A dual-pump oil supply system for an automatic transmission and its working method

Abstract

The invention discloses a dual-pump oil supply system for an automatic gearbox and a working method thereof. A mechanical oil pump and an electronic oil pump are arranged, the mechanical oil pump is driven by an engine, the electronic oil pump is used as an auxiliary pump, and the mechanical oil pump and the electronic oil pump work together to provide sufficient pressure oil for a main oil circuit; and then a main oil circuit pressure control magnetic valve and a main pressure slide valve are arranged, and oil pressure is adjusted to stabilize the oil pressure of the main oil circuit and a cooling lubricant oil circuit. When the engine is stopped, the mechanical oil pump cannot provide pressure oil, and the electronic oil pump can provide the pressure oil, so as to achieve the requirements of the automatic gearbox for pre-coupling of gears and a clutch; when the engine is idling, the mechanical oil pump provides insufficient hydraulic pressure, and the electronic oil pump works to supplement the pressure oil of an automatic gearbox hydraulic system; and under the condition of satisfying the demand of the hydraulic system, the displacement of the mechanical oil pump is reduced, sothat under the high-speed operating condition of the engine, the power consumption of the oil pumps is reduced, and the transmission efficiency of the automatic gearbox is improved.

Description

technical field [0001] The invention relates to the technical field of transmission oil supply systems, in particular to a dual-pump oil supply system of an automatic transmission and a working method thereof. Background technique [0002] At present, various OEMs respond to increasingly serious environmental problems and stringent emission regulations by improving transmission efficiency of transmissions. In automatic transmissions, the hydraulic oil supply system is an important part. The design of the oil supply system It directly affects the efficiency of the gearbox. [0003] The existing automatic transmission generally supplies oil to the hydraulic system through a mechanical oil pump, and the mechanical oil pump is driven by an engine. Because the mechanical oil pump is driven by the engine, its oil supply is related to the engine speed. In order to meet the oil supply demand of the automatic transmission under the condition of low engine speed, the displacement of...

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Problems solved by technology

In order to meet the oil supply demand of the automatic transmission under the condition of low engine speed, the displacement of the mechanical oil pump needs to be designed larger, which will lead to a surplus of displacement of the mechanical oil pump when the engine is high In addition to meeting the needs of cooling and lubrication and driving the actuator, the excess oil will flow back to the oil pan, which will cause the loss of transmission efficiency of the automatic transmission, resulting in an increase in fuel consumption of the vehicle

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