Control method for low-speed jitter of electric vehicle
A technology of electric vehicles and control methods, applied in electric vehicles, control drives, control devices, etc., to achieve the effects of no influence on basic performance, increased system cost, and easy implementation
Inactive Publication Date: 2018-09-28
TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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- Application Information
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Problems solved by technology
None of these methods solves the problem based on the essence of vehicle jitter, that is, the underdamped characteristics of the electric vehicle transmission system, and cannot fundamentally solve the low-speed jitter of electric vehicles.
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[0025] The main loop input power supply phase loss detection device of the servo drive provided by the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0026] Due to the underdamped characteristics of the electric vehicle transmission system, the motor speed fluctuates greatly at 50rpm-150rpm, such as around 100rpm, and the speed fluctuation frequency is about 5-6Hz. During the vehicle start-up acceleration process, when the motor passes through the natural frequency of the transmission system, the natural frequency of the transmission system is about 5-6 Hz, and resonance will occur at this time.
[0027] In the low-speed start state, the torque command of the vehicle controller is filtered by the accelerator pedal, and the vehicle controller (ECU) s...
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Abstract
The invention discloses a control method for low-speed jitter of an electric vehicle. The control method comprises the steps that (1) after proportional differential adjustment, the difference betweenthe motor speed and the vehicle speed is used as a compensation torque superimposed with a given torque of a vehicle controller to generate a target torque; (2) after a target torque command is smoothed by a wave trap, the target torque command is used as a motor torque execution command to eliminate low-speed jitter of the vehicle caused by the underdamping characteristic of a transmission system; and (3) the motor torque command is sent to a motor by a motor controller for execution. The control method for low-speed jitter of the electric vehicle is easy to implement without increasing system cost and has no effect on the basic performance of the vehicle.
Description
technical field [0001] The invention relates to an electric vehicle, and more specifically relates to a control method for the low-speed vibration problem of the electric vehicle. Background technique [0002] Compared with traditional vehicles, electric-driven new energy vehicles use motors as the drive system, with fast torque response and frequent switching of motor working states. The transmission system composed of motors, gearboxes and drive shafts is under-damped mainly due to inertia and elasticity. system. When the vehicle is operating at low speed, the transmission system will vibrate, which seriously affects the NVH of the vehicle. [0003] Most of the existing methods for suppressing jitter and noise adjust the motor torque step size or passivate the torque given. Impact on the vehicle transmission system. None of these methods solve the problem from the essence of vehicle vibration, that is, the underdamped characteristics of the electric vehicle transmission...
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Login to View More IPC IPC(8): B60L15/20
CPCB60L15/20B60L2240/423E01C9/008Y02T10/72
Inventor 黄雷
Owner TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE