Control method and system for electronic pump used in transmission temperature protection

Abstract

The invention discloses a control method and system of an electronic pump for temperature protection of a transmission. Through the step of calculation and judgment of clutch heating power, the detection step of a transmission temperature field and the judgment step of an electronic pump high efficiency zone, the control method and system are used for selecting the best opportunity to rapidly decrease the temperature of a friction plate to the temperature before working of the friction plate after the friction plate is heated, it is ensured that the transmission temperature is controlled to bein the initial state before a driver moves a vehicle each time, accordingly, the transmission can cope with multiple times of repeated starting unhurriedly, and the problem of transmission cooling under the situation of urban congestion work is solved.

Description

technical field [0001] The invention relates to the technical field of automatic transmissions, in particular to a control method and system for electronic pumps used for transmission temperature protection in a multi-pump system. Background technique [0002] In a hydraulically driven automatic transmission, the use of an oil pump is essential. The oil pump provides a continuous and stable flow rate under the rated pressure to the hydraulic control unit to meet the hydraulic control requirements. In the market, multi-pump systems are increasingly becoming a trend due to increasingly stringent requirements on the economy of transmissions. In the previous single mechanical pump hydraulic scheme, since the speed of the mechanical pump is directly restricted by the engine speed, when the engine works so that the speed of the mechanical pump far exceeds the maximum required flow rate of the transmission, the power will be greatly wasted. Therefore, in the multi-pump scheme, at ...

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Problems solved by technology

[0003] The cooling efficiency of the transmission has always been a problem that has plagued the industry. The usual way to deal with it is to make the cooling request proportional to the value of the heating power of the clutch. The core point of this method is to use the cooling flow to fight against the heating power. The consideration is to When the friction plate of the clutch is heated, the heat is taken out. When the heating power is greater than the cooling power, the temperature inside the clutch rises rapidly. If the driver then brakes and enters the low engine speed area, the mechanical pump efficiency will decrease with the engine speed, resulting in The flow rate is low, the heat cannot be brought out quickly, and the driver cannot effectively cool the clutch before the next start

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