Trim angle vibration control device for four-wheel drive passenger vehicle

Abstract

The invention relates to a trim angle vibration control device for a four-wheel drive passenger vehicle, and belongs to the technical field of automobiles. The control device comprises a front damper,a rear damper, a hydraulic oil cylinder, an electromagnetic reversing valve, an oil pump and a hydraulic oil tank, and a hydraulic control loop is formed. The damper is a magneto-rheological semi-active damper; the hydraulic oil cylinder is a double-piston-rod hydraulic oil cylinder; the outer ends of two piston rods of the hydraulic oil cylinder are fixedly connected with the outer ends of piston rods of the two dampers respectively; when in use, the control device is arranged between a front axle housing and a rear axle housing. The corresponding working current is applied by detecting therandomly changed longitudinal acceleration of the vehicle to obtain the proper damping force, so that the resultant moment of the front wheel and the rear wheel at the trim center is always in a balanced state when the vehicle runs at a variable speed, and the trim vibration phenomenon caused when the vehicle runs at the variable speed can be completely eliminated theoretically.

Description

technical field [0001] The invention belongs to the technical field of automobiles, and in particular relates to a pitch angle vibration control device for a four-wheel drive passenger car. [0002] technical background [0003] When the vehicle is running at variable speeds, the pitch angle of the vehicle will change with the change of the vehicle acceleration, which will cause the vibration of the pitch angle. Theoretical analysis of the brake pitch and drive back of a wheel-drive passenger car, we can know the brake pitch and drive back of the passenger car and the height of the center of mass, wheelbase, and braking force distribution of the passenger car coefficient and the position of the pitch center, when the center of mass height, wheelbase, braking force distribution coefficient and other parameters are selected, the suspension designer usually obtains the expected anti-braking pitch and anti-pitch by selecting the position of the pitch center. drive pitch. Howeve...

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Problems solved by technology

However, due to the influence of factors such as the suspension structure performance and the comfort of drivers and passengers, the above-mentioned invention has limited improvement capabilities, and cannot completely eliminate the pitch angle vibration phenomenon of the automobile.

Another anti-vehicle braking device including a frictional approaching separation force generating device uses friction to dissipate the energy of the vehicle's braking forward through thermal energy to weaken the phenomenon of vehicle braking nodding and achieve The control of the pitch angle vibration during braking improves the comfort of the vehicle, but this device has high requirements on the material performance of the friction generating device, and the high heat generated by friction will cause great damage to the friction material, and it cannot completely eliminate the friction of the vehicle. Braking nod phenomenon, that is, pitch angle vibration still exists

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