Prime mover control device for work vehicle

A prime mover control device for a work vehicle, comprising:

• a controller that controls a rotation speed of a prime mover in correspondence to an operation quantity at an accelerator operation member;
• an oil temperature sensor that detects a temperature of cooling oil used to cool a brake;
• and
• a load calculation unit that calculates a traveling load based on a rotation speed at an input shaft of a torque converter and a rotation speed at an output shaft of the torque converter;
• wherein the controller is programmed to limit a maximum rotation speed of the prime mover when the temperature of the cooling oil detected by the oil temperature sensor is higher than a predetermined temperature, compared to when the temperature of the cooling oil detected by the oil temperature sensor is lower than the predetermined temperature, and
• wherein the controller is programmed not to limit the maximum rotation speed of the prime mover even when the temperature of the cooling oil detected by the oil temperature sensor is higher than the predetermined temperature if the traveling load detected by the load calculation unit is lower than a predetermined load.

A prime mover control device for a work vehicle, comprising:

• a controller that controls a rotation speed of a prime mover in correspondence to an operation quantity at an accelerator operation member;
• and
• an oil temperature sensor that detects a temperature of cooling oil used to cool a brake;
• wherein the controller includes a speed stage detection unit that detects a speed stage setting at a transmission,
• wherein the controller is programmed to limit a maximum rotation speed of the prime mover when the temperature of the cooling oil detected by the oil temperature sensor is higher than a predetermined temperature, compared to when the temperature of the cooling oil detected by the oil temperature sensor is lower than the predetermined temperature, and
• wherein the controller is programmed not to limit the maximum rotation speed of the prime mover even when the temperature of the cooling oil detected by the oil temperature sensor is higher than the predetermined temperature if the speed stage setting detected by the speed stage detection unit is lower than a predetermined speed stage.