Evaluation method and device for braking energy recovery rate
A braking energy and recovery rate technology, applied in the field of vehicles, can solve problems such as poor braking energy recovery rate accuracy
Active Publication Date: 2017-12-08
BEIJING ELECTRIC VEHICLE
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Problems solved by technology
[0004] For this reason, the first purpose of the present invention is to propose a method for evaluating the braking energy recovery rate, which is used to solve the problem of poor accuracy of the braking energy recovery rate in the prior art
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[0083] 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.
[0084] The method and device for evaluating the braking energy recovery rate according to the embodiments of the present invention will be described below with reference to the accompanying drawings.
[0085] figure 1 It is a schematic flowchart of a method for evaluating braking energy recovery provided by an embodiment of the present invention. Such as figure 1 As shown, the evaluation method of braking energy recovery includes the following steps:
[0086] S101. Obtain a preset time speedometer of the vehicle. The time spee...
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The invention provides an evaluation method and device for the braking energy recovery rate. The evaluation method comprises the steps that a preset time speedometer of a vehicle is obtained, and the time speedometer comprises each time point and the corresponding running speed; aiming at each time point, running resistance of the vehicle under the accelerating condition and running resistance of the vehicle under the decelerating condition are calculated according to the corresponding running speed of the time points; and combined with the maximum torque limiting value of a vehicle motor, the front-rear braking force distributing strategy under the decelerating condition and the corresponding running speed of the time point, driving power required to be output by the motor under the accelerating condition and braking power to be output by the motor under the decelerating condition are calculated, so that the braking energy recovery rate of the vehicle is calculated, the accuracy rating of the calculated braking energy recovery rate is improved, deviation between the braking energy recovery rate and the actual braking energy recovery rate is small, so that energy capacity of selected battery conforms to actual demand, and the performance of the electric vehicle is improved.
Description
technical field [0001] The invention relates to the technical field of vehicles, in particular to an evaluation method and device for braking energy recovery rate. Background technique [0002] At present, the mileage of an electric vehicle not only depends on the size of the battery energy on the vehicle, but also is affected by the braking energy recovery rate. For the same mileage requirement, the greater the braking energy recovery rate, the required battery energy will be smaller. In the existing technology, the designer mainly sets the braking energy recovery rate based on experience, and then calculates the energy required by the battery according to the braking energy recovery rate and the driving range requirements, and selects the battery. However, in the prior art, the accuracy of the artificial braking energy recovery rate is poor, and the deviation from the actual braking energy recovery rate is too large, resulting in the selected battery energy being too larg...
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IPC IPC(8): B60L7/10
Inventor 杨永涛岳凤来王义政
Owner BEIJING ELECTRIC VEHICLE