Agricultural Vehicle Traction Control via Automatic Wheel Engagement
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Solution Overview
Problem
Existing traction control systems for vehicles are limited to managing drive and deceleration torques, which can disrupt the driver's intended control and do not effectively address loss of traction by increasing the power transmission capability of driven wheels.
Innovation Solution
A method for traction control that automatically engages additional driven wheels by actuating a switching device when a loss of traction is detected, using a control unit to compare wheel speed information with reference values and activate the connection device to increase the number of driven wheels, thereby enhancing power transmission capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing traction control systems reduce drive torques or increase engine drag torque to prevent wheel spinning, then wheel spin is prevented, but the driver's intended control is disrupted
Solution Approach 1:
The system segments the wheel set into individually controllable units by equipping each wheel with its own brake actuator. This allows selective application of braking force to specific wheels experiencing spin, rather than applying torque reduction globally which would disrupt driver control. The control unit can target only the affected wheel while maintaining normal operation of other wheels.
Solution Approach 2:
The system introduces wheel speed sensors as intermediaries between the driver's control input and the brake system. These sensors continuously monitor wheel speed and provide feedback to the control unit, enabling the system to detect wheel spin conditions and apply corrective braking only when and where needed, preserving the driver's intended control while preventing unwanted wheel spin.
2Reliability
If traditional traction control methods are used, then wheel spin is reduced, but the power transmission capability of the vehicle is not substantially increased
Solution Approach 1:
The system performs preliminary detection of wheel spin conditions through continuous monitoring of wheel speeds by sensors on each wheel. When spin is detected, the control unit immediately activates the brake actuator on the affected wheel before the spin can significantly reduce power transmission capability. This preliminary action prevents the degradation of power transmission rather than merely responding after the fact.
Solution Approach 2:
The system dynamically changes the braking parameter (brake force) applied to individual wheels based on real-time wheel speed measurements. By adjusting the brake force parameter selectively on wheels experiencing spin, the system maintains optimal power transmission capability across all wheels while preventing spin on affected wheels, thereby substantially increasing overall power transmission capability.
Data Source
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AI summary
The invention relates to a method for traction control of driven wheels (32) of a multi-axle motor vehicle (30), wherein the driven wheels (32) are assigned to at least one axle (36) of the motor vehicle (30), wherein at least one further axle (35) of the motor vehicle (30) is assigned further wheels (31) which can be driven by actuating a switching device (33) and can be towed by releasing the switching device (33), wherein rotational speed information of the driven wheels (32) is acquired by a control unit (20) (4) and compared with a reference value (5), and wherein if an upper threshold deviation from the reference value is exceeded by the rotational speed information or if a lower threshold deviation from the reference value is not reached by the rotational speed information, the control unit (20) detects a loss of traction of the driven wheels (32) (7, 10).The method according to the invention is characterized in that the actuation of the switching device (33) is carried out automatically by the control unit (20) upon detection of a loss of traction of the driven wheels (32) (9, 12). The invention further relates to a corresponding control unit (20) and an agricultural machine (30).