Construction Vehicle Slip Reduction via Variable Engine Speed Control

The patent applies dynamics by making the engine's maximum rotation speed variable rather than fixed. The control unit dynamically adjusts the maximum rotation speed of the engine based on the vehicle's current velocity, creating a velocity-dependent speed limit that mimics torque converter behavior. This dynamic adjustment allows the system to optimize traction force distribution across different velocity ranges, preventing peak traction force from occurring at low velocities where slipping is problematic.

The patent changes the parameter of engine maximum rotation speed as a function of vehicle velocity. By establishing a relationship where the maximum rotation speed decreases as vehicle velocity decreases (in the low-velocity range), the system transforms the vehicle velocity-traction force property to approximate that of a torque converter. This parameter change shifts the peak traction force to occur at higher velocities, reducing slipping on low-friction surfaces.

The control unit performs multiple functions: it controls vehicle velocity, controls traction force, and now also controls the maximum rotation speed of the engine based on vehicle velocity. By making the control unit multi-functional and integrating the slip reduction control logic into the existing control architecture, the patent avoids adding separate dedicated hardware systems while achieving the desired torque converter-like behavior.

The patent implements feedback by having the control unit continuously monitor vehicle velocity and use this information to adjust the maximum rotation speed of the engine. The vehicle velocity detection unit provides real-time velocity data to the control unit, which then dynamically sets appropriate speed limits. This closed-loop feedback mechanism enables the system to automatically adapt to changing operating conditions and maintain optimal traction characteristics without requiring complex open-loop control systems.