Vehicle mixed suspension actuator and multi-mode coordinated switching control method thereof

Abstract

The invention discloses a vehicle mixed suspension actuator and a multi-mode coordinated switching control method thereof. The vehicle mixed suspension actuator comprises an actuator body and a control unit, the actuator body comprises a double-outlet rod type magneto-rheological damper, an upper linear motor unit and a lower linear motor unit, the upper linear motor unit is arranged on the upperportion of the double-outlet rod type magneto-rheological damper, and the lower linear motor unit is arranged on the inner lower portion of the double-outlet rod type magneto-rheological damper. The method includes the steps: firstly, acquiring date and synchronously transmitting the date; secondly, calculating ideal damping force of a vehicle suspension under LQG (linear quadratic Gaussian) control; thirdly, calculating a vehicle weighted acceleration root-mean-square value; fourthly, coordinating, switching and controlling an energy feeding mode, a semi-active control mode and a semi-activecontrol mode. The actuator is novel and reasonable in design, convenient to implement, popularize and use, low in cost, high in working stability and reliability, energy feeding and real-time capability and high in practicability, and the mixed suspension can be positioned in an optimal damping state.

Description

technical field [0001] The invention belongs to the technical field of vehicle suspension actuators, and in particular relates to a vehicle hybrid suspension actuator and a multi-mode coordinated switching control method thereof. Background technique [0002] When the vehicle is running, the vehicle vibrates due to the excitation of the unevenness of the road surface. At present, what is widely used in automobiles is to realize the functions of damping vibration and carrying the body through passive suspension (composed of shock absorbers, elastic elements, etc.). However, the performance parameters (stiffness and damping) of the passive suspension cannot be adjusted in real time according to the actual working conditions of the vehicle during driving. The frame converts the energy of the vibration of the car into heat energy and dissipates it in the air through the shock absorber and the elastic element, and it is not utilized. Due to the shortcomings of the passive suspe...

AI Technical Summary

Problems solved by technology

The active suspension can adjust the vibration damping performance of the suspension in real time according to the excitation of the unevenness of the road surface and the driving conditions of the vehicle, and the active suspension can adapt to all road excitations and vehicle driving conditions. However, the active suspension has high energy consumption. The shortcomings of its performance make its development prospects greatly restricted.

The advantage of the semi-active suspension is that it can provide a certain range of damping force for the suspension and can also recover energy. However, since the semi-active suspension can only change one parameter in the stiffness or damping of the suspension, the semi-active suspension There are disadvantages in the real-time adjustment of the frame, which cannot adapt to all road surfaces and vehicle driving conditions, which limits the further improvement of vehicle handling and ride comfort to a certain extent

[0003] Active suspension requires an additional energy source to provide the actuator to generate active force for vibration reduction, so active suspension consumes a lot of energy, which will seriously limit the promotion of active suspension in automobiles

Therefore, the energy feed of the active suspension actuator must be considered in the design of the active suspension, otherwise the popularization and application of the active suspension will be severely limited due to excessive energy consumption.

In addition to the high energy consumption of active suspension, there is another factor limiting its development and application, which is the failure of active suspension actuators

If the active suspension only uses actuators and springs, considering the failure of the actuators, the ride comfort and handling of the car will have a great impact

[0004] Active suspension single actuators include electromagnetic actuators, such as: linear motor type; electro-hydraulic actuators, such as: electrohydrostatic actuators; pneumatic types, such as: air spring actuators; The electro-hydraulic and pneumatic actuators are too large in size, which is not conducive to the installation of the vehicle suspension in practical applications. The electromagnetic actuator is small in size and high in efficiency, but if a single actuator fails, it will not be guaranteed at all. car ride comfort

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