Variable control method for one-stage variable oil pump of engine and one-stage variable oil pump of engine

Abstract

The invention discloses a variable control method for a one-stage variable oil pump of an engine and the one-stage variable oil pump of the engine. The method comprises the following steps that: 1, when rotation speed of the engine is in a range of between 0 and the engine rotation speed corresponding to adjustment starting variable of a two-stage displacement pump, the flow of the one-stage variable oil pump is proportional to the rotation speed of the engine; 2, when the rotation speed of the engine is in a range of between the engine rotation speed corresponding to adjustment starting variable of the two-stage displacement pump and the engine rotation speed corresponding to the minimum output displacement of the one-stage variable oil pump, the flow of the one-stage variable oil pump is kept unchanged; and 3, when the rotation speed of the engine is in a range of between the engine rotation speed corresponding to the minimum output displacement of the one-stage variable oil pump and the maximum rotation speed of the engine, the flow of the one-stage variable oil pump is proportional to the rotation speed of the engine. The comprehensive effect of the control method is obviously superior to that of the control method of the one-stage variable oil pump and that of the control method of a two-stage variable oil pump, so the equipment investment cost and the equipment operation cost are saved.

Description

technical field [0001] The invention belongs to the automobile engine lubricating oil system technology, and in particular relates to a variable control technology of an engine primary variable oil pump. Background technique [0002] Variable displacement oil pumps have been widely used in engine lubricating oil systems for lubricating oil supply. At present, there are two forms of primary variable oil pump and secondary variable oil pump widely used in the engine lubricating oil system. [0003] For the control method of the existing primary variable oil pump and the control method of the secondary variable oil pump, such as figure 2 As shown, line 1 is the control method curve for the first-stage variable displacement oil pump: it is divided into two steps: Step 1 is: when the engine speed n is from zero to the engine speed N2 corresponding to the adjustment volume of the first-stage variable displacement pump, the first-stage The flow rate of the variable oil pump is pr...

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Problems solved by technology

[0010] Among the above two methods, the first method has a simple structure and low cost, but the operation energy consumption of the primary variable oil pump is high; it is generally only used in low-end and medium-end vehicles; in the second method, although the operation energy consumption is low, However, the structure of the secondary variable oil pump is complicated and the cost is high, so it is generally only used in high-end cars

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