with a low pressure fuel oil injector, both the high pressure fuel oil injector and the low pressure fuel oil injector are controlled by an ECU. The compound injection way comprises the following steps that: 1. when the working condition is started, the high pressure fuel oil injector does not work, the low pressure fuel oil injector performs the injection inside the inlet manifold; 2. when an accelerant warms up, both the high pressure fuel oil injector and the low pressure fuel oil injector work; 3. under the circumstance of partial load, the low pressure fuel oil injector injects a small amount of fuel oil to form thin and even gas mixture which enters a combustion chamber; under the circumstance of the compression travel, the high pressure fuel oil injector injects and thick gas mixture is formed near a spark plug to realize the lay separation of the gas mixture inside the cylinder; 4. under the circumstance of high speed full load, the high pressure fuel oil injector works and the low pressure fuel oil injector does not work. The vehicle gasoline engine fuel compound injection mechanism and the way thereof realize the compound injection of the combination of the intra-cylinder injection and the extra-cylinder injection, improve the gasoline burning situation and decrease the exhaust of the unburned hydrocarbon.

Description

technical field [0001] The invention belongs to the field of automobile manufacturing, and in particular relates to a fuel compound injection mechanism for a gasoline engine for a vehicle and its method. Background technique [0002] Compared with traditional port injection engines, current in-cylinder direct injection engines can reduce fuel consumption at partial loads and improve torque and power at high loads. The technical economy of direct injection in cylinder is mainly to stratify the mixture in cylinder and realize lean combustion. However, this technology has extremely strict requirements on the design of the engine cylinder head air passage and combustion chamber, and also requires complex and precise engine control strategies. It is manifested in the fact that the fuel injector does not inject fuel until the compression stroke at partial load, and a rich mixture is easily formed near the spark plug. In the area, unburned hydrocarbons (HC) will be emitted and to...

AI Technical Summary

Problems solved by technology

When an in-cylinder direct-injection gasoline engine is started, the pressure increase in the fuel rail lags behind, so the injector injects fuel at a lower pressure, and the spray atomization and port injection ratio deteriorates, and as a result, HC emissions deteriorate

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