| CPC E02F 9/2296 (2013.01) [B60K 17/10 (2013.01); E02F 9/2228 (2013.01); F16H 61/0025 (2013.01)] | 20 Claims |
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1. A machine comprising
an electrical power source;
an electric powertrain configured for electrical power, the electric powertrain including an electrical motor in electrical communication with the electrical power source for converting electrical power to rotational motion, the electric powertrain further including a transmission having a transmission input operatively coupled to the electrical motor and a transmission output operatively coupled to a point of utilization, the transmission further including a plurality of engageable gears and one or more hydraulic gearshift actuators for selectively engaging the plurality of engageable gears;
a hydraulic system for directing hydraulic fluid to and from the one or more hydraulic gearshift actuators, the hydraulic system including a fluid reservoir accommodating hydraulic fluid, a hydraulic pump for pressuring and directing hydraulic fluid from the fluid reservoir to the one or more hydraulic gearshift actuators, and a pressure relief valve disposed between the hydraulic pump and the one or more hydraulic gearshift actuators;
a pump sensor operatively associated with the hydraulic pump to sense a sensed pump operation; and
an electronic controller operatively associated with the pressure relief valve and the pump sensor, the electronic controller programmed to regulate the pressure relief valve according to a pump function that relates electric current directed to the pressure relief valve when the sensed pump operation is below a pump threshold.
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