A Design Calculation and Optimization Method of Electric Vehicle Powertrain Mounting System
A powertrain and suspension system technology, applied in design optimization/simulation, mechanical equipment, combustion engines, etc., can solve problems such as the influence of system vibration and bad vibration without considering it, shorten the research and development cycle, reduce research and development costs, Reasonable natural frequency distribution effect
Active Publication Date: 2022-07-26
SOUTH CHINA UNIV OF TECH
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[0004] In the Chinese authorized patent "A Design Optimization Method and Device for Powertrain Mounting System (CN102609551B)", the powertrain mounting system model constructed is a six-degree-of-freedom model, which does not take into account the current widely used in automobiles. The impact of the subframe on the vibration of the system, and only the inherent characteristics of the powertrain suspension system are analyzed and optimized, that is, only the static optimization is performed, and the transient conditions that frequently occur in electric vehicles are not analyzed. The disadvantage of this treatment is that it may make the inherent characteristics reach the optimization target, but there are still bad vibration problems in actual working conditions
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[0062] The present invention will be further described in detail below with reference to the accompanying drawings through an example.
[0063] The present embodiment provides a design calculation and optimization method for an electric vehicle powertrain suspension system, the steps are as follows:
[0064] (1) Establish as figure 2 The center of mass coordinate system shown in the mechanical model of the powertrain mount. The position of the center of mass of the powertrain is the coordinate origin O, and the fixed coordinate system O-XYZ is established with O as the origin. The Y axis is parallel to the axis of the motor output shaft, and the positive direction points to the free end of the motor output shaft. Axes are determined using the right-hand rule. Using the three-wire pendulum inertial parameter measurement test bench to measure the rotational inertia I of the powertrain to the X-axis, Y-axis and Z-axis respectively xx , I yy , I zz , obtain the inertia produ...
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The invention discloses a design calculation and optimization method for a powertrain suspension system of an electric vehicle, comprising the following steps: firstly, the method establishes a powertrain center of mass coordinate system, and on this basis, obtains powertrain inertia parameters, The position of the center of mass, the installation position of the rubber mount and the static stiffness curve and other parameters; the dynamic model of the powertrain mount system is further established, and the differential equation of motion is derived; the objective function is established according to the energy decoupling theory and transient response characteristics ;Select the highest energy decoupling rate of the mounting system, the smallest longitudinal acceleration of the powertrain center of mass and the minimum shock amplitude under transient response as the goal, and the stiffness of the linear segment of the mount as the design variable, the natural frequency is reasonably distributed and the range of the mount stiffness variation For the constraints, the multi-island genetic algorithm is used for optimization, and finally an example is used to verify the feasibility of the method.
Description
technical field [0001] The invention belongs to the optimization design neighborhood of a vehicle powertrain mounting system, and particularly relates to a design calculation and optimization method for an electric vehicle powertrain mounting system. Background technique [0002] As the main excitation source of the car, the powertrain generates vibrations that are transmitted to the subframe through the suspension system, and then to the body, thereby causing the body to vibrate. A suspension system with good performance can not only reduce the vibration transmitted from the powertrain to the frame, improve ride comfort, but also better extend the service life of the powertrain and other components, so the design of the suspension system changes. be particularly important. Different from traditional fuel vehicles, the electric vehicle drive motor has fast output response and large output torque. The output torque of the drive motor usually rises to several hundred Nm with...
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IPC IPC(8): G06F30/15G06F30/17G06F30/20G06F17/13G06F17/16G06F111/04G06F119/14
CPCG06F30/15G06F30/17G06F30/20G06F17/13G06F17/16G06F2111/04G06F2119/14Y02T10/40
Inventor 康英姿肖兵上官文斌
Owner SOUTH CHINA UNIV OF TECH