Abstract: A system and method for controlling adhesion of a wheel of an off-highway vehicle to a surface supporting the wheel measures a parameter of a traction motor of the off-highway vehicle driving the wheel. The parameter is analyzed to determine if wheel slip is present and the severity of the wheel slip. Some embodiments of the invention include adjusting a duty cycle of the traction motor as a function of the severity of the detected wheel slip.

Abstract: Operation of a second or additional engine is initiated based on throttle position, vehicle speed and output level of the operating engine or engines. A second or additional engine is stopped based on throttle position and operation of the first engine when the second or additional engine has been idling for a predetermined period of time. Idling of an engine is started or stopped based on various conditions of the vehicle, such as battery voltage, ambient air temperature, brake cylinder pressure, operator input, battery charging current, and direction input.

Abstract: Operation of a second or additional engine is initiated based on operating statistics. A second or additional engine is stopped based on operating statistics.

Abstract: A system and method for controlling adhesion of a wheel of an off-highway vehicle to a surface supporting the wheel measures a parameter of a traction motor of the off-highway vehicle driving the wheel. The parameter is analyzed to determine if wheel slip is present and the severity of the wheel slip. Some embodiments of the invention include adjusting a duty cycle of the traction motor as a function of the severity of the detected wheel slip.

Abstract: Operation of a second or additional engine is initiated based on throttle position, vehicle speed and output level of the operating engine or engines. A second or additional engine is stopped based on throttle position and operation of the first engine when the second or additional engine has been idling for a predetermined period of time. Idling of an engine is started or stopped based on various conditions of the vehicle, such as battery voltage, ambient air temperature, brake cylinder pressure, operator input, battery charging current, and direction input.