Method and device for automatically obtaining liquid filling ratio of hydraulic retarder
A hydraulic retarder and automatic acquisition technology, applied in the field of vehicles, can solve problems such as long constant speed, fluctuation, and inability to automatically adjust, so as to achieve the effect of improving life and ensuring stability
Active Publication Date: 2017-07-28
JILIN UNIV
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Problems solved by technology
The three technical problems all involve dynamically and automatically adjusting the liquid filling ratio in the working chamber of the retarder under the condition of variable speed
[0006] However, for the above key point 1: the output torque can only be adjusted manually, not automatically
For the above key point 2: Depending on the response of the valve body selected by the vehicle, the time step and the fluid filling rate of each step change will be different, but they will all produce the current vehicle speed u 2 at target speed u 1 The phenomenon of nearby fluctuations, and it is always in a state of continuous adjustment, the corresponding filling ratio cannot be locked, and due to the existence of iterations, the final constant speed time becomes very long, especially when the car is driving on a road with complex road conditions, the above The strategy makes it take longer for the vehicle to reach a constant speed
Method used
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[0048] 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 designate 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 and are intended to explain the present invention and should not be construed as limiting the present invention.
[0049] In addition, the terms "first" and "second" are used for descriptive purposes only, 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 these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.
[0050] In the present invention, unless otherwise clearly specified...
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The invention discloses a method and a device for automatically acquiring liquid filling ratio of a hydrodynamic retarder. The method comprises the following steps of establishing a driving force-running resistance equation; judging the working state of the hydrodynamic retarder; if the hydrodynamic retarder is in a control state at the initial stage of deceleration, acquiring the liquid filling ratio according to the equation and the maximum heat sink power; if the hydrodynamic retarder is in a control state at the later stage of deceleration, acquiring the liquid filling ratio according to the equation and the maximum braking power; if the hydrodynamic retarder is in a control state at the constant speed stage, acquiring the liquid filling ratio according to the equation, current liquid filling ratio and a value of slope. According to the method disclosed by the embodiment of the invention, under different working conditions of the hydrodynamic retarder, the liquid filling ratio in which the hydrodynamic retarder needs to be positioned currently is automatically output by extracting parameters of a complete vehicle, so automatic control and rapid liquid filling ratio positioning are realized, the stability of vehicle running is guaranteed, and the service life of a valve body is prolonged; the method is simple and convenient.
Description
technical field [0001] The invention relates to the technical field of vehicles, in particular to a method and device for automatically obtaining the filling ratio of a hydraulic retarder. Background technique [0002] When the vehicle is driving on a slope, the hydraulic retarder is used instead of the service brake, so as to automatically achieve the purpose of decelerating the vehicle to a constant speed. Specifically, the hydraulic retarder converts the kinetic energy of the vehicle into the internal energy of the working fluid of the hydraulic retarder, which is dissipated by the vehicle radiator. Among them, the torque of the hydraulic retarder is related to the current speed and the ratio of gas and liquid in the working chamber, and is limited by the current cooling power of the vehicle. [0003] The working conditions of the hydraulic retarder are divided into the following three stages: A. Initial deceleration control. In this process, the speed of the retarder i...
Claims
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IPC IPC(8): B60T10/00
CPCG06F30/367
Inventor 雷雨龙郑宏鹏宋鹏翔
Owner JILIN UNIV