A method for reducing torque by disconnecting a cylinder of a gasoline engine

Abstract

The invention relates to a method for shutting off cylinders and reducing torsion of gasoline engines. The method is applied to gasoline engines with three or more cylinders. The method is characterized by adding mixed gas self-adaption control function through special control software for mixed gas self-adaption on the basis of general gasoline direct injection engine air-fuel ratio closed-loop function; two engine operation cycles are used as a cylinder shutoff control period for sending gasoline injection commands of gasoline injectors; through combination of adjustment of ignition angles,the more accurate torsion reduction requirement can be achieved. The method specifically comprises eight steps. The method has the beneficial effects that the functions of calculating torsion reduction efficiency, coordinating torsion reduction, making cylinder shutoff strategy, executing cylinder shutoff and correcting ignition are added into ECU control strategy under the premise of not adding engine mechanical structures and electronic device hardware cost; finally, the engine torsion reduction accuracy is more than doubled; the engine torsion reduction effect of the vehicle during shiftinggears is effectively improved; the gear shifting smoothness of the vehicle is improved.

Description

technical field [0001] The invention belongs to the field of automobile electronic control. The invention relates to a gasoline engine cylinder disconnection torque reduction method, which is suitable for gasoline engines and vehicles with three or more cylinders and equipped with electronically controlled fuel injectors, spark plugs and an engine control unit ECU (Engine Control Unit). Background technique [0002] For cars with conventional transmission mechanisms such as manual transmissions, stepped automatic transmissions, etc., during the entire driving process, the system will require the output torque of the engine to drop rapidly, for example, when the vehicle is raised from a low gear to a high gear , in order to ensure the smoothness of the shifting process, the engine needs to be able to achieve rapid torque reduction and cylinder breakage. [0003] In the prior art prior to the present invention, the patent document (CN103470324A) discloses a cylinder breaking ...

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Problems solved by technology

[0004] For the system disclosed in the patent document (CN103470324A), it finally realizes the function of cutting off the cylinder by changing the mechanical structure of the engine valve parts. This method needs to be reprocessed on the existing engine, and the realization cost is relatively high; , focusing on the torque coordination problem between different power sources and power demands in the hybrid power system, which cannot be applied to the conventional gasoline engine's demand for torque reduction and broken cylinders; performance benefits, but there is no ideal solution for the fast response requirement of torque reduction

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