Variable Locking Differential for Commercial Vehicle Understeer
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Solution Overview
Problem
Commercial vehicles with hydraulic wheel motors experience traction issues due to varying friction conditions, leading to understeer and poor cornering behavior, as existing solutions like hydraulic differential locks rigidly connect wheels, restricting asynchronous speeds.
Innovation Solution
A drive system with a variable locking differential function that allows asynchronous speeds for wheels during cornering, using a hydraulic mass flow divider with an adjustable element to control hydraulic fluid distribution, enabling individual speed management for each wheel based on steering angle and vehicle data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydraulic differential lock rigidly connects wheels to achieve synchronous running, then traction compensation is improved, but cornering performance deteriorates due to inability to achieve asynchronous speeds
Solution Approach 1:
The patent applies the dynamics principle by making the differential lock controllable and variable rather than rigidly fixed. The differential lock can dynamically adjust its locking state based on driving conditions - fully locked during straight driving for traction compensation, and unlocked or partially locked during cornering to allow asynchronous wheel speeds, thus resolving the contradiction between traction compensation and cornering performance
Solution Approach 2:
The patent changes the parameter of differential lock engagement from a fixed state to a variable state. By controlling the locking differential function through a control unit that monitors wheel speeds and steering angle, the system adjusts the degree of wheel connection dynamically, enabling both synchronous operation for traction and asynchronous operation for cornering
2Reliability
If wheels are rigidly connected via differential lock, then traction is compensated, but understeer tendency increases due to restricted asynchronous speed capability
Solution Approach 1:
The system dynamically adjusts the differential lock engagement based on real-time driving conditions. During cornering, the control unit detects the steering angle and allows asynchronous wheel speeds by reducing lock engagement, thereby eliminating the understeer tendency while maintaining traction compensation during straight driving
Solution Approach 2:
The control unit continuously monitors wheel speeds and steering angle to determine the appropriate differential lock engagement level. This feedback mechanism enables the system to automatically reduce understeer tendency during cornering by allowing speed differences between wheels, while maintaining effective traction compensation during straight driving
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system reduces the tendency of commercial vehicles to understeer by allowing asynchronous wheel speeds, improving cornering performance without compromising traction compensation, thus enhancing maneuverability.
Implementation Method 1
using a hydraulic mass flow divider with an adjustable element to control hydraulic fluid distribution
Data Source
Figure 1A~1C
Figure 2
Figure 3
AI summary
The invention relates to a drive system (100) for a motor vehicle, preferably for reducing the understeer tendency of a motor vehicle and/or for enabling asynchronous rotational speeds for at least two wheels (1, 2) of the motor vehicle which are connected to each other via a locking differential function, comprising at least one first axle, which is preferably driveable via a drive train, at least one second axle, to which at least one preferably hydraulic motor (RM1, RM2) is assigned for driving at least two wheels (1, 2) of the motor vehicle, and a locking differential function for traction compensation for the at least two wheels (1, 2). The drive system (100) is characterized in particular by the fact that the locking differential function is variable in order to enable different rotational speeds for the at least two wheels (1, 2) during cornering of the motor vehicle. The invention also relates to a corresponding operating method.