Control method and equipment for oil injection quantity in case of sudden increase of torque of engine

Abstract

The invention provides a control method and equipment for oil injection quantity in case of sudden increase of torque of an engine. When the torque of the engine is suddenly increased, the torque change rate is judged to be greater than a change rate calibration value; and when a torque demand value is judged to be greater than a torque threshold value, a new oil quantity limit value control curve is started to control the oil injection quantity. Therefore, when the torque of the engine is suddenly increased, larger oil injection quantity is provided for the engine, flame-out of the engine is avoided, and normal work of the engine is guaranteed. The original oil quantity limit value control chart is three-dimensional, the rotation speed and the torque are input, and the oil injection quantity is output. The rotation speed is in one-to-one correspondence relation with the maximum oil injection quantity. The oil injection quantity in case of sudden increase of the torque is limited by the maximum oil injection quantity corresponding to the rotation speed. In the new oil quantity limit value control curve provided by the invention, the maximum oil injection quantity limit value corresponding to the rotation speed is greater than the maximum oil injection quantity limit value corresponding to the same rotation speed in the original oil quantity limit value control chart. When the torque is suddenly increased, the requirement of the engine on the oil injection quantity is met, and no flame-out of the engine is guaranteed.

Description

technical field [0001] The invention relates to the technical field of engine control, in particular to a method and device for controlling the fuel injection amount when the engine torque increases suddenly. Background technique [0002] In the prior art, in the National III and National IV electronically controlled engines, the fuel injection quantity of the engine is only calculated according to the engine speed and torque, and the maximum fuel injection quantity limit is set by the speed. That is, the existing fuel quantity limit control map is three-dimensional, including three quantities of rotational speed, torque, and fuel injection quantity, as well as a one-to-one correspondence between rotational speed and the maximum limit of fuel injection quantity. [0003] However, during the actual operation of the vehicle, a sudden increase in torque may occur. For example, a sudden overtaking of a driver, or a sudden increase in the load of a construction machinery vehicle...

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Problems solved by technology

[0004] In the prior art, there is no control method that ca

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