Fuel pumping control method and system and vehicle

Abstract

The invention provides a fuel pumping control method and system and a vehicle. The fuel pumping control method comprises the steps that whether the flow of a fuel pump needs to be controlled or not is determined according to the current working condition of an engine, and when it is determined that the flow of the fuel pump needs to be controlled, the flow of the fuel pump is controlled according to the following method that a fuel pressure value at a fuel oil rail is obtained, and whether the fuel pressure value is within a preset pressure range value or not is judged; when it is determined that the fuel pressure value is within the preset pressure value range, the fuel pump is controlled to pump out fuel according to the rated supply flow e; and when it is determined that the fuel pressure value is not within the preset pressure value range, the current fuel flow coefficient r is obtained through real-time calculation, the fuel pump is controlled to pump out fuel according to the target supply flow p, and the target supply flow p is obtained through calculation according to the following formula: p = e +/-r. According to the scheme, the supply flow of the fuel can be controlled according to different working conditions of the engine, the situation that the methanol pressure in the fuel rail is reduced due to the fact that the fuel injection pulse width is increased can be avoided, and the fuel pump can be autonomously diagnosed.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a fuel pumping control method, system and vehicle. Background technique [0002] The methanol engine uses M100 methanol as fuel, which has the advantages of good emission and good economy. The methanol engine uses an electronically controlled fuel injection system, which needs to provide a certain pressure of fuel to the electronically controlled fuel system. The demand for fuel supply flow is inconsistent under different working conditions of the engine, such as starting condition, idling condition, partial load and full load condition, and acceleration condition. When the flow rate is constant, when the engine is under high load and high speed, the fuel injection pulse The widening will lead to the reduction of fuel injection pressure, which will affect the actual fuel injection quantity and cause insufficient combustion of the engine. [0003] In addition, the electric fuel...

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Problems solved by technology

[0004] An object of the present application is to solve the problem that the fuel pump cannot be accurately controlled according to the engine operating conditions in the prior art, and at the same time solve the problem that the methanol pressure in the oil rail decreases due to the increase in the fuel injection pulse width in the prior art, thereby A technical problem that affects the actual fuel injection volume and causes insufficient combustion of the engine

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