Method to control differentials of multidrive wheeled vehicles

FIELD: mechanical engineering.

SUBSTANCE: invention relates to methods of control of differential locking of multidrive wheeled vehicles and it can be used at designing of systems to control tractive forces of driving wheels of multidrive vehicles and carrying out investigations of wheeled vehicles. proposed method of control of differential locks comes to locking of differential for definite periods of time at threshold values of mismatching of mechanical parameters of driving wheels intercoupled by said differential and unlocking differential at expiration of definite of time or at achievement of threshold value of steerability index. Unlocking of differentials at achievement of threshold value of steerability index is carried out individually, starting from differential whose locking has greater effect on steerability of wheeled vehicle.

EFFECT: enlarged range of control of traction forces on driving wheels to increase cross-country capacity and traction and speed properties at provision of required steerability of multidrive wheeled vehicles.

1 dwg

 

The invention relates to the field of engineering, in particular to methods lock control differential-drive wheeled vehicles. Can be used for designing control systems traction on the drive wheels-drive cars, as well as in research and testing of wheeled vehicles.

Known methods of operation control differentials, which consists in locking differentials when reaching mismatches kinematic parameters, in particular the frequency of rotation of the drive elements associated with these differentials wheels at certain intervals [Vantsevich CENTURIES, Vysotsky, MS, Gilles LG Mobile transport vehicles: Interaction with the environment. - Minsk: Belarusian Nauka, 1998. - 303 S.].

This method is implemented in the design of electronic distribution of tractive effort "Auto-lock" company "International" [Disel and Turbine Progress. New Axle Lock System and Front Driving Axle. 1979. 21 p.] management mode of operation of the center differential. It helps to eliminate slippage of individual bridges-drive wheeled vehicles in bad weather and adverse towing conditions and as a result increase their maneuverability and traction and speed properties.

The disadvantage of this method is that it ignores the effect of the lock and differentials on the handling of the car, which by the curvilinear movement of the machine can be significant. In the implementation of this method significantly affects handling and active safety of the machine in curvilinear motion.

The closest to the technical nature of the claimed solution is the method of controlling the differential wheeled vehicles, which consists in locking differentials for certain periods of time when the threshold mismatches kinematic parameters associated with these differentials wheels, unlocking differentials after certain intervals of their locks or unlocks all at the same time when the threshold values of controllability [Vantsevich CENTURIES, Vysotsky, MS, Zakrevsky ROAD Management differential-drive wheeled vehicles./ Research center of problems of mechanics of machines of the Academy of Sciences of Belarus. - Minsk, 1994. - 22 S.], adopted as a prototype.

This method of control allows to exclude differential slippage of individual axles and wheels-drive wheeled vehicles in bad weather and adverse towing conditions with the aim of increasing their permeability and traction-speed performance and to ensure a satisfactory controllability, characterized by a threshold value of its indicators of who I am.

The disadvantage of this method is the narrow operating range of the system of regulation traction, limited conditions ensuring satisfactory controllability multi drive wheel of the machine.

The present invention is to increase the operating range based on the control differential system, traction control efforts, eliminating slippage of individual axles and wheels in bad weather and adverse towing conditions to improve patency and traction-speed performance and providing the desired controllability wheel-drive cars.

The solution of this problem is achieved in a method of controlling a locking differential-drive wheeled vehicles, which consists in locking differentials for certain periods of time when the threshold mismatches kinematic parameters associated with them wheels and unlocking differentials after certain periods of time or when the threshold values of controllability, and according to the technical solution unlocking differentials when the threshold values of the controllability carried out individually, starting with the differential lock which provides abolishes influence on the control wheel of the machine.

The inventive method allows to extend the operating range of the system, traction control efforts that are based on management differentials due to unblock individual differential lock which has the greatest effect on the handling of the car, when the threshold values of the control and management differential lock which has a negligible impact on handling.

The drawing shows a graphical relationship between the controllability of Svmachine MZKT-79091 turning angle of the inner wheel of the first axle when possible status options, inter-axle differentials.

An example implementation of the method. The inventive method was estimated by the calculation method as algorithmic support system regulation traction multi drive wheel vehicle MZKT-79091 with the wheel formula 8×8, built on the management of inter-axle differentials front and rear of the truck and megalogenis differential.

The effect of the method is illustrated by the graphical dependency measure the controllability of the machine MZKT-79091 turning angle of the inner wheel of the first axle when possible status options, inter-axle differentials, shown in the drawing. Curve option 1 in the drawing corresponds to the case when all the different the Aly machine unlocked, curve option 2 - locked differentials in the front and the back of the truck, option 3 is locked differentials in the front and the back of the truck in gear.

As a measure of controllability used the following indicators:

where Sv- indicator manageability-wheeled vehicles [Vantsevich CENTURIES, Vysotsky M. R., Dubovik D.A. Regulation of power in the propulsion as a means of managing the dynamics of wheeled vehicles // Automotive. - 2004. No. 1. - S-16];

Knthe curvature of the trajectory of movement of the machine in neutral turnability, m-1;

Torthe curvature of the actual trajectory when moving the machine, m-1.

From the drawing it appears that when the threshold values of the controllability of the extreme (maximum values) figure manageability while blocking all managed differentials (front and rear trolleys and transfer case), equal to 0.85, the operating range of the system of regulation traction effort, based on the way management differentials, taken as a prototype, will be ±7 degrees of rotation of the inner wheel of the first axle.

When building a system of regulation traction effort on the basis of the proposed method reaches the controllability of a service provider, equal to 0.85, unlocks only the differential in the transfer case, and differentials in the front and the back of the truck remain in a locked state. In accordance with the current operating conditions of the machine will be managed by the differentials in the front and the back of the truck. The working range of the system, traction control efforts, providing the desired handling of the car will be ±31 the degree of rotation of the inner wheel of the first axle.

Therefore, when implementing the proposed method of control the differential-drive wheeled vehicles operating range of the system of regulation of traction force will increase by 24 degrees in the left and right turning machine.

Thus, the inventive method of control locking differentials can significantly extend the operating range of the control systems traction on the drive wheels for improved maneuverability, and traction-speed performance while ensuring the required controllability wheel-drive cars.

The method of controlling the locking of the differential-drive wheeled vehicles, which consists in locking differentials for certain periods of time when the threshold mismatches kinematic parameters associated with them wheels and unlock the programming differentials after certain periods of time or when the threshold values of controllability, characterized in that the unlocking differentials when the threshold values of the controllability carried out individually, starting with differential lock, which has the greatest effect on the control wheel of the machine.



 

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