Speed changing box lubricating method and system suitable for hybrid electric vehicle
A hybrid vehicle and gearbox technology, applied in the direction of gear lubrication/cooling, etc., can solve the problems of insufficient given large load, increased system weight, and excessive given of small load, so as to avoid insufficient given of large load and improve lubrication. Efficiency, the effect of avoiding mutual interference
Active Publication Date: 2016-07-27
BYD CO LTD
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Problems solved by technology
In the transmission of a heavy hybrid electric vehicle, if a mechanical pump fixedly connected to the output shaft of the engine is used alone, the engine will not start in the EV mode (pure electric mode) of the vehicle, and there is no power source for the flow of lubricating oil. If the electric drive oil pump is used alone , you need to choose a larger motor, which greatly increases the weight of the system
[0003] Moreover, in the above-mentioned oil injection lubrication method, the electric drive oil pump drives the oil injection lubrication system lacks the monitoring of the system state, because the load of the lubrication system changes with the viscosity of the lubricating oil, and the viscosity of the lubricating oil changes with the temperature, the motor Due to the lack of system status feedback, the controller cannot judge the load condition of the motor and drives the motor with a constant reference, resulting in insufficient large load reference and excessive small load reference, which increases the useless power consumption of the system
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[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0029] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of said features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.
[0030] In the desc...
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The invention discloses a speed changing box lubricating method suitable for a hybrid electric vehicle. The vehicle comprises an electric pump and a mechanical pump. Work modes of the vehicle include an EV mode and a hybrid electric vehicle mode. The method comprises the following steps that S11, a controller judges the work mode of the vehicle; S12, in the EV mode, the controller controls the electric pump to lubricate a speed changing box with different power values according to the temperature of lubricating oil; and S13, in the hybrid power mode, the controller shuts down the electric pump, and the mechanical pump is started along with an engine and starts to lubricate the speed changing box. According to the above speed changing box lubricating method, the electric pump or the mechanical arm is started to work according to the mode of the vehicle, and the work of the electric pump and the mechanical pump is divided according to different modes. Meanwhile, by means of the above method, the rotating speed of the electric pump is controlled according to the temperature of the lubricating oil, and accordingly the lubricating efficiency is improved. The invention further discloses a speed changing box lubricating system.
Description
technical field [0001] The invention relates to automobile technology, in particular to a gearbox lubrication method and a gearbox lubrication system suitable for hybrid electric vehicles. Background technique [0002] At present, the method of oil injection lubrication is mainly used in new energy vehicles, including pure electric vehicles and hybrid vehicles, using a mechanical pump connected to the output shaft of the engine or an electric pump independent of the transmission system as the power source. In the transmission of a heavy hybrid electric vehicle, if a mechanical pump fixedly connected to the output shaft of the engine is used alone, the engine will not start in the EV mode (pure electric mode) of the vehicle, and there is no power source for the flow of lubricating oil. If the electric drive oil pump is used alone , you need to choose a larger motor, which greatly increases the weight of the system. [0003] Moreover, in the above-mentioned oil injection lubr...
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Inventor 阮鸥陈昊王品李玲玲黄鹏
Owner BYD CO LTD